DE102019124638A1 - Stopcock with steam openings - Google Patents

Abstract

The invention relates to a stopcock for a liquid channel of a medical endoscope, with a plug and a housing, the plug being rotatably mounted in the housing and, one behind the other in the direction of its axis of rotation, having a conical part having a conical surface and a handle part having a handle, wherein the liquid channel passes through the conical part, the conical surface and the housing, characterized in that the housing has one or more openings in a side part of its outer wall which is arranged parallel to a plane which runs through the longitudinal axis of the liquid channel and the axis of rotation of the plug and the conical surface has one or more recesses which are surrounded on all sides in the conical surface by sealing surfaces arranged in the conical surface, the sealing surfaces adjoining the housing in a sealing manner. In addition, the invention also relates to medical endoscopes which comprise one or more such shut-off cocks.

Description

The invention relates to shut-off cocks for a fluid channel of a medical endoscope of the type mentioned in the preamble of claim 1 and medical endoscopes of the type mentioned in the preamble of claim 10.

Medical endoscopes are instruments with an elongated, tubular, flexible or rigid shaft and optics that are used for the optical, minimally invasive examination of the interior of the human body and for minimally invasive interventions. Through the shaft section of the endoscope, straight-through instruments, such as stone baskets, instruments for electrosurgical resection or forceps, can be guided to the surgical site. In order to flush away local bleeding occurring during the procedure and to protect the tissue, for example, from heat damage caused by high-frequency electrosurgical application, the endoscopes are often provided with a flushing device that permanently flushes the tissue in front of the distal end of the shaft. The rinsing liquid can be passed through corresponding separate liquid channels, through the inner tube or through the cladding tube. In order to be able to control the inflow and outflow of the liquid, the liquid channels usually have a stopcock in their proximal end area. Corresponding shut-off valves are, for example, in DE 101 26 540 A1 and DE 10 2014 002 158 B4 described.

The shut-off cocks usually consist of a housing and a plug rotatable therein, the walls of which adjoin one another in a sealing manner. The large contact surface between the housing and the plug is difficult to clean and sterilize in the assembled state, since the distance between the two parts is too small for the steam to be able to safely reach during autoclaving. Therefore, until now, the plug has to be released or disengaged using a screw and removed from the housing. This opens the critical gap between the two parts so that the steam can reach the surfaces unhindered during the autoclaving. After autoclaving, however, the instrument then has to be reassembled, which increases the preparation time before the operation. Some instruments contain up to four different stopcocks, the plugs of which must first be assigned to the correct fluid channels after such dismantling and cleaning. It can therefore take some time until all the stopcocks on an endoscope are reassembled and ready for use after cleaning.

In addition, the chicks are often relatively small, so there is a risk of losing them during an autoclaving process - especially if several endoscopes are autoclaved at the same time.

There is therefore a need for shut-off cocks for endoscopes that can be cleaned more easily and without errors and that there is no risk of their chicks being lost or mixed up during subsequent assembly.

description

This object is achieved by a shut-off valve with the features of claim 1 and an endoscope with the features of claim 10. According to the invention, provision is made in particular to form recessed recesses in the conical surface of the plug, into which the autoclave steam can easily be drawn through provided in the outer wall of the tap housing Breakthroughs can penetrate. As a result, the critical surfaces - the parts of the conical surface and the inner wall of the housing that are in contact with one another - are reduced to a minimum size. At the same time, the remaining sealing surfaces and openings are arranged in such a way that the shut-off valve in its open and closed positions continues to seal the liquid channel from the exterior of the device.

In a first aspect, the invention relates to a stopcock for a liquid channel of a medical endoscope, with a plug and a housing, the plug being rotatably mounted in the housing and, one behind the other in the direction of its axis of rotation, a conical part having a conical surface and a, having a handle having a handle part, wherein the liquid channel passes through the conical part, the conical surface and the housing, characterized in that the housing in a side part of its outer wall which is arranged parallel to a plane defined by the longitudinal axis of the liquid channel and the axis of rotation of the Plug runs, has one or more openings and the conical surface has one or more recesses which are surrounded on all sides in the conical surface by sealing surfaces arranged in the conical surface, the sealing surfaces sealingly adjoining the housing.

The stopcock according to the invention is suitable for regulating the flow of liquid in a liquid channel. By turning the plug of the stopcock around its axis of rotation, the flow of liquid through the liquid channel can be reduced and completely stopped. For this purpose, the liquid channel runs through the stopcock, i.e. the stopcock has a liquid channel in its interior, the diameter of which is essentially the same as that of the relevant channel in the endoscope.

The shut-off valve has a plug and a housing (valve housing) or consists of these two elements. The chick has, one behind the other in the direction of its axis of rotation, a conical part and a handle part.

The conical part of the plug is frustoconical and is spanned by a liquid channel, the longitudinal axis of which runs transversely to the axis of rotation of the plug. The outer wall of the conical part, with the exception of its end face facing the housing, is referred to herein as the conical face. The conical surface is not flat, but has the depressions according to the invention or the elevations referred to as sealing surfaces.

The housing of the plug can be designed in one piece with a shaft section of the endoscope or it can be inserted into the endoscope as a separate part. The housing usually has a conventional cuboid shape that can accommodate the conical part of the plug in its interior. For this purpose, the housing also has an inner conical cavity which is open at least on one side for the insertion of the plug. The cavity is essentially diameter-complementary to the conical part of the plug, in particular complementary to the diameter of the plug, measured on its sealing surfaces. After the plug has been inserted into the housing, the sealing surfaces therefore adjoin the inner walls of the cavity.

The plug is rotatably mounted in the housing, i.e. it is rotatable about its axis of rotation within the cavity. The axis of rotation is usually arranged transversely to the longitudinal axis of the liquid channel. The rotation takes place by operating the handle part of the plug. For this purpose, the handle part of the chick has a handle by which the user can grip and turn the chick.

The liquid channel of the endoscope or the stopcock runs through the conical part, the conical surface and the housing. The inner diameter and the inner circumference of the liquid channel are preferably the same in all of the components mentioned. It goes without saying that the liquid channel formed by the conical part and the housing can only form a continuous channel when the shut-off valve is in the open position. In the fully closed position of the stopcock, the part of the liquid channel which runs inside the plug is arranged transversely to the longitudinal axis of the part of the liquid channel which runs inside the housing.

According to the invention, the housing has one or more openings in its outer wall transversely to the longitudinal axis of the liquid channel - i.e. transversely to the longitudinal axis of the part of the liquid channel which is arranged in the housing. A breakthrough is an opening in the outer wall which completely spans the outer wall from the outside to the inside. The breakthrough thus allows gas and liquid to pass into the interior of the housing. The opening can have any shape, for example a round (circular), oval or rectangular, for example slot-shaped, cross section. The inside diameter of the respective opening is large enough to allow a sufficient gas and liquid exchange for cleaning.

The opening or openings are arranged on the side of the housing. The opening or openings are therefore preferably not only arranged transversely to the longitudinal axis of the liquid channel but also, or alternatively, transversely to the axis of rotation of the plug in the outer wall of the housing. This means that the openings are preferably arranged in the sides of the housing which extend essentially parallel to a plane formed by the axis of rotation of the plug and the longitudinal axis of the liquid channel.

If the housing has more than one opening, these can be arranged on the same side of the housing or on different sides. At least one opening is preferably arranged on the two sides of the housing which extend parallel to the above-mentioned plane. In this way, when the endoscope is sterilized in the autoclave, steam can penetrate through the housing from both sides and sterilize the conical surface of the plug. It is also conceivable that the housing has 3, 4, 5, 6 or more openings.

The liquid channel running inside the plug is preferably aligned with openings in both sides of the housing in the closed position of the stopcock so that liquid and / or vapor from one side of the housing through an opening in a first housing side into the liquid channel inside the Chick can flow and from there can flow into an opening in a second housing side. The openings on both sides of the housing thus form an alternative steam and liquid channel together with the liquid channel inside the plug in the closed position of the shut-off valve.

The conical surface of the plug has one or more depressions. These depressions increase the otherwise usual distance between the inner wall of the housing and the conical surface, so that better cleaning and sterilization of the conical surface is made possible. The conical surface can, for example, have 1, 2, 3, 4, 5, 6 or more depressions have, conical surfaces with four depressions being preferred.

The one or more depressions in the conical surface can each adjoin an opening and / or the liquid channel, in particular in the positions in which the shut-off valve is completely open or closed. In this way it is ensured on the one hand that steam can pass through the liquid channel and steam through the openings into the depressions, while on the other hand no steam and no liquid can penetrate directly from the openings to the liquid channel or vice versa. Apart from the depressions, the interior of the endoscope is therefore still sealed off from the environment during use for a medical intervention.

It is preferred, for example, that the housing has four recesses, of which, for. B. two lie on opposite sides of the cone part and adjoin the liquid channel and the other two also lie on opposite sides of the cone part and adjoin openings arranged on the side of the housing. In other words, two depressions are arranged on opposite sides of the conical part. The two depressions which adjoin the liquid channel are penetrated by the liquid channel.

The conical part, in particular the conical surface with the sealing surfaces and depressions formed therein, is preferably configured in four-fold rotationally symmetrical fashion. In this consideration, the liquid channel running through the conical part is disregarded. Since this intersects the conical surface only twice, the conical part can only be of two-fold rotationally symmetrical design when the liquid channel is included.

The one or more depressions are essentially negative extrusions which, for example, can each have the shape of a four-sided prism (trapezoidal prism). This means that the recess has a four-sided (trapezoidal) base area, each with four-sided side walls. It is also conceivable for the edges and corners of a depression to be rounded.

The depressions in the conical surface are each surrounded on all sides by sealing surfaces arranged in the conical surface. The sealing surfaces are raised above the base of the depressions and extend in the cone plane of a conventional plug cone part. The sealing surfaces therefore adjoin the inner wall of the housing in a sealing manner, in particular in a sealing manner against a liquid passage. A sealing surface surrounds the relevant recess continuously, i.e. completely. In this way, an escape of liquid or vapor from a recess on one side of the sealing surface is completely avoided.

The sealing surfaces of the conical part can be designed as a common sealing surface which, for example, is only interrupted by recesses in the depressions. For this purpose, the conical surface can have sealing surfaces in a proximal and distal section along the axis of rotation which extend around the entire circumference of the conical part (sealing surface rings). At the same time, in a central region of the conical surface along the axis of rotation, sealing surfaces and depressions can alternate along the circumference of the conical part, i.e. in the circumferential direction.

The sealing surfaces are preferably shorter in the circumferential direction of the conical part than the depressions, i.e. they preferably have a quarter or less of the length of the depressions in the circumferential direction. The depressions can occupy a larger area on the conical surface than the sealing surface. In this way, the area of the cone part that can be reached by steam or liquid streams is maximized.

In a second aspect, the invention relates to a medical endoscope with at least one fluid channel, characterized in that it comprises at least one stopcock according to the invention, by means of which the fluid flow through the fluid channel can be regulated. In this context, 'adjustable' means that the position of the plug in the stopcock can be used to regulate whether or not liquid can flow through the stopcock. In an open position of the stopcock, liquid can flow through the stopcock, while in a closed position no liquid can flow through the stopcock. In addition, the volume of the liquid flow can preferably also be reduced by gradually closing the stopcock.

The medical endoscope is preferably a gynecological or urological endoscope. The endoscope can e.g. B. be a resectoscope, hysteroscope, ureteroscope, arthroscope or cystoscope. Alternatively, the endoscope can also be a gastroscope, colonoscope or bronchoscope. While the former are usually provided with a rigid shaft part, the latter usually comprise a flexible shaft part. The endoscope can be designed as a resectoscope.

In a typical endoscopic design, the endoscope has an elongated, tubular shaft part. The shaft part or shaft tube of the endoscope can, for. B. have a length of at least about 150 mm, e.g. B. a length between 150 mm and 400 mm. The shaft diameter can, for. B. be about 3 to 10 mm. This results in a very long and thin configuration of the shaft tube. In addition to this shaft part, the resectoscope includes a handle system for holding and operating, which usually consists of two handle parts.

The endoscope has at least one fluid channel, i.e. for example one, two, three, four or more fluid channels. A liquid channel can be formed by a flushing tube, inner tube, cladding tube or the like. So that the medical staff has a clear view of the area to be treated via the optics during the treatment, a rinsing liquid is fed through the liquid channel into the interior of the body or discharged through the liquid channel during the procedure. For example, pieces of tissue that are released during a resectoscopy can be rinsed away by this rinsing liquid. The rinsing liquid also serves to remove cloudiness, caused for example by blood, from the field of view of the optical image guide.

For the supply of liquid, a liquid channel can generally be assigned to a rinsing device or a pump in the proximal area of the endoscope, so that the rinsing liquid can initially be guided into the interior of the body at a pressure that can be predetermined. Usually the drainage of excess fluid through a fluid channel will occur spontaneously. But it is also possible to ensure the drainage by applying a slight negative pressure to the liquid channel.

In the proximal end area of the endoscope, a shut-off valve according to the invention is also arranged to regulate the flow of liquid in or on the liquid channel. This is preferably also attached in the proximal end area of the liquid channel, for example at its proximal end. For example, the shut-off valve can be kept closed when no pump or other liquid supply has yet been connected to the liquid channel. The proximal end area can be angled with respect to the main part of the liquid channel. The shut-off valve can, for example, be designed as a separate part which has connecting elements on both sides for connection to a fluid channel or an endoscope or to a fluid supply or discharge.

In addition to the fluid channel or channels, the endoscope can comprise further components, such as an optical image guide, fiber optic bundle, one or more working channels, and passage instruments, such as an electrode instrument.

Figure list

• 1 eine schematische Seitenansicht eines erfindungsgemäßen Endoskops, das einen Absperrhahn aufweist;
• 2 eine schematische Seitenansicht eines erfindungsgemäßen Absperrhahns, dessen Gehäuse einen Durchbruch aufweist;
• 3 eine schematische Seitenansicht eines erfindungsgemäßen Kükens, das in seinem Konusteil einen Flüssigkeitskanal und vier Vertiefungen aufweist;
• 4 eine gegenüber 3 um 90° um die Drehachse des Kükens gedrehte schematische Seitenansicht des erfindungsgemäßen Kükens aus 3;
• 5 eine schematische Schnittdarstellung des Konusteils und Gehäuses des erfindungsgemäßen Absperrhahns, wobei der Absperrhahn in einer vollständig geöffneten Stellung ist; und
• 6 eine schematische Schnittdarstellung des Konusteils und Gehäuses des erfindungsgemäßen Absperrhahns, wobei der Absperrhahn in einer vollständig geschlossenen Stellung ist.

Exemplary embodiments of the invention are shown schematically in the drawings. Show it:

• 1 a schematic side view of an endoscope according to the invention, which has a stopcock;
• 2 a schematic side view of a stopcock according to the invention, the housing of which has an opening;
• 3 a schematic side view of a plug according to the invention, which has a liquid channel and four wells in its conical part;
• 4th one opposite 3 Schematic side view of the plug according to the invention rotated by 90 ° about the axis of rotation of the plug 3 ;
• 5 a schematic sectional view of the cone part and housing of the stopcock according to the invention, wherein the stopcock is in a fully open position; and
• 6th a schematic sectional view of the cone part and housing of the stopcock according to the invention, wherein the stopcock is in a completely closed position.

Embodiments

Further advantages, characteristics and features of the present invention will become clear in the following detailed description of exemplary embodiments with reference to the accompanying drawings. However, the invention is not restricted to these exemplary embodiments.

1 shows a schematic side view of an endoscope according to the invention 12th with one inside the shaft part 13th running fluid channel, not visible here 11 going through a main body 44 angled to an inlet port 36 leads. At the inlet port 36 is to regulate the flow of liquid through the liquid channel 11 a stopcock 10 arranged. At the inlet connection 36 can, for example, be a pump for supplying liquid into the liquid channel 11 be connected.

The side view shown here shows the medical endoscope 12th in the orientation in which it is usually used during surgery. The endoscope 12th has an eyepiece at its proximal end 38 to observe the operating area. So that the surgeon uses the endoscope 12th can hold safely during the operation are two handles 40 , 42 on the endoscope 12th attached. The Grips 40 , 42 are ergonomically shaped in the usual way so that the surgeon can use the endoscope 12th with the help of the handles 40 , 42 can hold in one hand. The surgeon has the other hand free, for example, to insert straight-through instruments into a working channel of the instrument and to operate them.

2 shows a schematic side view of a stopcock according to the invention 10 who made a housing 16 and a chick 14th includes that with its conical part, which is not visible here 22nd in the case 16 is recorded. The case 16 is roughly cuboid and in one piece with the tubular inlet connection 36 educated. Alternatively, it is also conceivable on both sides of the housing 16 , as in 5 and 6th shown connecting parts 50 provide, by means of which a connection with an inlet nozzle 36 can be produced. The case 16 points to picking up the chick 14th has a larger circumference and diameter than the rest of the inlet port 36 .

As in 2 to see the chick instructs 14th a handle part 26th on that one handle 24 includes, on which the user to rotate the chick 14th can touch. The handle 24 can be ergonomically shaped for this purpose in order to make it easier for the user to hold and move.

The case 16 the stopcock 10 shows a breakthrough on the side 28 on. The breakthrough 28 is on one side of the stopcock 10 arranged, which is substantially parallel to a plane extending from the longitudinal axis of the inlet port 36 and the axis of rotation 18th of the chick is formed. The breakthrough 28 has a circular cross-section and spans the outer wall 30th of the housing 16 . This creates the breakthrough 28 an opening in the outer wall 30th of the housing 16 through the vapor and / or liquid into the interior of the housing 16 can penetrate. This allows the steam and the liquid, e.g. B. for cleaning purposes, to the cone part 22nd of the chick 14th advance.

3 shows a schematic side view of a plug according to the invention 14th that in its cone part 22nd a fluid channel 11 and four wells 32 having. 4th shows one opposite 3 by 90 ° around the axis of rotation 18th of the chick 14th rotated side view. The chick 14th consists initially of a conical part 22nd leading to the formation of a stopcock 10 in a housing 16 is insertable, and a handle part 26th , which, as described above, simplifies the operation of the shut-off valve 10 a handle 24 having.

The cone part 22nd of the chick 14th has an outer surface, referred to herein as a conical surface 20th referred to as. The cone surface 20th includes the outer surfaces of the cone part 22nd that are radial to the axis of rotation 18th are arranged, ie its side surfaces, but not the end face 46 of the cone part 22nd . The cone surface 20th comprises four recesses lying opposite one another in pairs 32 .

The depressions 32 are of the same size and each have narrow sealing surfaces 34 surrounded, on which the conical part diameter-complementary to the interior of the housing 16 is. The sealing surfaces can therefore seal on the inner wall of the housing 16 issue. The interior of the case 16 is for this purpose, with the exception of the liquid channel 11 , which spans the housing, is conical. Will that be in 3 and 4th depicted chick 14th in the interior of the housing 16 pushed in, the sealing surfaces border 34 sealing to this interior space, while the base of each recess 32 from the inside wall of the case 16 is spaced. The sealing surfaces 34 showing the wells 32 are each continuous around the depressions 32 trained around. In the embodiment shown, the sealing surfaces unite 34 in addition, over the entire circumference of the conical part, which are arranged distally and proximally 22nd encompassing sealing surface rings 48 to a common sealing surface 34 . The sealing surface rings 48 are along the axis of rotation 18th at both ends of the cone part 22nd arranged.

The depressions 32 each have a square, trapezoidal base and correspondingly square side walls. Overall, the wells have 32 thus in each case the shape of a four-sided prism (trapezoidal prism). The height of the side walls of the wells 32 determines the depth of the respective recess 32 . The depth is sufficient in each case for a sufficiently good steam and / or liquid circulation between the inner wall of the housing 16 and the base of the wells 32 to ensure.

The cone part 22nd is from a fluid channel 11 spans, the shape and diameter complementary to fluid channels 11 in an in 3 and 4th inlet connection not shown 36 , the connecting parts 50 and the case 16 is. The two terminal openings in the cone part 22nd arranged liquid channel 11 are each in a recess 32 arranged. To an outflow of liquid from the liquid channel 11 To prevent the gap between the recess base area and the inner wall of the housing, it is conceivable also around the end channel openings in the conical part 22nd to arrange sealing surfaces around. According to the invention, however, this is not necessary since the volume of the space is small. Instead, it is preferred to determine the size ratio between the channel openings and the base area remaining around the channel openings of the respective deepening 32 to be designed in such a way that the remaining floor space is as small as possible. The channel opening can, for example, have a diameter in at least one direction that is the same as the diameter of the depression 32 in this direction is equal to or at least 80%, preferably 90%, thereof.

5 and 6th show schematic sectional views of the cone part 22nd and housing 16 of the stopcock according to the invention 10 . 5 shows the stopcock 10 in a fully open position and 6th in a fully closed position with no fluid passage through the fluid channel 11 can be done. The figures show sectional views from the direction of the handle part 26th , which is not shown in the figures. The housing can be seen 16 and the chick 14th the stopcock 10 as well as on both sides of the case 16 one connector each 50 .

The connecting parts 50 are integral with the housing 16 designed and used to establish a connection with an inlet port 36 or another part of the endoscope 12th through which a fluid channel 11 leads. The connecting parts 50 are tubular and are from the liquid channel 11 run through. In addition, the connecting parts 50 Connecting means, such as the locking elements shown 52 , by means of which a locking connection can be established. Alternatively, screw or Luer connections or combinations thereof are also conceivable.

Connecting parts 50 , Casing 16 and chicks 14th are all of fluid channels 11 spanning a common, continuous fluid channel 11 can form, as in 5 shown. By turning the chick 14th by 90 ° around its axis of rotation, as in 6th shown, the fluid channel 11 getting closed.

The case 16 has on both of its sides, ie on the sides parallel to one of the axis of rotation 18th and longitudinal axis of the liquid channel formed plane, each with a breakthrough 28 on, ie a total of two breakthroughs 28 . As in 6th Shown schematically by arrows, the shut-off valve can be in a closed position 10 in which the chick 14th is rotated by 90 ° in such a way that the common liquid channel 11 the stopcock 10 is closed, vapor or liquid through the breakthroughs 28 inside the case 16 enter. The two breakthroughs 28 and the one inside the cone part 22nd running fluid channel 11 are arranged in such a way that, in this closed position, steam and / or liquid pass through a first opening 28 enter, through the fluid channel 11 flow through inside the chick and out of a second opening 28 on the opposite side of the case 16 can exit again. This stream is in 6th indicated by arrows. The two breakthroughs 28 form with the one inside the chick 14th arranged liquid channel 18th thus an alternative vapor / liquid channel that only connects to the inside of the stopcock 10 and the instrument environment is connected, but not with the interior of the rest of the endoscope.

It's in the 5 and 6th recognizable that the cone part 22nd of the chick 14th four wells 32 has and with the around the depressions 32 arranged sealing surfaces 34 4-way is designed to be rotationally symmetrical. The depressions 32 each have a rectangular cross section. Two of the wells 32 are spanned by the fluid channel openings.

Although the present invention has been described in detail on the basis of the exemplary embodiments, it is self-evident for the person skilled in the art that the invention is not limited to these exemplary embodiments, but rather that modifications are possible in such a way that individual features are omitted or other types of combinations of the individual features presented are implemented provided that the scope of protection of the appended claims is not left. The present disclosure includes all combinations of the individual features presented.

List of reference symbols

10

stopcock

11

Fluid channel

12th

endoscope

13th

Shaft part

14th

chick

16

casing

18th

Axis of rotation

20th

Conical surface

22nd

Cone part

24

Handle

26th

Handle part

27

Side part

28

breakthrough

30th

Outer wall

32

deepening

34

Sealing surface

36

Inlet connection

38

eyepiece

40

Handle

42

Handle

44

Main body

46

Face

48

Sealing surface ring

50

Connecting part

52

Locking element

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was 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.

Patent literature cited

• DE 10126540 A1 [0002]
• DE 102014002158 B4 [0002]

Claims (10)

Stopcock (10) for a liquid channel (11) of a medical endoscope (12), with a plug (14) and a housing (16), the plug (14) being rotatably mounted in the housing (16) and in the direction of it Axis of rotation (18) lying one behind the other, has a conical part (22) having a conical surface (20) and a handle part (26) having a handle (24), the liquid channel (11) having the conical part (22), the conical surface (20) and the Housing (16) runs through, characterized in that the housing (16) in a side part (27) of its outer wall (30), which is arranged parallel to a plane defined by the longitudinal axis of the liquid channel (11) and the axis of rotation (18) of the plug, has one or more openings (28) and the conical surface (20) has one or more depressions (32) which are surrounded on all sides in the conical surface (20) by sealing surfaces (34) arranged in the conical surface (20) , wherein the sealing surfaces (34) sealingly to the Ge adjoin the housing (16). Shut-off valve (10) Claim 1 , characterized in that the one or more recesses (32) of the conical surface (20) each adjoin an opening (28) or the liquid channel (11), preferably for the case that the shut-off valve (10) is open. Stopcock (10) after one of the Claims 2 and 3 , characterized in that the housing (16) has four recesses (32). Stopcock (10) according to one of the preceding claims, characterized in that two depressions (32) are arranged on opposite sides of the conical part (22). Stopcock (10) according to one of the preceding claims, characterized in that two recesses (32) which are arranged on opposite sides of the conical part (22) are penetrated by the liquid channel (11). Stopcock (10) according to one of the preceding claims, characterized in that the one or more depressions (32) each essentially have the shape of a four-sided prism. Stopcock (10) according to one of the preceding claims, characterized in that in a central region of the conical surface (20) along the axis of rotation (18), sealing surfaces (34) and recesses (32) alternate along the circumference of the conical part (22). Shut-off valve (10) Claim 7 , characterized in that the sealing surfaces (34) in the circumferential direction of the conical part (22) are shorter than the recesses (32), preferably a quarter or less of the length of the recesses (32) in the circumferential direction. Stopcock (10) according to one of the preceding claims, characterized in that the conical surface (20) has sealing surfaces (34) in a proximal and distal section along the axis of rotation (18) which extend around the entire circumference of the conical part (22). Medical endoscope (12) with at least one fluid channel (11), characterized in that it comprises at least one shut-off valve (10) according to one of the preceding claims, by means of which the fluid flow through the fluid channel (11) can be regulated.

Images