CA2176490A1 - Portable hand-held power injector - Google Patents
Portable hand-held power injectorInfo
- Publication number
- CA2176490A1 CA2176490A1 CA002176490A CA2176490A CA2176490A1 CA 2176490 A1 CA2176490 A1 CA 2176490A1 CA 002176490 A CA002176490 A CA 002176490A CA 2176490 A CA2176490 A CA 2176490A CA 2176490 A1 CA2176490 A1 CA 2176490A1
- Authority
- CA
- Canada
- Prior art keywords
- syringe
- casing
- lead screw
- hand
- power injector
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/178—Syringes
- A61M5/20—Automatic syringes, e.g. with automatically actuated piston rod, with automatic needle injection, filling automatically
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M2205/00—General characteristics of the apparatus
- A61M2205/60—General characteristics of the apparatus with identification means
- A61M2205/6036—General characteristics of the apparatus with identification means characterised by physical shape, e.g. array of activating switches
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
- A61M5/142—Pressure infusion, e.g. using pumps
- A61M5/145—Pressure infusion, e.g. using pumps using pressurised reservoirs, e.g. pressurised by means of pistons
- A61M5/1452—Pressure infusion, e.g. using pumps using pressurised reservoirs, e.g. pressurised by means of pistons pressurised by means of pistons
- A61M5/14546—Front-loading type injectors
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
- A61M5/142—Pressure infusion, e.g. using pumps
- A61M5/145—Pressure infusion, e.g. using pumps using pressurised reservoirs, e.g. pressurised by means of pistons
- A61M5/1452—Pressure infusion, e.g. using pumps using pressurised reservoirs, e.g. pressurised by means of pistons pressurised by means of pistons
- A61M5/14566—Pressure infusion, e.g. using pumps using pressurised reservoirs, e.g. pressurised by means of pistons pressurised by means of pistons with a replaceable reservoir for receiving a piston rod of the pump
Abstract
A hand-held power injector (60) is provided for injecting liquid, such as contrast media, into the vascular system of a mammal. The device comprises a pistol-shaped housing which encloses a battery-powered D.C. motor for constant-rate delivery of liquid from a syringe (80). The hand-held power injector includes an engagement feature connecting the syringe (80) and the power injector which prevents inadvertent activation of the power injector. The engagement feature comprises a flange (92) on the syringe arranged to engage in a slot (72) of the casing and to operate a syringe sensing switch (124), thereby permitting power assisted injection to be commenced by a user.
Description
2~ 76490 : -62012/047 . 580 PORTA3LE ~AND-~ELD POWER INJECTOR
This invention relates to a hand-held controllable -power injector as applied to syringes adopted to deliver a liquid into a patient . Such inj ectors are used ~or example to deliver, by injection, X-ray contrast media into a patient prior to or during urographic or angiographic procedures.
Urography is a radiological technique wherein at least a part of the urinary tract of a mammal is rendered opaque by intravenous inj ection o~ a contrast medium or by inj ection into the bladder through the urethra.
Angiography is also a radiological technique wherein the arteries or Yeins of a mammal are rll1tl;n~
by inj ecting a radiographic medium.
In both to~-hn; qll~c the coated vascular structures are radiographically imaged ~or diagnostic purposes.
For delivery to the de3ired site, the contrast medium is placed in an appropriate syringe and ~orced through a hollow needle or a catheter in such a manner that the contrast medium enters the blood stream or the bladder at the appropriate time and place ~or taking r~-l; q~r~rh; c images . As contrast medium is being injected to the site to be v; c-l~l; 70d through the hollow needle or a catheter, high pressures are of ten ~nt olln~ l, sometimes as high as 1, ooo p5i (6.9 MPa) .
This requires a rather high force to be exerted on the pi~ton in order to deliver the content o~ the syringe.
Furf-hl _d, such ~orce is to be exerted in a constant ~~
manner for ~ n~;n--~us and even volume delivery o~ the contrast medium. Early injection systems were designed for manual injection o~ the contrast medium by means o~
a hand-held glass syringe. A mechanical injection system activated by a foot switch has also been, and is )0 W0 95/13841 ;~ 1 7 ~ ~ 7 ~
o still being, used for most general radiographic procedures. However, this system was only rarely used for coronary angiography for the probable reason that nr~r~tnr control is greatly reduced and the risk of 5 coronary artery dissection; nnr~R~cl Power inj ectors in general have certain advantages over hand-op~r~t~rl injectors inr11lAin~ the following They reduce reliance on an assistant ~n~hl in~ the op~ratnr to be in ,~ _ lete control of the injection of lO the contrast medium, they can deliver a precise volume, and the ~Lt~DuL~ nrr~tF~l can be limited by pr~R~t a P1~:DI~ULI: limit.
Power injectors are of three types: hydraulic, rnl ti r and P1 ectr; r . Hydraulic injectors have an 15 ~1 ectri r motor rnnnrrted to a hydraulic pump, which drives a ram.. rnnn~rt~l to a syringe that rnnt~inR the contrast medium- In 1 t i c inj ectors, the source of power is - _ e~Ded gas supplied by a tank or I:D~OL ~lPrtr;r injector8 are powered by ~ ctrir 20 motors in which a tr~nPmi R~inn means serves to change circular motion into linear motion which then drives a ram While typical power injectors ~1 ;m;n~t~ the physical effort required with manual injectors, they are 25 not easy to use, are expensive and the perception of instAnt Inl~nl-~ control present with manual injectors is lost because the syringe and controls for the injectors are not hand-held or not conveniently h~n~ hl ~ during the injection proces6. For example, a gas power-30 injector hand-held syringe does rl ;m;n~te the physical ef f ort associated with manual inj ection and also provides a perceived inst~nt~n~o~lR control of the injection, however, it reSIuires a gas system to power the syringe, such as pLtD~uLized carbon dioxide gas.
35 The gas delivery system includes a carbon dioxide gas tank with various indicators and controls, which reduces the portability of the device, it requires valuable , 21 764q~
-- 3 -- .
3pace in the proximity of the injection, it add3 to the complexity of using the device for the; nt~n~l~tl purpose and requires periodic replacement of the gas tank.
~3attery powered injectors are al30 available for ----5 use in angiography and urography employing a syringe for holding a contrast medium and a plunger connected to a -h~n; ~1 mean3 to automatically deliver the contrast medium. Some of these injectors include microprocessor technology for p~y~ ;n~ rates and time delivery and 10 have visual or audio display for ease o controlling the injection process. As these injectors become more sophisticated, the cost of making and using them increases and the complexity of use tends to increase the c,~ u~ities for breakdown.
The present invention is directed to a hand-held, light-weight power inj ector which eliminates the physical effort required with manual injectors but otherwise allows the practitioner complete human control of the inj ection proces3 .
2~ Viewed from one a3pect the invention provide3 a hand-held power inj ector for deliverirLg liquid media to a patient, comprising a casing, a syringe having a slideable piston therein and being removably coupIed to said ca3ing, drive mean3 in 3aid casing for driving the piston in said syringe to deliver said liquid to the patient, a manually operable switch for ;~-t1l~tln~ said drive means, and a 3yringe sen3ing 3witch for permitting actuation of said drive means only when said syringe is coupled to said casing, the casing having a slot and the 3 o syringe having a f lange arranged to be received in the -slot, a protrusion on the ca3ing F~n~ ;n~ in a rece33 in the flange when the syringe i3 coupled to the ca3ing, and wherein the syringe 3en3ing 3witch is located adj acent to said slot .
There is thus provided an; ~ ,v~ in the coupling of the syringe to the ca3ing of the hand-held power in~ector which i3 de3iy-ned to prevent unintended AMEND~D SHEEr 21 7~49~
.
activation of the power in~ ector .
The syringe sensing switch will normally only detect the syringe when the f lange is properly engaged ~ =
in the slot. En~ay. t of the protrusion in the recess 5 can ensure correct positioning of the syringe during coupling. Preferably the recess is deined between two tab portions of the f lange and the syringe sensing switch is arrânged to be engaged by one of said tab portion~ when the syringe is coupled to the casing.
Viewed from another aspect the invention provides â
hand-held power injector comprising a pistol-shaped casing, a syringe, and recharging means.
A preferred embodiment of the power injector is designed to be hand-held by one hand, light weight, 15 inexpensive and to allow complete control over the process of delivering râdiopâque media to the patient by the medical practitioner. To that end, its conf iguration resembles a pistol the handle portion of which provides for firm hold. The manually operable 20 switch, having forward, reverse and neutral po3itions, is pref erably located in the handle portion to be controlled by the index finger of the practitioner.
While the preferred device doe3 not incorporate complicated and expensive electronic components which 25 tend to breâk down and are c~~e,r~, - to use, it provides electrical energy to deliver the contrast media to the patient at a constant rate of delivery by driving a piston âlong the syringe barrel. The device preferably incorporates limit switches to automatically stop an electric motor when a lead screw, which engages the piston, is in its initial or completel position.
The ca3ing is advantageously made of light but tough plastic material and gafely houseg all ~ n~nt therein which may include:
AMENDED SHEET
W0 95113841 2 1 7 6 4 9 ~ C
.
a D . C . motor to provide angular motion;
rechargeahle batteries to supply electrical power 6 to the motor;
recharging means for the batteries;
a lead screw having a f emale ~ J~ means to engage a piston;
gear means to tr~n~lAt~ angular motion produced by the motor to linear motion of the lead screw;
limit switches to stop the motor when lead screw is in its initial or c ~l~t~ly ~tf~nrlpcl pns;tinnc;
and trigger switch with ~l~rtric;~l leads to h~ttPr;F.
and to the motor for controlling the, v. of the lead screw.
The syringe used may be of various sizes, such as from lO ml to 50 ml to 100 ml or larger, APr~onrl;n~ on the volume requirement of the patient and the type and rnnrf~ntt-;lt;nn Of the r~l;nrlrlll~ or other media. The syringe may have a luer cnnn~ctnr at one end to engage a r~th~t~r or a b~ltt~rfly needle which is to be inserted in the inj ection site . The other end of the syringe i6 preferably equipped with a flange to engage a receiving slot in the front end of the casing of the hand-held power inj ector . The syringe barrel holds a ~ hle piston or plunger therein and is preferably f~ ;rp~l with a male ~ means to mate with f emale . means of the lead screw.
The recharging means may consist of a recharger unit ~'I'l;rr'"l with two plugs one of which is inserted into the receptacle on the power injector and the other into a standard ~l~ctr;rll outlet.
Viewed from a further aspect the invention provides a hand-held power inj ector f or delivering liquid media to a patient I , q;n~
a pistol-shaped casing to provide for ease of h~n~ll ;n~, said casing comprising a main tl~hular body portion having a distal end and a proximal end and a wo 95/13841 2 ~ ~ ~ q 9 ~
handle portion integral therewith at the proximal end thereof to house and support r~ nnPnt parts therein;
a syringe removably coupled to said distal end of said main tubular body portion of said pistol-shaped 5 casing; and a trigger switch in said handle portion of said pistol-shaped casing; said pistol-shaped casing rnntAining drive means which comprises:
a battery-powered motor to ~PnPrAtP angular rotation;
a lead screw rotatably coupled with said motor by gear means to convert angular rotation to linear motion, said lead screw having at one end thereof a female rol~rl;n~ means;
a first limit switch rnnnPCtPrl to said lead screw and said motor to Al~t~ ~;rAlly disengage said motor and prevent further forward driving of the lead screw when the lead screw is at its ~ , ~ etPl y Pl~tpnrlpcl position;
a second limit switch cnnnPrtP~l to said lead screw and motor to Allt~ tirAlly disengage said motor and to ZO prevent ~urther reverse driving of the lead screw when the lead screw is at its initial position;
wherein said syringe ~ ~P~:
a syringe barrel having a luer rnnnPctnr at one end thereof for receiving a C~thPtPr and a flange at the other end thereof for drop-load Pn~;n~ said tubular body portion of gaid ca8ing and a pi8ton Rl ;~lPAhly positioned in said syringe barrel having a male rollrl;
means to engage said f emale rmlrl i n~ means of said lead screw;
said trigger switch rnnnPrtPrl to said motor and said battery having forward, reverse and o~ positions to control r v, of said lead screw coupled to said piston to inject liquid media into a patient;
and wherein the i ~ . v~ comprises:
a female engagement means at the distal end of said main tubular body portion of the pistol-shaped casing, said female engagement means having a semi-circular .
shape and comprising an engagement ælot and a protrusion;
a syringe loading activation switch adj acent with said slot and said ~.oLLu~ion in said fesle ~d~
means, said syringe activation switch to be activated when said syringe is engaged with said tubular body portion o~ the pistol-shaped casing;
a male ,~ means at one end of the syringe to engage said f egle ~on~3 ' means, said male engagement means having a generally oval shape and ~ a flange, said flange having at least one v-shaped recegs therein defined by tabs; and wiring cnnn~ct;r~ said syringe activation switch with said trigger switch, said syringe activation switch, when activated, ~ etf~ the elecerical circuit between said trigger switch C~ nn~ct-~l to said motor and battery so that the pressing of the trigger switch controls the, .~ L of said lead screw to said piston to inject liguid media into a patient.
Certain hand-held power injectors will now be described by way of example and with reference to the ::lCf, ying drawings, in which:-FIG. l is a perspective view of a hand-held power injector, a syringe engaged with said power iniector, butt.o~fly needle in place and battery charger unit;
FIG 2 . is a Eecti ~,nAl view of the hand-held power inj ector;
FIG. 3 is a cross-sPrt;rn~l view o~ the hand-held power injector taken along the line 3-3 of FIG. 2, 3 0 showing the syringe engaged and the syringe piston in its ~ c.y position;
FIG. 4 is a cross-sectional view of the hand-held power injector, showing syringe piston in its ~ t~n~
position, taken along line 3-3 of FIG. 2;
FIG 5 is a transverse cross-sertir~n~l view of the hand-held power ir,jector and syringe engaged therewith, WO 95113841 2 1 7 ~ ~ q ~ ~' , ? 1^
,~
taken along line 5-5 of FIG. 2;
FIG. 6 is a partial transverse crosæ-sectinnZll view of the hand-held injector taken along line 5-5 of FIG.
2;
FIG. 7 is a cross-se~ti nn~l view of the hand-held power inj ector taken along the line 7 - 7 of FIG . 2;
FIG. 8 is a cross-sectional view of the hand-held power inj ector taken along the line 8 - 8 of FIG . 2; and FIG 9 i5 a perspective view of the syringe not engaged with the power injector.
FIG 10 is a p~r~tive view of a hand-held power inj ector having a f emale e:l~y~y. means to receive a syringe;
FIG. 11 is a p~ ive view of a syringe having male ~ycly. means for connection to the hand-held power inj ector;
FIG. 12 is a perspective view of the hand-held power injector with the syringe engaged;
FIG. 13 is a side elevational view of the hand-held power injector shown in FIG. 10;
FIG. 14 is a side elevational view of the hand-held power inj ector with the syringe engaged shown in FIG .
12;
FIG. 15 is a crosa-sect; nn~l view of the t~
means of the hand-held power injector taken along the line A-A of FIG . 13 i FIG. 16 is a cross-sert;nn~l view of the ~iydy.
means of the hand-held power inj ector and the ~yay.
means of the syringe taken along the line B-B of FIG.
14; and FIG. 17 is an electrical circuit diagram which serves to activate and deactivate the power inj ector .
R~ff~r~ing to FIG. 1, power injector 10 i8 shown with syringe 12 Pn~ging gaid device, butterfly needle 13 Att~-~h~rl to said syringe by luer ~nnn~ctn~ 50 and battery recharger 14 is ready to engage power inj ector 10 by insertion of plug 44 into receptacle 42.
W095/13841 }~ . b' :C
~176~
.
g When assembled toyether, power injector 10 and syringe 12, along with handle 18 and trigger 20a-20b, l~E. ' lP a pistol. This configuration provides for firm hold control and convenient handle ability. The power inj ector 10 comprises a casing which serves as a housing and chassis for the r ,~n~nts~ cnnt~;n~ therein.
Referring to syringe 12, as shown in FIGS. 1, 2, 3 and 9, it, , s~ a syringe barrel to receive an injectable agent therein, said syringe barrel having a luer ~ ~nn~ct~r 50 at one end thereof serving as means for attaching b~ltt~rfly needle 13 thereto, and the other end of said tubular body having male co~rl;n~ 46 to engage female ro~lrl ;n~ 38. Flange 52 of syringe 12 locates and fixes syringe within a ~ ~ l; Ary slot (not shown) in front 16 of the power injector 10.
Loading of syringe 12 is exceptionally easy and practical, since the syringe is drop-loaded onto said slot without the need of any twisting or turning motion.
Positioned in said syringe barrel in a sl; ~l~Ahle rPlA~;~ln~hir is pi8ton 48 integral with male col~rli 46 .
As best seen in FIGS. 2, 3, 7 and 8, the casing or housing of the power injector 10 houses a D.C. motor 22 which produces angular rotation of gear 24. Gear 24 drives gear 26 which has int~rnAl thread 28. Linear v. of lead screw 30 is produced by preventing its rotation and by the angular rotation of ;ntF-rnAl thread 28. A follower 32, fixed to the back end of lead screw 30, prevents rotation of the lead screw during linear ~ by the, _ _ ~ of peg 32a of the fnl 1. ~_L 32 rolling or sliding in slot 32b.
D . C . motor 22 is powered by rechargeable batteries 40, which are located in handle 18 of power injector 10.
Trigger switch 20a-20b enga~eably coupled to hAtt~
3~ 40 and D.C. motor 22 has three positions: forward drive, reverse drive and o~f position. Forward limit switch 36 is positioned so that lead screw follower 32 triggers WO95~13W1 2 1 764~0 ~ o the switch and stops the motor when piston 48 is in its ~YtPnt9~ pnS; ti nn a8 shown in FIG 4 . Likewise, the backwards limit switch 34 is positioned so that the lead screw follower 32 triggers the switch and stops the motor 22 when pi8ton 48 is in its engagement pnfi;t;rn as shown in FIG 3 The power inj ector 10 is recharged by plugging recharger 14 in a standard electrical outlet and inserting plug 44 into receptacle 42 during periods in which the device is not in use.
Reference is now made to the r,pl~rAt; nn of the hand-held power inj ector . The syringe 12 could be pref illed with an injectable liquid, such as contrast media, or the power injector 10 could be used to fill the syringe.
If not prefilled, the empty syringe 12 is loaded onto the front 16 of the device, having male rn -r~ ;n~ 46 engage female couple 38, then placing the power injector 10 in an upright position by placing it with is ~lat surface 9 on top of a flat object, such as a table. The syringe 12 is then filled with contrast media by first driving the piston 48 to its ~YtPnrl~fl position within the syringe as shown in FIG. 4 A plastic tube (not shown) is At~Arh~ to luer rnnn-~ctnr 50 and the contrast media is ~y~llu.led into the syringe 12 by placing the opposite end of the plastic tube in a rnntA;n-or filled with contrast media and retracting piston 48 back into its ~llycLy pos; t; nn . Upon completion of the process the plastic tube is removed from the luer rnnnPctor 50 and a butterf ly needle 13 is attached thereto Af ter butter~ly needle 13 is AttArh~ to luer rnnn~rtor 50, the upright position of power injector 10 is ~-;ntA;n~.rl until the air from syringe 12 and b~t,orfly needle 13 is purged by driving piston 48 in the forward direction.
To drive piston 48 _orward or in reverse trigger switch 20a-20b is provided. Trigger switch 20a-20b is positioned in handle 18 of the power injector 10 to control both the _orward and reverse motion of the WO 9S/13841 2 ~
piston: pressing 20b results in forward motion o~ piston 48, while pressing 20a re6ults in reverse motion thereof. When neither 20a nor 20b trigger switch is pressed, switch ;Illt( t;n~lly reverts to neutral or of 5 position and motor 22 becomes ~ n~ed.
In the case when the syringe 12 is prefilled with contrast media, the syringe is loaded in the same manner as above-described, then the power inj ector 10 i8 positioned in an upright position. Syringe cap (not 10 shown) is removed from luer cnnn-~ct~r 50 and ~ltt~rfly needle 13 is ;~ttFInh~ to luer onn~ctnr 50 The air i8 then purged from the syringe as above-described.
Upon purging the air f r syringe 12, the power inj ector 10 is held by the medical practitioner at 15 handle 18 with index finger resting on trigger switch 20a-20b which is in the off poR;t;nn~ Protective sheath (not shown) is removed from butterfly needle 13 and the same is inserted into the injection sight on the patient. The pract;t;nn~r then activates motor 22 by 20 pressing trigger switch 20b which Plf~Ctr;t~lly engages ~ ttF'ri ~-2 40 with motor 22 . Motor 22 produces angular motion which is converted into linear motion through gears 24 and 26 acting on lead screw 30. Lead screw 30 drives piston 48 in the barrel of syringe 12 forcing 25 contrast media t_rough butterf ly needle into the inj ection sight . Piston 48 is driven by lead screw 30 at a steady rate, while the practitioner is able to visually observe the f~Yp -l c;t-n ol~ the contrast media from syringe 12. The medical practitioner is in 30 complete control of the injection process. Unlike with very expensive and complicated devices where electronics take complete control over the process with the jnn Of the medical practitioner, the instant power injector ~: _l;Rh,~c one result: responds to the desire 35 of the practitioner by forcing the contrast media out of syringe 12 into the patient at a steady rate of delivery. The injection process may be interrupted any WO 95/13841 1 ~,1,. 1.': 'C
2~7649~ --time upon rPloa~;n~ trigger switch into neutral position. When lead screw 30 is in its completely ~l~tPn~lPrl p~7~1tirm, that is, piston 48 has ~ , lPtPly discharged contrast media from syringe 12, lead screw follower 32 triggers forward limit switch 36 to stop motor 22 Upon completing the injection process, hlltt~rfly needle 13 is ~ rr~nnPctP~i from the patient and lead screw 30 is rPtrArtPd to its initial t~
position. Syringe 12 is ~;~cr~nnocted from power injector 10 by ~ Pn~;n~ male rol~rl ;n~ 46 from female co~rlin~ 38 and ~;~Pn~in~ flange 52 from receiving slot on f ront portion 16 of the device 10 .
Reference is now being made to the ~ of the present invention shown in FIGS. 10 to 17 which has an; ~v~ in the r-~ -rl; n~ o the syringe to the hand-held power injector _nd an Plectric~l circuitry a~sQr; ~tecl with the r~url ;n~ to prevent unwanted or ~cr;~Pnt~l activation of the power injector.
FIG. 10 is a pP~ e.l ;ve view of a hand-held power injector 60, without a syringe, having female ~
means denoted 50nPr:~l ly at 70 to receive a syringe.
Pemale r-3e_ means 70 is of a semi-circular shape and comprises an, _ _ slot 72 and protrusion 74 as best seen in FIG. 15.
FIG. 11 is a pPrspPct;ve view of a syringe 80 having male Pn~a,3 means denoted generally at 90 to engage female ~ yay means 70. Male Pn~a3 means 90 is of an oval shape and ~ ~o~ a flange 92, said flange having two V-shaped recesses 94 and 94 ' therein spaced 180~ from each other and defined by tabs 96 and 96 ' and tabs 98 and 98 ' FIG 12 is a p~L~ye,_Live view and FIG. 14 is a side elevational view of the hand-held power injector 60 assembled with syringe 80. As best can be seen in FIG.
16, 1ange 92 of male ~lly~yt ~ means 90 is inserted into slot 72 of _emale ~--ycly ~ means 70 in such a way WO 9~113841 2 ~ 7 6 4 ~ ~ I ~1 . , 4r .
that protrusion 74 fully engages either V-shaped recess 94 or V-shaped recess 94' Having two j~lFntit~Al V-shaped recesses in syringe 80 enables the practitioner to easily engage syringe 80 with power injector 60 by holding one of the v-shaped recesses vertically.
FIG. 17 is an electrical circuit diagram that serves to activate and deactivate the power inj ector .
Electrical circuit diagram 100 comprises:
battery recharger unit 112; battery ~ e.,llaLyt:r receptacle 114; resistor 116; battery power source 18 (battery power source 40 in FIG. 2); forward trigger switch 120 (trigger switch 20a in PIG. 1); reverse trigger switch 120a (trigger switch 20 b in FIG. 1);
reverse limit switch 122 (reverse limit switch 34 in PIGS. 3 and 4); forward limit switch 122a (forward limit switch 36 in FIGS. 3 and 4); syringe loading activation switch 124; and D . C . motor 126 (D . C . motor 22 in FIGS .
2,3,7 and 8). These items are cr~nnFctF~l by wiring 110 to complete the circuit.
FIG. 15 shows syringe loading activation switch 124 in an open position; that is, prior to female F-g7-means 70 receiving-male ~,, means 90. In FIG.
16, male and female t: _ ~ means, 70 and 90, are in en~ , and syringe loading activation switch 124 is in a closed position.
To operate the hand-held power injector, syringe 80 is loaded into hand-held power injector 60 by inserting f lange 92 of male, _ _ means 90 into slot 72 o~
female t: Iya!~ ~ means 70 in such a way that protrusion 74 fully engages v-shaped recess 94 or V-shaped recess 94 ' . With the syringe 80 fully engaged with hand-held power inj ector 60, Flange 92 activates syringe loading activation switch 124. When forward trigger switch 120 (trigger switch 20b in FIG. 1) is pressed by the practitioner the fluid ~ont7;nf~l in the syringe is expelled into the injection site Without the syringe 80 fully engaging the hand-held power injector the W0 95rl3841 ~ ,'^?' 1-2l 76490 syringe loading activation switch 124 is not activated and the device will not expel the ~luid ~orm the syringe when trigger switch 120 is pressed It is to be noted that Al thn~h in the particular ' r"1i t, having the sa~ety feature to prevent inadvertent activation o~ the device, the pistol shaped device was described, the sa~ety feature may be used with other co~ rAt; nnq as well.
As is apparent ~rom the ~oregoing description, the power injector is ~L ~ ly simple, compact, easy to hold and operate and is ;n-Al. ;ve. The lack of complicated ~l~ctrnn;r R virtually ~l;m;n itpq ~ailures and breakdowns which plague c _ 1; rAtPd il~LL, R, Medical pP~ l have complete control during the use of the device which makes the pr-Act;re 0 delivering contrast media to the patient a more tolerable and rl PAR;~nt P~qlDr; rllCf' than that associated with bulky, ~- _l;rlt~l instL, 'Al;t;~q. The ~ y~y ~ ~eature between the 8yringe and the power assistor prevents inadvertent activatio~ o~ the power assistor and the rnnR~r~ nt undesired F'~lll R; nrl oi~ the liquid ~rom the syringe.
This invention relates to a hand-held controllable -power injector as applied to syringes adopted to deliver a liquid into a patient . Such inj ectors are used ~or example to deliver, by injection, X-ray contrast media into a patient prior to or during urographic or angiographic procedures.
Urography is a radiological technique wherein at least a part of the urinary tract of a mammal is rendered opaque by intravenous inj ection o~ a contrast medium or by inj ection into the bladder through the urethra.
Angiography is also a radiological technique wherein the arteries or Yeins of a mammal are rll1tl;n~
by inj ecting a radiographic medium.
In both to~-hn; qll~c the coated vascular structures are radiographically imaged ~or diagnostic purposes.
For delivery to the de3ired site, the contrast medium is placed in an appropriate syringe and ~orced through a hollow needle or a catheter in such a manner that the contrast medium enters the blood stream or the bladder at the appropriate time and place ~or taking r~-l; q~r~rh; c images . As contrast medium is being injected to the site to be v; c-l~l; 70d through the hollow needle or a catheter, high pressures are of ten ~nt olln~ l, sometimes as high as 1, ooo p5i (6.9 MPa) .
This requires a rather high force to be exerted on the pi~ton in order to deliver the content o~ the syringe.
Furf-hl _d, such ~orce is to be exerted in a constant ~~
manner for ~ n~;n--~us and even volume delivery o~ the contrast medium. Early injection systems were designed for manual injection o~ the contrast medium by means o~
a hand-held glass syringe. A mechanical injection system activated by a foot switch has also been, and is )0 W0 95/13841 ;~ 1 7 ~ ~ 7 ~
o still being, used for most general radiographic procedures. However, this system was only rarely used for coronary angiography for the probable reason that nr~r~tnr control is greatly reduced and the risk of 5 coronary artery dissection; nnr~R~cl Power inj ectors in general have certain advantages over hand-op~r~t~rl injectors inr11lAin~ the following They reduce reliance on an assistant ~n~hl in~ the op~ratnr to be in ,~ _ lete control of the injection of lO the contrast medium, they can deliver a precise volume, and the ~Lt~DuL~ nrr~tF~l can be limited by pr~R~t a P1~:DI~ULI: limit.
Power injectors are of three types: hydraulic, rnl ti r and P1 ectr; r . Hydraulic injectors have an 15 ~1 ectri r motor rnnnrrted to a hydraulic pump, which drives a ram.. rnnn~rt~l to a syringe that rnnt~inR the contrast medium- In 1 t i c inj ectors, the source of power is - _ e~Ded gas supplied by a tank or I:D~OL ~lPrtr;r injector8 are powered by ~ ctrir 20 motors in which a tr~nPmi R~inn means serves to change circular motion into linear motion which then drives a ram While typical power injectors ~1 ;m;n~t~ the physical effort required with manual injectors, they are 25 not easy to use, are expensive and the perception of instAnt Inl~nl-~ control present with manual injectors is lost because the syringe and controls for the injectors are not hand-held or not conveniently h~n~ hl ~ during the injection proces6. For example, a gas power-30 injector hand-held syringe does rl ;m;n~te the physical ef f ort associated with manual inj ection and also provides a perceived inst~nt~n~o~lR control of the injection, however, it reSIuires a gas system to power the syringe, such as pLtD~uLized carbon dioxide gas.
35 The gas delivery system includes a carbon dioxide gas tank with various indicators and controls, which reduces the portability of the device, it requires valuable , 21 764q~
-- 3 -- .
3pace in the proximity of the injection, it add3 to the complexity of using the device for the; nt~n~l~tl purpose and requires periodic replacement of the gas tank.
~3attery powered injectors are al30 available for ----5 use in angiography and urography employing a syringe for holding a contrast medium and a plunger connected to a -h~n; ~1 mean3 to automatically deliver the contrast medium. Some of these injectors include microprocessor technology for p~y~ ;n~ rates and time delivery and 10 have visual or audio display for ease o controlling the injection process. As these injectors become more sophisticated, the cost of making and using them increases and the complexity of use tends to increase the c,~ u~ities for breakdown.
The present invention is directed to a hand-held, light-weight power inj ector which eliminates the physical effort required with manual injectors but otherwise allows the practitioner complete human control of the inj ection proces3 .
2~ Viewed from one a3pect the invention provide3 a hand-held power inj ector for deliverirLg liquid media to a patient, comprising a casing, a syringe having a slideable piston therein and being removably coupIed to said ca3ing, drive mean3 in 3aid casing for driving the piston in said syringe to deliver said liquid to the patient, a manually operable switch for ;~-t1l~tln~ said drive means, and a 3yringe sen3ing 3witch for permitting actuation of said drive means only when said syringe is coupled to said casing, the casing having a slot and the 3 o syringe having a f lange arranged to be received in the -slot, a protrusion on the ca3ing F~n~ ;n~ in a rece33 in the flange when the syringe i3 coupled to the ca3ing, and wherein the syringe 3en3ing 3witch is located adj acent to said slot .
There is thus provided an; ~ ,v~ in the coupling of the syringe to the ca3ing of the hand-held power in~ector which i3 de3iy-ned to prevent unintended AMEND~D SHEEr 21 7~49~
.
activation of the power in~ ector .
The syringe sensing switch will normally only detect the syringe when the f lange is properly engaged ~ =
in the slot. En~ay. t of the protrusion in the recess 5 can ensure correct positioning of the syringe during coupling. Preferably the recess is deined between two tab portions of the f lange and the syringe sensing switch is arrânged to be engaged by one of said tab portion~ when the syringe is coupled to the casing.
Viewed from another aspect the invention provides â
hand-held power injector comprising a pistol-shaped casing, a syringe, and recharging means.
A preferred embodiment of the power injector is designed to be hand-held by one hand, light weight, 15 inexpensive and to allow complete control over the process of delivering râdiopâque media to the patient by the medical practitioner. To that end, its conf iguration resembles a pistol the handle portion of which provides for firm hold. The manually operable 20 switch, having forward, reverse and neutral po3itions, is pref erably located in the handle portion to be controlled by the index finger of the practitioner.
While the preferred device doe3 not incorporate complicated and expensive electronic components which 25 tend to breâk down and are c~~e,r~, - to use, it provides electrical energy to deliver the contrast media to the patient at a constant rate of delivery by driving a piston âlong the syringe barrel. The device preferably incorporates limit switches to automatically stop an electric motor when a lead screw, which engages the piston, is in its initial or completel position.
The ca3ing is advantageously made of light but tough plastic material and gafely houseg all ~ n~nt therein which may include:
AMENDED SHEET
W0 95113841 2 1 7 6 4 9 ~ C
.
a D . C . motor to provide angular motion;
rechargeahle batteries to supply electrical power 6 to the motor;
recharging means for the batteries;
a lead screw having a f emale ~ J~ means to engage a piston;
gear means to tr~n~lAt~ angular motion produced by the motor to linear motion of the lead screw;
limit switches to stop the motor when lead screw is in its initial or c ~l~t~ly ~tf~nrlpcl pns;tinnc;
and trigger switch with ~l~rtric;~l leads to h~ttPr;F.
and to the motor for controlling the, v. of the lead screw.
The syringe used may be of various sizes, such as from lO ml to 50 ml to 100 ml or larger, APr~onrl;n~ on the volume requirement of the patient and the type and rnnrf~ntt-;lt;nn Of the r~l;nrlrlll~ or other media. The syringe may have a luer cnnn~ctnr at one end to engage a r~th~t~r or a b~ltt~rfly needle which is to be inserted in the inj ection site . The other end of the syringe i6 preferably equipped with a flange to engage a receiving slot in the front end of the casing of the hand-held power inj ector . The syringe barrel holds a ~ hle piston or plunger therein and is preferably f~ ;rp~l with a male ~ means to mate with f emale . means of the lead screw.
The recharging means may consist of a recharger unit ~'I'l;rr'"l with two plugs one of which is inserted into the receptacle on the power injector and the other into a standard ~l~ctr;rll outlet.
Viewed from a further aspect the invention provides a hand-held power inj ector f or delivering liquid media to a patient I , q;n~
a pistol-shaped casing to provide for ease of h~n~ll ;n~, said casing comprising a main tl~hular body portion having a distal end and a proximal end and a wo 95/13841 2 ~ ~ ~ q 9 ~
handle portion integral therewith at the proximal end thereof to house and support r~ nnPnt parts therein;
a syringe removably coupled to said distal end of said main tubular body portion of said pistol-shaped 5 casing; and a trigger switch in said handle portion of said pistol-shaped casing; said pistol-shaped casing rnntAining drive means which comprises:
a battery-powered motor to ~PnPrAtP angular rotation;
a lead screw rotatably coupled with said motor by gear means to convert angular rotation to linear motion, said lead screw having at one end thereof a female rol~rl;n~ means;
a first limit switch rnnnPCtPrl to said lead screw and said motor to Al~t~ ~;rAlly disengage said motor and prevent further forward driving of the lead screw when the lead screw is at its ~ , ~ etPl y Pl~tpnrlpcl position;
a second limit switch cnnnPrtP~l to said lead screw and motor to Allt~ tirAlly disengage said motor and to ZO prevent ~urther reverse driving of the lead screw when the lead screw is at its initial position;
wherein said syringe ~ ~P~:
a syringe barrel having a luer rnnnPctnr at one end thereof for receiving a C~thPtPr and a flange at the other end thereof for drop-load Pn~;n~ said tubular body portion of gaid ca8ing and a pi8ton Rl ;~lPAhly positioned in said syringe barrel having a male rollrl;
means to engage said f emale rmlrl i n~ means of said lead screw;
said trigger switch rnnnPrtPrl to said motor and said battery having forward, reverse and o~ positions to control r v, of said lead screw coupled to said piston to inject liquid media into a patient;
and wherein the i ~ . v~ comprises:
a female engagement means at the distal end of said main tubular body portion of the pistol-shaped casing, said female engagement means having a semi-circular .
shape and comprising an engagement ælot and a protrusion;
a syringe loading activation switch adj acent with said slot and said ~.oLLu~ion in said fesle ~d~
means, said syringe activation switch to be activated when said syringe is engaged with said tubular body portion o~ the pistol-shaped casing;
a male ,~ means at one end of the syringe to engage said f egle ~on~3 ' means, said male engagement means having a generally oval shape and ~ a flange, said flange having at least one v-shaped recegs therein defined by tabs; and wiring cnnn~ct;r~ said syringe activation switch with said trigger switch, said syringe activation switch, when activated, ~ etf~ the elecerical circuit between said trigger switch C~ nn~ct-~l to said motor and battery so that the pressing of the trigger switch controls the, .~ L of said lead screw to said piston to inject liguid media into a patient.
Certain hand-held power injectors will now be described by way of example and with reference to the ::lCf, ying drawings, in which:-FIG. l is a perspective view of a hand-held power injector, a syringe engaged with said power iniector, butt.o~fly needle in place and battery charger unit;
FIG 2 . is a Eecti ~,nAl view of the hand-held power inj ector;
FIG. 3 is a cross-sPrt;rn~l view o~ the hand-held power injector taken along the line 3-3 of FIG. 2, 3 0 showing the syringe engaged and the syringe piston in its ~ c.y position;
FIG. 4 is a cross-sectional view of the hand-held power injector, showing syringe piston in its ~ t~n~
position, taken along line 3-3 of FIG. 2;
FIG 5 is a transverse cross-sertir~n~l view of the hand-held power ir,jector and syringe engaged therewith, WO 95113841 2 1 7 ~ ~ q ~ ~' , ? 1^
,~
taken along line 5-5 of FIG. 2;
FIG. 6 is a partial transverse crosæ-sectinnZll view of the hand-held injector taken along line 5-5 of FIG.
2;
FIG. 7 is a cross-se~ti nn~l view of the hand-held power inj ector taken along the line 7 - 7 of FIG . 2;
FIG. 8 is a cross-sectional view of the hand-held power inj ector taken along the line 8 - 8 of FIG . 2; and FIG 9 i5 a perspective view of the syringe not engaged with the power injector.
FIG 10 is a p~r~tive view of a hand-held power inj ector having a f emale e:l~y~y. means to receive a syringe;
FIG. 11 is a p~ ive view of a syringe having male ~ycly. means for connection to the hand-held power inj ector;
FIG. 12 is a perspective view of the hand-held power injector with the syringe engaged;
FIG. 13 is a side elevational view of the hand-held power injector shown in FIG. 10;
FIG. 14 is a side elevational view of the hand-held power inj ector with the syringe engaged shown in FIG .
12;
FIG. 15 is a crosa-sect; nn~l view of the t~
means of the hand-held power injector taken along the line A-A of FIG . 13 i FIG. 16 is a cross-sert;nn~l view of the ~iydy.
means of the hand-held power inj ector and the ~yay.
means of the syringe taken along the line B-B of FIG.
14; and FIG. 17 is an electrical circuit diagram which serves to activate and deactivate the power inj ector .
R~ff~r~ing to FIG. 1, power injector 10 i8 shown with syringe 12 Pn~ging gaid device, butterfly needle 13 Att~-~h~rl to said syringe by luer ~nnn~ctn~ 50 and battery recharger 14 is ready to engage power inj ector 10 by insertion of plug 44 into receptacle 42.
W095/13841 }~ . b' :C
~176~
.
g When assembled toyether, power injector 10 and syringe 12, along with handle 18 and trigger 20a-20b, l~E. ' lP a pistol. This configuration provides for firm hold control and convenient handle ability. The power inj ector 10 comprises a casing which serves as a housing and chassis for the r ,~n~nts~ cnnt~;n~ therein.
Referring to syringe 12, as shown in FIGS. 1, 2, 3 and 9, it, , s~ a syringe barrel to receive an injectable agent therein, said syringe barrel having a luer ~ ~nn~ct~r 50 at one end thereof serving as means for attaching b~ltt~rfly needle 13 thereto, and the other end of said tubular body having male co~rl;n~ 46 to engage female ro~lrl ;n~ 38. Flange 52 of syringe 12 locates and fixes syringe within a ~ ~ l; Ary slot (not shown) in front 16 of the power injector 10.
Loading of syringe 12 is exceptionally easy and practical, since the syringe is drop-loaded onto said slot without the need of any twisting or turning motion.
Positioned in said syringe barrel in a sl; ~l~Ahle rPlA~;~ln~hir is pi8ton 48 integral with male col~rli 46 .
As best seen in FIGS. 2, 3, 7 and 8, the casing or housing of the power injector 10 houses a D.C. motor 22 which produces angular rotation of gear 24. Gear 24 drives gear 26 which has int~rnAl thread 28. Linear v. of lead screw 30 is produced by preventing its rotation and by the angular rotation of ;ntF-rnAl thread 28. A follower 32, fixed to the back end of lead screw 30, prevents rotation of the lead screw during linear ~ by the, _ _ ~ of peg 32a of the fnl 1. ~_L 32 rolling or sliding in slot 32b.
D . C . motor 22 is powered by rechargeable batteries 40, which are located in handle 18 of power injector 10.
Trigger switch 20a-20b enga~eably coupled to hAtt~
3~ 40 and D.C. motor 22 has three positions: forward drive, reverse drive and o~f position. Forward limit switch 36 is positioned so that lead screw follower 32 triggers WO95~13W1 2 1 764~0 ~ o the switch and stops the motor when piston 48 is in its ~YtPnt9~ pnS; ti nn a8 shown in FIG 4 . Likewise, the backwards limit switch 34 is positioned so that the lead screw follower 32 triggers the switch and stops the motor 22 when pi8ton 48 is in its engagement pnfi;t;rn as shown in FIG 3 The power inj ector 10 is recharged by plugging recharger 14 in a standard electrical outlet and inserting plug 44 into receptacle 42 during periods in which the device is not in use.
Reference is now made to the r,pl~rAt; nn of the hand-held power inj ector . The syringe 12 could be pref illed with an injectable liquid, such as contrast media, or the power injector 10 could be used to fill the syringe.
If not prefilled, the empty syringe 12 is loaded onto the front 16 of the device, having male rn -r~ ;n~ 46 engage female couple 38, then placing the power injector 10 in an upright position by placing it with is ~lat surface 9 on top of a flat object, such as a table. The syringe 12 is then filled with contrast media by first driving the piston 48 to its ~YtPnrl~fl position within the syringe as shown in FIG. 4 A plastic tube (not shown) is At~Arh~ to luer rnnn-~ctnr 50 and the contrast media is ~y~llu.led into the syringe 12 by placing the opposite end of the plastic tube in a rnntA;n-or filled with contrast media and retracting piston 48 back into its ~llycLy pos; t; nn . Upon completion of the process the plastic tube is removed from the luer rnnnPctor 50 and a butterf ly needle 13 is attached thereto Af ter butter~ly needle 13 is AttArh~ to luer rnnn~rtor 50, the upright position of power injector 10 is ~-;ntA;n~.rl until the air from syringe 12 and b~t,orfly needle 13 is purged by driving piston 48 in the forward direction.
To drive piston 48 _orward or in reverse trigger switch 20a-20b is provided. Trigger switch 20a-20b is positioned in handle 18 of the power injector 10 to control both the _orward and reverse motion of the WO 9S/13841 2 ~
piston: pressing 20b results in forward motion o~ piston 48, while pressing 20a re6ults in reverse motion thereof. When neither 20a nor 20b trigger switch is pressed, switch ;Illt( t;n~lly reverts to neutral or of 5 position and motor 22 becomes ~ n~ed.
In the case when the syringe 12 is prefilled with contrast media, the syringe is loaded in the same manner as above-described, then the power inj ector 10 i8 positioned in an upright position. Syringe cap (not 10 shown) is removed from luer cnnn-~ct~r 50 and ~ltt~rfly needle 13 is ;~ttFInh~ to luer onn~ctnr 50 The air i8 then purged from the syringe as above-described.
Upon purging the air f r syringe 12, the power inj ector 10 is held by the medical practitioner at 15 handle 18 with index finger resting on trigger switch 20a-20b which is in the off poR;t;nn~ Protective sheath (not shown) is removed from butterfly needle 13 and the same is inserted into the injection sight on the patient. The pract;t;nn~r then activates motor 22 by 20 pressing trigger switch 20b which Plf~Ctr;t~lly engages ~ ttF'ri ~-2 40 with motor 22 . Motor 22 produces angular motion which is converted into linear motion through gears 24 and 26 acting on lead screw 30. Lead screw 30 drives piston 48 in the barrel of syringe 12 forcing 25 contrast media t_rough butterf ly needle into the inj ection sight . Piston 48 is driven by lead screw 30 at a steady rate, while the practitioner is able to visually observe the f~Yp -l c;t-n ol~ the contrast media from syringe 12. The medical practitioner is in 30 complete control of the injection process. Unlike with very expensive and complicated devices where electronics take complete control over the process with the jnn Of the medical practitioner, the instant power injector ~: _l;Rh,~c one result: responds to the desire 35 of the practitioner by forcing the contrast media out of syringe 12 into the patient at a steady rate of delivery. The injection process may be interrupted any WO 95/13841 1 ~,1,. 1.': 'C
2~7649~ --time upon rPloa~;n~ trigger switch into neutral position. When lead screw 30 is in its completely ~l~tPn~lPrl p~7~1tirm, that is, piston 48 has ~ , lPtPly discharged contrast media from syringe 12, lead screw follower 32 triggers forward limit switch 36 to stop motor 22 Upon completing the injection process, hlltt~rfly needle 13 is ~ rr~nnPctP~i from the patient and lead screw 30 is rPtrArtPd to its initial t~
position. Syringe 12 is ~;~cr~nnocted from power injector 10 by ~ Pn~;n~ male rol~rl ;n~ 46 from female co~rlin~ 38 and ~;~Pn~in~ flange 52 from receiving slot on f ront portion 16 of the device 10 .
Reference is now being made to the ~ of the present invention shown in FIGS. 10 to 17 which has an; ~v~ in the r-~ -rl; n~ o the syringe to the hand-held power injector _nd an Plectric~l circuitry a~sQr; ~tecl with the r~url ;n~ to prevent unwanted or ~cr;~Pnt~l activation of the power injector.
FIG. 10 is a pP~ e.l ;ve view of a hand-held power injector 60, without a syringe, having female ~
means denoted 50nPr:~l ly at 70 to receive a syringe.
Pemale r-3e_ means 70 is of a semi-circular shape and comprises an, _ _ slot 72 and protrusion 74 as best seen in FIG. 15.
FIG. 11 is a pPrspPct;ve view of a syringe 80 having male Pn~a,3 means denoted generally at 90 to engage female ~ yay means 70. Male Pn~a3 means 90 is of an oval shape and ~ ~o~ a flange 92, said flange having two V-shaped recesses 94 and 94 ' therein spaced 180~ from each other and defined by tabs 96 and 96 ' and tabs 98 and 98 ' FIG 12 is a p~L~ye,_Live view and FIG. 14 is a side elevational view of the hand-held power injector 60 assembled with syringe 80. As best can be seen in FIG.
16, 1ange 92 of male ~lly~yt ~ means 90 is inserted into slot 72 of _emale ~--ycly ~ means 70 in such a way WO 9~113841 2 ~ 7 6 4 ~ ~ I ~1 . , 4r .
that protrusion 74 fully engages either V-shaped recess 94 or V-shaped recess 94' Having two j~lFntit~Al V-shaped recesses in syringe 80 enables the practitioner to easily engage syringe 80 with power injector 60 by holding one of the v-shaped recesses vertically.
FIG. 17 is an electrical circuit diagram that serves to activate and deactivate the power inj ector .
Electrical circuit diagram 100 comprises:
battery recharger unit 112; battery ~ e.,llaLyt:r receptacle 114; resistor 116; battery power source 18 (battery power source 40 in FIG. 2); forward trigger switch 120 (trigger switch 20a in PIG. 1); reverse trigger switch 120a (trigger switch 20 b in FIG. 1);
reverse limit switch 122 (reverse limit switch 34 in PIGS. 3 and 4); forward limit switch 122a (forward limit switch 36 in FIGS. 3 and 4); syringe loading activation switch 124; and D . C . motor 126 (D . C . motor 22 in FIGS .
2,3,7 and 8). These items are cr~nnFctF~l by wiring 110 to complete the circuit.
FIG. 15 shows syringe loading activation switch 124 in an open position; that is, prior to female F-g7-means 70 receiving-male ~,, means 90. In FIG.
16, male and female t: _ ~ means, 70 and 90, are in en~ , and syringe loading activation switch 124 is in a closed position.
To operate the hand-held power injector, syringe 80 is loaded into hand-held power injector 60 by inserting f lange 92 of male, _ _ means 90 into slot 72 o~
female t: Iya!~ ~ means 70 in such a way that protrusion 74 fully engages v-shaped recess 94 or V-shaped recess 94 ' . With the syringe 80 fully engaged with hand-held power inj ector 60, Flange 92 activates syringe loading activation switch 124. When forward trigger switch 120 (trigger switch 20b in FIG. 1) is pressed by the practitioner the fluid ~ont7;nf~l in the syringe is expelled into the injection site Without the syringe 80 fully engaging the hand-held power injector the W0 95rl3841 ~ ,'^?' 1-2l 76490 syringe loading activation switch 124 is not activated and the device will not expel the ~luid ~orm the syringe when trigger switch 120 is pressed It is to be noted that Al thn~h in the particular ' r"1i t, having the sa~ety feature to prevent inadvertent activation o~ the device, the pistol shaped device was described, the sa~ety feature may be used with other co~ rAt; nnq as well.
As is apparent ~rom the ~oregoing description, the power injector is ~L ~ ly simple, compact, easy to hold and operate and is ;n-Al. ;ve. The lack of complicated ~l~ctrnn;r R virtually ~l;m;n itpq ~ailures and breakdowns which plague c _ 1; rAtPd il~LL, R, Medical pP~ l have complete control during the use of the device which makes the pr-Act;re 0 delivering contrast media to the patient a more tolerable and rl PAR;~nt P~qlDr; rllCf' than that associated with bulky, ~- _l;rlt~l instL, 'Al;t;~q. The ~ y~y ~ ~eature between the 8yringe and the power assistor prevents inadvertent activatio~ o~ the power assistor and the rnnR~r~ nt undesired F'~lll R; nrl oi~ the liquid ~rom the syringe.
Claims (9)
1. A hand-held power injector for delivering liquid media to a patient, comprising a casing, a syringe having a slideable piston therein and being removably coupled to said casing, drive means in said casing for driving the piston in said syringe to deliver said liquid to the patient, a manually operable switch for actuating said drive means, and a syringe sensing switch for permitting actuation of said drive means only when said syringe is coupled to said casing, the casing having a slot and the syringe having a flange arranged to be received in the slot, a protrusion on the casing engaging in a recess in the flange when the syringe is coupled to the casing, and wherein the syringe sensing switch is located adjacent to said slot.
2. A hand-held power injector as claimed in claim 3, wherein the recess is defined between two tab portions oi the flange and the syringe sensing switch is arranged to be engaged by one of said tab portions when the syringe is coupled to the casing.
3 . A hand-held power injector as claimed in claim 1 or claim 2, wherein the syringe has two symmetrically arranged flanges, each with a recess.
4. A hand-held power injector for delivering liquid media to a patient comprising:
a pistol-shaped casing to provide for ease of handling said casing comprising a main tubular body portion having a distal end and a proximal end and a handle portion integral therewith at the proximal end thereof to house and support component parts therein;
a syringe removably coupled to said distal end of said main tubular body portion of said pistol-shaped casing; and a trigger switch in said handle portion of said pistol-shaped casing; said pistol-shaped casing containing drive means which comprises:
a battery-powered motor to generate angular rotation;
a lead screw rotatably coupled with said motor by gear means to convert angular rotation to linear motion, said lead screw having at one end thereof a female coupling means;
a first limit switch connected to said lead screw and said motor to automatically disengage said motor and prevent further forward driving of the lead screw when the lead screw is at its completely extended position;
a second limit switch connected to said lead screw and motor to automatically disengage said motor and to prevent further reverse driving of the lead screw when the lead screw is at its initial position;
wherein said syringe comprises:
a syringe barrel having a luer connector at one end thereof for receiving a catheter and a flange at the other end thereof for drop-load engaging said tubular body portion of said casing and a piston slideably positioned in said syringe barrel having a male coupling means to engage said female coupling means of said lead screw;
said trigger switch connected to said motor and said battery having forward, reverse and off positions to control movement of said lead screw coupled to said piston to inject liquid media into a patient;
and wherein the improvement comprises:
a female engagement means at the distal end of said main tubular body portion of the pistol-shaped casing, said female engagement means having a semi-circular shape and comprises an engagement slot and a protrusion;
a syringe loading activation switch adjacent with said slot and said protrusion in said female engagement means, said syringe activation switch to be activated when said syringe is engaged with said tubular body portion of the pistol-shaped casing;
a male engagement means at one end of the syringe to engage said female engagement means, said male engagement means having a generally oval shape and comprises a flange, said flange having at least one v-shaped recess therein defined by tabs; and wiring connecting said syringe activation switch with said trigger switch, said syringe activation switch, when activated, completes the electrical circuit between said trigger switch connected to said motor and battery so that the pressing of the trigger switch controls the movement of said lead screw to said piston to inject liquid media into a patient.
a pistol-shaped casing to provide for ease of handling said casing comprising a main tubular body portion having a distal end and a proximal end and a handle portion integral therewith at the proximal end thereof to house and support component parts therein;
a syringe removably coupled to said distal end of said main tubular body portion of said pistol-shaped casing; and a trigger switch in said handle portion of said pistol-shaped casing; said pistol-shaped casing containing drive means which comprises:
a battery-powered motor to generate angular rotation;
a lead screw rotatably coupled with said motor by gear means to convert angular rotation to linear motion, said lead screw having at one end thereof a female coupling means;
a first limit switch connected to said lead screw and said motor to automatically disengage said motor and prevent further forward driving of the lead screw when the lead screw is at its completely extended position;
a second limit switch connected to said lead screw and motor to automatically disengage said motor and to prevent further reverse driving of the lead screw when the lead screw is at its initial position;
wherein said syringe comprises:
a syringe barrel having a luer connector at one end thereof for receiving a catheter and a flange at the other end thereof for drop-load engaging said tubular body portion of said casing and a piston slideably positioned in said syringe barrel having a male coupling means to engage said female coupling means of said lead screw;
said trigger switch connected to said motor and said battery having forward, reverse and off positions to control movement of said lead screw coupled to said piston to inject liquid media into a patient;
and wherein the improvement comprises:
a female engagement means at the distal end of said main tubular body portion of the pistol-shaped casing, said female engagement means having a semi-circular shape and comprises an engagement slot and a protrusion;
a syringe loading activation switch adjacent with said slot and said protrusion in said female engagement means, said syringe activation switch to be activated when said syringe is engaged with said tubular body portion of the pistol-shaped casing;
a male engagement means at one end of the syringe to engage said female engagement means, said male engagement means having a generally oval shape and comprises a flange, said flange having at least one v-shaped recess therein defined by tabs; and wiring connecting said syringe activation switch with said trigger switch, said syringe activation switch, when activated, completes the electrical circuit between said trigger switch connected to said motor and battery so that the pressing of the trigger switch controls the movement of said lead screw to said piston to inject liquid media into a patient.
5. A hand-held power injector as claimed in any preceding claim, wherein said syringe contains liquid media and said liquid media contains an imaging agent.
6. A hand-held power injector as claimed in claim 6, wherein said imaging agent is for angiographic examination of a mammal.
7 . A hand-held power injector as claimed in claim 6, wherein said imaging agent is for urographic examination of a mammal.
8. A method of angiographic examination of a mammal comprising the administration of an angiographic imaging agent to said mammal using a hand-held power injector as claimed in any of claims 1 to 5.
9. A method of urographic examination of a mammal comprising the administration of an urographic imaging agent to said mammal using a hand-held power injector as claimed in any of claims 1 to 5.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/155,449 US5322511A (en) | 1992-04-21 | 1993-11-19 | Portable hand-held power injector |
| US155,449 | 1993-11-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2176490A1 true CA2176490A1 (en) | 1995-05-26 |
Family
ID=22555479
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002176490A Abandoned CA2176490A1 (en) | 1993-11-19 | 1994-11-18 | Portable hand-held power injector |
Country Status (15)
| Country | Link |
|---|---|
| US (1) | US5322511A (en) |
| EP (1) | EP0729367B1 (en) |
| JP (1) | JPH09507400A (en) |
| CN (1) | CN1141597A (en) |
| AU (1) | AU1032795A (en) |
| CA (1) | CA2176490A1 (en) |
| CZ (1) | CZ144796A3 (en) |
| DE (1) | DE69416686T2 (en) |
| ES (1) | ES2128694T3 (en) |
| HU (1) | HUT75769A (en) |
| IL (1) | IL111691A0 (en) |
| NO (1) | NO962010L (en) |
| PL (1) | PL314524A1 (en) |
| SK (1) | SK59996A3 (en) |
| WO (1) | WO1995013841A1 (en) |
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- 1994-11-18 EP EP95900881A patent/EP0729367B1/en not_active Expired - Lifetime
- 1994-11-18 CA CA002176490A patent/CA2176490A1/en not_active Abandoned
- 1994-11-18 IL IL11169194A patent/IL111691A0/en unknown
-
1996
- 1996-05-15 NO NO962010A patent/NO962010L/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8221347B2 (en) | 2004-12-01 | 2012-07-17 | Acushot, Inc. | Needle-free injector |
Also Published As
| Publication number | Publication date |
|---|---|
| AU1032795A (en) | 1995-06-06 |
| US5322511A (en) | 1994-06-21 |
| PL314524A1 (en) | 1996-09-16 |
| WO1995013841A1 (en) | 1995-05-26 |
| SK59996A3 (en) | 1997-03-05 |
| DE69416686D1 (en) | 1999-04-01 |
| CZ144796A3 (en) | 1996-12-11 |
| HU9601318D0 (en) | 1996-07-29 |
| EP0729367B1 (en) | 1999-02-24 |
| HUT75769A (en) | 1997-05-28 |
| JPH09507400A (en) | 1997-07-29 |
| DE69416686T2 (en) | 1999-10-28 |
| EP0729367A1 (en) | 1996-09-04 |
| CN1141597A (en) | 1997-01-29 |
| NO962010L (en) | 1996-06-28 |
| IL111691A0 (en) | 1995-01-24 |
| NO962010D0 (en) | 1996-05-15 |
| ES2128694T3 (en) | 1999-05-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |