Negative pressure suction sheath

Abstract

The negative pressure suction sheath comprises a sheath tube, a negative pressure connector and an expander, 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 near end of the sheath tube is connected with the far end of the main channel cavity, and the expander is inserted from the near end of the main channel cavity and extends out of the far end of the sheath tube. The main channel cavity is detachably connected with the main channel cavity; a side channel opening is formed in one side of the main channel cavity, and the negative pressure suction channel cavity communicates with the side channel opening. The cavity wall of the main channel cavity is further provided with a pressure adjusting opening, the pressure adjusting opening corresponds to the side channel opening or is located at the end, away from the sheathing canal, of the side channel opening, the negative pressure in the sheathing canal can be adjusted by adjusting the opening size of the pressure adjusting opening, and therefore an operator does not need to leave to adjust the negative pressure device to adjust the suction force in the sheathing canal. The negative pressure in the sheathing canal can be adjusted only by adjusting the size of the pressure adjusting opening in the handheld negative pressure connector.

Description

TECHNICAL FIELD

[0001] The utility model relates to medical instrument technical field especially, relate to a kind of 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 are performed by surgeons who make 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 patients suffer and recover. Due to the unique anatomical structure of the kidney, it is difficult to reach the calyces, especially the lower calyces, during endoscopic intrarenal surgery. Unfortunately, even if the calyces are entered during the procedure and the stones are removed and effectively fragmented, removing the fragments from the calyces is still very difficult. As a result, the patient must expel 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 in 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 to expel some small stone fragments 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 to a negative pressure device through the negative pressure connector, and the negative pressure is used to suck and expel the intraoperative fragments and liquid. Since the intraoperative suction force in the sheath tube needs to be adjusted according to the pressure in the human body, the negative pressure device is generally set in a place that cannot be touched by the operator's hand, 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. SUMMARY

[0007] To solve the above technical problems, the utility model provides a kind of negative pressure suction sheath, including sheath tube, 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 tube 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 tube, 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;Pressure regulating port is further provided on the cavity wall of the main channel cavity, and 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 tube, and the opening size of the pressure regulating port can be adjusted to adjust the negative pressure in the sheath tube.

[0008] Optionally, the pressure regulating port is located on the opposite side of the side channel mouth.

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

[0010] Optionally, the pressure regulating port is provided with an adjusting mechanism for adjusting the opening size thereof.

[0011] Optionally, the adjusting mechanism is a valve or a sliding block, and the valve or the sliding block is movably arranged on the pressure regulating port, and the opening size of the pressure regulating port is adjusted by pushing the valve or the sliding block.

[0012] Optionally, the proximal end of the main channel cavity is further provided with a sealing washer and a fixing member, and the sealing washer is sealingly fixed at the proximal end of the main channel cavity by the fixing member; 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.

[0013] 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.

[0014] 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, and 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.

[0015] Optionally, the fixing member is a threaded fixing member, and the sealing washer is fixed at the proximal end of the main channel cavity by the threaded fixing member through threaded 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.

[0016] Optionally, the sheath is single-cavity or multi-cavity structure, and the inner hole of the sealing ring is one or more.

[0017] Optionally, the surgical instrument comprises an endoscope.

[0018] Optionally, the head end of the sheath is a bendable structure.

[0019] 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 a low friction coefficient.

[0020] Compared with the prior art, the technical scheme of the embodiment of the utility model has the following beneficial effects:

[0021] The pressure regulating port is arranged on the main channel cavity of the negative pressure connector, therefore, the operator does not need to leave to adjust the negative pressure device to adjust the size of the suction force in the sheath, only needs to adjust the size of the pressure regulating port on the negative pressure connector held by hand, and the size of the negative pressure in the sheath can be adjusted.

[0022] Further, the utility model avoids that the pressure regulating port is arranged on the cavity wall of the sheath, the negative pressure suction channel cavity and the main channel cavity which is located at the distal end of the side channel port, but the pressure regulating port is arranged on the cavity wall of the main channel cavity corresponding to the side channel port or the distal end of the side channel port away from the sheath, the technical problem that the stones are accumulated in the negative pressure suction channel cavity and the negative pressure suction channel cavity is blocked due to the pressure regulating port arranged on the negative pressure suction channel cavity is solved, and the negative pressure suction effect is improved. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained according to these drawings without the creative labor of the ordinary skilled in the art.

[0024] Figure 1 It is the structure schematic view of the negative pressure suction sheath provided by an embodiment of the utility model;

[0025] Figure 2 It is the structure schematic view of the negative pressure connector provided by an embodiment of the utility model (in the closed state of the pressure regulating port);

[0026] Figure 3The structure schematic view of the negative pressure connector provided by one embodiment of the utility model is shown in the figure (the pressure regulating port is in the open state);

[0027] Figure 4 The structure schematic view of the negative pressure suction sheath provided by another embodiment of the utility model is shown in the figure;

[0028] Figure 5 The contrastive view of the pressure regulating port in the utility model being located at the opposite side of the side passage port and being located at the vertical direction of the side passage port is shown in the figure;

[0029] Figure 6 The installation structure schematic view of the sealing gasket provided by one embodiment of the utility model is shown in the figure;

[0030] Figure 7 The contrastive view of the sealing gasket in the natural state and the state of being axially extruded provided by one embodiment of the utility model is shown in the figure;

[0031] Figure 8 The structure schematic view of the negative pressure connector being a W-shaped connector provided by one embodiment of the utility model is shown in the figure. DETAILED DESCRIPTION

[0032] As described in the background, the current ureteral sheath generally comprises a sheath tube, a negative pressure connector, a dilating tube and the like, the sheath tube is connected with a negative pressure device through the negative pressure connector, and the intraoperative gravel and liquid are sucked and discharged through the negative pressure. Since the size of 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, therefore, the operator cannot leave the operation to adjust the size of the suction force in the sheath tube by adjusting the negative pressure device.

[0033] In order to solve the above technical problems, please refer to Figures 1 to 7 The utility model provides a negative pressure suction sheath, including sheath tube 1, negative pressure connector 2 and dilator 3, the negative pressure connector 2 includes main passage cavity 201 and the negative pressure suction passage cavity 202 at one side of main passage cavity 201, the proximal end of sheath tube 1 is connected with the distal end of main passage cavity 201, the dilator 3 is inserted from the proximal end of main passage cavity 201 and extends out the distal end of sheath tube 1, and is detachably connected with main passage cavity 201, one side of main passage cavity 201 is provided with side passage port 205, and negative pressure suction passage cavity 202 is communicated on side passage port 205, the cavity wall of main passage cavity 201 is further provided with pressure regulating port 203, the pressure regulating port 203 is arranged corresponding to side passage port 205 or is arranged at the end of side passage port 205 away from sheath tube 1, and the size of the negative pressure in sheath tube 1 can be adjusted by adjusting the opening size of pressure regulating port 203.

[0034] The pressure adjusting port 203 is arranged on the main channel cavity 201 of the negative pressure connector 2, therefore, the operator does not need to leave to adjust the negative pressure device to adjust the suction force in the sheath tube 1, only needs to adjust the size of the pressure adjusting port 203 on the hand-held negative pressure connector 2, and the size of the negative pressure in the sheath tube 1 can be adjusted.

[0035] The specific adjustment method of the size of the negative pressure in the sheath tube 1 is that when the minimum negative pressure is needed, the pressure adjusting port 203 is kept fully open or is minimally occluded; when more negative pressure is needed, the pressure adjusting port 203 is closed to the maximum degree of full closure.

[0036] The size adjustment mode of the pressure adjusting port 203 is not specifically limited, for example, the size of the pressure adjusting port 203 can be adjusted by the mode of pressing the pressure adjusting port 203 by fingers; or an adjustment 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 adjustment mechanism 204.

[0037] In the technical field, the negative pressure connector 2 is generally of a Y-shaped structure, which comprises the main channel cavity 201 and the 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 the negative pressure device, therefore, the negative pressure suction channel cavity 202 and the sheath tube 1 form a negative pressure suction gas path, and the stones in the human body are sucked to the outside 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, the person skilled in the art can easily think of arranging the 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 mode 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, therefore, 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 outward through the negative pressure suction channel cavity 202, when the stones are not smaller than the opening diameter of the pressure adjusting port or multiple stones are crowded to discharge from the pressure adjusting port, the stones are easily stuck at the pressure adjusting port, therefore, other stones are easily blocked from being discharged from the negative pressure suction channel cavity 202, and more and more stones are accumulated in the negative pressure suction channel cavity 202, the negative pressure suction channel cavity 202 is blocked, and then the stones in the body cannot be discharged from the negative pressure suction channel cavity 202.

[0038] In order to solve the above technical problems, the utility model avoids setting the pressure regulating port 203 on the cavity wall of the sheath tube 1, the negative pressure suction passage cavity 202 and the main passage cavity 201 at the far end of the side passage port 205, but sets the pressure regulating port 203 on the cavity wall of the main passage cavity 201 corresponding to the side passage port 205 or at the end of the side passage port 205 away from the sheath tube 1, solves the technical problem of stone accumulation in the negative pressure suction passage cavity and blockage of the negative pressure suction passage cavity caused by setting the pressure regulating port on the negative pressure suction passage cavity, and further improves the negative pressure suction effect.

[0039] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0040] An embodiment of the utility model provides a kind of negative pressure suction sheath, including sheath tube 1 and, negative pressure connector 2 and dilator 3, the negative pressure connector 2 includes main passage cavity 201 and located in the negative pressure suction passage cavity 202 of the main passage cavity 201 one side, 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 the distal end of the sheath tube 1, and it is detachably connected with the main passage cavity 201;The side passage port 205 is set in one side of the main passage cavity 201, and the negative pressure suction passage cavity 202 is communicated on the side passage port 205.

[0041] The utility model does not make specific limit to the angle of negative pressure suction passage cavity 202 and main passage cavity 201, and negative pressure suction passage cavity 202 extends outward from the outer surface of main passage cavity 201 and forms an angle greater than 0 ° to less than 180 ° with proximal main passage cavity 201.In an embodiment, negative pressure suction passage cavity 202 extends outward from the outer surface of main passage cavity 201 and to the proximal end direction of main passage cavity 201, i.e. negative pressure suction passage cavity 202 and the proximal end part of main passage cavity 201 form an acute angle, such as 25 ° to 45 °, so as to effectively discharge stone or other foreign matter.

[0042] The utility model does not make specific limit to whether the axis of negative pressure suction passage cavity 202 intersects with the axis of main passage cavity 201, as an embodiment, the axis of negative pressure suction passage cavity 202 intersects with the axis of main passage cavity 201.

[0043] As an embodiment, the cavity wall of the main channel cavity 201 is provided with a pressure regulating port 203, which is arranged opposite to the side channel port 205, i.e. the pressure regulating port 203 is located opposite or beside the side channel port 205.

[0044] Please refer to Figures 1 to 3 and refer to Figure 5 the left side of the figure, Figure 5 The left side of the figure shows that the pressure regulating port 203 is located opposite to the side channel port 205. As a specific embodiment, the pressure regulating port 203 is located opposite to the side channel port 205, i.e. the cavity wall of the main channel cavity 201 is provided with the pressure regulating port 203 at the position opposite to the side channel port 205, therefore, the side channel 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 rapidly increased at the moment when the pressure regulating port 203 is closed, and the gravel can be efficiently sucked out, thereby improving the suction efficiency. If the negative pressure suction force is small, the gravel needs to be sucked out for multiple times, thereby increasing the suction time and further increasing the pain of the patient.

[0045] Please refer to Figure 4 and Figure 5 the right side of the figure, Figure 5 The right side of the figure shows that the pressure regulating port 203' is located vertically to the side channel port 205. As a second specific embodiment, the pressure regulating port 203' is located vertically to the side channel port 205, i.e. the perpendicular line of the pressure regulating port 203' to the axis of the main channel cavity 201 is perpendicular to the perpendicular line of the side channel port 205 to the axis of the main channel cavity 201, or in other words, the pressure regulating port 203' is located on the perpendicular line of the plane a where the axis of the main channel cavity 201 and the axis of the negative pressure suction channel cavity 202 are located. From the perspective of ergonomics, the hand holding the suction sheath holds the negative pressure suction channel cavity 202, at this time, the thumb used to adjust 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 fatigue of the operator.

[0046] As a third specific embodiment, the pressure regulating port 203 is located away from the one end of the sheath tube 1, therefore, the pressure regulating port 203 avoids the negative pressure suction air path formed between the negative pressure suction channel cavity 202 and the sheath tube 1, solves the technical problem of stone accumulation in the negative pressure suction channel cavity 202 and blockage of the negative pressure suction channel cavity 202 caused by the pressure regulating port 203 arranged on the negative pressure suction channel cavity 202, and further improves the negative pressure suction effect.

[0047] 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 utility model is provided with the adjusting mechanism 204 which can adjust the opening size of 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 when holding the suction sheath, without needing to press the finger on the pressure regulating port 203 all the time.

[0048] 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.

[0049] Please refer to Figure 6 In an embodiment, the proximal end of the main channel cavity 201 is further 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 further 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.

[0050] 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 clamping, threaded connection or other detachable or non-detachable fixing modes, 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.

[0051] In the 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.

[0052] In the 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.

[0053] 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.

[0054] 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.

[0055] 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 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

[0056] 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.

[0057] The specific type of the surgical instrument is not limited in the embodiment, and can be an endoscope 6. When the dilator 3 is inserted into the sheath 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 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 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.

[0058] 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.

[0059] 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.

[0060] The present utility model does not limit the specific structure of the threaded fixing part 5 for fixing the sealing ring 4 at the proximal end of the main passage cavity 201. As an embodiment, the threaded fixing part 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, and the distal end of the sleeve structure 501 is open. 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 main passage cavity 201 through the internal threads. The proximal end of the sleeve structure 501 is provided with a cover 502. The cover 502 is provided with a through hole corresponding to the inner hole of the sealing ring 4. The dilator 3 and / or 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 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 through the threaded fixing part 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 press the through hole of the cover 502 while holding the dilator 3 and / or surgical instruments, achieving the sealing of the proximal end of the main passage cavity 201 and further ensuring the negative pressure sealing.

[0061] In the prior art, the sheath 1 is relatively hard and cannot bend with the soft mirror, 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 arranged as 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.

[0062] The soft tip design of the dilator 3 reduces the injury during placement. The 10-40 cm section of the dilator 3 head end 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 human 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 the placement.

[0063] The main body of the dilator 3 is made of polyethylene, polypropylene or other high molecular materials, which has a suitable hardness, and takes 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, which has a suitable hardness and certain anti-deformation ability, and is convenient for the assembly and disassembly with the negative pressure connector 2.

[0064] The sheath tube 1 is a three-layer composite tube, the outer layer is made of nylon or other thermoplastic materials, which has good softness and hardness, and the tube body has good supportability and toughness. The middle layer is made of wound spring or metal woven wire mesh material structure, which makes the tube body have good bending resistance and supportability, and ensures the stability of the channel. The inner layer is usually made of Teflon or other high molecular tubes with low friction coefficient, which makes the tube cavity have good surface smoothness or passability, reduces the insertion and extraction resistance of the endoscope and surgical treatment instruments, and protects the instruments.

[0065] 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.

[0066] The negative pressure suction sheath of the utility model is applicable to the human body and is used for sucking and discharging the stones or / and liquid in the operation by negative pressure, 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 and the like, 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.

[0067] The negative pressure connector is usually made of transparent high molecular materials such as polycarbonate, which is convenient for visual observation of the endoscopic lithotripsy withdrawal distance, negative pressure suction effect and stone discharge condition. The main channel cavity 201 of the negative pressure connector 2 is designed as a funnel shape with the diameter gradually increasing from the small end to the large end, the connecting end of the sheath tube 1 is the small port, and the endoscope inlet and outlet end is the large port. The endoscope end is set to be larger than the sheath tube 1 end by more than 2 Fr, which improves the introduction of the endoscopic 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, which is used for realizing the negative pressure suction. Figure 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 even multiple side channels 206 can be additionally arranged for perfusion of contrast medium or placement of a pressure / temperature measuring catheter or 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.

[0068] 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.

[0069] In conclusion, 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, and only needs to adjust the size of the pressure regulating port 203 on the hand-held negative pressure connector 2, so as to adjust the negative pressure in the sheath tube 1.

[0070] Further, the pressure regulating port 203 is arranged on the cavity wall corresponding to the side channel port 205 or located at the end of the side channel port 205 away from the sheath tube 1 of the main channel cavity 201, which solves the technical problem of stone accumulation 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.

[0071] Although the utility model discloses as above, the utility model is not limited to this. Any person skilled in the art, without departing from the spirit and scope of the utility model, can make various changes and modifications, therefore the protection scope of the utility model should be the range limited by the claims.

Claims

1. A negative pressure suction sheath, characterized in that: The invention comprises a sheath tube, a negative pressure joint and a dilator, wherein the negative pressure joint 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 to the distal end of the main channel cavity, the dilator is inserted from the proximal end of the main channel cavity and extends out of the distal end of the sheath tube, and is detachably connected to the main channel cavity; a side channel opening is opened on one side of the main channel cavity, and the negative pressure suction channel cavity is connected to the side channel opening; a pressure regulating port is also provided on the cavity wall of the main channel cavity, and the pressure regulating port is arranged corresponding to the side channel opening or is arranged at the end of the side channel opening away from the sheath tube, and the negative pressure in the sheath tube can be adjusted by adjusting the opening size of the pressure regulating port.

2. The negative pressure suction sheath according to claim 1, characterized in that The pressure regulating port is located on the opposite side of the side channel port.

3. The negative pressure suction sheath according to claim 1, characterized in that: The pressure regulating port is located on a vertical side of the side channel port.

4. The negative pressure suction sheath according to claim 1, characterized in that: The pressure regulating port is provided with an adjusting mechanism which can adjust the opening size thereof.

5. The negative pressure suction sheath according to claim 4, characterized in that: The regulating mechanism is a valve or a slider, and the valve or the slider is movably arranged on the pressure regulating port. The opening size of the pressure regulating port is adjusted by pushing the valve or the slider.

6. The negative pressure suction sheath according to claim 1, characterized in that: The proximal end of the main channel cavity is also provided with a sealing gasket and a fixing piece, and the sealing gasket is sealed and fixed to the proximal end of the main channel cavity by the fixing piece; the sealing gasket is provided with an inner hole, so that the expander and / or surgical instrument inserted into the main channel cavity can be fixedly sleeved on the inner hole of the sealing gasket to achieve a fixed connection with the main channel cavity.

7. The negative pressure suction sheath according to claim 6, characterized in that: In a natural state, the inner hole diameter of the sealing gasket is not larger than the outer diameter of the expander and / or the surgical instrument.

8. The negative pressure suction sheath according to claim 6, characterized in that: In a natural state, the inner hole diameter of the sealing gasket is larger than the outer diameter of the expander and / or the surgical instrument. The degree of squeezing of the sealing gasket is adjusted by the fixing member, thereby adjusting the size of the inner hole of the sealing gasket, so that the expander and / or the surgical instrument inserted into the main channel cavity are fixedly sleeved on the inner hole of the sealing gasket.

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, which fixes the sealing gasket at the proximal end of the main channel cavity by being threadedly connected to the main channel cavity. The degree of squeezing of the sealing gasket can be adjusted by loosening or tightening the threaded fixing member.

10. The negative pressure suction sheath according to claim 6, characterized in that: The sheath tube is a single-lumen or multi-lumen structure, and correspondingly, the sealing gasket has one or more inner holes.

11. The negative pressure suction sheath according to claim 6, characterized in that: The surgical instrument includes an endoscope.

12. The negative pressure suction sheath according to claim 1, characterized in that: The head end of the sheath tube is a bendable structure.

13. The negative pressure suction sheath according to claim 1, characterized in that: 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 polymer material; if the sheath tube is a three-layer composite tube, its outer layer is made of thermoplastic material, the middle layer is a wound spring or a metal woven wire mesh structure, and the inner layer is a polymer tube with a low friction coefficient.

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