Importance

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Abstract

The BTR device of the present invention preferably comprises a housing chamber with an attached hand grip and actuating ringlet positioned to be grasped and pulled toward the hand grip. Inside the housing chamber is a hollow, open-ended, helically-slotted cylindrical element having a diagonal groove formed within the outer surface. A travelling pin, attached to the actuating ringlet, is fitted within the diagonal groove such that movement of the actuating ringlet simultaneously moves the travelling pin and rotates the helically-slotted cylindrical element. Gear teeth on the helically-slotted cylindrical element engage gear teeth on an inner shaft element rotatably positioned within the helically-slotted cylindrical element such that rotation of the helically-slotted cylindrical element is transferred to the inner shaft element. Rotation of the inner shaft element simultaneously rotates an attached excision sleeve to permit smooth and simple cutting of a uniform tissue fragment which is then removed through the BTR device without the need to withdraw the BTR device from the surgical access site. A tension spring urges the released actuating ringlet to its original position when the pulling force is withdrawn thereby causing the helically-slotted cylindrical element to rotate reversely. The inner shaft element, and attached excision sleeve, however, do not reversely rotate due to a separating coil which prevents engagement of the gear teeth when the pulling force is withdrawn.

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First Claim