DE102008051866B3 - Function module, for a surgical instrument, operates nipper claws and a cutting blade at the distal end of a hollow shaft - Google Patents

Abstract

The function module (100), for a surgical instrument, has a hollow shaft (102) with a manual rotating mechanism (112) at the proximal end. A nipper unit (104) is at the distal end with two claws (106,108) with relative movement operated by a rod (116) within the shaft. The proximal end of the shaft has rotation and is axially fixed in a module housing (110). A cutting blade is at the claws, with an axial sliding movement through an operating rod (126). A gearing (158,159) is in the module housing for the cutting blade trigger (114) to move a sliding sleeve (156) at a radial pin (152) in an axial slit (154) to move the cutter rod.

Description

Field of the invention

• – einen hohlen Schaft mit einem distalen und einem proximalen Ende, der eine drehfest mit ihm verbundene Rotationshandhabe trägt,
• – ein an dem distalen Ende des Schaftes festgelegtes Zangenelement mit zwei relativ zueinander klappbeweglich aneinander angelenkten Klauen,
• – eine mit dem Zangenelement gekoppelte Zangenbetätigungsstange, die im Inneren des Schaftes angeordnet ist und über dessen proximales Ende hinausragt.

The invention relates to a functional module for a surgical instrument, wherein the functional module comprises:

• A hollow shaft having a distal end and a proximal end which carries a rotation handle rotatably connected thereto,
• A clamp element fixed to the distal end of the shaft and having two claws articulated to each other in a hingedly movable manner relative to one another,
• - One with the forceps element coupled forceps actuating rod, which is arranged in the interior of the shaft and protrudes beyond the proximal end thereof.

The The invention further relates to a surgical instrument Such a functional module and a base housing.

State of the art

Functional modules and surgical instruments of the type mentioned above are known from the DE 101 25 149 B4 , This document discloses a surgical, in particular electrosurgical instrument with a base housing, with which a functional module can be coupled. The functional module has a hollow shaft which is non-rotatably connected at its proximal end, ie the end facing the user, to a rotary handle designed as a turnstile. At its distal end, ie, the end remote from the user, the shaft carries a forceps element comprising two claws, of which the first claw is fixed rigidly to the shaft and the second claw is articulated hingedly to the first claw. Inside the hollow shaft, a forceps rod is threaded, which is hinged to the movable jaw and extends proximally beyond the end of the shaft. Pull on the forceps actuating rod causes a collapse of the forceps element; conversely, axial pressure on the forceps actuating rod causes the forceps member to open.

The known module leaves on a base housing attach with the proximal end of the forceps bar in the base housing protrudes and coupled there with a mechanical transmission mechanism which is a movement of a movably attached to the base housing Pliers operating handle translated into an axial movement of the tong actuating rod. In this way, the pliers element in the assembled state of functional module and basic housing by operation of the plier handle open and closed.

there the entire functional module is that of the forceps rod rotatable axis formed.

From the EP 1 535 581 A2 Also, there is known an electrosurgical device having a shaft with a forceps member at its distal end which can be opened and closed by a forceps forceps applied to a base housing by a pull and push handle via a forceps handle. In addition, this device includes a tissue cutting function held between the jaws of the forceps element. For this purpose, a rotatably connected to the shaft, axially movable blade is provided, which can be moved in guide grooves in the inner surfaces of the jaws. The operation of the blade via a blade actuating rod, which is hollow and concentrically arranged around the forceps operating rod. Like this, the blade actuating rod also extends proximally beyond the end of the shaft into the base housing. The forceps actuator rod also extends beyond the proximal end of the blade actuating rod. Two partially nested, independently operable sliding elements, which are coupled with two independently operable, each hinged to the base housing actuating levers exert tensile or compressive forces on the actuating rods, so that the functions "gripping" and "cutting" by means of different handles on the base housing independently can be performed from each other. The rotatability of the shaft and with it the pliers element and the blade is ensured by a rotatably connected to the shaft rotation member, which in turn is rotatably mounted on the distal tip of the base housing. The rotation takes place about the axis of rotation formed by the forceps rod about which the hollow blade actuating rod is concentrically disposed.

adversely in this device, the arrangement is both of the forceps operating handle as well as the blade operating handle on the base housing. This is the base housing alone for suitable for use with a special shaft. In the known Device weighs this disadvantage so far not difficult, as they only for designed for single use. For reasons of cost, however, it is cheaper surgical equipment for one Multiple uses, and their modularity is also important Role play. In particular, it is desirable to have a uniform base housing couple with different function modules and use, too can, For example, the gripping and cutting function or just a gripping function can have.

task

It The object of the present invention is a generic functional module to extend a cutting function and thereby the coupling ability to maintain with the known base module.

It Another object of the present invention is a surgical Instrument available too provide, which has a unitary base housing, with different Function modules that either a gripping and a cutting function or only have a gripping function, can be coupled.

The solution is specified in claim 1 and 15. Follow training courses in the further claims.

Presentation of the invention

The The first task mentioned above is combined with the characteristics of the Oberbegriffs of claim 1 solved by the fact that the shaft in the area of his proximal end rotatably mounted and axially fixed in a module housing is over that the pliers push rod protrudes proximally, and that in the shaft further a cutting device is arranged rotationally fixed, comprising one in the region of the claws axially slidable blade and a blade operating rod coupled to the blade which a radial pin having a located inside the module housing Passed axial slot of the shaft, wherein in the module housing a mechanical transmission mechanism is arranged, which a movement of a movably attached to the module housing, preferably hinged blade operating handle in an axial movement a shaft encompassing and engaging the radial pin Translated sliding sleeve.

The The above second object is achieved by the features of claim 15, namely by a surgical instrument comprising a functional module according to the invention as well as a base housing, wherein the functional module is rotatably coupled to the base housing, in a mechanical transmission mechanism is arranged with the proximal. protruding beyond the module housing Area of the forceps rod can be coupled is and a movement of a hinged to the base housing pliers actuating handle translated into an axial movement of the tong actuating rod.

basic idea The present invention is the functional module with a own module housing to provide the required facial expressions of the operation of Includes cutting function and that with respect to the gripping function substantially the same Interface with the base housing forms, as the generic functional module without cutting function. A particular difficulty is this the rotational decoupling of the blade actuating mechanism. On the one hand must be including the entire shaft the pliers element and the necessary non-rotatably arranged for this Blade relative to the base housing be freely rotatable. On the other hand may move away from the base housing Blade actuating handle not rotate with it, but must be non-rotatably arranged to the base housing so that the user always keeps the blade operating handle the same Way and independent of reach the current state of rotation of the shaft.

This is achieved in that the shaft including the contained therein operating rods in the module housing is freely rotatably mounted while the module housing self-rotatably with the base housing is connectable. With regard to the forceps rod protruding proximally over the module housing, There is no change to the known functional module or the known surgical Device. The blade operating rod but does not protrude proximally the module housing out. The blade operation is thus from the base housing completely independent. To allow the necessary axial movement of the blade actuating rod is the shaft within the module housing with at least one axial slot Mistake. Through this axial slot protrudes a radial pin, the the blade operating rod fixed or in one piece is formed with this and projects perpendicularly from it. To the Radial pin protruding from the axial slot of the shaft engages sliding sleeve on, which engages around the shaft inside the module housing. The shaft is rotatable to the sliding sleeve. The sliding sleeve is rotationally fixed to the module housing. However, the sliding sleeve has an axial displaceability relative to shaft and module housing. Inside the module housing is a transmission mechanism provided a movement of a blade operating lever, which is articulated to the module housing, offset in an axial movement of the sliding sleeve. This can be, for example be done by a gear and / or gear mimic, the one firmly with the sliding sleeve connected rack and thus the sliding sleeve itself in the desired axial movement added. In this way, a rotational decoupling of the blade operation is achieved.

Of the Advantage of the present invention is that the same base housing for different Function modules with or without cutting function can be used. At the same time, a functional module with gripping and cutting function remains get the free rotatability.

conveniently, has the module housing two connected housing half shells on, each having two axially offset bearing half shells, the common two axially offset, acting as a radial bearing bearings for rotatably receiving the shaft form, of which at least one additional acts as a thrust bearing. The bearings are preferably near the proximal and the distal end of the module housing arranged so that the shaft safe and preferably without radial play is held. By training at least one camp as Radax bearings, d. H. a bearing with axial and radial force absorption, the shaft is held rotatably movable, but axially fixed. The Radaxlager may for example have a circumferential projection, which engages in a groove of the shaft. The groove can be in the shaft material itself buried, or preferably, by two spaced apart Ring Pieces which may be glued to the stem material, for example become. Preferably, one of the ring attachments is integrally connected to a turnstile, which serves as a handle for rotation of the shaft in the module housing.

preferred embodiments The invention is the subject of the dependent claims.

Basically it for the training of the invention of the function module irrelevant, in which relative position to each other the actuating rods for the Gripping or cutting function are arranged in the interior of the shaft. Preferably, however, it is provided that the forceps actuating rod at least partially in the interior of the hollow blade operating rod is arranged. This corresponds to the optimal use of space since the pliers actuating rod, which, as described above, for coupled the operation of the surgical device with the base module is the rotation axis for forms the shaft rotation.

Prefers The blade operating rod is in several parts formed, with her proximal end bearing the radial pin is formed by a receiving piston whose distal end face a centering receptacle, in which a conical connecting piece a blade operating main bar centered is stored. In this way it is possible to use the blade actuating mechanism in the area of the module housing always the same form and the blade operating main rod from a Assortment depending on shaft length select. equally it is also conceivable that the shaft and / or the forceps operating rod are formed in several parts, so that the functional module by replacing the distal ends of said elements are brought to a desired length can be. In addition, the reprocessing of the instrument is simplified after use. If indeed the conical connecting piece in its dimensions is chosen that it is compatible with existing, preferably standardized flushing systems is, he can easily coupled with appropriate hoses and as a flushing connection for rinsing of the linkage interior be used.

Advantageous is when the forceps member has a proximal guide sleeve in which a guide piston at the distal end of the blade actuating rod rotatably guided is.

Especially For example, the preferably fixed, first claw may be sleeve-like Have extension, which extends into the interior of the shaft. This sleeve can have an axial guide groove, in the a corresponding leadership advantage of the guide piston intervenes. This is the non-rotatable connection between the blade and pliers element guaranteed. Of course this rotationally fixed coupling can also be made further proximal; the Coupling in the distal area of the shaft, d. H. near the area, where blade and pincers interact in use, however, is preferred in terms of reducing the game.

at a development of this embodiment it is envisaged that the blade actuating rod in its distal Area surrounded by a compression spring, on the one hand on a fixed, outer flange the blade operating rod and on the other hand at least indirectly supported on the guide sleeve of the forceps element. hereby becomes a reset function reached the blade, the distally required abutment in Substantially formed by the guide sleeve inserted into the shaft becomes. The shaft itself can be designed as a simple tube.

Prefers has the guide sleeve of Pliers element one of flushing holes openwork wall on. This measure is for the sake of simplicity cleaning the inside of the guide sleeve.

Preferably, the proximal region of the shaft is sealed liquid-tight and gas-tight against its distal region. This can be done for example by means of a sealing ring, which is arranged on a ring seat, which in turn is releasably or firmly connected to the guide sleeve, in particular welded, glued or screwed. This ring seat can also serve as a direct abutment of the above compression spring and as a radial bearing for guiding the blade operating rod. Alternatively, it is also possible to attach the ring seat axially movable on the blade actuating rod, so that it is supported against the proximal end of the guide sleeve. Purpose of the seal is it is to prevent an increase of gases and liquids, which form in particular in the case of an electrosurgical functional module in its use.

As mentioned, the functional module is preferably an electrosurgical functional module. For this purpose, the claws are designed so that they at their each other facing claw inner sides have electrodes. In the preferred bipolar case, the claws are in the region of their articulation to each other electrically isolated against each other. To prevent a short circuit is preferably further provided that at least one claw in the area their electrode an electrically insulating spacer for Having electrode of the other claw. This can be for example be electrically insulating plastic bump, which is applied to the electrode surface is or passes through a recess in the electrode surface. To bipolar electrical contacting of the electrodes is preferably provided in that the electrode of a first of the jaws is electrically connected to the shaft and the electrode of a second of the claws electrically with the forceps actuating rod connected is. As in this embodiment, the forceps actuating rod and the shaft energized are, they are at least outside the essential part of their preferred Length electrically isolated. Thus, the forceps rod is electrically against isolating the tube surrounding the blade actuating rod. The outer isolation protects the shaft the user before the electrical contact. For isolation of the shaft against the blade operating rod located in its interior, another electrical insulation, be it on the inside of the shaft and / or be it on the outside the blade operating rod, be provided. However, it may also be sufficient if the Blade actuating rod safely centered and held at a distance from the shaft walls and the Retaining elements are electrically insulating. These may include: the mentioned above Ring seat with sealing ring at the proximal end of the guide sleeve of the forceps element, the guide piston inside the guide sleeve and the receiving piston with the radial pins at the proximal end of the Blade actuating rod.

One electrical connection with which the pliers actuating rod on the one hand and the shaft on the other hand connected to an electrical energy source are preferably arranged in the base housing. In the monopolar Fall both elements with the same electrical potential connected. However, the bipolar case in which the shaft is preferred is preferred and the forceps operating rod can be connected with different electrical potentials. The concept of electric potential is to be understood here broadly and includes both DC voltage and the preferred AC voltage applications.

Around a better way for cleaning the sake of weight to achieve preferably hollow configured claws, they have preferably at least one transverse slot passing through its outer wall on.

Further Features and advantages of the invention will become apparent from the following, special description and the drawings.

Brief description of the drawings

It demonstrate:

1 FIG. 2: a perspective view of a functional module according to the invention, separate from a base housing, FIG.

2 : a perspective view of the functional module of 1 , partially cut,

3 : A perspective view of the proximal region of the functional module of 1 partially exploded,

4 : a sectional view of the functional module of 1 in a first operating position,

5 : a sectional view of the functional module of 1 in a second operating position,

6 : a sectional view of the functional module of 1 in a third operating position.

Detailed description more preferred embodiments

1 shows a perspective view of a functional module according to the invention 100 and a fundamentally known base housing 200 that are shown separately but aligned for merge. The functional module has a shaft 102 on, at the distal end of a forceps element 104 in an internal thread of the shaft 102 is screwed. The forceps element has two claws 106 . 108 on, of which the first claw 106 rigid and the second claw 108 hinged hinged to this. Next, the function module 100 a module housing 110 on. In the module housing 110 is the shaft 102 , as explained in more detail below, rotatably mounted. From the module housing 110 a turnstile sticks out 112 out, which stuck to the shaft 102 is connected and as a handle to the rotation of the shaft 102 in the module housing 110 serves. In the area below of the module housing 110 is a lever 114 hinged, which, as described below, serves as a blade operating handle. Proximally over the module housing 110 In addition, the proximal end of a forceps rod protrudes 116 , which acts as a pull and push rod and the operation of the pliers element 104 , in particular the flaps of the second claw 108 relative to first claw 106 serves.

The base housing 200 has a firm grip 202 on, to which a second handle 206 movable, and in particular with a spring 204 biased, is arranged, which serves as a forceps handle. In 1 not recognizable is a thrust bearing in the base housing 200 that of the axial support of the proximal end of the forceps actuating rod 116 serves when the functional module 100 and the base housing 200 are coupled. This thrust bearing is with the pliers handle 206 coupled such that an actuation of the forceps actuating handle a pull on the forceps actuating rod 116 exercises. When releasing the forceps handle 206 practice the spring 204 a restoring force on the forceps handle 206 and thus on the forceps bar 116 out. Details of this type of operation of the pliers element 104 are generally known to the person skilled in the art and are not the subject of the present invention.

2 shows the function module 100 in partially cut representation. 3 shows the proximal end of the module 100 and the 4 to 6 show the distal end of the module 100 but without the shaft 102 , The following is on the 2 to 6 taken together, with different details in different figures are particularly well recognizable. The reference numbers are the same in all figures for the same elements.

As in particular in the 4 to 6 recognizable, the forceps element 104 by means of the pliers actuating rod 116 actuated. This is on the folding claw 108 so articulated that they are in an advanced position ( 4 ), the rest position of the forceps handle 206 corresponds, is open. Pull on the tong operating rod 116 , caused by a movement of the pincer handle 206 , transfers the pliers element 104 in the closed position ( 5 and 6 ). In the illustrated embodiment, the foldable claw is 108 on a rigid claw 106 hinged. This is fixed with a sleeve 118 connected, which has an external thread 120 carries that in a corresponding internal thread of the shaft 102 can be screwed. The wall of the sleeve 118 has a plurality of flushing openings 122 on, which serve the better cleaning of the sleeve interior. The analog purpose is served by transverse slots 124 in the outer coat of the claws 106 . 108 ,

The tong operating rod 116 is over the substantial portion of its length inside a hollow formed blade actuating rod 126 guided. The blade operating rod 126 discharges distally in a guide piston 128 , which is a radial guide projection 130 having, in an axial slot 132 the guide sleeve 118 is guided. The guide piston 128 has one with a recess into which the blade shaft 136 a cutting blade 138 is pluggable. For example, the blade shaft 136 be glued. This is the blade shaft 136 of the embodiment with pockets 134 provided for receiving the adhesive. Alternatively, the blade shaft can also be fixed releasably in the recess. This is particularly advantageous in terms of interchangeability of the blade. The cutting blade 138 is in central guide slots 140 the claws 106 . 108 guided.

An axial movement of the blade actuating rod 126 leads to axial movement of the blade 138 , where the 4 and 5 the fully retracted condition of the blade 138 and 6 the fully advanced condition of the blade 138 demonstrate. The task of the blade 138 is it, from the pliers element 104 to cut the retained tissue at a defined location. It is obvious that this is a rotational fixation of the blade 138 relative to the tong element 104 is required. This is not just through the guide slots 140 in the claws 106 . 108 , but in particular by the above-explained leadership of the guide piston 128 in the guide sleeve 118 reached.

In the unactuated state, the positioning of the blade 138 in the in the 4 and 5 To ensure the state of being pulled back is the blade operating rod 126 by means of a spring 142 biased. The feather 142 extends between one fixed on the blade operating rod 126 arranged flange 144 and on the guide sleeve 118 fixed ring seat 146 , The ring seat 146 carries a sealing ring 148 for sealing against the shaft 102 so that its proximal region is sealed against liquids and gases rising from the surgical site.

The axial displacement of the blade actuating rod 126 takes place completely independently of the base housing 200 via the blade operating handle 114 attached to the module housing 110 is articulated. In the area of the module housing 110 has the blade operating rod 126 a conical connecting piece 149 centered in a suitably shaped receiving flask 150 is used. The pickup piston 150 has two opposing radial pins 152 on, each one axial slot 154 of the shaft 102 push through. Proximal of the radial pins 152 The shaft is made of a sliding sleeve 156 encompassed. The sliding shell 156 is fixed with a rack 158 connected via a gear / sector gear facial expressions 159 with the blade operating lever 114 is coupled. A movement of the blade operating lever 114 thus leads to an axial displacement of the sliding sleeve 156 that over the radial pins 152 on the blade operating rod 126 is transmitted. This will cause the blade 138 in her in 6 shown advanced position. A letting go of the blade operating handle 114 due to the spring preload of the blade actuating rod explained above 126 to a return transfer of the blade 138 in her in the 4 and 5 shown, withdrawn position.

Through the previously explained interaction of sliding sleeve 156 and radial pins 152 becomes a torsional decoupling of the shaft 102 including the non-rotatably connected thereto elements, namely the pliers element 104 , the blade 138 and the respectively associated actuating linkage from the to the module housing 110 hinged blade operating handle 114 reached. The module housing 110 and with it the blade handle 114 can thus rotate with the base housing 200 be kept without the free rotation of the shaft 102 to impair. For this purpose, a molding element is preferred 111 provided on the module housing, which forms a positive connection with a corresponding element of the base housing.

In particular in 3 clearly recognizable, preferred embodiment, the free rotation of the shaft 103 through two radial bearings 160 . 162 guaranteed. These are each made up of two half bearings 160a . 160b respectively. 162a . 162b built in two housing half shells 110a . 110b are formed from which the module housing 110 is constructed. In the illustrated embodiment, the distal radial bearing 160 composed of two accurately fitting semi-annular shell elements. More complicated bearing assemblies, in particular with built-in rolling elements are conceivable in principle, but unfavorable in terms of cleaning and in view of the relatively low power consumption also superfluous. The proximal bearing 162 acts both as a radial and a thrust bearing. This is on the shaft 102 near its proximal end a first bearing ring 164 established. Distances from this is a second bearing ring 166 set, which in the preferred embodiment integral with the turnstile 112 is trained. At least one of the bearing rings 164 . 166 is made of the semi-annular cups 162a . 162b of the proximal bearing 162 accurately enclosed. In between the bearing rings 164 . 166 formed groove engages a second bearing shell of smaller diameter, which is composed of two semi-annular bearing elements, of which in 3 only one with the reference numeral 162c is recognizable. Due to this structure, the bearing acts 162 as Radaxlager.

Of course, the embodiment discussed in the specific description and shown in the figures represents only an illustrative embodiment of the present invention. A broad range of possible variations will be apparent to those skilled in the art in light of the disclosure herein. In particular, the functional module according to the invention can be designed as an electrosurgical functional module. For this purpose, the person skilled in various ways of electrical contacting known. In particular, the biopolar supply of electrical energy to electrodes at the mutually facing inner surfaces of the claws 106 . 108 can over the forceps operating rod 116 (folding claw 108 ) or over the shaft 102 and the guide sleeve electrically connected thereto 118 (rigid claw 106 ) respectively. Appropriate insulation measures to avoid short circuits can be ensured by the skilled person as needed by selecting suitable, electrically conductive and electrically non-conductive materials. As an alternative to the embodiment of the forceps element shown here 104 with a rigid and a folding claw two folding claws can be provided. The functional module according to the invention or the surgical instrument according to the invention can be used endoscopically as well as openly, depending on the specific design of the dimensions.

100

function module

102

shaft

104

pincer member

106

first claw of 104

108

second claw of 104

110

module housing

110a, 110b

Housing half shells of 110

111

Form element 110

112

turnstile

114

Blade actuating handle

116

Pliers operating rod

118

guide sleeve

120

thread

122

flushing opening

124

transverse slot

126

Blade actuating rod

128

guide piston

130

Leadership tab on 128

132

Guide slot in 118

134

Bag in 136

136

blade shaft

138

cutting blade

140

Guide slot in 106 respectively. 108

142

feather

144

Flange on 126

146

ring seat

148

seal

149

spigot

150

receiving flask

152

radial pin

154

Axial slot in 102

156

sliding sleeve

158

rack

159

Gear / ratchet facial expressions

160

distal camp

160a, 160b

Bearing shells of 160

162

proximal camp

162a, 162b

Bearing shells of 162

162c

additional bearing half shell of 162

164

first bearing ring on 102

166

second bearing ring on 102

200

base housing

202

handle

204

feather

206

Pliers operating handle

Claims (17)

Functional module for a surgical instrument, wherein the functional module ( 100 ) comprises: - a hollow shaft ( 102 ) having a distal and a proximal end, which rotatably connected to a rotary handle ( 112 ), - a at the distal end of the shaft ( 102 ) fixed pliers element ( 104 ) with two relative to each other hingedly hinged together hinged claws ( 106 . 108 ), - one with the pliers element ( 104 ) coupled forceps operating rod ( 116 ), which are inside the shaft ( 102 ) is arranged and projects beyond its proximal end, characterized in that the shaft ( 102 ) rotatably and axially fixed in the region of its proximal end in a module housing ( 110 ) is mounted, via which the forceps actuating rod ( 116 ) protrudes proximally, and that in the shaft ( 102 ) further a cutting device is arranged rotationally fixed, comprising one in the region of the claws ( 106 . 108 ) axially displaceable blade ( 138 ) and one with the blade ( 138 ) coupled blade operating rod ( 126 ), which has a radial pin ( 152 ), one in the interior of the module housing ( 110 ) located axial slot ( 154 ) of the shaft ( 102 ), wherein in the module housing ( 110 ) a mechanical transmission mechanism ( 158 . 159 ) is arranged, which is a movement of a movable on the module housing ( 110 ) mounted blade operating handle ( 114 ) in an axial movement of the shaft ( 102 ) and on the radial pin ( 152 ) engaging sliding sleeve ( 156 ) translated. Function module according to claim 1, characterized in that the module housing ( 110 ) two interconnected housing half-shells ( 110a , b), each having two axially mutually offset bearing half shells ( 160a , b; 162a , b) which together have two axially offset, as radial bearings ( 160 . 162 ) acting bearings for rotatably receiving the shaft ( 102 ), at least one of which ( 162 ) also acts as a thrust bearing. Function module according to one of the preceding claims, characterized in that the forceps actuating rod ( 116 ) at least partially inside the hollow blade operating rod ( 126 ) is arranged. Function module according to one of the preceding claims, characterized in that the blade actuating rod ( 126 ) is formed in several parts, with its proximal, the radial pin ( 152 ) carrying end of a receiving piston ( 149 ) is formed, whose distal end face has a centering receptacle in which a conical connecting piece ( 150 ) is centered on a blade operating main rod. Function module according to one of the preceding claims, characterized in that the forceps element ( 104 ) a proximal guide sleeve ( 118 ), in which a guide piston ( 128 ) at the distal end of the blade actuating rod ( 126 ) is guided rotatably. Function module according to claim 5, characterized in that the blade operating rod ( 126 ) in its distal region by a compression spring ( 142 ), which on the one hand on a fixed outer flange ( 144 ) of the blade operating rod ( 126 ) and on the other hand at least indirectly on the guide sleeve ( 118 ) of the forceps element ( 104 ) is supported. Function module according to one of claims 5 to 6, characterized in that the guide sleeve ( 118 ) of the forceps element ( 104 ) one of rinsing openings ( 122 ) has a perforated wall. Function module according to one of the preceding claims, characterized in that a proximal region of the shaft ( 104 ) against a distal portion of the shaft ( 102 ) is sealed liquid and gas tight. Function module according to one of the preceding claims, characterized in that the claws ( 106 . 108 ) have electrodes on their mutually facing claw inner sides. Function module according to claim 9, characterized in that the claws ( 106 . 108 ) are electrically isolated from each other in the region of their articulation to each other. Function module according to one of claims 9 to 10, characterized in that at least one claw ( 106 . 108 ) in the region of its electrode an electrically insulating spacer to the electrode of the other claw ( 106 . 108 ) having. Function module according to one of claims 9 to 11, characterized in that the electrode of a first claw ( 106 . 108 ) electrically with the shaft ( 102 ) and the electrode of a second claw ( 106 . 108 ) electrically with the forceps operating rod ( 116 ) connected is. Function module according to one of claims 9 to 12, characterized in that the forceps actuating rod ( 116 ) and / or the shaft ( 102 ) are electrically isolated externally over the substantial part of their length. Function module according to one of the preceding claims, characterized in that the claws ( 106 . 108 ) each have at least one transverse slot passing through its outer wall ( 124 ) exhibit. Surgical instrument comprising a functional module ( 100 ) according to one of the preceding claims and a base housing ( 200 ), whereby the functional module ( 100 ) rotatably coupled with the base housing ( 200 ), in which a mechanical transmission mechanism is arranged, with the proximal over the module housing ( 110 ) projecting portion of the forceps operating rod ( 116 ) is coupled and a movement of a movable on the base housing ( 200 ) mounted forceps handle ( 206 ) in an axial movement of the forceps actuating rod ( 116 ) translated. Surgical instrument according to claim 15, characterized in that the base housing ( 200 ) has an electrical connection, via which the forceps actuating rod ( 116 ) on the one hand and the shaft ( 102 On the other hand, are connectable to an electrical energy source. Surgical instrument according to claim 16, characterized in that the forceps actuating rod ( 116 ) and the shaft ( 102 ) are connectable to different electrical potentials.