Surgery – Instruments – Blood vessel – duct or teat cutter – scrapper or abrader
Patent
1998-07-16
2000-03-28
Buiz, Michael
Surgery
Instruments
Blood vessel, duct or teat cutter, scrapper or abrader
606180, A61B 1722
Patent
active
060425938
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an abrasive or cutting instrument with a rotating blade having an abrasive or cutting region at its distal end in accordance with the introductory clause of Patent claim 1.
Such abrasive or cutting instruments, which are also termed scrapers or rasps, are employed in endoscopic surgery, e.g. in micro arthroplasty operations.
PRIOR ART
Shaving or cutting instruments of the claimed general type include at least one blade which is rotated at a speed of up to 1,600 or more revolutions per minute. To this end the blade is connected via a shaft to a motor accommodated in the proximal section of the instrument.
The shaft may be a hollow shaft. The passage formed by this configuration is connected to a suction opening in the face area of the blades, which present normally a cylindrical configuration. In this manner it is possible to exhaust liquid and severed tissue particles through the blade.
The known removal or cutting instruments involve, however, the problem that abraded or cut-off tissue particles may adhere to the blade and hence induce the risk of soiling, of blade "clogging" and/or transfer of tissue particles.
BRIEF DESCRIPTION OF THE INVENTION
The present invention is based on the problem of improving an abrasive or cutting instrument in accordance with the introductory clause of claim 1 in a way that tissue particles will be prevented from adhering to the blade.
One inventive solution to this problem is defined in Patent claim 1. Improvements of the invention are the subject matters of the claims 2 et seq.
In accordance with the invention an additional irrigation passage is provided through which an irrigation or flushing liquid is passed to the distal end for cleaning the blade and for assistance in exhausting the severed or abraded tissue particles. It is preferred that the irrigation liquid does not enter the body cavity into which the instrument is introduced but is rather exhausted again immediately after it has rinsed and thus cleaned the blade (claim 11).
The inventive instrument is thus suitable for application not only in organs filled with an irrigating liquid, as is the case in arthroscopy, but also in body regions which can or should not be filled with the irrigating liquid. The inventive instrument can hence be used in ENT surgery, e.g. in the region of the nasal cavity.
The irrigation passage, which is provided in accordance with the invention, does not only serve to clean the blade but it reduces also the risk of clogging in exhaust passages with small lumina which present a typical inside diameter of 1 to 3 mm in ENT applications.
In the improvement defined in claim 2 the suction passage is centrally arranged. There the suction passage may be provided particularly in the drive tube of the rotating blade.
In accordance with claim 3 a handpiece is provided which receives the drive unit and is designed, in particular, in a way that the operator will be able to use the inventive instrument in an ergonomic way.
The basic inventive idea to provide an additional irrigation passage in an abrasive or cutting instrument of the claimed general type may be applied, on principle, in instruments of any configuration whatsoever, e g. in instruments provided only with a rotating blade. The fundamental inventive idea is particularly expedient, however, in instruments provided with a rotating inner blade and a stationary outer blade (claim 4). With these instruments it happens especially frequently that severed tissue particles become stuck in the narrow gap between the inner and outer blades. The claims 5 to 8 define various alternatives of the arrangement of the irrigation passage, For instance, the gap between the inner and outer blades may constitute the irrigation passage. This configuration presents the advantage that the gap is thus cleaned with a particularly high efficiency even though the increased expenditure in terms of structure might be a disadvantage. The alternatives defined in claims 6 and 7 have a design which is comparativ
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Novak Pavel
Solingen Simon
Storz, deceased Karl
Buiz Michael
Goldberg Jonathan D.
Storz Endoskop GmbH
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