Patent US3971388A successfully refreshed from Google Patents.
US3971388A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Titanium covered cardiac pacemaker with elastomer coating and method of applying same
Assignee: Telectronics Pacing Systems Inc
•
Filing: 1974-11-29
•
Granted: 1976-07-27
•
Expires: 1994-11-29
Abstract
Abstract An implantable cardiac pacemaker which is enclosed in a titanium or titanium alloy housing with at least a portion of the housing coated with a silicone elastomer which both electrically and physiologically isolates the metal surface from the body while at the same time permitting the body tissue to act on the elastomer itself to provide a form of adhesion thereby to assist in stabilizing the pacemaker position within the body.
Inventors
- 👤 David J. Cowdery
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:21
CPC Classifications
A; A61; A61L; A61L27/00; A61L27/28; A61L27/34; A61N; A61N1/00; A61N1/18; A61N1/32; A61N1/36; A61N1/372; A61N1/375; A61N1/37512
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
70 words
A method of applying a flexible silicone elastomer to an implantable heart pacemaker enclosed within a housing formed of a material from the group including titanium and titanium alloys comprising dispersing a silicone elastomer in a solvent from the group including benezene, methyl benezene and dimethyl benezene, dipping the heart pacemaker in the dispersed elastomer, evaporating the solvent from the elastomer and curing the elastomer coating in a humid environment.
Claim 2
Independent Claim
70 words
A method of applying a flexible silicone elastomer to an implantable heart pacemaker enclosed within a housing formed of a material from the group including titanium and titanium alloys comprising dispersing a silicone elastomer in a solvent from the group including benezene, methyl benezene and dimethyl benezene, dipping the heart pacemaker in the dispersed elastomer, evaporating the solvent from the elastomer and curing the elastomer coating in a humid environment.
Claim 3
Dependent Claim
26 words
The method of claim 1 wherein the steps of dispersing, dipping and evaporating are all accomplished in an inert dry atmosphere whereby elastomer reaction is prevented.
Claim 4
Dependent Claim
22 words
The method of claim 2 wherein said atmosphere is argon at 35° C. and having a dew point of approximately -60° C.
Claim 5
Dependent Claim
22 words
The method of claim 2 wherein said atmosphere is nitrogen at 35° C. and having a dew point of approximately -60° C.
Claim 6
Dependent Claim
33 words
The method of claim 2 wherein said step of evaporating comprises blowing a continuous flow of inert gas at about one foot per second, past the pacemaker until the dispersant solvent has evaporated.
Claim 7
Dependent Claim
25 words
The method of claim 5 wherein said inert gas is at about 35° C. and the flow of gas is continued for about 21/2 hours.
Claim 8
Dependent Claim
29 words
The method of claim 1, together with the step of creating a hydrated oxide surface layer on said housing prior to dipping the pacemaker whereby optimum adhesion is produced.
Claim 9
Dependent Claim
37 words
The method as set forth in claim 7 wherein the hydrated oxide surface layer is created by soaking the housing in a 0.01 molar solution of sodium hydroxide and rinsing the hydroxide soaked pacemaker in distilled water.
References Cited (Backward Citations)
US3101277A
Cited
US2999852A
Cited
US3195540A
Cited
US3169079A
Cited
US3455732A
Cited
US3649367A
Cited
US3754967A
Cited
US3866616A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-07-27 | 1980-01-26 | 1980-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-27 | 1984-01-26 | 1984-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-27 | 1988-01-26 | 1988-07-27 | $7700.00 | Window Closed / Lapsed |