DE10328514B3 - Endoscopic surgical scissor instrument has internal pushrod terminating at distal end in transverse cylindrical head - Google Patents

Endoscopic surgical scissor instrument has internal pushrod terminating at distal end in transverse cylindrical head

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Publication number
DE10328514B3
DE10328514B3 DE2003128514 DE10328514A DE10328514B3 DE 10328514 B3 DE10328514 B3 DE 10328514B3 DE 2003128514 DE2003128514 DE 2003128514 DE 10328514 A DE10328514 A DE 10328514A DE 10328514 B3 DE10328514 B3 DE 10328514B3
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DE
Grant status
Grant
Patent type
Prior art keywords
pushrod
tool
shaft
end
distal
Prior art date
Legal status (The legal status 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 status listed.)
Active
Application number
DE2003128514
Other languages
German (de)
Inventor
Bernhard Dipl.-Ing. Kupferschmid
Rupert Dipl.-Ing. Mayenberger
Dieter Dipl.-Ing. Weißhaupt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Aesculap AG
Original Assignee
Aesculap AG
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Filing date
Publication date
Grant date

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Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/28Surgical forceps
    • A61B17/29Forceps for use in minimally invasive surgery
    • 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
    • A61B18/1442Probes having pivoting end effectors, e.g. forceps
    • A61B18/1445Probes 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
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/28Surgical forceps
    • A61B17/29Forceps for use in minimally invasive surgery
    • A61B17/2909Handles
    • A61B2017/2912Handles transmission of forces to actuating rod or piston
    • A61B2017/2919Handles transmission of forces to actuating rod or piston details of linkages or pivot points
    • A61B2017/292Handles transmission of forces to actuating rod or piston details of linkages or pivot points connection of actuating rod to handle, e.g. ball end in recess
    • 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
    • A61B18/1442Probes having pivoting end effectors, e.g. forceps
    • A61B2018/146Scissors
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B90/00Instruments, implements or accessories specially adapted for surgery or diagnosis and not covered by any of the groups A61B1/00 - A61B50/00, e.g. for luxation treatment or for protecting wound edges
    • A61B90/03Automatic limiting or abutting means, e.g. for safety
    • A61B2090/031Automatic limiting or abutting means, e.g. for safety torque limiting
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B90/00Instruments, implements or accessories specially adapted for surgery or diagnosis and not covered by any of the groups A61B1/00 - A61B50/00, e.g. for luxation treatment or for protecting wound edges
    • A61B90/03Automatic limiting or abutting means, e.g. for safety
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B90/00Instruments, implements or accessories specially adapted for surgery or diagnosis and not covered by any of the groups A61B1/00 - A61B50/00, e.g. for luxation treatment or for protecting wound edges
    • A61B90/36Image-producing devices or illumination devices not otherwise provided for
    • A61B90/37Surgical systems with images on a monitor during operation

Abstract

A surgical scissor instrument has a bipolar grip linked via a pushrod shaft to a tool at the distal end of the shaft. The pushrod is linked to the tool by a force-limiter acting directly on the tool. The proximal end of the pushrod has a cylindrical head that is transverse to the shaft and engages with the tool.

Description

  • [0001]
    Die vorliegende Erfindung betrifft ein chirurgisches Instrument mit einem Schaft, mit einem an einem distalen Ende des Schafts angeordneten beweglichen Werkzeug, mit einem an einem proximalen Ende des Schafts angeordneten beweglichen Betätigungselement, mit einem dem Betätigungselement zugeordneten Kraftübertragungsglied zum Übertragen von Zug- und/oder Schubkräften vom Betätigungselement auf das Werkzeug und mit einer Kraftbegrenzungsvorrichtung zum Begrenzen einer vom Betätigungselement auf das Kraftübertragungsglied wirkenden Zug- und/oder Schubkraft, wobei die Kraftbegrenzungsvorrichtung ein Kraftbegrenzungselement umfaßt und wobei das Kraftbegrenzungselement direkt auf das proximale Ende des Kraftübertragungsglieds wirkt. The present invention relates to a surgical instrument having a shaft, having disposed on a distal end of the shaft movable tool, having disposed at a proximal end of the shaft movable actuating element, with an associated said actuating member force-transmitting element for transmitting tensile and / or shear forces from the actuator to the tool and with a force limiting device for limiting a force acting by the actuating element onto the force transmitting member tensile and / or thrust force, wherein the force limiting device comprises a force-limiting element, and wherein the force-limiting element acts directly on the proximal end of the force transmitting member.
  • [0002]
    Chirurgische Instrumente der eingangs beschriebenen Art finden überwiegend Anwendung in der endoskopischen Chirurgie. Surgical instruments of the aforementioned type are predominantly used in endoscopic surgery. Um das mindestens eine am Schaftende angeordnete Werkzeug durch zu große Krafteinwirkung nicht zu zerstören, ist häufig eine zwischen zwei Branchen angreifende Kraftbegrenzungsvorrichtung vorgesehen. In order not to destroy the at least one disposed on the shaft end of tools due to excessive force, a force acting limiting device between two branches is frequently provided. Mit der Kraftbegrenzungsvorrichtung ist es möglich, eine vom Betätigungselement auf das Kraftübertragungselement wirkende Zug- und/oder Schubkraft zu begrenzen. With the force limiting device, it is possible to limit a force acting by the actuating element onto the force transmitting element tension and / or thrust. Dies ist wichtig, da ein Anwender Kräfte nicht direkt auf das Werkzeug übertragen kann, wie beispielsweise bei einer Schere mit zwei relativ zueinander beweglich gelagerten Scherenblättern. This is important since a user can not directly transmitted to the tool forces, such as with a pair of scissors with two relatively movably mounted scissor blades. Der Aufbau der Kraftbegrenzungsvorrichtung und damit des gesamten Instruments sind sehr aufwendig und voluminös. The structure of the force limiting device and thus the entire instrument are very complex and voluminous.
  • [0003]
    Aus der From the DE 101 10106 A1 DE 101 10106 A1 ist eine chirurgische Zange mit einer Stellstange zum Öffnen und Schließen eines Zangenmauls bekannt, wobei das proximate Ende der Stellstange mit einem Schenkel eines zweischenkligen, verschwenkbaren Griffteils in Verbindung steht, und mindestens ein gewundenes Federelement als Überlastschutz gegen Bruch von Zangenteilen umfaßt, wobei das Federelement aus schlangenlinienartig gewundenem Flachmaterial mit in einer Ebene liegenden Windungen besteht. is a rongeur with a control rod for opening and closing a forceps jaw known, wherein the proximal end of the actuating rod is connected to one leg of a two-legged, the rotatable gripping part in connection, and at least one spiral spring element comprises as an overload protection against breakage of pliers parts, whereby the spring element consists serpentine manner spiral flat material having in-plane coils is. Ferner sind aus der Furthermore, from the US 5 451 227 A US 5,451,227 A , der , of the US 5 147 357 A US 5,147,357 A und der and the DE 94 22 450 U1 DE 94 22 450 U1 weitere chirurgische Instrumente bekannt, die eine Kraftbegrenzungsvorrichtung aufweisen. more surgical instruments are known which have a force limiting device.
  • [0004]
    Es ist daher Aufgabe der vorliegenden Erfindung, ein chirurgisches Instrument der eingangs beschriebenen Art so zu verbessern, daß es besonders einfach aufgebaut ist, daß es auf einfache Weise aus seinen Einzelteilen zusammengebaut werden kann und daß eine Lagerung des proximalen Endes des Kraftübertragungsglieds vereinfacht wird. It is therefore an object of the present invention to improve a surgical instrument of the type described at the outset so that it is particularly simple in structure that it can be assembled in a simple manner from its individual parts, and that a mounting of the proximal end of the force transmission member is simplified.
  • [0005]
    Diese Aufgabe wird bei einem chirurgischen Instrument der eingangs beschriebenen Art erfindungsgemäß dadurch gelöst, daß proximate Ende des Kraftübertragungsglieds einen zylindrischen Kopf trägt, daß eine Längsachse des Kopfes quer zur Längsachse des Schafts verläuft und daß das proximale Ende des Kraftübertragungsglieds in einer Aufnahme des Betätigungselements beweglich geführt und/oder gehalten ist und daß sich das Kraftbegrenzungselement an mindestens einem Ende der Aufnahme und am proximalen Ende des Kraftübertragungsglieds proximalseitig abstützt. This object is solved in a surgical instrument of the type described at the outset according to the invention characterized in that proximal end of the force transmission member carries a cylindrical head, so that a longitudinal axis of the head is transverse to the longitudinal axis of the shaft and that the proximal end of the force transmission member movably guided in a receptacle of the actuating element and / or is retained and that the force-limiting element is supported on the proximal end of the at least one intake and at the proximal end of the force transmitting member.
  • [0006]
    Dadurch, daß das Kraftbegrenzungselement direkt auf das proximate Ende des Kraftübertragungsglieds wirkt, kann das Instrument insgesamt sehr kompakt aufgebaut werden. Characterized in that the force limiting element acts directly on the proximal end of the force transmitting member, the instrument can be constructed very compact overall. Des weiteren läßt sich so die Zahl der erforderlichen Bauelemente des Instruments minimieren und der Zusammenbau vereinfachen. Furthermore, can thus minimize the number of required components of the instrument and simplify the assembly. Dadurch, daß das proximale Ende des Kraftübertragungsglieds in einer Auf nahme des Betätigungselements beweglich geführt und/oder gehalten ist und daß sich das Kraftbegrenzungselement an mindestens einem Ende der Aufnahme und am proximalen Ende des Kraftübertragungsglieds distalseitig und/oder proximalseitig abstützt, können sowohl Zug- als auch Schubkräfte auf einen maximalen Wert begrenzt werden. Characterized in that the proximal end of the force transmitting member acquisition in an up of is guided actuating element movably and / or maintained and that the force-limiting element is supported on at least one end of the receptacle and the power transmission member on the distal and / or proximal to the proximal end, both tensile and can also shear forces to a maximum value can be limited. Zudem läßt sich das Instrument besonders kompakt aufbauen und die Kraftbegrenzungsvorrichtung im wesentlichen in das Betätigungselement integrieren. In addition, the instrument can be particularly compact build and integrate the force limiting device substantially in the actuator. Um gleichzeitig ein Angreifen des Kraftbegrenzungselements am Kraftübertragungsglied zu optimieren und eine Lagerung des proximalen Endes des Kraftübertragungsglieds zu vereinfachen, ist es günstig, daß das proximale Ende des Kraftübertragungsglieds einen zylindrischen Kopf trägt und daß eine Längsachse des Kopfes quer zur Längsachse des Schafts verläuft. In order to simultaneously optimize an engagement of the force-limiting element on the force transmitting member and to simplify a mounting of the proximal end of the force transmitting member, it is favorable that the proximal end of the force transmitting member carries a cylindrical head and that a longitudinal axis of the head transverse to the longitudinal axis of the shaft. Der Kopf kann dann beispielsweise zentral oder seitlich auf einfache Weise in einer Nut geführt werden. The head can then, for example, are managed centrally or at the side easily in a groove.
  • [0007]
    Günstig ist es, wenn das Kraftbegrenzungselement direkt am proximalen Ende des Kraftübertragungsglieds anliegt. It is favorable when the force-limiting element rests directly on the proximal end of the force transmitting member. Auf diese Weise läßt sich die Zahl der erforderlichen Bauelemente des Instruments weiter verringern. In this way, the number of required components of the instrument can be further reduced. Darüber hinaus kann das Instrument noch kompakter aufgebaut werden. In addition, the instrument can be even more compact.
  • [0008]
    Vorzugsweise ist das Kraftbegrenzungselement in einer Grundstellung, in der vom Betätigungselement keine Kraft auf das Kraftübertragungsglied ausgeübt wird, federnd gegen das proximate Ende des Kraftübertragungsglieds vorgespannt. Preferably, the force-limiting element is resiliently biased against the proximal end of the force transmitting member in a normal position, no force is exerted on the force transmitting member in the actuating element. Dadurch ist es möglich, mit dem Betätigungselement eine Kraft auf das Kraftübertragungsglied auszuüben und das proximate Ende desselben in einer gewünschten Stellung zu halten. Thereby, it is possible to apply to the actuating element exerts a force on the force transmitting member and the proximal end thereof to maintain in a desired position. Erst wenn eine maximale Betätigungskraft überschritten wird, verformt sich das Kraftbegrenzungselement in vorher bestimmter Weise, so daß eine Bewegung des Betätigungselements nicht mehr auf das Kraftübertragungsglied übertragen wird. Only when a maximum actuating force is exceeded, the force-limiting element deforms in a predetermined manner, so that a movement of the operation member is not transmitted to the force transmitting member.
  • [0009]
    Gemäß einer bevorzugten Ausführungsform der Erfindung kann vorgesehen sein, daß das Kraftbegrenzungselement am proximalen Ende des Kraftübertragungsglieds in proximaler und/oder distaler Richtung angreift. According to a preferred embodiment of the invention it can be provided that the force-limiting element at the proximal end of the force transmission member engages in the proximal and / or distal direction. Auf diese Weise lassen sich sowohl Zug- als auch Schubkräfte auf einen maximalen Wert begrenzen. In this way, both tensile and shear forces to a maximum value can be limited. Beispielsweise könnte das Kraftbegrenzungselement hierzu einerseits fest mit dem Betätigungselement, andererseits mit dem Kraftübertragungsglied verbunden sein, so daß eine Bewegung des Betätigungselements auf das Kraftübertragungsglied hin zu einer Stauchung des Kraftbegrenzungselements, eine Bewegung des Betätigungselements vom Kraftübertragungsglied weg zu einer Dehnung des Kraftbegrenzungsglieds führt. For example, the force-limiting element might for this purpose on the one hand fixedly connected to the actuating element, its other hand to the force transmitting member, so that movement of the actuating element onto the force transmitting member towards a compression of the force limiting element, a movement of the operating member from the power transmission member leads away to an elongation of the force-limiting member.
  • [0010]
    Um eine gewünschte maximale Betätigungskraft auf einfachste Weise einzustellen, ist es vorteilhaft, wenn das Kraftbegrenzungselement elastisch ist, insbesondere federelastisch. To set a desired maximum force in the simplest manner, it is advantageous if the force-limiting element is elastic, in particular spring-elastic.
  • [0011]
    Besonders günstig ist es, wenn das Kraftbegrenzungselement eine Feder oder ein elastischer Kunststoff ist, insbesondere ein Elastomer. it when the force-limiting element is a spring or an elastic plastic, in particular an elastomer is particularly favorable. Derartige Kraftbegrenzungselemente lassen sich einfach, kostengünstig und nahezu in jeder beliebigen Form herstellen. Such a force limiting elements are easy, inexpensive and produce nearly any shape.
  • [0012]
    Besonders kompakt wird der Aufbau des Instruments, wenn das Betätigungselement das Kraftbegrenzungselement trägt. Particularly compact, the construction of the instrument, when the actuating element carries the force limiting element.
  • [0013]
    Günstig ist es, wenn das Kraftbegrenzungselement das proximate Ende des Kraftübertragungsglieds im wesentlichen umgibt und wenn das Kraftübertragungsglied in distaler Richtung aus dem Kraftbegrenzungselement herausgeführt ist. It is advantageous if the force-limiting element surrounds the proximal end of the force transmitting member substantially and when the force transmission member is led out in the distal direction from the force-limiting element. Aufgrund dieser Ausgestaltung ist selbst dann eine Begrenzung der maximalen Zug- und/oder Schubkraft möglich, wenn das Betätigungselement schwenkbar gelagert ist, und es daher nicht stets in Verlängerung der Achse des Schafts Schub- und Zugkräfte auf das Kraftübertragungsglied überträgt. Due to this configuration, a limitation of the maximum tensile and / or thrust force is possible even when the operating member is pivotally mounted, and it is therefore not always transmits in extension of the axis of the shaft pushing and pulling forces to the force transmitting member.
  • [0014]
    Eine besonders gute und allseitige Kraftübertragung auf das Kraftübertragungsglied wird erreicht, indem das proximate Ende des Kraftübertragungsglieds im Querschnitt kreisförmig ausgebildet ist. A particularly good and all-round transmission of force to the force transmitting member is achieved by the proximal end of the force transmitting member in cross section is circular. Beispielsweise kann es insgesamt kugelig, konisch oder zylindrisch ausgestaltet sein. For example, there may be a total of spherical, conical or cylindrical in shape.
  • [0015]
    Günstig ist es, wenn der Kopf mit einer in Längsrichtung des Kopfes in einer Richtung quer zur Längsachse des Schafts verlaufenden Nut auf ein durch eine Ringnut gebildetes zylindrisches Ende des Kraftübertragungsglieds aufschiebbar ist. It is advantageous if the head is pushed onto a cylindrical end formed by an annular groove of the power transmission member with a longitudinal direction of the head transverse to the longitudinal axis in one direction of the stem groove. Auf diese Weise läßt sich das distale Ende des Kraftübertragungsglieds einfacher mit einem schwenkbar gelagerten Betätigungselement verbinden. In this way, the distal end of the force transmitting member can be easily connected to a pivotally mounted actuator.
  • [0016]
    Gemäß einer bevorzugten Ausführungsform der Erfindung kann vorgesehen sein, daß die Aufnahme eine quer zur Längsachse des Schafts angeordnete, im wesentlichen zylindrische Bohrung umfaßt, welche eine im wesentlichen in distaler Richtung weisende Öffnung aufweist, die schmaler ist, als ein Durchmesser der Bohrung. According to a preferred embodiment of the invention it can be provided that the receptacle transversely to the longitudinal axis of the shaft is arranged, comprising a substantially cylindrical bore having a substantially pointing in the distal direction opening which is narrower than a diameter of the bore. Auf diese Weise kann ein zylindrischer Kopf in der Aufnahme gehalten werden, ohne daß er distalseitig aus der Aufnahme austreten kann. In this way, a cylindrical head can be held in the receptacle, without being able to emerge from the distal side of the recording. Außerdem bietet eine derartige Aufnahme die Möglichkeit, sowohl distalseitig als auch proximalseitig Stützflächen für ein Kraftbegrenzungselement auszubilden. Moreover, such a recording offers the possibility of both the distal and proximal support surfaces for a force-limiting element to be formed.
  • [0017]
    Günstig ist es, wenn die Aufnahme zwei seitliche Führungen für den Kopf aufweist, und wenn das Kraftbegrenzungselement in einer zu seiner äußeren Form korrespondierenden Ausnehmung eingesetzt ist. It is advantageous if the receptacle has two lateral guides for the head, and when the force-limiting element is inserted into a corresponding recess on its outer shape is. Das Kraftbegrenzungselement wird auf diese Weise sowohl gehalten als auch geführt. The force limiting element is either held in this way and out. Durch die seitliche Führung des Kopfes ergibt sich eine besonders große Angriffsfläche für das Kraftbegrenzungselement. The lateral guidance of the head, a particularly large contact surface for the force limiting element yields.
  • [0018]
    Vorteilhaft ist es, wenn die Aufnahme als eine mit einem in distaler Richtung weisenden Schlitz versehene Querbohrung ausgebildet ist. it when the receptacle is designed as a facing provided with a slot in the distal direction transverse bore is advantageous. In eine solche Aufnahme kann beispielsweise ein zylindrischer oder kugelförmiger Kopf eingepaßt werden, welcher von einem elastischen Kraftbegrenzungselement im wesentlichen vollständig umgeben ist. In such a recording, a cylindrical or spherical head can be fitted, for example, which is completely surrounded by an elastic force-limiting element substantially. Das proximale Ende des Kraftübertragungsglieds läßt sich somit auf einfache Weise sicher am Betätigungselement lagern. The proximal end of the force transmitting member can thus be stored easily secure the actuator.
  • [0019]
    Die nachfolgende Beschreibung bevorzugter Ausführungsformen der Erfindung dient im Zusammenhang mit der Zeichnung der näheren Erläuterung. The following description of preferred embodiments of the invention serves in conjunction with the drawings for a more detailed explanation. Es zeigen: Show it:
  • [0020]
    1 1 : eine Längsschnittansicht einer erfindungsgemäßen Schere; : A longitudinal section view of scissors according to the invention;
  • [0021]
    2 2 : eine vergrößerte Ansicht des Verbindungsbereichs zwischen dem Kraftübertragungsglied und dem Betätigungselement; An enlarged view of the connection area between the power transmission member and the actuating element;
  • [0022]
    3 3 : eine Ansicht ähnlich A view similar to 2 2 bei einem alternativen Ausführungsbeispiel; in an alternative embodiment; und and
  • [0023]
    4 4 : eine Schnittansicht längs Linie 4-4 in A sectional view taken along line 4-4 in 3 3 . ,
  • [0024]
    In In 1 1 ist eine Längsschnittansicht einer insgesamt mit dem Bezugszeichen is a longitudinal sectional view of a whole by the reference numeral 10 10 versehenen, als endoskopisches Rohrschaftinstrument ausgebildeten Bipolarschere dargestellt. provided, formed as an endoscopic instrument tubular shaft bipolar scissors shown.
  • [0025]
    Die Bipolarschere the bipolar scissors 10 10 umfaßt einen langgestreckten, rohrförmigen Schaft comprises an elongated, tubular shaft 12 12 , an dessen distalem Ende zwei relativ zueinander verschwenkbare Scherenblätter Relative to each other at its distal end two pivotable scissor blades 14 14 und and 16 16 auf einem Lagerpin on a Lagerpin 18 18 gelagert sind, welcher den Schaft are mounted, wherein the stem 12 12 beidseitig und quer zu einer Längsachse on both sides and transversely to a longitudinal axis 20 20 des Schafts the shaft 12 12 durchsetzt. interspersed. Zum Bewegen der Scherenblätter To move the scissor blades 14 14 und and 16 16 ist an einem distalen Ende einer in Richtung der Längsachse is at a distal end a in the direction of the longitudinal axis 20 20 im Schaft in the shaft 12 12 längsverschieblichen Schub- und Zugstange longitudinally displaceable push-pull rod 22 22 ein Antriebskörper a drive body 24 24 angeordnet, welcher mit zwei Führungsschlitzen arranged which is provided with two guide slots 26 26 versehen ist, in die quer zur Längsachse is provided in the transversely to the longitudinal axis 20 20 von den Scherenblättern of the scissor blades 14 14 und and 16 16 abstehende Lagerzapfen protruding bearing journals 28 28 eintauchen und in Folge einer axialen Verschiebung des Antriebskörpers dip and as a result of axial displacement of the drive body 24 24 zwangsgeführt werden, wodurch die Scherenblätter be forced out, so that the scissor blades 14 14 und and 16 16 geöffnet beziehungsweise geschlossen werden. are opened or closed.
  • [0026]
    An seinem proximalen Ende At its proximal end 30 30 ist der Schaft the shank 12 12 in einer Längsbohrung in a longitudinal bore 32 32 eines feststehenden Griffteils a stationary handle portion 34 34 aufgenommen, von dem sich eine feststehende Branche taken, from which a fixed sector 36 36 mit einer Fingeröffnung with a finger opening 38 38 im wesentlichen quer zur Längsachse substantially transverse to the longitudinal axis 20 20 von dieser weg erstreckt. extends away from this. Am Griffteil On the handle part 34 34 ist eine zweite Branche a second branch 40 40 in einer in proximaler Richtung offenen Ausnehmung in an open recess in the proximal direction 42 42 um einen quer zur Längsachse a transversely to the longitudinal axis 20 20 die Ausnehmung the recess 42 42 durchsetzenden Lagerbolzen passing through the bearing pin 44 44 schwenkbar gelagert und weist an ihrem freie Ende eine weitere Fingeröffnung pivotally mounted and has, at its free end a further finger hole 46 46 auf. on.
  • [0027]
    Ein proximales Ende der Schub- und Zugstange A proximal end of the push-pull rod 22 22 ist mit einem kurzen zylindrischen Kopf is a short cylindrical head 48 48 versehen, welcher in einer sich einstufig erweiternden Lagernut provided, which is in a single-stage expanding bearing groove 50 50 eines Lagerzylinders a storage cylinder 52 52 formschlüssig eingreift und darin gehalten ist. is positively engaged and held therein. Aus der Lagernut From the bearing groove 50 50 ragt die Schub- und Zugstange protrudes beyond the push-pull rod 22 22 hervor, die mit einer elektrischen Isolierschicht appears with an electrically insulating layer 54 54 bedeckt ist. is covered. Eine Längsachse des Lagerzylinders A longitudinal axis of the bearing cylinder 52 52 verläuft quer zur Längsachse extends transversely to the longitudinal axis 20 20 . , Der Lagerzylinder The storage cylinder 52 52 wird an der Branche is in the industry 40 40 in der Nähe des Lagerbolzens near the bearing bolt 44 44 in einer Lagerbohrung in a bearing bore 56 56 gehalten, wel che sich quer zur Längsachse held wel surface extending transversely to the longitudinal axis 20 20 erstreckt und einen sich vom Zentrum der Lagerbohrung and extending a from the center of the bearing bore 56 56 in distaler Richtung erweiternden Schlitz distally expanding slot 58 58 umfaßt. includes.
  • [0028]
    Ebenso wie die Schub- und Zugstange Like the push-pull rod 22 22 ist auch der Schaft is also the shaft 12 12 von einer elektrisch isolierenden Schicht by an electrically insulating layer 60 60 umgeben. surround. Sowohl der Schaft Both the shaft 12 12 als auch die Schub- und Zugstange and the push-pull rod 22 22 sind in nicht näher dargestellter Weise mit einem bipolaren Anschluß are in a manner not shown with a bipolar connection 62 62 verbunden, über welchen die Bipolarschere connected through which the bipolar scissors 10 10 mittels Leitungen an eine elektrische Energieversorgungseinheit angeschlossen werden kann. can be connected to an electrical power supply unit by means of lines. Sowohl über die Schub- und Zugstange Both the push and pull rod 22 22 als auch über den Schaft as well as over the shaft 12 12 wird jeweils eine elektrische Verbindung zu einem der beiden Scherenblättern is in each case an electrical connection to one of the two scissor blades 14 14 und and 16 16 hergestellt, die relativ zueinander isoliert sind. prepared which are relatively isolated. Dies ermöglicht es, zum Koagulieren von Gewebe beispielsweise einen Hochfrequenzstrom über die Scherenblätter This makes it possible to coagulate tissue, for example, a high frequency current through the scissor blades 14 14 und and 16 16 zu leiten und das koagulierte Gewebe im Anschluß an den Koagulationsvorgang zu durchtrennen. to conduct and to cut through the coagulated tissue following the coagulation process.
  • [0029]
    Des weiteren ist ein relativ zum Schaft Further, a relative to the shaft 12 12 drehfester Drehknopf non-rotatable knob 64 64 vorgesehen, welcher jedoch relativ zum Griffteil verdrehbar ist, so daß das distale Ende der Bipolarschere provided which is rotatable relative to the handle part, however, so that the distal end of the bipolar scissors 10 10 mit den beiden Scherenblättern with the two scissor blades 14 14 und and 16 16 relativ zu den beiden Branchen relative to the two branches 36 36 und and 40 40 um die Längsachse about the longitudinal axis 20 20 verdreht werden kann. can be rotated.
  • [0030]
    In In 2 2 ist ein Verbindungsbereich zwischen der Schub- und Zugstange is a connection portion between the push and pull rod 22 22 und der Branche and the industry 40 40 vergrößert dargestellt. enlarged. Der zur Längsachse The longitudinal axis 20 20 rotationssymmetrisch geformte Kopf rotationally symmetrically shaped head 48 48 ist in der Lagernut is in the mounting groove 50 50 des Lagerzylinders the bearing cylinder 52 52 formschlüssig gehalten. held positively. Der Lagerzylinder The storage cylinder 52 52 wiederum sitzt in einer zylindrischen Ausnehmung, deren Längsachse quer zur Längsachse in turn, sits in a cylindrical recess, whose longitudinal axis transverse to the longitudinal axis 20 20 des Schafts the shaft 12 12 verläuft. runs. Durch einen parallel zur Längsachse des Lagerzylinders By a parallel to the longitudinal axis of the bearing cylinder 52 52 verlaufen den Schlitz extending the slot 58 58 ist die Schub- und Zugstange is the push-pull rod 22 22 aus der Lagerbohrung from the bearing bore 56 56 herausgeführt. led out. Formschlüssig umgeben ist der Lagerzylinder surrounded Interlocking is the storage cylinder 52 52 von einem längsgeschlitzten Kunststoffzylinder of a longitudinally slit plastic cylinder 66 66 , welcher den Lagerzylinder That the bearing cylinder 52 52 spielfrei in der Lagerbohrung play in the bearing bore 56 56 hält. holds. Wird die Branche If the industry 40 40 in Richtung auf die Branche in the direction of the industry 36 36 hin verschwenkt, so wird gleichzeitig die Lagerbohrung swiveled out, so at the same time the bearing bore 56 56 in Richtung auf das distale Ende des Instruments hin bewegt. moves in the direction towards the distal end of the instrument. Übersteigt eine über die Branche Exceeds one of the industry 40 40 auf die Schub- und Zugstange to the push-pull rod 22 22 eingeleitete Kraft einen maximalen Wert, so wird der Lagerzylinder introduced force has a maximum value, the storage cylinder 52 52 proximalseitig gegen den Kunststoffzylinder proximal to the plastic cylinder 66 66 gedrückt, der sich proximalseitig an einer in distaler Richtung weisenden Wand pressed, the proximal located on a side facing in the distal direction wall 68 68 der Lagerbohrung the bearing bore 56 56 abstützt und dadurch verformt wird. supports and is deformed thereby.
  • [0031]
    Zwangsläufig wird der Kunststoffzylinder Inevitably, the plastic cylinder 66 66 gequetscht und nimmt die, den eingestellten Maximalwert übersteigende Kraft auf, wodurch eine weitere Bewegung der Schub- und Zugstange crushed and takes, the set maximum value exceeding force, whereby a further movement of the push-pull rod 22 22 in distaler Richtung verhindert wird. is prevented in the distal direction. Umgekehrt wird bei einer Verschwenkung der Branche Conversely, upon a pivotal movement of the branch 40 40 von der Branche of the industry 36 36 weg beim Übersteigen einer maximal eingeleiteten Zugkraft der Kunststoffzylinder away upon exceeding a maximum tensile force introduced the plastic cylinder 66 66 zwischen dem Lagerzylinder between the bearing cylinder 52 52 benachbart der austretenden Schub- und Zugstange adjacent the exiting push-pull rod 22 22 und distalseitigen Wandabschnitten and distal wall portions 70 70 der Lagerbohrung the bearing bore 56 56 benachbart des Schlitzes adjacent the slot 58 58 gequetscht. crushed. Dadurch wird eine Kraft, die eine voreingestellte maximale Zugkraft übersteigt, begrenzt. This will create a force exceeding a preset maximum tension force is limited. Die Schub- und Zugstange The push-pull rod 22 22 läßt sich dann nicht mehr weiter in proximaler Richtung bewegen. then can not move further in the proximal direction.
  • [0032]
    In den In the 3 3 und and 4 4 ist eine zweite Variante einer erfindungsgemäßen Kraftbegrenzung dargestellt. a second variant of a force limiting the invention.
  • [0033]
    Die Schub- und Zugstange The push-pull rod 22 22 ist wiederum mit einem zylindrischen Kopf is in turn connected to a cylindrical head 48 48 versehen, welcher in eine Lagernut eines Lagerzylinders provided that in a bearing groove of a bearing cylinder 52 52 eingreift. intervenes. Der Lagerzylinder The storage cylinder 52 52 wird in einer quaderförmigen Ausnehmung is in a cuboidal recess 72 72 der Branche the industry 40 40 benachbart dem Lagerbolzen adjacent the bearing pin 44 44 geführt. guided. Die Ausnehmung the recess 72 72 ist derart bemessen, daß ihre Breite im wesentlichen der Länge des Lagerzylinders is dimensioned so that its width is substantially the length of the bearing cylinder 72 72 entspricht und ihre Dicke im wesentlichen dem Durchmesser des Lagerzylinders corresponds and its thickness substantially equal to the diameter of the bearing cylinder 52 52 . , Distalseitig ist die Ausnehmung von einem Querschlitz The distal side of the recess a transverse slot 74 74 begrenzt, welcher proximalseitig schmaler ist, als eine Breite der Ausnehmung limited, which is proximal narrower than a width of the recess 52 52 . , Dadurch kann der Lagerzylinder This allows the storage cylinder 52 52 distalseitig nicht aus der Ausnehmung distally not out of the recess 72 72 austreten und schlägt somit beidseitig benachbart dem Querschlitz escape and thus suggests both sides adjacent the transverse slot 74 74 an Innenkanten on inner edge 76 76 der Ausnehmung the recess 72 72 an. at. In eine Sacklochbohrung In a blind hole 78 78 , welche sich proximalseitig an die Ausnehmung Which is proximal to the recess 72 72 anschließt, ist eine Schraubenfeder connects, is a coil spring 80 80 gehalten, die sich proximalseitig an einem Boden maintained, which is proximal to a bottom 82 82 der Sacklochbohrung the blind bore 78 78 abstützt, distalseitig direkt am Lagerzylinder supported, distally located on the bearing cylinder 52 52 anliegt. is applied.
  • [0034]
    Wird die Branche If the industry 40 40 gegen die Branche against the industry 36 36 verschwenkt, so stützt sich der Lagerzylinder pivoted, then the storage cylinder supports 52 52 so lange an der Schraubenfeder so long on the coil spring 80 80 ab, bis die eingeleitete Kraft die dem Lagerzylinder off until the force introduced the camp cylinder 52 52 entgegenwirkende Federkraft übersteigt. counteracting spring force exceeds. Die Feder wird zusammengedrückt, und die Schub- und Zugstange The spring is compressed, and the push-pull rod 22 22 kann dann nicht weiter in distaler Richtung bewegt werden. then can not be moved further in the distal direction.

Claims (13)

  1. Chirurgisches Instrument ( The surgical instrument ( 10 10 ) mit einem Schaft ( ) (With a shaft 12 12 ), mit einem an einem distalen Ende des Schafts ( ), (With a distal end of the shaft at a 12 12 ) angeordneten beweglichen Werkzeug ( ) Arranged movable tool ( 14 14 , . 16 16 ), mit einem an einem proximalen Ende des Schafts ( ), (Having proximal to one end of the shaft 12 12 ) angeordneten beweglichen Betätigungselement ( ) Arranged movable actuating element ( 40 40 ), mit einem dem Betätigungselement ( ), (Having a said actuating member 40 40 ) zugeordneten Kraftübertragungsglied ( ) Associated with the power transmission member ( 22 22 ) zum Übertragen von Zug- und/oder Schubkräften vom Betätigungselement ( ) (For the transmission of tensile and / or pushing forces from the actuator 40 40 ) auf das Werkzeug ( ) (On the tool 14 14 , . 16 16 ) und mit einer Kraftbegrenzungsvorrichtung zum Begrenzen einer vom Betätigungselement ( ) and with a force limiting device for limiting (by the actuator 40 40 ) auf das Kraftübertragungsglied ( ) (On the force transmitting member 22 22 ) wirkenden Zug- und/oder Schubkraft, wobei die Kraftbegrenzungsvorrichtung ein Kraftbegrenzungselement ( ) Acting tensile and / or thrust force, wherein the force limiting device comprises a force-limiting element ( 80 80 ) umfaßt und wobei das Kraftbegrenzungselement ( ), And wherein the force-limiting element ( 80 80 ) direkt auf das proximate Ende des Kraftübertragungsglieds ( ) Directly (on the proximal end of the force transmitting member 22 22 ) wirkt, dadurch gekennzeichnet , daß das proximate Ende des Kraftübertragungsglieds ( ) Acts characterized in that the proximal end of the force transmitting member ( 22 22 ) einen zylindrischen Kopf trägt (52), daß eine Längsachse des Kopfes ( ) Carries a cylindrical head (52), that a longitudinal axis of the head ( 52 52 ) quer zur Längsachse ( ) Transverse (to the longitudinal axis 20 20 ) des Schafts ( () Of the shaft 12 12 ) verläuft und daß das proximate Ende des Kraftübertragungsglieds ( ) And in that (the proximal end of the force transmitting member 22 22 ) in einer Aufnahme ( ) (In a receiving 72 72 ) des Betätigungselements ( () Of the actuator 40 40 ) beweglich geführt und/oder gehalten ist und daß sich das Kraftbegrenzungselement ( is) movably guided and / or held, and in that the force-limiting element ( 80 80 ) an mindestens einem Ende ( ) (At least one end 80 80 ) der Aufnahme ( () Of the receiving 72 72 ) und am proximalen Ende des Kraftübertragungsglieds ( ) And (at the proximal end of the force transmitting member 22 22 ) proximalseitig abstützt. supported) on the proximal side.
  2. Instrument nach Anspruch 1, dadurch gekennzeichnet, daß das Kraftbegrenzungselement ( An instrument according to claim 1, characterized in that the force-limiting element ( 80 80 ) direkt am proximalen Ende des Kraftübertragungsglieds ( ) (Directly at the proximal end of the force transmitting member 22 22 ) anliegt. ) Is present.
  3. Instrument nach einem der voranstehenden Ansprüche, dadurch gekennzeichnet, daß das Kraftbegrenzungselement ( Instrument according to any one of the preceding claims, characterized in that the force-limiting element ( 80 80 ) in einer Grundstellung, in der vom Betätigungselement ( ) In a basic position, in which (from the actuator 40 40 ) keine Kraft auf das Kraftübertragungsglied ( ) No force on the force transmitting member ( 22 22 ) ausgeübt wird, federnd gegen das proximale Ende des Kraftübertragungsglieds vorgespannt ist. ) Is applied, is resiliently biased against the proximal end of the force transmitting member.
  4. Instrument nach einem der voranstehenden Ansprüche, dadurch gekennzeichnet, daß das Kraftbegrenzungselement ( Instrument according to any one of the preceding claims, characterized in that the force-limiting element ( 80 80 ) am proximalen Ende des Kraftübertragungsglieds ( ) (At the proximal end of the force transmitting member 22 22 ) in proximaler und/oder distaler Richtung angreift. ) Engages in the proximal and / or distal direction.
  5. Instrument nach einem der voranstehenden Ansprüche, dadurch gekennzeichnet, daß das Kraftbegrenzungselement ( Instrument according to any one of the preceding claims, characterized in that the force-limiting element ( 80 80 ) elastisch ist, insbesondere federelastisch. ) Is elastic, in particular spring-elastic.
  6. Instrument nach einem der voranstehenden Ansprüche, dadurch gekennzeichnet, daß das Kraftbegrenzungselement ( Instrument according to any one of the preceding claims, characterized in that the force-limiting element ( 80 80 ) eine Feder oder ein elastischer Kunststoff ist, insbesondere ein Elastomer. ) Is a spring or an elastic plastic, in particular an elastomer.
  7. Instrument nach einem der voranstehenden Ansprüche, dadurch gekennzeichnet, daß das Betätigungselement ( Instrument according to any one of the preceding claims, characterized in that the actuating element ( 40 40 ) das Kraftbegrenzungselement ( ) The force-limiting element ( 80 80 ) trägt. ) wearing.
  8. Instrument nach einem der voranstehenden Ansprüche, dadurch gekennzeichnet, daß das Kraftbegrenzungselement ( Instrument according to any one of the preceding claims, characterized in that the force-limiting element ( 66 66 ) das proximate Ende des Kraftübertragungsglieds ( ) (The proximal end of the force transmitting member 22 22 ) im wesentlichen umgibt und daß das Kraftübertragungsglied ( ) Substantially surrounding and in that the force transmission member ( 22 22 ) in distaler Richtung aus dem Kraftbegrenzungselement ( ) (In the distal direction from the force-limiting element 66 66 ) herausgeführt ist. ) Is led out.
  9. Instrument nach einem der voranstehenden Ansprüche, dadurch gekennzeichnet, daß das proximale Ende ( Instrument according to any one of the preceding claims, characterized in that the proximal end ( 52 52 ) des Kraftübertragungsglieds ( () Of the power transmission member 22 22 ) im Querschnitt kreisförmig ausgebildet ist. ) Is circular in cross section.
  10. Instrument nach einem der voranstehenden Ansprüche, dadurch gekennzeichnet, daß der Kopf ( Instrument according to any one of the preceding claims, characterized in that the head ( 52 52 ) mit einer in Längsrichtung des Kopfes ( ) With a (in longitudinal direction of the head 52 52 ) in einer Richtung quer zur Längsachse ( ) In a direction transverse (to the longitudinal axis 20 20 ) des Schafts ( () Of the shaft 12 12 ) verlaufenden Nut ( ) Extending groove ( 50 50 ) auf ein zylindrisches Ende ( ) (On a cylindrical end 48 48 ) des Kraftübertragungsglieds ( () Of the power transmission member 22 22 ) aufschiebbar ist. ) Can be pushed.
  11. Instrument nach einem der voranstehenden Ansprüche, dadurch gekennzeichnet, daß die Aufnahme eine quer zur Längsachse ( Instrument according to any one of the preceding claims, characterized in that the receptacle has a transverse (to the longitudinal axis 20 20 ) des Schafts ( () Of the shaft 12 12 ) angeordnete, im wesentlichen zylindrische Bohrung ( ) Arranged (substantially cylindrical bore 56 56 ) umfaßt, welche eine im wesentlichen in distaler Richtung weisende Öffnung ( ) Comprising comprising (a substantially pointing in the distal direction opening 58 58 ) aufweist, die schmaler ist als ein Durchmesser der Bohrung ( ) Which is narrower than a diameter of the bore ( 56 56 ). ).
  12. Instrument nach einem der voranstehenden Ansprüche, dadurch gekennzeichnet, daß die Aufnahme ( Instrument according to any one of the preceding claims, characterized in that the receptacle ( 72 72 ) zwei seitliche Führungen für den Kopf ( ) Has two lateral guides (for the head 52 52 ) aufweist und daß das Kraftbegrenzungselement ( ) And in that the force-limiting element ( 80 80 ) in einer zu seiner äußeren Form korrespondierenden Ausnehmung ( ) (In a corresponding recess to its outer shape 78 78 ) eingesetzt ist. ) Is inserted.
  13. Instrument nach einem der voranstehenden Ansprüche, dadurch gekennzeichnet, daß die Aufnahme als eine mit einem in distaler Richtung weisenden Schlitz ( Instrument according to any one of the preceding claims, characterized in that the receiving than one (with a slot oriented in the distal direction 58 58 ) versehene Querbohrung ( ) Provided with transverse bore ( 56 56 ) ausgebildet ist. ) is trained.
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