Surgery – Instruments – Cutting – puncturing or piercing
Patent
1996-02-16
1998-06-30
Lewis, William
Surgery
Instruments
Cutting, puncturing or piercing
606170, 30237, A61B 1732
Patent
active
057726760
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an endoscopic cutting device for severing intracorporal samples, for example, organs or parts of organs, tumors and vessels.
STATE OF THE ART
Accordingly there are numerous suggestions for endoscopic cutting devices:
WO 92/11816 describes a medical cutting instrument, which is provided with a cutting device borne at the distal shaft end thereof in such a manner that it rotates about its longitudinal axis, this cutting device cutting and even cutting up into small pieces propellerlike the to-be-processed corporal samples.
The cutting-up into small pieces procedure occurs in an advantageous manner inside a cover in such a manner that the cut-up small pieces can be easily removed with the cover to the outside through the entry channel.
Disadvantageous is, however, that cut-up small sample pieces are suited to a limited extent for exact histological examination, in particular, as the original form of the severed part of the body has been practically completely lost due to the arbitrary cutting up.
Other cutting devices for severing intracorporal samples are known which are schematically shown in FIGS. 1a and 1b. These are so-called loop cutting devices which are provided at their distal end with wire loops which can vary in the diameter of the loops.
The severance of parts of organs of more stable consistency requires a high cutting force in order to obtain clean cut surfaces. This can be achieved by using as thin as possible cutting wires. However, there is the problem that tear resistency and break resistency of this type of wires is drastically reduced with decreasing wire diameter. In particular, the wires have to undergo quite extreme curvatures when they are drawn together, i.e, during the cutting process. Frequently, in the smallest opening state of the loop, the cutting wires are bent and as a result break at this site.
The object of the present invention is to provide an endoscopic cutting device for severing tissue, such as organs or parts of organs, with which the severance of the to-be-removed and to-be-examined corporal samples and for the cutting up of this sample necessary for the removal of the sample occurs in a controlled manner in such a way that will permit histological examination of the corporal sample as a whole. This means that subsequently all the pieces of the sample can be put back together to form a whole sample.
Moreover, the invented cutting device should be so stable that even samples of relatively strong consistency and firmness can be severed.
BRIEF DESCRIPTION OF THE INVENTION
An element of the present invention is that it is based on an endoscopic cutting device for severing tissue, such as organs, parts of organs or the like, having and which is provided with a cutting blade, and attached at the proximal end of the device, cutting blade is disposed approximately parallel to a longitudinal unit, the length of which can be varied.
Contrary to the known cutting devices, the invented cutting device is provided with a stationary cutting blade against which the to-be-severed corporal sample is pressed with the aid of the longitudinal unit.
According to a preferred but optional feature of the invention, the longitudinal unit is composed of two elastic bands, which rest in a tautened state along both sides of the cutting blade, which usually is designed straight. The tautened state of the bands can be varied via an actuating unit provided at the proximal end of the instrument.
The elastic bands are firmly fixed at the distal end of the instrument and slide at the other end of the cutting head by means of corresponding guide grooves inside the neck (sometimes called a "support") of the instrument and are finally connected to the actuating unit at the proximal end of the overall instrument.
This arrangement permits, in the untautened state of the elastic bands, forming a bay (sometimes call an "opening"), which is bordered on the one side by the bow-shaped course of the band and on the other side by the straight cutting blade. Th
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patent: 5064428 (1991-11-01), Cope et al.
patent: 5201741 (1993-04-01), Keine
patent: 5509923 (1996-04-01), Middleman et al.
Cuschieri Alfred
Frank Tim
Karl Storz GmbH & Co.
Lewis William
Mon Donald D.
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