CA1193508A - Smooth bore double lumen catheter - Google Patents
Smooth bore double lumen catheterInfo
- Publication number
- CA1193508A CA1193508A CA000461963A CA461963A CA1193508A CA 1193508 A CA1193508 A CA 1193508A CA 000461963 A CA000461963 A CA 000461963A CA 461963 A CA461963 A CA 461963A CA 1193508 A CA1193508 A CA 1193508A
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- cylindrical tube
- tube
- lumen
- opening
- cylindrical
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Abstract
ABSTRACT OF THE DISCLOSURE
A double-current catheter having an elongated cylindrical tube for injection and removal of fluid is provided with a smooth conical tapered tip that smoothly merges with the cylindrical surface of the tube so that insertion trauma and the possibility of kinking are minimized. To provide improved dilator characteristics, preferably the tip includes a relative concentration of material for rigidity, the conical taper is gradual and the apex of the conical tip is substantially centered on the axis of the cylindrical tube. To promote fluid flow, the cylindrical tube preferably includes an internal planar divider defining two "D" shaped lumens. A
first lumen extends from the proximal end of the cylindrical tube to a first opening at the distal end, and the second lumen extends from the proximal end to a side opening in the cylindrical surface of the tube. Preferably additional side holes for the lumens are provided to enhance fluid flow.
A double-current catheter having an elongated cylindrical tube for injection and removal of fluid is provided with a smooth conical tapered tip that smoothly merges with the cylindrical surface of the tube so that insertion trauma and the possibility of kinking are minimized. To provide improved dilator characteristics, preferably the tip includes a relative concentration of material for rigidity, the conical taper is gradual and the apex of the conical tip is substantially centered on the axis of the cylindrical tube. To promote fluid flow, the cylindrical tube preferably includes an internal planar divider defining two "D" shaped lumens. A
first lumen extends from the proximal end of the cylindrical tube to a first opening at the distal end, and the second lumen extends from the proximal end to a side opening in the cylindrical surface of the tube. Preferably additional side holes for the lumens are provided to enhance fluid flow.
Description
3~
The present inven-tion relates to surgical instru-ments for withdrawing fluids from or in-troducing fluids into a cavi-ty of the body.
As is well known, a cathe-ter is a tubular, flexible, surgical instrumen-t for withdrawing fluids from (or introduc-ing fluids into) a cavity of the body. A double-current catheter is a catheter having two channels; one for injection and one for removal of fluid. Dorlan's Illus-trated Medical Dictionary Twen-t~-Fif-th Edition (W.B. Saunders, Philadelphia 1974), p. 274. As is well known, a double-current catheter~
is used for removing blood from a fis-tula or vein for process-ing in a dialysis machine and returning the processed blood back to the fis-tula or vein. A double-current cathe-ter suitable for -this purpose is disclosed in Mahurkar, ~.S.
Patent No. 4,134,402 issued January 16, 1979. Mahurkar, ~.S.
Patent No. 4,134,402 discloses^- a double lumen continuous flow hemodialysis needle and cannula having contiguous lumens of different lengths formed by dividing a uni-tary straight tube, the shor-ter lumen acting as a blood intake lumen and the longer ac-ting as a blood return lumen. Semi-circular lumens r~
~1~3~
provide a minimal resistance to blood flow resulting in a smaller but hightly efficient catheter in comparison to a coaxial double-current catheter.
Hemodialysis requires, for example, a blood flow rate of about 200ml/min or more and flow resistance less than about lOOmm of mercury.
There are numerous other United States Patents disclosing double-current catheters for hemodialysis and evidencing a long-felt need for a small, functionally efficient catheter having a minimum of insertion trauma and potPntial for clotting.
McLaughlin, U.S. Patent 4,096,860 issued June 27, 1978 discloses a coaxial hemodialysis catheter said to allow a step enlargement of the opening of a blood vessel to avoid tearing and rupture of the side walls. A simultaneous flow device incorporates a hub with an extensio~ conduit and a valve therein for receipt of a needle therethrough. The extension conduit is of sufficient size to allow the passage of the needle therethrough adjacent the interior side walls thereof with an attendent extension thereof from its opening. The needle with the extension conduit is adapted for combined insertion within a blood vessel, after which it can be withdrawn while the valve prevents the backflow of blood through the axial passage of the hub. A coaxial flow device can then be inserted within the hub conduit.
Sorenson et al., U.S. Patent 4,099,528 issued July 11, 1978 discloses a coaxial double lumen cannula mounted upon a hub and having a central stylet needle for penetrating a patient's vein and which is retractable after penetration.
Grimsrud, U.S. Patent 4,203,436 issued May 20, l9~0 discloses a hollow hypodermic needle with a divider for providin~ a first channel for removal of ~35~
blood for trea-tment from a punctured blood vessel and a second channel for returning the -treated blood -to`the blood vessel.
Uthmann, U.S. Patent NO. 4,385,631 issued May 31, 1983 discloses a hemodialysis catheter for puncturing blood vessels which includes a section insertable through a punc-ture opening into a blood vessel and a hose line following thereaf-ter.
Jacobson et al., U.S. Pa-tent No. ~,180,068 issued December 25, 1979 discloses a double-current hemodialysis catheter comprising a primary tube and an in-ternal divider wh:ich also functions as a trocar and valve. The primary tube has a side opening for receiving blood and a central open-ing at the distal end of the primary tube. The internal divider includes a cutting end which protrudes from the dis-tal opening when -the divider is longitudinally moved to an insert position. In the insert position, blood flow is blocked.
Mahurkar, U.S. Design Patent No. 272,651 issued February 1~, 198~ discloses a double lumen catheter having an outlet lumen which has an opening a-t the tip of the ca-theter and a shor-ter inlet lumen which terminates in a bevel sub-stantially displaced from the tip.
The present inven-tion provides an efficient dual lumen catheter having minimal insertion trauma and a minimal potential for clotting.
The present invention also provides a dual lumen cathether which is an effective dilator for soft tissue and velns.
In accordance with the invention, a dual lumen 35C~ ~
catheter has a smoo-th conical tapered tip that smoothly mer-ges with the catheter body so that insertion of the catheter is Eacilitated. The catheter also has a uniform diameter along its entire length from its proximal end to the conical tapered tip. The tip guidance poin-t is located at the cen-ter of the conical tip for uniform distribution oE frictional resistance and minimization of insertion trauma and kinking.
The conical tapered tip comprises a rela-tive concentration of material to impart relative rigidity so that the tip func-tions as an effective dilator for soft tissue and veins.
Semicircular lumens insure non-static laminar flow and pre-vent clo-tting. I`he smooth bore double lumen ca-the-ter is particularly advan-tageous when a -tunneling procedure or blind technique must be used, for example, to reach a vein under the collar bone or neck.
The present invention will be fur-ther illustra-ted by way of the accompanying drawings, in which:-Fig. 1 is a front elevational view of a smooth bore double lumen ca-theter according to the present inven--tion;
Fig. 2 is a right side elevational view of the smooth bore double lumen catheter illustra-ted in Fig. li F'ig. 3 is a rear elevatlonal view of the smoo-th bore double lumen catheter illustrated in Fig. l;
F'ig. 4 :is a leEt side elevational view of the smooth bore double lumen catheter illustrated in F'ig. l;
F:ig. 5 is a bottom view of the smooth bore double lumen catheter il]ustrated in Fig. l;
FIG. 6 is a view in section of the smooth bore double lumen catheter illustrated in FIG. 1 taken along line 6~6 thereof; and FIG. 7 is a view in section of the smooth bore double lumen catheter illustrated in FIG. 1 taken along long 7-7 shown in FIG. 2.
Turning now to the drawings, FIGs. 1-5 show the various external views of a smooth bore double lumen catheter, generally designated 10, in accordance with the present invention. As is conventional for a double-current catheter, the double lumen catheter 10 has a elongated hollow tube 11 which is inserted into a cavity of the body such as a fistula or vein. The tube 11 is circular in cross section, as specifically shown in FIG. 6, and has an internal divider 12 definlng a return lumen 13 and an inlet lumen 14 within the interior of the hollow tube 11. The 1~
lumens 13 and 14 are semicircular or "D" shaped which ,`
minimizes resistance to fluid flow. As is conventional for this type of dual lumen construction, the divider 12 extends axially along the tube 11 from a branching connector 15. The branching connector 15 connects the distal end portions of the return lumen 13 and the inlet lumen 14 to respective fluid return and inlet lines 16 and ,~
~i :
~935~
17 which are, for example, respective venous and arterial lines of a dialysis circult. This preferred direction of fluid circula~ion is indicated by heavy arrows in FIGs. 1 and 3. The branching conneckor 15 includes a coaxial sleeve 15' at the junction of the tube 11 and the connector 15. The sleeve 15' acts as a strain relief and also prevents kinking of the tube 11 at the junction.
The hollow tube 11 includes openings or apertures at the distal end portions of the lumens 13, 14 to permit the flow of fluid between a body cavity ~not shown) and the lumens. The return lumen 13 extends along the entire length of the tube 11 to an aperture or opening 18 at the distal end or tip of the tube 11 as is more clearly shown in FIG. 7. The inlet lumen 14 is shorter than the return lumen 13 and terminates at its distal end at an aperture or opening 19 that is in the side of the tube 11 and is substantially displaced from the aperture 18 at the distal end of the tube 11.
In accordance with the invention, the distal end portion of the tube 11 has a conical tip generally desiynated 20 which smoothly merges with the cylindrical body of the tube 11~ Preferably the apex of the conical tip 20 is centered on the axis of the cylindrical body of the tube 11 thus serving as a guidance point to uniformly distribute the frictional resistance encountered by the conical tip 20 when the tube 11 is inserted into the body cavity (not shown). As shown in FIGS. 1-4 and FIG. 7, the outer diameter of the tube 11 converges smoothly at the distal end portion of the tube defining a tr,uncated cone 20 and the return lumen 13 opens at the truncated apex of the cone 18. Preferably, the conical tip 20 has a gradual taper. The conical tip ~133~
20, for example, has a length of at least approximately two diameters of the tube 11. Since the frictional resistance is uniformly distributed and the conical tip 20 smoothly merges with the body of the tube 11, inserti.on trauma and kinking are minimized.
The relatively small size of the return and inlet apertures 18, 19 further reduce insertion trauma, but they also impede fluid flow. Therefore, an additional group of holes or apertures generally designated 21 connect the return lumen 13 to the outer surface of the tube 11, and an additional group of holes or apertures 22 connect the inlet lumen 14 to the outer surface of the tube 11. Viewed from the side, the holes 21, 22 are seen to have scaphoid margins. In particular the return holes or apertures 21 are axially disposed between the base of the conical tip 20 and the inlet aperture 19 at the distal end of the inlet lumen 14. The additional inlet holes or apertures 22 are axially disposed between the inlet aperture 19 and the proximal end of the tube 11. The return holes 21 and the inlet holes 22 are further disposed circumferentially on opposite s.ides of the divider 12. Thus, there is axial as well as circumferential separation of the inlets and outlets for fluid circulation.
In accordance with another aspec-t of the invention speci~ically shown in FIG. 7, the conical tip generally designated 20 is formed with a relative concentration of material 23 to stiffen the tip 20.
This stiffening aids penetration of the tip 20 into the body cavity (not shown) and also aids the dilation of soft tissue such as veins. As shown in FIG. 7, the lnlet lumen 14 terminates at the inlet aperture 19 and in place of the inlet lumen the 5~
relative concentration of material 23 extends axially from the aperture 19 to the distal end of the tube 11 at the truncated apex of the conical tip 20. ~lso, the wall thickness of the conical tip 20, the reurn lumen 13 and the~aperture 18 are all eccentric to the axis of the conical tip.
It is readily apparent to persons of ordinary skill in the art that the tip 20 as shown in FIG. 7 is easily formed from thermo-plastic material. The tip 20 including the relative concentration of material 23 is easily molded and bonded or is integrally formed from the cylindrical tube 11 by the use of internal and external mandrels and the application of heat by any number of conventional means such as RF forming, thermal forming, or infra-red forming.
For use in hemodialysis, the smooth bore double lumen catheter 10 is introduced in the direction of blood flow in a large vein over a hypodemic needle or Seldinger's guide wire, or throuyh a sheath as is conventional. The side holes 19 and 22 on the blood inlet lumen 14 draw the blood for processing and the processed blood is returned through the return lumen 13 and out through the holes 18, Zl to return the blood upstream into circulation. As was described above, the geometrical properties of the smooth bore double lumen catheter as shown in the drawing figures insure that insertion trauma, kinking, and the possibility of clotting are minimized during hemodialysis.
The present inven-tion relates to surgical instru-ments for withdrawing fluids from or in-troducing fluids into a cavi-ty of the body.
As is well known, a cathe-ter is a tubular, flexible, surgical instrumen-t for withdrawing fluids from (or introduc-ing fluids into) a cavity of the body. A double-current catheter is a catheter having two channels; one for injection and one for removal of fluid. Dorlan's Illus-trated Medical Dictionary Twen-t~-Fif-th Edition (W.B. Saunders, Philadelphia 1974), p. 274. As is well known, a double-current catheter~
is used for removing blood from a fis-tula or vein for process-ing in a dialysis machine and returning the processed blood back to the fis-tula or vein. A double-current cathe-ter suitable for -this purpose is disclosed in Mahurkar, ~.S.
Patent No. 4,134,402 issued January 16, 1979. Mahurkar, ~.S.
Patent No. 4,134,402 discloses^- a double lumen continuous flow hemodialysis needle and cannula having contiguous lumens of different lengths formed by dividing a uni-tary straight tube, the shor-ter lumen acting as a blood intake lumen and the longer ac-ting as a blood return lumen. Semi-circular lumens r~
~1~3~
provide a minimal resistance to blood flow resulting in a smaller but hightly efficient catheter in comparison to a coaxial double-current catheter.
Hemodialysis requires, for example, a blood flow rate of about 200ml/min or more and flow resistance less than about lOOmm of mercury.
There are numerous other United States Patents disclosing double-current catheters for hemodialysis and evidencing a long-felt need for a small, functionally efficient catheter having a minimum of insertion trauma and potPntial for clotting.
McLaughlin, U.S. Patent 4,096,860 issued June 27, 1978 discloses a coaxial hemodialysis catheter said to allow a step enlargement of the opening of a blood vessel to avoid tearing and rupture of the side walls. A simultaneous flow device incorporates a hub with an extensio~ conduit and a valve therein for receipt of a needle therethrough. The extension conduit is of sufficient size to allow the passage of the needle therethrough adjacent the interior side walls thereof with an attendent extension thereof from its opening. The needle with the extension conduit is adapted for combined insertion within a blood vessel, after which it can be withdrawn while the valve prevents the backflow of blood through the axial passage of the hub. A coaxial flow device can then be inserted within the hub conduit.
Sorenson et al., U.S. Patent 4,099,528 issued July 11, 1978 discloses a coaxial double lumen cannula mounted upon a hub and having a central stylet needle for penetrating a patient's vein and which is retractable after penetration.
Grimsrud, U.S. Patent 4,203,436 issued May 20, l9~0 discloses a hollow hypodermic needle with a divider for providin~ a first channel for removal of ~35~
blood for trea-tment from a punctured blood vessel and a second channel for returning the -treated blood -to`the blood vessel.
Uthmann, U.S. Patent NO. 4,385,631 issued May 31, 1983 discloses a hemodialysis catheter for puncturing blood vessels which includes a section insertable through a punc-ture opening into a blood vessel and a hose line following thereaf-ter.
Jacobson et al., U.S. Pa-tent No. ~,180,068 issued December 25, 1979 discloses a double-current hemodialysis catheter comprising a primary tube and an in-ternal divider wh:ich also functions as a trocar and valve. The primary tube has a side opening for receiving blood and a central open-ing at the distal end of the primary tube. The internal divider includes a cutting end which protrudes from the dis-tal opening when -the divider is longitudinally moved to an insert position. In the insert position, blood flow is blocked.
Mahurkar, U.S. Design Patent No. 272,651 issued February 1~, 198~ discloses a double lumen catheter having an outlet lumen which has an opening a-t the tip of the ca-theter and a shor-ter inlet lumen which terminates in a bevel sub-stantially displaced from the tip.
The present inven-tion provides an efficient dual lumen catheter having minimal insertion trauma and a minimal potential for clotting.
The present invention also provides a dual lumen cathether which is an effective dilator for soft tissue and velns.
In accordance with the invention, a dual lumen 35C~ ~
catheter has a smoo-th conical tapered tip that smoothly mer-ges with the catheter body so that insertion of the catheter is Eacilitated. The catheter also has a uniform diameter along its entire length from its proximal end to the conical tapered tip. The tip guidance poin-t is located at the cen-ter of the conical tip for uniform distribution oE frictional resistance and minimization of insertion trauma and kinking.
The conical tapered tip comprises a rela-tive concentration of material to impart relative rigidity so that the tip func-tions as an effective dilator for soft tissue and veins.
Semicircular lumens insure non-static laminar flow and pre-vent clo-tting. I`he smooth bore double lumen ca-the-ter is particularly advan-tageous when a -tunneling procedure or blind technique must be used, for example, to reach a vein under the collar bone or neck.
The present invention will be fur-ther illustra-ted by way of the accompanying drawings, in which:-Fig. 1 is a front elevational view of a smooth bore double lumen ca-theter according to the present inven--tion;
Fig. 2 is a right side elevational view of the smooth bore double lumen catheter illustra-ted in Fig. li F'ig. 3 is a rear elevatlonal view of the smoo-th bore double lumen catheter illustrated in Fig. l;
F'ig. 4 :is a leEt side elevational view of the smooth bore double lumen catheter illustrated in F'ig. l;
F:ig. 5 is a bottom view of the smooth bore double lumen catheter il]ustrated in Fig. l;
FIG. 6 is a view in section of the smooth bore double lumen catheter illustrated in FIG. 1 taken along line 6~6 thereof; and FIG. 7 is a view in section of the smooth bore double lumen catheter illustrated in FIG. 1 taken along long 7-7 shown in FIG. 2.
Turning now to the drawings, FIGs. 1-5 show the various external views of a smooth bore double lumen catheter, generally designated 10, in accordance with the present invention. As is conventional for a double-current catheter, the double lumen catheter 10 has a elongated hollow tube 11 which is inserted into a cavity of the body such as a fistula or vein. The tube 11 is circular in cross section, as specifically shown in FIG. 6, and has an internal divider 12 definlng a return lumen 13 and an inlet lumen 14 within the interior of the hollow tube 11. The 1~
lumens 13 and 14 are semicircular or "D" shaped which ,`
minimizes resistance to fluid flow. As is conventional for this type of dual lumen construction, the divider 12 extends axially along the tube 11 from a branching connector 15. The branching connector 15 connects the distal end portions of the return lumen 13 and the inlet lumen 14 to respective fluid return and inlet lines 16 and ,~
~i :
~935~
17 which are, for example, respective venous and arterial lines of a dialysis circult. This preferred direction of fluid circula~ion is indicated by heavy arrows in FIGs. 1 and 3. The branching conneckor 15 includes a coaxial sleeve 15' at the junction of the tube 11 and the connector 15. The sleeve 15' acts as a strain relief and also prevents kinking of the tube 11 at the junction.
The hollow tube 11 includes openings or apertures at the distal end portions of the lumens 13, 14 to permit the flow of fluid between a body cavity ~not shown) and the lumens. The return lumen 13 extends along the entire length of the tube 11 to an aperture or opening 18 at the distal end or tip of the tube 11 as is more clearly shown in FIG. 7. The inlet lumen 14 is shorter than the return lumen 13 and terminates at its distal end at an aperture or opening 19 that is in the side of the tube 11 and is substantially displaced from the aperture 18 at the distal end of the tube 11.
In accordance with the invention, the distal end portion of the tube 11 has a conical tip generally desiynated 20 which smoothly merges with the cylindrical body of the tube 11~ Preferably the apex of the conical tip 20 is centered on the axis of the cylindrical body of the tube 11 thus serving as a guidance point to uniformly distribute the frictional resistance encountered by the conical tip 20 when the tube 11 is inserted into the body cavity (not shown). As shown in FIGS. 1-4 and FIG. 7, the outer diameter of the tube 11 converges smoothly at the distal end portion of the tube defining a tr,uncated cone 20 and the return lumen 13 opens at the truncated apex of the cone 18. Preferably, the conical tip 20 has a gradual taper. The conical tip ~133~
20, for example, has a length of at least approximately two diameters of the tube 11. Since the frictional resistance is uniformly distributed and the conical tip 20 smoothly merges with the body of the tube 11, inserti.on trauma and kinking are minimized.
The relatively small size of the return and inlet apertures 18, 19 further reduce insertion trauma, but they also impede fluid flow. Therefore, an additional group of holes or apertures generally designated 21 connect the return lumen 13 to the outer surface of the tube 11, and an additional group of holes or apertures 22 connect the inlet lumen 14 to the outer surface of the tube 11. Viewed from the side, the holes 21, 22 are seen to have scaphoid margins. In particular the return holes or apertures 21 are axially disposed between the base of the conical tip 20 and the inlet aperture 19 at the distal end of the inlet lumen 14. The additional inlet holes or apertures 22 are axially disposed between the inlet aperture 19 and the proximal end of the tube 11. The return holes 21 and the inlet holes 22 are further disposed circumferentially on opposite s.ides of the divider 12. Thus, there is axial as well as circumferential separation of the inlets and outlets for fluid circulation.
In accordance with another aspec-t of the invention speci~ically shown in FIG. 7, the conical tip generally designated 20 is formed with a relative concentration of material 23 to stiffen the tip 20.
This stiffening aids penetration of the tip 20 into the body cavity (not shown) and also aids the dilation of soft tissue such as veins. As shown in FIG. 7, the lnlet lumen 14 terminates at the inlet aperture 19 and in place of the inlet lumen the 5~
relative concentration of material 23 extends axially from the aperture 19 to the distal end of the tube 11 at the truncated apex of the conical tip 20. ~lso, the wall thickness of the conical tip 20, the reurn lumen 13 and the~aperture 18 are all eccentric to the axis of the conical tip.
It is readily apparent to persons of ordinary skill in the art that the tip 20 as shown in FIG. 7 is easily formed from thermo-plastic material. The tip 20 including the relative concentration of material 23 is easily molded and bonded or is integrally formed from the cylindrical tube 11 by the use of internal and external mandrels and the application of heat by any number of conventional means such as RF forming, thermal forming, or infra-red forming.
For use in hemodialysis, the smooth bore double lumen catheter 10 is introduced in the direction of blood flow in a large vein over a hypodemic needle or Seldinger's guide wire, or throuyh a sheath as is conventional. The side holes 19 and 22 on the blood inlet lumen 14 draw the blood for processing and the processed blood is returned through the return lumen 13 and out through the holes 18, Zl to return the blood upstream into circulation. As was described above, the geometrical properties of the smooth bore double lumen catheter as shown in the drawing figures insure that insertion trauma, kinking, and the possibility of clotting are minimized during hemodialysis.
Claims (26)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A double lumen catheter having an elongated cylindrical tube enclosing first and second lumens, the proximal end of said cylindrical tube connecting to two separate tubes communicating with the respective first and second lumens for the injection and removal of fluid, the first lumen extending from the proximal end of said cylindri-cal tube to an opening at the distal end of said cylindrical tube, and the second lumen extending from the proximal end of said cylindrical tube to at least one opening in the side of the cylindrical surface of said cylindrical tube, wherein the improvement comprises; said cylindrical tube having at its distal end a smooth conical tapered tip that smoothly merges with the cylindrical surface of said cylindrical tube, and having a uniform diameter along its entire length from its proximal end to said conical tapered tip.
2. The double lumen catheter as claimed in claim 1, wherein the cylindrical surface of said cylindrical tube includes at least one opening to said first lumen axially spaced between the opening to said second lumen and said conical. tapered tip, and circumferentially disposed on the side of said cylindrical tube opposite said opening to said second lumen.
3. The double lumen catheter as claimed in claim 1, wherein the cylindrical surface of said cylindrical tube includes a plurality of holes exposing said first lumen that are axially spaced between the opening to said second lumen and said conical tapered tip, and circumferentially disposed on the side of said cylindrical tube opposite said opening to said second lumen.
4. The double lumen catheter as claimed in claim 1, wherein an internal planar divider in said cylindrical tube separates said first and second lumens, and the cylin-drical surface of said cylindrical tube includes at least one side hole exposing said second lumen that is axially spaced between the opening to said second lumen and the proximal end of said cylindrical tube and is circumferentially disposed on the same side of the cylindrical tube as the opening to said second lumen, and the cylindrical surface of said cylindrical tube includes at least one side hole exposing said first lumen axially spaced between said opening to said second lumen and said conical tapered tip, and circumferentially disposed on the opposite side of said cylindrical tube as said opening to said second lumen.
5. The double lumen catheter as claimed in claim 1, wherein said conical tapered tip comprises a concentration of material substantially exceeding the concentration of material in the cylindrical body of said cylindrical tube.
6. The double lumen catheter as claimed in claim 1, wherein said cylindrical tube comprises a relative concentration of material extending axially from said opening in the side of said cylindrical surface of said cylindrical tube to the distal end of said cylindrical tube.
7. The double lumen catheter as claimed in claim 1, wherein said cylindrical tube has an internal planar divider bisecting said cylindrical tube into said first and second lumens, said second lumen terminates at said opening in the side of said cylindrical surface of said cylindrical tube, and a relative concentration of material extends axially from said opening in the side of said cylindrical surface of said cylindrical tube to the distal end of said cylindrical tube.
8. The double lumen catheter as claimed in claim 1, wherein the apex of said conical tip is substantially aligned with the axis of said cylindrical tube.
9. The double lumen catheter as claimed in claim 1, wherein the length of said conical tip is at least approximately two diameters of said cylindrical tube.
10. The double lumen catheter as claimed in claim 1, wherein the first and second lumens are semicircular.
11. The double lumen catheter as claimed in claim 1, wherein the proximal end of said cylindrical tube is connected to said separate tubes by a connector including a sleeve coaxial with said cylindrical tube at the junction of the coaxial tube and the connector.
12. A double lumen catheter as claimed in claim 1, wherein the opening at the distal end of said cylindrical tube is eccentric with respect to the axis of the conical tapered tip.
13. The double lumen catheter as claimed in claim 1, wherein the wall thickness of the conical tapered tip is eccentric with respect to the axis of the conical tapered tip.
14. A double lumen catheter comprising an elongated cylindrical tube including a planar axial divider bisecting said cylindrical tube into first and second lumens, the proximal end of said cylindrical tube connecting two separate tubes communicating with the respective first and second lumens for the injection and removal of fluid, the first lumen extending from the proximal end of said cylindrical tube to a first opening at the distal end of said cylindrical tube, the second lumen extending from the proximal end of said cylindrical tube to a second opening in the side of the cylindrical surface of said cylindrical tube, said second lumen terminating at said second opening and a relative concentration of material extending axially from the second opening to the distal end of said cylindrical tube, the distal end of said cylindrical tube having a smooth conical tapered tip that smoothly merges with the cylindrical surface of said cylindrical tube, the cylindrical surface of said cylindrical tube having at least one side hole exposing said first lumen axially spaced between said second opening and said conical tapered tip and circumferentially disposed on the opposite side of said cylindrical tube as said second opening, and the cylindrical surface of said cylindrical tube having at least one side hole exposing said second lumen axially spaced between said second opening and the proximal end of said cylindrical tube and circumferentially disposed on the same side of said cylindrical tube as said second opening.
15. The double lumen catheter as claimed in claim 14, wherein the apex of said conical tip is substantially aligned with the axis of said cylindrical tube.
16. The double lumen catheter as claimed in claim 14, wherein the length of said conical tip is at least approximately two diameters of said cylindrical tube.
17. The double lumen catheter as claimed in claim 14, wherein the first opening in the distal end of said cylindrical tube is eccentric with respect to the axis of the conical tapered tip.
18. The double lumen catheter as claimed in claim 14, wherein the wall thickness of the conical tapered tip is eccentric with respect to the axis of the conical tapered tip.
19. The double lumen catheter as claimed in claim 14, wherein the first and second lumens are semicircular.
20. The double lumen catheter as claimed in claim 14, wherein the proximal end of said cylindrical tube is connected to said separate tubes by a connector including a sleeve coaxial with said cylindrical tube at the junction of the connector and said cylindrical tube.
21. A double lumen catheter comprising an elonga-ted unitary tube including an integral internal divider extending axially along the entire length of the tube and dividing said tube into a first and a second lumen, the outer circumference of said tube converging smoothly at the distal end portion of said tube defining a truncated cone, the first lumen opening at the truncated apex of said cone, and the second lumen being shorter in axial length than the first lumen and opening upon the outer circumference of said tube, said tube having a uniform diameter from its distal end portion to proximally beyond the opening of the second lumen upon the outer circumference.
22. The double lumen catheter as claimed in claim 21, wherein the first lumen is eccentric to the axis of said cone.
23. The double lumen catheter as claimed in claim 21, wherein said second lumen opens upon the outer circum-ference of said tube at a plurality of openings having scaphoid margins.
24. The double lumen catheter as claimed in claim 21, wherein said first lumen also opens upon the outer dia-meter of said tube at a first plurality of holes located between the proximal end of said tube and the base of said cone, and said second lumen opens upon the outer diameter of said tube at a second plurality of holes located between said first plurality of holes and the proximal end of said tube.
25. The double lumen catheter as claimed in claim 21, wherein said first and second lumens are semicircular.
26. The double lumen catheter as claimed in claim 21, further comprising a branching connector at the proximal end of said tube including a sleeve coaxial with said tube at the junction of said tube and the branching connector.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US641,187 | 1984-08-15 | ||
| US06/641,187 US4583968A (en) | 1983-10-03 | 1984-08-15 | Smooth bore double lumen catheter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1193508A true CA1193508A (en) | 1985-09-17 |
Family
ID=24571301
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000461963A Expired CA1193508A (en) | 1984-08-15 | 1984-08-28 | Smooth bore double lumen catheter |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1193508A (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5221255A (en) | 1990-01-10 | 1993-06-22 | Mahurkar Sakharam D | Reinforced multiple lumen catheter |
| US5374245A (en) | 1990-01-10 | 1994-12-20 | Mahurkar; Sakharam D. | Reinforced multiple-lumen catheter and apparatus and method for making the same |
| US5486159A (en) * | 1993-10-01 | 1996-01-23 | Mahurkar; Sakharam D. | Multiple-lumen catheter |
| US6146354A (en) * | 1996-05-24 | 2000-11-14 | Horizon Medical Products | Asymmetrical multi-lumen apheresis catheter with balanced flow rates |
| US6280423B1 (en) | 1998-02-24 | 2001-08-28 | Scimed Life Systems, Inc. | High flow rate dialysis catheters and related methods |
| US6332892B1 (en) | 1999-03-02 | 2001-12-25 | Scimed Life Systems, Inc. | Medical device with one or more helical coils |
| US6620202B2 (en) | 2001-10-16 | 2003-09-16 | Scimed Life Systems, Inc. | Medical stent with variable coil and related methods |
| US6656146B1 (en) | 1995-11-07 | 2003-12-02 | Scimed Life Systems, Inc. | Medical device with tail(s) |
| US6695832B2 (en) | 2000-06-01 | 2004-02-24 | Twincath, Llc | Multilumen catheter and methods for making the catheter |
| US6719749B1 (en) | 2000-06-01 | 2004-04-13 | Medical Components, Inc. | Multilumen catheter assembly and methods for making and inserting the same |
| US7678154B2 (en) | 1995-11-07 | 2010-03-16 | Boston Scientific Scimed, Inc. | Ureteral stent for improved patient comfort |
| US7951206B2 (en) | 2001-04-02 | 2011-05-31 | Boston Scientific Scimed, Inc. | Medical stent |
-
1984
- 1984-08-28 CA CA000461963A patent/CA1193508A/en not_active Expired
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5374245A (en) | 1990-01-10 | 1994-12-20 | Mahurkar; Sakharam D. | Reinforced multiple-lumen catheter and apparatus and method for making the same |
| US5221255A (en) | 1990-01-10 | 1993-06-22 | Mahurkar Sakharam D | Reinforced multiple lumen catheter |
| US5486159A (en) * | 1993-10-01 | 1996-01-23 | Mahurkar; Sakharam D. | Multiple-lumen catheter |
| US6656146B1 (en) | 1995-11-07 | 2003-12-02 | Scimed Life Systems, Inc. | Medical device with tail(s) |
| US8845752B2 (en) | 1995-11-07 | 2014-09-30 | Boston Scientific Scimed, Inc. | Ureteral stent for improved patient comfort |
| US7678154B2 (en) | 1995-11-07 | 2010-03-16 | Boston Scientific Scimed, Inc. | Ureteral stent for improved patient comfort |
| US6146354A (en) * | 1996-05-24 | 2000-11-14 | Horizon Medical Products | Asymmetrical multi-lumen apheresis catheter with balanced flow rates |
| US6280423B1 (en) | 1998-02-24 | 2001-08-28 | Scimed Life Systems, Inc. | High flow rate dialysis catheters and related methods |
| US6595966B2 (en) | 1998-02-24 | 2003-07-22 | Scimed Life Systems, Inc. | High flow rate dialysis catheters and related methods |
| US6332892B1 (en) | 1999-03-02 | 2001-12-25 | Scimed Life Systems, Inc. | Medical device with one or more helical coils |
| US6695832B2 (en) | 2000-06-01 | 2004-02-24 | Twincath, Llc | Multilumen catheter and methods for making the catheter |
| US6719749B1 (en) | 2000-06-01 | 2004-04-13 | Medical Components, Inc. | Multilumen catheter assembly and methods for making and inserting the same |
| US6881211B2 (en) | 2000-06-01 | 2005-04-19 | Medical Components, Inc. | Multilumen catheter assembly and methods for making and inserting the same |
| US7018374B2 (en) | 2000-06-01 | 2006-03-28 | Medical Components, Inc. | Splittable multilumen catheter assembly |
| USRE40913E1 (en) * | 2000-06-01 | 2009-09-08 | Medical Components, Inc. | Multilumen catheter assembly and methods for making and inserting the same |
| US7981093B2 (en) | 2000-06-01 | 2011-07-19 | Medical Components, Inc. | Methods of making a multilumen catheter assembly |
| US11058849B2 (en) | 2000-06-01 | 2021-07-13 | Medical Components, Inc. | Multi-lumen catheter |
| US7951206B2 (en) | 2001-04-02 | 2011-05-31 | Boston Scientific Scimed, Inc. | Medical stent |
| US6620202B2 (en) | 2001-10-16 | 2003-09-16 | Scimed Life Systems, Inc. | Medical stent with variable coil and related methods |
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