Random surface protrusions on an implantable device
US5507815A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Dec 15, 1994 |
| Grant date | Apr 16, 1996 |
| Priority date | — |
| Expiry date | Dec 15, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24355
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An attachment surface for an implantable device has a random irregular pattern formed through a repetitive masking and chemical milling process. Surface material is removed from the implant surface without stress on the adjoining material and the process provides fully dimensional fillet radii at the base of the surface irregularities. This irregular surface is adapted to receive the ingrowth of bone material and to provide a strong anchor for that bone material. The unitary nature of the substrate and surface features provides a strong anchoring surface with is resistant to cracking or breaking. The surface is prepared through an etching process which utilizes the random application of a maskant and subsequent etching of the metallic substrate in areas unprotected by the maskant. This chemical etching process is repeated a number of times as necessitated by the nature of the irregularities required in the surface. The etching characteristics are controlled by the time, temperature and number of repetitions utilized in the etching process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.