Surgery – Instruments – Internal pressure applicator
Patent
1996-12-11
1998-02-24
Buiz, Michael
Surgery
Instruments
Internal pressure applicator
606127, A61M 2900
Patent
active
057207640
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention is directed to a vena cava thrombus filter with a catheter for insertion in a vein, this catheter having a tube of flexible plastic with a guiding and holding wire supported therein so as to be displaceable axially, its insertion end having a filter element formed of thin wires which can expand elastically inside a vein and which, in the pushed forward position outside of the catheter insertion end, expand to form a basket through which liquid can flow.
Insertion of a vena cava filter is indicated absolutely, for example, with thrombolyses for temporary prophylaxis of pulmonary emboli due to detaching thrombi or fragments of such thrombi.
2. Description of the Prior Art
Known devices for intercepting and/or removing such thrombi in the blood circulation are usually made of plastic and can kink when loaded, causing impairment of function. Known vena cava thrombus filters are also often complicated in construction and handling.
A device for filtering blood in the blood vessels of a patient is known from EP-A-0 472 334. It comprises a catheter with a guiding and holding wire which is supported therein so as to be displaceable axially. An expandable filter element formed of a plurality of wires which can expand to form a basket is arranged at the distal end of the guiding and holding wire. The wires can open out or draw together depending on the axial displacement of the guide wire inside the blood vessel relative to the filter.
EP-A-0 117 940 describes a similar device with a thrombus filter at the distal end of a catheter which can be introduced in a vein. In this device the filter element is formed of memory wires which can be curled up into loops and which can be collapsed when inserted into the vein by stretching the guide wire or expanded in the vein to form loops by the opposite movement of the guide wire. A liquid may be injected into the vein through the catheter via a branch of the fitting at the guide end.
SUMMARY OF THE INVENTION
The object of the present invention is to provide an improved temporary vena cava thrombus filter with a catheter for insertion in a vein by means of which detaching thrombi or fragments thereof can be filtered out of the blood circulation in cases of thrombolysis, thrombectomy or pregnancy entailing risk so as to safely prevent the risk of pulmonary embolism. The filter is designed to enable optional access via all known routes of access, e.g., veins of the arm (basilic vein, brachial vein, jugular vein, subclavian vein, femoral vein). Accordingly, the catheter must be very thin and flexible like an angiogram catheter so that it can remain in place for the duration of clot fragmentation or lysis.
According to the invention, a vena cava thrombus filter is provided which includes a catheter for insertion in a vein including a tube of flexible plastic and a guiding and holding wire supported and axially displaceable in the tube. The distal end of the wire has a filter element formed of wires which are elastically expandable inside a vein, wherein, in a forwardly pushed position outside of the catheter insertion end, the wires can expand to form a basket through which liquid can flow. The catheter has at the handling end of the guiding and holding wire a handle, and a fitting closable to irrigation fluid provided with a bayonet lock for fastening the handle relative to the fitting. The fitting has a metallic guide sleeve, wherein the flexible tube of the catheter is pulled over the metallic guide sleeve. A flexible rubber or plastic sleeve is arranged over the metallic guide sleeve and the flexible tube pulled over the metallic guide sleeve. This object is met in a vena cava thrombus filter having a catheter for insertion in a vein by its construction corresponding to the characterizing features of claim 1.
It is very advantageous that all important veins and vein branches can be accessed by the vena cava thrombus filter in its closed state in which the flexible wires are folded together when retracted in
REFERENCES:
patent: 5222971 (1993-06-01), Willard et al.
patent: 5330482 (1994-07-01), Gibbs et al.
patent: 5496330 (1996-03-01), Bates et al.
Buiz Michael
Kueffner Friedrich
Truong Kevin
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