Reducing bendable ureter guiding sheath tube

Abstract

The utility model discloses a reducing bendable ureter guiding sheath tube which comprises a sheath body, a head fixing tube is arranged at the front end of the sheath body, and a sheath tube which is far away from the sheath body and extends forwards is arranged in the head fixing tube. A reducing section is arranged on the sheathing canal, a reducing starting point is arranged at one end, far away from the head fixing tube, of the reducing section, a reducing ending point is arranged at one end, close to the head fixing tube, of the reducing section, and the reducing starting point is arranged at the front part, far away from the head fixing tube, of the sheathing canal and is arranged at the rear part, close to the head fixing tube, of the sheathing canal; the diameter of the variable-diameter section is gradually increased from a variable-diameter starting point to a variable-diameter ending point; a bent section is arranged at the head end, away from the head fixing tube, of the sheathing canal; one side of the sheath body is provided with a negative pressure connecting pipe which extends laterally, and the other side, away from the negative pressure connecting pipe, of the sheath body is provided with a pressure measuring pipe which extends laterally. The diameter-variable guide sheathing canal can guarantee that negative pressure suction is smoother, the pressure in the kidney can be better controlled, better water return can be achieved, and the operation risk can be obviously reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to medical instrument technical field, especially a guide sheath tube for establishing an instrument channel between urethra bladder and ureter and renal pelvis. BACKGROUND

[0002] Ureter guide sheath, mainly used in clinical urological surgery, to establish a channel for endoscope and other instruments to enter the urinary tract; the doctor finds the stone through the soft mirror, cooperates holmium laser to break the stone, and then uses negative pressure suction to suck the broken stone, if only broken, the stone disease may relapse after a few years, increasing the risk. In the process of using negative pressure suction to break the stone in the existing urological surgery, the negative pressure switch is not convenient, the negative pressure stone operation is not convenient, and the pressure index of negative pressure cannot be directly displayed, increasing the operation difficulty and operation time.

[0003] In addition, the size of the existing ureter sheath tube is fixed from head to tail, the inner diameter specification is 9Fr, 10Fr, 11Fr, 12Fr, 13Fr, 14Fr and 15Fr, and the sheath tube length specification is 40 / 45 / 50cm. According to the size of the urethral orifice to the bladder, the distance is much larger than that of the ureter to the renal pelvis, and many patients are born with narrow ureter, so the doctor must choose the guide sheath tube that can pass through the ureter, so that the sheath tube can only be selected to be thin to pass through the ureter, and the operation time is generally prolonged when the thin sheath tube is used with the soft mirror to take the stone, because more time is needed to break the stone to be thinner, and the thin broken stone needs more times to be sucked out, so the operation time is also not infinitely prolonged, sometimes a stone needs to be taken twice, or even a higher risk minimally invasive surgery is used to take the stone. In addition, the thin sheath tube also has another problem, because the sheath tube is thin and long, the soft mirror needs to pass through the inner diameter of the sheath tube to reach the renal pelvis, and the outer diameter size of the soft mirror is certain, so the soft mirror occupies most of the space in the thin sheath tube, and in the process of taking the stone, water is needed to be sprayed into the renal pelvis to flush the broken stone, and the water sprayed into the renal pelvis needs to flow out from the gap between the sheath tube inner diameter and the soft mirror, if the water cannot flow out in time, the pressure in the renal pelvis will be too high, and the sewage in the renal pelvis will be pressed into the human body, and if the time is long, serious postoperative complications will be caused. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at overcoming the defects of the prior art, and provides a variable-diameter bendable ureter guide sheath tube, which can better control the intrarenal pressure, is convenient to control the negative pressure, and improves the operation efficiency.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0006] A variable-diameter flexible ureteral guiding sheath includes a sheath body, a head fixing tube at the front end of the sheath body, and a sheath extending forward away from the sheath body within the head fixing tube; the sheath is provided with a variable-diameter section, with a variable-diameter starting point at the end of the variable-diameter section away from the head fixing tube and a variable-diameter ending point at the end of the variable-diameter section close to the head fixing tube, the variable-diameter starting point being located at the front of the sheath away from the head fixing tube and the variable-diameter ending point being located at the rear of the sheath close to the head fixing tube.

[0007] The diameter of the variable diameter section gradually increases from the starting point of the variable diameter section to the ending point of the variable diameter section, with the diameter at the starting point of the variable diameter section being less than the diameter at the ending point of the variable diameter section.

[0008] The sheath has a curved section at the head end away from the head fixation tube;

[0009] A laterally extending negative pressure tube is provided on one side of the sheath, and a laterally extending pressure measuring tube is provided on the other side of the sheath away from the negative pressure tube.

[0010] A through pressure relief hole is provided on the side wall of the negative pressure connector, and matching symmetrical guide grooves are provided on both sides of the pressure relief hole. The guide grooves are set on the outer wall of the negative pressure connector and are parallel to the axis of the negative pressure connector.

[0011] Furthermore, in some embodiments, the starting point of the diameter change section is located at the end of the sheath tube away from the head fixing tube, and the starting point of the diameter change is flush with the top of the sheath tube away from the head fixing tube; the ending point of the diameter change section is located at the tail end of the sheath tube near the head fixing tube, and the ending point of the diameter change is located adjacent to the head fixing tube.

[0012] Furthermore, in some embodiments, the curved section is provided with a gradual transition section, and the end of the gradual transition section away from the head fixing tube is provided with a forward-extending ultra-soft section, and the end of the ultra-soft section away from the gradual transition section is provided with a forward-extending head reinforcement section.

[0013] The curved section includes a gradually transitioning section, an ultra-soft section, and a head-reinforcing section arranged sequentially.

[0014] Gradient transition section hardness: PEBAX hardness Shore 42-47D;

[0015] Ultra-soft segment hardness: PEBAX Shore 23-28D;

[0016] Head reinforcement section hardness: PEBAX Shore 42-47D.

[0017] Furthermore, in some embodiments, the starting point of the diameter change section is located at one end of the curved section near the head fixing tube, and the starting point of the diameter change is adjacent to the gradual transition section on the curved section; the ending point of the diameter change section is located at the tail end of the sheath near the head fixing tube, and the ending point of the diameter change is adjacent to the head fixing tube.

[0018] Further, in some embodiments, the variable-diameter starting point of the variable-diameter section is arranged at one end of the curved section close to the head fixed tube, and the variable-diameter starting point is arranged adjacent to the gradual transition section on the curved section; the variable-diameter ending point of the variable-diameter section is arranged close to the head fixed tube, and a constant-diameter section is arranged between the variable-diameter ending point and the head fixed tube, and the variable-diameter section is connected to the head fixed tube through the constant-diameter section.

[0019] Further, in some embodiments, one side of the pressure relief hole is provided with a negative pressure cover piece capable of covering the pressure relief hole, the negative pressure cover piece is arranged on the outer side of the negative pressure connecting pipe, the negative pressure cover piece is semi-shell-shaped, and both side end portions of the negative pressure cover piece are provided with inner convex clamping strips matched with the guide grooves, and the inner convex clamping strips are clamped and arranged in the guide grooves.

[0020] Both ends of the guide groove are provided with positioning convex seats protruding into the groove, and both side end faces of the negative pressure cover piece are provided with positioning grooves matched with the positioning convex seats, and the positioning grooves are arranged at both ends of the side away from the pressure relief hole of the inner convex clamping strip.

[0021] The sum of the length of the pressure relief hole and the length of the negative pressure cover piece is less than or equal to the length of the guide groove.

[0022] Further, in some embodiments, the positioning grooves are arranged at both ends of the side of the inner convex clamping strip away from the pressure relief hole, the positioning grooves are clamped and arranged on the positioning convex seats in a slidable manner, and the outer wall of the negative pressure cover piece is provided with a plurality of anti-skid ribs.

[0023] The included angle between the negative pressure connecting pipe and the head fixed tube is an obtuse angle, and the included angle between the pressure measuring pipe and the head fixed tube is an obtuse angle.

[0024] The included angle between the pressure measuring pipe and the negative pressure connecting pipe is approximately a right angle.

[0025] Further, in some embodiments, the sheath tube comprises a PTFE inner liner as an inner layer, the outer wall of the PTFE inner liner is provided with a wound woven spring layer, and the outer side of the woven spring layer is provided with a PEBAX outer layer covering the woven spring layer.

[0026] The PEBAX outer layer and the woven spring layer are provided with a pressure measuring PI pipe penetrating through the sheath tube, the front end of the pressure measuring PI pipe is arranged on the head end side wall of the sheath tube, and the rear end of the pressure measuring PI pipe is arranged in the pressure measuring pipe after extending through the sheath cavity.

[0027] Further, in some embodiments, the inner tube of the pressure measuring pipe close to one end of the sheath body is provided with a sealing glue, the rear end of the pressure measuring PI pipe is arranged in the pressure measuring pipe after penetrating through the sealing glue, and the pressure measuring PI pipe and the pressure measuring pipe are connected in penetration.

[0028] The end of the pressure measuring pipe away from the sheath body is provided with an A luer connector, the other end of the A luer connector away from the pressure measuring pipe is provided with an air filter, and the A luer connector and the air filter are connected through a connecting hose.

[0029] Furthermore, in some embodiments, the air filter has a B Luer connector at the other end away from the A Luer connector, and the B Luer connector is connected to the air filter via another connecting hose; a filter membrane is disposed in the middle of the air filter, and the filter membrane is sandwiched in the upper and lower housings of the air filter;

[0030] A silicone cap is provided at the rear end of the sheath body away from the head fixing tube. The silicone cap covers the opening at the rear end of the sheath body, and a through insertion hole is provided in the middle of the silicone cap.

[0031] The variable-diameter guiding sheath of this invention ensures smoother negative pressure aspiration. By making the front end of the sheath (the ureter section) thinner and the rear end (the section from the urethral opening to the bladder) thicker, the operation time can be significantly improved, and the intrarenal pressure can be better controlled. Because the thinner and shorter tube allows for better water return, the surgical risk is significantly reduced. The thinner and shorter tube (with the rear end thicker) also greatly improves the efficiency of stone suction and shortens the operation time.

[0032] This invention features a variable-diameter guide sheath used in conjunction with an endoscope. The guide sheath's negative pressure switch is easily controlled; during surgery, the pressure relief hole can be quickly and conveniently controlled simply by covering it with a negative pressure cover (or pressing it with the thumb). The negative pressure index is displayed intuitively, facilitating pressure adjustment and improving surgical efficiency. This invention includes a pressure measuring channel (pressure measuring tube) for real-time monitoring of the pressure at the patient's affected area during surgery. This allows medical staff to more accurately control the negative pressure based on the real-time pressure at the patient's affected area, preventing excessive pressure from causing patient injury. This invention uses negative pressure suction to remove stones, thereby achieving the goal of thoroughly cleaning up stone fragments (kidney stones) and improving the removal rate of stones and other foreign objects. Attached Figure Description

[0033] Figure 1 This is a perspective view of an embodiment of this application;

[0034] Figure 2 This is a schematic diagram of the sheath portion in an embodiment of this application;

[0035] Figure 3 This is a cross-sectional structural diagram of an embodiment of this application;

[0036] Figure 4 This is a schematic diagram of the structure of an embodiment of this application;

[0037] Figure 5 This is a schematic diagram of the air filter portion in an embodiment of this application;

[0038] Figure 6 This is an application diagram illustrating an embodiment of this application;

[0039] Figure 7 This is a schematic diagram of the structure of several embodiments of the variable diameter section of this application;

[0040] Figure 8 For Figure 7 Structure diagram of A part.

[0041] Explanation of reference signs:

[0042] Sheath 11, head fixing tube 12, silica gel cap 14, jack 15, pressure measuring tube 16, sealing glue 17, variable diameter starting point 18, variable diameter ending point 19, negative pressure connecting pipe 21, pressure relief hole 22, guide groove 23, positioning boss 24, negative pressure cover 25, anti-skid rib 26, inner convex clamping strip 27, positioning groove 28, constant diameter section 29, A luer connector 31, connecting hose 32, air filter 33, B luer connector 34, filter membrane 35, variable diameter section 36, gradual transition section 37, super-soft section 38, head reinforcement section 39, sheath tube 41, curved section 42, PEBAX outer layer 43, braided spring layer 44, PTFE inner liner 45, pressure measuring PI tube 46, nephroscopic 48, scope tube 49. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical scheme and advantages of the utility model clearer, the following will combine the specific embodiments of the utility model and the corresponding drawings to clearly and completely describe the technical scheme of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0044] In the description of the utility model, it needs to be explained that the orientation or position relationship indicated by the terms "transverse", "transverse", "upper", "lower", "front", "rear", "inner", "outer" and the like is the orientation or position relationship based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. In the description of the utility model, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0045] Referring to the drawings, the application comprises: a sheath body 11 with a cavity, a head fixing tube 12 is arranged at the front end of the sheath body 11, a silica gel sealing cap 14 is arranged at the rear end of the sheath body 11 away from the head fixing tube 12, the silica gel sealing cap 14 covers the opening at the rear end of the sheath body 11, and a through insertion hole 15 is arranged in the middle of the silica gel sealing cap 14; a negative pressure connecting pipe 21 extending laterally is arranged on one side of the sheath body 11, and the included angle between the negative pressure connecting pipe 21 and the head fixing tube 12 is obtuse; a pressure measuring pipe 16 extending laterally is arranged on the other side of the sheath body 11 away from the negative pressure connecting pipe 21, and the included angle between the pressure measuring pipe 16 and the head fixing tube 12 is obtuse.

[0046] Further, the included angle between the pressure measuring pipe 16 and the negative pressure connecting pipe 21 is approximately (close to) a right angle.

[0047] A variable diameter section 36 is arranged on the sheath pipe 41, one end of the variable diameter section 36 away from the head fixing tube 12 is provided with a variable diameter starting point 18, and the other end of the variable diameter section 36 close to the head fixing tube 12 is provided with a variable diameter ending point 19, the variable diameter starting point 18 is arranged at the front part of the sheath pipe 41 away from the head fixing tube 12, and the variable diameter ending point 19 is arranged at the rear part of the sheath pipe 41 close to the head fixing tube 12; the diameter of the variable diameter section 36 gradually increases from the variable diameter starting point 18 to the variable diameter ending point 19, and the diameter of the variable diameter starting point 18 is smaller than that of the variable diameter ending point 19; a bending section 42 is arranged at the head end of the sheath pipe 41 away from the head fixing tube 12.

[0048] The bending section 42 is provided with a gradual transition section 37, one end of the gradual transition section 37 away from the head fixing tube 12 is provided with a forwardly extending super-soft section 38, and the other end of the super-soft section 38 away from the gradual transition section 37 is provided with a forwardly extending head reinforcing section 39.

[0049] The bending section 42 comprises the gradual transition section 37, the super-soft section 38 and the head reinforcing section 39 arranged in sequence.

[0050] The hardness of the gradual transition section 13 is PEBAX hardness Shore 42-47D;

[0051] The hardness of the super-soft section 38 is PEBAX hardness Shore 23-28D;

[0052] The hardness of the head reinforcing section 39 is PEBAX hardness Shore 42-47D.

[0053] Referring to Figure 7 The schematic diagram of the variable diameter section 36 in some embodiments;

[0054] In the embodiment I, the variable diameter section 36 is arranged at the head: the variable diameter starting point 18 of the variable diameter section 36 is arranged at the one end of the sheath pipe 41 away from the head fixing tube 12, and the variable diameter starting point 18 is flush with the top end of the sheath pipe 41 away from the head fixing tube 12; the variable diameter ending point 19 of the variable diameter section 36 is arranged at the tail end of the sheath pipe 41 close to the head fixing tube 12, and the variable diameter ending point 19 is arranged close to the head fixing tube 12.

[0055] In the second embodiment, the diameter of the straight section starts to change: the diameter change starting point 18 of the diameter change section 36 is arranged at one end of the bending section 42 close to the head fixed tube 12, and the diameter change starting point 18 is arranged next to the gradual transition section 37 on the bending section 42, that is, the one end of the bending section 42 close to the head fixed tube 12 is provided with the diameter change section 36; the diameter change ending point 19 of the diameter change section 36 is arranged at the tail end of the sheath tube 41 close to the head fixed tube 12, and the diameter change ending point 19 is arranged next to the head fixed tube 12.

[0056] The diameter change section 36 is a normal hardness section, and the PEBAX hardness of the diameter change section 36 is Shore 60-65D.

[0057] In the third embodiment, the diameter of the intermediate transition section changes: the diameter change starting point 18 of the diameter change section 36 is arranged at one end of the bending section 42 close to the head fixed tube 12, and the diameter change starting point 18 is arranged next to the gradual transition section 37 on the bending section 42, that is, the one end of the bending section 42 close to the head fixed tube 12 is provided with the diameter change section 36; the diameter change ending point 19 of the diameter change section 36 is arranged close to the head fixed tube 12, and a constant diameter section 29 is arranged between the diameter change ending point 19 and the head fixed tube 12, that is, the distance between the diameter change ending point 19 and the head fixed tube 12 is provided with the constant diameter section 29, and the diameter change section 36 is connected to the head fixed tube 12 through the constant diameter section 29.

[0058] The gradual transition section 37 is arranged next to the diameter change section 36 (normal hardness section), and the PEBAX hardness of the diameter change section 36 is Shore 60-65D.

[0059] The Fr specifications of the sheath tube 41 all refer to the inner diameter size, and 3Fr=1mm: the diameter change section 36 can be arranged as follows:

[0060] The diameter change starting point 18 is 9Fr; the diameter change ending point 19 is 10Fr, 11Fr, 12Fr, or 13Fr.

[0061] The diameter change starting point 18 is 11Fr; the diameter change ending point 19 is 12Fr, 13Fr, 14Fr, or 15Fr.

[0062] The diameter change starting point 18 is 13Fr; the diameter change ending point 19 is 14Fr or 15Fr.

[0063] Similarly, the diameter change starting point 18 can also be arranged as 10Fr, 12Fr, or 14Fr, and the inner diameter Fr of the diameter change ending point 19 is matched and arranged correspondingly.

[0064] The mirror tube head is arranged in the bending section 42, the sheath tube 41 is bent to the area to be cleaned of stones, and the stones are broken and cleaned by aligning the stones, opening the negative pressure to clean the broken stones, the broken stones are cleaned and removed through the negative pressure sheath tube 41, and the diameter change section 36 (small head and large tail) smoothly sucks out the broken stones. The bendable angle a of the bending section 42 can reach 275 degrees.

[0065] Furthermore, in one embodiment, see Appendix Figure 2 As shown, attached Figure 2 The diagram shows the structure of the sheath 41. The sheath 41 includes an inner PTFE liner 45, the outer wall of which is provided with a wound braided spring layer 44, and the outer side of the braided spring layer 44 is provided with a PEBAX outer layer 43 covering it. A pressure measuring PI tube 46 is provided between the PEBAX outer layer 43 and the braided spring layer 44, penetrating the sheath 41. The front end (opening) of the pressure measuring PI tube 46 is located on the front end (front end) side wall of the sheath 41, and the rear end of the pressure measuring PI tube 46 extends into the pressure measuring tube 16 after passing through the cavity of the sheath body 11. A sealant 17 is provided inside the tube of the pressure measuring tube 16 near the end of the sheath body 11, and the rear end (tail end) of the pressure measuring PI tube 46 passes through the sealant 17 and is placed in the pressure measuring tube 16, thus the pressure measuring PI tube 46 and the pressure measuring tube 16 are connected in a continuous manner.

[0066] Furthermore, in one embodiment, see Appendix Figure 5 As shown, attached Figure 5 The structure of the air filter 33 is shown in the figure; the end of the pressure measuring tube 16 away from the sheath 11 is provided with an A-Luer connector 31, and the other end of the A-Luer connector 31 away from the pressure measuring tube 16 is provided with an air filter 33. The A-Luer connector 31 and the air filter 33 are connected by a connecting hose 32.

[0067] The air filter 33 has a B Luer connector 34 at the other end away from the A Luer connector 31. The B Luer connector 34 is connected to the air filter 33 through another connecting hose 32. The other end of the B Luer connector 34 away from the air filter 33 is connected to a pressure measuring device. A filter membrane 35 is provided in the middle of the air filter 33. The filter membrane 35 is sandwiched in the upper and lower housings of the air filter 33.

[0068] A through pressure relief hole 22 is provided on the side wall of the negative pressure connector 21. Matching symmetrical guide grooves 23 are provided on both sides of the pressure relief hole 22. The guide grooves 23 are located on the outer wall of the negative pressure connector 21 and are parallel to the axial direction of the negative pressure connector 21. A negative pressure cover 25 is provided on one side of the pressure relief hole 22 to cover it. The negative pressure cover 25 is located on the outer side of the negative pressure connector 21. The sum of the length of the pressure relief hole 22 and the length of the negative pressure cover 25 is less than or equal to the length of the guide groove 23.

[0069] Furthermore, in one embodiment, see Appendix Figure 1 As shown, attached Figure 1The negative pressure cover sheet 25 is a half shell, and both side ends of the negative pressure cover sheet 25 are provided with inner convex clamping strips 27 matched with the guide grooves 23, and the inner convex clamping strips 27 are clamped in the guide grooves 23; both ends of the guide grooves 23 are provided with positioning convex seats 24 protruding into the grooves, and both side end faces of the negative pressure cover sheet 25 are provided with positioning grooves 28 matched with the positioning convex seats 24, and the positioning grooves 28 are arranged at both ends of the side, away from the pressure relief hole 22, of the inner convex clamping strips 27, that is, the positioning grooves 28 are arranged at both ends of the side, away from the pressure relief hole 22, of the inner convex clamping strips 27, and the positioning grooves 28 are clamped on the positioning convex seats 24 in a slidable manner, and the outer wall of the negative pressure cover sheet 25 is provided with a plurality of anti-skid ribs 26.

[0070] The PTFE lining 45 of the sheath 41 is used to increase lubricity and reduce friction, and can protect the soft mirror and make the soft mirror smoothly enter the pipeline; the PTFE lining 45 is supported by the woven spring layer 44 (SUS304 flat wire spring) and the PEBAX outer layer 43, so that the sheath 41 has the properties of compression flatness and serpentine bending; a pressure measuring PI pipe 46 (capillary polyimide pipe) is arranged between the woven spring layer 44 and the PEBAX outer layer 43; and the pressure measuring micro pipe is connected with the pressure measuring equipment end through the connecting hose 32.

[0071] In use, after the mirror tube 49 is inserted into the silica gel sealing cap 14, the outer wall of the mirror tube 49 is tightly sealed and connected with the insertion hole 15, and the mirror tube 49 is automatically sealed after being inserted into the insertion hole 15 of the silica gel sealing cap 14.

[0072] The sealing glue 17 (UV glue) fixes the pressure measuring PI pipe 46 in the inner end of the pressure measuring pipe 16, and blocks the outer end of the pressure measuring PI pipe 46 in the pressure measuring pipe 16, without affecting the connection and disconnection of the A luer connector 31; the B luer connector 34 is connected with the pressure measuring equipment, so that real-time pressure is obtained.

[0073] The air filter 33 is provided with a filter membrane 35 in the middle: the pore size of the PTFE filter membrane is less than 0.22 microns, the PTFE filter membrane 35 is clamped into the upper and lower shells of the air filter 33, and the filter blocks bacteria and water and can pass through gas, so that bacteria do not pollute the pipeline; the filter membrane allows bacteria (bacteria greater than 0.5 microns) to pass through, can pass through gas, and does not affect the gas pressure measuring function.

[0074] The outer end of the negative pressure connector 21 is connected with the negative pressure machine end, the pressure relief hole 22 on the negative pressure connector 21 is not pressed by the thumb or covered by the negative pressure cover sheet 25, the pressure relief hole 22 can enter air, and the front end of the sheath 41 is not under negative pressure. The negative pressure connector 21 is provided with a guide groove 23 arranged on both sides of the pressure relief hole 22, which is used for installing the negative pressure cover sheet 25, and the negative pressure cover sheet 25 is slid to cover the pressure relief hole 22, so that the pressure relief hole 22 is not pressed by the finger to form negative pressure, and the doctor can choose one of the two according to the clinical situation for convenient operation.

[0075] Referring to the drawingsFigure 6 As shown, the Figure 6 The application is applied (used) in the relevant structure shown in the figure; after the nephroscopy 48 finds the stone, the negative pressure is opened to suck out the stone, at this time only need to cover (or press) the pressure relief hole 22 on the negative pressure connector 21, the sheath tube 41 head will produce negative pressure in an instant, suck the stone and suck the waste liquid, then the mirror tube 49 (soft mirror) retreats along the sheath tube 41, the mirror tube 49 retreats to the negative pressure connector 21 at the inner end of the sheath body 11 (negative pressure stone and liquid discharge port), the stone is sucked away; then push the mirror (mirror tube 49) to find the stone, repeat the above action until the stone is sucked out.

[0076] The above detailed description includes reference to the accompanying drawings, which form a part of the detailed description. The drawings illustrate particular embodiments in which the application can be practiced by a person of ordinary skill in the art. These embodiments are also referred to herein as "examples." Other elements besides those explicitly described herein can also comprise a part of the examples. The present inventors also contemplate examples using any combination or permutation of the elements described herein or any other elements.

Claims

1. A variable diameter, bendable ureteral guide sheath tube comprising: The sheath body (11) is provided with a head fixing tube (12) at the front end, and a sheath tube (41) extending forward away from the sheath body (11) is arranged in the head fixing tube (12); characterized in that a variable diameter section (36) is arranged on the sheath tube (41), a variable diameter starting point (18) is arranged at one end of the variable diameter section (36) away from the head fixing tube (12), a variable diameter ending point (19) is arranged at one end of the variable diameter section (36) close to the head fixing tube (12), the variable diameter starting point (18) is arranged at the front part of the sheath tube (41) away from the head fixing tube (12), and the variable diameter starting point (18) is arranged at the rear part of the sheath tube (41) close to the head fixing tube (12); The diameter of the variable diameter section (36) gradually increases from the variable diameter starting point (18) to the variable diameter ending point (19), and the diameter of the variable diameter starting point (18) is smaller than the diameter of the variable diameter ending point (19); The head end of the sheath tube (41) away from the head fixing tube (12) is provided with a bending section (42); One side of the sheath body (11) is provided with a side extending negative pressure connecting pipe (21), and the other side of the sheath body (11) away from the negative pressure connecting pipe (21) is provided with a side extending pressure measuring pipe (16); A through pressure relief hole (22) is arranged on the side wall of the negative pressure connecting pipe (21), and matching symmetrical guide grooves (23) are arranged on both sides of the pressure relief hole (22), the guide grooves (23) are arranged on the outer wall of the negative pressure connecting pipe (21), and the guide grooves (23) are parallel to the axial direction of the negative pressure connecting pipe (21).

2. A variable diameter bendable ureteral guide sheath according to claim 1, wherein, The variable diameter starting point (18) of the variable diameter section (36) is arranged at one end of the sheath tube (41) away from the head fixing tube (12), and the variable diameter starting point (18) is flush with the top end of the sheath tube (41) away from the head fixing tube (12); the variable diameter ending point (19) of the variable diameter section (36) is arranged at the tail end of the sheath tube (41) close to the head fixing tube (12), and the variable diameter ending point (19) is arranged close to the head fixing tube (12).

3. The variable diameter, bendable ureteral guide sheath of claim 1, wherein, The bending section (42) is provided with a gradual transition section (37), one end of the gradual transition section (37) away from the head fixing tube (12) is provided with a forward extending super soft section (38), and one end of the super soft section (38) away from the gradual transition section (37) is provided with a forward extending head reinforcing section (39); The bending section (42) comprises the gradual transition section (37), the super soft section (38) and the head reinforcing section (39) arranged in sequence; The hardness of the gradual transition section (13) is PEBAX hardness Shore 42-47D; The hardness of the super soft section (38) is PEBAX hardness Shore 23-28D; The hardness of the head reinforcing section (39) is PEBAX hardness Shore 42-47D.

4. A variable diameter bendable ureteral guide sheath according to claim 3, wherein, The variable diameter starting point (18) of the variable diameter section (36) is arranged at one end of the bending section (42) close to the head fixing tube (12), and the variable diameter starting point (18) is arranged close to the gradual transition section (37) on the bending section (42); the variable diameter ending point (19) of the variable diameter section (36) is arranged at the tail end of the sheath tube (41) close to the head fixing tube (12), and the variable diameter ending point (19) is arranged close to the head fixing tube (12).

5. A variable diameter bendable ureteral guide sheath according to claim 3, wherein, The variable diameter starting point (18) of the variable diameter section (36) is arranged at one end of the curved section (42) close to the head fixing tube (12), and the variable diameter starting point (18) is arranged immediately adjacent to the gradual transition section (37) on the curved section (42); the variable diameter ending point (19) of the variable diameter section (36) is arranged close to the head fixing tube (12), and a constant diameter section (29) is arranged between the variable diameter ending point (19) and the head fixing tube (12), and the variable diameter section (36) is connected to the head fixing tube (12) through the constant diameter section (29).

6. The variable diameter, bendable ureteral guide sheath of claim 1, wherein, One side of the pressure relief hole (22) is provided with a negative pressure cover sheet (25) that can cover it, the negative pressure cover sheet (25) is arranged on the outer side of the negative pressure connecting pipe (21), the negative pressure cover sheet (25) is a half shell, and both end surfaces of the negative pressure cover sheet (25) are provided with inner convex clamping strips (27) that are matched with the guide grooves (23), and the inner convex clamping strips (27) are clamped and arranged in the guide grooves (23); Both ends of the guide groove (23) are provided with positioning convex seats (24) that protrude into the groove, and both end surfaces of the negative pressure cover sheet (25) are provided with positioning grooves (28) that are matched with the positioning convex seats (24), and the positioning grooves (28) are arranged at both ends of the side away from the negative pressure relief hole (22) of the inner convex clamping strip (27); The sum of the length of the pressure relief hole (22) and the length of the negative pressure cover sheet (25) is less than or equal to the length of the guide groove (23).

7. A variable diameter bendable ureteral guide sheath according to claim 6, wherein, The positioning grooves (28) are arranged at both ends of the side away from the negative pressure relief hole (22) of the inner convex clamping strip (27), the positioning grooves (28) are clamped and arranged on the positioning convex seats (24) in a slidable manner, and a plurality of anti-skid ribs (26) are arranged on the outer wall of the negative pressure cover sheet (25); The included angle between the negative pressure connecting pipe (21) and the head fixing tube (12) is obtuse, and the included angle between the pressure measuring pipe (16) and the head fixing tube (12) is obtuse; The included angle between the pressure measuring pipe (16) and the negative pressure connecting pipe (21) is approximately a right angle.

8. The variable diameter, bendable ureteral guide sheath of claim 1, wherein, The sheath tube (41) comprises an inner layer PTFE lining (45), the outer wall of the PTFE lining (45) is provided with a wound woven spring layer (44), and the outer side of the woven spring layer (44) is provided with a PEBAX outer layer (43) that covers it; A pressure measuring PI pipe (46) that penetrates through the sheath tube (41) is arranged between the PEBAX outer layer (43) and the woven spring layer (44), the front end of the pressure measuring PI pipe (46) is arranged on the head end side wall of the sheath tube (41), and the rear end of the pressure measuring PI pipe (46) is arranged in the pressure measuring pipe (16) after extending through the cavity of the sheath body (11).

9. A variable diameter bendable ureteral guide sheath according to claim 8, wherein, A sealing glue (17) is arranged in the tube close to one end of the sheath body (11), the rear end of the pressure measuring PI pipe (46) is arranged in the pressure measuring pipe (16) after penetrating through the sealing glue (17), and the pressure measuring PI pipe (46) is connected with the pressure measuring pipe (16) in a penetrating manner; An A luer connector (31) is arranged at one end of the pressure measuring pipe (16) away from the sheath body (11), an air filter (33) is arranged at the other end of the A luer connector (31) away from the pressure measuring pipe (16), and the A luer connector (31) and the air filter (33) are connected through a connecting hose (32).

10. A variable diameter bendable ureteral guide sheath according to claim 9, wherein, The air filter (33) is provided with a B luer joint (34) at the other end away from the A luer joint (31), and the B luer joint (34) is connected with the air filter (33) through another connecting hose (32); a filter membrane (35) is arranged in the middle of the air filter (33), and the filter membrane (35) is clamped in the upper and lower shells of the air filter (33); The sheath body (11) is provided with a silica gel sealing cap (14) at the rear end away from the head fixing tube (12), the silica gel sealing cap (14) covers the opening at the rear end of the sheath body (11), and a plug hole (15) penetrating the middle part of the silica gel sealing cap (14) is formed.

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