US5178201A
Expired / Lapsed
US
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Method for producing an implant with an open-celled metal structure
Assignee: Eska Medical GmbH
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Filing: 1992-03-03
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Granted: 1993-01-12
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Expires: 2012-03-03
Abstract
Abstract An implant is produced with an open-celled structure at least partly covering its surface. The method uses a positive pattern having a basic pattern with particles bonded to it, the particles covering the areas of the pattern which correspond to the structured surface areas of the implant. The method uses the usual steps of conventional lost positive casting techniques. Importantly, the particles have a base with four to eight pins extending radially from its surface with at least three being connected to the basic pattern (e.g., by adhesive).
Inventors
- 👤 Olaf Ahlers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:33
CPC Classifications
B; B22; B22C; B22C9/00; B22C9/02; B22C9/04; A; A61; A61C; A61C13/00; A61C13/0003; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/30767; A61F2/32; A61F2/36; A61F2/3662; A61F2/367; A61L; A61L27/00; A61L27/02; A61L27/04; A61L27/50; A61L27/56; A61F2/3094; A61F2002/30001; A61F2002/30108; A61F2002/30199; A61F2002/30303; A61F2002/30316; A61F2002/30329; A61F2002/30448; A61F2/30907; A61F2002/30909; A61F2002/3092; A61F2002/30929; A61F2/30942; A61F2002/30957; A61F2/3609; A61F2002/3625; A61F2002/3631; A61F2220/00; A61F2220/0025; A61F2220/005; A61F2230/00; A61F2230/0063; A61F2310/00; A61F2310/00005; A61F2310/00011; A61F2310/00389; A61F2310/00952; A61L2400/00; A61L2400/18
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
146 words
In a method for producing an implant with an open-celled structure at least partially covering its surface by usage of a positive pattern, comprising the steps of forming an incinerable or meltable basic pattern with incinerable or meltable particles bonded to said pattern in the areas which correspond to structured surface areas of the resulting implant, embedding the positive pattern as a whole in a ceramic embedding mass, heating the pattern, whereby the basic pattern is incinerated or melted, the particles are incinerated or melted, and the ceramic embedding mass is baked, molten material is poured into the remaining cavity, and after hardening of the molten material the ceramic embedding mass is removed, the improvement comprising that the particles (5) have a basic body (6) from which four to eight pins (7) extend radially, of which at least three pins are adhered to the basic pattern.
Claim 2
Dependent Claim
146 words
In a method for producing an implant with an open-celled structure at least partially covering its surface by usage of a positive pattern, comprising the steps of forming an incinerable or meltable basic pattern with incinerable or meltable particles bonded to said pattern in the areas which correspond to structured surface areas of the resulting implant, embedding the positive pattern as a whole in a ceramic embedding mass, heating the pattern, whereby the basic pattern is incinerated or melted, the particles are incinerated or melted, and the ceramic embedding mass is baked, molten material is poured into the remaining cavity, and after hardening of the molten material the ceramic embedding mass is removed, the improvement comprising that the particles (5) have a basic body (6) from which four to eight pins (7) extend radially, of which at least three pins are adhered to the basic pattern.
Claim 3
Dependent Claim
27 words
A method according to claim 1 wherein the particles (5) are symmetrically shaped and have six equidistantly spaced pins (7) radially extending from the basic pattern (6).
Claim 4
Dependent Claim
36 words
A method according to claim 1 wherein the basic body (6) of particles (5) has a diameter of 1.5 to 3 mm and the length of the radially extending pins (7) is 0.8 to 1.6 mm.
Claim 5
Dependent Claim
19 words
A method according to claim 1 wherein several layers (2,3) of particles (5) are bonded to the basic pattern.
Claim 6
Dependent Claim
20 words
A method according to claim 4 wherein up to four layers of particles are bonded on top of each other.
Claim 7
Dependent Claim
11 words
A method aocording claim 1 wherein the particles (5) comprise wax.
Claim 8
Dependent Claim
12 words
A method according to claim 1 wherein the particles (5) comprise polypropylene.
Claim 9
Dependent Claim
12 words
A method according to claim 1 wherein the particles (5) comprise polyethylene.
Claim 10
Dependent Claim
14 words
A method according to claim 1 wherein the particles (5) comprise poly (methyl methacrylate).
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) | 1996-01-12 | 1996-07-13 | 1997-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-01-12 | 2000-07-13 | 2001-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-01-12 | 2004-07-13 | 2005-01-12 | $7700.00 | Window Closed / Lapsed |