Squitieri hemodialysis and vascular access systems
First Claim
1. A hemodialysis and vascular access system wherein:
- said system comprises a first portion comprising a tube and a second portion comprising a catheter and wherein;
said tube is provided from a material which can be sutured to the artery with a first end of said tube adapted to be coupled to an artery; and
said catheter is adapted to be inserted within a vein at an insertion site, with a first end of the catheter having an opening adapted to be within the vein itself and wherein the opening in the first end of said catheter is distant from the insertion site and said tube and said catheter being adapted to be entirely subcutaneous in use and configured to avoid, in use, a reservoir therein.
3 Assignments
0 Petitions
Accused Products
Abstract
A hemodialysis and vascular access system comprises a subcutaneous composite PTFE silastic arteriovenous fistula having an indwelling silastic venous end which is inserted percutaneously into a vein and a PTFE arterial end which is anastomosed to an artery. Access to a blood stream within the system is gained by direct puncture of needle(s) into a needle receiving site having a tubular passage within a metal or plastic frame and a silicone upper surface through which needle(s) are inserted. In an alternate embodiment of the invention, percutaneous access to a blood stream may be gained by placing needles directly into the system (i.e. into the PTFE arterial end). The invention also proposes an additional embodiment having an arterialized indwelling venous catheter where blood flows from an artery through a tube and a port into an arterial reservoir and is returned to a vein via a port and a venous outlet tube distinct and distant from the area where the blood from the artery enters the arterial reservoir. The site where blood is returned to the vein is not directly fixed to the venous wall but is free floating within the vein. This system provides a hemodialysis and venous access graft which has superior longevity and performance, is easier to implant and is much more user friendly.
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Citations
46 Claims
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1. A hemodialysis and vascular access system wherein:
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said system comprises a first portion comprising a tube and a second portion comprising a catheter and wherein;
said tube is provided from a material which can be sutured to the artery with a first end of said tube adapted to be coupled to an artery; and
said catheter is adapted to be inserted within a vein at an insertion site, with a first end of the catheter having an opening adapted to be within the vein itself and wherein the opening in the first end of said catheter is distant from the insertion site and said tube and said catheter being adapted to be entirely subcutaneous in use and configured to avoid, in use, a reservoir therein. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 23, 24, 25, 26)
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17. A hemodialysis and vascular access system to shunt blood between a vein and an artery, said system having a single lumen comprising:
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a tube having first and second ends, said first end adapted to be anastomosed to said artery; and
a catheter, comprising tubing having a first end and a second end, said second end being connected to said second end of said tube;
said catheter having a site for entering said vein, said site being away from said first end of said catheter so that, in use, said first end can be located downstream in said vein;
and needle receiving sites between said first end of said tube and said first end of said catheter;
said tube and said catheter being adapted to be entirely subcutaneous in use and configured to avoid, in use, a blood reservoir therein and to provide continuous blood flow. - View Dependent Claims (18, 19, 20, 21, 22, 27, 28, 29, 30, 31)
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32. A hemodialysis and vascular access system, comprising:
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an arterialized indwelling venous catheter having a first portion provided from a material which is biocompatible with an arterial system, has a nonthrombogenic characteristic, which is adapted for attachment to an arterial system and a catheter section, with a first end of said first portion adapted to be coupled to an arterial system and a portion of the catheter section adapted to be inserted within a venous system at an insertion site, said catheter section portion having an outside diameter which is less than an inner diameter of the venous system and having at least one opening in an end thereof with at least one of the at least one openings in the catheter section portion adapted to be within the venous system itself and wherein the at least one opening is distant from the insertion site such that, in operation, blood flows from the arterial system through the catheter and is returned to the venous system through the at least one opening and blood also flows through the vein uninterrupted around at least an outer portion of said catheter; and
at least one needle having a first end coupled to a hemodialysis device and having a second end adapted for insertion directly into the arterialized indwelling venous catheter to shunt the blood flow through the dialysis device. - View Dependent Claims (33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46)
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Specification