Hydrophilic, swellable coatings for biosensors
First Claim
1. A method for forming an implantable biosensor having a biocompatible coating, the method comprising coating the implantable biosensor with a hydrogel composition formed by admixing (a) a diisocyante, the diisocyanate comprising about 50 mol % of the reactants in the admixture;
- (b) a hydrophilic polymer selected from, the group consisting of a hydrophilic polymer diol, a hydrophilic polymer diamine and combinations thereof; and
, optionally, (c) a chain extender, thereby forming the implantable biosensor having the hydrogel coating, wherein the hydrogel composition has a water pickup of at least about 120% by weight.
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Abstract
Methods for reducing the electrode impedance of implantable biosensors by coating the surface of the biosensor with a uniform hydrogel which allows unimpeded water movement around the sensor are provided. The surface coatings are compositions which are biocompatible and are capable of water uptake of at least 120% of their weight, more preferably at least 200% of their weight. Upon the uptake of water, the hydrogels used in the present invention will also swell and provide a layer of water around the electrodes to which the hydrogels are attached. The hydrogels can be prepared from (a) a diisocyanate, (b) a hydrophilic polymer which is a hydrophilic diol, a hydrophilic diamine, or a combination thereof, and optionally, (c) a chain extender.
462 Citations
19 Claims
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1. A method for forming an implantable biosensor having a biocompatible coating, the method comprising coating the implantable biosensor with a hydrogel composition formed by admixing (a) a diisocyante, the diisocyanate comprising about 50 mol % of the reactants in the admixture;
- (b) a hydrophilic polymer selected from, the group consisting of a hydrophilic polymer diol, a hydrophilic polymer diamine and combinations thereof; and
, optionally, (c) a chain extender, thereby forming the implantable biosensor having the hydrogel coating, wherein the hydrogel composition has a water pickup of at least about 120% by weight. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- (b) a hydrophilic polymer selected from, the group consisting of a hydrophilic polymer diol, a hydrophilic polymer diamine and combinations thereof; and
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13. A method for forming an implantable biosensor having a biocompatible coating, the method comprising coating the implantable biosensor with biocompatible composition formed by admiring (a) a diisocyanate, the diisocyanate comprising about 50 mol % of the reactants in the mixture;
- (b) a hydrophilic polymer which is a member selected from the group consisting of a hydrophilic polymer diol, a hydrophilic polymer diamine and combinations thereof;
(c) a siloxane polymer having a glucose groups at the chain termini, the biocompatible composition having a glucose diffusion coefficient of from about 1×
10−
9 cm2/sec to about 200×
10−
9 cm2/sec, a water pickup of at least 25% and a ratio of Doxygen/glucose of from about 5 to about 200. - View Dependent Claims (14, 15, 16, 17, 18, 19)
- (b) a hydrophilic polymer which is a member selected from the group consisting of a hydrophilic polymer diol, a hydrophilic polymer diamine and combinations thereof;
Specification