EP0371908B1
Expired / Lapsed
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Implant
Assignee: Biotronik SE and Co KG
•
Filing: 1989-10-26
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Granted: 1994-01-26
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Expires: 2009-10-26
Abstract
Abstract Implant for a preferably cardiovascular application having a surface coating (2) of semiconductor material. <IMAGE>
Inventors
- 👤 Armin Dipl.-Phys. Bolz
- 👤 Max Prof. Dr.-Ing. Schaldach
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 08:31
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/0077; A61L; A61L27/00; A61L27/28; A61L27/30; A61L27/306; A61L27/50; A61F2/02; A61F2/24; A61F2310/00; A61F2310/00389; A61F2310/00592; A61F2310/00598; A61F2310/0073; A61F2310/00742; A61F2310/00856; A61F2310/00874
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
65 words
Implant, in particular for cardiovascular application, with a coating (2) which consists of one of the semiconducting materials silicon carbide (a-SiC:H), silicon nitride (a-SiN:H) or silicon oxide (a-SiO:H), characterised in that for the stabilization of the silicate network a slight doping of the coating (2) with phosphorus is provided, in particular in the form of phosphine with a concentration of less than one per cent.
Claim 2
Dependent Claim
13 words
Implant according to claim 1, characterised in that the semiconducting material is amorphous.
Claim 3
Dependent Claim
13 words
Implant according to claim 1, characterised in that the semiconducting material is microcrystalline.
Claim 4
Dependent Claim
28 words
Implant according to any one of the preceding claims, characterised in that the coating (2) has a thickness in the range of 1 µm, at most 10 µm.
Claim 5
Dependent Claim
18 words
Implant according to claim 4, characterised in that the surface roughness lies in the range of 0.1 µm.
Claim 6
Dependent Claim
41 words
Implant according to any one of the preceding claims, characterised in that the state density of the coating (2) comes to 10¹⁸ cm⁻³ev⁻¹ or less, so that direct charge exchange processes between coagulation-specific proteins and the implant surface (3) are prevented.
Claim 7
Dependent Claim
29 words
Implant according to claim 2, c haracterised in that the amorphous silicon carbide (a-SiC:H) is in particular a precipitation product of a mixture containing silane (SiH4) and/or methane (CH4).
Claim 8
Dependent Claim
18 words
Implant according to any one of the preceding claims, characterised in that the coating (2) is substantially non-porous.
Claim 9
Dependent Claim
81 words
Implant according to any one of the preceding claims, characterised in that between substrate and coating (2) an intermediate layer (4) is provided which balances out thermal expansions, said balancing out taking place due to a thermal expansion coefficient whose value lies between that of the substrate and of the coating (2) and/or takes place due to that fact that the intermediate layer (4) has a smaller density and a considerably smaller modulus of elasticity than that of the neighbouring materials.
Claim 10
Dependent Claim
43 words
Implant according to claim 9, characterised in that the intermediate layer (4) consists of graphite, glassy carbon or pyrolytic carbon, the intermediate layer (4) forming particularly in the case of a metallic substrate an alloy of the materials of coating (2) and substrate.
References Cited (Backward Citations)
No citation records indexed.
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