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:
Mar. 02, 1993
Filed:
Oct. 03, 1991
German Borodulin, San Francisco, CA (US);
Maxim Persidsky, San Francisco, CA (US);
Alexander Shkolnik, San Mateo, CA (US);
Marshall Stoller, San Francisco, CA (US);
Urological Instrument Research, Inc., San Francisco, CA (US);
Abstract
An instrument for extracting stones from the urinary tract of a patient comprising a urological catheter (12) and a stone-extracting basket (26) formed from resilient wires and slidingly inserted into catheter (12). The instrument has a drive unit (18) which is connected to the basket via a rod (22). Drive unit (18) transmits to the rod rotation and axial vibrations, which in turn are transmitted to the basket. When rod (22) rotates, curved portion (21) generates radial vibrations which are transmitted to the basket. In order to prevent basket (26) from rotating, but to transmit to it only axial and radial vibrations, rod (24) is connected to basket (26) through a spherical joint (42). On its front end the basket has a filiform (38) which facilitates insertion of the instrument into the urinary tract. In use, after insertion of the catheter to a position in which the basket is aligned with the location of the stone, the basket is released from the catheter and expands. The urologist maneuvers the basket so that the stone is caught inside the basket, and then the basket is pulled back into the catheter to prevent the stone from falling out of the basket. To facilitate extraction, the drive unit is then energized, imparting axial and radial vibrations to the basket, which under these conditions is gradually withdrawn from the patient's body together with the stone caught into the basket.