DE202013012327U1 - Valve device for at least one suction and / or irrigation channel of a surgical instrument - Google Patents

Abstract

Valve device (10) for at least one suction and / or irrigation channel of a surgical instrument, in particular for endoscopic surgery, having a housing (20) with a cylindrical through-opening (32) which has an inner wall (33) and one in the cylindrical through-opening ( 32) arranged valve body (60) having a cylindrical outer wall (63) and in the through hole (32) is rotatably and axially displaceable, wherein a sealing action between the housing (20) and the valve body (60) by an interaction of a portion the inner wall (33) of the passage opening (32) is made with a section of the outer wall (63) of the valve body (60), wherein the housing (20) has at least one housing opening (35, 36) arranged in the inner wall (39) and the valve body (33). 60) has at least one in the cylindrical outer wall (63) arranged valve opening (65, 66, 67), wherein by movement of the valve body in the housing (20) one of the valve openings (65, 66, 67) can be brought into overlap or out of overlap with one of the housing openings (35, 36) and wherein an opening (44) is arranged in the housing (20) is, by which an on the valve body (60) arranged actuating element (70) out of the housing (20) is guided and in which the actuating element (70) is displaceably guided.

Description

The invention relates to a valve device for at least one suction and / or irrigation channel of a surgical instrument.

In order to open or close suction and / or irrigation channels in suction and / or irrigation channels of a surgical instrument for endoscopic surgery in order to supply irrigation fluid to the surgical instrument or fluids, such as gases or liquids, through the suction and / or irrigation channel To be able to aspirate, valve devices are used.

The US 5,449,357 discloses an endoscopic suction and / or irrigation instrument, in which the valve device comprises two so-called trumpet valves, which are designed as spring-loaded plunger. The plungers are arranged to close in one position a passage opening for the fluids and open in another position. These trumpet valves have the disadvantage that, on the one hand, they must be held permanently against the spring force in order to hold the trumpet valve in the desired position. On the other hand, the trumpet valves require a rubber seal to seal the valves against the housing. However, rubber seals have the disadvantage that they are subject to high wear. In addition, such a valve device on a variety of items and is therefore consuming to produce and unwieldy for the user.

The object of the invention is therefore to provide a valve device for at least one suction and / or irrigation channel of a surgical instrument, which is easy to handle and is subject to little wear.

The object is achieved by a valve device for at least one suction and / or irrigation channel of a surgical instrument having the features of patent claim 1.

Advantageous embodiments and further developments of the invention are specified in the dependent claims.

The valve device according to the invention for at least one suction and / or irrigation channel of a surgical instrument, in particular for endoscopic surgery, has a housing with a cylindrical through-opening with an inner wall and a valve body arranged in the cylindrical through-opening, which has a cylindrical outer wall and is rotatable and rotatable in the through-opening is arranged axially displaceably on, wherein a sealing action between the housing and the valve body is effected by an interaction of a portion of the inner wall of the through hole with a portion of the outer wall of the valve body, wherein the housing at least one disposed in the inner wall housing opening and the valve body at least one in having the cylindrical outer wall disposed valve opening, wherein by movement of the valve body in the housing one of the valve openings in overlap or out of overlap with one of the Ge housing openings can be brought and wherein in the housing, an opening is arranged, through which an actuating element arranged on the valve body is guided out of the housing and in which the actuating element is displaceably guided. Due to the interaction of the inner wall of the passage opening with the outer wall of the valve body, which is achieved in particular by a snug fit of the valve body in the passage opening, a seal is achieved by the surfaces, which manages without a rubber seal. Thus eliminates wear-prone rubber seals. Furthermore, the valve body is fastened in the housing only by the actuating element guided through the aperture, whereby a rotation and / or axial displacement of the valve body in the housing is achieved by movement of the actuating element in the aperture. However, the disassembly of the valve device is thus conceivably simple, since only the actuating element has to be removed from the valve body in order subsequently to be able to push the valve body out of the housing. Due to the small number of components and the cylindrical surfaces of the housing and the valve body, the valve device is easy to clean.

Particularly preferably, the clearance between the valve body and the passage opening of the housing is less than 15 .mu.m, preferably less than 10 .mu.m, more preferably less than 5 microns, whereby a particularly accurate fit of the valve body in the housing and a particularly good sealing effect can be achieved.

Advantageously, the cylindrical passage opening is arranged distally extending in the direction of proximal, so that a space-saving construction is achieved. In particular, the cylindrical passage opening is thereby arranged in extension of a shaft tube which can be arranged on the housing and, in a preferred embodiment, makes it possible to introduce additional endoscopic instruments through the passage opening and the shaft tube.

Preferably, the proximal end of the valve body is closed, for example, by a cover integrally connected to the cylindrical outer wall, in order to achieve a good seal.

According to a particularly preferred embodiment of the invention, the proximal end of the valve body is closed with a cover, which is preferably detachably connected to the valve body, wherein in the cover an insertion opening is arranged, which has a circumferential seal. The insertion opening enables the introduction of an additional endoscopic instrument in the axial direction through the cavity of the valve body into the shaft of the endoscopic instrument, which acts as a trocar sleeve, so that additional puncture sites can be avoided during surgery.

In a preferred embodiment of the invention, a first and a second housing opening are provided, wherein rinsing liquid can be introduced into the valve body through the first housing opening and fluids can be sucked through the second housing opening. This makes it possible to provide both a suction function and a rinse function in a surgical instrument.

A preferred embodiment of the invention provides that a first, a second and a third valve opening are provided, wherein the second valve opening is formed larger than the third valve opening, wherein the first valve opening in a first position of the valve body relative to the housing with the first Housing opening can be brought into overlap, wherein the second valve opening in a second position of the valve body relative to the housing with the second housing opening can be brought into overlap and wherein the third valve opening in a third position of the valve body relative to the housing with the second housing opening can be brought into overlap is. This embodiment makes it possible to provide three different functions of the surgical instrument, for example a rinsing function, a suction function with a large suction cross-section, for example for liquids, and a suction function with a smaller suction cross-section, for example for the extraction of gases or smoke.

In a preferred embodiment of the invention, the actuating element is designed as insertable or screwed into the valve body pin, which preferably has a thickening at the end facing away from the valve body. Such an actuator is simple and inexpensive to manufacture, in a simple manner to remove from the valve body and thus easy to handle.

Preferably, the aperture is formed as a slot having a plurality of arms, wherein when positioning of the actuating element in one of the arms overlaps one of the housing openings with one of the valve openings. This makes a particularly simple handling of the surgical instrument possible.

A preferred embodiment of the invention provides that one of the arms is designed such that upon positioning of the actuating element in this arm, a locking of the actuating element takes place in the arm. This avoids permanently holding the actuating element in a desired position and further simplifies the handling of the surgical instrument.

A particularly preferred embodiment of the invention provides that the valve body has a peripheral edge at the proximal end. This can serve as a stop limit for the axial movement of the valve body in the housing on the one hand. Advantageously, however, the peripheral edge protects the cylindrical outer wall of the valve body in that, in the event that the valve body falls down, the bearing edges of the valve body by the peripheral edge and the edge of the end face, which is located on the end facing away from the peripheral edge of the valve body be and thus damage the cylindrical outer wall can be avoided.

Preferably, a spring element is arranged between the valve body and the housing. This makes it possible that without actuation of the actuating element by the user, the valve body can be converted into a predetermined defined position relative to the housing.

Preferably, a tubular shaft is detachably arranged at the distal end of the housing, preferably by means of a screw connection or by means of a bayonet closure. On the one hand, this enables a flexible design of a surgical instrument, since different tube branches can be arranged on the housing, and, on the other hand, easy cleaning of the instrument.

According to a preferred embodiment of the invention, a tubular shaft with a monopolar or bipolar coagulation electrode can be detachably arranged at the distal end of the housing, preferably by means of a screw connection or by means of a bayonet closure. This provides another function of the surgical instrument, namely the ability to coagulate with the surgical instrument.

A particularly preferred embodiment of the invention provides that the coagulation electrode is designed as a hollow tube. This makes it possible that the coagulation electrode can additionally act as a suction and / or irrigation channel, so that arranged with one on the housing Tube shaft both a suction and a coagulation and rinsing are possible.

Preferably, when positioning the actuating element in one of the arms, the distal end of the coagulation electrode can be pushed out of the tubular shaft, so that a particularly simple handling of the instrument is made possible.

The invention will be explained in detail with reference to the following figures. Show it:

1a a side view of an embodiment of a valve device according to the invention,

1b a plan view of the valve device according to 1a .

1c a rear view of the valve device according to 1a .

1d a front view of the valve device according to 1a .

1e a perspective view of the valve device according to 1a .

2a a plan view of the valve device according to 1a with the actuating device in a first position,

2 B a section along the line CC in 2a .

2c a plan view of the valve device according to 2a with tubular shaft arranged thereon,

2d a section along the line AA in 2c .

3a a plan view of the valve device according to 1a with the actuating element in a second position,

3b a section along the line BB in 3a .

3c a plan view of the valve device according to 3a with tubular shaft arranged thereon,

3d a section along the line AA in 3c .

4a a plan view of the valve device according to 1a with the actuator in a third position,

4b a section along the line DD in 4a .

4c a plan view of the valve device according to 4a with tube shaft arranged thereon with coagulation electrode,

4d a section along the line AA in 4c .

5a a plan view of the valve device according to 1a with the actuator in a fourth position,

5b a section along the line AA in 5a .

5c a plan view of the valve device according to 5a with insulation piece arranged thereon,

5d a section along the line AA in 5c .

5e a plan view of the valve device according to 5c with tube shaft arranged thereon with coagulation electrode,

5f a section along the line AA in 2e .

6a a perspective view of a first housing part of the valve device according to 1a .

6b a plan view of the housing part according to 6a .

6c a section along the line AA in 6b .

7a a perspective view of a second housing part of the valve device according to 1a .

7b a rear view of the second housing part according to 7a .

7c a view of the second housing part along the arrow Y in 7b .

7d a view of the second housing part along the arrow X in 7b .

7e a section along the line AA in 7b .

7f a section along the line BB in 7e .

7g a section along the line CC in 7e .

8a an axial section through a cover of the valve device according to 1a .

8b an axial section through an alternative embodiment of the cover of the valve device,

9a a side view of the valve body of the valve device according to 1a .

9b a detailed view of the section E in 9a .

9c a section along the line AA in 9a .

9d a further side view of the valve body according to 9a .

9e a section along the line BB in 9d and

9f a section along the line CC in 9d ,

The 1 to 5 show different views of a valve device 10 with a housing 20 and a valve body 60 , 6 shows various views of a first housing part 30 of the housing 20 . 7 shows different views of a second housing part 40 of the housing 20 . 8a shows a view of a cover 50 . 8b shows a view of an alternative embodiment of the cover 50 and 9 shows different views of the valve body 60 , For clarity, not all reference numerals are given in all figures.

The first housing part 30 and the second housing part 40 form the housing 20 , The first housing part 30 (see. 6a . 6b and 6c ) is a cylindrical, tubular member having a longitudinal axis L and with a through hole 32 formed, extending from a proximal end 32a of the first housing part 30 to a distal end 32b of the first housing part 30 extends. The passage opening 32 has a cylindrical inner wall 33 on. In the inner wall 33 are a first housing opening 35 and a second housing opening 36 arranged. At the first housing opening 35 may be a first connection element 35a , For example in the form of a cylindrical neck, and at the second housing opening 36 a second connecting element 36a , For example, also in the form of a cylindrical neck, be arranged. For example, the first housing opening 35 as a flushing opening and the first connection element 35a as flushing connection and the second housing opening 36 as a suction opening and the second connection element 36a be used as suction connection. The connection elements 35a . 36a are designed such that a flushing hose or a suction hose can be attached to them, for example by plugging.

The second housing part 40 (see. 7a to 7g ) has a cylindrical portion with a longitudinal axis L and with a through hole 41 on, which in arrangement of the second housing part to the first housing part 30 the passage opening 32 continues. On the cylindrical section is a handle 49 arranged, which extends at an angle to the longitudinal axis L, for example at an angle of about 70 ° (s 7e ). The passage opening 41 of the second housing part 40 has an inner diameter in one portion, which is larger than the inner diameter in another portion of the second housing part 40 so that between the two sections a stop edge 42 is formed (cf. 7e ). In particular, the smaller diameter corresponds to the diameter of the passage opening 32 of the first housing part 30 so that the through hole 41 of the second housing part 40 infinitely in the passage opening 32 of the first housing part 30 passes.

As in particular in 7d is shown in the cylindrical portion of the second housing part 40 a breakthrough 44 arranged, which in particular the shape of a slot 45 with several arms arranged thereon, for example a first arm 46 a second arm 47 and a third arm 48 , having. The slot 45 may be partially circumferential in the cylindrical portion of the second housing part 40 be trained while the arms 46 . 47 . 48 may be arranged extending in the axial direction in the cylindrical portion. In particular, the arms run 46 . 47 . 48 substantially perpendicular to the slot 45 ,

The valve body 60 is in the 9a to 9f shown in detail and has a cylindrical section 62 with an outer wall 63 which has an outer diameter which is substantially smaller than the inner diameter of the through hole 32 so that the cylindrical section 62 of the valve body 60 exactly in the passage opening 32 can be used. The game is for example less than 15 microns, preferably less than 10 microns, ideally less than 5 microns. By interaction of the outer wall 63 and the inner wall 33 the passage opening 32 If a tight fit a seal is achieved, which does not require rubber seals. Here is the valve body 60 in the case 20 , in particular in the passage opening 32 , rotatably mounted and mounted axially displaceable.

The valve body 60 is as a cylindrical hollow body with an axial passage opening 61 educated. In the cylindrical section 62 is a first valve opening 65 , a second valve opening 66 and a third valve opening 67 arranged. The second valve opening 66 can be larger than the third valve opening 67 be educated.

The valve body 60 has a distal end 60b and a proximal end 60a on. At its proximal end 60a can the valve body 60 a circumferential edge 64 exhibit. The valve body 60 has an actuator 70 on which, for example, in a hole 68 which are in the edge 64 can be arranged, can be used. The hole 68 can be designed as a threaded hole. The actuator 70 can as a pen 72 be formed with a threaded portion which is formed in the bore formed as a threaded bore 68 is rotatable. At the pin 72 can be a thickening example in the form of a head 75 be arranged, which the grasping of the actuating element 70 facilitated.

The valve body 60 may in one embodiment at its proximal end 60a be formed closed, for example, by an integrally disposed thereon lid. In the present embodiment, the proximal end 60a of the valve body 60 a threaded approach 69 on which a cover 50 . 50 ' (please refer 8a and 8b ) can be screwed on. The cover 50 is in particular designed as a cylindrical element with a longitudinal axis L and has at the distal end a thread 52 which is on the threaded neck 69 can be screwed on. The proximal end of the cover 50 can be an insertion opening 54 have, which with a seal 56 , which is designed in particular as a rubber seal, is closed (see. 8a ). The proximal end of the cover 50 ' is formed closed, for example, the bottom of the cover 50 ' integral with the wall of the cover 50 ' is formed (see. 8b ).

At the distal end 32b of the housing 20 can a tubular shaft 90 be arranged, for example by means of a screw cap or a bayonet closure (see. 2c . 2d . 3d and 3d ). The tubular shaft 90 may for example have a length of 30 to 40 cm and, depending on the application, have different diameters. The tubular shaft 90 can for example by means of a fastener 92 on the housing 20 be screwed on. Here is the tubular shaft 90 axially opposite the fastener 92 displaceable. Between a circumferential edge at the proximal end of the tubular shaft 90 and the fastening element 5 92 is a spring element 80 arranged. In particular, the distal end of the valve body lies in this case 60 on the peripheral edge of the tubular shaft 90 on, so that upon axial movement of the valve body 60 in the distal direction of the tubular shaft 90 against the force of the spring element 80 can be pressed in the distal direction and without the action of an external force by the spring element 80 is pushed back in the proximal direction.

Instead of a tubular shaft 90 can be at the distal end 32b also a tubular shaft 95 with a monopolar and a bipolar coagulation electrode 96 be arranged, for example by means of a screw or by means of a bayonet closure (see. 4c . 4d . 5c and 5d ). The coagulation electrode 96 is preferably formed as a hollow tube. The tubular shaft 95 can for example by means of a fastener 97 on the housing 20 be screwed on. Here is the tubular shaft 90 on the fastener 97 rigidly arranged while the coagulation electrode 96 in the tube shaft 95 is arranged axially displaceable. Between a circumferential edge at the proximal end of the coagulation electrode 96 and the fastener 97 is the spring element 80 arranged. To ensure the isolation is at the distal end of the valve body 60 an isolation piece 99 arranged, which is designed as a hollow body and in which the proximal end of the coagulation electrode 96 is arranged axially displaceable.

In particular, the distal end of the valve body lies in this case 60 on the insulating piece 99 while the peripheral edge at the proximal end of the coagulation electrode 96 on the insulating piece 99 supported, so that upon axial movement of the valve body 60 in the distal direction, the coagulation electrode 96 by means of the insulating piece 99 against the force of the spring element 80 can be pressed in the distal direction and without the action of an external force by the spring element 80 is pushed back in the proximal direction.

The fastener 97 for fastening the tubular shaft 95 with the coagulation electrode 96 has a power connector 98 on, to which a cable for powering the coagulation electrode can be connected. The circuit can be closed by a switch, for example in the form of a foot pedal, to activate the coagulation function, basically independent of the position of the valve body 60 in the case 20 ,

For mounting the valve device 10 First, the two housing parts 30 . 40 to that casing 20 connected. It is also possible in principle, the housing 20 in one piece. The housing 20 has a through-going from distal to proximal through-hole, which through the two through holes 32 . 41 is formed. In this is the valve body 60 without the actuator 70 inserted from the proximal side. Slipping of the valve body 60 is by hitting the edge 64 at the stop edge 42 prevented. Subsequently, the actuating element 70 from the outside of the case 20 through the breakthrough 44 guided and in the hole 68 of the valve body 60 attached. The actuator 70 sticks out through the breakthrough 44 out of the case 20 outward. In particular, the head is 75 accessible from outside. Finally the cover 50 or 50 ' on the proximal end 60a of the valve body 60 screwed. This is the valve device 10 fully assembled. For finished assembly of the surgical instrument for endoscopy is only at the proximal end of the housing 20 the tubular shaft 90 without coagulation electrode or the shank 95 with the coagulation electrode 96 attached.

An advantageous aspect of the thus mounted instrument when using the cover 50 is that the instrument has a continuous axial lumen, which in particular by the cylindrical hollow body of the cover 50 , the passage opening 41 of the second housing part 40 and the through hole 61 of the valve body 60 as well as the case 20 arranged tubular shaft 90 or in the tube shaft 95 arranged as a hollow tube coagulation electrode 96 is formed. This continuous axial lumen makes it possible through the proximal insertion opening 54 in the cover 50 to introduce another surgical instrument through the axial lumen, so that the instrument with the valve device according to the invention 10 almost acts as a trocar sleeve. The seal 56 , which may be formed in particular circumferential, allows a seal of the further introduced instrument for covering 50 towards and allows the insertion opening 54 if it is not used, close it sufficiently. Alternatively, the proximal end of the mounted instrument through the closed cover 50 ' be completely closed.

The various possible functions of the surgical instrument can be activated as follows. By transferring the actuating element 70 in a first position, in which the actuating element 70 in the first arm 46 is pushed, the first valve opening 65 in overlap with the first housing opening 35 brought. Through the first housing opening 35 can via the connection element 35a Rinsing fluid into the interior of the valve body 60 and in one to the housing 20 connected tubular shaft 90 be introduced to activate a rinse function (see 2 ).

When transferring the actuating element 70 in a second position, in which the actuating element 70 in the second arm 47 the breakthrough 44 is arranged, the valve body 60 in the case 20 turned so that the second valve opening 66 with the second housing opening 36 overlaps (compare 3b ). The second valve opening 66 has a diameter which is comparable to the diameter of the second housing opening 36 is. In this second position, a suction with a large suction cross-section is possible, for example, to suck liquids (see 3 ).

In a third position of the actuating element 70 (S. 4 ) becomes the actuator 70 in the third arm 48 transferred while the valve body 60 such in the housing 20 turned that third valve opening 67 in overlap with the second housing opening 36 is brought (cf. 4b ). The third valve opening 67 has a smaller diameter than the second housing opening 36 on. In this position, a suction function with a small suction cross-section is made possible, for example for the extraction of smoke or other gases, in particular during a coagulation process.

To the actuator 70 can not hold permanently in the third position, the third arm 48 a fixation possibility, for example in the form of a latching feature, which may be formed by the third arm 48 angled at right angles. For transferring the actuating element 70 in the third arm is the actuator 70 moved axially. A locking function takes place by the actuating element 70 encircling the angled part of the third arm 48 is transferred, wherein the valve body 60 in the case 20 is turned. It is possible that the overlap between the third valve opening 67 and the second housing opening 36 increases, so that the suction increases.

In the coagulation function, the actuator 70 in a fourth position in the breakthrough 44 be pushed, in which none of the valve openings 65 . 66 . 67 with one of the housing openings 35 . 36 in overlap is (cf. 5 ). In principle, however, the coagulation function can be independent of the position of the valve body 60 in the case 20 to be activated. If an aspiration, for example in the form of a Rauchabsaugens should be necessary during the coagulation process, the actuator 70 be transferred to the third position to coagulate and suck off at the same time.

LIST OF REFERENCE NUMBERS

10

valve means

20

casing

30

first housing part

32

Through opening

32a

 proximal end

32b

 distal end

33

inner wall

35

first housing opening

35a

 first connection element

36

second housing opening

36a

 second connection element

40

second housing part

41

Through opening

42

stop edge

44

breakthrough

45

slot

46

first arm

47

second arm

48

third arm

49

Handle

50

cover

50 '

 cover

52

thread

54

insertion

56

poetry

60

valve body

60a

 proximal end

60b

 distal end

61

Through opening

62

 cylindrical section

63

outer wall

64

edge

65

first valve opening

66

second valve opening

67

third valve opening

68

drilling

69

threaded step

70

actuator

72

pen

75

head

80

spring element

90

tubular shaft

92

fastener

95

tubular shaft

97

fastener

98

Power connection element

99

insulation piece

L

longitudinal axis

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• US 5449357 [0003]

Claims (16)

Valve device ( 10 ) for at least one suction and / or irrigation channel of a surgical instrument, in particular for endoscopic surgery with a housing ( 20 ) with a cylindrical passage opening ( 32 ), which has an inner wall ( 33 ), and one in the cylindrical passage opening ( 32 ) arranged valve body ( 60 ), which has a cylindrical outer wall ( 63 ) and in the passage opening ( 32 ) is arranged rotatably and axially displaceable, wherein a sealing effect between the housing ( 20 ) and the valve body ( 60 ) by an interaction of a portion of the inner wall ( 33 ) of the passage opening ( 32 ) with a portion of the outer wall ( 63 ) of the valve body ( 60 ), wherein the housing ( 20 ) at least one in the inner wall ( 39 ) arranged housing opening ( 35 . 36 ) and the valve body ( 60 ) at least one in the cylindrical outer wall ( 63 ) arranged valve opening ( 65 . 66 . 67 ), wherein by movement of the valve body ( 60 ) in the housing ( 20 ) one of the valve openings ( 65 . 66 . 67 ) in overlap or out of overlap with one of the housing openings ( 35 . 36 ) and wherein in the housing ( 20 ) a breakthrough ( 44 ) is arranged, through which a on the valve body ( 60 ) arranged actuating element ( 70 ) out of the housing ( 20 ) is guided and in which the actuating element ( 70 ) is slidably guided. Surgical instrument according to claim 1, characterized in that the play between the valve body ( 60 ) and the passage opening ( 32 ) of the housing ( 20 ) is less than 15 microns, preferably less than 10 microns, more preferably less than 5 microns, is. Surgical instrument according to one of the preceding claims, characterized in that the cylindrical passage opening ( 32 ) is arranged from distal to proximal direction. Surgical instrument according to one of the preceding claims, characterized in that the proximal end ( 60a ) of the valve body ( 60 ) is closed. Surgical instrument according to one of the preceding claims, characterized in that the proximal end ( 60a ) of the valve body ( 60 ) with a cover ( 50 . 50 ' ) is closed, in which in particular an insertion opening ( 54 ) is arranged, which a circumferential seal ( 56 ) having. Surgical instrument according to one of the preceding claims, characterized in that a first ( 35 ) and a second ( 36 ) Housing opening are provided, wherein through the first housing opening ( 35 ) Rinsing liquid into the valve body ( 60 ) can be introduced and through the second housing opening ( 36 ) Fluids, such as gases or smoke, are sucked. Surgical instrument according to one of the preceding claims, characterized in that a first ( 65 ), a second ( 66 ) and a third ( 67 ) Valve opening are provided, wherein the second valve opening ( 66 ) greater than the third valve opening ( 67 ), wherein the first valve opening ( 65 ) in a first position of the valve body ( 60 ) relative to the housing ( 20 ) with the first housing opening ( 35 ) can be brought into overlap, wherein the second valve opening ( 66 ) in a second position of the valve body ( 60 ) relative to the housing ( 20 ) with the second housing opening ( 36 ) can be brought into overlap and wherein the third valve opening ( 67 ) in a third position of the valve body ( 60 ) relative to the housing ( 20 ) with the second housing opening ( 36 ) can be brought into overlap. Surgical instrument according to one of the preceding claims, characterized in that the actuating element ( 70 ) than into the valve body ( 60 ) insertable or screw-in pin ( 72 ) is formed, which preferably at the the valve body ( 60 ) facing away from having a thickening. Surgical instrument according to one of the preceding claims, characterized in that the breakthrough ( 44 ) as a slot ( 45 ) with several arms ( 46 . 47 . 48 ) is formed, wherein in positioning of the actuating element ( 70 ) in one of the arms ( 46 . 47 . 48 ) one of the housing openings ( 35 . 36 ) with one of the valve openings ( 65 . 66 . 67 ) overlaps. Surgical instrument according to one of the preceding claims, characterized in that one of the arms ( 48 ) is designed such that when positioning the actuating element ( 70 ) in this arm ( 48 ) a locking of the actuating element ( 70 ) in the arm ( 48 ) he follows. Surgical instrument according to one of the preceding claims, characterized in that the valve body ( 60 ) at the proximal end ( 60a ) a peripheral edge ( 64 ) having. Surgical instrument according to one of the preceding claims, characterized in that between the valve body ( 60 ) and the housing ( 20 ) a spring element ( 80 ) is arranged. Surgical instrument according to one of the preceding claims, characterized in that at the distal end of the housing ( 20 ) one Tubular shaft ( 90 ) is detachable, preferably by means of a screw connection or by means of a bayonet closure. Surgical instrument according to one of the preceding claims, characterized in that at the distal end of the housing ( 20 ) a tubular shaft ( 95 ) can be arranged detachably with a monopolar or bipolar coagulation electrode, preferably by means of a screw connection or by means of a bayonet closure. Surgical instrument according to claim 14, characterized in that the coagulation electrode is formed as a hollow tube. Surgical instrument according to one of the preceding claims, characterized in that when positioning the actuating element ( 70 ) in one of the arms ( 48 ) the distal end of the coagulation electrode from the tubular shaft ( 95 ) is pushed out.

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