US20020107483A1 - Needle enclosing safety catheter - Google Patents
Needle enclosing safety catheter Download PDFInfo
- Publication number
- US20020107483A1 US20020107483A1 US09/778,201 US77820101A US2002107483A1 US 20020107483 A1 US20020107483 A1 US 20020107483A1 US 77820101 A US77820101 A US 77820101A US 2002107483 A1 US2002107483 A1 US 2002107483A1
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- United States
- Prior art keywords
- catheter
- needle
- enclosure
- cavity
- tip
- Prior art date
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Classifications
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- 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
- A61M25/00—Catheters; Hollow probes
- A61M25/01—Introducing, guiding, advancing, emplacing or holding catheters
- A61M25/06—Body-piercing guide needles or the like
- A61M25/0612—Devices for protecting the needle; Devices to help insertion of the needle, e.g. wings or holders
- A61M25/0618—Devices for protecting the needle; Devices to help insertion of the needle, e.g. wings or holders having means for protecting only the distal tip of the needle, e.g. a needle guard
-
- 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
- A61M5/31—Details
- A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
- A61M5/3205—Apparatus for removing or disposing of used needles or syringes, e.g. containers; Means for protection against accidental injuries from used needles
- A61M5/321—Means for protection against accidental injuries by used needles
- A61M5/3243—Means for protection against accidental injuries by used needles being axially-extensible, e.g. protective sleeves coaxially slidable on the syringe barrel
- A61M5/3245—Constructional features thereof, e.g. to improve manipulation or functioning
- A61M2005/3247—Means to impede repositioning of protection sleeve from needle covering to needle uncovering position
- A61M2005/325—Means obstructing the needle passage at distal end of a needle protection sleeve
-
- 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
- A61M5/31—Details
- A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
- A61M5/3205—Apparatus for removing or disposing of used needles or syringes, e.g. containers; Means for protection against accidental injuries from used needles
- A61M5/321—Means for protection against accidental injuries by used needles
- A61M5/3243—Means for protection against accidental injuries by used needles being axially-extensible, e.g. protective sleeves coaxially slidable on the syringe barrel
- A61M5/3273—Means for protection against accidental injuries by used needles being axially-extensible, e.g. protective sleeves coaxially slidable on the syringe barrel freely sliding on needle shaft without connection to syringe or needle
Definitions
- intravenous devices Numerous medical procedures involve the insertion of intravenous devices into patients with varying medical conditions. Among these medical conditions are a number of diseases that also present a risk of infection to the medical practitioner providing care.
- the insertion of intravenous devices generally requires the use of a sharp implement, which conventionally has been a hollow bore needle, for piercing the skin to allow insertion of a hollow catheter.
- the distal end of the catheter must be inserted into, but not through, a blood vessel.
- proper placement of the catheter is confirmed by visual observation of a “flash-back” of blood that passes through the hollow needle into a stationary flash chamber located at the proximal end of the catheter assembly, where it is visualized.
- the objectives of the present invention include:
- FIG. 3 is a longitudinal cross-sectional elevation of the first embodiment of the present invention, in the configuration of FIG. 1A.
- catheter 20 is shown in relation to the other parts of the assembly 10 when in the first configuration for insertion into a blood vessel (not shown).
- An aperture 34 proximate tip 30 is in fluid communication with an interior passageway 36 — seen in FIG. 1B —of catheter 20 .
- a catheter hub 38 securely mates with a needle tip enclosure 50 at a distal enclosure adaptor 52 .
- Enclosure 50 has an enclosure housing 54 , which includes a plurality of intermediate side tabs 56 .
- a proximal portion 58 of enclosure housing 54 has a proximal orifice 60 formed therein.
- Proximal orifice 60 is in fluid communication with a cavity 62 .
- Cavity 62 runs longitudinally through enclosure housing 54 to a distal orifice 64 .
- the solid needle 80 , catheter 20 , and aperture 34 of the present invention cooperate to allow blood flow into space 90 only once the catheter 20 is correctly inserted such that aperture 34 of catheter 20 has entered a blood vessel.
- This “flashback” of blood indicates proper placement of catheter 20 . Inspection of the flash chamber allows the medical practitioner inserting the catheter and needle assembly 10 to visually determine if the assembly is correctly inserted, i.e., the catheter tip containing aperture 34 has entered the blood vessel.
- the distal point 98 may also be arranged to one side or the other of groove 94 (not depicted) or centered (not depicted) relative to the longitudinal axis 12 . These variations in the disposition of distal point 98 may also be optionally employed with any of the other embodiments of the present invention.
Abstract
Description
- Not applicable.
- Not applicable.
- Numerous medical procedures involve the insertion of intravenous devices into patients with varying medical conditions. Among these medical conditions are a number of diseases that also present a risk of infection to the medical practitioner providing care. The insertion of intravenous devices generally requires the use of a sharp implement, which conventionally has been a hollow bore needle, for piercing the skin to allow insertion of a hollow catheter. The distal end of the catheter must be inserted into, but not through, a blood vessel. Normally, proper placement of the catheter is confirmed by visual observation of a “flash-back” of blood that passes through the hollow needle into a stationary flash chamber located at the proximal end of the catheter assembly, where it is visualized. Once the catheter has been inserted to the proper position within the blood vessel, the sharp implement needs to be withdrawn and properly discarded. The acts of withdrawal and disposal pose the greatest threat to the health of the practitioner, since the implement remains sharp enough to pierce skin and is potentially carrying an infectious agent. With the prior art designs, the hollow needle and flash chamber contain a rather large amount of potentially infectious blood, with the result that inadvertent skin puncture of the practitioner can lead to significant transference of infectious agent from the patient to the practioner.
- A system for providing protection from the risk of infection during withdrawal and disposal of a piercing instrument must accommodate various operational constraints. A primary constraint is to minimize interference with the execution of the medical procedure prior to withdrawal and disposal. Accordingly, the system should minimize or eliminate additional steps and preferably should not significantly alter the steps performed without the system. Medical care often occurs in stressful and hurried situations and hence, ease of use is a second constraint. Preferably, the system should not compel the practitioner to carry out any but the most minimal actions to accomplish safe withdrawal and disposal. Additional constraints include cost and ease of construction, compatibility with existing equipment, and adaptability of use across variations in patients and insertion locations.
- A very desirable benefit of such systems would be reduction in the risk of accidental infection. Risk of infection can be reduced by, inter alia, automatic operation, encapsulation of the piercing implement, and a reduction in the fluid and tissue volume associated with piercing instrument removal — since greater volume potentially increases the amount of the infectious agent present. Risk can also be reduced by quick operation. If the system is effective simultaneously with, or at least immediately subsequent to withdrawal, exposure of the piercing instrument is minimized, as is the risk of accidental infection.
- Numerous approaches to providing a safer withdrawal and disposal system have been employed, though two general categories of systems predominate. One category of system deploys a secondary sheath between a needle and a catheter to envelope the needle upon withdrawal from the piercing site, prior to complete withdrawal of the secondary sheath and needle from the catheter. This category of system is relatively sizable and complex, yet still poses a risk of reemergence of the needle. Preventing reemergence may necessitate even more apparatus. Withdrawal is also generally associated with emission of a significant amount of body fluid with this category of system, among other adverse consequences. The second category of system involves affixing a point guard about the tip of the piercing instrument after withdrawal. This approach often requires substantial complexity and substantial additional actions to implement. What's more, with this second category of system, better execution of one desirable benefit, such as secure encapsulation of a piercing instrument, is often exchanged for a poorer execution of another desirable benefit, such as automatic operation.
- As mentioned above, most prior approaches utilize a hollow needle (in fluid communication with a stationary flash chamber having a relatively large volume) for piercing. Hollow needle and flash chamber assemblies, however, present a risk of exposure to the body fluids they contain when the needle is withdrawn. In fact, research reveals that the risk of infection from a hollow needle is many times greater than that from a solid needle. This difference probably arises from the large reservoir of blood within the hollow needle and flash chamber assembly, that then becomes the source of inoculation when inadvertent needle stick injuries occur. Solid needles, on the other hand, have no such reservoir for inoculation. Moreover, when using a hollow needle with a catheter the user may receive an incorrect “flashback” signal. The “flashback” signal is the entry, or “flashing” , of blood into a viewing chamber (called the flashback chamber) in the interior of the catheter and needle system. The flash occurs when a blood vessel is entered and blood can flow into the catheter interior. Hollow needles allow blood to flow into the catheter interior even if only the needle, but not the catheter, has entered the blood vessel. Hence, the user must guess to what degree it is necessary to further insert the needle and catheter, after observing the flashback, to ensure that the catheter is correctly inserted. A system providing greater certainty of correct catheter insertion is preferable.
- The objectives of the present invention include:
- The provision of an improved piercing system which entails a minimum of hindrance to the optimum execution of a medical procedure.
- The provision of an improved piercing system that requires minimum additional actions following the execution of a medical procedure such as the insertion of a catheter.
- The provision of an improved piercing system that requires minimal alterations of the actions involved in the execution of a medical procedure such as the insertion of a catheter.
- The provision of an improved piercing system with ease of use sufficient to curtail any additional demands on the medical practitioner's attention.
- The provision of an improved piercing system that requires minimal additional actions by the medical practitioner to realize the improvement in safety.
- The provision of an improved system and method for catheter insertion using a solid needle to reduce the possibility of infection transference.
- The provision of an improved piercing system that is relatively inexpensive.
- The provision of an improved piercing system of simplified construction.
- The provision of an improved piercing system compatible with existing medical equipment.
- The provision of an improved piercing system adaptable for use across variations in patients and piercing locations.
- The provision of an improved piercing system that reduces the risk of accidental infection.
- The provision of an improved piercing system that operates automatically.
- The provision of an improved piercing system that completely encloses the penetrating elements of the piercing instrument.
- The provision of an improved piercing system that reduces the amount of fluids and tissue which accompany withdrawal of the piercing instrument.
- The provision of an improved piercing system that occurs sufficiently fast to be in effect simultaneously with or at least immediately after withdrawal of the piercing instrument.
- The provision of an improved piercing system, comprised of a catheter and needle, that gives visual confirmation only when the catheter is correctly inserted, and not when just the needle is correctly inserted.
- FIG. 1B is a longitudinal cross-section top plan view of a catheter portion of the first embodiment of the present invention depicted in FIG. 1A.
- FIG. 2 is a longitudinal partial cross-section top plan view of two parts of the first embodiment of the present invention in a second configuration.
- FIG. 3 is a longitudinal cross-sectional elevation of the first embodiment of the present invention, in the configuration of FIG. 1A.
- FIG. 3A is a cross-section view along
line 3A-3A in FIG. 3 of a needle element of the first embodiment of the present invention. - FIG. 4 is a longitudinal cross-sectional elevation of the first embodiment of the present invention, in the second configuration shown in FIG. 2.
- FIG. 5 is a longitudinal cross-sectional elevation similar to a portion of FIG. 3, illustrating a second embodiment of the present invention.
- FIG. 5A is a cross-sectional view along
line 5A-5A of portions of catheter and needle elements of the second embodiment of the present invention. - FIG. 6 is a view along the
longitudinal axis 12 in thedirection 12P of FIG. 1A, of a catheter and needle tip of a third embodiment of the present invention. Similar reference characters indicate similar parts throughout the several views of the drawings. - In FIGS. 1A, 1B &2-4 a first embodiment of a catheter and
needle assembly 10 of the present invention is shown in two configurations. A first configuration for insertion of the catheter and needle assembly is depicted in FIGS. 1A & 3. Two components of the catheter and needle assembly, in a second configuration for safe withdrawal and disposal following insertion, is depicted in FIGS. 2 & 4. - Referring now to FIG. 1A, a first embodiment of a needle tip enclosing catheter and
needle assembly 10 in the first configuration is depicted in partial cross-section. The catheter and needle assembly has alongitudinal axis 12, with aproximal direction 12P and adistal direction 12D. Directions referred to hereafter as transverse are perpendicular to thelongitudinal axis 12. It should be understood that in the FIGS. the catheter and needle assemblies are depicted in straight linear configurations for purposes of clarity only. Depending upon the application, the catheter and needle assembly may have both flexible and inflexible portions. Accordingly,axis 12, though depicted as a straight line, may also be curvilinear in correspondence to the actual disposition ofassembly 10 when in use. In a case of curvilinear disposition,directions direction 12P is alongaxis 12 pointing towards the proximal end of the assembly, and thedirection 12D is alongaxis 12 pointing towards the distal end of the assembly. - FIG. 1B is a cross-section view of a
catheter 20 employed in the first embodiment.Catheter 20 has aproximal base 22 with a plurality offlanges 24 that flare transversely.Base 22 adjoins atransitional section 26 which connects to aconduit 28.Conduit 28 terminates in adistal tip 30. Anopening 32 is formed indistal tip 30. - Returning to FIG. 1A,
catheter 20 is shown in relation to the other parts of theassembly 10 when in the first configuration for insertion into a blood vessel (not shown). Anaperture 34proximate tip 30 is in fluid communication with aninterior passageway 36 — seen in FIG. 1B —ofcatheter 20. Acatheter hub 38 securely mates with aneedle tip enclosure 50 at adistal enclosure adaptor 52.Enclosure 50 has anenclosure housing 54, which includes a plurality ofintermediate side tabs 56. Aproximal portion 58 ofenclosure housing 54 has aproximal orifice 60 formed therein.Proximal orifice 60 is in fluid communication with acavity 62.Cavity 62 runs longitudinally throughenclosure housing 54 to adistal orifice 64. - Referring now to FIG. 2, a cross-section view of
needle tip enclosure 50 is depicted in the second configuration, following successful insertion ofcatheter 20 into a blood vessel (not shown). Within thecavity 62 is a blockingmember 66, seen end-on. When in the second configuration, the position of blockingmember 66 obstructs movement through thecavity 62. - In FIG. 4, blocking
member 66, forced by a spring 67 (or by any other conventional device or material), crossescavity 62 and contacts aninterior wall 68 of theenclosure housing 54.Housing 54 has first andsecond sides side 72 is avent 74 from thecavity 62. - Referring again to FIG. 2, a solid piercing
needle 80 andenclosure 50 are depicted in the second configuration. Thesolid needle 80 has adistal tip 82 and a shaft 84 (shown to be semi-elliptical in cross-section—FIG. 3A), and is attached to aproximal control elemental 86. In FIG. 3,needle tip 82 is seen to have aproximal face 88 at the boundary between thetip 82 and theshaft 84. - In operation,
assembly 10 is initially in the first configuration (shown in FIGS. 1A and 3) for insertingcatheter 20 by piercing the skin withsolid needle tip 82. In the first configuration,enclosure adaptor 52 is fully engaged inhub 38,needle 80 is at its farthest distal position incatheter 20 andneedle enclosure 50, andneedle tip 82 emerges from thedistal opening 32 in readiness for piercing the skin of the patient. During insertion,needle control element 86 is flush against theenclosure 50 withneedle shaft 84 passing throughout theenclosure cavity 62 and the catheterinterior passageway 36. Withincavity 62,needle shaft 84 confines the blockingmember 66 to a first position that is not obstructingcavity 62 as depicted in FIG. 3. Also in the first configuration, theproximal face 88 ofneedle tip 82 is disposed distally pastaperture 34, to allow passage of bodily fluids throughaperture 34 and into anopen space 90 withininterior passageway 36. Thespace 90 is the fraction ofinterior passageway 36 andcavity 62 not occupied byneedle shaft 84.Vent 74 is closed by a well-known airpermissible plug 91 that allows air to escape fromhousing 54 but prevents the escape of blood or other body fluids. At least a portion ofhousing 54 is preferably transparent to form a movable flashback chamber (space 90 and vent 74) which is visible to the user. Whenaperture 34 enters the blood vessel, blood flows alongspace 90 intohousing 54 where it is visible to the user through the transparent portion (not depicted) ofhousing 54. In contrast to prior approaches, the flow of blood alongspace 90 does not occur immediately upon insertion of theneedle 80 into a blood vessel. The prior approaches use hollow needles that allow blood flow through the hollow needle and into the catheter and into a hollow flash chamber in the proximal portion of the apparatus. These approaches allow the blood flow into the catheter and flash chamber even if the needle is inserted in the blood vessel, but the catheter is not. Hence, there is a degree of uncertainty as to whether the catheter is correctly inserted with the prior approaches. Thesolid needle 80,catheter 20, andaperture 34 of the present invention cooperate to allow blood flow intospace 90 only once thecatheter 20 is correctly inserted such thataperture 34 ofcatheter 20 has entered a blood vessel. This “flashback” of blood indicates proper placement ofcatheter 20. Inspection of the flash chamber allows the medical practitioner inserting the catheter andneedle assembly 10 to visually determine if the assembly is correctly inserted, i.e., the cathetertip containing aperture 34 has entered the blood vessel. - After insertion of
catheter 20, removal and disposal ofneedle 80 will follow. Once the catheter andneedle assembly 10 is inserted into a blood vessel,needle enclosure 50 is moved distally alongdirection 12D (FIG. 1A) while simultaneously needle 80 is withdrawn proximally alongdirection 12P untilneedle tip 82 is completely withinenclosure 50. This movement of enclosure orhousing 50 distally relative to the proximal movement ofneedle 80 automatically disposescatheter 20 within the blood vessel. The transition to the second configuration is complete whenneedle tip 82 is locked withinenclosure 50 by blockingmember 66crossing cavity 62.Needle 80 andenclosure 50 are usually then separated fromcatheter 20, which is left inserted in the blood vessel. Also the construction and operation ofenclosure 50, as it moves proximally alongdirection 12P from configuration 1 (shown in FIGS. 1A and 3) to configuration 2 (shown in FIGS. 2 and 4), in cooperation with the construction ofneedle 80, automatically effects a cleansing and encapsulation ofneedle 80. - Beginning from the first configuration (FIG. 1A, 3), withdrawal is initiated by movement of
needle 80 in theproximal direction 12P relative tocatheter 20 andenclosure 50.Proximal orifice 60 is constructed to fit closely to, while still allowing relatively unimpeded travel of,shaft 84. This close fit provides at least two functional benefits. The first benefit is the prevention of escape ofneedle tip 82 fromenclosure 50 in thedirection 12P, since the needle tip cross-section is too great to pass throughproximal orifice 60. The second benefit, as a result of the close fit ofproximal orifice 60 toshaft 84, is a wiping off of body fluids and tissue fromshaft 84 as it passes throughproximal orifice 60. This wiping reduces the medical practitioner's exposure to infectious agents alongshaft 84 by limiting the emission of fluids and tissues that accompanies the withdrawal ofneedle 80. Once theneedle tip 82 has leftcatheter 20,needle tip 82 enterscavity 62. Asenclosure 50 moves distally andneedle 80 simultaneously moves proximally, fluids inspace 90 pass aroundtip 82 and remain withincatheter 20 or exit intovent 74, as a result of the relatively loose fit between the body ofcatheter 20 andneedle 80.Vent cap 91 prevents egress of fluids outsideenclosure 50. This movement of fluids out ofspace 90 during the transition from configuration 1 to configuration 2 minimizes the total fluid held withinenclosure 50 at the completion of catheter insertion. This in turn minimizes the volume of potential contaminants to which the practitioner is exposed. - Upon sufficient movement of the needle proximally into
cavity 62,needle tip 82passes blocking member 66, thereby releasing blockingmember 66. Upon release,member 66 is moved by spring 67 (or other suitable flexible material or structure) to the position shown in FIG. 4 in which it blockscavity 62, thereby trappingtip 82 inenclosure 50. Alternatively, the housinginterior wall 68 may have a recess (not depicted) that the blockingmember 66 fits into for a more secure closure ofcavity 62. The presence ofmember 66 blockingcavity 62 is a barrier to the reemergence ofneedle tip 82. When positioned acrosscavity 62, blockingmember 66 also tends to prevent passage of fluids and tissues fromcavity 62 and vent 74 throughdistal orifice 64. Also during transition from configuration 1 to configuration 2 the total volume of blood contained within the flash chamber ofenclosure 50 has been minimized and positioned distally away from the practitioner, thereby potentially decreasing the likelihood of exposure. The operation ofenclosure 50 is automatic upon removal of theneedle 80 and requires minimal additional or altered actions by the medical practitioner. The movement ofcatheter 20 into the blood vessel following catheter tip placement occurs automatically during proximal movement ofenclosure 50 alongneedle 80. Once entirely removed,needle tip 82 is contained withinenclosure 50, andneedle 80 andenclosure 50 can be discarded without exposing the practitioner to contaminatedneedle tip 82. - Viewed in cross-section along
line 3A-3A in FIG. 3, FIG. 3A shows how the spatial relationships ofcatheter 20 andneedle shaft 84 provide thespace 90. In alternate embodiments (not depicted),shaft 84 may occupy a lesser amount of the cross-sectional area ofcatheter 20. In these embodiments, thespace 90 will be a greater fraction of the cross-sectional area ofcatheter 20, andspace 90 may also extend around the sides or belowneedle shaft 84. - The transverse cross-section of
catheter 20 andneedle 80, as well as the form of theneedle tip 82, can differ both in size and shape in various embodiments. Particular medical applications will preferentially utilize specific configurations, including both symmetrical and asymmetrical structures. The movable transparent flash chambers can also differ in size, shape and topography in various embodiments of the present invention when advantageous. - Referring now to FIGS. 5, a second embodiment of the present invention is partially depicted in cross-section. Significant modifications from the prior embodiment include: the form of a
needle tip 82A, the relation oftip 82A to ashaft 84A, and the form of aproximal face 88A. The disposition ofneedle shaft 84A withinspace 90 is also altered, in part, due to the modified relation oftip 82A toshaft 84A.Needle shaft 84A having the option, as depicted, of a relatively lesser cross-sectional area thanneedle shaft 84 also contributes to its altered disposition withinspace 90. FIG. SA shows both the transverse cross-section ofneedle shaft 84A within thespace 90, and theproximal portion 88A ofneedle tip 82A. The axial position ofneedle shaft 84A is approximately centered in relation to thedistal tip 82A. The embodiment depicted in FIGS. 5 & 5A is well suited for providing an alternative option in medical circumstances, such as pediatric care, where a catheter with alesser width 92 is desirable. - Referring now to FIG. 6, a third embodiment of the present invention is depicted in an increased scale relative to FIG. 5. FIG. 6 shows an
alternative needle tip 82B which is differentiated fromneedle tip 82A of FIGS. 5 & 5A by the presence of aneedle groove 94.Needle groove 94 extends longitudinally through thetip 82B and may also extend along a portion of the length of ashaft 84B, partially seen through agap 96 formed by the sides ofgroove 94 and acatheter 20B.Catheter 20B is identical to thecatheter 20 of the previous embodiments except for a lack ofaperture 34.Groove 94 is of sufficient depth to allow the flow of bodily fluids throughgap 96 between the boundaries ofgroove 94 andcatheter 20B, into theopen space 90. As depicted, the radius ofshaft 84B is greater than is the radius oftip 82B at the bottom ofgroove 94. Alternatively, the bottom ofgroove 94 may reach to a lesser depth (not depicted), such that the radius oftip 82B at the bottom ofgroove 94 is not less than the radius of theshaft 84B. An additional alternative embodiment (not depicted) would continue groove 94 along part or all ofshaft 84B to further increase thespace 90 available for blood flow. Adistal point 98 ofneedle tip 82B is seen to be off-centered, relative to thelongitudinal axis 12. Thedistal point 98 may also be arranged to one side or the other of groove 94 (not depicted) or centered (not depicted) relative to thelongitudinal axis 12. These variations in the disposition ofdistal point 98 may also be optionally employed with any of the other embodiments of the present invention. - A variety of physical mechanisms can serve as the blocking
member 66. Although only one example is depicted herein for illustrative purposes, numerous variations in the construction of the blockingmember 66, variations in the means of biasing towards a blocking position, as well as variations in the means of effecting a blocking action upon needle withdrawal are within the scope of the present invention. The various applicable mechanisms are well known to those of skill in the art, and do not compromise elements essential to the present invention. - In view of the above, it will be seen that the various objects and features of the invention are achieved and other advantageous results obtained. The examples contained herein are merely illustrative and are not intended in a limiting sense.
Claims (32)
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US09/778,201 US6443927B1 (en) | 2001-02-06 | 2001-02-06 | Needle enclosing safety catheter |
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US09/778,201 US6443927B1 (en) | 2001-02-06 | 2001-02-06 | Needle enclosing safety catheter |
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US20020107483A1 true US20020107483A1 (en) | 2002-08-08 |
US6443927B1 US6443927B1 (en) | 2002-09-03 |
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US09/778,201 Expired - Fee Related US6443927B1 (en) | 2001-02-06 | 2001-02-06 | Needle enclosing safety catheter |
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US20030100868A1 (en) * | 2001-03-15 | 2003-05-29 | Ferguson F. Mark | Safety shield for medical needles |
US20030195475A1 (en) * | 2001-03-15 | 2003-10-16 | Ferguson F. Mark | Safety shield for medical needles |
US20040078003A1 (en) * | 2001-03-15 | 2004-04-22 | Smith Daniel K. | Resettable safety shield for medical needles |
US20040092889A1 (en) * | 2002-11-07 | 2004-05-13 | Ferguson F. Mark | Safety shield for medical needles |
US20040133167A1 (en) * | 2001-03-15 | 2004-07-08 | Ferguson F. Mark | Safety shield for medical needles |
US6796962B2 (en) | 2001-03-15 | 2004-09-28 | Specialized Health Products, Inc. | Safety shield for medical needles |
US20050004524A1 (en) * | 2002-06-07 | 2005-01-06 | Becton, Dickinson And Company | Flashback device for venous specimen collection |
US20050015071A1 (en) * | 2002-06-21 | 2005-01-20 | Brimhall Greg L | Method of and apparatus for controlling flashback in an introducer needle and catheter assembly |
US20050059937A1 (en) * | 2001-03-15 | 2005-03-17 | Ferguson F. Mark | Safety shield for medical needles |
US20050075529A1 (en) * | 2003-10-03 | 2005-04-07 | Laust Pedersen | Brachytherapy applicator chuck |
US20050080397A1 (en) * | 2003-10-14 | 2005-04-14 | Altman Sanford D. | Safety dialysis needle/catheter system and method of use |
US6984213B2 (en) | 2001-03-15 | 2006-01-10 | Specialized Health Products, Inc. | Biopsy needle device |
US20060217655A1 (en) * | 2000-03-13 | 2006-09-28 | Vitullo Jeffrey M | Pre-loaded lockable stimulating catheter for delivery of anaesthetic drugs |
US20070106231A1 (en) * | 2003-11-25 | 2007-05-10 | Snow Jeremy K | Resettable safety shield for medical needles |
WO2007142746A1 (en) * | 2006-06-08 | 2007-12-13 | Rishi Baid | Safety device to cover the needle tip of intravenous catheter apparatus |
US7951115B2 (en) | 2003-10-14 | 2011-05-31 | Altman Sanford D | Safety dialysis needle/catheter system and method of use |
USRE43473E1 (en) | 2001-11-13 | 2012-06-12 | Becton, Dickinson And Company | Needle safety device |
US11185668B2 (en) * | 2017-03-06 | 2021-11-30 | Smiths Medical Asd, Inc | Catheter insertion device with tip protector housing |
US11219747B2 (en) | 2017-03-06 | 2022-01-11 | Smiths Medical Asd, Inc. | IV catheter with vein entry indication |
US11439794B2 (en) | 2019-03-07 | 2022-09-13 | Smiths Medical Asd, Inc. | Catheter insertion device with improved flashback response |
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US7988664B2 (en) | 2004-11-01 | 2011-08-02 | Tyco Healthcare Group Lp | Locking clip with trigger bushing |
US7226434B2 (en) | 2003-10-31 | 2007-06-05 | Tyco Healthcare Group Lp | Safety shield |
US7905857B2 (en) | 2005-07-11 | 2011-03-15 | Covidien Ag | Needle assembly including obturator with safety reset |
US7850650B2 (en) | 2005-07-11 | 2010-12-14 | Covidien Ag | Needle safety shield with reset |
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