Method for producing reduced porosity bone cement
US5328262A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 3, 1993 |
| Grant date | Jul 12, 1994 |
| Priority date | — |
| Expiry date | Feb 3, 2013 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01F2101/20
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method for producing bone cement by mixing components forming part thereof, whereby mixing occurs in vacuum in a mixing device (1) and whereby ready-mixed bone cement (2) is collected in the mixing device (1) before it is ejected or discharged therefrom. For reducing the volume of porosity of the pores formed in the bone cement (2) during collection, the bone cement (2) is collected in vacuum to provide vacuum in those pores in the bone cement (2) which are formed during collection, whereby the volume of porosity in the bone cement (2) is reduced when the bone cement is subjected to atmospheric pressure after collection. A device for carrying out this method comprises a movable member (6), preferably a movable piston, which is adapted for pressing out or discharging bone cement (2) from the mixing device (1), which is fixedly mounted for maintaining its position when bone cement (2) is mixed in vacuum and which is releasable such that it can be sucked into the mixing device (1) towards a discharge opening (13 ) when vacuum prevails in said mixing device (1) for collecting or gathering bone cement (2) in said mixing device (1) closest to the discharge opening (13).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.