DE102019112594A1 - Medical instrument, tap driver unit for a medical instrument and method for configuring a medical instrument - Google Patents

Abstract

A medical instrument according to the invention comprises a fluid conduit which can flow through a fluid channel (2, 2.1) and into which a tap driver seat (3) is inserted, a tap driver unit (4) being inserted into the tap driver seat (3), which has a closure body (6) with a this traversing fluid passage (7) comprises, wherein the hammer unit (4) comprises a sleeve-like bearing body (5) in which the closure body (6) of the hammer unit (4) is rotatably mounted, which bearing body (5) with the fluid channel (2, 2.1 ) and in an open position of the closure body (6) with the fluid passage (7) communicating openings (8, 8.1) and is inserted with its outer surface in a fluid-tight manner in the tap driver seat (3) and with an inner surface fluid-tight against the closure body ( 6) works. The invention also relates to a valve for a medical instrument, a tap driver unit and a method for configuring a medical instrument.

Description

The present invention relates to a medical instrument according to the preamble of claim 1, a tap driver unit for a medical instrument and a method for configuring a medical instrument.

Medical instruments through which substances are passed that are to be transported into or out of a human body are known for a wide variety of applications. For example, endoscopic instruments are known through which, during an endoscopic procedure, a rinsing fluid is conducted into the body and the rinsing fluid and possibly body fluids are conducted out of the body. It is also known in an endoscopic operation, for example, to feed an insufflation gas into the body to create an artificial body cavity through an appropriately designed instrument. For this purpose, medical instruments of this type generally have a device for opening and closing a line through which fluid can flow and, if necessary, for controlling or metering the fluid flow. Such a device is usually referred to as a valve or also, for example, as a shut-off valve or shut-off valve.

According to a common design, such a medical instrument has a conical tap driver seat, into which a tap driver unit is inserted to form the valve. The hammer unit comprises the hammer itself, which is usually designed as a conical closure body, and possibly an operating means connected to it for rotating the closure body about its longitudinal axis. The hammer or the hammer unit is also referred to as a plug or valve plug, and a corresponding valve as a plug valve or cone valve. The closure body has a fluid passage crossing this which, when the tap driver unit is inserted into the tap driver seat and in an open position, is in alignment with a channel of the line of the medical instrument through which fluid can flow. If a fluid flow in the line is to be reduced, the closure body is rotated around its longitudinal axis by means of the operating means, whereby the fluid passage changes its orientation. As a result, the effective opening, which is determined in particular by the overlap of the channel with the fluid passage, is reduced. If the fluid passage of the closure body and the channel of the line no longer overlap, the line is closed by the closure body and blocked for the flow of fluid.

Out DE 73 186 08 A valve is known which has a body with a first through bore and a frustoconical second through bore which penetrates the first bore, and a frustoconical, rotatably arranged plug with a third penetrating bore which is seated in the second bore and wherein the third hole is arranged so that it is in communication with the first hole or not depending on the rotational position of the plug.

In DE 10 2014 010 398 A1 describes a plug valve for controlling a fluid flow in a fluid line of a medical instrument, which has a housing penetrated by a channel, the channel within the housing breaking through a seat surface of a conical seat incorporated in the housing at two opening points. A conical plug rotatably mounted in the conical seat with a passage can be rotated into an open and a closed position in such a way that in the open position the passage communicates the two opening points of the channel and in the closed position the channel is interrupted by a wall of the conical plug. The conical plug is held in the conical seat with a retaining element reaching through an opening in the housing.

In the case of medical instruments of the type mentioned, instrument grease is usually used for the fluid-tight sealing of the tap driver unit against the tap driver seat. This must be brought into the tap driver seat when inserting the tap driver unit. If the medical instrument, in particular a reusable medical instrument, is to be cleaned or sterilized, with the tap driver unit generally being removed from the tap driver seat, the instrument grease must be removed and reintroduced after cleaning or sterilization. This results in additional effort in the configuration and in the preparation of reusable instruments. Furthermore, the fluid passed through the valve can come into contact with the instrument grease and thereby possibly be contaminated, especially if the tap driver unit is turned several times or the valve is only partially opened or partially closed. Furthermore, it is not excluded, especially if the openings are kept sharp-edged for a coherent transition between the fluid-flowable line of the medical instrument and the tap driver unit, that counter material is rubbed over the openings when the tap driver unit is turned in the tap driver seat of the medical instrument, which is not just one Wear, but possibly also contamination of the fluid passed through can result.

It is an object of the present invention to provide a medical instrument with a To specify a tap driver unit, such a tap driver unit for a medical instrument and a method for configuring a medical instrument with a tap driver unit, the above-mentioned disadvantages being avoided as far as possible. In particular, it is the object of the invention to provide a medical instrument with a hammer seat and a hammer unit inserted therein, which has improved tightness and can also be configured simply and safely, and to specify a corresponding method for configuring the medical instrument, which method is simpler and enables increased security.

This object is achieved by a medical instrument according to claim 1, by a hammer unit according to claim 15 and by a method according to claim 16.

Advantageous further developments of the invention emerge from the subclaims.

A medical instrument according to the invention comprises a line through which fluid can flow and which has a fluid channel through which a fluid can flow. A fluid is understood to mean a liquid or a gas, in which a liquid, for example a rinsing liquid, can certainly also carry solid components, such as pieces of tissue. The medical instrument is, in particular, an endoscopic instrument that has an elongated shaft that is designed for insertion into a natural or artificially created body cavity of a human or animal body and through which a fluid can be conducted into and / or out of the body cavity can; the conduit through which fluid can flow can, for example, run through the shaft or at its proximal, i.e. close to the user, be connected to this end.

A valve driver seat is inserted into the fluid-permeable line, i. in particular that the fluid channel of the line through which fluid can flow is divided into two sections by the tap driver seat. The tap driver seat preferably extends transversely to the fluid direction, which is referred to here as the axial direction, and is open on one side in the axial direction. The tap driver seat forms a seat which has openings through which the fluid can flow, in particular two openings which are formed by the mouths of the two sections of the channel in the seat and which can be arranged opposite one another or at an angle to one another in the tap driver seat. The tap driver seat can be designed as a valve housing, for example.

The medical instrument further comprises a tap driver unit which is inserted into the tap driver seat, whereby in particular a valve in the above-mentioned sense is formed. The tap driver unit is preferably detachably inserted into the tap driver seat. The tap driver unit includes a closure body having a fluid passage traversing the closure body. The fluid passage runs in particular transversely to a longitudinal axis of the closure body and preferably extends through the closure body in a radial direction in relation to the longitudinal axis. The fluid passage preferably runs without a curve in order to prevent pieces of tissue from settling in the fluid passage. Nevertheless, the fluid passage in the closure body can also be curved or angled, for example when the tap driver unit is inserted into a tap driver seat in which the sections or the mouths of the channel are not aligned, but are arranged at an angle to one another. The fluid passage typically has the same cross-sectional area as the channel of the line of the medical instrument through which fluid can flow, so that a flow of the fluid through the valve is not impaired or hindered. Depending on the medical instrument, a larger or smaller cross-sectional area or a shape of the fluid passage that tapers in one or both directions can also be conceivable.

The hammer unit can comprise an operating means for rotating the closure body about its longitudinal axis, which is preferably connected to the closure body in a rotationally fixed manner or connected to it or is also formed in one piece with it. As a result, the alignment of the fluid passage can be changed and the closure body can be rotated in particular into an open and a closed position.

According to the invention, the hammer unit further comprises a sleeve-like bearing body. The bearing body is sleeve-shaped at least in sections and has an outer jacket surface and an inner surface, at least a partial area of the inner surface being designed as a bearing surface for the closure body. The bearing body can have an axial extension which at least largely corresponds to the axial extension of the tap driver seat. The closure body is rotatably mounted about its longitudinal axis in the bearing body. The longitudinal axis of the closure body can at least approximately correspond to the axial direction of the bearing body and is in particular directed transversely to the direction of flow of the fluid, but the longitudinal axis can also be directed obliquely to this or, if the bearing body is flexible, the closure body can be flexibly mounted.

In order to enable fluid to flow through in the open position, the bearing body has openings which on the one hand communicate with the fluid channel, ie are in fluid connection with the fluid channel or the two sections of the fluid channel, and on the other hand in the open position of the closure body communicate with the fluid passage, ie are in fluid connection with the fluid passage of the closure body. In particular, the openings in the bearing body are arranged at corresponding positions at which the mouths of the fluid passage are located in the open position. The openings are thus aligned or overlapping with the fluid passage or the mouths of the fluid passage of the closure body, so that a fluid flowing through the tap driver unit first passes a first opening in the bearing body, then the fluid passage of the closure body and finally another opening in the bearing body. A fluid conducted through the medical instrument can therefore flow through the valve, formed from the tap driver seat and tap driver unit, when the closure body is in the open position.

For closing, the closing body can be rotated into such a position that the fluid passage of the closing body no longer connects to the openings in the bearing body and thus no longer the sections of the fluid channel of the line of the medical instrument through which fluid can flow, or the openings no longer connect or at most only to a small extent overlap with the mouths of the fluid passage. In the closed position of the closure body, the fluid passage is therefore no longer or essentially no longer in fluid communication with the openings, and a fluid flow conducted through the medical instrument is thus at least largely interrupted. The closure body can be rotated into further positions, in particular intermediate positions can be possible between the open position and the closed position, in which a part of at least one opening of the bearing body is closed by the closure body, so that metering of the fluid flowing through is possible.

The outer surface of the bearing body is inserted into the tap driver seat in a fluid-tight manner. Here, the jacket surface of the bearing body is referred to as the “outer jacket surface” in order to distinguish it from the inner surface of the sleeve-shaped bearing body, which is also referred to here as the “inner jacket surface”. The bearing body thus seals with its outer surface with respect to the tap driver seat. For this purpose, the bearing body can have a lower hardness than the tap driver seat. In particular, the bearing body is non-rotatable or is inserted into the tap driver seat to the extent that it is subject to friction so that it is not rotated when the closure body is rotated. For the purpose of sealing, the bearing body is preferably adapted with its outer jacket surface at least in the area of its perforations to the hammer seat of the medical instrument and thus has the same shape at least in the relevant areas. In particular, the outer circumferential surface of the bearing body is at least partially in sealing contact with the seat surface of the tap driver seat. The bearing body is preferably held accordingly in the tap driver seat. The fluid-tight seal can prevent gases, liquids or solids from escaping between the tap seat of the medical instrument and the bearing body.

Furthermore, the bearing body acts fluid-tight against the closure body with an inner surface. For this purpose, the bearing body is preferably made of a material that has a lower hardness than the closure body. In particular, it can be sufficient for the seal if the inner surface of the sleeve-shaped bearing body is designed for fluid-tight sealing against the closure body only in its areas surrounding the perforations. Alternatively or additionally, such a region of the inner lateral surface of the bearing body in which the closure body is mounted in the bearing body can assume the sealing function, or essentially the entire inner lateral surface of the bearing body can be designed for this purpose. If the tap driver unit is in the open position, a fluid flowing through the tap driver unit thus passes through the transitions between the openings in the bearing body and the fluid passage of the closure body without the fluid escaping from this predetermined flow path. If the tap driver unit is in the closed position, the closure body closes the openings in the bearing body at least largely, with the fluid-tight seal of the bearing body against the closure body rotatably mounted in it preventing the fluid from escaping between the bearing body and the closure body.

According to the invention, the faucet grater unit is thus constructed in several parts and, in contrast to the faucet grater units from the prior art, also has a bearing body. According to the invention, it has been recognized that such a design of the tap driver unit is advantageous, in which different components are provided for the function of closing and for the function of sealing. While the closure body takes over the valve function for opening or blocking a fluid flow, the bearing body seals against the closure body and against the tap driver seat of the medical instrument.

The fact that the tap driver unit comprises a sealingly inserted sleeve-like bearing body in which the closure body is sealed and rotatably mounted, the bearing body having openings which are in fluid connection with the fluid channel and in an open position with the fluid passage and in a closed position are blocked by the closure body, a medical instrument with a valve is created in which the use of instrument grease or other additional seals is not required. In the valve of the medical instrument, the bearing body thus not only takes on the bearing function for the closure body, which can also be referred to as a valve inlet, but also the sealing function. In this way, an improved tightness can be ensured at the same time, since this is essentially based on the nature of the tap driver unit and can therefore be reproducibly provided by the manufacturer and does not rely on laborious preparation by a user for inserting the tap driver unit, in particular the application of instrument grease. This simplifies the preparation of the medical instrument for use.

The medical instrument can be a resectoscope shaft or a resectoscope, for example, but can also be designed as an insufflation needle or as a trocar, for example. The medical instrument can comprise further components. The medical instrument can also be designed as a valve unit which only comprises the valve formed by the tap driver seat and the tap driver unit as well as short sections of the line or connections for the line connected to the tap driver seat, whereby the valve unit is connected to further lines, for example hose lines can. The valve formed by the tap driver seat and the tap driver unit can also be referred to as a metering valve or metering tap.

Preferably, the closure body is positively connected to the bearing body in an axial direction of the bearing body. As a result, the closure body is secured against axial displacement within the bearing body, while the radial bearing is effected by the inner circumferential surface of the bearing body. In one embodiment, such a form-fitting connection takes place by axially supporting the closure body relative to the bearing body, for example via one or more collars. In another embodiment, the closure body has a thickening with which it engages in a recess in the bearing body provided for this purpose. Because the closure body is positively connected to the bearing body, not only can the sealing of the closure body relative to the bearing body be improved, but it can also be made possible to provide this as a pre-assembled unit for inserting the hammer unit, the closure body being captive in the bearing body is held.

Advantageously, the closure body of the hammer unit is at least approximately cylindrical, at least in the area in which it is mounted in the bearing body. The same applies to the section or sections of the inner circumferential surface of the bearing body which represent the counter-bearing to the cylindrical bearing points of the fluid body. In this way, a defined contact of the closure body on the bearing body and also a particularly secure seal against leakage of the fluid from the valve can be ensured.

According to a preferred embodiment of the invention, the closure body of the tap driver unit has a thickening which comprises the fluid passage, the thickening being arranged in the area of the openings in the bearing body. The fluid passage extends through the thickening, so that the fluid passage can have a greater clear width, while the closure body can nevertheless have a sufficient remaining wall next to the fluid passage. In a particularly preferred manner, the thickening protrudes into a corresponding recess in the bearing body or in the openings in the bearing body or penetrates them. The thickening makes it possible for the passage that the valve has in the open position to have a particularly large cross-section, thus enabling a virtually unimpeded flow of fluid through the valve. At the same time, the remaining wall ensures the stability and the closing function of the closing body. A thickening provided in this way is also advantageous in that it can be used to secure the closure body in a form-fitting manner against axial displacement.

According to a particularly preferred embodiment, the thickening is at least approximately spherical. In this way, the space of the tap driver seat can be used optimally, on the one hand to ensure effective closure by the closure body and on the other hand to provide the fluid passage of the closure body with the largest possible cross-sectional area through which it can flow.

The seat surface formed by the tap driver seat of the medical instrument is preferably designed in the shape of a truncated cone, and the outer jacket surface of the bearing body of the tap driver unit is also frustoconical. This frustoconical design is advantageous on the one hand because this enables simple insertion. On the other hand, this shape makes it possible, by setting an axially directed preload between the bearing body and the tap driver seat, to ensure a fluid-tight arrangement of the bearing body in the tap driver seat, that is, a fluid-tight fit of the outer surface of the bearing body on the seat surface of the tap driver seat. Furthermore, the frustoconical design of the bearing body makes it possible to insert this or the hammer unit into a hammer seat of a conventional medical instrument which has a cone valve with a conical seat in a known design. With such a conventional valve, the tap driver can thus be replaced by the tap driver unit according to the invention. In a particularly advantageous manner, this opens up the possibility of equipping conventional medical instruments of the type mentioned with a tap driver unit according to the invention, as a result of which the tightness of the instrument can be improved and the preparation for use can be simplified.

The hammer unit preferably has an operating means connected to the closure body in a rotationally fixed manner for rotating the closure body about its longitudinal axis, wherein the operating means can in particular be an L-shaped control element molded on the closure body in the axial direction. This enables the valve to be operated manually in a simple manner, and the position of the L-shaped operating element can also make it possible to identify whether the valve is in its open or closed position. The L-shape results in a lever that simplifies controlled turning of the closure body for metering the fluid flow. It goes without saying that instead of such an L-shaped operating element, an operating button or a differently shaped operating means can also be provided.

To axially secure the tap pulley unit in the tap pulley seat, a holding means can advantageously be connected to the bearing body and / or the closure body of the tap pulley unit, in particular axially opposite the operating device, which is used to hold the tap pulley unit axially in the tap pulley seat. The holding means can be an axial extension of the bearing body and / or the closure body provided with a screw thread, which, for example, holds the hammer unit in the hammer seat together with a self-locking nut, a spring nut or a spring cap. It can be sufficient to hold the closure body axially if it is held positively in the bearing body by means of an axially acting stop or in some other way; in this case the bearing body is held in the tap driver seat via the closure body. In this way, a defined depth of insertion of the tap driver unit into the tap driver seat can be established in order to ensure alignment of the fluid channel of the fluid-permeable line of the medical instrument and the openings in the bearing body of the tap driver unit. In addition, for example, a screw thread and such a nut can easily be used to set a preload suitable for sealing between the bearing body and the closure body and between the bearing body and the tap driver seat.

According to a preferred embodiment of the invention, the bearing body of the hammer unit has a radially protruding tab, the tab being inserted into a recess in the medical instrument. The tab is preferably arranged at an axial end of the bearing body, for example at that end at which the operating means for rotating the closure body is arranged. The tab is inserted into a recess or under a projection which is fixed in the axial direction relative to the tap driver seat. The projection can, for example, be formed by the tap driver seat itself or can be provided on the medical instrument in the vicinity of the tap driver seat. The tab and the projection or the recess can be designed, for example, in the manner of a bayonet lock. This enables extremely simple, quick and defined assembly. In addition, an axial securing of the bearing body in the tap driver seat can hereby be ensured, which can be provided as an alternative or in addition to the holding means.

The bearing body of the hammer unit preferably has an anti-rotation cam protruding in the radial direction for cooperation with at least one anti-rotation stop of the hammer seat or the medical instrument. In a particularly preferred manner, the above-mentioned tab of the bearing body protruding in the radial direction can also serve as an anti-rotation cam to interact with the at least one anti-rotation stop of the hammer seat or the medical instrument, for which purpose, for example, the recess can be arranged and dimensioned according to the tab. In this way it can be ensured that the bearing body is inserted in such a way that the openings are aligned with the fluid channel and that the bearing body is not rotated within the tap driver seat when the closure body is rotated.

In a preferred manner, the closure body has a stop cam which protrudes in the radial direction for interaction with at least one rotation-limiting stop of the tap driver seat or of the medical instrument. In particular, two rotation limiting stops can be provided which are spaced apart from one another at a certain angular distance, for example by such a circumferential angle by which the closure body must be rotated between the open and closed positions. This enables the closure body to be adjusted freely and easily during operation. The stop cam is preferably arranged at that end at which the operating means for rotating the closure body is arranged, and is in particular arranged in the axial direction outside the above-mentioned tab of the bearing body so that the stop cam engages over the tab. This makes it possible to use the above-mentioned bearing body at least one anti-rotation stop of the bracket at the same time as a rotation-limiting stop for limiting the angle of rotation of the closure body.

In order to improve the sealing effect of the bearing body of the hammer unit, it is provided in a preferred embodiment that the bearing body has a lower hardness than the closure body and the hammer seat. The bearing body can for example be made of a soft plastic, which can also have elastic properties, so that the bearing body is flexible. In this way, it can be achieved that the bearing body, standing under a pretension, rests against the closure body and the hammer seat and hugs the hammer seat and the closure body in a sealing manner. In particular, a preload can be provided between the bearing surfaces of the bearing body and the closure body using the material properties of the bearing body. In an advantageous manner, this can at the same time have the effect that, after the closure body has rotated, it remains in its position due to the friction or a press fit between the bearing body and closure body. Furthermore, the fact that the bearing body is made of a soft plastic and takes on a sealing and bearing function, but is not rotated in the tap driver seat during operation, can prevent the possibly sharp-edged mouths of the fluid channel and the fluid passage when turning the Closure body material is rubbed off, which would be transported into the human body with the fluid.

In a particularly advantageous manner, the closure body can also be made from a plastic. The bearing body and / or the closure body can be produced by a plastic injection molding process.

In a particularly preferred manner, the hammer unit can be designed as a disposable product, with the bearing body and the closure body in particular being made of plastic. In particular, the medical instrument can be reusable, with the hammer unit being designed as a disposable product. The medical instrument can consist of a metallic material, for example stainless steel, and can be sterilized, in particular autoclavable. The tap driver unit, designed as a disposable product, can for example be provided as a sterile, pre-assembled unit and inserted into the tap driver seat of the instrument when preparing for use of the medical instrument and removed from it again after use. There is no need to reprocess the faucet unit for reuse. The design of the tap grater unit according to the invention enables particularly simple and secure assembly and at the same time ensures secure sealing.

A hammer unit according to the invention for a medical instrument comprises a closure body with a fluid passage crossing this, as well as a sleeve-like bearing body in which the closure body of the hammer unit is rotatably mounted, which bearing body has openings communicating with the fluid passage in an open position of the closure body, wherein a outer circumferential surface of the bearing body is frustoconical, and wherein the bearing body acts with an inner surface in a fluid-tight manner against the closure body. The hammer unit is designed in particular as described above and can be inserted into a frustoconical seat surface of a hammer seat of a medical instrument. The tap driver unit can in particular be provided as a prefabricated unit, which can also be referred to as a tap driver module.

According to a method according to the invention for configuring a medical instrument, which instrument comprises a fluid-through-flow line having a fluid channel into which a tap driver seat is inserted, a tap driver unit is provided which comprises a closure body with a fluid passage crossing this and a sleeve-like bearing body. The closure body of the hammer unit is rotatably mounted in the bearing body, the bearing body having an inner surface acting in a fluid-tight manner against the closure body; Furthermore, in an open position of the closure body, the bearing body has perforations that communicate with the fluid passage of the closure body. The closure body can have been inserted into the bearing body in a preceding method step or the tap driver unit can have been provided as a preassembled unit. According to the invention In the method, the tap driver unit with an outer jacket surface of the bearing body is inserted in a fluid-tight manner into the tap driver seat in such a way that the openings in the bearing body communicate with the fluid channel. The medical instrument and the hammer unit are designed in particular as described above. The medical instrument can, for example, be a reusable instrument that is designed for cleaning and sterilization, for example by autoclaving, wherein the tap driver unit can be a replaceable, disposable part.

• 1 ein Ausführungsbeispiel eines erfindungsgemäßen medizinischen Instruments;
• 2a bis 2d ein medizinisches Instrument gemäß einem ersten Ausführungsbeispiel der Erfindung im Bereich des Hahnreibersitzes in zwei Schnittdarstellungen und zwei Ansichten in einer Geschlossen-Stellung;
• 3a bis 3d das medizinische Instrument gemäß 2a bis 2d in einer Offen-Stellung;
• 4a und 4b ein medizinisches Instrument gemäß einem zweiten Ausführungsbeispiel der Erfindung im Bereich des Hahnreibersitzes in einem Querschnitt und einer Schrägansicht;
• 5 ein medizinisches Instrument gemäß einem dritten Ausführungsbeispiel der Erfindung im Bereich des Hahnreibersitzes in einem Querschnitt in einer Geschlossen-Stellung;
• 6 das medizinische Instrument gemäß 5 in einer Offen-Stellung.

Further aspects of the invention emerge from the following description of preferred exemplary embodiments and the accompanying drawings. Show it:

• 1 an embodiment of a medical instrument according to the invention;
• 2a to 2d a medical instrument according to a first embodiment of the invention in the area of the hammer seat in two sectional representations and two views in a closed position;
• 3a to 3d the medical instrument according to 2a to 2d in an open position;
• 4a and 4b a medical instrument according to a second embodiment of the invention in the area of the tap driver seat in a cross section and an oblique view;
• 5 a medical instrument according to a third embodiment of the invention in the area of the tap driver seat in a cross section in a closed position;
• 6th the medical instrument according to 5 in an open position.

In 1 is an example of a medical instrument according to the invention 1 shown. In the example shown, the medical instrument is a resectoscope which is designed for insertion into a human or animal body. The instrument 1 includes a shaft 30th , through which a fluid, usually a rinsing liquid in the example shown, can be conducted into the human or animal body and through which the rinsing liquid can be conducted out of the body again. For this purpose, the shaft 30th a flushing connection 31 and a suction connection 32 on which hoses can be connected to establish the connection to the corresponding containers and / or pumps. The flushing connection 31 and the suction connection 32 thus form lines 20th through which the fluid, in this case the rinsing liquid, can flow. The lines 20th are with the stem 30th connected or continued through this.

The illustrated medical instrument 1 includes further elements, in particular a handle 33 , a look 34 and an electrode assembly. The shaft 30th is with the handle 33 via a clutch 35 releasably connected. The shaft 30th can also be viewed on its own as a medical instrument within the meaning of the present invention.

The medical instrument 1 is essentially made of stainless steel according to the example shown and designed as a reusable instrument. In the suction and rinsing connection 31 , 32 is a tap driver seat 3 switched on, in a tap driver unit 4th is used. The rooster seat 3 forms together with the tap driver unit used in these 4th a valve for opening and closing as well as for partially opening the lines 20th so that a metered flow of irrigation fluid can be directed into and out of the body. By means of a metered supply and discharge of the rinsing liquid, an amount of liquid and a pressure in a cavity inside the body, in which the shaft 30th of the resectoscope is inserted, can be controlled.

In the 2a to 6th is the medical instrument 1 only in the area of the tap driver seat 3 and the tap driver unit 4th formed valve shown. The 2a to 2d show the valve according to a first embodiment of the invention in a closed position in two sectional representations and two views. The sectional view according to 2a shows a longitudinal section through the line 20th or through a fluid channel 2 , 2.1 of the line, ie a sectional view in a plane which has a central axis of the fluid channel 2 , 2.1 and a longitudinal axis 11 of the closure body 6th contains. 2 B Figure 3 shows a cross-section in a plane containing the longitudinal axis 11 of the closure body 6th contains, but perpendicular to the central axis of the fluid channel 2 , 2.1 and is thus perpendicular to the direction of flow of the fluid. 2c represents an oblique view, and 2d a plan view from the direction of an operating lever 14th of the valve, which is referred to below as "above".

As in 2a can be seen, the fluid channel of the line 20th through which the fluid is passed, through which in the line 20th switched-on valve divided into two sections, denoted in the figures by the reference symbols 2 , 2.1 are designated. About the federal government 23 a tube can be pushed through which the fluid is passed to the instrument 1 is fed in or discharged from it (s. 2c , 2d ). The rooster seat 3 is also made of stainless steel in the example shown. The rooster seat 3 shows a radially symmetrical, frustoconical seat 21st on. The opening of the hammer seat 3 is for inserting a tap driver unit 4th across the fluid-through-flow line 20th or to the fluid channel 2 , 2.1 of the medical instrument 1 aligned.

The tap driver unit 4th is in two parts and includes a bearing body 5 and a closure body 6th . The bearing body 5 and the closure body 6th are plastic parts in the illustrated embodiment. The tap driver unit 4th lies at the cocker’s seat 3 with that of the tap driver unit 4th associated bearing body 5 sealing. The outer surface of the bearing body 5 is on the outer surface of the tap driver seat 3 adapted and thus also frustoconical. In the bearing body 5 is the closure body 6th rotatably mounted. The closure body 6th has a fluid passage 7th on, of the closure body 6th straight crosses and which in the illustrated embodiment is designed as a straight cross bore with an approximately constant cross section. With regard to the axial extent of the bearing body 5 are at the same height as the fluid passage 7th in the bearing body 5 Breakthroughs 8th , 8.1 brought in. These have the same cross-sectional geometry and cross-sectional area as the fluid passage 7th on. In 2a is the truncated cone shape of the outer surface of the bearing body 5 also in the area of the openings 8th , 8.1 indicated.

The tap driver unit 4th is so far in the cockpit 3 used that the breakthroughs 8th , 8.1 of the bearing body 5 are at the same level as the fluid channels 2 , 2.1 so that they are aligned. The inside diameter of the tap driver seat is corresponding 3 on the outside diameter of the bearing body 5 customized.

In order to obtain an optimal sealing effect, the bearing body 5 a lower hardness than the closure body 6th and as the cockerel seat 3 . In addition, the bearing body 5 made of a plastic with a certain material elasticity. Any bumps in the tap driver seat 3 or on the closure body 6th can thus be balanced. Due to the frustoconical seat of the bearing body 5 in the cocker’s seat 3 can this on the tap driver's seat 3 act with a certain preload, creating a sealing contact pressure against the tap driver seat 3 and also towards the closure body 5 can be adjusted.

The closure body 6th has a spherical thickening 9 roughly in the middle of his in the cockerel seat 3 immersed extension. The fluid passage 7th of the closure body 6th penetrates this thickening 9 . At the same time, the thickening takes effect 9 with its spherical outer surface in the in 2a position shown in the openings 8th , 8.1 of the bearing body 5 one. This is the bearing body 5 compared to an adjustment in the axial direction of the closure body 6th held positively on this.

The bearing body 5 lies with its inner, cylindrical lateral surface on cylindrical, on the thickening 9 adjacent storage areas 10 , 10.1 of the closure body 6th at. This is how the closure body is 6th within the bearing body 5 around its longitudinal axis 11 rotatably mounted. At the same time, the bearing surfaces serving for radial bearing act 10 , 10.1 as sealing surfaces between the bearing body 5 and the closure body 6th . The closure body 6th is at this point through the bearing body 5 framed in such a way that a fluid which flows to one of the openings 8th , 8.1 gets, not between the bearing body 5 and the closure body 6th can get outside. The storage areas 10 , 10.1 of the closure body 6th are in the illustrated embodiment with a certain preload on the complementary bearing surfaces of the bearing body 5 at. A frictional connection between these two parts also ensures that the closure body which has been set to a specific rotational position by a user 6th remains in position.

The closure body 6th comprises for actuating the valve, ie for rotating the closure body 6th around its longitudinal axis 11 , an L-shaped control lever 14th , whose L-shape in 2c is shown. The control lever 14th is to the closure body 6th molded.

To prevent when rotating the breech block 6th the bearing body 5 is rotated, includes the bearing body 5 an anti-rotation cam 12 . This anti-rotation cam 12 protrudes in the radial direction from the in the 2a to 2c upper end of the bearing body 5 from. In 2d is the anti-rotation cam 12 to be seen in the top view from above. The anti-rotation cam 12 is designed as a radial tab between two on the tap driver seat 3 attached stops 13 is edged. The attacks 13 act with the anti-rotation cam 12 of the bearing body 5 so together so that the bearing body 5 not about the longitudinal axis 11 can be rotated. The anti-rotation cam serves at the same time 12 an insertion coding, which ensures that when inserting the tap grater unit 4th the bearing body 5 with its breakthroughs 8th , 8.1 with respect to the mouths of the sections of the fluid channel 2 , 2.1 in the cocker’s seat 3 is correctly aligned.

To secure the tap driver unit 4th in the axial direction of the anti-rotation cam under an in 2a indicated projection of the tap driver seat 3 be used. It is also used to hold the closure body 6th in the bearing body 4th and, since the closure body with a head plate 25th on the bearing body 4th is placed, thus also to hold the bearing body 4th in the cockpit 3 against its direction of insertion, a spring cap is provided which is attached to a holding means 15th , here a screw thread, which is on the control lever 14th opposite end of the closure body 6th is connected, is screwed. The spring cap includes a cap 17th that has a spring element 18th and a ring against an underside stop surface 16 of the cock driver seat 3 acts and provides a defined axial holding force. The spring cap is in 2a not shown.

In the 2a to 2d is the hammer unit 4th shown in their closed position. The mouths of the fluid passage 7th of the closure body 6th do not align with the breakthroughs 8th , 8.1 of the bearing body 5 . That in the medical instrument 1 activated valve is closed in this position. In the sectional view according to 2a , in which the fluid channel 2 , 2.1 runs in the cutting plane is the fluid passage 7th shown in its cross section. The fluid flow is through the adjacent the fluid passage 7th remaining areas of the closure body 6th caused by the spherical thickening 9 are formed, blocked. In the in 2 B The sectional view shown extends through the fluid passage 7th in the cutting plane, the fluid channel running perpendicular to the plane of the drawing 2 , 2.1 through the wall of the closure body 6th is blocked. In 2c is the corresponding position of the control lever 14th shown. In 2d it can be seen that a stop cam 22nd of the closure body on a closed stop of the tap driver seat 3 is applied.

The 3a to 3d show the valve in the open position, the representations otherwise being those of 2a to 2d correspond. The closure body is in the open position 6th compared to the closed position by 90 ° around its longitudinal axis 11 rotated so that the mouths of the fluid passage 7th with the breakthroughs 8th , 8.1 of the bearing body 5 cursing.

In 3a it is shown that the two sections of the fluid channel 2 , 2.1 about the breakthrough 8th , the fluid passage 7th and the breakthrough 8.1 are connected to each other. The breakthroughs 8th , 8.1 and the fluid passage 7th the same cross section as the fluid channel 2 , 2.1 on. On the fluid channel 2 , 2.1 of the medical instrument 1 Fluid flowing through can do this unhindered through the tap driver seat 3 and the tap driver unit 4th formed valve pass. In 3a are the truncated cone shape of the outer surface of the bearing body 5 in the area of the openings 8th , 8.1 and the mouths of the fluid passage 7th indicated.

In 3b the valve is seen in the direction of flow of the fluid. The fluid can pass through the fluid passage 7th happen. As in 3b can be seen, the thickening takes hold 9 of the closure body 6th in this position in a recess in the bearing body 5 one that adheres to the breakthroughs 8th , 8.1 adjoins in the circumferential direction. In 3c is the corresponding position of the control lever 14th shown. In 2d it can be seen that the stop cam 22nd of the closure body at an open stop of the tap driver seat 3 is applied.

In 4a and 4b a valve according to a second embodiment is shown, the illustration in FIG 4a the in 3b and the representation in 4b the in 3c corresponds. 4a and 4b show the valve in the open position. In the 4a and 4b The second embodiment shown differs from that according to FIG 2a to 3d in that at the lower end of the closure body 6th instead of the connecting means designed as a screw thread 15th a rest 24 is attached, which is under the stop surface 16 engages and thereby the closure body 6th with the bearing body 5 in the cocker’s seat 3 holds.

Otherwise, the second embodiment corresponds to the first embodiment of the invention described above.

In the 5 and 6th is a third embodiment of a valve or medical instrument according to the invention 1 shown, where in 5 the closed position in a cross-sectional view accordingly 2 B and in 6th the open position in a cross-sectional view according to 3b are shown. In contrast to the exemplary embodiments explained above, the closure body in the third embodiment is continuously cylindrical. As in 5 can be seen are the ones next to the fluid passage 7th remaining areas of the wall of the closure body 5 not sufficient to completely block the fluid channel, but in the closed position a small fluid flow is possible due to a reduced cross section. Furthermore, the cross section of the fluid passage 7th that is in the in 6th shown open position can be seen, somewhat smaller than in the previously described embodiments and thus somewhat smaller than the cross section of the fluid channel 2 , 2.1 . By further reducing the cross-section of the fluid passage 7th could enable further or complete blocking in the closed position however, partial lockout may be sufficient for many applications.

For the sake of clarity, not all reference symbols are shown in all figures. Reference symbols that are not explained for a figure have the same meaning as in the other figures.

List of reference symbols

1

Medical instrument

2, 2.1

Fluid channel

3

Rooster seat

4th

Tap driver unit

5

Bearing body

6

Locking body

7th

Fluid passage

8, 8.1

Breakthrough

9

thickening

10, 10.1

storage area

11

Longitudinal axis

12

Anti-rotation cams

13th

attack

14th

Control lever

15th

Holding means

16

Stop surface

17th

cap

18th

Spring element

19th

ring

20th

management

21st

Seat

22nd

Stop cam

23

Federation

24

Rested

25th

Headstock

30th

shaft

31

Flushing connection

32

Suction connection

33

Handle

34

optics

35

coupling

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 7318608 [0004]
• DE 102014010398 A1 [0005]

Claims (16)

Medical instrument (1) with a fluid conduit (2, 2.1) having a fluid-flowable line (20) into which a tap driver seat (3) is inserted, a tap driver unit (4) being inserted into the tap driver seat (3), which has a closure body ( 6) with a fluid passage (7) crossing this, characterized in that the tap driver unit (4) comprises a sleeve-like bearing body (5) in which the closure body (6) of the tap driver unit (4) is rotatably mounted, which bearing body (5) with the fluid channel (2, 2.1) and in an open position of the closure body (6) with the fluid passage (7) communicating openings (8, 8.1) and is inserted with its outer surface in a fluid-tight manner in the tap driver seat (3) and with a inner surface acts fluid-tight against the closure body (6). Medical instrument after Claim 1 , characterized in that the closure body (6) is positively connected to the bearing body (5) in the axial direction. Medical instrument after Claim 1 or 2 , characterized in that the closure body (6) of the hammer unit (4) is designed to be cylindrical, at least in an area in which it is mounted in the bearing body (5). Medical instrument according to one of the preceding claims, characterized in that the closure body (6) of the tap driver unit (4) has a thickening (9) surrounding the fluid passage (7). Medical instrument after Claim 4 , characterized in that the thickening (9) is at least approximately spherical. Medical instrument according to one of the preceding claims, characterized in that a seat surface (21) of the tap driver seat (3) and the outer jacket surface of the bearing body (5) of the tap driver unit (4) are frustoconical. Medical instrument according to one of the preceding claims, characterized in that the hammer unit (4) comprises an operating means connected to the closure body (6) for rotating the closure body (6) about a longitudinal axis (11) of the closure body (6), the operating means on the closure body (6) is formed in the axial direction as an L-shaped operating element. Medical instrument according to one of the preceding claims, characterized in that on the bearing body (5) and / or the closure body (6) of the hammer unit (4) a holding means (15) for axially holding the hammer unit (4) in the hammer seat (3) connected. Medical instrument according to one of the preceding claims, characterized in that the bearing body (5) of the hammer unit (4) has a radially protruding tab, the tab being inserted into a recess in the medical instrument (1). Medical instrument according to one of the preceding claims, characterized in that the bearing body (5) of the hammer unit (4) has a rotation locking cam (12) protruding in the radial direction for interaction with at least one rotation locking stop (13) of the medical instrument (1). Medical instrument according to one of the preceding claims, characterized in that the closure body (5) of the hammer unit (4) has a stop cam (12) protruding in the radial direction for interaction with at least one rotation-limiting stop of the medical instrument (1). Medical instrument according to one of the preceding claims, characterized in that the bearing body (5) of the hammer unit (4) has a lower hardness than the closure body (6) and the hammer seat (3). Medical instrument according to one of the preceding claims, characterized in that the closure body (6) and / or the bearing body (5) of the hammer unit (4) are made of plastic. Medical instrument according to one of the preceding claims, characterized in that the medical instrument (1) is designed to be reusable, the tap framer unit being designed as a disposable product. Tap driver unit for a medical instrument (1) which comprises a closure body (6) with a fluid passage (7) crossing this, characterized in that the tap driver unit (4) comprises a sleeve-like bearing body (5) in which the closure body (6) of the Tap driver unit (4) is rotatably mounted, which bearing body (5) has perforations (8, 8.1) communicating with the fluid passage (7) in an open position of the closure body (6), an outer surface of the bearing body (5) being frustoconical and the bearing body (5) acts with an inner surface in a fluid-tight manner against the closure body (6). A method for configuring a medical instrument, which instrument (1) comprises a fluid conduit (20) which can flow through a fluid channel (2, 2.1) and into which a tap driver seat (3) is inserted, a tap driver unit (4) being provided which has a closure body (6) with a fluid passage (7) crossing this and a sleeve-like bearing body (5) in which the closure body (6) of the hammer unit (4) is rotatably mounted, which bearing body (5) has an inner surface fluid-tight against the closure body ( 6) acts and which has openings (8, 8.1) communicating with the fluid passage (7) in an open position of the closure body (6), and the tap driver unit (4) with an outer surface of the bearing body (5) in such a fluid-tight manner into the Tap driver seat (3) is used that the openings (8, 8.1) of the bearing body (5) communicate with the fluid channel (2, 2.1).

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