Implantable metallic open-celled lattice/polyethylene composite material and devices
US6087553A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 6, 1997 |
| Grant date | Jul 11, 2000 |
| Priority date | — |
| Expiry date | Nov 6, 2017 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61F2310/00544
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A method for making a composite material for implantation in the body which is able to act as a matrix for the biological ingrowth of bone and is suitable as a bearing surface. The method consists of compression molding the implant by forming to net shape the first material to its desired end device and inserting it into a mold cavity. Polyethylene in is then placed onto the first material, and the mold is subjected to heat and pressure for specific time durations. The end result is polyethylene which is fully interdigitated into the first material to a desired depth which is controlled by temperature, pressure and time constraints. The present method creates an interface between the first material and the polyethylene which is securely fixed and does not allow micro and macro motion between the two materials. The compression molding process optimizes the mechanical and wear properties of the polyethylene, and enables the new material to provide a smooth and frictionless bearing surface on one side of the composite material. The opposite side of the composite material is porous and thus allows for biological ingrowth of new bone or cement interdigitation. The first material provide…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.