US5109875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ring tissue expanders and their method of use
Assignee: City of Hope
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Filing: 1990-05-02
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Granted: 1992-05-05
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Expires: 2010-05-02
Abstract
Abstract An apparatus and method for treating skin lesions using an expansion chamber surgically implanted under the skin and progressively filled with fluid for growing new skin along the entire circumference surrounding the skin lesion so that upon removal of the expansion chamber the new skin radially contracts over the lesion.
Inventors
- 👤 Marc E. Gottlieb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:45
CPC Classifications
A; A61; A61B; A61B90/00; A61B90/02
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
95 words
A procedure for reducing the size of a first epidermal scar which comprises: (i) surrounding said first scar with the expansion chamber of a surgically implanted device to induce the growth of new skin overlaying the surface of said expansion chamber and extending around the perimeter of said scar; (ii) removing the implanted device and permitting the new skin to contract inwardly, thus producing a smaller, second epidermal scar; and (iii) reducing said smaller scar by at least one repetition of steps (i) and (ii) with a smaller surgically implanted device having an expansion chamber.
Claim 2
Dependent Claim
95 words
A procedure for reducing the size of a first epidermal scar which comprises: (i) surrounding said first scar with the expansion chamber of a surgically implanted device to induce the growth of new skin overlaying the surface of said expansion chamber and extending around the perimeter of said scar; (ii) removing the implanted device and permitting the new skin to contract inwardly, thus producing a smaller, second epidermal scar; and (iii) reducing said smaller scar by at least one repetition of steps (i) and (ii) with a smaller surgically implanted device having an expansion chamber.
Claim 3
Dependent Claim
90 words
The procedure defined by claim 1 in which each surgically implanted device is generally ring shaped, is implanted below the surface of the skin adjacent the perimeter of the scar to be reduced and comprises: a flat base member having an open central region to accommodate a scar to be reduced, said base member having attached thereto a flexible upper member surrounding said central region and defining an expansion chamber of arch-like cross-section when expanded, and means for progressively expanding said chamber by the introduction of fluid in controlled volume.
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) | 1995-05-05 | 1995-11-04 | 1996-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-05-05 | 1999-11-04 | 2000-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-05-05 | 2003-11-04 | 2004-05-05 | $7700.00 | Window Closed / Lapsed |