A negative pressure suction sheath and methods of use thereof

Abstract

The present application belongs to the technical field of medical devices, and particularly relates to a negative pressure suction sheath and a use method thereof, wherein the device comprises: a sheath tube, an expansion tube; a sheath seat, an internal insertion of the sheath seat is provided with a calculus collection groove, which is used for separating liquid and calculus samples and collecting the calculus samples; a negative pressure protection nozzle is installed at a side end of the sheath seat, and the negative pressure protection nozzle is used for balancing the pressure in the sheath seat; a sheath seat buckle cover and a joint assembly; by improving the head end form of the sheath tube to reduce the head stiffness, eddy current is generated between the inner wall of the pipeline and the electronic mirror when bending, so that the phenomenon of lens sticking during negative pressure suction of the calculus is avoided. By adjusting the buckle cover, two groups of conical cylinders are embedded, the air intake of the negative pressure sheath is adjusted by rotating, the independent adjustment of the patient on the kidney pressure is realized, and the damage of the kidney function and the bleeding of the kidney tissue caused by the negative pressure overload are avoided.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology, and in particular relates to a negative pressure suction sheath and its method of use. Background Technology

[0002] Ureteral sheaths are used in urological surgeries. Clinically, urological surgeries must be performed before the procedure, and a ureteral sheath must be inserted into the ureter to establish a surgical channel. During the operation, endoscopes, laser fibers, stone retrieval instruments, etc., are introduced through the surgical channel to remove blood clots and small stones from the ureteral sheath.

[0003] There are two main types of guiding sheaths: conventional and Y-type. Conventional guiding sheaths typically consist of a sheath tube, a sheath seat, a dilator, and a connector. During use, because the sheath tube is relatively rigid, it cannot bend with the flexible endoscope and only serves as an instrument channel. Because the sheath tube of a conventional sheath is also rigid and cannot bend with the flexible endoscope, its effectiveness in clearing stones in difficult-to-access locations such as the lower renal calyx is limited.

[0004] Technical problems with existing Y-shaped guide sheath devices:

[0005] 1. The head of the Y-shaped sheath is relatively soft and can be bent with the flexible endoscope. During the negative pressure suction process, because there is a gap between the flexible endoscope and the inner wall of the sheath, the gap is uneven when bending. Under the suction of negative pressure, large stones and blood clots may appear to cover the lens. When the negative pressure suctions sand-like stones, the lens may get stuck.

[0006] 2. The negative pressure suction of the Y-shaped sheath can only balance the intrarenal pressure to a certain extent. The negative pressure regulation process can only perform coarse pressure regulation and shutdown functions. There is no negative pressure overload protection, which can easily lead to kidney damage and intrarenal tissue bleeding in patients. Summary of the Invention

[0007] The purpose of this invention is to provide a negative pressure suction sheath and its method of use, to solve the problems mentioned in the background art. The following technical solution is provided:

[0008] A negative pressure suction sheath and its method of use, wherein the device includes:

[0009] The sheath is a straight tube with a hollow center and a hydrophilic coating on the surface. It consists of two parts: a mounting part and a bending part. The mounting part is used for assembly and connection, and the bending part is flexible with a constricted head at its left end.

[0010] The expansion tube has a tapered head and an internal through-hole for inserting a guidewire; its surface is coated with a hydrophilic coating so that it can be inserted into the sheath tube to provide support for the inside of the sheath tube.

[0011] The sheath has a conical shape at its left end, a hollow middle section, and a right end that communicates with the outside. It has an internal flow-guiding slope for solution flow. A stone collection trough, which is flat, is embedded inside the sheath to separate the liquid from the stone sample and collect the stone sample. A negative pressure protection nozzle is installed on the side of the sheath to balance the pressure inside and provide negative pressure protection.

[0012] The sheath seat cover is rotatably assembled on the right end of the sheath seat, and the left end of the sheath seat cover is rotatably provided with an adjustment cover. The sheath seat cover and the adjustment cover are installed together on the right end of the sheath seat for adjusting the negative pressure of the sheath seat.

[0013] The connector assembly is fixedly connected to the right end of the sheath seat cover, and has a through hole inside, which can be assembled with the expansion tube.

[0014] In this technical solution, the sheath is made of composite material and consists of three layers: an innermost lubricating layer, a middle spiral wire layer, and an outermost wrapping layer. The curved head is wavy, which provides more space for the aspirated stones during surgery, preventing the scope from getting stuck. The very end of the curved section is constricted, which controls the size of the stones entering the sheath when the gap changes due to bending during surgery, preventing the scope from getting stuck. The wavy shape of the curved section can also create vortices to flush away blood clots and stones adhering to the lens during surgery, ensuring a clear surgical field. The dilator is mainly used to provide internal support when inserting the suction sheath. The tapered end facilitates insertion into the cavity, and the internal through-hole facilitates insertion along the guide wire. The surface is coated with a hydrophilic coating. If a patient with urethral stricture is encountered during surgery, this component can be withdrawn first to dilate the narrowed urethra, which helps with the insertion of the guide sheath.

[0015] By improving the shape of the tip and reducing the stiffness of the head, the sheath head can bend along with the electron microscope, thereby reaching hard-to-reach locations such as the lower calyx to remove stones. When bending, the maximum gap between the inner wall of the tube and the electron microscope is expanded, which generates eddies when the fluid is injected inside, effectively flushing out blood clots and large stones, thus avoiding the phenomenon of the microscope getting stuck when suctioning stones with negative pressure.

[0016] In any of the above technical solutions, the sheath further includes:

[0017] A square groove is formed at the right end of the sheath seat. Two sets of buckles are provided at the tail of the sheath seat. The sheath seat cover is assembled to the right end of the sheath seat by rotating the buckles. A groove is formed on the inner end wall of the sheath seat along its axial direction, and the stone collection groove is embedded in the groove. A slot is formed on the side wall of the sheath seat, and the negative pressure protection nozzle is sealed and installed in the slot. A limiting protrusion is provided on the inner wall of the sheath seat to limit the installation position of the adjusting cover. A passage is provided at the lower end of the sheath seat, and the outer wall of the passage is threaded to close the negative pressure route and prevent the connecting pipe from detaching.

[0018] In this technical solution, the sheath seat and sheath tube are assembled, and an installation position for the stone collection groove is set inside to facilitate the collection of stone samples from postoperative patients. A passage is opened at the bottom to facilitate connection with equipment for stone removal. The outer wall of the passage is threaded to prevent the connection tube from detaching, and the lower end of the passage is connected to a negative pressure device. When the negative pressure device is not needed, the passage can be closed simply by screwing the cap into the external thread of the passage. The buckle can be assembled with the sheath seat cap by rotation. It has a limiting protrusion inside, which can limit the adjustment cap together with the stone collection groove, effectively preventing the adjustment cap from shaking. The sheath seat has a flow guiding slope inside to facilitate solution flow.

[0019] In any of the above technical solutions, the adjusting cover further includes:

[0020] The disc is installed inside the sheath, and its front end face always abuts against the rear end of the limiting protrusion. The disc has a through hole in the middle, and a conical ring block is provided at the center of the front end face. A negative pressure hole is opened at the conical surface of the conical ring block. A paddle is fixed at the upper end of the disc, and the front end face of the paddle always abuts against the square groove.

[0021] In this technical solution, the adjusting cover is installed inside the sheath seat, and bidirectional limiting is achieved through the limiting protrusion and the sheath seat cover. The inner conical section of the conical ring block can be assembled with the sheath seat cover. In use, the negative pressure is adjusted by rotating the lever.

[0022] In any of the above technical solutions, the sheath seat cover further includes:

[0023] The card slot has two slots, which are fixedly opened on the inner wall of the sheath seat cover. The card slot is designed in a trapezoidal shape. The card slot can be rotated to achieve rotational assembly with the buckle, and the card slot can automatically apply pressure and clamp during the rotation process.

[0024] A conical cylinder is fixedly provided at the front end of the sheath seat cover. An air inlet is fixedly opened on the conical surface of the conical cylinder. The conical cylinder can be rotatably assembled with the conical ring block, and the inner conical surface of the conical cylinder and the outer conical surface of the conical ring block are always in close contact. The straight section at the front end of the conical cylinder is coated with a coating that expands into a film when it comes into contact with water, thereby providing a sealing and lubrication effect to the conical ring block rotatably assembled with its front end. By rotating and turning the lever, the size of the opening at the contact point between the negative pressure hole and the air inlet hole can be adjusted, thereby achieving negative pressure regulation.

[0025] The back of the sheath seat cover is fitted with a ring component for fixing to the connector assembly, and the inside of the sheath seat cover has an opening for negative pressure adjustment.

[0026] In this technical solution, the connector assembly and sheath seat are assembled by rotating a snap fastener at their tail. The assembly interface is trapezoidal, and automatic pressure is applied and clamped during rotation. A circular ring is located on the back of this component for connection and fixation with the connector. The flat section of the tapered front end of the snap fastener is coated with a film that expands upon contact with water, forming a seal and providing lubrication to the internal components. By manually rotating and moving a lever, the contact position between the negative pressure port and the air inlet changes, thereby altering the air intake and achieving autonomous adjustment of the pressure inside the sheath seat.

[0027] In any of the above technical solutions, the negative pressure protection nozzle further includes:

[0028] The mounting ring is fixedly installed on the slot. A protective nozzle is fixedly installed on the mounting ring. The protective nozzle has a conical structure and is made of flexible material. Its protruding part is installed facing the inside of the sheath seat. The conical structure allows the protective nozzle to pass through in one direction. When the negative pressure is too high, the protective nozzle will automatically open to adjust the negative pressure value inside the sheath seat and provide pressure relief protection.

[0029] In this technical solution, the protective nozzle is made of flexible material and is installed at the side opening of the sheath seat. The protruding part of the protective nozzle is installed inward, and the conical structure design allows the protective nozzle to have one-way passage performance. When the internal negative pressure is too high, it will automatically open to release pressure and provide protection.

[0030] In any of the above technical solutions, the stone collection tank further includes:

[0031] The stone collection tank is a flat plate that is inserted into the groove. It has evenly spaced drainage holes that are used to separate the stones from the liquid and collect the stone samples. The bottom of the stone collection tank is equipped with reinforcing ribs to improve its rigidity and prevent deformation.

[0032] In this technical solution, the component is flat and inserted into the sheath seat. The component has multiple through holes to facilitate the separation of stones and fluids and to facilitate the collection of stone samples for postoperative analysis. To prevent local deformation of the component during operation, reinforcing ribs are added to the bottom.

[0033] In any of the above technical solutions, the front end of the connector assembly is a long strip-shaped plane, and connecting blocks are provided at both ends of the plane. The connecting blocks can be installed and fixed with the ring component embedded on the back of the sheath seat cover. Arc-shaped structures are provided on both sides of the connector assembly for pulling with fingers.

[0034] In this technical solution, the connector assembly is assembled with the expansion tube, and the connector assembly has a through hole for the guide wire to pass through. The two sides of the connector have arc-shaped structures to facilitate pulling with fingers during use. Connecting blocks are provided at both ends of the long strip plane to temporarily fix it to the sheath seat cover.

[0035] A method for using a negative pressure suction sheath:

[0036] S1: First, the location and size of the patient's stones are determined through examination. After completing the initial preparations, the surgery is performed.

[0037] S2: After the patient is anesthetized and disinfected, a rigid cystoscope is first used to enter the urethra, and then a guidewire is inserted. Under the view of the rigid cystoscope, the guidewire is inserted into the ureter through the ureteral inlet in the bladder.

[0038] S3: Using a rigid endoscope, guide the guidewire into the ureter, from the lower segment to the middle segment, and then insert the guidewire along the ureter until it enters the renal pelvis;

[0039] S4: After fixing the guidewire, remove the rigid ureteroscope, insert the ureteral guide sheath of the present invention from the tail of the guidewire, place the device of the present invention into the kidney along the guidewire, and then remove the dilator tube and connector assembly to complete the device placement and provide the device placement channel.

[0040] S5: First, inject water to flush and activate the coating at the through hole in the middle of the sheath seat cover and the adjusting cover. Then, insert the electron microscope into the sheath tube through the through hole in the middle of the sheath seat cover and the adjusting cover to enter the kidney for lithotripsy. During lithotripsy, connect the passage to the pressure device to clean up the stone fragments while lithotripsy. Adjust the suction pressure by moving the adjusting cover until the stone is completely removed.

[0041] S6: After the operation, depending on the surgical situation, a ureteral stent is placed and the instrument is removed to complete the operation.

[0042] The beneficial effects of this invention are:

[0043] By improving the shape of the tip and reducing the stiffness of the head, the sheath head can bend along with the electron microscope, thereby reaching hard-to-reach locations such as the lower calyx to remove stones. When bending, the maximum gap between the inner wall of the tube and the electron microscope is expanded, which generates eddies when the fluid is injected inside, effectively flushing out blood clots and large stones, thus avoiding the phenomenon of the microscope getting stuck when suctioning stones with negative pressure.

[0044] Furthermore, by setting an adjustable cover, a structure with two sets of conical cylinders interlocking and slots cut into them is adopted. While the cover is fastened, the air intake of the negative pressure sheath can be adjusted by rotating the overlapping position of the two slots, thus enabling the patient to autonomously regulate the intrarenal pressure; avoiding kidney damage and intrarenal tissue bleeding caused by negative pressure overload. Attached Figure Description

[0045] Figure 1 This is a three-dimensional schematic diagram of the present invention;

[0046] Figure 2This is an exploded schematic diagram of the present invention;

[0047] Figure 3 This is an enlarged schematic diagram of the sheath seat in this invention;

[0048] Figure 4 This is a three-dimensional structural diagram of the sheath seat cover in this invention;

[0049] Figure 5 This is a three-dimensional structural diagram of the adjusting cover in this invention;

[0050] Figure 6 This is a schematic diagram of the assembly of the sheath seat cover and the adjusting cover in this invention;

[0051] Figure 7 This is a three-dimensional structural diagram of the connector assembly in this invention;

[0052] Figure 8 This is a three-dimensional structural diagram of the negative pressure protection nozzle in this invention;

[0053] Figure 9 This is a three-dimensional structural diagram of the stone collection tank in this invention;

[0054] Figure 10 This is a schematic diagram illustrating the principle of internal vortices generated in the curved section.

[0055] The attached figures are labeled as follows:

[0056] 100. Sheath; 101. Mounting part; 102. Bending part;

[0057] 200. Expansion tube;

[0058] 300, Sheath seat; 301, Square groove; 302, Buckle; 303, Groove; 304, Hole; 305, Limiting protrusion; 306, Passage;

[0059] 400. Connector assembly; 401. Connecting block; 402. Arc-shaped structure;

[0060] 500. Negative pressure protection nozzle; 501. Mounting ring; 502. Protection nozzle;

[0061] 600. Stone collection tank; 601. Leakage hole; 602. Reinforcing rib;

[0062] 700. Sheath seat cover; 701. Slot; 702. Conical cylinder; 703. Air inlet;

[0063] 800. Adjusting cover; 801. Disc; 802. Conical ring block; 803. Negative pressure hole; 804. Paddle. Detailed Implementation

[0064] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0065] In the description of this application, it should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. For ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0066] like Figure 1 , 2 As shown in Figures 1 and 10, this embodiment provides a negative pressure suction sheath and its method of use, wherein the device includes:

[0067] The sheath 100 is a straight tube with a hollow center and a hydrophilic coating on its surface. It consists of two parts: a mounting part 101 and a bending part 102. The mounting part 101 is used for assembly and connection, and the bending part 102 is flexible and has a constricted head at its left end.

[0068] The expansion tube 200 has a tapered head and an internal through hole for inserting a guide wire; its surface is coated with a hydrophilic coating so that it can be inserted into the sheath tube 100 to provide support for the interior of the sheath tube 100.

[0069] The sheath 300 has a conical shape at its left end, a hollow middle section, and a right end that communicates with the outside. It has an internal flow-guiding slope for solution flow. A stone collection trough 600, which is flat, is embedded inside the sheath 300 to separate the liquid from the stone sample and collect the stone sample. A negative pressure protection nozzle 500 is installed on the side of the sheath 300 to balance the pressure inside the sheath 300 and provide negative pressure protection.

[0070] The sheath seat cover 700 is rotatably assembled on the right end of the sheath seat 300, and the left end of the sheath seat cover 700 is rotatably provided with an adjustment cover 800. The sheath seat cover 700 and the adjustment cover 800 are installed together on the right end of the sheath seat 300 for adjusting the negative pressure of the sheath seat 300.

[0071] The connector assembly 400 is fixedly connected to the right end of the sheath seat cover 700, and has a through hole inside, which can be assembled with the expansion tube 200.

[0072] In this technical solution, the sheath 100 is made of composite material and consists of three layers: an innermost lubricating layer, a middle spiral wire layer, and an outermost wrapping layer. The head of the curved section 102 is wavy, which provides more space for the aspirated stones during surgery and avoids the endoscope getting stuck. The head of the curved section 102 is constricted, which can control the size of the stones entering when the sheath 100 bends during surgery, thus avoiding the endoscope getting stuck. The wavy shape of the curved section 102 can also create vortices to flush away blood clots and stones adhering to the lens during surgery, ensuring a clear surgical field. The dilator 200 mainly serves as an internal support when the suction sheath is inserted. The tapered end facilitates insertion into the cavity, and the internal through-hole facilitates insertion along the guide wire. The surface is coated with a hydrophilic coating. If a patient with urethral stricture is encountered during surgery, this component can be withdrawn first to dilate the narrowed urethra, which helps with the insertion of the guide sheath.

[0073] Furthermore, by improving the shape of the head end to reduce the head stiffness, the head of the sheath 300 can bend along with the electron microscope, thereby enabling it to reach hard-to-reach locations such as the lower calyx to remove stones. When bending, the maximum gap between the inner wall of the tube and the electron microscope is expanded, which generates vortexes when fluid is injected inside, effectively flushing out blood clots and large stones, thus avoiding the phenomenon of the microscope getting stuck when suctioning stones with negative pressure.

[0074] like Figure 3 As shown, specifically, the sheath 300 includes:

[0075] A square groove 301 is formed at the right end of the sheath seat 300. Two sets of buckles 302 are provided at the tail of the sheath seat 300. The sheath seat cover 700 is rotatably assembled to the right end of the sheath seat 300 through the buckles 302. A groove 303 is formed on the inner end wall of the sheath seat 300 along its axial direction. The stone collection groove 600 is embedded in the groove 303. A slot 304 is formed on the side wall of the sheath seat 300. The negative pressure protection nozzle 500 is sealed and installed in the slot 304. A limiting protrusion 305 is provided on the inner wall of the sheath seat 300. The limiting protrusion 305 is used to limit the installation position of the adjusting cover 800. A passage 306 is provided at the lower end of the sheath seat 300. The outer wall of the passage 306 is threaded to close the negative pressure route and prevent the connecting pipe from detaching.

[0076] In this technical solution, the sheath seat 300 is assembled with the sheath tube 100, and an installation position for the stone collection groove 600 is provided inside, which can facilitate the collection of stone samples from postoperative patients. A passage is opened at the bottom to facilitate connection with equipment for stone removal. The outer wall of the passage 306 is provided with threads to prevent the connection tube from detaching, and the lower end of the passage 306 is connected to a negative pressure device. When the negative pressure device is not needed, the passage can be closed simply by screwing the cap into the external thread of the passage 306. The buckle 302 can be assembled with the sheath seat cap 700 by rotation. It is provided with a limiting protrusion 305 inside, which can limit the adjustment cap 800 together with the stone collection groove 600, effectively preventing the adjustment cap 800 from shaking. The sheath seat 300 is provided with a flow guiding slope inside to realize solution guidance.

[0077] In the embodiments of this application:

[0078] like Figure 5 As shown, specifically, the adjusting cover 800 includes:

[0079] The disc 801 is installed inside the sheath 300, and its front end face always abuts against the rear end of the limiting protrusion 305. The disc 801 has a through hole in the middle, and a conical ring block 802 is provided at the center of the front end face. A negative pressure hole 803 is opened at the conical surface of the conical ring block 802. A paddle 804 is fixedly provided at the upper end of the disc 801, and the front end face of the paddle 804 always abuts against the square groove 301.

[0080] In this technical solution, the adjusting cover 800 is installed inside the sheath seat 300, and bidirectional limiting is achieved by the limiting protrusion 305 and the sheath seat cover 700. The inner tapered section of the tapered ring block 802 can be assembled with the sheath seat cover 700. The connection between the paddle 804 and the disc 801 can swing within a small range in the square groove 301. Thus, during use, the negative pressure can be adjusted by manually moving the paddle 804 to drive the disc 801 to rotate.

[0081] In the embodiments of this application:

[0082] like Figure 4 , 6 As shown, specifically, the sheath seat cover 700 includes:

[0083] Two slots 701 are fixedly formed on the inner wall of the sheath seat cover 700. The slots 701 are designed in a trapezoidal shape. By rotating the slots 701, they can be rotated and assembled with the buckle 302. The slots 701 can automatically apply pressure and clamp during rotation.

[0084] A conical cylinder 702 is fixedly provided at the front end of the sheath seat cover 700. An air inlet 703 is fixedly opened on the conical surface of the conical cylinder 702. The conical cylinder 702 can be rotatably assembled with the conical ring block 802, and the inner conical surface of the conical cylinder 702 and the outer conical surface of the conical ring block 802 are always in close contact. The straight section at the front end of the conical cylinder 702 is coated with a coating that expands into a film when it comes into contact with water, thereby providing a sealing and lubrication effect to the conical ring block 802 rotatably assembled with its front end. By rotating and turning the lever 804, the connection between the lever 804 and the disc 801 swings within a small range in the square groove 301, thereby driving the disc 801 to rotate, thereby changing the size of the opening at the contact point between the adjusting negative pressure hole 803 and the air inlet 703, thus realizing negative pressure adjustment.

[0085] The back of the sheath seat cover 700 is fitted with a ring component for fixing to the connector assembly 400. The interior of the sheath seat cover 700 has an opening for negative pressure adjustment.

[0086] In this technical solution, the connector assembly 400 and the sheath seat 300 are rotatably assembled via a buckle 302 at their tails. The assembly interface is designed in a trapezoidal shape, allowing for automatic pressure clamping during rotation. A circular ring is located on the back of this component for connection and fixation with the connector assembly 400. The flat section of the conical front end of the conical barrel 702 is coated with a coating that expands into a film upon contact with water, providing sealing and lubrication to the internal components. By manually rotating the lever 804, the contact position between the negative pressure hole 803 and the air inlet 703 changes, thereby altering the air intake and achieving autonomous adjustment of the pressure within the sheath seat 300.

[0087] In the embodiments of this application:

[0088] like Figure 8 As shown, specifically, the negative pressure protection nozzle 500 includes:

[0089] The mounting ring 501 is fixedly installed on the slot 304. A protective nozzle 502 is fixedly installed on the mounting ring 501. The protective nozzle 502 has a conical structure and is made of flexible material. Its protruding part is installed facing the inside of the sheath seat 300. The conical structure allows the protective nozzle 502 to have one-way passage performance. When the negative pressure is too large, the protective nozzle 502 will automatically open to adjust the negative pressure value inside the sheath seat 300 and provide pressure relief protection.

[0090] In this technical solution, the protective nozzle 502 is made of flexible material and is installed at the side opening of the sheath seat 300. The protruding part of the protective nozzle 502 is installed inward. The conical structure design enables the protective nozzle 502 to have one-way passage performance. When the internal negative pressure is too large, it will automatically open to release pressure and provide protection.

[0091] In the embodiments of this application:

[0092] like Figure 9 As shown, specifically, the stone collection tank 600 includes:

[0093] The stone collection trough 600 is flat and is inserted into the groove 303. It has evenly distributed leakage holes 601, which are used to separate the stones and liquid and collect the stone samples. The bottom of the stone collection trough 600 is provided with reinforcing ribs 602 to improve the rigidity of the stone collection trough 600 and prevent deformation.

[0094] In this technical solution, the component is flat and inserted into the sheath 300. The component has multiple through holes to facilitate the separation of stones and fluids and to facilitate the collection of stone samples for postoperative analysis. To prevent local deformation of the component during operation, reinforcing ribs are added to the bottom.

[0095] In the embodiments of this application:

[0096] like Figure 7 As shown, specifically, the front end of the connector assembly 400 is a long strip-shaped plane, and connecting blocks 401 are provided at both ends of the plane. The connecting blocks 401 can be installed and fixed with the ring component embedded on the back of the sheath seat cover 700. Arc-shaped structures 402 are provided on both sides of the connector assembly 400 for pulling with fingers.

[0097] In this technical solution, the connector assembly 400 is assembled with the expansion tube 200, and the connector assembly 400 has a through hole for the guide wire to pass through. The connector has an arc-shaped structure 402 on both sides for easy pulling with fingers during use. Connecting blocks 401 are provided at both ends of the long strip plane for temporary fixation with the sheath seat cover 700.

[0098] A method for using a negative pressure suction sheath:

[0099] S1: First, the location and size of the patient's stones are determined through examination. After completing the initial preparations, the surgery is performed.

[0100] S2: After the patient is anesthetized and disinfected, a rigid cystoscope is first used to enter the urethra, and then a guidewire is inserted. Under the view of the rigid cystoscope, the guidewire is inserted into the ureter through the ureteral inlet in the bladder.

[0101] S3: Using a rigid endoscope, guide the guidewire into the ureter, from the lower segment to the middle segment, and then insert the guidewire along the ureter until it enters the renal pelvis;

[0102] S4: After fixing the guidewire, remove the rigid ureteroscope, insert the ureteral guide sheath of the present invention from the tail of the guidewire, place the instrument of the present invention into the kidney along the guidewire, and then pull out the dilator tube 200 and connector assembly 400 to complete the instrument placement and provide the instrument placement channel.

[0103] S5: First, water is injected into the through hole in the middle of the sheath seat cover 700 and the adjusting cover 800 to flush and activate the coating. Then, the electron microscope is inserted into the sheath tube 100 through the through hole in the middle of the sheath seat cover 700 and the adjusting cover 800 to enter the kidney for lithotripsy. During lithotripsy, the passage 306 is connected to a pressure device to clean up the stone fragments while lithotripsy is being performed. The suction pressure is adjusted by moving the adjusting cover 800 until the stone is completely removed.

[0104] S6: After the operation, depending on the surgical situation, a ureteral stent is placed and the instrument is removed to complete the operation.

[0105] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A negative pressure suction sheath, characterized in that, include: The sheath (100) is a straight cylinder with a hollow center and a hydrophilic coating on the surface. It consists of two parts: a mounting part (101) and a bending part (102). The mounting part (101) is used for assembly and connection. The bending part (102) is flexible and has a wavy head with one end constricted. The expansion tube (200) has a tapered head and an internal through hole for inserting a guide wire; its surface is coated with a hydrophilic coating so that it can be inserted into the sheath tube (100). The sheath (300) has a conical shape at its left end, a hollow middle section, and a right end that communicates with the outside. It has an internal flow-guiding slope for solution flow. A stone collection groove (600) is embedded inside the sheath (300). The stone collection groove (600) is flat and used to separate the liquid from the stone sample and collect the stone sample. A negative pressure protection nozzle (500) is installed on the side of the sheath (300). The negative pressure protection nozzle (500) is used to balance the pressure inside the sheath (300) and provide negative pressure protection. A sheath seat cover (700) is rotatably assembled at the right end of the sheath seat (300), and an adjusting cover (800) is rotatably provided at the left end of the sheath seat cover (700). The adjusting cover (800) includes a disc (801), a through hole in the middle of the disc (801), and a conical ring block (802) at the center of the front end face. A negative pressure hole (803) is opened at the conical surface of the conical ring block (802). A conical cylinder (7) is fixedly provided at the front end of the sheath seat cover (700). 02), an air inlet (703) is fixedly opened on the conical surface of the conical cylinder (702). The conical cylinder (702) can be rotatably assembled with the conical ring block (802), and the inner conical surface of the conical cylinder (702) and the outer conical surface of the conical ring block (802) are always tightly fitted. The sheath seat cover (700) and the adjusting cover (800) are installed as a whole on the right end of the sheath seat (300) for adjusting the negative pressure of the sheath seat (300). The connector assembly (400) is fixedly connected to the right end of the sheath seat cover (700), and has a through hole inside, which can be assembled with the expansion tube (200).

2. The negative pressure suction sheath according to claim 1, characterized in that, The sheath (300) includes: A square groove (301) is formed at the right end of the sheath seat (300). Two sets of buckles (302) are provided at the tail of the sheath seat (300). The sheath seat cover (700) is rotatably assembled at the left end of the sheath seat (300) through the buckles (302). A groove (303) is formed on the inner end wall of the sheath seat (300) along its axial direction. The stone collection groove (600) is embedded in the groove (303). The side wall of the sheath seat (300) is... A slot (304) is provided, and the negative pressure protection nozzle (500) is sealed and installed in the slot (304); a limiting protrusion (305) is provided on the inner wall of the sheath seat (300), and the limiting protrusion (305) is used to limit the installation position of the adjusting buckle cover (800). A passage (306) is provided at the lower end of the sheath seat (300), and the outer wall of the passage (306) is provided with threads to close the negative pressure route and prevent the connecting pipeline from detaching.

3. The negative pressure suction sheath according to claim 2, characterized in that, The disc (801) is installed inside the sheath (300), and its front end face always abuts against the rear end of the limiting protrusion (305). A paddle (804) is fixedly provided at the upper end of the disc (801), and the front end face of the paddle (804) always abuts against the square groove (301).

4. The negative pressure suction sheath according to claim 3, characterized in that, The sheath seat cover (700) includes: Two slots (701) are fixedly opened on the inner wall of the sheath seat cover (700). The slots (701) are designed in a trapezoidal shape. The slots (701) can be rotated and assembled with the buckle (302). The slots (701) can automatically apply pressure and clamp during the rotation process. The straight section at the front end of the conical cylinder (702) is coated with a coating that expands into a film when exposed to water, thereby providing a sealing and lubricating effect to the conical ring block (802) that is rotatably assembled with its front end; by rotating and turning the lever (804), the size of the opening at the contact point between the negative pressure hole (803) and the air inlet hole (703) can be adjusted, thereby achieving negative pressure regulation; The back of the sheath seat cover (700) is provided with a ring component for fixing to the connector assembly (400), and the interior of the sheath seat cover (700) is provided with an opening for negative pressure adjustment.

5. A negative pressure suction sheath according to claim 2, characterized in that, The negative pressure protection nozzle (500) includes: The mounting ring (501) is fixedly installed on the slot (304). A protective nozzle (502) is fixedly provided on the mounting ring (501). The protective nozzle (502) has a conical structure and is made of flexible material. Its protruding part is installed facing the inside of the sheath seat (300). The conical structure makes the protective nozzle (502) have one-way passage performance. When the negative pressure is too large, the protective nozzle (502) automatically opens to adjust the negative pressure value inside the sheath seat (300) and provide pressure relief protection.

6. A negative pressure suction sheath according to claim 2, characterized in that, The stone collection trough (600) includes: The stone collection trough (600) is a flat plate inserted into the groove (303), and has evenly distributed leakage holes (601) on it. The leakage holes (601) are used to separate the stones and liquid and collect the stone samples. The bottom of the stone collection trough (600) is provided with reinforcing ribs (602) to improve the rigidity of the stone collection trough (600) and prevent deformation.

7. A negative pressure suction sheath according to claim 4, characterized in that, The front end of the connector assembly (400) is a long strip-shaped plane, and connecting blocks (401) are provided at both ends of the plane. The connecting blocks (401) can be installed and fixed with the ring component embedded on the back of the sheath seat cover (700). Arc-shaped structures (402) are provided on both sides of the connector assembly (400) for pulling with fingers.

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