WO2010048649A1

WO2010048649A1 - Guide sleeve for a medical instrument having a self-closing valve

Info

Publication number: WO2010048649A1
Application number: PCT/AT2009/000411
Authority: WO
Inventors: Walter Milacek; Christian Sabeff
Original assignee: Allomed Medizintechnik Gmbh
Priority date: 2008-10-28
Filing date: 2009-10-20
Publication date: 2010-05-06
Also published as: AT507502A1; AT507502B1

Abstract

The invention relates to a self-closing medical closing element (1) having a housing (2) and a closure body (3) which can be adjusted between an open position and a closed position, wherein the housing (2) and the closure body (3) in the open position expose an aperture (4) for an insertion element (5), in particular a hollow or Verres needle (10) or a guide wire. In the closed position, with the insertion element (5) being removed, the aperture (4) through the closure body (3) is interrupted. The closure body (3) is mounted in a chamber (7) on the inside of the housing (2) so as to move substantially transversely to the longitudinal axis of the aperture (4) and is held in the open position thereof by the insertion element (5) and is pretensioned by a tensioning element (6) in the closing direction.

Description

GUIDE SLEEVE FOR MEDICAL INSTRUMENT WITH SELF-LOCKING VALVE

The present invention relates to a self-closing medical closure member having a housing and an adjustable between an open position and a closed position closure body, wherein the housing and the closure body in the open position a passage for a male element, in particular a Hohloder Verres needle or a guide wire release , and wherein in the closed position with the insertion element removed, the passage through the closure body is interrupted. Furthermore, the invention relates to a method for producing a self-closing medical closure member.

Closure organs of the type mentioned above are used in particular in catheters with flexible catheter shaft, in which for setting the catheter, a guide element, such as a hollow or Verresnadel or a guide wire is used, the guide element is removed once the catheter in his right Position was used. Such catheters may be used, for example, to remove air or body fluids from the human body by means of a puncture; however, they may equally be used in the veterinary field, the present description particularly referring to its use in human medicine. On the one hand, the closing organ must prevent the entry of pathogens, on the other hand it must prevent the uncontrolled escape of body fluids or the ingress of air and satisfy high qualitative standards, since a failure of the closing organ can lead to serious complications for the patient.

In particular, in the treatment of pathological fluid or gas collections in the pleural space (pleural) by means of a pleural function catheter, a faulty closing organ can quickly lead to acute complaints, such as a life-threatening pneumothorax. Pleural space is the area between the lung and the pleura, which in healthy people is airless and liquid-empty, with a negative pressure normally prevailing in this gap. The Lung tissue is surrounded by the lung pelt like a mantle. At the same time, the pleura rests on the inside of the ribs.

The pleural function is usually performed by an experienced physician under local anesthesia of the patient by inserting a cannula (or a puncture catheter) into the space between the pleura and the pleura (pleural space), possibly assisted by imaging techniques such as X-rays or ultrasound. On the one hand, the puncture can be used to obtain examination material (diagnostic application), on the other hand, the fluid collections can be aspirated (therapeutic application). Usually, a cannula or hollow needle wrapped in a plastic tube is used, which is inserted between two ribs through the skin and the intercostal musculature into the pleural cavity. A syringe attached to the cannula can be used to aspirate some pleural effusion and place it in a laboratory for further examination. Thereafter, the hollow needle is pulled out and to the remaining plastic tube, a hose is connected, through which the effusion is derived. As connecting elements mostly so-called Luer connections or Luer locks are used, since these are used internationally, and a uniformly standardized (for example in the DIN 13090, the EN 1707 or the ISO 594/1) connection of different medical devices allow.

The aspiration can either be via a syringe, or by special vacuum or pumping systems, which are connected to the catheter and in particular serve the removal of larger amounts of liquid or gas. In some cases, it may be appropriate to introduce medications into the pleural space via the catheter, for example a local anesthetic, an antibiotic, a tissue adhesive, a cell killing agent (cytostatic) or painkillers. To remove the catheter, at the end of the treatment, the catheter plastic tube is withdrawn and a bandage applied.

In conventional catheters, a different device often has to be connected to the catheter between individual work steps, whereby it must always be ensured that no air can penetrate into the pleural space, as this could quickly lead to a pneumothorax (gas chest). Serve various shut-off valves, their proper operation is the responsibility of the doctor. In addition to the operation of the facilities, the doctor must also give the patient instructions, such as when he can hold the air, or may or may inhale or inhale. Errors are thus avoided only by the professional competence and the prudence of the doctor, since the devices used do not prevent incorrect operation.

Infections can occur as possible complications when placing a pleural catheter, but this is rare with a sterile needle and good skin disinfection. In addition, it is possible that when the catheter is inserted, or when the patient is moving or coughing, the lung is injured. Also injuries of liver or spleen as well

Bleeding may occur.

For example, in order to prevent injury to the lung and internal organs, special puncturing needles known in the art may be used, which are known in the art for a long time an injured person of soft material (lung skin, lung tissue) .For this purpose, a Verresnadel consists of an outer needle with a sharp distal end (similar to a cannula), in whose lumen extends an inner probe having a blunt probe tip Spring is biased forward so that its blunt probe tip protrudes beyond the tip of the outer needle When piercing a relatively firm tissue, such as the chest muscles, the probe tip is pushed back against the spring force into the outer needle, exposing the sharp end of the outer needle, and like a normal cannula can penetrate into the tissue. As the needle tip penetrates softer tissue, the probe tip pushes out of the outer needle again, forcing the softer tissue away from the tip of the outer needle so that it does not damage the tissue. In order to use the Verresnadel like a conventional cannula, the probe is hollow, with the distal opening is not provided at the top, but laterally therefrom. The use of a Verresnadel in a medical instrument for a Pleurapunktion is described for example in DE 693 28 254.

DE 693 28 254 discloses a ball valve provided on a catheter inlet, in which, as soon as the needle Verresnadel is pulled out of the catheter, a locking ball closes the needle inlet or the closing member of the pleural function catheter to prevent the ingress of air into the Pleuraraum. In this case, the blocking ball, which was previously urged by the needle in the valve chamber to the edge, from a parallel to the needle displaceable, biased towards the distal, conical chamber end biased biasing device in the conical chamber outlet depressed as soon as the needle releases this. The head of the catheter has a branch from which a tube leads to a suction unit. Even with a transparent housing, it is hardly recognizable from the outside whether the small blocking ball has assumed its correct position after pulling out the needle. This is disadvantageous because even a slight positional error of the ball, such as when the ball is jammed laterally, could lead to unrecognized leakage of the valve, so that the safety of the valve does not seem guaranteed. Even the small sealing surfaces of the ball, which basically consist of only two small circular areas, can be feared that the small locking ball is not able to adequately seal the valve. Increasingly, non-return valves made of an elastic material such as rubber or other elastomer are being used in the medical field recently. These valves consist of a generally one-piece body, which usually has an inwardly hollow, substantially cylindrical shape, and wedge-shaped converges on one side, so that at the wedge tip of the inner cavity is closed by two adjoining sealing lips. These valves are commonly referred to as lip valves, or due to their shape as (duck) beak valves. Because of their simple construction, such valves are available in many designs, wherein the tip does not always have to be wedge-shaped, but may also be tapered or cross-shaped (similar to the shape of a Phillips screwdriver) in some models. Applicant's attempts to use beak valves as a catheter terminator have, however, led to the realization that the required operational reliability can not be guaranteed with such valves alone, since the valve would have to reliably block the passage in both directions after removal of the needle, and beak valves only provide a high clamping force in one direction. Also, the elastomeric material used for beak valves tends to deform permanently when the guide needle remains in the valve for a long time, as is the case with catheters already provided with an inserted guide needle in the factory.

It is the object of the invention to provide a self-closing closure member of the type mentioned, which overcomes the disadvantages of the prior art. The closure member should close the catheter end safely, tightly and sterile after pulling out the insertion element, regardless of whether the insert element has been inserted into the valve a long time ago, ie, for example, during the production of the valve, or just recently. These and other objects of the invention are achieved by the Closure body in a chamber in the interior of the housing substantially transverse to

Slidably mounted longitudinal axis of the passage and held by the insert member in its open position and is biased by a clamping element in the closing direction.

The sealing effect of the closure element can be increased by the inner wall of the chamber and the outer shell of the closure body at least in

Region of the passage are formed conically mating, wherein the cone of the

Closure body is pressed in the closed position by the clamping element in the cone of the chamber. In the closed position, the wedge effect increases the contact pressure on the

Sealing surfaces and thus improves the seal. This embodiment also improves operational safety, as in the open position of the outer jacket of the

Closure body is spaced from the inner wall of the chamber, so that a

Jamming of the closure body is prevented.

In a further advantageous embodiment, on the inner wall of the

Chamber and on the outer surface of the closure body on at least one side of the chamber or the closure body parallel opposite, the Durchläse crossing, level

Be provided sealing surfaces.

It may be advantageous if the parallel sealing surfaces are pressed in a wedge-like manner in the closed position by the clamping element. This increases the contact pressure of the

Sealing surfaces and thus the sealing effect. In an advantageous manner, at least one can be provided on at least one sealing surface

Be provided sealing element.

In order to increase operating safety, in the closed position, the inlet for the insertion element can open into a blind bore provided in the closure body.

As a result, it is no longer possible to move the closure body from the inlet opening, such as with a needle or a wire, into the open position as soon as the

Closure body, after pulling out of the insertion element, has taken its closed position.

Advantageously, the tensioning element may be a compression spring which is clamped between a housing cover closing off the chamber and the closure body. Compression springs are particularly inexpensive available; moreover, this allows

Embodiment of a very simple assembly by the compression spring is inserted in the unloaded state on the closure body in the chamber, and the housing cover during

Closing the chamber biases the spring at the same time. In the assembly, the Insertion element are already introduced before the clamping of the clamping element in the passage formed by the housing and closure body. The closure organ may then be packaged in a sterile condition with the medical instrument with which it is used and then removed from the package ready for use by the physician. As soon as the insertion element is pulled out of the closure member, the closure member automatically closes the passage, wherein it is preferably no longer possible to release the blocking by reinserting the insertion element after "snapping" the closure body.

However, should a later opening of the closure element be desired, a further embodiment according to the invention can provide for a restoring element for the closure body, which is pressed against the force direction of the tension element from the outside, to be inserted into the closure element. Such a return element is also required if the closure member is not provided with a previously inserted insert body, but this should be used immediately before use. The invention further relates to a medical device in the form of a catheter for

Supplying or discharging fluid into or out of body cavities, wherein the catheter has at the proximal end of one of the closure organs set out above with an inlet leading into the passage of the closure member for an insertion element, in particular as a hollow or Verres needle a lockable branch connection is provided in the region between the closure member and the area of the catheter shaft intended to be introduced into the body. The closure member is used in this medical device according to the invention as an inlet for the insertion element, which is mainly used as a guide to the setting of the catheter, and is removed after setting out of the catheter. The actual catheter lumen used then passes over the branch port. The branch connection can, for example, in an advantageous embodiment of the invention lead to a suction pump unit, is sucked with the body secretions. If the closure member has a reset device, it may also be used after pulling out the guide aid, such as for injecting. However, for some catheters, especially catheters for a pleural function, it may be indicated for safety reasons, once the closure member, once it has taken the closed position, can not be opened. In an advantageous manner, the insert element can be inserted from the factory into the closure member. In a method according to the invention for producing a self-closing medical closure element, a push-in element is arranged in a closure body arranged through a housing and through a closure body arranged in a chamber of the housing, or aligned passage passing therethrough, and then the chamber is closed with a housing cover, wherein between the closure body and the housing cover provided clamping element during attachment or closing of the housing cover is biased under load of the closure body in its closing direction.

In an advantageous manner, the chamber can be closed by the housing cover with a fixed engagement.

The invention will now be described in detail with reference to the accompanying drawings. Show it

1 is a sectional view of a first embodiment of a shut-off device according to the invention in the open position with an inserted insertion element, Fig. 2 is a sectional view of the same obturator according to the invention in the

Closed position,

3 is a perspective view of a pleural function catheter set according to the invention with a Verres needle inserted into the catheter and a pump device tee connected to the branch connection. FIG. 4 is a sectional view of a second embodiment of the invention

Obturator in the open position,

5 is a sectional view of the same obturator according to the invention in the closed position,

6 is a sectional view of a third embodiment of the obturator according to the invention in the open position,

7 is a sectional view of the same obturator according to the invention in the closed position,

Fig. 8 is a perspective view of a fourth embodiment of the obturator according to the invention, and Fig. 9 is a perspective view of a fifth embodiment of the obturator according to the invention with an elongated closure body, which also serves as a return element. A first embodiment of the invention will now be described with reference to FIGS. 1 and 2. The figures show an inventive closure member 1, which consists of a housing 2, a closure body 3, a clamping element 6 and a housing cover 8. The closure body 3 is arranged in the housing 2 in a chamber 7, wherein the inner wall of the chamber 7 has a matching to the shape of the closure body 3 conical shape. The closure member 1, in the illustrated in Fig. 1, open position transversely to the chamber 7 of the housing 2 on a passage 4, which is penetrated by an insertion element 5. The passage 4 consists of three sections, one provided on the housing 2 inlet 9 on one side of the chamber 7, an inlet 9 opposite the outlet 20 and a through hole 19 in the closure body 3. The inner wall of the inlet 9 is preferably in accordance with the known standards for Luer connector conical.

The upper, open end of the chamber 7 is closed by a cap-shaped housing cover 8, which is fastened by means of a snap closure 21 on the housing. The snap closure 21 represents a particularly advantageous embodiment, but the housing cover 8 could also be attached to the housing 2 in any other way, such as by means of a screw or bayonet closure, an adhesive or weld, a press fit or any other known manner. The upper end of the closure body 3 projects out of the chamber 7 into a cavity 22 formed by the cap shape of the housing cover 8, which extends the chamber 7 upwards. The term "top" or "bottom" refers exclusively to the orientation shown in the figure, the closure member 1, however, is functional in any orientation, regardless of gravity. Between the housing cover 8 and the closure body 3, a clamping element 6 is clamped. The clamping element 6 shown is a simple helical compression spring, but it can also be used other elastic elements for this purpose. The clamping element 6 loads the closure body 3 downwards in the direction of the chamber 7, so that the closure body 3 is held only by the insertion element 5 in its position. As soon as the insertion element 5 is pulled out of the closure member 1, the clamping element 6 presses the closure body 3 deeper into the chamber 7, so that the closure body 3 assumes the closed position shown in FIG.

The closure body 3 can be secured in the chamber 7 against rotation, for instance by a guide groove or by a lateral flattening which cooperates with a corresponding guide surface provided on the outer wall of the chamber. However, this is not absolutely necessary, since the closure body 3 is held by the insertion element 5 in the open position after assembly and is secured by this against rotation. After pulling out of the insertion element 5, when the closure body 3 has taken its closed position, it may not be possible in many cases for security reasons, the starting position - ie the open position with intact passage 4 - restore. It is therefore irrelevant whether the closure body 3 is rotated when taking the closed position relative to the open position, so that in embodiments which have no reset option, can be dispensed with an anti-rotation. Due to the conical shape of the closure body 3 (and the corresponding conical shape of the chamber 7) is in the open position (Fig. 1) between the closure body 3 and the inner wall of the chamber 7, a small gap 23 whose width of the stroke of the closure body. 3 and is dependent on the angle of the cone. This gap 23 ensures that the closure body 3 is sufficiently guided in the open position in the chamber 7, and after pulling out of the insertion element 5 is reliably pressed into the closed position. The conical shape has the further advantage that the outer cone of the closure body 3 is pressed firmly into the inner cone of the chamber 7 by the clamping element 6 in the closed position (FIG. 2) and thus a reliable sealing is ensured. As can be seen in Fig. 2, the closure body 3 is not in the closed position at the bottom of the chamber 7, but is held by the inner cone of the chamber 7 positively.

The closure member 1 described above can be relatively easily produced in series. It is preferably already provided from the factory with an inserted insertion element 5 and can get such a prefabricated sterile packed in the trade. The housing 2, the closure body 3 and the housing cover 8 can be produced as inexpensive injection-molded parts, which is particularly advantageous for disposable articles. The assembly of the closure member 1 can be done automatically under sterile conditions or possibly also done by hand.

During assembly, the closure body 3 is first inserted into the chamber 7 and the axis of the through-hole 19 is aligned with the axis of the inlet 9 and the outlet 20, respectively. Through the passage 4 thus created, the insertion element 5 can now be introduced. It would also be possible to make the closure body 3 not with a through hole 19 but with a through groove at the bottom of the closure body or to use a closure body, which - like a simple stubble - has no passage, such a closure body with its bottom (or With the passageway groove) would be pressed against the insertion element. Such a closure body would make it possible first to insert the insertion element into the passage provided in the housing, and then first to introduce the closure body into the chamber. Such an embodiment is shown without being shown for the sake of completeness.

Depending on the intended use, the insertion element 5 may be a hollow or Verresnadel, a cannula, a Führungsdrat, an optical conductor or the like. After the insertion element 5 and the closure body 3 have been arranged in the housing, the clamping element 6 in the housing cover 8 (or on the closure body 3) is arranged, the housing cover 8 is placed on the housing 2 and closed by means of the snap closure 21 with a fixed engagement. In this case, the clamping element 6 is compressed and biased so that the closure body 3 is biased in the closing direction, but is held by the insertion element 5 in its open position. The housing 2 may be connected to the medical instrument with which it is to be used before or after assembly of the closure member 1. It can also be advantageous if the closure member with the insertion element 5 inserted therein is only inserted by the attending physician into the medical instrument with which it is used until immediately before the procedure. For this purpose, a Luer connector, or another suitable connecting element may be provided on the housing 2 in the region of the output 20.

The closure member 1 can be already connected ex works with a prepared for an intervention catheter, in particular with a pleural function catheter, as it comes in a pleural drainage for use. An exemplary embodiment of a pleural function catheter according to the invention, which uses such a closure member 1 is shown in Fig. 3.

The catheter 12 according to FIG. 3 consists essentially of a catheter shaft 13 and a catheter head 24. Provided on the catheter head 24 are an inlet 9, a closure member 1, a manually operable plug cock 25 and a branch connection 14. At the branch connection 14, a suction pump unit 15 is connected via a connecting hose 26. The closure member 1 corresponds to that shown in FIGS. 1 and 2 Closing member 1 according to the invention. The straight lumen of the catheter running from the inlet 9 through the closure member 1, the plug cock 25 and the catheter shaft 13 to the distal end of the catheter shaft 13 is penetrated by a Verres needle 10, the Verres needle 10 being simultaneously inserted for the Closing member 1 serves as a push-in element and holds the closure body 3 in the open position.

The arrangement shown may be sterile packed from the factory and provided to the attending physician as a completed pleural function kit. After the patient has been prepared, the doctor uses the prepared catheter and performs the pleural function using the Verres needle 10. Once the catheter shaft is placed in the correct position, which can be monitored by imaging, the physician retracts the Verres needle 10 in the catheter to behind the plug cock 25 and closes it by hand. Then, the Verres needle 10 is completely pulled out of the catheter, wherein the closure body 3 is released in the closing member 1 and pressed by the clamping element 6 in the locked position. It is not absolutely necessary to provide a separate plug cock 25, since even the closure member 1 alone reliably closes the catheter inlet. However, due to the high risk that a pleural function is based on a faulty sealing of the catheter inlet, it is also preferred to allow this manual barrier as double security. The actual lumen leading to the body cavity, which is responsible for the

In the embodiment illustrated in FIG. 3, the branch connection 14 leads, for example via a connecting tube 26, to a suction pump unit 15 likewise developed by the applicant of the present invention, FIG. the training and functioning of which is described in the Austrian patent application A361 / 08 filed on 5.3.2008.

The trained as T-piece suction pump unit 15 consists essentially of a stem portion 52 and a cross member 53. In the stem portion 52, a suction valve 54 is included, wherein the stem portion 52 is connected via the line 26 to the catheter. The suction valve 54 allows flow in the direction away from the catheter. The cross member 53 of the T-piece has in the branch 55 a connection 56 for a secretion bag and the terminal 56 opposite a port 57 for a syringe. In the branch 55 of the T-piece is still a check valve 58, which has a flow to the terminal 56 of the secretion bag allows. If a negative pressure is generated in the T-piece via a syringe attached to the connection 57, the medium to be aspirated from the body cavity via the catheter is sucked into the syringe via the line 26, the suction valve 54, the stem part 52 and the branch 59 of the T-piece , The check valve 58 prevents already located in the secretion bag medium penetrates back into the suction pump unit 15. Thereafter, the syringe is used to apply pressure to the medium in the syringe so that it is displaced from the syringe into the transverse part 53 of the T-piece and via the check valve 58 into the secretion bag attached to the connection 56. In this case, the suction valve 54 prevents the medium from getting back into the catheter and, if appropriate, even into the body cavity. However, the branch port 14 of the catheter 12 may also lead to any other device, as long as it is suitable for use with a catheter. Also, as needed, additional safety devices may be provided, for example, the connecting tube 26 may have another safety valve or be provided with a simple squeeze as commonly used in the clinical field.

FIGS. 4 and 5 show a further embodiment of a closure member 101 according to the invention. FIG. 4 shows the closure member 101 in an open position and FIG. 5 shows the same closure member 101 in a closed position. The closure member 101 differs from the closure member 1 of Figs. 1 and 2 in that the closure body 103, and the chamber 107 are at least substantially cylindrical. The housing 102, the housing cover 108 and the clamping element 106 differ in their design and operation only insignificantly from the corresponding components of the first embodiment, so they will not be described again in detail. Due to the straight course of the cross section of the closure body 103 and the chamber 107 of the closure body 103 is thereby held in the closed position that it rests against the housing bottom 126. The housing bottom 126 serves in this case the closure body 103 as a stop, which limits the movement of the closure body 103 downwards. Despite the stop, this embodiment could also have an at least minimal conical shape, which would be advantageous for the sealing effect. Above the Durchgangssbolirung 119, parallel to this blind bore 118 in

Closure body 103 is provided, which is introduced at the side of the inlet 109 in the closure body 103, and this does not completely penetrate. The term "blind hole" in this context means a bore along its bore axis the Closure body does not penetrate completely. It is irrelevant whether this blind bore 118 has a side wall and a bottom, that is, "drilled into the full", or, as in the present case, opens into an upwardly open cavity As a result, it is completely impossible to move the closure body 103 out of its closed position with a needle tip, for example, if an attempt is made inadvertently to insert a needle or cannula into the closure member 101. that the blind bore 118 is correctly aligned with the inlet 109 in the closed position, the closure body 103 is prevented from rotating be provided with one in the Chamber 107 arranged guide spring is engaged. Such anti-rotation devices are state of the art and are therefore not shown in the drawings for the sake of clarity.

6 and 7 show a further embodiment of a closure member 201 according to the invention. In contrast to the closure member 101 of FIGS. 4 and 5, the chamber of the closure member 201 of FIGS. 6 and 7 is open at the bottom and the closure member 203 is toward this case bottom opening 226 clearly extended so that the through hole 219 is located approximately halfway up the closure body 203. In the closed position (FIG. 7), therefore, the extended lower section of the closure body 203 protrudes beyond the housing base opening 226, so that the extended part of the closure body 203 serves as a restoring element 211. By the return element 211 is pressed against the force of the clamping element 206 in the housing, the closure body 203 can be brought back into the open position. As a result, the closure member 201 is reusable. In order to prevent the closure body 203 protrudes too far from the housing bottom opening 226, or even falls out of the housing 202, the rotation (not shown) with any stop according to the prior art provided (not shown), the closed position of Closure body 203 defined. This embodiment is particularly suitable for applications of a closure member according to the invention, in which the safety precautions allow reuse of the closure member. A further embodiment of the closure element according to the invention is shown in FIG. 8. The closure body 303 of the closure member 301 has a substantially cylindrical shape, wherein on the output 320 of the housing 302 facing side of the closure body 303, a flat sealing surface 3316, 416 is provided. The inner wall of the housing chamber corresponds substantially to the shape of the closure body 303 and also has sealing surfaces, wherein the opposite sealing surfaces of closure body 303 and housing 302 are not tightly abut each other even in the closed position shown in Fig. 8, since at the sealing surfaces 3316, 416 of Sealing body 303 acting on the sealing surface of the housing 302 sealing elements 317, 317 'are provided, which in the open position (not shown), the through hole 319 and the output 320 relative to the chamber 307, and in the closed position the sealed from the sealing surface output 320 against Seal the chamber 307. The sealing elements 317, 317 'could be, for example, O-ring seals inserted in corresponding grooves provided in the sealing surface 3316, 416, however, due to the ease of manufacture, the sealing elements 317 are preferably as protruding from the sealing surfaces 3316, 416, formed with the closure body 303 integrally molded beads.

The sealing surface 3316, 416 is slightly inclined relative to the longitudinal axis of the closure body 303, so that in the closed position for the upper sealing element 317 'results in a higher contact pressure (and a better seal), as in the open position for the sealing element 317, 317' of Through hole 319. This is due to the fact that the seal must be ensured in the closed state more reliable than in the open position, in which an insertion element provides additional sealing of the outer wall of the catheter lumen. Alternatively, the sealing surface can also be arranged parallel to the longitudinal axis of the closure body 303, ie transversely to the axis of the through-bore 319. The positive guidance of the closure body 303 in the chamber 307 ensures that the closure body 303 is secured against rotation.

Depending on requirements, a sealing surface 3316, 416 may be provided on the closure body 303 either only on the side facing the outlet 320 or also on the opposite side facing the inlet 309. In addition, in this embodiment, as in the embodiments according to FIGS. 4 to 7, at the inlet 309 facing side, a blind bore (not shown) may be introduced, which is aligned in the closed position on the inlet 309.

9 shows a further embodiment of the closure member according to the invention. As in the case of the embodiment of FIG. 8, in this closure member 401, an extended part of the closure body 403 forms a restoring element 411, which projects out of the housing 402 through a housing bottom opening 426. By the return element 411 is pressed against the spring force of the clamping element 406 in the chamber 407, the closure member 401 can be brought back into its open position. In order to secure the closure body 403 from falling out of the chamber 407, a stop 427 is provided at the upper edge of the closure body, above the sealing surface 4316, 416, which in the closed position on a correspondingly shaped counter-stop above the sealing surface provided in the chamber 407 is applied.

The embodiments of the further elements of the closure member 401 essentially correspond to those of the closure member 301 according to FIG. 8.

Claims

claims

1. Self-closing medical closure member (1) with a housing (2) and an adjustable between an open position and a closed position closure body (3), wherein the housing (2) and the closure body (3) in the open position, a passage (4) for a push-in element (5), in particular a hollow or Verres needle (10) or a guide wire, release, and wherein in the closed position with removed insertion element (5) of the aperture (4) is interrupted by the closure body (3), characterized in that the closure body (3) is displaceably mounted in a chamber (7) in the interior of the housing (2) substantially transversely to the longitudinal axis of the passage (4) and held by the insertion element (5) in its open position and by a tensioning element (5). 6) is biased in the closing direction.

2. Closing member (1) according to claim 1, characterized in that the inner wall of the chamber (7) and the outer casing of the closure body (3) at least in the region of the passage (4) are formed conically mating, wherein the cone of the closure body (3) in the closed position by the clamping element (6) is pressed into the cone of the chamber (7).

3. Closing member (1) according to spoke 1, characterized in that on the inner wall of the chamber (7) and on the outer surface of the closure body (3) on at least one side of the chamber (7) and the closure body (3) parallel opposite, the Passage (4) transverse, flat sealing surfaces (316, 416) are provided.

4. closing member (1) according to claim 3, characterized in that the parallel sealing surfaces (316, 416) in the closed position of the clamping element (6) are pressed together like a wedge.

5. closure member (1) according to claim 3 or 4, characterized in that at least one sealing surface (316, 416) at least one sealing element (317, 317 ') is provided.

6. closing element (1) according to one of the preceding claims, characterized in that in the closed position, the inlet for the insertion element (5) in a closure body (3) provided in the blind bore (118) opens.

7. closure member (1) according to any one of the preceding claims, characterized in that the clamping element (6) is a compression spring which is clamped between a chamber-closing the housing cover (8) and the closure body (3).

8. closing element (1) according to any one of the preceding claims, characterized in that in the closure member (1) from the outside against the force direction of the clamping element (6) pushing return element (211, 411) for the closure body (3) can be inserted.

9. Medical device in the form of a catheter (12) for supplying or discharging fluid in or from body cavities, characterized in that the catheter (12) at the proximal end of a closure member (1) according to one of claims 1 to 8 with a in the passage (4) of the end member (1) leading inlet (9) for a particular Hohloer Verres needle (10) formed insert member (5), wherein in the region between the closure member (1) and the insertion provided in the body region of the catheter shaft (13) a lockable branch connection (14) is provided.

10. Medical device according to claim 9, characterized in that the branch connection (14) leads to a suction pump unit (15).

11. Medical device according to claim 9 or 10, characterized in that the insertion element (5) from the factory in the closure member (1) is inserted.

12. A method for producing a self-closing medical closure member (1), characterized in that an insertion element (5) in a through a housing (2) and through a in a chamber (7) of the housing (2) arranged closure body (3) through, or is arranged at this passing aligned passage (4), and then the chamber (7) with a Housing cover (8) is closed, wherein between the closure body (3) and the housing cover (8) provided clamping element (6) during attachment or closing of the housing cover (8) under load of the closure body (3) is biased in its closing direction.

13. The method according to claim 12, characterized in that the chamber (7) from the housing cover (8) is closed with a fixed engagement.