Negative pressure suction sheath

Abstract

The invention provides a negative pressure suction sheath which comprises a sheath tube, a negative pressure connector and a dilator, 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 dilator 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 present invention relates to the technical field of medical devices, and in particular to a negative pressure suction sheath. Background Art

[0002] Kidney stones have been a problem for humans for a long time. Complications caused by stones in the urinary tract usually require surgical intervention. Traditional surgical procedures for removing stones require surgeons to cut open 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 removal devices shortens the pain and recovery time for patients. Due to the unique anatomical structure of the kidney, it is difficult to reach the renal calyx, especially the lower calyx, during endoscopic renal surgery. Unfortunately, even if the calyx is entered during surgery to remove the stone and effectively fragment it, it is still very difficult to remove the fragments from the calyx. As a result, the patient must expel the fragments on his own, which will prolong the treatment time and experience pain and discomfort.

[0004] Ureteral sheaths are used in urological surgery. Before clinical urological surgery, the ureteral sheath is placed in the ureter to establish a surgical channel. During the operation, an endoscope, laser fiber, stone removal instruments, etc. are introduced through the surgical channel to expel some small stones from the ureteral sheath.

[0005] The existing ureteral sheath generally includes a sheath tube, a negative pressure connector, a dilation tube, etc. The sheath tube is connected to a negative pressure device through a negative pressure connector, and negative pressure is used to suck out the intraoperative gravel and liquid. During the operation, 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 generally set in a place that the operator (i.e., the surgical operator) cannot reach with his hands, such as on the wall of the operating room. Therefore, the operator cannot leave to adjust the suction force in the sheath tube during the operation.

[0006] Therefore, how to adjust the suction force in the sheath according to the pressure in the human body during surgery has become a technical problem that needs to be solved urgently in this field. Summary of the invention

[0007] In order to solve the above technical problems, the present invention provides a negative pressure suction sheath, comprising a sheath tube, a negative pressure joint and a dilator, the negative pressure joint comprising 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, the pressure regulating port is arranged corresponding to the side channel opening or is arranged at an 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.

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

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

[0010] Optionally, the pressure regulating port is provided with an adjusting mechanism capable of adjusting the size of its opening.

[0011] Optionally, the regulating mechanism is a valve or a slider, and the valve or the slider 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 slider.

[0012] Optionally, a sealing gasket and a fixing member are further provided at the proximal end of the main channel cavity, and the sealing gasket is sealed and fixed to the proximal end of the main channel cavity by the fixing member; 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.

[0013] Optionally, 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.

[0014] Optionally, 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, and the degree of squeezing 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.

[0015] Optionally, the fixing member is a threaded fixing member, which fixes the sealing gasket at the proximal end of the main channel cavity by threaded connection with the main channel cavity, and the degree of squeezing the sealing gasket can be adjusted by loosening or tightening the threaded fixing member.

[0016] Optionally, the sheath tube is a single-lumen or multi-lumen structure, and correspondingly, the sealing gasket has one or more inner holes.

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

[0018] Optionally, the tip 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. 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 winding spring or a metal woven wire mesh structure, and the inner layer is a polymer tube with a low friction coefficient.

[0020] Compared with the prior art, the technical solution of the embodiment of the present invention has the following beneficial effects:

[0021] The present invention arranges the pressure regulating port 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 suction force in the sheath. The operator only needs to adjust the size of the pressure regulating port on the handheld negative pressure connector to adjust the negative pressure in the sheath.

[0022] Furthermore, the present invention avoids opening a pressure regulating port on the wall of the sheath, the negative pressure suction channel cavity and the main channel cavity at the distal end of the side channel port, and instead opens a pressure regulating port on the corresponding side channel port of the main channel cavity or on the wall of the end of the side channel port away from the sheath, thereby solving the technical problem of stone accumulation and blockage in the negative pressure suction channel cavity caused by opening a pressure regulating port in the negative pressure suction channel cavity, thereby improving the effect of negative pressure suction. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0024] Figure 1 is a schematic structural diagram of a negative pressure suction sheath provided by an embodiment of the present invention;

[0025] Figure 2 A schematic diagram of the structure of a negative pressure connector provided in one embodiment of the invention (with the pressure regulating port closed);

[0026] Figure 3 A schematic diagram of the structure of a negative pressure connector provided in one embodiment of the invention (with the pressure regulating port opened);

[0027] Figure 4 is a schematic structural diagram of a negative pressure suction sheath provided by another embodiment of the present invention;

[0028] Figure 5 It is a comparison diagram of the pressure regulating port in the present invention being located on the opposite side of the side channel port and located at the vertical side of the side channel port;

[0029] Figure 6 is a schematic diagram of the installation structure of a sealing gasket provided in one embodiment of the present invention;

[0030] Figure 7 This is a comparison diagram of a sealing gasket provided by an embodiment of the present invention in a natural state and in an axially compressed state;

[0031] Figure 8 It is a structural schematic diagram of a negative pressure joint provided by an embodiment of the present invention, which is a W-shaped joint. DETAILED DESCRIPTION

[0032] As described in the background technology, the current ureteral sheath generally includes a sheath tube, a negative pressure connector, a dilation tube, etc. The sheath tube is connected to a negative pressure device through a negative pressure connector, and negative pressure is used to suck out the intraoperative gravel and liquid. During the operation, 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 generally set in a place that the operator (i.e., the surgical operator) cannot reach with his hands, such as on the wall of the operating room. Therefore, the operator cannot leave to adjust the suction force in the sheath tube during the operation.

[0033] To solve the above technical problems, please refer to Figures 1 to 7 The present invention provides a negative pressure suction sheath, comprising a sheath tube 1, a negative pressure joint 2 and a dilator 3, wherein the negative pressure joint 2 comprises a main channel cavity 201 and a negative pressure suction channel cavity 202 located at one side of the main channel cavity 201, the proximal end of the sheath tube 1 is connected to the distal end of the main channel cavity 201, the dilator 3 is inserted from the proximal end of the main channel cavity 201 and extends out of the distal end of the sheath tube 1, and is detachably connected to the main channel cavity 201; a side channel opening 205 is provided on one side of the main channel cavity 201, and the negative pressure suction channel cavity 202 is connected to the side channel opening 205; a pressure regulating port 203 is also provided on the cavity wall of the main channel cavity 201, and the pressure regulating port 203 is arranged corresponding to the side channel opening 205 or is arranged at the end of the side channel opening 205 away from the sheath tube 1, and the negative pressure in the sheath tube 1 can be adjusted by adjusting the opening size of the pressure regulating port 203.

[0034] The present invention sets the pressure regulating port 203 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 size of the suction force in the sheath 1. The operator only needs to adjust the size of the pressure regulating port 203 on the handheld negative pressure connector 2 to adjust the negative pressure in the sheath 1.

[0035] The specific method for adjusting the negative pressure in the sheath tube 1 is as follows: when the minimum negative pressure is required, the pressure regulating port 203 is kept fully open or minimally blocked. When more negative pressure is required, the pressure regulating port 203 is closed to the maximum degree of complete closure.

[0036] The present invention does not impose any specific limitation on the method for adjusting the size 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; or an adjustment mechanism 204 may be provided on the pressure regulating port 203, and the size of the pressure regulating port 203 may be adjusted manually by the adjustment mechanism 204.

[0037] In the technical field, the negative pressure connector 2 is generally a Y-shaped structure, which includes a main channel cavity 201 and a negative pressure suction channel cavity 202 located on the side of the main channel cavity 201. The negative pressure suction channel cavity 202 is connected to the negative pressure device. Therefore, a negative pressure suction air path is formed between the negative pressure suction channel cavity 202 and the sheath tube 1, and the gravel in the human body is sucked out of the human body through the negative pressure suction air path. Since the negative pressure suction channel cavity 202 is located on the negative pressure suction air path and is connected to the negative pressure device, it is easy for a person skilled in the art to think of setting a pressure regulating port on the cavity wall of the negative pressure suction channel cavity 202, and adjusting the size of the negative pressure by adjusting the size of the pressure regulating port. However, this method of opening a pressure regulating 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 regulating port is in a fully open or incompletely open state, the gravel is easily discharged from the pressure regulating port when it is discharged outward through the negative pressure suction channel cavity 202. When the gravel is not smaller than the opening diameter of the pressure regulating port or multiple gravel is crowded and discharged at the pressure regulating port, it is easy to get stuck at the pressure regulating port. Therefore, it is easy to block other gravel from being discharged from the negative pressure suction channel cavity 202. Over time, more and more gravel accumulates in the negative pressure suction channel cavity 202, blocking the negative pressure suction channel cavity 202, and then the gravel in the body can no longer be discharged from the negative pressure suction channel cavity 202.

[0038] In order to solve the above technical problems, the present invention avoids opening a pressure regulating port 203 on the cavity wall of the sheath tube 1, the negative pressure suction channel cavity 202 and the main channel cavity 201 at the distal end of the side channel port 205, and instead opens a pressure regulating port 203 on the corresponding side channel port 205 of the main channel cavity 201 or on the cavity wall at the end of the side channel port 205 away from the sheath tube 1, thereby solving the technical problem of stone accumulation and blockage in the negative pressure suction channel cavity caused by opening a pressure regulating port in the negative pressure suction channel cavity, thereby improving the effect of negative pressure suction.

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] An embodiment of the present invention provides a negative pressure suction sheath, comprising a sheath tube 1, a negative pressure connector 2 and a dilator 3, wherein the negative pressure connector 2 comprises a main channel cavity 201 and a negative pressure suction channel cavity 202 located on one side of the main channel cavity 201, the proximal end of the sheath tube 1 is connected to the distal end of the main channel cavity 201, the dilator 3 is inserted from the proximal end of the main channel cavity 201 and extends out of the distal end of the sheath tube 1, and is detachably connected to the main channel cavity 201; a side channel opening 205 is opened on one side of the main channel cavity 201, and the negative pressure suction channel cavity 202 is connected to the side channel opening 205.

[0041] The present invention does not impose any specific restrictions on the angle between the negative pressure suction channel cavity 202 and the main channel cavity 201. The negative pressure suction channel cavity 202 extends outward from the outer surface of the main channel cavity 201 and forms an angle in the range of greater than 0° to less than 180° with the proximal main channel cavity 201. In one embodiment, the negative pressure suction channel cavity 202 extends outward from the outer surface of the main channel cavity 201 and toward the proximal end of the main channel cavity 201, that is, an acute angle, such as 25° to 45°, is formed between the negative pressure suction channel cavity 202 and the proximal portion of the main channel cavity 201, so as to effectively discharge stones or other foreign matter.

[0042] The present invention does not specifically limit whether the axis of the negative pressure suction channel cavity 202 intersects with the axis of the main channel cavity 201 . As an embodiment, the axis of the negative pressure suction channel cavity 202 intersects with the axis of the main channel cavity 201 .

[0043] As an embodiment, a pressure regulating port 203 is provided on the cavity wall of the main channel cavity 201 , and the pressure regulating port 203 is provided corresponding to the side channel port 205 , that is, the pressure regulating port 203 is located at the opposite side or beside the side channel port 205 .

[0044] Please refer to Figures 1 to 3 , and refer to Figure 5 The left picture of Figure 5 The left side figure shows that the pressure regulating port 203 is located on the opposite side of the side channel port 205. As a specific embodiment, the pressure regulating port 203 is located on the opposite side of the side channel port 205, that is, the cavity wall of the main channel cavity 201 opens 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 are easy to form a "passing wind" gas convection, and the "passing wind" convection enhancement principle can be used to enhance the negative pressure suction effect. At the moment when the pressure regulating port 203 is closed, the negative pressure suction force can be quickly enhanced to efficiently suck out the gravel, thereby improving the suction efficiency. If the negative pressure suction force is small, multiple suctions are required to suck out the gravel, thereby increasing the suction time and increasing the patient's pain.

[0045] Please refer to Figure 4 and Figure 5 The right side of the picture, Figure 5 The right side figure shows that the pressure regulating port 203' is located on the vertical side of the side channel port 205. As a second specific implementation, the pressure regulating port 203' is located on the vertical side of the side channel port 205, that is, the vertical line from the pressure regulating port 203' to the axis of the main channel cavity 201 is perpendicular to the vertical line from the side channel port 205 to the axis of the main channel cavity 201, or the pressure regulating port 203' is located on the vertical 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, and the thumb used to adjust the opening size of the pressure regulating port 203' is closer to the vertical side, which will be more convenient for the operator (operator of the operation) to operate and relieve the operator's fatigue.

[0046] As a third specific implementation, the pressure regulating port 203 is located at the end of the side channel port 205 away from 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, thereby solving the technical problem of stone accumulation and blockage in the negative pressure suction channel cavity 202 caused by opening the pressure regulating port 203 on the negative pressure suction channel cavity 202, thereby improving the effect of negative pressure suction.

[0047] In the prior art, when negative pressure suction is required, the fingers need to be pressed on the pressure regulating port 203 to maintain the sealing state, and long-term operation will cause fatigue to the operator. It will also affect the surgical operation. Taking the operator's dominant hand as the right hand as an example, the existing soft endoscope surgery requires the operator to hold the endoscope with the right hand and fix the soft endoscope sheath with the left hand. Once the left hand finger presses the pressure adjustment interface, the soft endoscope sheath will inevitably fail to be fixed, causing the soft endoscope sheath to move and affecting the operation of holding the endoscope to remove stones. In order to solve this technical problem, the present invention is provided with an adjustment mechanism 204 on the pressure regulating port 203 that can adjust the size of its opening. While the operator's left hand holds the suction sheath, the thumb can be used to move the adjustment mechanism 204 to the desired position, without the need to press the fingers on the pressure regulating port 203.

[0048] In one embodiment, the regulating mechanism 204 is a valve or a slider, and the valve or the slider is movably disposed on the pressure regulating port 203 . The opening size of the pressure regulating port 203 can be adjusted by pushing the valve or the slider.

[0049] Please refer to Figure 6 In one embodiment, the proximal end of the main channel cavity 201 is further provided with a sealing gasket 4 and a fixing member, and the sealing gasket 4 is sealed and fixed to the proximal end of the main channel cavity 201 through the fixing member, so as to achieve the proximal sealing of the main channel cavity 201, thereby ensuring the negative pressure sealing. The sealing gasket 4 is provided with an inner hole, so that the dilator 3 or / and surgical instrument inserted into the main channel cavity 201 is fixedly sleeved on the inner hole of the sealing gasket 4 to achieve a fixed connection with the main channel cavity 201.

[0050] This embodiment does not impose any restriction on the manner of fixing the connection between the fixing member and the proximal end of the main channel cavity 201, which may be a detachable or non-detachable fixing manner such as a snap connection or a threaded connection. To facilitate replacement of the sealing gasket 4, the fixing member is preferably fixedly connected to the main channel cavity 201 in a detachable manner.

[0051] In a natural state, when the inner hole diameter of the sealing gasket 4 is not larger than the outer diameter of the expander 3 and / or the surgical instrument, the expander 3 and / or the surgical instrument can be fixedly connected with the sealing gasket 4 by directly inserting the inner hole of the sealing gasket 4.

[0052] In a natural state, when the inner hole diameter of the sealing gasket 4 is larger than the outer diameter of the expander 3 and / or the surgical instrument, it is necessary to adjust the degree of squeezing the sealing gasket 4 through the fixing member, and then adjust the size of the inner hole of the sealing gasket 4, so that the expander 3 and / or the surgical instrument inserted into the main channel cavity 201 are fixedly sleeved on the inner hole of the sealing gasket 4.

[0053] The above fixed sleeve connection is that the sealing gasket 4 is sleeved on the expander 3 and / or the surgical instrument through the inner hole, and there is no gap between the sealing gasket 4 and the outer periphery of the expander 3 and / or the surgical instrument.

[0054] As an implementation method, the fixing part is a threaded fixing part 5, and the threaded fixing part 5 fixes the sealing gasket 4 at the proximal end of the main channel cavity 201 through a threaded connection with the main channel cavity 201; the sealing gasket 4 is provided with an inner hole, and the degree of squeezing the sealing gasket 4 is adjusted by loosening or tightening the threaded fixing part 5, thereby adjusting the size of the inner hole of the sealing gasket 4, so that the expander 3 and / or surgical instrument inserted into the main channel cavity 201 is fixedly sleeved on the inner hole of the sealing gasket 4 to achieve a fixed connection with the main channel cavity 201.

[0055] In the natural state, the thickness of the sealing gasket 4 is L1. When the inner diameter d1 of the sealing gasket 4 is not less than the outer diameter of the dilator 3 or / and the surgical instrument, the dilator 3 or / and the surgical instrument can smoothly pass through the inner hole of the sealing gasket 4 and enter the sheath 1. By tightening the threaded fixing member 5, the thread of the sealing gasket 4 is axially squeezed. After the sealing gasket 4 is deformed by axial squeezing, the thickness is L2, L1>L2; the inner hole diameter of the sealing gasket 4 is reduced to d2, d2<d1, so the sealing gasket 4 hugs the dilator 3 or / and the surgical instrument through the inner hole, which can control the axial position of the dilator 3 or / and the surgical instrument to prevent it from shifting, and can also form a closed state to ensure negative pressure sealing. Conversely, by loosening the threaded fixing member 5, the axial squeezing state of the sealing gasket 4 is released, and the diameter of the inner hole is restored to the natural state, and the dilator 3 or / and the surgical instrument can be moved.

[0056] In a natural state, when the inner diameter of the sealing gasket 4 is smaller than the outer diameter of the expander 3 and / or the surgical instrument, the expander 3 and / or the surgical instrument and the sealing gasket 4 can be fixedly connected without squeezing the sealing gasket 4.

[0057] 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 1, the proximal end of the dilator 3 is located in the inner hole of the sealing gasket 4, and the dilator 3 is fixedly connected to the negative pressure connector 2 by tightening the threaded fixing 5. After the sheath 1 is inserted into the human body together with the dilator 3 fixed on the negative pressure connector 2, the threaded fixing 5 is loosened, the dilator 3 is pulled out, and the endoscope 6 is inserted into the sheath 1 through the inner hole of the sealing gasket 4, and the threaded fixing 5 is tightened to achieve a fixed connection between the endoscope and the negative pressure connector 2. When the endoscope 6 needs to be moved, the threaded fixing 5 is loosened again, and the endoscope 6 can be moved for diagnosis and treatment. Since the sealing gasket 4 has a variable inner aperture, it can be suitable for dilators 3 and endoscopes 6 of different sizes.

[0058] In this embodiment, when the stones are small, they can enter the space between the endoscope and the sheath 1, and eventually be discharged through the negative pressure suction channel cavity 202. When the stones are large but still small enough to enter the sheath 1, the endoscope can be withdrawn to a position that is just close to the distal end of the negative pressure suction channel cavity 202, allowing the stones to be drawn out of the sheath 1 and the negative pressure suction channel cavity 202 in turn.

[0059] This embodiment does not limit the number of inner holes of the sealing gasket 4, and can be set according to the inner cavity structure of the sheath tube 1. For example, if the sheath tube 1 is a single-cavity structure, the sealing gasket 4 has one inner hole; if the sheath tube 1 is a multi-cavity structure, the sealing gasket 4 has multiple inner holes.

[0060] The present invention does not limit the specific structure of the threaded fixing member 5 that fixes the sealing gasket 4 to the proximal end of the main channel cavity 201. As an embodiment, the threaded fixing member 5 includes a sleeve structure 501, which is coaxially arranged with the main channel cavity 201, and the proximal end of the main channel cavity 201 is provided with an external thread, 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 that matches the external thread, and the sleeve structure 501 is threadedly connected to the external thread of the main channel cavity 201 through its internal thread; the proximal end of the sleeve structure 501 is provided with a cover 502, and the cover 502 is provided with a through hole corresponding to the inner hole of the sealing gasket 4, and the expander 3 and / or the surgical instrument pass through the through hole of the cover 502 and the inner hole of the sealing gasket 4 in turn to the sheath tube 1. The outer diameter of the sealing gasket 4 is larger than the inner diameter of the proximal end of the main channel cavity 201 and larger than the through hole of the cover 502. Therefore, when the sealing gasket 4 is fixed to the proximal end of the main channel cavity 201 by the threaded fastener 5, the proximal end surface of the main channel cavity 201 and the cover 502 on both sides of the sealing gasket 4 will squeeze the sealing gasket 4 at the same time. Therefore, while the sealing gasket 4 holds the expander 3 and / or the surgical instrument, it will also close the through hole of the cover 502, thereby achieving the proximal sealing of the main channel cavity 201 and ensuring the negative pressure sealing.

[0061] In the prior art, the sheath 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 cleared by negative pressure suction, and can only be removed by inserting a stone-removing basket or other instrument into the sheath 1 to grab the stones, which causes pain and economic burden to the patient. In order to solve this technical problem, the sheath 1 of this embodiment can be configured with its head end 101 (i.e., the distal end) as a bendable structure, thereby improving the efficiency of negative pressure stone removal, reducing the use of instruments such as stone-removing baskets, and reducing the economic burden on patients. The head end 5 to 15 cm of the sheath 1 has a different hardness from the rear end, and the head end can bend passively with the bending of the endoscope, reaching the renal pelvis and calyx of the kidney, directly capturing the gravel and sucking it out of the body.

[0062] The tip of the dilator 3 is designed to be soft to reduce implantation damage. The 10-40 cm segment including the tapered portion at the tip of the dilator 3 is set to have a different hardness from the main segment. When encountering narrow or twisted cavities in the human body, the soft tip segment can be smoothly passed over the tortuosity to avoid puncturing the mucosa or puncturing or tearing off the ureter, thereby improving implantation safety.

[0063] The main body of the expander 3 is made of polymer materials such as polyethylene and polypropylene, which have appropriate hardness and take into account the passability and support during insertion. The expander 3 can be designed as a single-cavity or multi-cavity structure, the first cavity is used to pass the guide wire, and the second or other channels are used to infuse liquid or observe the visual instrument and other diagnostic instruments. The expander hand is often made of polymer materials such as polypropylene, which have appropriate hardness and certain deformation resistance, and are easy to load and unload with the negative pressure connector 2.

[0064] The sheath tube 1 is a three-layer composite tube, the outer layer of which is made of thermoplastic materials such as nylon, which has good softness and hardness, and makes the tube body have good support and toughness. The middle layer adopts a wound spring or metal woven wire mesh material structure, so that the tube body has good bending resistance and support, ensuring the stability of the channel. The inner layer often uses a polymer tube with a low friction coefficient such as Teflon, so that the lumen has good surface smoothness or passability, reducing the insertion and removal resistance of the endoscope and surgical treatment instruments, while protecting the instruments.

[0065] The sheath 1 can be designed as a single-lumen or multi-lumen structure, the first lumen is used for passing the dilator 3 and the endoscopic stone removal instrument, and the second lumen is used for passing the safety guide wire or other diagnostic and treatment instruments.

[0066] The present invention is applicable to which specific part of the human body the negative pressure suction sheath is used to suction and discharge intraoperative lithotripsy and / or liquids through negative pressure. Therefore, the present invention does not limit the size of the sheath 1, which can be set according to actual use requirements. For example, the negative pressure suction sheath is used to treat ureteral stones, kidney stones, gallstones, etc. The inner diameter of the sheath 1 is 8 to 16 French, the outer diameter is 10 to 18 French, and the effective length is 10 to 60 cm. When in use, the sheath 1 is inserted into the human body, and the negative pressure connector 2 is located outside the human body.

[0067] Negative pressure connectors are often made of transparent polymer materials such as polycarbonate, which facilitates visual observation of the endoscope stone removal withdrawal distance, negative pressure suction effect and stone excretion. The main channel cavity 201 of the negative pressure connector 2 is designed to be a funnel shape that changes from thin to thick. The connecting end of the sheath 1 is a thin port, and the endoscope entry and exit end is a thick port. The endoscope end is set to be larger than the end of the sheath 1 by more than 2Fr to improve the guideability of endoscopic instruments when entering and exiting. The negative pressure connector 2 can be a Y-shaped connector, that is, a negative pressure suction channel cavity 202 is provided on one side of the main channel cavity 201 to achieve negative pressure suction. Please refer to Figure 8The negative pressure connector 2 can also be a W-shaped connector, that is, in addition to the negative pressure suction channel cavity 202, a side channel 206 or even multiple side channels 206 can be set on the side of the main channel 201 to achieve the perfusion of contrast agent or the insertion of other instruments such as pressure / temperature measuring catheters. The inner diameter of the negative pressure suction channel cavity 202 is not less than the inner diameter of the sheath tube 1 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 connected to a main pipe, the other end of which is connected to a collection container, and one end of an auxiliary pipe is connected to the collection container, the other end of the auxiliary pipe is connected to a negative pressure device, and the negative pressure device is activated to remove tissue debris.

[0069] In summary, the present invention sets the pressure regulating port 203 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 size of the suction force in the sheath 1. The operator only needs to adjust the size of the pressure regulating port 203 on the handheld negative pressure connector 2 to adjust the negative pressure in the sheath 1.

[0070] Furthermore, the present invention avoids opening a pressure regulating port 203 on the cavity wall of the sheath tube 1, the negative pressure suction channel cavity 202 and the main channel cavity 201 at the distal end of the side channel port 205, and instead opens a pressure regulating port 203 on the corresponding side channel port 205 of the main channel cavity 201 or on the cavity wall at the end of the side channel port 205 away from the sheath tube 1, thereby solving the technical problem of stone accumulation and blockage in the negative pressure suction channel cavity 202 caused by opening a pressure regulating port 203 on the negative pressure suction channel cavity 202, thereby improving the effect of negative pressure suction.

[0071] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

Claims

1. A negative pressure suction sheath, It is characterized in that It 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 at 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 provided 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 an 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, It is 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, It is characterized in that The pressure regulating port is located at a vertical side of the side channel port.

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

5. The negative pressure suction sheath according to claim 4, It is 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, It is characterized in that The proximal end of the main channel cavity is also provided with a sealing gasket and a fixing member, and the sealing gasket is sealed and fixed to the proximal end of the main channel cavity by the fixing member; 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, It is 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, It is 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 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, It is 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 threaded connection with the main channel cavity. The degree of squeezing the sealing gasket can be adjusted by loosening or tightening the threaded fixing member.

10. The negative pressure suction sheath according to claim 6, It is 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, It is characterized in that The surgical instrument includes an endoscope.

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

13. The negative pressure suction sheath according to claim 1, It is 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 winding 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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