Patent US3818894A successfully refreshed from Google Patents.
US3818894A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laryngeal implant
Assignee: Czech Academy of Sciences
•
Filing: 1972-01-03
•
Granted: 1974-06-25
•
Expires: 1992-01-03
Abstract
Abstract This invention relates to an implant for surgical purposes and which is especially useful for the operative treatment of afflicted vocal cords, as well as to the method for its production. The implant is made from water-swellable and physiologically inert material, such as a synthetic cross-linked hydrophilic gel, and has in a dry state, when it is ready for use in an operation, the shape of a straight or bent stick provided with a sharp, pointed tip. The implant body except the tip may contain physiologically inert plasticizers.
Inventors
- 👤 O Wichterle
- 👤 Z Kresa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:43
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/20; A61L; A61L27/00; A61L27/14; A61L27/16
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
61 words
A larynreal implant for surgical purposes, for use in the surgical treatment of vocal cords comprising a body of hydrophilic polymeric crosslinked gel material having the form of a rod-like needle with a sharp, pointed tip in the dry state in which it is applied, said implant being swellable after implantation in the vocal cord to help improve closure of glottis.
Claim 2
Dependent Claim
61 words
A larynreal implant for surgical purposes, for use in the surgical treatment of vocal cords comprising a body of hydrophilic polymeric crosslinked gel material having the form of a rod-like needle with a sharp, pointed tip in the dry state in which it is applied, said implant being swellable after implantation in the vocal cord to help improve closure of glottis.
Claim 3
Dependent Claim
31 words
An implant in accordance with claim 1 wherein the hydrophilic polymeric crosslinked material is an insoluble, hydrophilic gel having a linear swelling capacity in the region from 10 to 45 percent.
Claim 4
Dependent Claim
12 words
The implant according to claim 1 wherein said tip is glassy hard.
Claim 5
Dependent Claim
60 words
The implant according to claim 1 wherein the hydrophilic material is a copolymer selected from the group of glycol methecrylate and acrylate containing up to 2 weight percent of a material selected from the group consisting of glycol dimethacrylate and diacrylate and up to 3 weight percent of material selected from the group consisting of methacrylic acid or acrylic acid.
Claim 6
Dependent Claim
36 words
The implant according to claim 1 wherein a physiologically inert plasticizer is added to said material along the length of the body except at its tip to provide said rod with a lower modulus of elasticity.
Claim 7
Dependent Claim
23 words
The implant according to claim 1 wherein said material contains an additive selected from the group consisting of dyes, pigments and contrast substances.
Claim 8
Dependent Claim
22 words
The implant according to claim 1 which has approximately the same length in a dry state as after equilibrium swelling in water.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |