Biodegradable stent
First Claim
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1. A biodegradable, biocompatible, resorbable, ureteral stent having retaining means to prevent migration from a predetermined position in the ureter, said stent comprising a terpolymer of:
- (a) L(-) lactide(b) glycolide, and(c) epsilon-caprolactone.
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Abstract
A biodegradable, biocompatible, resorbable infusion stent comprising a terpolymer of:
(a) L(-)lactide,
(b) glycolide, and
(c) epsilon-caprolactone.
This invention includes a method for treating ureteral obstructions or impairments by utilizing a biodegradable, biocompatible, resorbable infusion stent, and a method for controlling the speed of resorption of the stent.
630 Citations
32 Claims
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1. A biodegradable, biocompatible, resorbable, ureteral stent having retaining means to prevent migration from a predetermined position in the ureter, said stent comprising a terpolymer of:
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(a) L(-) lactide (b) glycolide, and (c) epsilon-caprolactone. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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- 16. A method for treating ureteral obstruction or impairment in a mammalian host by inserting in the ureter in a predetermined location, a biodegradable, biocompatible resorbable non-anastomosis polymeris stent extending between the kidney and the bladder, said stent having end portions with pliable retaining means to prevent migration before biodegradation, without the need for suturing, from the predetermined location in the ureter.
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25. A method for controlling the time of biodegradation in the ureter of a polymeric, biodegradable, biocompatible, resorbable non-anastomosis ureteral stent by
(a) inserting a stent in the ureter in a predetermined location between the kidney and the bladder to relieve ureteral obstruction; -
(b) providing end portions of the stent with pliable retaining means to prevent migration of the stent before biodegradation, without the need for suturing; and (c) controlling the rate of biodegradation of said polymeric stent from a few weeks to a few months, by varying the molecular weight of the polymer composition comprising the stent, from a weight average molecular weight of about 20,000 to about 1,000,000. - View Dependent Claims (21, 22, 23, 24, 26, 27, 28, 29, 30)
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31. A method for relieving ureteral obstruction in a mammalian host, comprising:
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(a) forming a tubular polymeric, biodegradable, biocompatible resorbable non-anastomosis ureteral stent having end portions with pliable retaining means to prevent migration before biodegradation, without the need for suturing, from a predetermined position in the ureter, and wherein said stent substantially extends from the kidney to the bladder; (b) controlling the rate of biodegradation of said polymeric stent by varying the molecular weight of the polymer composition comprising the stent, from a weight average molecular weight of about 50,000 to about 1,000,000, and (c) inserting said positioning said ureteral stent in the ureter in a predetermined location between the kidney and the bladder. - View Dependent Claims (32)
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Specification