Patent US4835410A successfully refreshed from Google Patents.
US4093361A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite prosthetic polymeric devices
Assignee: Pilkington Visioncare Inc
•
Filing: 1974-04-29
•
Granted: 1978-06-06
•
Expires: 1994-04-29
Abstract
Abstract A new concept in polymeric prosthetic devices having a portion thereof composed of a hydrophilic polymer is described herein in which distortions and stresses upon the device due to water absorption are minimized or eliminated. Physical properties of the various portions of the device may thus be varied to provide the particular physical parameters required. Compositions of matter and methods of manufacturing the novel prosthetic devices are described. The composition of matter is a polymer which includes a water soluble solid inert substance removable by exposure to water during hydration of the hydrophilic portion of the device, thus eliminating distortions and stresses therein. The hydrophilic polymer described is useful, for example, as one component part of such prosthetic devices as a hard-soft contact lens, cardiovascular implants, etc. useful in aqueous environment wherein stress and deformation of the polymer shape due to hydration must be minimized.
Inventors
- 👤 Charles E. Erickson
- 👤 Amar N. Neogi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:10
CPC Classifications
B; B29; B29D; B29D11/00; B29D11/00009; B29D11/00038; B29D11/00048; G; G02; G02B; G02B1/00; G02B1/04; G02B1/041; G02B1/043; G02C; G02C7/00; G02C7/02; G02C7/04; G02C7/049
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
88 words
A contact lens comprising a center lens portion and a peripheral skirt portion attached thereto, said center lens portion having a greater hardness than said peripheral skirt portion, said peripheral skirt portion comprising a hydrophilic, normally water swellable, polymer matrix compatible with the material forming said center lens portion, said peripheral skirt portion being relatively free of stress and distortion and containing a water soluble solid inert substance dissolved throughout the polymer matrix before hydration; said substance being removed from said matrix during hydration of said hydrophilic polymer.
Claim 2
Dependent Claim
88 words
A contact lens comprising a center lens portion and a peripheral skirt portion attached thereto, said center lens portion having a greater hardness than said peripheral skirt portion, said peripheral skirt portion comprising a hydrophilic, normally water swellable, polymer matrix compatible with the material forming said center lens portion, said peripheral skirt portion being relatively free of stress and distortion and containing a water soluble solid inert substance dissolved throughout the polymer matrix before hydration; said substance being removed from said matrix during hydration of said hydrophilic polymer.
Claim 3
Dependent Claim
15 words
The contact lens of claim 1 wherein said center lens portion comprises a hydrophilic polymer.
Claim 4
Dependent Claim
53 words
The contact lens of claim 1 wherein said center lens portion comprises a cross-linked copolymer of from 30 to 90% by weight of a water insoluble hydrophilic monomer, and 10 to 70% by weight of a water soluble vinyl monomer and a minor amount up to 20% by weight of a cross-linking agent.
Claim 5
Dependent Claim
12 words
The contact lens of claim 1 wherein said substance is polyoxyethylene glycol.
Claim 6
Dependent Claim
68 words
The contact lens of claim 1 wherein said peripheral skirt portion comprises a copolymer of from 10 to 95% by weight of an hydroxyalkyl acrylate or methacrylate, from 5 to 90% by weight of a hydrophilic water insoluble monomer, and up to 10% by weight of a cross-linking agent with a minor amount up to 40% by weight of a water soluble inert substance dispersed throughout said copolymer.
Claim 7
Dependent Claim
112 words
The contact lens of claim 1 wherein said center lens portion is a cross-linked copolymer consisting essentially of from 10 to 70% by weight hydroxyethyl methacrylate, from 30 to 90% by weight of methoxyethyl methacrylate, and a minor amount up to about 20% by weight of a cross-linking monomer and wherein said peripheral skirt portion is a cross-linked copolymer of from 10 to 95% by weight hydroxyethyl methacrylate, from 5 to 90% by weight of methoxyethyl methacrylate, a minor amount up to 10% by weight of a cross-linking monomer and having a minor amount up to 40% by weight of a water soluble solid inert substance dispersed throughout said copolymer before hydration.
Claim 8
Dependent Claim
34 words
The contact lens of claim 1 wherein said water soluble inert substance is present in said polymer matrix before hydration in approximate volumetric equivalence to the water absorbed in said polymer matrix after hydration.
Claim 9
Dependent Claim
71 words
The contact lens of claim 1 wherein said inert substance is chosen from the group consisting of: (1) Polyoxyethylene glycol, polyoxypropylene glycol, polyoxybutylene glycol, M.W. 1000 to 100,000, (2) Benzoic, Toluic, Napthoic acids, (3) Esters and ethers of polyoxyethylene glycols, polyoxypropylene glycol and polyoxybutylene glycol, M.W. 1000 to 100,000, (4) Soaps and surfactants, (5) Polyvinyl pyrrolidone, polyvinyl caprolactam, polyvinyl piperidone, (6) N-acetyl polyethylene imine, (7) Poly-N-vinyl imidozole, poly-N-vinyl succinimide, poly-N-vinyl glutaramide.
References Cited (Backward Citations)
US2241415A
Cited
US2976576A
Cited
US3220960A
Cited
US3699089A
Cited
US3499862A
Cited
US3628988A
Cited
US3639524A
Cited
US3619044A
Cited
US3758448A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-06-05 | 1981-12-05 | 1982-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-05 | 1985-12-05 | 1986-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-05 | 1989-12-05 | 1990-06-06 | $7700.00 | Window Closed / Lapsed |