Surgery – Instruments – Blood vessel – duct or teat cutter – scrapper or abrader
Patent
1996-06-10
1998-12-01
Thaler, Michael H.
Surgery
Instruments
Blood vessel, duct or teat cutter, scrapper or abrader
A61B 1722
Patent
active
058431020
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to the treatment and cleaning of blood vessels.
BACKGROUND OF THE INVENTION
It is known that narrowing or blockages (thromboses) can occur in blood vessels, particularly in older people. This is often caused by the effects of silting leading to hardening or calcifying of the blood vessels and their walls. This has dangerous consequences for the health, because the quantity of blood now able to flow through the blood vessel is drastically reduced. In order for effective blood circulation to occur and to avoid possible limb amputation for example, any blockage or obstacle in the blood vessels must be removed.
A device for the treatment of blood vessels is already known from the French patent application FR-A-2 635 962, which describes a device for completely removing varicose veins.
A complicated operation is presently necessary if hardening of the blood vessels occurs. In the case of the artery between the groin and the knee, this is quite a severe operation. The patient is cut open at the groin and the knee, whereafter the artery is completely removed and replaced by an artificial artery. This can be especially hard on and dangerous for old people particularly because of the duration of the operation. The operation is also expensive and incorporates a lengthy hospital recovery period for the patient. Additionally there is a danger of rejection of the artificial blood vessel by the body which can lead to further post operation complications.
There is thus a need for a quicker, less expensive, patient friendly procedure, for the cleaning of blood vessels, which obviates the above cited problems.
SUMMARY OF THE INVENTION
According to an aspect of the invention, an instrument is provided for treating a blood vessel comprising: loosening means of such a form as to pass between the wall of a blood vessel and the intima or tunica, which lines the inside of a blood vessel wall, for loosening the intima or tunica from the inside of the blood vessel wall; cutting through means for cutting through and severing the loose intima or tunica at a predetermined distance within the blood vessel, wherein the blood vessel wall is left substantially intact and in place; and support means for supporting the loosening and cutting means.
The intima is a sort of innertube or innerlayer which is to some extent secured to the inner side of a blood vessel wall. All blood vessel blockages are found within the intima and thus it is sufficient, in order to remove these possible blockages from the blood vessel, to cut through the intima and remove it from the blood vessel. On removing an intima, a new intima grows to replace the old one. According to the present invention an instrument is provided which via a small incision can be pushed into the blood vessel, whereby the intima is separated from the blood vessel wall. The instrument then cuts through the intima at a required distance, for example where the hardening ends, whereafter the blockage can be removed by pulling the instrument back out of the blood vessel or by any other suitable method.
A blood vessel is able to be cleaned in this manner so that the need for a time consuming, expensive operation which is harsh on the patient is removed. The requirement of an artificial replacement blood vessel is no longer present, because the old blood vessel is now in a state to again effectively fulfill its function. Therefore rejection of an artificial blood vessel by the body, and its ensuing problems, do not play a role here. The hospital recovery period is shortened due to the less exacting nature of this operation, whereby the-costs decrease and more hospital beds become available.
The loosening means preferably comprise a ring part with blunt edge. The ring part preferably has a cross section in the form of a truncated cone, the nose of which projects in the direction of the incision. In this way the blunt edge separates the intima from the blood vessel wall when the instrument is pushed between the intima and the blood vesse
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G. Ho, et al., "The mollring cutter.TM. remote endarterectomy: preliminary experience with a new endovascular technique for treatment of occlusive superficial femoral artery disease," Journal of Endovascular Surgery, 2(3) :278 (1995).
H. Joosten et al., "The mollring cutter.TM. remote endarterectomy," Clinical Ischaemia, 6(1) :14 (in existence as of May 30, 1996).
Remote endarterectomy using the ring strip cutter technique (in existence as of May 31, 1996).
Kalmann Menno
Moll Franciscus Laurens
Medtronic Inc.
Thaler Michael H.
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