DE4300307A1 - Chirurgisches Instrument - Google Patents
Chirurgisches InstrumentInfo
- Publication number
- DE4300307A1 DE4300307A1 DE4300307A DE4300307A DE4300307A1 DE 4300307 A1 DE4300307 A1 DE 4300307A1 DE 4300307 A DE4300307 A DE 4300307A DE 4300307 A DE4300307 A DE 4300307A DE 4300307 A1 DE4300307 A1 DE 4300307A1
- Authority
- DE
- Germany
- Prior art keywords
- shaft
- surgical instrument
- instrument according
- actuating rod
- branches
- 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.)
- Granted
Links
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
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B2017/00367—Details of actuation of instruments, e.g. relations between pushing buttons, or the like, and activation of the tool, working tip, or the like
- A61B2017/00389—Button or wheel for performing multiple functions, e.g. rotation of shaft and end effector
-
- 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
- A61B2017/2901—Details of shaft
- A61B2017/2902—Details of shaft characterized by features of the actuating rod
-
- 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
- A61B2017/2901—Details of shaft
- A61B2017/2902—Details of shaft characterized by features of the actuating rod
- A61B2017/2903—Details of shaft characterized by features of the actuating rod transferring rotary motion
-
- 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
- A61B2017/2926—Details of heads or jaws
- A61B2017/2927—Details of heads or jaws the angular position of the head being adjustable with respect to the shaft
-
- 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
- A61B2017/2926—Details of heads or jaws
- A61B2017/2932—Transmission of forces to jaw members
- A61B2017/2938—Independently actuatable jaw members, e.g. two actuating rods
-
- 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
- A61B2017/2926—Details of heads or jaws
- A61B2017/2932—Transmission of forces to jaw members
- A61B2017/2939—Details of linkages or pivot points
-
- 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
- A61B2017/2926—Details of heads or jaws
- A61B2017/2932—Transmission of forces to jaw members
- A61B2017/2939—Details of linkages or pivot points
- A61B2017/294—Connection of actuating rod to jaw, e.g. releasable
Landscapes
- Health & Medical Sciences (AREA)
- Surgery (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biomedical Technology (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Engineering & Computer Science (AREA)
- Ophthalmology & Optometry (AREA)
- Heart & Thoracic Surgery (AREA)
- Medical Informatics (AREA)
- Molecular Biology (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Surgical Instruments (AREA)
Description
Die Erfindung betrifft ein chirurgisches Instrument mit einem
Schaft, an dessen freiem Ende zwei verschwenkbare, ein zangen- oder
pinzettenförmiges Werkzeug bildende Branchen gelagert
sind, die mittels eines durch den Schaft reichenden Antriebs
zwischen einer Schließstellung und zwischen einer Offenstellung
verschwenkbar sind.
Derartige chirurgische Instrumente werden benötigt, um in Kör
perhohlräumen arbeiten zu können, in welche das chirurgische
Instrument durch enge Zugänge eingeschoben wird. Normalerweise
ist der Durchmesser der Zugänge so klein, daß auch die Instru
mente sehr geringe Außendurchmesser haben müssen, beispiels
weise können diese im Bereich zwischen 3 mm und 8 mm liegen. Es
ist dann notwendig, in dem gegebenenfalls relativ langen Schaft
komplizierte mechanische Antriebe unterzubringen, um die Werk
zeugbranchen am vorderen Ende des Schaftes in der gewünschten
Weise öffnen und schließen zu können und um gegebenenfalls zu
erreichen, daß diese Werkzeuge abwinkelbar sind.
Es ist Aufgabe der Erfindung, ein solches chirurgisches Instru
ment so auszubilden, daß mit einfachsten mechanischen Mitteln
sowohl ein gezieltes Öffnen und Schließen des Werkzeuges mög
lich ist als auch eine Anpassung der Ausrichtung des Werkzeuges
an die gewünschte Winkellage, wobei außerdem das Öffnen und
Schließen unabhängig von der jeweiligen Winkellage in gleicher
Weise erfolgen soll.
Diese Aufgabe wird bei einem chirurgischen Instrument der ein
gangs beschriebenen Art erfindungsgemäß dadurch gelöst, daß die
beiden Branchen am Schaft zusätzlich um ihre Lagerachse gemein
sam verschwenkbar sind, so daß sie ausgehend von unterschied
lichen Winkel lagen relativ zur Schaftlängsrichtung zwischen der
Schließstellung und der Offenstellung verschwenkbar sind. Es
wird also die Lagerachse, um die die beiden Branchen zum Öffnen
und Schließen verschwenkbar sind, gleichzeitig als Schwenkachse
für das gesamte Werkzeug verwendet. Dies ergibt einen besonders
platzsparenden und einfachen Aufbau.
Bei einer bevorzugten Ausführungsform ist vorgesehen, daß der
Antrieb zwei getrennte Antriebselemente umfaßt, daß jedes An
triebselement bei seiner Betätigung eine der beiden Branchen um
ihre Schwenkachse verschwenkt und daß die Antriebselemente die
beiden Branchen entweder zum Öffnen und Schließen gegensinnig
oder zum Verändern der Winkellage des Werkzeuges gleichsinnig
verschwenken. Diese Auftrennung des Antriebes der beiden
Branchen ermöglicht es somit, mit denselben Antriebselementen
sowohl die Öffnungs- und Schließbewegung der Branchen zu
steuern als auch die Verschwenkung beider Branchen, um eine an
dere Winkellage des Werkzeuges zu erreichen.
Bei der bevorzugten Ausführungsform ist vorgesehen, daß die
beiden Antriebselemente exzentrisch zur Schwenkachse an den
Branchen gelenkig angreifende Schub- und Zugstangen sind, die
im Schaft parallel zu diesem verschiebbar sind. Allein durch
die Verschiebung dieser beiden Schub- und Zugstangen lassen
sich somit entweder die Öffnungs- und die Schließbewegungen der
Branchen erzeugen oder die Veränderung der Winkellage des Werk
zeuges, je nachdem, ob die Schub- und Zugstangen gleichsinnig
oder gegensinnig verschoben werden. Man erhält auf diese Weise
eine Entkopplung der Öffnungs- und Schließbewegung von der Win
kellagenänderung allein durch unterschiedliche Verschiebe
richtungen der Schub- und Zugstangen.
Besonders günstig ist es, wenn die Schub- und Zugstangen mit
ihren den Branchen abgewandten Enden gelenkig an im Schaft pa
rallel zu dessen Längsrichtung verschiebbaren Mitnehmern gela
gert sind. Vorzugsweise erfolgt diese Lagerung so, daß die
Schub- und Zugstangen eine Parallelogrammlenkeranordnung aus
bilden.
Dabei ist vorgesehen, daß die Mitnehmer über eine im Schaft ge
lagerte Betätigungsstange wahlweise gleichsinnig oder gegen
sinnig im Schaft verschiebbar sind. Die gesamte Antriebsüber
tragung erfolgt somit über eine einzige Betätigungsstange im
Inneren des Schaftes, so daß ein geringer Platzbedarf im
Schaftbereich besteht.
Die Betätigungsstange kann im Schaft längsverschieblich gela
gert sein und verschiebt dann die Mitnehmer bei einer Längs
verschiebung der Betätigungsstange gleichsinnig.
Zusätzlich kann die Betätigungsstange im Schaft um ihre Längs
achse drehbar gelagert sein und verschiebt dann die Mitnehmer
bei einer Drehung der Betätigungsstange über ein Getriebe in
entgegengesetzten Richtungen. Eine solche Ausgestaltung ermög
licht es, über dieselbe Betätigungsstange durch Verschiebung
den Antrieb zum Öffnen und Schließen des Werkzeuges zu über
tragen, durch eine Verdrehung der Betätigungsstange dagegen die
Winkellage zu verstellen.
Bei einer bevorzugten Ausführungsform ist dabei vorgesehen, daß
die Betätigungsstange eine Gewindehülse mit einem Innengewinde
und einem gegensinnig ausgebildeten Außengewinde trägt und daß
einer der Mitnehmer auf das Außengewinde aufgeschraubt und der
andere Mitnehmer in das Innengewinde eingeschraubt ist, wobei
beide Mitnehmer gegen eine Drehung um die Hülsenlängsachse ge
sichert sind. Diese Ausgestaltung ermöglicht es, bei einer
Längsverschiebung der Betätigungsstange beide Mitnehmer gleich
sinnig mitzunehmen, während bei einer Verdrehung der Betäti
gungsstange die Mitnehmer in entgegengesetzten Richtungen ver
schoben werden, da die entsprechenden Gewinde gegensinnig aus
gebildet sind. Der Benutzer hat also die Möglichkeit, durch
Wahl der Bewegung der Betätigungsstange gezielt entweder die
Branchen des Werkzeuges zu öffnen und zu schließen oder die
Winkellage des Werkzeuges zu verändern.
Günstig ist es, wenn die Betätigungsstange ein Zahnrad mit pa
rallel zu ihrer Längsrichtung verlaufenden Zähnen trägt, wel
ches mit einem am Schaft gelagerten und von außen verdrehbaren
Zahnrad kämmt. Dadurch ist eine Drehübertragung auf die Betä
tigungsstange von außen her möglich, auch wenn die Betätigungs
stange in Längsrichtung verschiebbar ausgebildet ist.
Günstig ist es, wenn auf dem Schaft eine Hülse verdrehbar gela
gert ist, die über einen innenliegenden Zahnkranz unmittelbar
oder über ein Zwischenzahnrad das Zahnrad auf der Betätigungs
stange antreibt.
Dabei ist vorzugsweise vorgesehen, daß sich die Überdeckung des
Zahnrades auf der Betätigungsstange und des mit ihm kämmenden,
am Schaft gelagerten Zahnrades über einen Bereich erstreckt,
der größer ist als der Verschiebeweg der Betätigungsstange
längs des Schaftes. Unabhängig von der jeweiligen Lage der Be
tätigungsstange längs des Schaftes bleibt damit die Drehverbin
dung immer erhalten.
Die Betätigungsstange kann bei einem bevorzugten Ausführungs
beispiel um ihre Längsachse drehbar aber axial unverschieblich
mit einem Verbindungsstab verbunden sein, der aus dem Schaft
hervorsteht und zur Längsverschiebung der Betätigungsstange
verschiebbar ist. Dieser Verbindungsstab kann gegen Drehung ge
sichert sein, so daß sein Anschluß an weitere Betätigungsglie
der erleichtert ist.
Dabei ist es günstig, wenn der Schaft an einer Griffbranche ge
halten ist, die schwenkbar mit einer zweiten, gelenkig an der
Verbindungsstange angreifenden Griffbranche verbunden ist.
Durch öffnen und Schließen dieser Griffbranchen läßt sich die
Betätigungsstange im Schaft längsverschieblich bewegen, während
dann eine Drehbewegung der Betätigungsstange durch eine den
Schaft umgebende Griffhülse erfolgt.
Günstig ist es auch, wenn die Länge des Verbindungsstabes ein
stellbar ist, so daß dadurch beispielsweise die genaue Lage der
Branchen in Schließstellung definiert ausgewählt werden kann.
Die nachfolgende Beschreibung bevorzugter Ausführungsformen der
Erfindung dient im Zusammenhang mit der Zeichnung der näheren
Erläuterung. Es zeigen:
Fig. 1 eine Seitenansicht eines chirurgischen Instrumentes
mit einem zangenartigen Werkzeug, das in unter
schiedlichen Winkelstellungen angeordnet und ge
öffnet und geschlossen werden kann;
Fig. 2 eine vergrößerte Längsschnittansicht des dem Werk
zeug abgewandten Teils des Schaftes des in Fig. 1
dargestellten Instrumentes;
Fig. 3 eine Längsschnittansicht des werkzeugnahen Teils
des Schaftes des in Fig. 1 dargestellten Instru
mentes mit gestreckter Lage des Werkzeuges und in
Schließstellung;
Fig. 4 eine Ansicht ähnlich Fig. 3 mit dem Werkzeug in
Öffnungsstellung;
Fig. 5 eine Ansicht ähnlich Fig. 3 oder Fig. 4 mit abge
winkeltem Werkzeug und
Fig. 6 eine perspektivische Ansicht der wesentlichen An
triebsteile des zangenförmigen Werkzeuges im werk
zeugnahen Bereich des Schaftes.
Das in der Zeichnung dargestellte chirurgische Instrument um
faßt zwei um eine Schwenkachse 1 schwenkbar miteinander verbun
dene Griffbranchen 2, 3, von denen eine einen rohrförmigen
Schaft 4 trägt, während an der anderen eine im Schaft 4 längs
verschieblich geführte Betätigungsstange 5 mittels eines Kugel
kopfes 6 gelenkig gelagert ist.
Der Schaft 4 endet im Bereich der Griffbranche 2 in einem zy
lindrischen Gehäuse 7, welches aus zwei Hälften 8, 9 besteht,
die koaxial zur Schaftlängsrichtung ineinandergeschraubt sind.
Im Innern der den Griffbranchen 2, 3 benachbarten Hälfte 9 ist
eine einen Teil der Betätigungsstange 5 bildende Verbindungs
stange 10 längsverschieblich gelagert, die durch einen in der
Hälfte 9 gehaltenen und in eine Längsnut 11 der Verbindungs
stange 10 eingreifenden Stift 12 gegen Drehung gesichert ist
(Fig. 2). Die Verbindungsstange 10 ist zweiteilig ausgebildet
und weist eine Gewindespindel 13 und einen darauf aufgeschraub
ten Teil 14 auf, so daß die effektive Länge der Verbindungs
stange 10 durch verschieden tiefes Aufschrauben des Teils 14
auf die Gewindespindel 13 verändert werden kann. Die Verbin
dungsstange 10 trägt an ihrem aus der Griffbranche 2 hervorste
henden Ende den Kugelkopf 6.
Mit der Verbindungsstange 10 ist eine ebenfalls Teil der Betä
tigungsstange 5 bildende Hohlwelle 15 frei drehbar aber axial
unverschieblich verbunden; dazu taucht die Hohlwelle 15 in eine
zentrale Ausnehmung 16 der Verbindungsstange 10 ein und ist
dort durch einen in eine Umfangsnut 17 eingelegten Sprengring
18, der gleichzeitig in eine Umfangsnut 19 in der Innenwand der
Ausnehmung 16 eingreift, entsprechend fixiert.
Auf der Hohlwelle 15 ist im Innern der Hälfte 8 des Gehäuses 7
ein sich über einen größeren Längenbereich erstreckendes Ritzel
20 drehfest gehalten, dessen Zahnung parallel zur Längsrichtung
der Hohlwelle verläuft. Dieses Ritzel 20 kämmt mit einem wei
teren Ritzel 21, welches frei drehbar in der Hälfte 8 des Ge
häuses 7 gelagert ist und seinerseits mit einem Zahnkranz 22
kämmt, der an der Innenseite einer die Hälfte 8 des Gehäuses 7
umgebenden, auf dieser frei drehbar gelagerten Hülse 23 ange
ordnet ist. Diese Hülse 23 erstreckt sich in axialer Richtung
über den gesamten Verbindungsbereich zwischen den beiden Hälf
ten 8 und 9, so daß die Hülse 23 auch teilweise auf der Hälfte
9 gelagert ist. Eine Drehung der Hülse 23 führt über das Ritzel
21 und das Ritzel 20 zu einer Drehung der Hohlwelle 15 um ihre
Längsachse. Bei einer Längsverschiebung der Betätigungsstange 5
verschieben sich die Ritzel 20 und 21 axial gegeneinander, ohne
daß der Dreheingriff aufgehoben wird.
Am freien Ende des Schaftes sind um eine quer zur Längsrichtung
des Schaftes verlaufende Schwenkachse 24 zwei Branchen 25 und
26 verschwenkbar gelagert, die gemeinsam ein zangen- oder pin
zettenförmiges Werkzeug 27 bilden. An jeder Branche 25, 26
greift exzentrisch zur Schwenkachse 24 eine Schub- und Zug
stange 28 bzw. 29 an, die beide gelenkig an den Branchen 25 und
26 gelagert sind und im wesentlichen parallel zur Schaftlängs
achse verlaufend in den Schaft 4 eintauchen. Mit ihren gegen
überliegenden Enden sind beide Schub- und Zugstangen 28 und 29
gelenkig mit Mitnehmern 30, 31 verbunden, die im Schaftinneren
längsverschieblich so angeordnet sind, daß die Schub- und Zug
stangen 28 und 29 eine Parallelogrammlenkeranordnung bilden.
Der Mitnehmer 30 ist mit einer Innengewindehülse 32 fest ver
bunden, in die eine am freien Ende der Betätigungsstange 5 fest
angeordnete Gewindehülse 33 eingeschraubt ist. Diese Gewinde
hülse 33 trägt auf ihrer Außenseite dazu ein Außengewinde 34
und zusätzlich ein Innengewinde 35 entgegengesetzter Steigung.
In dieses Innengewinde 35 ist ein mit dem zweiten Mitnehmer 31
fest verbundener Gewindestift 36 eingeschraubt.
Die Innengewindehülse 32 ist gegen eine Drehung um ihre Längs
achse gesichert, und zwar durch einen im Schaft 4 gehaltenen
Stift 37, der in eine Längsnut 38 an der Außenseite der Innen
gewindehülse 32 eintaucht (Fig. 3 bis 5). In nicht näher
dargestellten Weise ist auch der Mitnehmer 31 mit seinem Gewin
destift 36 gegen eine Drehung um die Längsachse gesichert, wäh
rend beide Mitnehmer 30 und 31 in Längsrichtung frei verschieb
lich sind.
Im Betrieb ergibt sich beim Öffnen und Schließen der Griffbran
chen 2 und 3 eine Längsverschiebung der Betätigungsstange 5,
wodurch die Schub- und Zugstangen 28 und 29 in gleicher Rich
tung in Längsrichtung verschoben werden. Diese gleichsinnige
Verschiebung der Schub- und Zugstangen 28 und 29 verschwenkt
die Branchen 25 und 26 des Werkzeuges 27 gegensinnig, so daß
sich damit eine Öffnungs- oder Schließbewegung des Werkzeuges
ergibt. Durch Einstellung der Länge der Verbindungsstange 10
kann die jeweilige Schließposition der Branchen 25 und 26 mit
der jeweiligen Schließposition der Griffbranchen 2 und 3 abge
stimmt werden.
Durch Verdrehen der auf dem Gehäuse verdrehbar gelagerten Hülse
23 läßt sich die Betätigungsstange 5 um ihre Längsachse verdre
hen. Dies führt zu einer Verdrehung der Gewindehülse 33, und
aufgrund der unterschiedlichen Steigungen der Gewinde an der
Außenseite und an der Innenseite dieser Gewindehülse 33 führt
dies zu einer Verschiebung der Mitnehmer 30 und 31 in entgegen
gesetzter Richtung. Diese entgegengesetzte Verschiebung der
Mitnehmer verschwenkt über die Schub- und Zugstangen 28 und 29
die Branchen 25 und 26 gleichsinnig, es wird also dadurch die
Winkellage des Werkzeuges 27 verstellt, wobei der Öffnungs- und
Schließzustand der Branchen unverändert bleibt, wenn die Stei
gung der Gewinde an der Gewindehülse 33 abgesehen von der Rich
tung betragsmäßig gleich ist.
Damit hat der Chirurg die Möglichkeit, durch Betätigung der
Griffbranchen 2 und 3 die Öffnung der Branchen 25 und 26 des
Werkzeuges 27 zu steuern, durch Verdrehen der Hülse 23 dagegen
die Winkellage. Das Öffnen und Schließen des Werkzeuges 27 er
folgt dabei unabhängig von der jeweils eingestellten Winkel
lage, diese beiden Bewegungen sind entkoppelt, obwohl der An
trieb über dasselbe Element erfolgt, nämlich die Betätigungs
stange 5.
Der Chirurg hat zusätzlich die Möglichkeit, die beiden Hälften
8 und 9 des Gehäuses 7 gegeneinander zu verdrehen. Dies ist
ohne weiteres möglich, da auch die Betätigungsstange 5 in die
sem Bereich frei drehbar ausgebildet ist. Dadurch läßt sich das
Werkzeug 27 auch um die Längsachse des Schaftes in eine belie
bige Position bringen, das heißt der Chirurg hat die Möglich
keit, den gesamten Umgebungsbereich am Instrumentenende zu er
reichen, wobei das Werkzeug 27 zusätzlich auch die gewünschte
Winkellage einnehmen kann.
Claims (14)
1. Chirurgisches Instrument mit einem Schaft, an dessen
freiem Ende zwei verschwenkbare, ein zangen- oder pinzet
tenförmiges Werkzeug bildende Branchen gelagert sind, die
mittels eines durch den Schaft reichenden Antriebs zwi
schen einer Schließstellung und zwischen einer Offenstel
lung verschwenkbar sind,
dadurch gekennzeichnet,
daß die beiden Branchen (25, 26) am Schaft (4) zusätzlich
um Ihre Lagerachse (24) gemeinsam verschwenkbar sind, so
daß sie ausgehend von unterschiedlichen Winkel lagen rela
tiv zur Schaftlängsrichtung zwischen der Schließstellung
und der Offenstellung verschwenkbar sind.
2. Chirurgisches Instrument nach Anspruch 1, dadurch gekenn
zeichnet, daß der Antrieb zwei getrennte Antriebselemente
(28, 29) umfaßt, daß jedes Antriebselement (28, 29) bei
seiner Betätigung eine der beiden Branchen (25, 26) um
ihre Schwenkachse (24) verschwenkt und daß die Antriebs
elemente (28, 29) die beiden Branchen (25, 26) entweder
zum Öffnen und Schließen gegensinnig oder zum Verändern
der Winkellage des Werkzeuges (27) gleichsinnig ver
schwenken.
3. Chirurgisches Instrument nach Anspruch 2, dadurch gekenn
zeichnet, daß die beiden Antriebselemente (28, 29) ex
zentrisch zur Schwenkachse (24) an den Branchen (25, 26)
gelenkig angreifende Schub- und Zugstangen sind, die im
Schaft (4) parallel zu diesem verschiebbar sind.
4. Chirurgisches Instrument nach Anspruch 3, dadurch gekenn
zeichnet, daß die Schub- und Zugstangen mit ihren den
Branchen (25, 26) abgewandten Enden gelenkig an im Schaft
(4) parallel zu dessen Längsrichtung verschiebbaren Mit
nehmern (30, 31) gelagert sind.
5. Chirurgisches Instrument nach Anspruch 4, dadurch gekenn
zeichnet, daß die Mitnehmer (30, 31) über eine im Schaft
(4) gelagerte Betätigungsstange (5) wahlweise gleichsin
nig oder gegensinnig im Schaft (4) verschiebbar sind.
6. Chirurgisches Instrument nach Anspruch 5, dadurch gekenn
zeichnet, daß die Betätigungsstange (5) im Schaft (4)
längsverschieblich gelagert ist und daß die Mitnehmer
(30, 31) bei einer Längsverschiebung der Betätigungs
stange (5) gleichsinnig von dieser verschoben werden.
7. Chirurgisches Instrument nach Anspruch 6, dadurch gekenn
zeichnet, daß die Betätigungsstange (5) im Schaft (4) um
ihre Längsachse drehbar gelagert ist und daß die Mitneh
mer (30, 31) bei einer Drehung der Betätigungsstange (5)
über ein Getriebe in entgegengesetzten Richtungen ver
schoben werden.
8. Chirurgisches Instrument nach Anspruch 7, dadurch gekenn
zeichnet, daß die Betätigungsstange (5) eine Gewindehülse
(33) mit einem Innengewinde (35) und einem gegensinnig
ausgebildeten Außengewinde (34) trägt und daß einer der
Mitnehmer (30) auf das Außengewinde (34) aufgeschraubt
und der andere Mitnehmer (31) in das Innengewinde (35)
eingeschraubt ist, wobei beide Mitnehmer (30, 31) gegen
eine Drehung um die Schaftlängsachse gesichert sind.
9. Chirurgisches Instrument nach Anspruch 8, dadurch gekenn
zeichnet, daß die Betätigungsstange (5) ein Zahnrad (20)
mit parallel zu ihrer Längsrichtung verlaufenden Zähnen
trägt, welches mit einem am Schaft (4) gelagerten und von
außen verdrehbaren Zahnrad (21, 22) kämmt.
10. Chirurgisches Instrument nach Anspruch 9, dadurch gekenn
zeichnet, daß auf dem Schaft (4) eine Hülse (23) verdreh
bar gelagert ist, die über einen innenliegenden Zahnkranz
(22) unmittelbar oder über ein Zwischenzahnrad (21) das
Zahnrad (20) auf der Betätigungsstange (5) antreibt.
11. Chirurgisches Instrument nach Anspruch 9 oder 10, dadurch
gekennzeichnet, daß sich die Überdeckung des Zahnrades
(20) auf der Betätigungsstange (5) und des mit ihm käm
menden, am Schaft (4) gelagerten Zahnrades (21) über
einen Bereich erstreckt, der größer ist als der Verschie
beweg der Betätigungsstange (5) längs des Schaftes (4).
12. Chirurgisches Instrument nach einem der Ansprüche 8 bis
11, dadurch gekennzeichnet, daß die Betätigungsstange (5)
um ihre Längsachse drehbar aber axial unverschieblich mit
einer Verbindungsstange (10) verbunden ist, die aus dem
Schaft (4) hervorsteht und zur Längsverschiebung der Be
tätigungsstange (5) verschiebbar ist.
13. Chirurgisches Instrument nach Anspruch 12, dadurch ge
kennzeichnet, daß der Schaft (4) an einer Griffbranche
(2) gehalten ist, die schwenkbar mit einer zweiten, ge
lenkig an der Verbindungsstange (10) angreifenden Griff
branche (3) verbunden ist.
14. Chirurgisches Instrument nach Anspruch 12 oder 13, da
durch gekennzeichnet, daß die Länge der Verbindungsstange
(10) einstellbar ist.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4300307A DE4300307C2 (de) | 1993-01-08 | 1993-01-08 | Chirurgisches Instrument |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4300307A DE4300307C2 (de) | 1993-01-08 | 1993-01-08 | Chirurgisches Instrument |
Publications (2)
Publication Number | Publication Date |
---|---|
DE4300307A1 true DE4300307A1 (de) | 1994-07-14 |
DE4300307C2 DE4300307C2 (de) | 1996-09-19 |
Family
ID=6477872
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE4300307A Expired - Fee Related DE4300307C2 (de) | 1993-01-08 | 1993-01-08 | Chirurgisches Instrument |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE4300307C2 (de) |
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