US3875937A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surgical dressings of absorbable polymers
Assignee: Wyeth Holdings LLC
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Filing: 1973-05-31
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Granted: 1975-04-08
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Expires: 1993-05-31
Abstract
Abstract Polyhydroxyacetic ester, also called polyglycolic acid (PGA), has surgically useful mechanical properties. On implantation, in living mammalian tissue, the polyglycolic acid is absorbed, and replaced by living tissue. Polyglycolic acid fashioned into a sterile gauze, felt or velour dressing protects a wound surface, such as a burn, traumatic injury, or surgical incision, and may be left at least partially embedded, as in a scab, with the part below the healed tissue surface being absorbed, and that above the tissue surface dropping off with the scab, or be completely embedded therein.
Inventors
- 👤 Edward Emil Schmitt
- 👤 Rocco Albert Polistina
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:50
CPC Classifications
A; A61; A61K; A61K9/00; A61K9/0012; A61K9/0019; A61K9/0024; A61F; A61F13/00; A61F13/00051; A61F13/00063; A61K9/70; A61L; A61L15/00; A61L15/16; A61L15/22; A61L15/26; A61L31/00; A61L31/04; A61L31/06; D; D01; D01F; D01F6/00; D01F6/58; D01F6/62; D01F6/625; A61B; A61B17/00; A61B2017/00004; A61F13/15; A61F13/551; A61F13/84; A61F13/8405; A61F2013/00089; A61F2013/00157; A61F2013/00217; A61F2013/00221; A61F2013/00361; A61F2013/00365; A61F2013/00519; A61F2013/00902; A61F2013/15008; A61F2013/15048; Y; Y10; Y10S; Y10S128/00; Y10S128/08
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
37 words
A SURGICAL DRESSING COMPRISING A STERILE TISSUE CONTACTING FABRIC SUSCEPTIBLE TO HYDROLYTIC DEGADATION TO TISSUE ABSORBABLE COMPONENTS CONSISTING ESSENTIALLY OF STERILE FILAMENTS OF POLYGLYCOLIC ACID, AND AT LEAST THE TISSUE CONTACTING PORTION BEING FREE FROM NON-ABSORBABLE COMPONENTS.
Claim 2
Dependent Claim
37 words
A SURGICAL DRESSING COMPRISING A STERILE TISSUE CONTACTING FABRIC SUSCEPTIBLE TO HYDROLYTIC DEGADATION TO TISSUE ABSORBABLE COMPONENTS CONSISTING ESSENTIALLY OF STERILE FILAMENTS OF POLYGLYCOLIC ACID, AND AT LEAST THE TISSUE CONTACTING PORTION BEING FREE FROM NON-ABSORBABLE COMPONENTS.
Claim 3
Dependent Claim
23 words
The dressing of claim 1 which has physically imposed upon said filaments a small but physiologically effective quantity of a biologically active medicament.
Claim 4
Dependent Claim
28 words
The dressing of claim 2 in which the medicament is selected from the group consisting of furacin, chlorotetracycline, tetracycline, oxytetracycline, sulfadiazine, their therapeutically effective salts, and silver nitrate.
Claim 5
Dependent Claim
14 words
The dressing of claim 1 in which the tissue contacting fabric is sterile gauze.
Claim 6
Dependent Claim
16 words
The dressing of claim 1 in which the tissue contacting fabric is a sterile felted sponge.
Claim 7
Dependent Claim
113 words
A two component surface dressing for the exposed surface of living tissue comprising an absorbable layer of a fabric susceptible to hydrolytic degradation to tissue absorbable components consisting essentially of sterile filaments of polyglycolic acid adapted to be placed adjacent to living tissue and at least in part to absorb body fluids from such tissue, and to be invaded by and replaced by living tissue, and be absorbed by living tissue, and a sterile external non-tissue-absorbable layer, in implacing and retaining relationship with said absorbable polyglycolic layer, whereby said external layer protects the polyglycolic acid layer from mechanical damage, and maintains said polyglycolic acid layer in a desired location during a healing process.
Claim 8
Dependent Claim
113 words
A two component surface dressing for the exposed surface of living tissue comprising an absorbable layer of a fabric susceptible to hydrolytic degradation to tissue absorbable components consisting essentially of sterile filaments of polyglycolic acid adapted to be placed adjacent to living tissue and at least in part to absorb body fluids from such tissue, and to be invaded by and replaced by living tissue, and be absorbed by living tissue, and a sterile external non-tissue-absorbable layer, in implacing and retaining relationship with said absorbable polyglycolic layer, whereby said external layer protects the polyglycolic acid layer from mechanical damage, and maintains said polyglycolic acid layer in a desired location during a healing process.
Claim 9
Dependent Claim
22 words
The two component dressing of claim 6 in which the external layer is at least in part a strip of adhesive tape.
Claim 10
Dependent Claim
26 words
The two component dressing of claim 6 in which the external layer is at least in part a nonabsorbable fabric next to said absorbable fabric layer.
Claim 11
Dependent Claim
92 words
A surgical implant comprising a sterile non-absorbable implant whose physical configuration gives a desired constraint to living tissue, and which implant is of a material which is comparatively inert towards living tissue, and a sterile bicomponent retaining member fixedly attached to said implant and which is in implant retaining relationship, with a polyglycolic acid component of the retaining member in a position to be absorbed by and replaced by living tissue which tissue is then intermeshed with the non-absorbable component of the retaining member, to hold the implant in a desired location.
Claim 12
Dependent Claim
92 words
A surgical implant comprising a sterile non-absorbable implant whose physical configuration gives a desired constraint to living tissue, and which implant is of a material which is comparatively inert towards living tissue, and a sterile bicomponent retaining member fixedly attached to said implant and which is in implant retaining relationship, with a polyglycolic acid component of the retaining member in a position to be absorbed by and replaced by living tissue which tissue is then intermeshed with the non-absorbable component of the retaining member, to hold the implant in a desired location.
Claim 13
Independent Claim
71 words
A METHOD OF PROTECTING THE SURFACE OF LIVING TISSUE DURING A HEALING PROCESS WHICH COMPRISES COVERING A WOUND SURFACE WITH A STERILE DRESSING OF FILAMENTS OF POLYGLYCOLIC ACID WITH PART OF THE DESSING BEING RETAINED IN THE HEALING TISSUE AND ABSORBED BY THE LIVING TISUE, AND PART OF THE DRESSING EXTENDING ABOVE THE REGENERATING TISSUE, AND AFTER HEALING IS SUBSTANTIALLY COMPLETE, REMOVING THE NON-ABSORBED PART WHICH EXTENDS ABOVE THE TISSUE SURFACE.
Claim 14
Independent Claim
71 words
A METHOD OF PROTECTING THE SURFACE OF LIVING TISSUE DURING A HEALING PROCESS WHICH COMPRISES COVERING A WOUND SURFACE WITH A STERILE DRESSING OF FILAMENTS OF POLYGLYCOLIC ACID WITH PART OF THE DESSING BEING RETAINED IN THE HEALING TISSUE AND ABSORBED BY THE LIVING TISUE, AND PART OF THE DRESSING EXTENDING ABOVE THE REGENERATING TISSUE, AND AFTER HEALING IS SUBSTANTIALLY COMPLETE, REMOVING THE NON-ABSORBED PART WHICH EXTENDS ABOVE THE TISSUE SURFACE.
Claim 15
Dependent Claim
53 words
The method of claim 10 in which the polyglycolic filaments are pressed into intimate surface contact with a burned area, with exclusion of air, and the tissue regeneration into the polyglycolic acid dressing is observed to insure proper healing by raising only part of the dressing with minimal disturbance of the regenerating tissue.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |