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US3640279A
Expired / Lapsed
US
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Skin graft cutting method and machine
Assignee: First National Bank of Atlanta
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Filing: 1967-12-07
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Granted: 1972-02-08
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Expires: 1987-12-07
Abstract
Abstract Preparing a skin graft by removing a section of skin, splitting it along a plurality of equally spaced, closely associated lines, and interrupting each cut at intervals, then stretching the skin forming openings each bounded by four sides in a netlike, substantially flat graft. A machine for preparing a skin graft comprising a first roller of metal or the like having a plurality of equally spaced, cutting edges extending along the length of the roller and each being a circular, thin cutting edge having the plane thereof perpendicular to the centerline of the roller; and the second, plastic roller having grooves formed uniformly therein in spaced relation along the length thereof and the plane of the bottom of the groove being at an angle to the centerline of the roller at an angle to the cutting edge of the other roller so that when a skin graft is passed therebetween the skin is cut in a series of closely spaced, uniformly slit lines having solid portions at intervals where the cutting edge drops into the groove in the roller, thereby preparing the skin graft to be stretched in a netlike formation.
Inventors
- 👤 Warren F Brown
- 👤 Margery Joy Brown
- 👤 First National Bank Of Atl The
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:21
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/32; A61B17/322; A61B2017/3225; Y; Y10; Y10T; Y10T83/00; Y10T83/465; Y10T83/4766; Y10T83/4795; Y10T83/4824; Y10T83/4827; Y10T83/929; Y10T83/9372; Y10T83/9408
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
350 words
In a machine for cUtting and preparing a piece of skin for skin graft so that the skin will cover a larger area than the original size of the skin, comprising: a. a machine frame having an entrance therein into which the piece of skin is fed, b. a continuously operating cutting means on said machine which directly engages said skin and cuts in the direction said skin is moving at selected places in spaced relation and interrupts same so that the skin is cut with a plurality of interrupted cuts that may be expanded, said cutting means comprising two rollers rotatably mounted on said frame and in coextensive, longitudinal relation thereon, one of said rollers being a cutting roller having a plurality of individual and separate cutting edges and the other of which is a noncutting roller having a plurality of equally spaced grooves, said individual and separate cutting edges being formed in spaced relation to each other on said cutting roller and continuously circumscribing the periphery of said cutting roller and each cutting edge operating to cut a respective place in said skin in the direction movement as said skin is continuously directed between said cutting roller and said noncutting roller, said noncutting roller having a plurality of equally spaced grooves extending around the periphery thereof and each of said grooves being at an angle with the centerline of said noncutting roller and being offset at times from the corresponding cutting edge on said cutting roller, there being contact between the cutting edges of said cutting blades on said cutting roller and directly through said skin at certain locations and against the noncutting roller so that said blade edges directly contact said skin for cutting in selected locations against the roller but for noncutting when said cutting edge pressing against said skin matches with a groove whereby skin directed between said rollers is cut along a straight line uniformly at spaced locations in the same direction of travel of said skin and said cuts interrupted periodically and uniformly when the cutting edge drops into a corresponding grooved roller.
Claim 2
Dependent Claim
350 words
In a machine for cUtting and preparing a piece of skin for skin graft so that the skin will cover a larger area than the original size of the skin, comprising: a. a machine frame having an entrance therein into which the piece of skin is fed, b. a continuously operating cutting means on said machine which directly engages said skin and cuts in the direction said skin is moving at selected places in spaced relation and interrupts same so that the skin is cut with a plurality of interrupted cuts that may be expanded, said cutting means comprising two rollers rotatably mounted on said frame and in coextensive, longitudinal relation thereon, one of said rollers being a cutting roller having a plurality of individual and separate cutting edges and the other of which is a noncutting roller having a plurality of equally spaced grooves, said individual and separate cutting edges being formed in spaced relation to each other on said cutting roller and continuously circumscribing the periphery of said cutting roller and each cutting edge operating to cut a respective place in said skin in the direction movement as said skin is continuously directed between said cutting roller and said noncutting roller, said noncutting roller having a plurality of equally spaced grooves extending around the periphery thereof and each of said grooves being at an angle with the centerline of said noncutting roller and being offset at times from the corresponding cutting edge on said cutting roller, there being contact between the cutting edges of said cutting blades on said cutting roller and directly through said skin at certain locations and against the noncutting roller so that said blade edges directly contact said skin for cutting in selected locations against the roller but for noncutting when said cutting edge pressing against said skin matches with a groove whereby skin directed between said rollers is cut along a straight line uniformly at spaced locations in the same direction of travel of said skin and said cuts interrupted periodically and uniformly when the cutting edge drops into a corresponding grooved roller.
Claim 3
Dependent Claim
25 words
The device claimed in claim 1, wherein: there is a means on said frame to prevent said skin from reentering said rollers after passing therebetween.
Claim 4
Dependent Claim
54 words
The device in claim 1, wherein: said cutting means comprises an array of spaced cutting edges fixed with respect to each other and movable together against the skin and there being a discontinuous cutting surface against which said blades operate on the skin so that the cuts are interrupted and said skin is expansile.
Claim 5
Dependent Claim
25 words
The device in claim 1 wherein the plane of each of said cutting edges is substantially perpendicular to the longitudinal centerline of said cutting roller.
Claim 6
Dependent Claim
25 words
The device claimed in claim 4, wherein: there is a means on said frame to prevent said skin from reentering said rollers after passing therebetween.
Claim 7
Dependent Claim
18 words
The device in claim 4, wherein: the spaces between cutting edges from edge to edge is approximately 0.050.
Claim 8
Dependent Claim
37 words
The device in claim 6, wherein each of said blades has a blade edge comprising converging blade faces and the angle of said blade faces is approximately less that 65*, in the manner shown in FIG. 6.
Claim 9
Dependent Claim
22 words
The device in claim 4 wherein the angular relationship between the cutting edges and the grooves is that shown in FIG. 6.
Claim 10
Dependent Claim
27 words
The device in claim 4 wherein the grooves are circumferential on said noncutting roller and at an angle of less than 90* to the center longitudinal axis.
Claim 11
Dependent Claim
59 words
The method of preparing a piece of skin for a skin graft to make said skin expansible to cover a larger area than the actual size of the piece of skin itself by means of directing said piece of skin through the machine defined in claim 5 and thereby cutting said skin as set forth in said claim 5.
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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) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |