Surgery – Instruments – Blood vessel – duct or teat cutter – scrapper or abrader
Patent
1995-05-23
1998-03-10
Jackson, Gary
Surgery
Instruments
Blood vessel, duct or teat cutter, scrapper or abrader
128751, A61B 1722
Patent
active
057255431
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a medical instrument for removing deposits in the walls of arteries and/or veins, having a partially hollow body suitable for insertion into such vessels, a traction and/or actuation means that can be removed from the vessels, and cutting bodies with cutting edges disposed toward the traction direction, which cutting bodies remove the deposits.
2. Description of Prior Art
In known instruments of this type, as taught, for example, by U.S. Pat. No. 4,765,332, an approximately cylindrical base body is provided that has cutting portions that are likewise cylindrical and that point in the traction direction. The sharp edges of the cutting portions taper from the inside outward, which can cause injury even to healthy vessels. In addition, adaptation to the walls of arteries or veins is possible only to a limited extent.
SUMMARY OF THE INVENTION
It is an object of this invention is to provide a medical instrument of the type discussed hereinabove whereby the effective cross section of the instrument can be enlarged simply and adapted to the veins.
This and other objects are attained ,by a medical instrument in accordance with one embodiment of this invention having elements of known medical instruments as set forth hereinabove and further comprising a base body protruding at least partially into the hollow body and cutting bodies extending in the traction direction pivotally connected to said base body.
This instrument can be introduced by a catheter into the vessel up to the intended point, which can be located using a contrast medium. The catheter and the body are disposed in such a way that the plaque is between the body and the catheter. The traction means is then actuated, and the vessel wall at the intended point is scraped off. This process is repeated until the inside wall is smooth. The chips produced in this pinning process can either be removed by suction or entrained by the body, which body is removed from the artery after the operation.
In accordance with one embodiment of this invention, the portion of the base body protruding into the body is a tubular member, in which is disposed a device for adjusting the body relative to the cutting bodies.
This device, in accordance with one embodiment of this invention comprises a length of tube or wire that is actuatable from outside the vessel. Actuation of the device exerts pressure on the cutting bodies, thereby enlarging or shrinking the effective cross section of the cutting body, depending specifically on direction of movement of the body.
In accordance with another embodiment of this invention, the cutting bodies comprise a pivot shaft which extends transversely to the traction direction of the body. This assures that the cutting edges point toward the user, and that the cutting bodies can assume their effective or ineffective position. In the context of this embodiment of the invention, the cutting bodies are embodied as one-or two-armed levers, which, in their rest position, are accommodated entirely or virtually entirely inside the body. The base body comprises a stop member, which, in the rest position of the cutting bodies, is disposed virtually unspaced apart from one end face of the body. The advantage of this embodiment is that introducing the instrument into vessels is facilitated markedly because the cutting edges do not come into contact with the vessel.
In accordance with one embodiment of this invention, the body is essentially embodied as a hollow cylinder which receives the cutting bodies in their rest position.
In accordance with yet another embodiment of this invention the face end, remote from the user, of the body has an opening extending in the traction direction. The opening may serve to receive a guide means, for instance a thin length of wire, by which introducing the instrument to the intended point can be facilitated. Preferably, the face end of the body remote from the user is convex and free of edges.
In accordance with a further embodiment of
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Jackson Gary
Truong Kevin
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