Sustained nitric oxide release coating using diazeniumdiolate-doped polymer matrix with ester capped poly(lactic-co-glycolic acid) additive
A polymeric composition includes a polymer matrix having a lipophilic discrete nitric oxide adduct and/or a polymeric nitric oxide adduct associated therewith, by covalent attachment to the polymer matrix and/or by dispersion within the polymer matrix, with the discrete nitric oxide adduct and/or the polymeric nitric oxide adduct being capable of releasing nitric oxide (NO). The polymeric composition further includes an ester capped poly(lactide-co-glycolide) (PLGA) additive to at least one of increase, prolong, and control NO release rates from the lipophilic discrete nitric oxide adduct and/or the polymeric nitric oxide adduct.
1. A polymeric composition, comprising:
a polymer matrix having at least one of a lipophilic discrete nitric oxide adduct or a polymeric nitric oxide adduct associated therewith, by: covalent attachment to the polymeric matrix; dispersion within the polymeric matrix; or both, with the at least one of the discrete nitric oxide adduct or the polymeric nitric oxide adduct capable of releasing nitrous oxide (NO); and
an ester capped poly(lactide-co-glycolide) (PLGA) additive to at least one of increase, prolong, and control NO release rates from the at least one of the lipophilic discrete nitric oxide adduct or the polymeric nitric oxide adduct, the ester capped PLGA additive having a 65:35 ratio of lactic acid monomer to glycolic acid monomer.
2. The polymeric composition as defined in claim 1 wherein the polymer matrix comprises a hydrophobic polymer or a polymer with both hydrophobic and hydrophilic domains.
3. The polymeric composition as defined in claim 1 wherein the polymer matrix comprises at least one of poly(vinyl chloride), silicone rubbers, polyurethanes, polymethacrylates, polyacrylates, polycaprolactone, copolymers thereof, and mixtures thereof.
4. The polymeric composition as defined in claim 1 wherein the polymer matrix further comprises a plasticizer.
5. The polymeric composition as defined in claim 4 wherein the plasticizer comprises at least one of dioctyl sebacate, isopropyl palmitate, isopropyl isosterate, diisooctyl phthalate, o-nitrophenyloctyl ether, and mixtures thereof.
6. The polymeric composition as defined in claim 1 wherein the polymer matrix further comprises chromoionophores.
7. The polymeric composition as defined in claim 1 wherein the polymer matrix comprises poly(vinyl chloride).
8. The polymeric composition as defined in claim 1 wherein the polymer matrix comprises a polyurethane elastomer with poly(dimethylsiloxane) (PDMS) soft segments.
9. The polymeric composition as defined in claim 1 wherein:
the polymer matrix is poly(vinyl chloride) (PVC) or a polyurethane elastomer with poly(dimethylsiloxane) (PDMS) soft segments; and
the composition includes the lipophilic discrete nitric oxide (NO) adduct, the NO adduct being DBHD/N 2 O 2 (diazeniumdiolated dibutylhexane diamine).
10. The polymeric composition as defined in claim 9 wherein:
the polymer matrix includes 65 wt % of: the PVC and dioctyl sebacate (DOS) in a 2:1 ratio; or the polyurethane elastomer with poly(dimethylsiloxane) (PDMS) soft segments;
the composition includes 25 wt % DBHD/N 2 O 2 ; and
the composition includes 10 wt % of the 6535DLG7E PLGA.
11. A polymeric device, comprising:
a base polymer layer;
a top polymer layer disposed on the base polymer layer; and
at least one active layer between the base polymer layer and the top polymer layer, and the at least one active intermediate layer including the polymeric composition as defined in claim 1 .
12. A polymeric device, comprising:
a base polymer layer;
a top polymer layer disposed on the base polymer layer; and
at least one active layer between the base polymer layer and the top polymer layer, and the at least one active intermediate layer including the polymeric composition as defined in claim 9 .
13. The polymeric device as defined in claim 12 wherein:
the base polymer layer is PVC or the polyurethane elastomer with poly(dimethylsiloxane) (PDMS) soft segments; and
the top polymer layer is: PVC and dioctyl sebacate (DOS) in a 1:2 ratio; or the polyurethane elastomer with poly(dimethylsiloxane) (PDMS) soft segments.
14. The polymeric device as defined in claim 13 wherein the polymeric device is extracorporeal circuit (ECC) tubing or an intravascular catheter.
15. A method for making an NO-releasing polymeric composition, comprising the steps of:
providing a polymer matrix;
dispersing at least one of a lipophilic discrete nitric oxide adduct and a polymeric nitric oxide adduct within the polymeric matrix, the at least one of the discrete nitric oxide adduct or the polymeric nitric oxide adduct capable of releasing nitrous oxide (NO); and
selecting an ester capped poly(lactide-co-glycolide) (PLGA) additive to at least one of increase, prolong, and control NO release rates from the at least one of the lipophilic discrete nitric oxide adduct or the polymeric nitric oxide adduct, the ester capped PLGA additive having a 65:35 ratio of lactic acid monomer to glycolic acid monomer and having a hydrolysis rate that substantially matches the rate of production of amine sites formed after loss of NO from the at least one of the discrete nitric oxide adduct or the polymeric nitric oxide adduct.