The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 31, 1990
Filed:
Nov. 14, 1988
Dan ANG.kerfeldt, Uppsala, SE;
C. R. Bard, Inc., Murray Hill, NJ (US);
Abstract
The present invention briefly refers to a driving unit (1) for a device for tissue-sampling. The device comprises in addition to the driving unit a needle unit comprising a hollow outer needle (7a) and slidably disposed therein an inner needle (7b), the driving unit (1) being used to propel the needles (7a, 7b). The driving unit comprises a driving device for each needle and each driving device in turn comprises a spring mechanism adapted to be pre-tensioned. The driving unit in addition comprises an inner guide sleeve (3) containing two successive needle holders (4a, 4b) adapted to be shifted in relation to each other in the longitudinal direction of the sleeve and adapted to be pre-tensioned in the same direction for propelling the needles (7a, 7b) with the aid of one spring (5a, 5b) each and which are provided with releasable locking means (33a, 33b). A manual triggering device (6) is provided for releasing the one needle holder (4 b) which in turn is adapted during the final phase of its propulsion to release the other needle holder (4a). A tensioning sleeve (2) which rotatably surrounds the guide sleeve (3) is provided with cam surfaces cooperating with the needle holders (4a, 4b) to pretension them against the spring force.