WO1995029640A1 - Sleeved surgical instrument - Google Patents

Sleeved surgical instrument Download PDF

Info

Publication number
WO1995029640A1
WO1995029640A1 PCT/EP1995/000998 EP9500998W WO9529640A1 WO 1995029640 A1 WO1995029640 A1 WO 1995029640A1 EP 9500998 W EP9500998 W EP 9500998W WO 9529640 A1 WO9529640 A1 WO 9529640A1
Authority
WO
WIPO (PCT)
Prior art keywords
holder
tube
tubular shaft
extension
electrically insulating
Prior art date
Application number
PCT/EP1995/000998
Other languages
German (de)
French (fr)
Inventor
Markus Nesper
Dieter Weisshaupt
Original Assignee
Aesculap Ag
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 Aesculap Ag filed Critical Aesculap Ag
Publication of WO1995029640A1 publication Critical patent/WO1995029640A1/en

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/28—Surgical forceps
    • A61B17/29—Forceps for use in minimally invasive surgery
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B18/04—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
    • A61B18/12—Surgical 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
    • A61B18/14—Probes or electrodes therefor
    • A61B18/1442—Probes having pivoting end effectors, e.g. forceps
    • A61B18/1445—Probes having pivoting end effectors, e.g. forceps at the distal end of a shaft, e.g. forceps or scissors at the end of a rigid rod

Definitions

  • the invention relates to a surgical tubular shaft instrument with a tube, at the end of which a holder for a tool is detachably held, and with an actuating element arranged in the tube and longitudinally movable therein for moving the tool, with electrical insulation of the tube and the bracket.
  • a surgical tubular shaft instrument of this type is known, for example, from German utility model 9318815.
  • the holder on the outside is covered with a special electrically insulating layer.
  • an insulating outer shell, which surrounds the tube of the tubular shaft instrument, adjoins the holder and fixes the tube in a fixing position, in which the tube is axially immovably connected to the holder of the tools.
  • this object is achieved according to the invention in that the holder as a whole consists of an electrically insulating material.
  • This electrically insulating material can be plastic, for example, but it is particularly advantageous if the holder consists of ceramic.
  • the radial Has recesses in which radially displaceable projections of the tube engage and thereby fix the holder axially, can be provided according to a further development that the radial projections extend only over part of the circumference of the extension and in between parallel to the longitudinal axis of the extension Running webs remain that connect the part of the bracket protruding from the tube with its extension.
  • a particularly advantageous embodiment is obtained if the extension tapers in the area of the recesses towards its end inserted into the tube and if the webs extend into the part with a smaller outside diameter as a continuation of the part of the extension with a larger outside diameter .
  • Figure 1 is a schematic side view of a
  • Tube shaft instrument with tools that can be moved in pliers
  • Figure 2 is a partial perspective view of the tubular shaft instrument of Figure 1 in the connection area between the holder of the tool and the tubular shaft and
  • FIG. 3 a longitudinal sectional view in the connection area of the tool holder and the tubular shaft along line 3-3 in FIG. 2.
  • the tubular shaft instrument 1 shown in the drawing comprises a tubular shaft 2, in the front end of which a holder 3 is inserted, on which two jaw-shaped tools 4, 5 are pivotally mounted about a common axis, thus forming a gripping instrument or pliers.
  • the two tools 4 and 5 are moved by a push and pull rod 6 arranged in the interior of the shaft 2, which emerges from the shaft 2 at the rear end and is articulated there to a handle branch 7, which in turn is connected rotatable on a second handle branch 8 is stored.
  • This second grip branch 8 is rigidly connected to the shaft 2, so that when the two grip branches 7 and 8 are pivoted against each other, the push and pull rods 6 are pushed back and forth inside the shaft.
  • the holder 3 shown in more detail in FIGS. 2 and 3 has a front circular cylindrical section 9 with an axially parallel compartment 10 which is open towards the front and into which the two tools 4 and 5 engage. In this area, the tools 4 and 5 are pivotably supported by a transverse shaft 11. Through a through opening 12 extending from the rear end into the compartment 10, the push and pull rod 6 extends into the compartment 10 and is connected there to gear means, not shown in the drawing, which pivot the tools 4 effect around the bearing shaft 11.
  • a central section 13 adjoins the front section 9 of the holder 3, which is set back on an annular step 14 with respect to the front section and thus has a smaller outside diameter than the front section.
  • this middle section 13 merges via a further step 17 into a rear section 15, the outside diameter of which is once again smaller than that of the middle section 13.
  • An annular groove is immediately connected to the ring step 17 16 in the outer circumference of the rear section 15, through which this rear section 15 is further weakened in the direct connection to the central section 13. This annular groove 16 forms a radial recess in this area.
  • the annular groove 16 does not extend over the entire outer circumference of the rear section 15, but is interrupted by webs 18 which, as a continuation of the middle section 13, extend axially parallel over the annular groove 16 and in turn in the form of a step 19 into the Pass over the lateral surface of the rear section 15.
  • These webs 18, which can be offset from one another by 90 °, for example, and each extend over an angular range of, for example, 20 °, thereby bridge the annular groove 16 and reinforce the holder in the transition region from the central section 13 into the rear section cut 15. The weakening effect of the annular groove 16 is thus at least partially eliminated.
  • the entire holder 3 is formed in one piece and consists of an electrically insulating material, preferably ceramic.
  • the rear section 15 of the holder 3 dips into the tubular shaft 2 and lies against the inner wall thereof.
  • the shaft 2 carries a plurality of resilient tongues 20 which are separated from one another by longitudinal cuts 21 and which carry radial projections 22 which protrude inwards.
  • the longitudinal cuts 21 widen step-wise towards the front end and form there open compartments 23 into which the webs 18 enter in the transition area between the middle section 13 and the rear section 15 of the holder 3.
  • the projections 22 dip into the annular groove 16, and in this position the tongues 20 fixed by a tubular sleeve 24 which is displaceably mounted on the tubular shaft 2 in the axial direction and which embraces the tubular shaft 2 and the holder 3 aligned with this in the central section 13 when they are in the front position ( Figure 3), in which the sleeve 24 abuts the ring step 14.
  • the sleeve 24 consists of electrically insulating material, so that in the transition region of the sleeve consisting of electrically insulating material on the one hand and the holder 3 consisting entirely of electrically insulating material on the other hand, no electrical connection to the outside is possible.

Abstract

In order to facilitate the provision of electrical insulation in the region of the tool holder in a sleeved surgical instrument, consisting of a tube on the end of which is releasably fitted a tool holder and incorporating an actuating component fitted so as to be longitudinally movable in the tube to move the tool, electrical insulation being provided for the tube and the holder, it is proposed that the holder consist entirely of an electrically insulating material.

Description

CHIRURGISCHES ROHRSCHAFTINSTRUMENT SURGICAL TUBE INSTRUMENT
Die Erfindung betrifft ein chirurgisches Rohrschaftin¬ strument mit einem Rohr, an dessen Ende eine Halterung für ein Werkzeug lösbar gehalten ist, und mit einem in dem Rohr angeordneten und in diesem längsbewegbaren Betätigungsele¬ ment zum Bewegen des Werkzeuges, mit einer elektrischen Isolation des Rohres und der Halterung.The invention relates to a surgical tubular shaft instrument with a tube, at the end of which a holder for a tool is detachably held, and with an actuating element arranged in the tube and longitudinally movable therein for moving the tool, with electrical insulation of the tube and the bracket.
Ein derartiges chirurgisches Rohrschaftinstrument ist bei¬ spielsweise aus dem deutschen Gebrauchsmuster 9318815 be¬ kannt. Um ein solches Rohrschaftinstrument an der Außensei¬ te elektrisch isolieren zu können, wird dabei vorgesehen, daß die Halterung an der Außenseite mit einer speziellen elektrisch isolierenden Schicht belegt ist, außerdem schließt sich an die Halterung eine isolierende Außenhülle an, die das Rohr des Rohrschaftinstrumentes umgibt und das Rohr in einer Fixierlage festlegt, in der das Rohr mit der Halterung der Werkzeuge axial unverschieblich verbunden ist. Um hier eine einwandfreie elektrische Isolierung auch im Bereich der Halterung zu erreichen, ist in jedem Fall eine spezielle elektrische Isolationsschicht auf dieser Halte¬ rung notwendig, und dies erfordert komplizierte Herstel¬ lungsschritte, da bei der Herstellung auch sichergestellt werden muß, daß diese Schicht wirklich alle Teile der Hal¬ terung bedeckt und während der Lebenszeit des Rohrschaftin¬ strumentes bedeckt hält.A surgical tubular shaft instrument of this type is known, for example, from German utility model 9318815. In order to be able to electrically isolate such a tubular shaft instrument on the outside, it is provided that the holder on the outside is covered with a special electrically insulating layer. In addition, an insulating outer shell, which surrounds the tube of the tubular shaft instrument, adjoins the holder and fixes the tube in a fixing position, in which the tube is axially immovably connected to the holder of the tools. In order to achieve perfect electrical insulation here also in the area of the holder, a special electrical insulation layer is necessary on this holder, and this requires complicated production steps, since it must also be ensured during production that this layer really does all parts of the holder covered and kept covered during the lifetime of the tubular shaft instrument.
Es ist Aufgabe der Erfindung, ein gattungsgemäßes chirurgi¬ sches Rohrschaftinstrument so auszubilden, daß die elektri¬ sche Isolation im Halterungsbereich einwandfrei mit einfa¬ cheren Mitteln erreicht werden kann.It is an object of the invention to design a generic surgical tubular shaft instrument in such a way that the electrical insulation in the mounting area can be easily achieved with simpler means.
Diese Aufgabe wird bei einem chirurgischen Rohrschaftin¬ strument der eingangs beschriebenen Art erfindungsgemäß da¬ durch gelöst, daß die Halterung insgesamt aus einem elek¬ trisch isolierenden Material besteht.In a surgical tubular shaft instrument of the type described in the introduction, this object is achieved according to the invention in that the holder as a whole consists of an electrically insulating material.
Es wird also nicht in herkömmlicher Weise eine metallische Halterung verwendet, die außenseitig elektrisch isolierend beschichtet wird, sondern es wird abgehend von dieser be¬ kannten Technik die Halterung von vorne herein aus einem elektrisch isolierenden Material hergestellt.It is therefore not conventionally used to use a metallic holder which is coated on the outside in an electrically insulating manner; instead, based on this known technique, the holder is made from the beginning from an electrically insulating material.
Dieses elektrisch isolierende Material kann beispielsweise Kunststoff sein, besonders vorteilhaft ist es jedoch, wenn die Halterung aus Keramik besteht.This electrically insulating material can be plastic, for example, but it is particularly advantageous if the holder consists of ceramic.
Bei einer bevorzugten Ausführungsform mit einer in das Rohr einschiebbaren Verlängerung der Halterung, die radiale Rücksprünge aufweist, in welche radial verschiebbare Vor¬ sprünge des Rohres eingreifen und die Halterung dadurch axial fixieren, kann gemäß einer Weiterbildung vorgesehen werden, daß sich die radialen Vorsprünge nur über einen Teil des Umfanges der Verlängerung erstrecken und dazwi¬ schen parallel zur Längsachse der Verlängerung verlaufende Stege stehenbleiben, die den aus dem Rohr hervorstehenden Teil der Halterung mit ihrer Verlängerung verbinden.In a preferred embodiment with an extension of the holder which can be inserted into the tube, the radial Has recesses in which radially displaceable projections of the tube engage and thereby fix the holder axially, can be provided according to a further development that the radial projections extend only over part of the circumference of the extension and in between parallel to the longitudinal axis of the extension Running webs remain that connect the part of the bracket protruding from the tube with its extension.
Bei der Verwendung elektrisch isolierender Materialien, insbesondere Keramik, können sich Stabilitätsprobleme da¬ durch ergeben, daß diese Materialien geringere Festigkeiten aufweisen als herkömmliche metallische Werkstoffe. Gerade Keramik ist gegenüber Zugbelastungen relativ wenig wider¬ standsfähig, und daher besteht die Gefahr, daß im Bereich der Rücksprünge, die im Stand der Technik als umlaufende Ringnut ausgebildet sind und daher Einkerbungen bilden, Be¬ schädigungen auftreten. Diese Gefahr wird durch die Unter¬ brechung der radialen Rücksprünge in Umfangsrichtung unter¬ bunden, die zwischen den Rücksprüngen stehenbleibenden Ste¬ ge bilden eine Verstärkung, die diesen geschwächten Bereich überbrücken und daher die notwendige Festigkeit sicherstel¬ len.When using electrically insulating materials, in particular ceramics, stability problems can result from the fact that these materials have lower strengths than conventional metallic materials. Ceramics in particular are relatively little resistant to tensile loads, and there is therefore a risk that damage will occur in the area of the recesses, which are formed in the prior art as a circumferential annular groove and therefore form notches. This danger is prevented by interrupting the radial recesses in the circumferential direction, the webs which remain between the recesses form a reinforcement which bridge this weakened area and therefore ensure the necessary strength.
Eine besonders vorteilhafte Ausgestaltung ergibt sich, wenn sich die Verlängerung im Bereich der Rücksprünge zu ihrem in das Rohr eingeschobenen Ende hin stufenförmig verjüngt und wenn sich die Stege als Fortsetzung des Teils der Ver¬ längerung mit größerem Außendurchmesser in den Teil mit ge¬ ringerem Außendurchmesser erstrecken. Dadurch ergibt sich im Übergangsbereich, in dem die radialen Rücksprünge ange¬ ordnet sind, eine optimale Verstärkung, so daß auch bei den geringeren Festigkeitswerten der elektrisch isolierenden Werkstoffe, insbesondere also Keramik, insgesamt eine aus¬ reichende Stabilität erreicht werden kann.A particularly advantageous embodiment is obtained if the extension tapers in the area of the recesses towards its end inserted into the tube and if the webs extend into the part with a smaller outside diameter as a continuation of the part of the extension with a larger outside diameter . This results in an optimal reinforcement in the transition area, in which the radial recesses are arranged, so that also in the lower strength values of the electrically insulating materials, in particular ceramics, sufficient stability overall can be achieved.
Die nachfolgende Beschreibung bevorzugter Ausführungsformen der Erfindung dient im Zusammenhang mit der Zeichnung der näheren Erläuterung. Es zeigen:The following description of preferred embodiments of the invention serves in conjunction with the drawing for a more detailed explanation. Show it:
Figur 1 : eine schematische Seitenansicht einesFigure 1 is a schematic side view of a
Rohrschaftinstrumentes mit zangenförmig bewegbaren Werkzeugen;Tube shaft instrument with tools that can be moved in pliers;
Figur 2 : eine perspektivische Teilansicht des Rohrschaftinstrumentes der Figur 1 im Verbindungsbereich zwischen der Halterung des Werkzeuges und dem Rohrschaft undFigure 2 is a partial perspective view of the tubular shaft instrument of Figure 1 in the connection area between the holder of the tool and the tubular shaft and
Figur 3 : eine Längsschnittansicht im Verbindungs¬ bereich der Werkzeughalterung und des Rohrschaftes längs Linie 3-3 in Figur 2.FIG. 3: a longitudinal sectional view in the connection area of the tool holder and the tubular shaft along line 3-3 in FIG. 2.
Das in der Zeichnung dargestellte Rohrschaftinstrument 1 umfaßt einen rohrförmigen Schaft 2, in dessen vorderes Ende eine Halterung 3 eingesetzt ist, an der zwei backenförmige Werkzeuge 4, 5 um eine gemeinsame Achse schwenkbar gelagert sind, die somit ein Greifinstrument oder eine Zange bilden. Die Bewegung der beiden Werkzeuge 4 und 5 erfolgt durch ei¬ ne im Inneren des Schaftes 2 angeordnete Schub- und Zug¬ stange 6, die am rückwärtigen Ende aus dem Schaft 2 hervor¬ tritt und dort gelenkig mit einer Griffbranche 7 verbunden ist, die ihrerseits an einer zweiten Griffbranche 8 drehbar gelagert ist. Diese zweite Griffbranche 8 ist starr mit dem Schaft 2 verbunden, so daß beim Verschwenken der beiden Griffbranchen 7 und 8 gegeneinander die Schub- und Zugstan¬ ge 6 im Inneren des Schaftes hin- und hergeschoben wird.The tubular shaft instrument 1 shown in the drawing comprises a tubular shaft 2, in the front end of which a holder 3 is inserted, on which two jaw-shaped tools 4, 5 are pivotally mounted about a common axis, thus forming a gripping instrument or pliers. The two tools 4 and 5 are moved by a push and pull rod 6 arranged in the interior of the shaft 2, which emerges from the shaft 2 at the rear end and is articulated there to a handle branch 7, which in turn is connected rotatable on a second handle branch 8 is stored. This second grip branch 8 is rigidly connected to the shaft 2, so that when the two grip branches 7 and 8 are pivoted against each other, the push and pull rods 6 are pushed back and forth inside the shaft.
Die in den Figuren 2 und 3 näher dargestellte Halterung 3 weist einen vorderen kreiszylindrischen Abschnitt 9 mit ei¬ nem achsparallelen, nach vorne hin offenen Fach 10 auf, in welches die beiden Werkzeuge 4 und 5 eingreifen. In diesem Bereich sind die Werkzeuge 4 und 5 durch eine querverlau¬ fende Lagerwelle 11 schwenkbar gelagert. Durch eine vom rückwärtigen Ende bis in das Fach 10 reichende Durchgangs¬ öffnung 12 reicht die Schub- und Zugstange 6 bis in das Fach 10 hinein und ist dort mit in der Zeichnung nicht nä¬ her dargestellten Getriebemitteln verbunden, die eine Ver- schwenkung der Werkzeuge 4 um die Lagerwelle 11 bewirken.The holder 3 shown in more detail in FIGS. 2 and 3 has a front circular cylindrical section 9 with an axially parallel compartment 10 which is open towards the front and into which the two tools 4 and 5 engage. In this area, the tools 4 and 5 are pivotably supported by a transverse shaft 11. Through a through opening 12 extending from the rear end into the compartment 10, the push and pull rod 6 extends into the compartment 10 and is connected there to gear means, not shown in the drawing, which pivot the tools 4 effect around the bearing shaft 11.
An den vorderen Abschnitt 9 der Halterung 3 schließt sich ein mittlerer Abschnitt 13 an, der gegenüber dem vorderen Abschnitt an einer Ringstufe 14 zurückgesetzt ist und somit einen kleineren Außendurchmesser aufweist als der vordere Abschnitt. An dem der Ringstufe 14 gegenüberliegenden Ende geht dieser mittlere Abschnitt 13 über eine weitere Stufe 17 in einen hinteren Abschnitt 15 über, dessen Außendurch¬ messer noch einmal kleiner ist als der des mittleren Ab¬ schnittes 13. An die Ringstufe 17 schließt sich unmittelbar eine Ringnut 16 im Außenumfang des hinteren Abschnittes 15 an, durch die dieser hintere Abschnitt 15 im unmittelbaren Anschluß an den mittleren Abschnitt 13 weiter geschwächt ist. Diese Ringnut 16 bildet einen radialen Rücksprung in diesem Bereich. Die Ringnut 16 erstreckt sich jedoch nicht über den gesam¬ ten Außenumfang des hinteren Abschnittes 15, sondern sie wird durch Stege 18 unterbrochen, die sich als Fortsetzung des mittleren Abschnittes 13 achsparallel über die Ringnut 16 hinweg erstrecken und ihrerseits in Form einer Stufe 19 in die Mantelfläche des hinteren Abschnittes 15 übergehen. Diese Stege 18, die beispielsweise gegeneinander um 90° versetzt sein können und die sich jeweils über einen Win¬ kelbereich von beispielsweise 20° erstrecken, überbrücken damit die Ringnut 16 und verstärken die Halterung im Über¬ gangsbereich vom mittleren Abschnitt 13 in den hinteren Ab¬ schnitt 15. Die schwächende Wirkung der Ringnut 16 wird da¬ mit zumindest teilweise aufgehoben.A central section 13 adjoins the front section 9 of the holder 3, which is set back on an annular step 14 with respect to the front section and thus has a smaller outside diameter than the front section. At the end opposite the ring step 14, this middle section 13 merges via a further step 17 into a rear section 15, the outside diameter of which is once again smaller than that of the middle section 13. An annular groove is immediately connected to the ring step 17 16 in the outer circumference of the rear section 15, through which this rear section 15 is further weakened in the direct connection to the central section 13. This annular groove 16 forms a radial recess in this area. However, the annular groove 16 does not extend over the entire outer circumference of the rear section 15, but is interrupted by webs 18 which, as a continuation of the middle section 13, extend axially parallel over the annular groove 16 and in turn in the form of a step 19 into the Pass over the lateral surface of the rear section 15. These webs 18, which can be offset from one another by 90 °, for example, and each extend over an angular range of, for example, 20 °, thereby bridge the annular groove 16 and reinforce the holder in the transition region from the central section 13 into the rear section cut 15. The weakening effect of the annular groove 16 is thus at least partially eliminated.
Die gesamte Halterung 3 ist einstückig ausgebildet und be¬ steht aus einem elektrisch isolierenden Material, vorzugs¬ weise aus Keramik.The entire holder 3 is formed in one piece and consists of an electrically insulating material, preferably ceramic.
Im zusammengebauten Zustand taucht der hintere Abschnitt 15 der Halterung 3 in den rohrförmigen Schaft 2 ein und liegt an dessen Innenwand an. Der Schaft 2 trägt an seinem vorde¬ ren Ende mehrere federnde Zungen 20, die durch Längsschnit¬ te 21 voneinander getrennt sind und die nach innen hervor¬ tretende, radiale Vorsprünge 22 tragen. Die Längsschnitte 21 erweitern sich zum vorderen Ende hin stufenförmig und bilden dort nach vorne hin offene Fächer 23, in die die Stege 18 im Übergangsbereich zwischen dem mittleren Ab¬ schnitt 13 und dem hinteren Abschnitt 15 der Halterung 3 eintreten. Wenn der hintere Abschnitt 15 vollständig in den Schaft 2 eingeschoben ist, tauchen die Vorsprünge 22 in die Ringnut 16 ein, und in dieser Lage werden die Zungen 20 durch eine rohrförmige Hülse 24 fixiert, die auf dem rohr¬ förmigen Schaft 2 in axialer Richtung verschieblich gela¬ gert ist und die den rohrförmigen Schaft 2 und die mit die¬ sem im mittleren Abschnitt 13 fluchtende Halterung 3 eng anliegend umfaßt, wenn sie sich in der vorderen Position befindet (Figur 3), in der die Hülse 24 an der Ringstufe 14 anliegt. Die Hülse 24 besteht aus elektrisch isolierendem Material, so daß im Übergangsbereich der aus elektrisch isolierendem Material bestehenden Hülse einerseits und der insgesamt aus elektrisch isolierendem Material bestehenden Halterung 3 andererseits keinerlei elektrische Verbindung nach außen möglich ist. In the assembled state, the rear section 15 of the holder 3 dips into the tubular shaft 2 and lies against the inner wall thereof. At its front end, the shaft 2 carries a plurality of resilient tongues 20 which are separated from one another by longitudinal cuts 21 and which carry radial projections 22 which protrude inwards. The longitudinal cuts 21 widen step-wise towards the front end and form there open compartments 23 into which the webs 18 enter in the transition area between the middle section 13 and the rear section 15 of the holder 3. When the rear section 15 is fully inserted into the shaft 2, the projections 22 dip into the annular groove 16, and in this position the tongues 20 fixed by a tubular sleeve 24 which is displaceably mounted on the tubular shaft 2 in the axial direction and which embraces the tubular shaft 2 and the holder 3 aligned with this in the central section 13 when they are in the front position (Figure 3), in which the sleeve 24 abuts the ring step 14. The sleeve 24 consists of electrically insulating material, so that in the transition region of the sleeve consisting of electrically insulating material on the one hand and the holder 3 consisting entirely of electrically insulating material on the other hand, no electrical connection to the outside is possible.

Claims

P A T E N T A N S P R Ü C H E PATENT CLAIMS
1. Chirugisches Rohrschaftinstrument mit einem Rohr, an dessen Ende eine Halterung für ein Werkzeug lösbar gehalten ist, und mit einem in dem Rohr angeordneten und in diesem längsbewegbaren Betätigungselement zum Bewegen des Werkzeuges, mit einer elektrischen Isola¬ tion des Rohres und der Halterung, dadurch gekennzeichnet, daß die Halterung (3) insge¬ samt aus einem elektrisch isolierenden Material be¬ steht.1. Surgical tubular shaft instrument with a tube, at the end of which a holder for a tool is detachably held, and with an actuating element arranged in the tube and longitudinally movable therein for moving the tool, with an electrical insulation of the tube and the holder, thereby characterized in that the holder (3) consists overall of an electrically insulating material.
2. Rohrschaftinstrument nach Anspruch 1, dadurch gekenn¬ zeichnet, daß das elektrisch isolierende Material Kunststoff ist.2. tubular shaft instrument according to claim 1, characterized gekenn¬ characterized in that the electrically insulating material is plastic.
Rohrschaftinstrument nach Anspruch 1, dadurch gekenn¬ zeichnet, daß das elektrisch isolierende Material Ke¬ ramik ist.Tubular shaft instrument according to claim 1, characterized in that the electrically insulating material is ceramic.
Rohrschaftinstrument nach einem der Ansprüche 2 oder 3 mit einer in das Rohr (2) einschiebbareri Verlänge¬ rung (15) der Halterung (3), die radiale Rücksprünge (16) aufweist, in welche radial verschiebbare Vor¬ sprünge (22) des Rohres (2) eingreifen und die Halte¬ rung (3) dadurch axial fixieren, dadurch gekennzeichnet, daß sich die radialen Rück¬ sprünge (16) nur über einen Teil des Umfanges der Verlängerung (15) erstrecken und dazwischen parallel zur Längsachse der Verlängerung verlaufende Stege (18) stehenbleiben, die den aus dem Rohr (2) hervor¬ stehenden Teil der Halterung (3) mit ihrer Verlänge¬ rung (15) verbinden.Tubular shaft instrument according to one of claims 2 or 3 with an extension (15) of the holder (3) which can be inserted into the tube (2), the radial recesses (16), in which radially displaceable projections (22) of the tube (2) engage and thereby axially fix the holder (3), characterized in that the radial recesses (16) extend only over part of the circumference of the extension (15) and in between there remain webs (18) which run parallel to the longitudinal axis of the extension and connect the part of the holder (3) protruding from the tube (2) with their extension (15).
Rohrschaftinstrument nach Anspruch 4, dadurch gekenn¬ zeichnet, daß sich die Halterung (3) im Bereich der Rücksprünge (16) zu ihrem in das Rohr (2) eingescho¬ benen Ende hin stufenförmig verjüngt und daß sich die Stege (18) als Fortsetzung des Teils (13) der Verlän¬ gerung mit größerem Außendurchmesser in den Teil (15) mit geringerem Außendurchmesser erstrecken. Tubular shaft instrument according to claim 4, characterized gekenn¬ characterized in that the holder (3) tapers in the region of the recesses (16) towards its end pushed into the tube (2) towards the step and that the webs (18) as a continuation of the Part (13) of the extension with a larger outside diameter extend into part (15) with a smaller outside diameter.
PCT/EP1995/000998 1994-05-02 1995-03-17 Sleeved surgical instrument WO1995029640A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP4415359.7 1994-05-02
DE19944415359 DE4415359C2 (en) 1994-05-02 1994-05-02 Surgical tubular shaft instrument

Publications (1)

Publication Number Publication Date
WO1995029640A1 true WO1995029640A1 (en) 1995-11-09

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DE (1) DE4415359C2 (en)
WO (1) WO1995029640A1 (en)

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