Flexible ureteroscope guide sheath with water inflowing at tail end

Abstract

The flexible ureteroscope guiding sheath comprises a sheath tube connector, and the interior of the sheath tube connector is connected with an inner sheath in a sliding mode. The utility model provides a flexible ureteroscope guide sheath with water inflowing at the tail end, and solves the problems that in the prior art, a doctor can only evaluate the actual condition of a patient and select a negative pressure suction sheath with a proper specification before an operation, but the selection mode can be influenced by the difference of the patient, and the operation difficulty is high. Due to factors such as the position of calculus, the obesity degree of a patient and the complex condition in the renal calyx, the suction sheath with the right appropriate length cannot be accurately selected, suction sheaths with different lengths need to be replaced according to the actual condition in the operation, and in the prior art, when the calculus is flushed out of the body, due to the fact that an outer sheath of a flexible ureteroscope is not provided with a water inlet hole, the operation is inconvenient. Incoming water can only flush the front end of the flexible ureteroscope, but the water entering the front end of the flexible ureteroscope possibly flushes stones back into a ureter or a renal pelvis, so that the stone removing efficiency is not high.

Description

Technical Field

[0001] The utility model belongs to the field of medical instruments, in particular to a ureteroscope guiding sheath with water inlet at the end. Background Art

[0002] Ureteroscopic lithotripsy is widely used to treat upper ureteral stones and kidney stones. During the operation, a ureteroscope guide sheath needs to be inserted under the guidance of a guide wire as a working channel to assist the soft endoscope to enter the surgical site. After ureteroscopic lithotripsy, the stones need to be clipped out or flushed out of the body. The difficulties in domestic and foreign literature reports and clinical practice are as follows:

[0003] 1. Clipping stones out of the body requires an additional stone basket, which increases the cost of surgical consumables and wastes limited medical resources.

[0004] 2. Flush the stones out of the body. Since the ureteroscope guide sheath has no water inlet, water can only enter from the front end of the ureteroscope. Water entering the front end of the ureteroscope may flush the stones back into the ureter or renal pelvis, resulting in low stone removal efficiency.

[0005] 3. Some patients have shorter ureters, and the ureteroscope guide sheath requires different length specifications.

[0006] In summary, considering the positive and negative conclusions of existing technical solutions, domestic and foreign literature reports on ureteroscopic surgery and other related factors, a ureteroscopic guide sheath with water filling at the end is needed. Utility Model Content

[0007] In view of the above problems existing in the prior art, the main purpose of the utility model is to provide a ureteroscope guide sheath with water inlet at the end.

[0008] The technical scheme of the utility model is as follows: a ureteroscope guide sheath with water inlet at the end, comprising a sheath tube joint, an inner sheath is slidably connected inside the sheath tube joint, one end of the inner sheath is fixedly connected to a slide plate inside the sheath tube joint, a first spring is arranged outside the inner sheath and between the slide plate and the inner wall of the sheath tube joint, an adjustment mechanism is arranged on the top of the sheath tube joint, both sides of the inner wall of the inner sheath are slidably connected with leads, one end of the lead extends to the inside of the sheath tube joint and is slidably connected to the inner wall of the sheath tube joint, one end of the lead is fixedly connected to a connecting rod, one end of the connecting rod extends to the outside of the sheath tube joint and is fixedly connected to a push plate, a liquid inlet is fixedly connected to the side of the outside of the sheath tube joint away from the push plate, an outer sheath is arranged on the outside of the sheath tube joint, a flushing head is fixedly connected to the outer end of the outer sheath, flushing ports matching the liquid inlet are equidistantly provided inside the flushing head, and the liquid inlet and the flushing port are connected to the flow groove opened inside the outer sheath through an ultra-fine hose or a sheath tube joint.

[0009] As a preferred embodiment, the adjusting mechanism includes a fixed block, which is fixedly connected to the top of the slide plate and extends to the outside of the sheath tube connector, and the fixed block is slidably connected to the inner wall of the sheath tube connector, a slider is slidably connected to the lower part of the interior of the fixed block, and a clamping block is fixedly connected to the outside of the slider on one side of the outer side of the slider, and clamping grooves matching the clamping block are equidistantly provided on one side of the inner wall of the sheath tube connector, a second spring is provided on the side of the interior of the fixed block close to the slider, an oblique groove is provided on the interior of the slider, a pressing block is slidably connected to the top of the fixed block, and the bottom of the pressing block extends to the inside of the slider and is fixedly connected to a sliding rod matching the oblique groove, and a third spring is provided between the bottom of the pressing block and the inner wall of the fixed block.

[0010] As a preferred embodiment, an outer sheath is fixedly connected to the outer side of the sheath tube connector and located outside the inner sheath, and the inner sheath is slidably connected to the outer sheath.

[0011] As a preferred embodiment, a pipette is fixedly connected to one side of the outside of the sheath tube joint close to the push plate, and limiting blocks are fixedly connected to both sides of the outside of the sheath tube joint close to the pipette, and a sealing plug is provided at one end of the outside of the sheath tube joint close to the limiting block.

[0012] As a preferred embodiment, the end of the lead wire away from the connecting rod is made of a bendable metal wire material, and the rest is made of a hard metal material; the end of the inner sheath away from the sheath tube connector is made of a pebax elastomer material, and the rest is made of a composite of nylon, Teflon and 304 stainless steel.

[0013] As a preferred embodiment, the push plate is provided with anti-slip bumps on the outside, and the outsides of the inner sheath and the outer sheath are coated with a hydrophilic coating.

[0014] As a preferred implementation, the sealing plug is made of silicone material, and the exterior of the sheath tube connector is provided with a knurled pattern.

[0015] As a preferred implementation, a cavity is provided inside the sheath tube connector on a side close to the sealing plug.

[0016] The beneficial effects of the utility model are as follows:

[0017] The device can adjust the extended length of the inner sheath, which can be shortened according to the patient's needs, so that the inner sheath can be closer to the target stone, avoiding the situation in which the inner sheath of different lengths needs to be replaced due to insufficient length of the inner sheath during the operation, thereby increasing the operation time and causing more discomfort to the patient. In addition, the device can bend and adjust the end of the inner sheath in the patient's body by pushing the push plate, so that the inner sheath can directly reach each renal calyx, and continue to suction with negative pressure while crushing the lithotripsy, effectively shortening the stone removal time, improving the stone clearance rate, and enhancing the clarity of the intraoperative field of view.

[0018] The above-mentioned records related to the content of the utility model are only an overview of the technical solution of the present application. In order to enable ordinary technicians in the field to more clearly understand the technical solution of the present application, and then implement it according to the text of the specification and the contents recorded in the drawings, and to make the above-mentioned purpose and other purposes, features and advantages of the present application easier to understand, the following is an explanation in combination with the specific implementation method and drawings of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings are only used to illustrate the principles, implementation methods, applications, characteristics and effects of the specific embodiments of the present application and other related contents, and shall not be considered as limitations of the present application.

[0020] In the drawings of the specification:

[0021] Figure 1 It is a three-dimensional structure of the utility model;

[0022] Figure 2 This is a first cross-sectional view of the sheath tube connector in the utility model;

[0023] Figure 3 It is a second cross-sectional view of the middle sheath pipe joint of the utility model;

[0024] Figure 4 It is a cross-sectional view of the inner sheath in the utility model;

[0025] Figure 5 It is a cross-sectional view of the middle fixing block of the utility model;

[0026] Figure 6 For the utility model Figure 1 Enlarged view of point A in the middle.

[0027] The reference numerals in the above drawings are described as follows:

[0028] 1. Sheath tube joint; 2. Inner sheath; 3. Slide plate; 4. First spring; 5. Fixed block; 6. Sliding block; 7. Block; 8. Slot; 9. Second spring; 10. Inclined groove; 11. Pressing block; 12. Sliding rod; 13. Third spring; 14. Lead wire; 15. Connecting rod; 16. Push plate; 17. Outer sheath; 18. Pipette; 19. Limiting block; 20. Sealing plug; 21. Liquid inlet; 22. Flushing port. DETAILED DESCRIPTION

[0029] In order to explain in detail the possible application scenarios, technical principles, specific schemes that can be implemented, and the purposes and effects that can be achieved, the following is a detailed description of the specific embodiments listed in conjunction with the accompanying drawings. The embodiments described herein are only used to more clearly illustrate the technical solutions of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0030] Reference to "embodiment" herein means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The term "embodiment" appearing in various places in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or association with other embodiments. In principle, in the present application, as long as there is no technical contradiction or conflict, the various technical features mentioned in the embodiments can be combined in any way to form a corresponding implementable technical solution.

[0031] Unless otherwise defined, the technical terms used in this document have the same meanings as those generally understood by those skilled in the art to which this application belongs; the use of relevant terms in this document is only for describing specific embodiments and is not intended to limit this application.

[0032] In the description of this application, the term "and / or" is an expression used to describe the logical relationship between objects, indicating that three relationships may exist, for example, X and / or Y, which means: X exists, Y exists, and X and Y exist at the same time. In addition, the character " / " in this article generally indicates that the objects before and after are in a logical relationship of "or".

[0033] In the present application, terms such as “first” and “second” are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship of quantity, priority or sequence between these entities or operations.

[0034] Without further limitations, in this application, the words "include", "comprises", "has" or other similar expressions used in the sentences are intended to cover non-exclusive inclusion. These expressions do not exclude the presence of additional elements in the process, method or product including the elements, so that the process, method or product including a series of elements may include not only those limited elements, but also other elements not explicitly listed, or also include elements inherent to such process, method or product.

[0035] Similar to the understanding in the Examination Guidelines, in this application, expressions such as "greater than", "less than", "exceed" and the like are understood to exclude the number itself; expressions such as "above", "below", "within" and the like are understood to include the number itself. In addition, in the description of the embodiments of this application, "multiple" means more than two (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups", "multiple times", etc., unless otherwise clearly and specifically limited.

[0036] In the description of the embodiments of the present application, space-related expressions used, such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "vertical", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or position relationship based on the orientation or position relationship shown in the specific embodiments or drawings, and are only for the convenience of describing the specific embodiments of the present application or facilitating the reader's understanding, and do not indicate or imply that the referred device or component must have a specific position, a specific orientation, or be constructed or operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0037] Unless otherwise expressly specified or limited, in the description of the embodiments of the present application, the terms such as "install", "connect", "connect", "fix", "set", etc. used should be understood in a broad sense. For example, the "connection" can be a fixed connection, a detachable connection, or an integrated setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For technicians in the technical field to which the present application belongs, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0038] See also Figure 1-6, a ureteroscope guide sheath with water inlet at the end, comprising a sheath joint 1, an inner sheath 2 is slidably connected inside the sheath joint 1, one end of the inner sheath 2 inside the sheath joint 1 is fixedly connected to a slide plate 3, a first spring 4 is arranged outside the inner sheath 2 and between the slide plate 3 and the inner wall of the sheath joint 1, an adjustment mechanism is arranged on the top of the sheath joint 1, both sides of the inner wall of the inner sheath 2 are slidably connected to lead wires 14, one end of the lead wire 14 extends to the inside of the sheath joint 1 and is slidably connected to the inner wall of the sheath joint 1, one end of the lead wire 14 is fixedly connected to a connecting rod 15, one end of the connecting rod 15 extends to the outside of the sheath joint 1 and is fixedly connected to a push plate 16, a liquid inlet 21 is fixedly connected to the side of the outer side of the sheath joint 1 away from the push plate 16, an outer side of the sheath joint 1 is provided with an outer sheath 17, one end of the outer side of the outer sheath 17 is fixedly connected to a flushing head, and flushing ports 22 matching the liquid inlet 21 are equidistantly provided inside the flushing head.

[0039] Specifically, the adjustment mechanism includes a fixed block 5, which is fixedly connected to the top of the slide plate 3 and extends to the outside of the sheath tube connector 1, and the fixed block 5 is slidably connected to the inner wall of the sheath tube connector 1, a slider 6 is slidably connected to the lower part of the interior of the fixed block 5, and a clamping block 7 is fixedly connected to the outside of the slider 6 on one side of the outer side of the slider 6. A clamping groove 8 matching the clamping block 7 is equidistantly provided on one side of the inner wall of the sheath tube connector 1, a second spring 9 is provided on the side of the interior of the fixed block 5 close to the slider 6, an inclined groove 10 is provided inside the slider 6, a pressing block 11 is slidably connected to the top of the fixed block 5, and a sliding rod 12 matching the inclined groove 10 is fixedly connected to the bottom of the pressing block 11 to extend to the inside of the slider 6, and a third spring 13 is provided between the bottom of the pressing block 11 and the inner wall of the fixed block 5.

[0040] Through the above technical solution, when it is necessary to adjust the extended length of the inner sheath 2, first press the slide bar 12 downward through the pressing block 11, so that the slide bar 12 pushes the inclined surface of the inclined groove 10, and drives the slider 6 to move toward the inner side of the fixed block 5, and at the same time squeezes the second spring 9 and the third spring 13 to deform the second spring 9 and the third spring 13. When the slider 6 drives the card block 7 to completely disengage from the card slot 8, the fixed block 5 can be pushed to one side, thereby arbitrarily adjusting the extended length of the inner sheath 2. When it is adjusted to a suitable position, release the pressing block 11, and The rebound force of the second spring 9 and the third spring 13 can drive the card block 7 to be stuck in the corresponding card slot 8, so as to complete the fixation of the fixing block 5, thereby achieving the purpose of adjusting the extended length of the inner sheath 2. When the inner sheath 2 is in the patient's body during use, the corresponding lead wire 14 can be driven to slide inside the sheath tube connector 1 by pushing the push plate 16, so that the bendable material at one end of the lead wire 14 drives one end of the inner sheath 2 to bend. The degree of bending depends on the distance of pushing the push plate 16. During the operation, the inner sheath 2 can cooperate with the holmium laser optical fiber to adjust the structure of the patient's body. The stone is crushed, and the stone fragments are sucked out through the negative pressure suction sheath. The stone fragments are discharged and collected through the sheath tube joint 1, and the blood is discharged through the suction tube 18. When it is necessary to rinse the medical endoscope lens, the internal part of the liquid inlet 21 is connected through the external water pipe, and then the cleaning liquid is injected into the internal part of the outer sheath 17 through the liquid inlet 21. The cleaning liquid is finally sprayed out through the flushing port 22, thereby achieving the purpose of flushing the medical endoscope lens, which can effectively reduce the contamination of the endoscope lens, keep the surgical field clear, and improve the safety and efficiency of the operation. The device can extend the inner sheath 2 The length can be adjusted, and can be shortened or lengthened according to the patient's needs, so that the inner sheath 2 can be closer to the target stone, avoiding the situation that the inner sheath 2 may be replaced with a different length due to the inner sheath 2 being insufficient during the operation, thereby increasing the operation time and causing more discomfort to the patient. In addition, the device can bend and adjust the end of the inner sheath 2 in the patient's body by pushing the push plate 16, so that the inner sheath 2 can directly reach each renal calyx, and continue to attract negative pressure while crushing the stone, effectively shortening the stone removal time, improving the stone clearance rate, and improving the clarity of the intraoperative field of view.

[0041] Specifically, an outer sheath 17 is fixedly connected to the outer side of the sheath connector 1 and located outside the inner sheath 2, the inner sheath 2 is slidably connected to the outer sheath 17, a pipette 18 is fixedly connected to the outer side of the sheath connector 1 near the push plate 16, both sides of the outer side of the sheath connector 1 near the pipette 18 are fixedly connected to limiting blocks 19, and a sealing plug 20 is provided at one end of the outer side of the sheath connector 1 near the limiting block 19.

[0042] Through the above technical solution, the setting of the limiting block 19 can facilitate the sealing plug 20 to be clamped when installing the sealing plug 20 to prevent it from falling off.

[0043] Specifically, one end of the lead wire 14 away from the connecting rod 15 is made of a bendable metal wire material, and the rest is made of a hard metal material; one end of the inner sheath 2 away from the sheath tube connector 1 is made of a pebax elastomer material, and the rest is made of a composite of nylon, Teflon and 304 stainless steel.

[0044] Through the above technical solution, the bendable metal wire material is provided in combination with the pebax elastomer material, so that the inner sheath 2 can be easily bent in combination with the lead wire 14 whose one end is made of the bendable metal wire material.

[0045] Specifically, the outside of the push plate 16 is provided with anti-slip bumps, the outside of the inner sheath 2 and the outer sheath 17 are coated with a hydrophilic coating, the sealing plug 20 is made of silicone material, the outside of the sheath tube connector 1 is provided with a knurled pattern, and a cavity is opened on the inside of the sheath tube connector 1 near the sealing plug 20.

[0046] Through the above technical solution, the hydrophilic coating provided helps the inner sheath 2 to better integrate with the patient's internal environment when entering the patient's body, thereby reducing the patient's discomfort.

[0047] When in use, when it is necessary to adjust the extended length of the inner sheath 2, first press the sliding bar 12 downward by the pressing block 11, so that the sliding bar 12 pushes the inclined surface of the inclined groove 10 and drives the sliding block 6 to move toward the inner side of the fixing block 5, and at the same time squeezes the second spring 9 and the third spring 13, so that the second spring 9 and the third spring 13 are deformed. When the sliding block 6 drives the card block 7 to completely disengage from the card slot 8, the fixing block 5 can be pushed to one side to move, thereby adjusting the extended length of the inner sheath 2 at will. When it is adjusted to a suitable position, release the pressing block 11, and the card block 7 can be driven to snap into the corresponding card slot 8 under the rebound force of the second spring 9 and the third spring 13, so that the fixing of the fixing block 5 can be completed, thereby achieving the purpose of adjusting the extended length of the inner sheath 2. When the inner sheath 2 is in the patient's body during use, the corresponding lead wire 14 can be driven to slide inside the sheath tube connector 1 by pushing the push plate 16, so that one end of the inner sheath 2 is driven to bend through the bendable material at one end of the lead wire 14. The degree depends on the distance that the push plate 16 is pushed. During the operation, the inner sheath 2 can be used in conjunction with the holmium laser optical fiber to crush the stones in the patient's body, and the stone fragments can be sucked out through the negative pressure suction sheath. The stone fragments are discharged and collected through the sheath tube connector 1, and the blood is discharged through the suction tube 18. When the medical endoscope lens needs to be flushed, the internal part of the liquid inlet 21 is connected through an external water pipe, and then the cleaning liquid is injected into the internal part of the outer sheath 17 through the liquid inlet 21. The cleaning liquid is finally sprayed out through the flushing port 22, thereby achieving the purpose of flushing the medical endoscope lens, which can effectively reduce the contamination of the endoscope lens, keep the surgical field clear, and improve the safety and efficiency of the operation. The limit block 19 set can facilitate the sealing plug 20 to be clamped when installing it to prevent it from falling off. The flexible metal wire material set in conjunction with the pebax elastomer material can facilitate the bending of the inner sheath 2. The hydrophilic coating set helps the inner sheath 2 to better integrate with the patient's internal environment when entering the patient's body, thereby reducing the patient's discomfort.

[0048] Those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present application and form different embodiments. For example, in the claims, any one of the claimed embodiments may be used in any combination.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A flexible ureteroscope guide sheath with water inlet at the end, comprising a sheath tube connector (1), characterized in that: The inner part of the sheath tube joint (1) is slidably connected to an inner sheath (2), one end of the inner sheath (2) located inside the sheath tube joint (1) is fixedly connected to a slide plate (3), a first spring (4) is arranged outside the inner sheath (2) and between the slide plate (3) and the inner wall of the sheath tube joint (1), an adjustment mechanism is arranged on the top of the sheath tube joint (1), both sides of the inner wall of the inner sheath (2) are slidably connected to a lead wire (14), one end of the lead wire (14) extends to the inside of the sheath tube joint (1) and is in contact with the inner wall of the sheath tube joint (1). The guide wire (14) is connected to the wall by sliding, one end of the guide wire (14) is fixedly connected to a connecting rod (15), one end of the connecting rod (15) extends to the outside of the sheath tube connector (1) and is fixedly connected to a push plate (16), the outside of the sheath tube connector (1) away from the push plate (16) is fixedly connected to a liquid inlet (21), the outer side of the sheath tube connector (1) is provided with an outer sheath (17), one end of the outer side of the outer sheath (17) is fixedly connected to a flushing head, and flushing ports (22) matching the liquid inlet (21) are equidistantly provided inside the flushing head.

2. The ureteroscope guide sheath with water inlet at the end according to claim 1, characterized in that: The adjustment mechanism comprises a fixed block (5), the fixed block (5) is fixedly connected to the top of the slide plate (3) and extends to the outside of the sheath tube connector (1), and the fixed block (5) is slidably connected to the inner wall of the sheath tube connector (1), a slider (6) is slidably connected to the lower part of the interior of the fixed block (5), one side of the outer side of the slider (6) extends to the outside of the fixed block (5) and is fixedly connected to a clamping block (7), and one side of the inner wall of the sheath tube connector (1) is equidistantly provided with a plurality of A card slot (8), a second spring (9) is arranged on a side of the fixed block (5) close to the slider (6), an inclined slot (10) is provided inside the slider (6), a pressing block (11) is slidably connected to the top of the fixed block (5), the bottom of the pressing block (11) extends to the inside of the slider (6) and is fixedly connected to a sliding rod (12) matching the inclined slot (10), and a third spring (13) is arranged between the bottom of the pressing block (11) and the inner wall of the fixed block (5).

3. The ureteroscope guide sheath with water inlet at the end according to claim 2, characterized in that: An outer sheath (17) is fixedly connected to the outer side of the sheath tube connector (1) and located outside the inner sheath (2), and the inner sheath (2) is slidably connected to the outer sheath (17).

4. The ureteroscope guide sheath with water inlet at the end according to claim 3, characterized in that: A side of the outer portion of the sheath tube connector (1) close to the push plate (16) is fixedly connected to a pipette (18), and both sides of the outer portion of the sheath tube connector (1) close to the pipette (18) are fixedly connected to limit blocks (19), and a sealing plug (20) is provided at one end of the outer portion of the sheath tube connector (1) close to the limit block (19).

5. The ureteroscope guide sheath with water inlet at the end according to claim 4, characterized in that: The end of the lead wire (14) away from the connecting rod (15) is made of a bendable metal wire material, and the rest is made of a hard metal material; the end of the inner sheath (2) away from the sheath tube connector (1) is made of an elastomeric material, and the rest is made of a composite of nylon, Teflon and 304 stainless steel.

6. The ureteroscope guide sheath with water inlet at the end according to claim 5, characterized in that: The outside of the push plate (16) is provided with anti-slip bumps, and the outsides of the inner sheath (2) and the outer sheath (17) are both coated with a hydrophilic coating.

7. The ureteroscope guide sheath with water inlet at the end according to claim 6, characterized in that: The sealing plug (20) is made of silicone material, and the exterior of the sheath tube connector (1) is provided with a knurled pattern.

8. The flexible ureteroscope guide sheath with water inlet at the end according to claim 7, characterized in that: A cavity is provided inside the sheath tube connector (1) on one side close to the sealing plug (20).

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