Negative pressure suction sheath

Abstract

Disclosed is a negative pressure suction sheath, comprising a sheath tube (1), a negative pressure connector (2), and a dilator (3). The negative pressure connector (2) comprises a main channel cavity (201) and a negative pressure suction channel cavity (202) located on one side of the main channel cavity (201). A proximal end of the sheath tube (1) is connected to a distal end of the main channel cavity (201). The dilator (3) is inserted from a proximal end of the main channel cavity (201) and extends out of a distal end of the sheath tube (1) and is detachably connected to the main channel cavity (201). A side channel port (205) is formed on one side of the main channel cavity (201), and the negative pressure suction channel cavity (202) is in communication with the side channel port (205). A cavity wall of the main channel cavity (201) is further provided with a pressure regulating port (203). The pressure regulating port (203) is arranged corresponding to the side channel port (205) or is located at one end of the side channel port (205) distal to the sheath tube (1), and the magnitude of the negative pressure in the sheath tube (1) can be adjusted by adjusting the opening size of the pressure regulating port (203).

Description

Negative pressure suction sheath TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, and in particular to a negative pressure suction sheath. BACKGROUND

[0002] Kidney stones have plagued mankind for a long time. Complications caused by the presence of stones in the urinary tract often require surgical intervention. Traditional surgical procedures to remove stones involve surgeons making an incision in the patient's abdomen to remove the stones, and the patient needs to stay in the hospital for a long time to recover.

[0003] The use of minimally invasive stone extraction devices has shortened the time that patients suffer and recover. Due to the unique anatomical structure of the kidney, it is difficult to reach the calyces, especially the lower calyces, in endoscopic intrarenal surgery. Unfortunately, even if the calyces are entered during the operation and the stones are removed and effectively fragmented, it is still very difficult to remove the fragments from the calyces. As a result, the patient must excrete the fragments on their own, which will prolong the treatment time and the experience of suffering and discomfort.

[0004] The ureteral sheath is used in urological surgery, and before the operation, the ureteral sheath is placed into the ureter to establish a surgical channel, and during the operation, an endoscope, a laser fiber, a stone extraction instrument, etc. are introduced through the surgical channel, and some small stone fragments are discharged from the ureteral sheath.

[0005] The existing ureteral sheath generally includes a sheath tube, a negative pressure connector, and a dilating tube, etc. The sheath tube is connected with a negative pressure device through the negative pressure connector, and the negative pressure is used to suck and discharge the intraoperative stone fragments and liquid. Since the intraoperative suction force in the sheath tube needs to be adjusted according to the pressure in the human body, but the negative pressure device is generally arranged at a place that cannot be touched by the hand of the operator (i.e. the surgical operator), such as on the wall of the operating room, therefore, the operator cannot leave to adjust the negative pressure device to adjust the suction force in the sheath tube during the operation.

[0006] Therefore, how to adjust the suction force in the sheath tube according to the pressure in the human body during the operation has become a technical problem to be solved in the field.

[0007] SUMMARY

[0008] To solve the above technical problems, the present application provides a kind of negative pressure suction sheath, including sheath pipe, negative pressure connector and dilator, the negative pressure connector includes main channel cavity and the negative pressure suction channel cavity located in the main channel cavity one side, the proximal end of the sheath pipe is connected with the distal end of the main channel cavity, the dilator is inserted from the proximal end of the main channel cavity and extends out the distal end of the sheath pipe, and it is detachably connected with the main channel cavity;The side channel mouth is opened in one side of the main channel cavity, and the negative pressure suction channel cavity is communicated on the side channel mouth;The cavity wall of the main channel cavity is further provided with pressure regulating port, the pressure regulating port is arranged corresponding to the side channel mouth or is arranged at the end of the side channel mouth away from the sheath pipe, and the size of the opening of the pressure regulating port can be adjusted to adjust the negative pressure in the sheath pipe.

[0009] Optionally, the pressure regulating port is located on the opposite side of the side channel mouth.

[0010] Optionally, the pressure regulating port is located on the vertical side of the side channel mouth.

[0011] Optionally, the pressure regulating port is provided with an adjusting mechanism for adjusting the size of the opening thereof.

[0012] Optionally, the adjusting mechanism is a valve or a slider, which is movably arranged on the pressure regulating port, and the size of the opening of the pressure regulating port is adjusted by pushing the valve or the slider.

[0013] Optionally, the proximal end of the main channel cavity is further provided with a sealing washer and a fixing member, the sealing washer is sealingly fixed on the proximal end of the main channel cavity by the fixing member, and the sealing washer is provided with an inner hole, so that the dilator or / and surgical instrument inserted into the main channel cavity is fixedly connected with the main channel cavity by being fixedly sleeved on the inner hole of the sealing washer.

[0014] Optionally, in a natural state, the inner hole diameter of the sealing washer is not greater than the outer diameter of the dilator or / and surgical instrument.

[0015] Optionally, in a natural state, the inner hole diameter of the sealing washer is greater than the outer diameter of the dilator or / and the surgical instrument, the degree of extrusion of the sealing washer is adjusted by the fixing member, and then the size of the inner hole of the sealing washer is adjusted, so that the dilator or / and the surgical instrument inserted into the main channel cavity is fixedly sleeved on the inner hole of the sealing washer.

[0016] Optionally, the fixing member is a threaded fixing member, the threaded fixing member fixes the sealing washer on the proximal end of the main channel cavity by thread connection with the main channel cavity, and the degree of extrusion of the sealing washer can be adjusted by loosening or tightening the threaded fixing member.

[0017] Optionally, the sheath is single-cavity or multi-cavity structure, and the inner hole of the sealing ring is one or more.

[0018] Optionally, the surgical instrument comprises an endoscope.

[0019] Optionally, the head end of the sheath is a bendable structure.

[0020] Optionally, the sheath is a single-layer tube or a three-layer composite tube, if the sheath is a single-layer tube, the material of the sheath is a polymer material, if the sheath is a three-layer composite tube, the outer layer is made of a thermoplastic material, the middle layer is a spring or a metal woven wire structure, and the inner layer is a polymer tube with low friction coefficient.

[0021] Compared with the prior art, the technical scheme of the embodiment of the present application has the following beneficial effects:

[0022] The pressure regulating port is arranged on the main channel cavity of the negative pressure connector, so that the operator does not need to leave to adjust the negative pressure device to adjust the suction force in the sheath, and only needs to adjust the size of the pressure regulating port on the hand-held negative pressure connector to adjust the negative pressure in the sheath.

[0023] Further, the present application avoids opening the pressure regulating port on the cavity wall of the sheath, the negative pressure suction channel cavity and the main channel cavity located at the distal end of the side channel port, and instead opens the pressure regulating port on the cavity wall of the main channel cavity corresponding to the side channel port or located at the end of the side channel port away from the sheath, thereby solving the technical problem of stone accumulation in the negative pressure suction channel cavity and blocking the negative pressure suction channel cavity caused by opening the pressure regulating port on the negative pressure suction channel cavity, and further improving the negative pressure suction effect. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0025] Fig. 1 is a structural schematic view of a negative pressure suction sheath according to an embodiment of the present application;

[0026] Fig. 2 is a structural schematic view of a negative pressure connector according to an embodiment of the present application (in a closed state of the pressure regulating port);

[0027] Fig. 3 is a structural schematic view of a negative pressure connector according to an embodiment of the present application (in an open state of the pressure regulating port);

[0028] Figure 4 is a schematic diagram of the structure of the negative pressure suction sheath according to another embodiment of the present application;

[0029] Figure 5 is a comparison diagram of the pressure regulating port located at the opposite side of the side passage port and located at the vertical direction of the side passage port according to the present application;

[0030] Figure 6 is a schematic diagram of the installation structure of the sealing washer according to an embodiment of the present application;

[0031] Figure 7 is a comparison diagram of the sealing washer in the natural state and the state of being axially extruded according to an embodiment of the present application;

[0032] Figure 8 is a schematic diagram of the structure of the W-shaped negative pressure connector according to an embodiment of the present application. DETAILED DESCRIPTION

[0033] As described in the background, the current ureteral sheath generally comprises a sheath tube, a negative pressure connector, a dilator and the like, the sheath tube is connected with a negative pressure device through the negative pressure connector, and the negative pressure is used to suck and discharge the lithotripsy and liquid in the operation. Since the suction force in the sheath tube needs to be adjusted according to the pressure in the human body during the operation, the negative pressure device is generally arranged at a place which cannot be touched by the hand of the operator, such as the wall of the operating room, and thus the operator cannot leave the operation to adjust the negative pressure device to adjust the suction force in the sheath tube.

[0034] In order to solve the above technical problems, please refer to Figures 1 to 7, the present application provides a negative pressure suction sheath, which comprises a sheath tube 1, a negative pressure connector 2 and a dilator 3, the negative pressure connector 2 comprises a main passage cavity 201 and a negative pressure suction passage cavity 202 located at one side of the main passage cavity 201, the proximal end of the sheath tube 1 is connected with the distal end of the main passage cavity 201, the dilator 3 is inserted from the proximal end of the main passage cavity 201 and extends out of the distal end of the sheath tube 1, and is detachably connected with the main passage cavity 201; a side passage port 205 is arranged at one side of the main passage cavity 201, and the negative pressure suction passage cavity 202 is communicated on the side passage port 205; a pressure regulating port 203 is further arranged on the cavity wall of the main passage cavity 201, and the pressure regulating port 203 is arranged corresponding to the side passage port 205 or arranged at the end of the side passage port 205 which is away from the sheath tube 1, and the size of the negative pressure in the sheath tube 1 can be adjusted by adjusting the opening size of the pressure regulating port 203.

[0035] The pressure regulating port 203 is arranged on the main passage cavity 201 of the negative pressure connector 2 according to the present application, and thus the operator does not need to leave to adjust the negative pressure device to adjust the suction force in the sheath tube 1, and only needs to adjust the size of the pressure regulating port 203 on the hand-held negative pressure connector 2 to adjust the size of the negative pressure in the sheath tube 1.

[0036] The specific method for adjusting the size of the negative pressure in the sheath tube 1 is as follows: when the minimum negative pressure is needed, the pressure adjusting port 203 is kept fully open or is slightly closed; when more negative pressure is needed, the pressure adjusting port 203 is closed to the maximum extent.

[0037] The size adjustment method of the pressure adjusting port 203 is not specifically limited in the present application, for example, the size of the pressure adjusting port 203 can be adjusted by pressing the pressure adjusting port 203 with a finger; or an adjusting mechanism 204 can be arranged on the pressure adjusting port 203, and the size of the pressure adjusting port 203 is adjusted by manually adjusting the adjusting mechanism 204.

[0038] In the technical field, the negative pressure connector 2 is generally in a Y-shaped structure, which includes a main channel cavity 201 and a negative pressure suction channel cavity 202 located on the side of the main channel cavity 201. The negative pressure suction channel cavity 202 is connected with a negative pressure device, so that a negative pressure suction gas path is formed between the negative pressure suction channel cavity 202 and the sheath tube 1, and the stones in the human body are sucked out of the human body through the negative pressure suction gas path. Since the negative pressure suction channel cavity 202 is located on the negative pressure suction gas path and is connected with the negative pressure device, those skilled in the art can easily think of arranging a pressure adjusting port on the cavity wall of the negative pressure suction channel cavity 202, and adjusting the size of the pressure adjusting port to adjust the negative pressure. However, this method of opening the pressure adjusting port on the negative pressure suction channel cavity 202 destroys the integrity of the cavity wall of the negative pressure suction channel cavity 202, so that when the pressure adjusting port is in a fully open or not fully open state, the stones are also easily discharged from the pressure adjusting port when being discharged outwards through the negative pressure suction channel cavity 202, and when the stones are not smaller than the opening diameter of the pressure adjusting port or multiple stones are crowded out of the pressure adjusting port, the stones are easily stuck in the pressure adjusting port, so that other stones are easily blocked from being discharged out of the negative pressure suction channel cavity 202. In the long run, more and more stones are accumulated in the negative pressure suction channel cavity 202, which blocks the negative pressure suction channel cavity 202, and then the stones in the body cannot be discharged out of the negative pressure suction channel cavity 202.

[0039] In order to solve the above technical problems, the present application avoids opening the pressure adjusting port 203 on the sheath tube 1, the negative pressure suction channel cavity 202 and the cavity wall of the main channel cavity 201 located at the distal end of the side channel port 205, but opens the pressure adjusting port 203 on the cavity wall of the main channel cavity 201 corresponding to the side channel port 205 or located at the end of the side channel port 205 away from the sheath tube 1, which solves the technical problem of stone accumulation in the negative pressure suction channel cavity and blockage of the negative pressure suction channel cavity caused by opening the pressure adjusting port on the negative pressure suction channel cavity, and further improves the negative pressure suction effect.

[0040] Clearly, the embodiments described are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative effort shall fall within the protection scope of the present application.

[0041] An embodiment of the present application provides a negative pressure suction sheath, comprising a sheath tube 1, a negative pressure connector 2 and a dilator 3, the negative pressure connector 2 comprises a main channel cavity 201 and a negative pressure suction channel cavity 202 located on one side of the main channel cavity 201, a proximal end of the sheath tube 1 is connected with a distal end of the main channel cavity 201, the dilator 3 is inserted from a proximal end of the main channel cavity 201 and extends out of a distal end of the sheath tube 1, and is detachably connected with the main channel cavity 201; a side channel port 205 is formed on one side of the main channel cavity 201, and the negative pressure suction channel cavity 202 is communicated on the side channel port 205.

[0042] The present application does not make specific limitation on the included angle between the negative pressure suction channel cavity 202 and the main channel cavity 201, the negative pressure suction channel cavity 202 extends outward from the outer surface of the main channel cavity 201 and forms an angle greater than 0° to less than 180° with the proximal main channel cavity 201. In an embodiment, the negative pressure suction channel cavity 202 extends outward from the outer surface of the main channel cavity 201 and towards the proximal end of the main channel cavity 201, that is, an acute angle, such as 25° to 45°, is formed between the negative pressure suction channel cavity 202 and the proximal part of the main channel cavity 201, so as to effectively discharge stones or other foreign matters.

[0043] The present application does not make specific limitation on whether the axis of the negative pressure suction channel cavity 202 intersects with the axis of the main channel cavity 201, as an embodiment, the axis of the negative pressure suction channel cavity 202 intersects with the axis of the main channel cavity 201.

[0044] As an embodiment, a pressure adjusting port 203 is arranged on the cavity wall of the main channel cavity 201, the pressure adjusting port 203 is arranged corresponding to the side channel port 205, that is, the pressure adjusting port 203 is located on the opposite side or the side of the side channel port 205.

[0045] Please refer to FIG. 1 to FIG. 3, and refer to the left side of FIG. 5, which shows that the pressure regulating port 203 is located on the opposite side of the side passage port 205. As a specific embodiment, the pressure regulating port 203 is located on the opposite side of the side passage port 205, that is, the cavity wall of the main passage cavity 201 is provided with the pressure regulating port 203 on the position opposite to the side passage port 205, so that the side passage port 205 and the pressure regulating port 203 can easily form a "crosswind" gas convection, and the "crosswind" convection can enhance the negative pressure suction effect. The negative pressure suction force can be quickly enhanced at the moment when the pressure regulating port 203 is closed, so that the gravel can be efficiently sucked out, and the suction efficiency is improved. If the negative pressure suction force is small, the gravel needs to be sucked out for multiple times, so that the suction time is increased, and the patient's pain is increased.

[0046] Please refer to FIG. 4 and the right side of FIG. 5, which shows that the pressure regulating port 203' is located on the vertical side of the side passage port 205. As a second specific embodiment, the pressure regulating port 203' is located on the vertical side of the side passage port 205, that is, the perpendicular line of the pressure regulating port 203' to the axis of the main passage cavity 201 is perpendicular to the perpendicular line of the side passage port 205 to the axis of the main passage cavity 201, or the pressure regulating port 203' is located on the perpendicular line of the plane a in which the axis of the main passage cavity 201 and the axis of the negative pressure suction passage cavity 202 are located. From the perspective of ergonomics, the hand holding the suction sheath holds the negative pressure suction passage cavity 202, so that the thumb for adjusting the opening size of the pressure regulating port 203' is closer to the vertical side, which is more convenient for the operator to operate and relieves the operator's fatigue.

[0047] As a third specific embodiment, the pressure regulating port 203 is located on the side away from the one end of the sheath tube 1, so that the pressure regulating port 203 avoids the negative pressure suction air path formed between the negative pressure suction passage cavity 202 and the sheath tube 1, solves the technical problem of stone accumulation in the negative pressure suction passage cavity 202 and blockage of the negative pressure suction passage cavity 202 caused by the pressure regulating port 203 on the negative pressure suction passage cavity 202, and improves the negative pressure suction effect.

[0048] In the prior art, when negative pressure suction is needed, the finger needs to be pressed on the pressure regulating port 203 all the time to maintain the sealing state, and long-time operation will cause the operator to be tired. Meanwhile, it will also affect the operation of the operation, taking the right hand as an example, the existing soft mirror operation needs the operator to hold the mirror with the right hand, and fix the soft mirror sheath with the left hand, once the left hand finger presses the pressure regulating port, it is inevitable that the soft mirror sheath cannot be fixed, which causes the soft mirror sheath to move and affects the operation of holding the mirror and taking stones. In order to solve the technical problem, the adjusting mechanism 204 for adjusting the opening size of the pressure regulating port 203 is arranged on the pressure regulating port 203, and the left hand of the operator can adjust the adjusting mechanism 204 to the required position by the thumb while holding the suction sheath, without needing to press the finger on the pressure regulating port 203 all the time.

[0049] In an embodiment, the adjusting mechanism 204 is a valve or a sliding block, which is movably arranged on the pressure regulating port 203, and the opening size of the pressure regulating port 203 is adjusted by pushing the valve or the sliding block.

[0050] Please refer to FIG. 6, in an embodiment, the proximal end of the main channel cavity 201 is also provided with a sealing washer 4 and a fixing member, the sealing washer 4 is sealingly fixed on the proximal end of the main channel cavity 201 through the fixing member, the sealing of the proximal end of the main channel cavity 201 is realized, and the negative pressure sealing property is ensured. The sealing washer 4 is provided with an inner hole, so that the dilator 3 or / and the surgical instrument inserted into the main channel cavity 201 is fixedly connected with the main channel cavity 201 by being fixedly sleeved on the inner hole of the sealing washer 4.

[0051] The fixed connection mode of the fixing member and the proximal end of the main channel cavity 201 is not limited in this embodiment, which can be a detachable or non-detachable fixing mode such as clamping, threaded connection and the like, in order to facilitate the replacement of the sealing washer 4, the fixing member and the main channel cavity 201 are preferably fixedly connected in a detachable mode.

[0052] In a natural state, when the inner hole diameter of the sealing washer 4 is not greater than the outer diameter of the dilator 3 or / and the surgical instrument, the dilator 3 or / and the surgical instrument can be fixedly sleeved with the sealing washer 4 by being directly inserted into the inner hole of the sealing washer 4.

[0053] In a natural state, when the inner hole diameter of the sealing washer 4 is greater than the outer diameter of the dilator 3 or / and the surgical instrument, the degree of extrusion of the sealing washer 4 needs to be adjusted by the fixing member, and then the size of the inner hole of the sealing washer 4 is adjusted, so that the dilator 3 or / and the surgical instrument inserted into the main channel cavity 201 is fixedly sleeved in the inner hole of the sealing washer 4.

[0054] The fixed sleeve of the above is that the sealing washer 4 is sleeved on the dilator 3 or / and surgical instrument through the inner hole, and there is no gap between the sealing washer 4 and the outer periphery of the dilator 3 or / and surgical instrument.

[0055] As an implementation manner, the fixing member is a threaded fixing member 5, which fixes the sealing washer 4 in the proximal end of the main channel cavity 201 through threaded connection with the main channel cavity 201; the sealing washer 4 is provided with an inner hole, and the degree of extrusion of the sealing washer 4 is adjusted by loosening or tightening the threaded fixing member 5, and then the size of the inner hole of the sealing washer 4 is adjusted, so that the dilator 3 or / and surgical instrument inserted into the main channel cavity 201 is fixedly connected with the main channel cavity 201 by being fixedly sleeved on the inner hole of the sealing washer 4.

[0056] In a natural state, the thickness of the sealing washer 4 is L1, and when the inner hole diameter d1 of the sealing washer 4 is not less than the outer diameter of the dilator 3 or / and surgical instrument, therefore, the dilator 3 or / and surgical instrument can smoothly pass through the inner hole of the sealing washer 4 into the sheath tube 1. By tightening the threaded fixing member 5, the threaded axial extrusion of the sealing washer 4 is realized, and after the sealing washer 4 is axially extruded and deformed, the thickness is L2, L1>L2; the inner hole diameter of the sealing washer 4 is reduced to d2, d2

[0057] In a natural state, when the inner hole diameter of the sealing washer 4 is less than the outer diameter of the dilator 3 or / and surgical instrument, the dilator 3 or / and surgical instrument can be fixedly sleeved with the sealing washer 4 without extruding the sealing washer 4.

[0058] The embodiment does not limit the specific type of surgical instrument, which can be an endoscope 6. When the dilator 3 is inserted into the sheath tube 1, the proximal end of the dilator 3 is located in the inner hole of the sealing washer 4, and the fixed connection of the dilator 3 and the negative pressure connector 2 is realized by tightening the threaded fixing member 5. After the sheath tube 1 and the dilator 3 fixed on the negative pressure connector 2 are inserted into the human body, the threaded fixing member 5 is loosened, the dilator 3 is pulled out, the endoscope 6 is inserted into the sheath tube 1 through the inner hole of the sealing washer 4, and the threaded fixing member 5 is tightened, so as to realize the fixed connection of the endoscope and the negative pressure connector 2. When the endoscope 6 needs to be moved, the threaded fixing member 5 is loosened again, and the endoscope 6 can be moved for diagnosis and treatment. Since the sealing washer 4 has a variable inner hole diameter, it can be applied to dilators 3 and endoscopes 6 of different sizes.

[0059] In the present embodiment, when the gravel is small, they can enter the space between the endoscope and the sheath 1, and finally be discharged through the negative pressure suction passage cavity 202. When the gravel is large but still small enough to enter the sheath 1, the endoscope can be withdrawn to a position close to the distal end of the negative pressure suction passage cavity 202, allowing the gravel to be sequentially sucked out of the sheath 1 and the negative pressure suction passage cavity 202.

[0060] The present embodiment does not limit the number of inner holes of the sealing ring 4, which can be set according to the inner cavity structure of the sheath 1. For example, if the sheath 1 has a single-cavity structure, the sealing ring 4 has one inner hole; if the sheath 1 has a multi-cavity structure, the sealing ring 4 has multiple inner holes.

[0061] The present application does not limit the specific structure of the threaded fixing member 5 for fixing the sealing ring 4 at the proximal end of the main passage cavity 201. As an embodiment, the threaded fixing member 5 includes a sleeve structure 501 coaxially arranged with the main passage cavity 201. The proximal end of the main passage cavity 201 is provided with external threads, the distal end of the sleeve structure 501 is open, and the inner wall of the distal end of the sleeve structure 501 is provided with internal threads matching the external threads. The sleeve structure 501 is threadedly connected to the external threads of the main passage cavity 201 through its internal threads. The proximal end of the sleeve structure 501 is provided with a cover 502 having a through hole corresponding to the inner hole of the sealing ring 4. The dilator 3 or / and surgical instruments pass through the through hole of the cover 502 and the inner hole of the sealing ring 4 into the sheath 1 in sequence. The outer diameter of the sealing ring 4 is greater than the inner diameter of the proximal end of the main passage cavity 201 and greater than the through hole of the cover 502. Therefore, when the sealing ring 4 is fixed at the proximal end of the main passage cavity 201 by the threaded fixing member 5, the proximal end faces of the main passage cavity 201 on both sides of the sealing ring 4 and the cover 502 will simultaneously press the sealing ring 4. Therefore, the sealing ring 4 will also seal the through hole of the cover 502 while holding the dilator 3 or / and surgical instruments, thereby sealing the proximal end of the main passage cavity 201 and ensuring the negative pressure sealing.

[0062] In the prior art, the sheath 1 is relatively hard and cannot bend with the soft scope, making it difficult to reach certain parts of the human body, such as the kidneys. Therefore, the stones in these parts cannot be cleaned by negative pressure suction, and only instruments such as stone retrieval baskets can be inserted into the sheath 1 to grasp the stones, causing pain and economic burden to the patient. To solve this technical problem, the head end 101 (i.e. the distal end) of the sheath 1 in the present embodiment can be provided with a bendable structure, thereby improving the efficiency of negative pressure stone removal and reducing the use of instruments such as stone retrieval baskets, thereby reducing the economic burden on the patient. The head end 5-15 cm of the sheath 1 has a different hardness from the rear section. The head end can be passively bent with the endoscope, reaching the renal pelvis and calyces of the kidney, and directly capturing the gravel to be sucked out of the body.

[0063] The soft tip design of the dilator 3 reduces the injury during placement. The 10-40 cm section of the head end of the dilator 3 containing the tapered portion is set to have a different hardness from the main body section, so that when the dilator 3 encounters a narrow and twisted body cavity, the soft head section can smoothly pass through the tortuous part, avoiding the damage to the mucosa or the puncture and tearing of the ureter, and improving the safety of placement.

[0064] The main body of the dilator 3 is made of polyethylene, polypropylene or other high molecular materials, and has a suitable hardness, taking into account the passability and supportability during placement. The dilator 3 can be designed as a single lumen or a multi-lumen structure, the first lumen is used for passing the guide wire, and the second or other channels are used for perfusing liquid or passing the visual observation instrument and other diagnostic and therapeutic instruments. The handle of the dilator is usually made of polypropylene or other high molecular materials, and has a suitable hardness and certain anti-deformation ability, facilitating the assembly and disassembly of the negative pressure connector 2.

[0065] The sheath tube 1 is a three-layer composite tube, the outer layer is made of nylon or other thermoplastic materials, taking into account the good hardness and softness, so that the tube body has good supportability and toughness. The middle layer is made of wound spring or metal woven wire mesh material structure, so that the tube body has good bending resistance and supportability, ensuring the stability of the channel. The inner layer is usually made of Teflon or other high molecular tubes with low friction coefficient, so that the tube cavity has good surface smoothness or passability, reducing the insertion and removal resistance of the endoscope and surgical treatment instruments, and protecting the instruments.

[0066] The sheath tube 1 can be designed as a single lumen or a multi-lumen structure, the first lumen is used for passing the dilator 3 and the endoscopic lithotripsy instrument, and the second lumen is used for passing the safety guide wire or other diagnostic and therapeutic instruments.

[0067] The negative pressure suction sheath of the present application is suitable for the specific part of the human body, and the stones or / and liquid in the body are sucked and discharged by negative pressure during the operation, therefore, the size of the sheath tube 1 is not limited, and can be set according to the actual use requirement. For example, the negative pressure suction sheath is used for treating ureteral calculi, kidney stones, gallstones, etc., the inner diameter of the sheath tube 1 is 8-16 French, the outer diameter is 10-18 French, and the effective length is 10-60 cm. In use, the sheath tube 1 is inserted into the human body, and the negative pressure connector 2 is located outside the human body.

[0068] The negative pressure connector is usually made of transparent polymer material such as polycarbonate, which facilitates visual observation of the distance of the endoscope from the stone, the negative pressure suction effect and the stone discharge. The main channel cavity 201 of the negative pressure connector 2 is designed as a funnel shape with a gradually increasing diameter, the sheath tube 1 has a thin end, and the endoscope has a thick end. The endoscope end is designed to be larger than the sheath tube 1 end by more than 2 Fr, which improves the introduction of the endoscope instrument. The negative pressure connector 2 can be a Y-shaped connector, that is, a negative pressure suction channel cavity 202 is arranged on one side of the main channel cavity 201 for realizing negative pressure suction. Referring to FIG. 8, the negative pressure connector 2 can also be a W-shaped connector, that is, in addition to the negative pressure suction channel cavity 202 arranged on the side of the main channel 201, a side channel 206 or multiple side channels 206 can be additionally arranged for realizing perfusion of contrast agent or placement of a pressure / temperature measuring catheter and other instruments. The inner diameter of the negative pressure suction channel cavity 202 is not less than the inner diameter of the sheath tube 1, so as to ensure that the suction efficiency of the negative pressure suction channel cavity 202 is not less than the suction efficiency of the main channel.

[0069] The negative pressure suction channel cavity 202 is in communication with a main pipe, the other end of the main pipe is connected to a collection container, one end of an auxiliary pipe is connected to the collection container, and the other end of the auxiliary pipe is connected to a negative pressure device, and the tissue debris is removed by starting the negative pressure device.

[0070] In summary, the pressure regulating port 203 is arranged on the main channel cavity 201 of the negative pressure connector 2, so that the operator does not need to leave to adjust the negative pressure device to adjust the suction force in the sheath tube 1, but only needs to adjust the size of the pressure regulating port 203 on the hand-held negative pressure connector 2 to adjust the negative pressure in the sheath tube 1.

[0071] Further, the pressure regulating port 203 is arranged on the cavity wall corresponding to the side channel port 205 or the end of the main channel cavity 201 away from the sheath tube 1, instead of being arranged on the cavity wall of the sheath tube 1, the negative pressure suction channel cavity 202 and the main channel cavity 201 located distally to the side channel port 205, which solves the technical problem of accumulation of stones in the negative pressure suction channel cavity 202 and blockage of the negative pressure suction channel cavity 202 caused by the arrangement of the pressure regulating port 203 on the negative pressure suction channel cavity 202, and further improves the negative pressure suction effect.

[0072] Although the present application is disclosed as above, the present application is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present application, and the protection scope of the present application should be subject to the scope defined by the claims.

Claims

1. A negative pressure suction sheath characterized by, The sheath tube, negative pressure connector and dilator are provided, the negative pressure connector comprises a main channel cavity and a negative pressure suction channel cavity located on one side of the main channel cavity, the proximal end of the sheath tube is connected with the distal end of the main channel cavity, the dilator is inserted into the proximal end of the main channel cavity and extends out of the distal end of the sheath tube, and is detachably connected with the main channel cavity; a side channel port is formed on one side of the main channel cavity, and the negative pressure suction channel cavity is communicated with the side channel port; a pressure adjusting port is further arranged on the cavity wall of the main channel cavity, and the pressure adjusting port is arranged corresponding to the side channel port or at the end of the side channel port away from the sheath tube, and the negative pressure in the sheath tube can be adjusted by adjusting the opening size of the pressure adjusting port.

2. The negative pressure suction sheath of claim 1, wherein, The pressure adjusting port is located on the opposite side of the side channel port.

3. The negative pressure suction sheath of claim 1, wherein, The pressure adjusting port is located on the vertical side of the side channel port.

4. The negative pressure suction sheath of claim 1, wherein, An adjusting mechanism for adjusting the opening size of the pressure adjusting port is arranged on the pressure adjusting port.

5. The negative pressure suction sheath of claim 4, wherein, The adjusting mechanism is a valve or a sliding block, the valve or the sliding block is movably arranged on the pressure adjusting port, and the opening size of the pressure adjusting port is adjusted by pushing the valve or the sliding block.

6. The negative pressure suction sheath of claim 1, wherein, The proximal end of the main channel cavity is further provided with a sealing washer and a fixing member, the sealing washer is sealingly fixed on the proximal end of the main channel cavity through the fixing member; an inner hole is arranged on the sealing washer, so that the dilator or / and surgical instrument inserted into the main channel cavity is fixedly connected with the main channel cavity by being fixedly sleeved on the inner hole of the sealing washer.

7. The negative pressure suction sheath of claim 6, wherein, In a natural state, the inner hole diameter of the sealing washer is not greater than the outer diameter of the dilator or / and surgical instrument.

8. The negative pressure suction sheath of claim 6, wherein, In a natural state, the inner hole diameter of the sealing washer is greater than the outer diameter of the dilator or / and surgical instrument, the degree of extrusion of the sealing washer is adjusted through the fixing member, and then the size of the inner hole of the sealing washer is adjusted, so that the dilator or / and surgical instrument inserted into the main channel cavity is fixedly sleeved on the inner hole of the sealing washer.

9. The negative pressure suction sheath according to any one of claims 6 to 8, characterized in that, The fixing member is a threaded fixing member, the threaded fixing member fixes the sealing washer on the proximal end of the main channel cavity through thread connection with the main channel cavity, and the degree of extrusion of the sealing washer can be adjusted by loosening or tightening the threaded fixing member.

10. The negative pressure suction sheath of claim 6, wherein, The sheath tube is a single-cavity or multi-cavity structure, and correspondingly, the inner hole of the sealing washer is one or more.

11. The negative pressure suction sheath of claim 6, wherein, The surgical instrument comprises an endoscope.

12. The negative pressure suction sheath of claim 1, wherein, The head end of the sheath tube is a bendable structure.

13. The negative pressure suction sheath of claim 1, wherein, The sheath tube is a single-layer tube or a three-layer composite tube, if the sheath tube is a single-layer tube, the material of the sheath tube is a high polymer material, if the sheath tube is a three-layer composite tube, the outer layer is made of a thermoplastic material, the middle layer is a wound spring or a metal woven wire structure, and the inner layer is a high polymer tube with a low friction coefficient.

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