Device for selectively producing incremental joint movement in a patient in opposite directions
US4938230A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 31, 1989 |
| Grant date | Jul 3, 1990 |
| Priority date | — |
| Expiry date | Mar 31, 2009 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B5/4528
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A device for selectively providing precise incremental joint movement in a patient in either of two opposite directions with a tactile and audible feedback "click", includes first and second spaced disposable retractors for engaging respective parts of the patient adjacent the joint. One of the retractors is mounted on a fixed, inverted, U-shaped support member, and the other retractor is mounted on a movable actuating rod slidably mounted in the support member. The device is formed entirely of non-magnetic material and is readily operable by the patient, making the device especially useful in magnetic resonance imaging procedures. An operating mechanism for the actuating rod includes a pivoted operating handle having an integral drive pawl, and a retaining mechanism for the actuating rod includes a pair of resilient retaining or holding pawls pivoted on the support member adjacent opposite sides of the drive pawl. The operating handle is pivoted on a rockable lifting lever of a retractor quick-release mechanism, so that rocking of the lifting lever raises the handle which, in turn, raises and pivots the holding pawls to release the actuating rod so that it can be readily moved by …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.