Vacuum suction sleeve

Abstract

A negative pressure suction sheath, characterized in that the negative pressure suction sheath comprises a sheath tube, a negative pressure port, and a dilator, wherein the negative pressure port comprises a main channel space and a negative pressure suction channel space located on one side of the main channel space, wherein a proximal end of the sheath tube is connected to a distal end of the main channel space, wherein the dilator is inserted from the proximal end of the main channel space and protrudes from the distal end of the sheath tube and is detachably connected to the main channel space; wherein a side channel opening is provided on one side of the main channel space, wherein the negative pressure suction channel space is connected to the side channel opening;wherein a pressure regulating port is further provided on the wall of the main duct space, wherein the pressure regulating port is provided corresponding to the side duct opening or at an end of the side duct opening facing away from the casing tube, wherein the negative pressure in the casing tube can be adjusted by adjusting the opening size of the pressure regulating port;

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of the medical instrument, in particular to a vacuum suction sleeve. STATE OF THE ART

[0002] Kidney stones have long been a plague for humanity. Complications caused by stones in the urethra usually require surgical intervention. Conventional surgical stone removal procedures require surgeons to cut open the patient's abdomen to remove the stone, and the patient must spend a long time in the hospital to recover.

[0003] The use of minimally invasive stone removal devices reduces patient pain and recovery time. Due to the unique anatomical structure of the kidney, it is difficult to reach the renal calyx, especially the inferior calyx, during endoscopic intrarenal surgery. Unfortunately, even if access to the calyx is obtained during surgery and the stone is removed and effectively crushed, it is still very difficult to remove the stone fragments from the calyx. This requires the patient to expel the stone fragments themselves, which prolongs treatment time and causes pain and discomfort.

[0004] Ureteral sheaths are used in urological surgery. Before clinical urological operations, the ureteral sheath is inserted into the ureter to create a surgical channel. During surgery, an endoscope, laser fiber, stone removal instrument, or the like are inserted through the surgical channel to remove some small stones from the ureteral sheath.

[0005] The existing ureteral sheath generally includes a sheath tube, a negative pressure port, a dilation tube, or the like, the sheath tube being connected to a negative pressure device via the negative pressure port, and negative pressure is used to suction and discharge the intraoperative stone crumbs and fluid. During surgery, the suction force in the sheath tube needs to be adjusted according to the pressure in the human body. However, the negative pressure device is usually provided in a location that a hand of the operator (ie, surgeon) cannot reach, such as on the wall of the operating room. Therefore, during surgery, the operator cannot leave the location to adjust the suction force in the sheath tube by adjusting the negative pressure device.

[0006] Therefore, the question of how to adjust the suction force in the sheath tube during surgery according to the pressure in the human body has become a technical problem that needs to be urgently solved in this field. CONTENTS OF THE UTILITY MODEL

[0007] To solve the aforementioned technical problem, the utility model provides a negative pressure suction sheath comprising a sheath tube, a negative pressure port, and a dilator, wherein the negative pressure port includes a main channel space and a negative pressure suction channel space located on one side of the main channel space, wherein a proximal end of the sheath tube is connected to a distal end of the main channel space, wherein the dilator is inserted from the proximal end of the main channel space and protrudes from the distal end of the sheath tube and is detachably connected to the main channel space; wherein a side channel opening is provided on one side of the main channel space, wherein the negative pressure suction channel space is connected to the side channel opening;wherein a pressure regulating port is further provided on the wall of the main duct space, wherein the pressure regulating port is provided corresponding to the side duct opening or at an end of the side duct opening facing away from the casing tube, wherein the negative pressure in the casing tube can be adjusted by adjusting the opening size of the pressure regulating port;

[0008] Optionally, the pressure regulation connection is located on an opposite side of the side channel opening.

[0009] Optionally, the pressure regulation connection is located on a vertical side of the side channel opening.

[0010] An adjustment mechanism is optionally provided on the pressure regulation connection with which the opening size of the pressure regulation connection can be adjusted.

[0011] Optionally, the adjustment mechanism is a valve or a slide, wherein the valve or the slide is movably arranged on the pressure regulating port, wherein the opening size of the pressure regulating port is adjusted by moving the valve or the slide.

[0012] Optionally, a sealing ring and a fastening element are also provided at the proximal end of the main channel space, wherein the sealing ring is sealed and fastened by the fastening element at the proximal end of the main channel space; wherein the sealing ring is provided with an inner hole such that the dilator and / or a surgical instrument which is introduced into the main channel space achieves a firm connection with the main channel space by firmly seating it on the inner hole of the sealing ring.

[0013] Optionally, in the natural state, the hole diameter of the inner hole of the sealing ring is not larger than the outer diameter of the dilator and / or the surgical instrument.

[0014] Optionally, in the natural state, the hole diameter of the inner hole of the sealing ring is larger than the outer diameter of the dilator and / or the surgical instrument, and the fastening element can adjust the degree of squeezing of the sealing ring, thereby adjusting the size of the inner hole of the sealing ring, so that the dilator and / or the surgical instrument inserted into the main canal space is firmly placed on the inner hole of the sealing ring.

[0015] Optionally, the fastener is a threaded fastener that secures the sealing ring to the proximal end of the main channel space through a threaded connection to the main channel space, whereby the degree of compression of the sealing ring can be adjusted by loosening or tightening the threaded fastener.

[0016] Optionally, the sheath tube is a single- or multi-lumen structure, with the sealing ring having one or more internal holes accordingly.

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

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

[0019] Optionally, the sheath tube is a single-layer tube or a three-layer composite tube, wherein the material of the sheath tube is a polymer material when the sheath tube is a single-layer tube; wherein the outer layer of the sheath tube is made of thermoplastic material when the sheath tube is a three-layer composite tube, wherein the intermediate layer is a coil spring or a woven metallic wire mesh structure and the inner layer is a polymer tube with a low coefficient of friction.

[0020] Compared to the prior art, the technical solution of this utility model has the following advantageous effects:

[0021] The utility model places the pressure regulating port on the main channel of the vacuum port, allowing the surgeon to adjust the suction force in the sheath tube without leaving the site. The vacuum in the sheath tube can be adjusted by simply adjusting the size of the pressure regulating port on the handheld vacuum port.

[0022] Furthermore, the utility model avoids the provision of a pressure regulating port on the sheath tube, the negative pressure suction channel space and the space wall of the main channel space at the distal end of the side channel opening, and instead provides a pressure regulating port on the corresponding side channel opening of the main channel space or on the space wall at the end of the side channel opening facing away from the sheath tube, thereby solving the technical problem of stone accumulation in the negative pressure suction channel space and clogging of the negative pressure suction channel space caused by the provision of the pressure regulating port on the negative pressure suction channel space, thereby improving the effect of negative pressure suction. BRIEF DESCRIPTION OF THE DRAWING

[0023] In order to more clearly explain the technical solutions of the embodiments of the present utility model or the prior art, the drawings necessary for the descriptions in the embodiments or the prior art are briefly described below. Obviously, the drawings in the following description are only some embodiments of the present utility model, and other drawings can be obtained from these drawings without creative effort by those skilled in the art. Fig. 1 is a schematic structural diagram of the vacuum suction sleeve provided by an embodiment of the present utility model; Fig. 2 is a schematic structural diagram of a negative pressure port provided by an embodiment of the utility model (in a closed state of the pressure regulating port); Fig. 3 is a schematic structural diagram of a negative pressure port provided by an embodiment of the utility model (in an open state of the pressure regulating port); Fig. 4 is a schematic structural diagram of the vacuum suction sleeve provided by another embodiment of the present utility model; Fig. 5 is a comparison diagram of a pressure regulating port on the opposite side of the side channel opening and the pressure regulating port on the vertical side of the side channel opening in the utility model; Fig. 6 is a schematic structural diagram for an assembly of the sealing ring provided by an embodiment of the present utility model; Fig. 7 is a comparison diagram for a sealing ring provided by an embodiment of the present utility model in a natural state and in an axially compressed state; Fig. 8 is a schematic structural diagram of the vacuum port provided by an embodiment of the present invention, which is a “W”-shaped port. DETAILED EMBODIMENTS

[0024] As described in the prior art, the current ureteral sheath generally includes a sheath tube, a negative pressure port, a dilation tube, or the like, the sheath tube being connected to a negative pressure device via the negative pressure port, and negative pressure is used to suction and discharge the intraoperative stone crumbs and fluid. During surgery, the suction force in the sheath tube needs to be adjusted according to the pressure in the human body, but the negative pressure device is usually provided in a location that a hand of the operator (ie, surgeon) cannot reach, such as the wall of the operating room. Therefore, during surgery, the operator cannot leave the location to adjust the suction force in the sheath tube by adjusting the negative pressure device.

[0025] To solve the above-mentioned technical problems, the utility model with reference to Fig. 1 to Fig. 7 a negative pressure suction sheath, wherein the negative pressure suction sheath comprises a sheath tube 1, a negative pressure port 2, and a dilator 3, wherein the negative pressure port 2 comprises a main channel space 201 and a negative pressure suction channel space 202 located on one side of the main channel space 201, wherein a proximal end of the sheath tube 1 is connected to a distal end of the main channel space 201, wherein the dilator 3 is inserted from the proximal end of the main channel space 201 and protrudes from the distal end of the sheath tube 1 and is detachably connected to the main channel space 201; wherein a side channel opening 205 is provided on one side of the main channel space 201, wherein the negative pressure suction channel space 202 is connected to the side channel opening 205;wherein a pressure regulating port 203 is further provided on the wall of the main channel space 201, wherein the pressure regulating port 203 is provided corresponding to the side channel opening 205 or at an end of the side channel opening 205 facing away from the casing tube 1, wherein the negative pressure in the casing tube 1 can be adjusted by adjusting the opening size of the pressure regulating port 203;

[0026] The utility model places the pressure regulating port 203 on the main channel space 201 of the vacuum port 2, so that the operator does not have to leave the site to adjust the vacuum device to adjust the suction force in the sheath tube 1. The negative pressure in the sheath tube 1 can be adjusted by simply adjusting the size of the pressure regulating port 203 on the handheld vacuum port 2.

[0027] The specific method for adjusting the negative pressure in the sheath tube 1 is that when the minimum negative pressure is required, the pressure regulating port 203 is kept fully open or blocked to a minimum degree. When more negative pressure is required, the pressure regulating port 203 is closed to the maximum degree of complete closure.

[0028] The utility model does not impose any particular restrictions on the size adjustment method of the pressure regulating port 203, for example, the size of the pressure regulating port 203 may be adjusted by pressing the pressure regulating port 203 with a finger; and an adjustment mechanism 204 may be further provided on the pressure regulating port 203, the size of the pressure regulating port 203 being adjusted by the manual adjustment mechanism 204.

[0029] In this technical field, the negative pressure port 2 generally has a Y-shaped structure including a main passage space 201 and a negative pressure suction passage space 202 located on the side of the main passage space 201, and the negative pressure suction passage space 202 is connected to the negative pressure device. Therefore, a negative pressure suction air path is formed between the negative pressure suction passage space 202 and the sheath tube 1, thereby sucking the stone crumbs in the human body out of the human body. The negative pressure suction passage space 202 is located on the negative pressure suction air path and is connected to the negative pressure device. Therefore, it is easily conceivable for those skilled in the art to install a pressure regulating port on the space wall of the negative pressure suction passage space 202, and the negative pressure is adjusted by adjusting the size of the pressure regulating port.However, the method of providing a pressure regulating port at the negative pressure suction channel space 202 destroys the integrity of the space wall of the negative pressure suction channel space 202. Therefore, when the pressure regulating port is in a fully or partially open state, the stone chips can easily be discharged from the pressure regulating port when being discharged to the outside through the negative pressure suction channel space 202. If the stone chips are not smaller than the opening diameter of the pressure regulating port, or if multiple stone chips accumulate at the pressure regulating port and are discharged from the pressure regulating port, they are likely to stick to the pressure regulating port and thus easily block the discharge of other stone chips from the negative pressure suction channel space 202.Over time, more and more stone crumbs accumulate in the negative pressure suction channel space 202 and clog the negative pressure suction channel space 202, then the stone crumbs in the body can no longer be removed from the negative pressure suction channel space 202.

[0030] In order to solve the above-mentioned technical problems, the utility model avoids the provision of a pressure regulating port 203 on the sheath tube 1, the negative pressure suction channel space 202 and the space wall of the main channel space 201 at the distal end of the side channel opening 205, and instead provides a pressure regulating port 203 on the corresponding side channel opening 205 of the main channel space 201 or on the space wall at the end of the side channel opening 205 remote from the sheath tube 1, thereby solving the technical problem of stone accumulation in the negative pressure suction channel space and clogging of the negative pressure suction channel space caused by the provision of the pressure regulating port on the negative pressure suction channel space, thereby improving the effect of negative pressure suction.

[0031] In the following, the technical solutions in the embodiments of the present utility model will be described clearly and completely with reference to the drawings. Obviously, the described embodiments are only some of the embodiments of the present utility model, not all of them. All other embodiments that a person skilled in the art can derive from the embodiments in the present utility model without creative effort are within the scope of protection of the present utility model.

[0032] An embodiment of the utility model provides a negative pressure suction sheath consisting of a sheath tube 1, a negative pressure port 2, and a dilator 3, wherein the negative pressure port 2 comprises a main channel space 201 and a negative pressure suction channel space 202 located on one side of the main channel space 201, wherein the proximal end of the sheath tube 1 is connected to the distal end of the main channel space 201, wherein the dilator 3 is inserted from the proximal end of the main channel space 201 and protrudes from the distal end of the sheath tube 1 and is detachably connected to the main channel space 201; wherein a side channel opening 205 is provided on one side of the main channel space 201, wherein the negative pressure suction channel space 202 is connected to the side channel opening 205.

[0033] The utility model does not impose any particular restrictions on the angle between the negative pressure suction channel space 202 and the main channel space 201, with the negative pressure suction channel space 202 extending outward from the outer surface of the main channel space 201 and forming an angle with the proximal main channel space 201 in a range from greater than 0° to less than 180°. In one embodiment, the negative pressure suction channel space 202 extends outward from the outer surface of the main channel space 201 and toward the proximal end of the main channel space 201, that is, an acute angle, for example, 25° to 45°, is formed between the negative pressure suction channel space 202 and the proximal portion of the main channel space 201 to facilitate the effective removal of stones or other foreign bodies.

[0034] The present utility model is not specifically limited to whether the axis of the negative pressure suction channel space 202 intersects the axis of the main channel space 201. As one embodiment, it is provided that the axis of the negative pressure suction channel space 202 intersects the axis of the main channel space 201.

[0035] As one embodiment, a pressure regulating port 203 is provided on the space wall of the main channel space 201, wherein the pressure regulating port 203 is arranged corresponding to the side channel opening 205, that is, the pressure regulating port 203 is located on the opposite side or next to the side channel opening 205.

[0036] With reference to Fig. 1 to Fig. 3 and the left diagram in Fig. 5, shows the left diagram in Fig. 5, the pressure regulating port 203 is located on the opposite side of the side channel opening 205. As a specific embodiment, the pressure regulating port 203 is located on the opposite side of the side channel opening 205, that is, the space wall of the main channel space 201 is provided with a pressure regulating port 203 at a position opposite the side channel opening 205. Therefore, the side channel opening 205 and the pressure regulating port 203 can easily form a "draft" gas convection, and the negative pressure suction effect can be enhanced by utilizing the "draft" convection amplification principle. The moment the pressure regulating port 203 is closed, the negative pressure suction force can be rapidly increased, and the stone crumbs can be efficiently sucked out, thereby improving the suction efficiency.If the negative pressure suction force is low, multiple suctions are required to remove the stone crumbs, which increases the suction time and increases the patient's pain.

[0037] With reference to Fig. 4 and the right diagram in Fig. 5, shows the right diagram in Fig. 5, the pressure regulating port 203 is located on the vertical side of the side channel opening 205. As a second specific embodiment, the pressure regulating port 203 is located on the vertical side of the side channel opening 205, that is, the perpendicular line from the pressure regulating port 203' to the axis of the main channel space 201 is perpendicular to the perpendicular line from the side channel opening 205 to the axis of the main channel space 201. In other words, the pressure regulating port 203' lies on a perpendicular line to plane a, in which the axis of the main channel space 201 and the axis of the negative pressure suction channel space 202 are located. From an ergonomic point of view, the hand holding the suction sleeve holds the negative pressure suction channel space 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 (surgeon) to operate and reduces the operator's fatigue.

[0038] As a third specific embodiment, the pressure regulating port 203 is located on an end of the side channel opening 205 remote from the sheath tube 1, therefore, the pressure regulating port 203 bypasses the negative pressure suction air path formed between the negative pressure suction channel space 202 and the sheath tube 1, thereby solving the technical problem of stone accumulation in the negative pressure suction channel space 202 and clogging of the negative pressure suction channel space 202 caused by the provision of the pressure regulating port 203 at the negative pressure suction channel space 202, thereby improving the effect of negative pressure suction.

[0039] In the current technology, when negative pressure suction is required, the surgeon must always press the pressure regulating port 203 with his finger to maintain a sealed state, which may cause the surgeon to become fatigued during prolonged operation. This also affects the surgical procedure. For example, if the surgeon's dominant hand is the right hand, existing soft endoscope surgery requires the surgeon to hold the endoscope with the right hand and fix the soft endoscope sheath with the left hand. Once the fingers of the left hand press the pressure regulating port, the soft endoscope sheath inevitably cannot be fixed, causing the soft endoscope sheath to move and affecting stone removal with the endoscope held.To solve this technical problem, the utility model provides an adjustment mechanism 204 on the pressure regulating port 203, which allows the opening size to be adjusted. While holding the suction sleeve with his left hand, the surgeon can use his thumb to move the adjustment mechanism 204 to the desired position without having to constantly press the pressure regulating port 203 with his fingers.

[0040] In one embodiment, it is provided that the adjustment mechanism 204 is a valve or a slide, wherein the valve or the slide is movably arranged on the pressure regulating port 203, wherein the opening size of the pressure regulating port 203 is adjusted by moving the valve or the slide.

[0041] With reference to Fig. 6, in one embodiment, a sealing ring 4 and a fastening element are also provided at the proximal end of the main channel space 201, wherein the sealing ring 4 is sealed and fastened by the fastening element at the proximal end of the main channel space 201, thereby achieving the seal at the proximal end of the main channel space 201 and ensuring the negative pressure seal. The sealing ring 4 is provided with an inner hole such that the dilator 3 and / or the surgical instrument inserted into the main channel space 201 achieves a firm connection with the main channel space 201 by firmly seating it on the inner hole of the sealing ring 4.

[0042] This embodiment does not limit the fastening connection method between the fastening element and the proximal end of the main channel space 201. For example, it may be a detachable or non-detachable fastening method, such as a snap connection or a threaded connection. To facilitate the replacement of the sealing ring 4, the fastening element is preferably detachably connected to the main channel space 201.

[0043] In the natural state, when the inner hole diameter of the sealing ring 4 is not larger than the outer diameter of the dilator 3 and / or the surgical instrument, the dilator 3 and / or the surgical instrument can be firmly connected to the sealing ring 4 by directly inserting it into the inner hole of the sealing ring 4.

[0044] In the natural state, when the inner hole diameter of the sealing ring 4 is larger than the outer diameter of the dilator 3 and / or the surgical instrument, it is necessary to adjust the degree of squeezing of the sealing ring 4 by the fastening member, thereby adjusting the inner hole size of the sealing ring 4 so that the dilator 3 and / or the surgical instrument inserted into the main channel space 201 is firmly fitted onto the inner hole of the sealing ring 4.

[0045] The tight fitting described above consists in that the sealing ring 4 is placed through the inner hole onto the dilator 3 and / or the surgical instrument, wherein there is no gap between the sealing ring 4 and the outer circumference of the dilator 3 and / or the surgical instrument.

[0046] As one embodiment, it is provided that the fastening element is a threaded fastening element 5, wherein the threaded fastening element 5 fastens the sealing ring 4 to the proximal end of the main channel space 201 by a threaded connection with the main channel space 201; wherein the sealing ring 4 is provided with an inner hole, wherein by loosening or tightening the threaded fastening element 5, the degree of crimping of the sealing ring 4 can be adjusted, thereby adjusting the size of the inner hole of the sealing ring 4, so that the dilator 3 and / or the surgical instrument inserted into the main channel space 201 achieves a firm connection with the main channel space 201 by firmly seating it on the inner hole of the sealing ring 4.

[0047] In its natural state, the thickness of the sealing ring 4 is L1. When the hole diameter d1 of the inner hole of the sealing ring 4 is not smaller than the outer diameter of the dilator 3 and / or the surgical instrument, the dilator 3 and / or the surgical instrument can easily penetrate through the inner hole of the sealing ring 4 and into the sheath tube 1. By tightening the threaded fastener 5, the sealing ring 4 is axially squeezed by its thread. After the sealing ring 4 is deformed by axial squeezing, the thickness L2 is L1 > L2; and the inner diameter of the sealing ring 4 is reduced to d2, where d2 < d1.Therefore, the sealing ring 4 firmly holds the dilator 3 and / or the surgical instrument through the inner hole, allowing the axial position of the dilator 3 and / or the surgical instrument to be controlled to prevent displacement and a closed state to ensure negative pressure sealing. Conversely, by loosening the threaded fastener 5 to release the axially compressed state of the sealing ring 4, the hole diameter of the inner hole is returned to its natural state, allowing the dilator 3 and / or the surgical instrument to be moved.

[0048] In the natural state, when the hole diameter of the inner hole of the sealing ring 4 is smaller than the outer diameter of the dilator 3 and / or the surgical instrument, the dilator 3 and / or the surgical instrument can be tightly connected to the sealing ring 4 without squeezing the sealing ring 4.

[0049] The present embodiment does not limit the specific type of surgical instrument, which may 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 ring 4. By tightening the threaded fastener 5, the dilator 3 and the negative pressure port 2 are firmly connected to each other. After the sheath tube 1 and the dilator 3 attached to the negative pressure port 2 are inserted into the human body, the threaded fastener 5 is loosened and the dilator 3 is withdrawn, and the endoscope 6 is inserted into the sheath tube 1 through the inner hole of the sealing ring 4, and the threaded fastener 5 is tightened to firmly connect the endoscope and the negative pressure port 2.When the endoscope 6 needs to be moved, the threaded fastener 5 is loosened by screwing, allowing the endoscope 6 to be moved for diagnosis and treatment. Since the sealing ring 4 has a variable hole diameter of the inner hole, it can be suitable for dilators 3 and endoscopes 6 of different sizes.

[0050] In the present embodiment, small stone fragments may enter the space between the endoscope and the sheath tube 1 and eventually be discharged through the negative pressure suction channel space 202. When the stone fragments are large but still small enough to fit into the sheath tube 1, the endoscope may be retracted to a position exactly near the distal end of the negative pressure suction channel space 202, whereby the stone fragments can be successively suctioned from the sheath tube 1 and the negative pressure suction channel space 202.

[0051] In the present embodiment, there is no limitation on the number of inner holes of the sealing ring 4, which can be determined according to the internal structure of the sheath tube 1. When the sheath tube 1 has a single-lumen structure, the sealing ring 4 has a single inner hole; when the sheath tube 1 has a multi-lumen structure, the sealing ring 4 has a plurality of inner holes.

[0052] The present utility model does not limit the specific structure of the threaded fastener 5 that fixes the sealing ring 4 to the proximal end of the main channel space 201.As one embodiment, the threaded fastening element 5 comprises a sleeve structure 501, wherein the sleeve structure 501 is arranged coaxially with the main channel space 201 and the proximal end of the main channel space 201 is provided with an external thread, wherein 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 an internal thread adapted to the external thread, wherein the sleeve structure 501 is screwed to the external thread of the main channel space 201 via its internal thread; wherein the proximal end of the sleeve structure 501 is provided with a cover 502, wherein the cover 502 is provided with a through-hole corresponding to the inner hole of the sealing ring 4, wherein the dilator 3 and / or the surgical instrument are inserted sequentially into the sheath tube 1 through the through-hole of the cover 502 and the inner hole of the sealing ring 4.The outer diameter of the sealing ring 4 is larger than the inner diameter of the proximal end of the main channel space 201 and larger than the through hole of the cover 502. Therefore, when the sealing ring 4 is fastened to the proximal end of the main channel space 201 by the threaded fastener 5, the proximal end surface of the main channel space 201, located on both sides of the sealing ring 4, and the cover 502 simultaneously compress the sealing ring 4. While the sealing ring 4 holds the dilator 3 and / or the surgical instrument, it also seals the through hole of the cover 502 to achieve the proximal seal of the main channel space 201, thereby ensuring a negative pressure seal.

[0053] In the prior art, the sheath tube 1 is relatively hard throughout and cannot bend with the bending of the soft endoscope, making it difficult to reach certain parts of the human body, such as the kidneys. Therefore, the stones in these parts cannot be removed by negative pressure suction. Instead, the stones must be grasped by inserting an instrument such as a stone removal basket into the sheath tube 1, which causes pain and an economic burden for the patient. To solve this technical problem, the sheath tube 1 of the present embodiment may be provided with a flexible structure at its head end 101 (i.e., distal end), thereby improving the efficiency of stone removal by negative pressure, reducing the use of instruments such as a stone removal basket, and reducing the financial burden on patients.The 5 to 15 cm section at the head end of the sheath tube 1 has a different hardness than the rear section, which allows the head end to bend passively when the endoscope is bent, so that it can reach the renal pelvis and renal calyx, directly pick up the stone crumbs and suction them out of the body.

[0054] The tip of the dilator 3 is designed to be soft to prevent damage during insertion. The 10 to 40 cm section of the head end of the dilator 3, which includes a tapered section, is designed to have a different hardness than the main section. This allows it to easily pass through the soft head section and over the convolutions of narrow or convoluted human body canals, thus avoiding mucosal puncture or rupture of the ureter, thus improving insertion safety.

[0055] The main body of the dilator 3 is made of high-molecular-weight materials such as polyethylene and polypropylene, which have suitable hardness and consider both passability and supportability during insertion. The dilator 3 can be designed as a single-lumen or multi-lumen structure, with the first space channel serving to pass a guidewire, and the second or subsequent channels serving to infuse fluids or pass visualization and observation instruments and other diagnostic and treatment instruments. The dilator handle is typically made of a polymer material such as polypropylene, which has suitable hardness and a certain degree of deformation resistance and is easy to assemble and disassemble with the negative pressure port 2.

[0056] The sheath tube 1 is a three-layer composite tube. The outer layer is made of thermoplastic materials such as nylon, which have good softness and hardness, so that the tube body has good support and toughness. The intermediate layer is composed of a coiled spring or a woven metal wire mesh structure, which makes the tube body have good bending strength and support, ensuring the stability of the channel. A polymer tube with a low friction coefficient, such as Teflon, is often used for the inner layer, which provides good surface smoothness or permeability to the lumen, reduces the insertion and withdrawal resistance of the endoscope and surgical instrument, and simultaneously protects the instrument.

[0057] The sheath tube 1 can be single-lumen or multi-lumen, wherein the first space channel serves to pass through the dilator 3 and the endoscopic stone removal instrument, wherein the second space channel serves to pass through the safety guide wire or other diagnostic and treatment instruments.

[0058] The utility model is applicable to a specific part of the human body, namely, the negative pressure suction sheath for suctioning and draining intraoperative stone fragments and / or fluid through negative pressure. Therefore, the size of the sheath tube 1 is not limited by the utility model and can be customized according to actual usage requirements. For example, the negative pressure suction sheath is used for the treatment of ureteral stones, kidney stones, gallstones, and the like. The inner diameter of the sheath tube is 18 to 16 French, the outer diameter is 10 to 18 French, and the effective length is 10 to 60 cm. In use, the sheath tube 1 is inserted into the human body, and the negative pressure port 2 is located outside the human body.

[0059] The negative pressure port is often made of transparent polymer materials such as polycarbonate, which facilitates visual observation of the retraction distance during endoscopic stone removal, the negative pressure suction effect, and stone evacuation. The main channel space 201 of the negative pressure port 2 is funnel-shaped and gradually thickens, with the connecting port of the sheath tube 1 being a thin port and the inlet and outlet ports of the endoscope being thick ports. The end of the endoscope is provided 2Fr larger than the end of the sheath tube 1 to improve the guiding ability of the endoscope during insertion and removal of the endoscope. The negative pressure port 2 may be a Y-shaped port, that is, a negative pressure suction channel space 202 is provided on one side of the main channel space 201 to realize negative pressure suction. With reference to Fig.8, the negative pressure port 2 can also be a W-shaped port, meaning that in addition to the negative pressure suction channel space 202, a side channel 206 or even multiple side channels 206 can be provided on the side of the main channel 201 for infusing contrast media or introducing other instruments, such as pressure / temperature measuring catheters. The inner diameter of the negative pressure suction channel space 202 is not smaller than the inner diameter of the sheath tube 1 to ensure that the suction power of the negative pressure suction channel space 202 is not less than the suction power of the main channel.

[0060] The vacuum suction channel space 202 is connected to a main pipe, the other end of which is connected to a collecting tank, one end of an auxiliary pipe is connected to the collecting tank, and the other end of the auxiliary pipe is connected to the vacuum device, the vacuum device being activated to remove the stone crumbs of the fabric.

[0061] In summary, the utility model places the pressure regulating port 203 on the main channel space 201 of the vacuum port 2, so that the operator does not have to leave the site to adjust the vacuum device to adjust the suction force in the sheath tube 1. The negative pressure in the sheath tube 1 can be adjusted by simply adjusting the size of the pressure regulating port 203 on the handheld vacuum port 2.

[0062] Furthermore, the utility model avoids the provision of a pressure regulating port 203 on the sheath tube 1, the negative pressure suction channel space 202 and the space wall of the main channel space 201 at the distal end of the side channel opening 205, and instead provides a pressure regulating port 203 on the corresponding side channel opening 205 of the main channel space 201 or on the space wall at the end of the side channel opening 205 remote from the sheath tube 1, thereby solving the technical problem of stone accumulation in the negative pressure suction channel space 202 and clogging of the negative pressure suction channel space 202 caused by the provision of the pressure regulating port 203 on the negative pressure suction channel space 202, thereby improving the effect of negative pressure suction.

[0063] Although the present utility model is disclosed as above, it is not limited thereto. Any person skilled in the art may make various changes and modifications without departing from the spirit and scope of the present utility model. Therefore, the scope of protection of the present utility model is determined by the scope defined in the claims.

Claims

[1] Vacuum suction sleeve, characterized bythat the negative pressure suction sheath comprises a sheath tube, a negative pressure port, and a dilator, wherein the negative pressure port comprises a main channel space and a negative pressure suction channel space located on one side of the main channel space, wherein a proximal end of the sheath tube is connected to a distal end of the main channel space, wherein the dilator is inserted from the proximal end of the main channel space and protrudes from the distal end of the sheath tube and is detachably connected to the main channel space; wherein a side channel opening is provided on one side of the main channel space, wherein the negative pressure suction channel space is connected to the side channel opening;wherein a pressure regulating port is further provided on the wall of the main duct space, wherein the pressure regulating port is provided corresponding to the side duct opening or at an end of the side duct opening facing away from the casing tube, wherein the negative pressure in the casing tube can be adjusted by adjusting the opening size of the pressure regulating port; [2] Vacuum suction sleeve according to claim 1, characterized by that the pressure regulation connection is located on an opposite side of the side channel opening. [3] Vacuum suction sleeve according to claim 1, characterized by that the pressure regulation connection is located on a vertical side of the side channel opening. [4] Vacuum suction sleeve according to claim 1, characterized by that an adjustment mechanism is provided on the pressure regulating port with which the opening size of the pressure regulating port can be adjusted. [5] Vacuum suction sleeve according to claim 4, characterized by that the adjustment mechanism is a valve or a slide, wherein the valve or the slide is movably arranged on the pressure regulating port, wherein the opening size of the pressure regulating port is adjusted by moving the valve or the slide. [6] Vacuum suction sleeve according to claim 1, characterized by that a sealing ring and a fastening element are also provided at the proximal end of the main channel space, wherein the sealing ring is sealed and fastened by the fastening element at the proximal end of the main channel space; wherein the sealing ring is provided with an inner hole such that the dilator and / or a surgical instrument which is introduced into the main channel space achieves a firm connection with the main channel space by firmly seating it on the inner hole of the sealing ring. [7] Vacuum suction sleeve according to claim 6, characterized bythat in its natural state the diameter of the inner hole of the sealing ring is not larger than the outer diameter of the dilator and / or the surgical instrument. [8] Vacuum suction sleeve according to claim 6, characterized by that in the natural state the hole diameter of the inner hole of the sealing ring is larger than the outer diameter of the dilator and / or the surgical instrument, wherein the fastening element can be used to adjust the degree of squeezing of the sealing ring, thereby adjusting the size of the inner hole of the sealing ring, so that the dilator and / or the surgical instrument which is inserted into the main canal space is firmly placed on the inner hole of the sealing ring. [9] Vacuum suction sleeve according to one of claims 6 to 8, characterized bythat the fastening element is a threaded fastener which secures the sealing ring at the proximal end of the main channel space by a threaded connection to the main channel space, wherein the degree of compression of the sealing ring can be adjusted by loosening or tightening the threaded fastener. [10] Vacuum suction sleeve according to claim 6, characterized by that the sheath tube is a single- or multi-lumen structure, whereby the sealing ring has one or more internal holes. [11] Vacuum suction sleeve according to claim 6, characterized by that the surgical instrument includes an endoscope. [12] Vacuum suction sleeve according to claim 1, characterized by that a head end of the sheath tube is a flexible structure. [13] Vacuum suction sleeve according to claim 1, characterized bythat the sheath tube is a single-layer tube or a three-layer composite tube, wherein the material of the sheath tube is a polymer material when the sheath tube is a single-layer tube; wherein the outer layer of the sheath tube is made of thermoplastic material when the sheath tube is a three-layer composite pipe, wherein the intermediate layer is a coil spring or a woven metallic wire mesh structure and the inner layer is a polymer tube with a low coefficient of friction.

Images