WO2008104275A1 - Resectoscope having a ceramic insulating body - Google Patents

Resectoscope having a ceramic insulating body Download PDF

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Publication number
WO2008104275A1
WO2008104275A1 PCT/EP2008/001089 EP2008001089W WO2008104275A1 WO 2008104275 A1 WO2008104275 A1 WO 2008104275A1 EP 2008001089 W EP2008001089 W EP 2008001089W WO 2008104275 A1 WO2008104275 A1 WO 2008104275A1
Authority
WO
WIPO (PCT)
Prior art keywords
insulating body
ceramic
resectoscope
cutting electrode
shaft tube
Prior art date
Application number
PCT/EP2008/001089
Other languages
German (de)
French (fr)
Inventor
Dido Arnim ZWEIBRÜCK
Original Assignee
Olympus Winter & Ibe Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Olympus Winter & Ibe Gmbh filed Critical Olympus Winter & Ibe Gmbh
Publication of WO2008104275A1 publication Critical patent/WO2008104275A1/en

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Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B18/04Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
    • A61B18/12Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
    • A61B18/14Probes or electrodes therefor
    • A61B18/149Probes or electrodes therefor bow shaped or with rotatable body at cantilever end, e.g. for resectoscopes, or coagulating rollers
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B2018/00053Mechanical features of the instrument of device
    • A61B2018/00059Material properties
    • A61B2018/00071Electrical conductivity
    • A61B2018/00083Electrical conductivity low, i.e. electrically insulating

Definitions

  • the invention relates to a urological resectoscope according to the preamble of claim 1.
  • a generic resectoscope is known from DE 10164808 Al.
  • the loop-shaped cutting electrode can be extended in the distal direction in front of the edge of the insulating body and can cut there tissue strips under Hochfrequenzbeetzung. Upon retraction of the cutting electrode, the fabric strip is cut off against the distal edge of the insulator.
  • the cutting electrode must be very close to the insulating body, in order to be able to cut clean.
  • the insulator is needed to insulate the high frequency loaded cutting electrode against the metal shaft tube. Due to its insulating property of the insulating body prevents contact with the cutting electrode a short circuit with respect to the shaft tube.
  • the insulator was made of plastic, which burned quickly due to the very hot cutting electrode.
  • DE 32 23 361 Al An attempt was made to protect the plastic by embedded, highly thermally conductive ceramic fibers which are intended to dissipate the heat from the areas subjected to high thermal stress.
  • this document provides to form the particularly highly stressed edge portion completely made of ceramic.
  • the material used today is zirconium oxide (ZrO 2).
  • the object of the present invention is to form a generic rectoscope steadier.
  • the invention is based on the recognition that the local thermal overloading of the ceramic by the wire of the cutting electrode generates too high thermal stresses, which leads to fractures.
  • the inventive use of a more thermally conductive ceramic leads to the local heat peaks distributed and thus cracking is avoided.
  • the simple one-piece design of homogeneous material can be maintained.
  • silicon nitrite SisN ,. ⁇
  • SisN ,. ⁇ silicon nitrite
  • the tubular insulating body forming the end region of the shaft tube made of metal consists of a ceramic which has high thermal conductivity and is sufficiently resistant to breakage.
  • the insulator consists of silicon nitrite (Si3N4). It can the
  • Insulating body made entirely of this material or at least in its most vulnerable area, namely at its distal edge, in the area in which the cutting, hot cutting electrode comes in the immediate vicinity of the ceramic.

Abstract

The invention relates to a urological resectoscope having a tubular insulating body made of ceramic that forms the end region of a shaft tube made of metal, in which a loop-shaped cutting electrode, to which a high frequency can be applied, is disposed at a small distance to the insulating body, characterized in that the insulating body is made of a highly heat conductive, break-resistant ceramic material.

Description

Uns. Zeichen 04377pct OLYMPUS WINTER & IBE GMBH Us. Symbol 04377pct OLYMPUS WINTER & IBE GMBH
Resektoskop mit KeramikisolierkörperResectoscope with ceramic insulation
Die Erfindung betrifft ein urologisches Resektoskop nach dem Oberbegriff des Anspruches 1.The invention relates to a urological resectoscope according to the preamble of claim 1.
Ein gattungsgemäßes Resektoskop ist aus der DE 10164808 Al bekannt. Die schlingenförmige Schneidelektrode läßt sich in distaler Richtung vor den Rand des Isolierkörpers ausfahren und kann dort unter Hochfrequenzbeaufschlagung Gewebestreifen schneiden. Beim Rückziehen der Schneidelektrode wird der Gewebestreifen gegen den distalen Rand des Isolierkörpers abgeschnitten. Die Schneidelektrode muß dazu dem Isolierkörper sehr eng anliegen, um sauber abschneiden zu können.A generic resectoscope is known from DE 10164808 Al. The loop-shaped cutting electrode can be extended in the distal direction in front of the edge of the insulating body and can cut there tissue strips under Hochfrequenzbeaufschlagung. Upon retraction of the cutting electrode, the fabric strip is cut off against the distal edge of the insulator. The cutting electrode must be very close to the insulating body, in order to be able to cut clean.
Der Isolierkörper wird benötigt, um die hochfrequenzbeaufschlagte Schneidelektrode gegen das aus Metall bestehende Schaftrohr zu isolieren. Durch seine isolierende Eigenschaft verhindert der Isolierkörper bei Berührung mit der Schneidelektrode einen Kurzschluß gegenüber dem Schaftrohr.The insulator is needed to insulate the high frequency loaded cutting electrode against the metal shaft tube. Due to its insulating property of the insulating body prevents contact with the cutting electrode a short circuit with respect to the shaft tube.
Bei älteren Resektoskopen bestand der Isolierkörper aus Kunststoff, der durch die sehr heiße Schneidelektrode jedoch schnell verbrannte. Gemäß DE 32 23 361 Al wurde versucht, den Kunststoff durch eingelagerte, gut wärmeleitfähige Keramikfasern zu schützen, die aus den thermisch hoch beanspruchten Bereichen die Wärme ableiten sollen. Zusätzlich sieht diese Schrift vor, den besonders hoch beanspruchten Kantenbereich vollständig aus Keramik auszubilden.In older resectoscopes, the insulator was made of plastic, which burned quickly due to the very hot cutting electrode. According to DE 32 23 361 Al An attempt was made to protect the plastic by embedded, highly thermally conductive ceramic fibers which are intended to dissipate the heat from the areas subjected to high thermal stress. In addition, this document provides to form the particularly highly stressed edge portion completely made of ceramic.
Heutige Isolierkörper von Resektoskopen bestehen jedoch homogen aus Keramik mit sehr hoher Wärmebeständigkeit. Damit wurden alle früheren Probleme gelöst, zumal Keramiken heute auch mit ausreichender Bruchfestigkeit verfügbar sindHowever, today's insulators of resectoscopes are homogeneously made of ceramics with very high heat resistance. This solved all previous problems, especially as ceramics are now available with sufficient breaking strength
Bei den derzeit für diese Zwecke verwendeten Keramiken wird insbesondere Wert gelegt auf hohe Wärmebeständigkeit und Bruchfestigkeit. Der heute übliche Werkstoff ist Zirkonoxyd (Zrθ2).In the ceramics currently used for these purposes, particular importance is attached to high heat resistance and breaking strength. The material used today is zirconium oxide (ZrO 2).
Es hat sich jedoch herausgestellt, daß auch aus Keramik bestehende Isolierkörper durch die heiße Schneidelektrode beschädigt werden können, insbesondere bei dem heute zunehmend verwendeten Verfahren, nach dem in durch Salzanreicherung leitfähig gemachter Flüssigkeit gearbeitet wird. Es entsteht dabei um die Schneidelektrode ein Plasma, dessen extreme Temperaturen auch Keramik überlasten können. Es kann zu bereichsweiser Zerstörung des Isolierkörpers kommen, insbesondere im Bereich seines distalen Randes, an dem er in enge Nähe mit der hochfrequenzbeaufschlagten Schneidelektrode kommt.However, it has been found that even ceramic existing insulator can be damaged by the hot cutting electrode, especially in the increasingly used today method, according to which is made conductive in liquid by salt enrichment. The result is the cutting electrode, a plasma whose extreme temperatures can also overload ceramics. It may lead to regional destruction of the insulator, in particular in the region of its distal edge, where it comes into close proximity with the hochfrequenzbeaufschlagten cutting electrode.
Die Aufgabe der vorliegenden Erfindung besteht darin, ein gattungsgemäßes Re- sektoskop standfester auszubilden.The object of the present invention is to form a generic rectoscope steadier.
Diese Aufgabe wird mit den Merkmalen des Kennzeichnungsteiles des Anspruches 1 gelöst. Die Erfindung geht von der Erkenntnis aus, dass die örtliche thermische Überlastung der Keramik durch den Draht der Schneidelektrode zu hohe thermische Spannungen erzeugt, die zu Brüchen führt. Die erfindungsgemäße Verwendung einer besser wärmeleitfähigen Keramik führt dazu, dass die örtlichen Wärmespitzen verteilt und somit Rissbildung vermieden wird. Die einfache einstückige Ausbildung aus homogenem Material kann beibehalten werden.This object is achieved with the features of the characterizing part of claim 1. The invention is based on the recognition that the local thermal overloading of the ceramic by the wire of the cutting electrode generates too high thermal stresses, which leads to fractures. The inventive use of a more thermally conductive ceramic leads to the local heat peaks distributed and thus cracking is avoided. The simple one-piece design of homogeneous material can be maintained.
Besonders geeignet ist nach Anspruch 2 Siliziumnitrit (SißN,.}), das sich insbesondere durch hohe Wärmeleitfähigkeit und hohe Temperaturwechselbeständigkeit auszeichnet und in diesen Punkten dem heute üblicherweise verwendeten Zirkonoxyd weit überlegen ist.Particularly suitable is according to claim 2 silicon nitrite (SissN ,.}), which is characterized in particular by high thermal conductivity and high thermal shock resistance and is far superior to the zirconia commonly used today in these points.
Bei einem erfindungsgemäßen Resektoskop besteht der den Endbereich des aus Metall bestehenden Schaftrohres bildende rohrförmige Isolierkörper aus einer Keramik, die hohe Wärmeleitfähigkeit aufweist und ausreichend bruchfest ist. Insbesondere besteht der Isolierkörper aus Siliziumnitrit (Si3N4). Dabei kann derIn a resectoscope according to the invention, the tubular insulating body forming the end region of the shaft tube made of metal consists of a ceramic which has high thermal conductivity and is sufficiently resistant to breakage. In particular, the insulator consists of silicon nitrite (Si3N4). It can the
Isolierkörper vollständig aus diesem Material bestehen oder wenigstens in seinem besonders gefährdeten Bereich, nämlich an seinem distalen Rand, in dem Bereich, in dem die schneidende, heiße Schneidelektrode in unmittelbare Nähe der Keramik kommt. Insulating body made entirely of this material or at least in its most vulnerable area, namely at its distal edge, in the area in which the cutting, hot cutting electrode comes in the immediate vicinity of the ceramic.

Claims

Uns. Zeichen 04377pct OLYMPUS WINTER & IBE GMBHResektoskop mit KeramikisolierkörperPATENTANSPRÜCHE: Us. Sign 04377pct OLYMPUS WINTER & IBE GMBVesector with Ceramic InsulatorPATENTIAL CLAIMS:
1. Urologisches Resktoskop mit einem den Endbereich eines aus Metall bestehenden Schaftrohres bildenden rohrförmigen Isolierkörper aus Keramik, in dem eine hochfrequenzbeaufschlagbare, schlingenförmi- ge, in Richtung des Schaftrohres vorschiebbare Schneidelektrode in geringem Abstand zum Isolierkörper angeordnet ist, dadurch gekennzeichnet, daß der Isolierkörper aus einer hochwärmeleitfähigen, bruchfesten Keramik besteht.1. Urological resectoscope with a the end of an existing metal shaft tube forming tubular insulating body made of ceramic, in which a hochfrequenzbeaufschlagbare, schlingenförmi- ge, in the direction of the shaft tube advanceable cutting electrode is located at a short distance from the insulator, characterized in that the insulating body of a highly heat-conductive, unbreakable ceramic.
2. Resektoskop nach Anspruch 1, dadurch gekennzeichnet, dass der Isolierkörper aus Siliziumnitrit (Si3N4) besteht. 2. resectoscope according to claim 1, characterized in that the insulating body of silicon nitride (Si3N4) consists.
PCT/EP2008/001089 2007-03-01 2008-02-13 Resectoscope having a ceramic insulating body WO2008104275A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007010442A DE102007010442A1 (en) 2007-03-01 2007-03-01 Resectoscope with ceramic insulation
DE102007010442.3 2007-03-01

Publications (1)

Publication Number Publication Date
WO2008104275A1 true WO2008104275A1 (en) 2008-09-04

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DE (1) DE102007010442A1 (en)
WO (1) WO2008104275A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9949630B2 (en) 2009-11-04 2018-04-24 The Trustees Of The University Of Pennsylvania Medical instrument system and method for manipulating target tissue

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4060086A (en) * 1976-05-24 1977-11-29 Karl Storz Endoscope with an operating device
WO1998043531A1 (en) * 1997-04-01 1998-10-08 Vilos George A Debris aspirating resectoscope
DE10042097C1 (en) * 2000-08-26 2001-12-20 Winter & Ibe Olympus Urological resectoscope for prostate surgery has proximal end of electrode carrier secured and electrically contacted within sliding body
US20040153057A1 (en) * 1998-11-20 2004-08-05 Arthrocare Corporation Electrosurgical apparatus and methods for ablating tissue

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3223361A1 (en) 1982-06-23 1983-12-29 Olympus Winter & Ibe GmbH, 2000 Hamburg HIGH-FREQUENCY RESECTOSCOPE WITH INSULATION TIP
DE10122465C5 (en) 2001-05-09 2004-07-22 Olympus Winter & Ibe Gmbh Urological resectoscope with isolating body

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4060086A (en) * 1976-05-24 1977-11-29 Karl Storz Endoscope with an operating device
WO1998043531A1 (en) * 1997-04-01 1998-10-08 Vilos George A Debris aspirating resectoscope
US20040153057A1 (en) * 1998-11-20 2004-08-05 Arthrocare Corporation Electrosurgical apparatus and methods for ablating tissue
DE10042097C1 (en) * 2000-08-26 2001-12-20 Winter & Ibe Olympus Urological resectoscope for prostate surgery has proximal end of electrode carrier secured and electrically contacted within sliding body

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9949630B2 (en) 2009-11-04 2018-04-24 The Trustees Of The University Of Pennsylvania Medical instrument system and method for manipulating target tissue

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