초록 ▼

The invention is for a biopsy instrument having a stationary shaft secured to which is a stylet such that, once secured, the stylet does not move relative to the instrument. The stylet is telescopically received by a cannula which is mounted to a spring-loaded guide; the cannula and the guide move b

The invention is for a biopsy instrument having a stationary shaft secured to which is a stylet such that, once secured, the stylet does not move relative to the instrument. The stylet is telescopically received by a cannula which is mounted to a spring-loaded guide; the cannula and the guide move between charged and discharged positions. Also provided is a safety cap, which travels within slots formed in opposite sides of the cylindrical casing that houses the shaft, the guide and the spring. Retracting the safety cap moves the guide and the cannula from the discharged to the charged position where a release lever engages the guide. The safety cap covers the release lever to prevent accidental actuation of the instrument. The instrument is fired by sliding the safety cap forward and depressing the exposed release lever, which allows the spring to drive the cannula forward, toward the discharged position and over the stationary stylet, so that a tissue sample may be taken.

대표청구항 ▼

A biopsy instrument comprising an elongate hollow casing, a needle extending outwardly from the casing and having a cannula and a stylet received within the cannula, a stationary support mounted within the casing in fixed relation thereto and having means affixing the stylet thereto, a guide having

A biopsy instrument comprising an elongate hollow casing, a needle extending outwardly from the casing and having a cannula and a stylet received within the cannula, a stationary support mounted within the casing in fixed relation thereto and having means affixing the stylet thereto, a guide having means affixing the cannula thereto and being carried within the casing for reciprocating movement relative to the stationary support between a charged position, wherein the cannula is retracted in a direction away from the distal end of the stylet, and a discharged position, wherein the cannula is displaced from the charged position in the direction of the distal end of the stylet, relative to the charged position, a coil spring engaged between the stationary support and the guide to urge the guide toward the discharged position, a manually operable charging member surrounding the casing and being mounted thereon for reciprocal sliding movement relative thereto, the charging member having means engageable with the guide to move the guide to the charged position against the urging of the spring, and a release lever having means engageable with the guide for retaining the guide in the charged position, the release lever being manually actuable from without the casing to release the guide for movement to the discharged position.