Isomorphic copolyoxalates and sutures thereof
First Claim
1. A synthetic absorbable suture of oriented fiber comprising an isomorphic polyoxalate polymer consisting essentially of units of cyclic and linear oxalates and having the general formula ##STR2## wherein each R is
or
space="preserve" listing-type="equation">'"'"'(CH.sub.2).sub.4+2n -- IIand from about 5 to 95 mol percent of the R units are I;
A is trans 1,4-cyclohexylene or p-phenylene, n is 1 or 2 and is the same for I and II, and x is the degree of polymerization resulting in a fiber forming polymer having a molecular weight greater than about 10,000.
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Abstract
Synthetic absorbable sutures are prepared from copolyoxalate polymers having isomorphic sequences. The polymers are derived from mixtures of cyclic and linear diols, each having the same carbon chain length of 6 or 8 atoms. The cyclic diol may be aliphatic or aromatic. The diols are polymerized with dialkyl oxalate, preferably in the presence of an inorganic or organometallic catalyst, to obtain a highly crystalline isomorphic copolyoxalate polymer which is melt extruded and drawn to form oriented filaments. The filaments are characterized by good initial tensile and knot strength and a high order of softness and flexibility. When implanted in living animal tissue, the fibers have good strength retention over a period of at least 21 days and eventually absorb with a minimal degree of adverse tissue reaction.
405 Citations
21 Claims
- 1. A synthetic absorbable suture of oriented fiber comprising an isomorphic polyoxalate polymer consisting essentially of units of cyclic and linear oxalates and having the general formula ##STR2## wherein each R is
- space="preserve" listing-type="equation">--(CH.sub.2).sub.n -- A -- (CH.sub.2).sub.n -- I
or
space="preserve" listing-type="equation">'"'"'(CH.sub.2).sub.4+2n -- IIand from about 5 to 95 mol percent of the R units are I;
A is trans 1,4-cyclohexylene or p-phenylene, n is 1 or 2 and is the same for I and II, and x is the degree of polymerization resulting in a fiber forming polymer having a molecular weight greater than about 10,000.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
- 12. The method of closing a wound in living tissue which comprises approximating the wound tissue with an absorbable suture comprising of sterile, oriented fiber comprising an isomorphic copolyoxalate polymer consisting essentially of units of cyclic and linear oxalates and having the general formula ##STR3## wherein each R is
- space="preserve" listing-type="equation">-- (CH.sub.2).sub.n -- A -- (CH.sub.2).sub.n -- I
or
space="preserve" listing-type="equation">--(CH.sub.2).sub.4+2n -- IIwith from about 5 to 95 mol percent of the R units being I;
A is trans 1,4-cyclohexylene or p-phenylene, n is 1 or 2 and is the same for I and II, and x is the degree of polymerization resulting in a fiber forming polymer having a molecular weight greater than about 10,000.- View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. A surgical prosthesis of a fabric manufactured at least in part from synthetic absorbable fibers comprising an isomorphic polyoxalate polymer consisting essentially of units of cyclic and linear oxalates and having the general formula:
- ##STR4## wherein each R is
space="preserve" listing-type="equation">-- (CH.sub.2).sub.n -- A -- (CH.sub.2).sub.n -- Ior
space="preserve" listing-type="equation">--(CH.sub.2).sub.4+2n -- IIwith from about 5 to 95 mol percent of the R units being I;
A is trans 1,4-cyclohexylene or p-phenylene, n is 1 or 2 and is the same for I and II, and x is the degree of polymerization resulting in a fiber forming polymer having a molecular weight greater than about 10,000.
- ##STR4## wherein each R is
- 21. A surgical prosthesis of a solid surgical aid cast or machined from an absorbable polymer comprising an isomorphic polyoxalate polymer consisting essentially of units of cyclic and linear oxalates and having the general formula ##STR5## wherein each R is
- space="preserve" listing-type="equation">-- (CH.sub.2).sub.n -- A -- (CH.sub.2).sub.n -- I
or
space="preserve" listing-type="equation">--(CH.sub.2).sub.4+2n -- IIwith from about 5 to 95 mol percent of the R units being I;
A is trans 1,4-cyclohexylene or p-phenylene, n is 1 or 2, and is the same for I and II, and x is the degree of polymerization resulting in a fiber forming polymer having a molecular weight greater than about 10,000.
Specification