Resectoscope inner sheath, resectoscope and flushing control method of resectoscope

Abstract

The invention discloses a resectoscope inner sheath, a resectoscope and a washing control method of the resectoscope. The inner sheath comprises a sheath tube body, a sheath tube seat is arranged at the tail end of the sheath tube body, and a liquid outlet tube head communicated with an inner cavity of the sheath tube body is arranged on the side wall of the sheath tube seat; the flow deflecting end is arranged at the front end of the sheathing canal body and provided with a main hole channel coaxially communicated with the sheathing canal body and an auxiliary hole channel communicated with the liquid flow channel, a flow deflecting face is arranged on the inner wall of the end, away from the sheathing canal body, of the auxiliary hole channel and guides fluid in the auxiliary hole channel to deflect, and a plurality of flow deflecting grooves are formed in the outer side wall of the flow deflecting end. The resectoscope is composed of an inner sheath, an outer sheath, a handle assembly, an endoscope and an electric resection ring, a plurality of liquid spraying openings are formed between the flow deflecting end and the outer sheath, fluid in the liquid flow channel is sprayed out through the liquid spraying openings and sprayed in a divergent mode under the action of the flow deflecting groove, and fluid flowing out of the auxiliary hole channel can deflect towards the main hole channel and flushes a lens area of the endoscope. The problem that the operation view is affected by bubbles generated during working and bleeding in an operation is solved.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology, specifically relating to an inner sheath of an electrosurgical resectoscope, an electrosurgical resectoscope, and a method for controlling the irrigation of the electrosurgical resectoscope. Background Technology

[0002] Minimally invasive surgery reduces patient trauma and promotes faster recovery, especially in urology. Transurethral resection of the prostate (TURP), utilizing the body's natural anatomical passage—the urethra—has become the gold standard for treating benign prostatic hyperplasia (BPH), and transurethral resection of bladder tumors is rapidly developing. These surgeries are minimally invasive, result in rapid recovery, and shorten hospital stays, providing significant clinical benefits to patients. The TURP system consists of six parts: the endoscope body, the resection system, the light source system, the image transmission system, the irrigation system, and the control system. The endoscope body includes the scope itself, the optical observation system, and its associated illumination device. The TURP system uses high-frequency current from the resection rings to simultaneously cut tissue and coagulate blood. During the process, liquid impacts the dissected tissue while maintaining a clear intraoperative field of vision, facilitating precise manipulation, reducing surgical time, and ensuring surgical safety.

[0003] However, current transurethral surgeries require flushing with fluids such as saline, glucose, or mannitol to maintain a clear surgical field. The existing fluid channels are the inner wall of the outer sheath and the outer wall of the inner sheath, with the outlet located on the anterior sidewall of the outer sheath and the spray nozzle at the very tip. The current endoscope has a cylindrical oblique cut at the tip. When the flushing fluid flows or sprays from the tip of the endoscope along the outer wall, the low pressure and slow flow rate cause the fluid to drip under gravity from the oblique cut at the tip of the inner sheath, affecting the light source and camera system, thus impacting the clarity of the surgical field. Furthermore, it fails to completely flush away blood from the tip of the endoscope, affecting the surgical field and causing difficulties in hemostasis, thereby prolonging the operation time. All of these factors can easily lead to blind spots in the surgical field, increasing the risk of complications. If the irrigation fluid pressure and flow rate are high, air bubbles will be generated during the operation. These air bubbles can adhere to the endoscope lens, affecting the surgical field of vision and operation. It is necessary to repeatedly remove the operating instruments and endoscope to remove the air bubbles, thereby prolonging the operation time. In addition, the prolonged operation time allows the irrigation fluid to be absorbed through the wound, increasing the intravascular volume and increasing the cardiopulmonary load. In severe cases, dilutional hyponatremia may occur. On the other hand, a high irrigation fluid flow rate and a slow return flow rate can easily cause increased bladder pressure, which may affect the patient's life safety.

[0004] Therefore, how to provide a method for controlling the flushing of the inner sheath of the electrosurgical resectoscope, ... and the electrosurgical resectoscope is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the present invention provides an irrigation control method for an electrosurgical endoscope sheath, an electrosurgical endoscope, and an electrosurgical endoscope, which solves the problems of air bubbles generated during the irrigation control process and intraoperative bleeding affecting the surgical field, excessive wound absorption causing hyponatremia, and bladder distension.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: an inner sheath of an electrosurgical endoscope, which is coaxially nested with an outer sheath and forms a liquid channel between the inner and outer sheaths, comprising: a sheath body, one end of which is a front end and the other end is a tail end; A sheath seat is fixedly connected to the tail end of the sheath body, and the side wall of the sheath seat is provided with a liquid outlet tube head that communicates with the internal cavity of the sheath body. The flow-carrying end is fixedly connected to the front end of the sheath body. The flow-carrying end has a main channel coaxially connected to the sheath body and a secondary channel parallel to the main channel and connected to the liquid flow channel. The inner wall of the end of the secondary channel away from the sheath body is provided with a flow-carrying surface, which can guide the fluid inside the secondary channel to flow towards one side of the main channel. The outer wall of the flow-carrying end is provided with multiple flow-carrying grooves, which are used to realize flow-carrying liquid spraying.

[0007] The beneficial technical effects of this invention are as follows: The inner sheath of this invention differs from the horizontal flow surface at the front end of the traditional inner sheath. This invention changes the cross-sectional shape of the front end of the inner sheath, that is, the water flow is collected through the flow channel at the flow end, which changes the direction and flow state of the spray. The flow surface can accurately rinse the front end of the endoscope lens and the surgical area, keeping the surgical field clear and solving the problems of air bubbles and intraoperative bleeding affecting the surgical field of vision during operation. Preferably, the secondary channel is located on the outer side of the sheath body, and the cross-section of the secondary channel is spindle-shaped.

[0008] The resulting technical effect is that the flushing fluid in the secondary channel is directed towards the lens of the endoscope in the main channel, based on the flow surface. This cleanses the lens and surrounding tissues and blood, providing a clear field of vision and facilitating the doctor's operation.

[0009] Preferably, the cross-section of the flow-lifting surface is an arc shape with a lower center and higher sides, and its curvature is 2.62~2.88; the contour line of the flow-lifting surface corresponding to the fluid direction is a curve with a curvature of 2.88~2.97.

[0010] The resulting technical effect is that the flow-carrying surface can concentrate the fluid to the center to achieve flow-carrying, resulting in good rinsing effect. The flow-carrying curvature of the flow-carrying surface is limited, with the aim of accurately cleaning the lens and surgical field of view.

[0011] Preferably, a plurality of the flow-carrying channels are arranged around the flow-carrying end.

[0012] The resulting technical effect is that multiple flow channels achieve a divergent flow spraying effect, which helps to flush tissue or blood at the distal end of the endoscope and reduce the generation of air bubbles.

[0013] Preferably, the cross-section of the flow-carrying trough is an arc-shaped groove with an arcuate radius of 2.62 to 2.88; the bottom of the flow-carrying trough corresponding to the fluid direction is a curved surface with an arcuate radius of 2.88 to 2.97.

[0014] The resulting technical effect is that the flow channel is an arc-shaped groove, which facilitates the collection of flushing fluid at the front end of the inner sheath towards the center on the concave surface, achieving precise flushing of the working area and increasing the flushing impact force to effectively flush away dissected tissue or blood. The flow channel has a flow curvature corresponding to the fluid direction, which changes the spray direction from parallel to the inner sheath direction to a flow-type spray on the concave surface in the longitudinal direction, which helps to flush tissue or blood at the distal end of the endoscope and reduce the generation of air bubbles.

[0015] This invention also discloses an electrosurgical resection endoscope, comprising the aforementioned inner sheath, outer sheath, handle assembly, endoscope, and electrosurgical resection ring. The outer sheath is fitted over the outer side of the inner sheath, and an outer sheath seat is provided at the tail end of the outer sheath. The side wall of the outer sheath seat is provided with a liquid inlet and a liquid outlet. The liquid outlet communicates with the liquid outlet tube head. A liquid channel is formed between the inner wall of the outer sheath and the outer wall of the sheath body. The lifting end extends out of the outer sheath, and multiple spray nozzles are formed between the lifting end and the outer sheath. The fluid in the liquid channel is sprayed out through the spray nozzles and dispersed under the action of the lifting groove to rinse the tissue or blood in the dissected surgical area. The endoscope and electrosurgical resection ring pass through the inner sheath and extend out of the lifting end. The fluid flowing out through the secondary channel can be lifted towards the main channel and rinse the lens area of ​​the endoscope. The internal cavity of the sheath body provides flow channel conditions for the outflow of rinsing fluid.

[0016] The beneficial technical effects of this invention are: compared with traditional electrosurgical resectoscopes, this invention can accurately flush out tissue and blood in the surgical area, while also cleaning the lens, ensuring a clear surgical field, shortening the operation time and reducing the surgical risk.

[0017] Preferably, the endoscope is equipped with a piezoelectric sensor at its front end near the surgical area, and the piezoelectric sensor is used to detect pressure data of the surgical area environment.

[0018] The resulting technical effect is that the piezoelectric sensor monitors the environmental pressure in the surgical area, and uses this feedback to adjust the irrigation flow rate, thereby reducing the environmental pressure in the surgical area.

[0019] Preferably, a flow rate regulating valve is provided at the inlet of the outer sheath, and the flow rate regulating valve is used to control the flow rate of the fluid entering the surgical area.

[0020] The resulting technical effect is that the inlet flow rate can be adjusted by the flow rate regulating valve, thereby regulating the pressure of the surgical area environment (bladder).

[0021] This invention also discloses a method for controlling irrigation with an electroresection endoscope. Using the aforementioned electroresection endoscope, the endoscope with a flow-lifting tip is first placed in the surgical area. A maximum threshold of 3.96 kPa is preset for the bladder storage period pressure. When the surgical area pressure reaches 3.96 kPa, the inlet flow rate regulating valve is controlled to control the irrigation fluid flow rate and reduce bladder pressure. Simultaneously, fluid simulation software is used to numerically simulate and analyze the distribution of air bubbles in the bladder during bladder irrigation with jets from the inlet at different flow rates. The inlet flow rate range is obtained as 0.005–0.05 m / s, ensuring no air bubbles are generated in the surgical area. This method maintains stable bladder pressure and reduces wound absorption of irrigation fluid, thus preventing dilutional hyponatremia.

[0022] The resulting technical effects are as follows: by changing the cross-sectional shape of the inner sheath, the water flow is collected, the direction and flow pattern of the spray are changed, and the proximal and distal working areas (surgical area) of the endoscope can be precisely rinsed. The preset flow rate range of the inlet solves the problems of air bubbles and intraoperative bleeding affecting the surgical field of vision. At the same time, by monitoring bladder pressure and adjusting the flow rate of the inlet, the bladder pressure is kept stable and dilutional hyponatremia is avoided, thereby shortening the operation time and reducing the surgical risk. Attached Figure Description

[0023] Figure 1 This is a diagram of the inner sheath structure of an electrosurgical resection mirror according to the present invention; Figure 2 This is a schematic diagram of the flow-lifting end structure of the inner sheath of an electrosurgical resection mirror according to the present invention; Figure 3 This is a schematic diagram of the internal state of the flow-picking end of the inner sheath of an electrosurgical resection mirror according to the present invention; Figure 4 This is a schematic diagram of the angle of the tip of the inner sheath of an electrosurgical endoscope according to the present invention; Figure 5 This is a schematic diagram of the longitudinal section of the flow-lifting surface or flow-lifting groove of the inner sheath of an electrosurgical resection mirror according to the present invention; Figure 6 This is a structural diagram of an electrosurgical resection mirror according to the present invention; Figure 7 This is an exploded view of an electrosurgical resection mirror according to the present invention; Figure 8 This is a schematic diagram of the liquid spray nozzle of an electrosurgical resection mirror according to the present invention; Figure 9 The inlet flow rate is 0.005 m / s, which represents the flow pattern of the fluid in the bladder. Figure 10 The inlet flow rate is 0.01 m / s, which represents the flow pattern of the fluid in the bladder. Figure 11 The inlet flow rate is 0.05 m / s, which represents the flow pattern of the fluid in the bladder.

[0024] 1 Outer sheath, 11 Outer sheath seat, 12 Liquid inlet, 13 Liquid outlet, 2 Inner sheath, 21 Sheath body, 22 Sheath seat, 23 Liquid outlet head, 24 Flow-carrying end, 241 Main channel, 242 Secondary channel, 243 Flow-carrying surface, 244 Flow-carrying groove, 3 Handle assembly, 4 Endoscope, 5 Spray nozzle, 6 Piezoelectric sensor, 7 Flow rate regulating valve, 8 Through hole. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] See the appendix of this invention. Figures 1 to 11 According to an embodiment of the present invention, an inner sheath of an electrosurgical endoscope is coaxially nested with an outer sheath 1 and forms a liquid channel between the inner and outer sheaths. It includes: a sheath body 21, one end of which is a front end and the other end is a tail end. Sheath seat 22 is fixedly connected to the tail end of sheath body 21. The side wall of sheath seat 22 is provided with a liquid outlet head 23 that communicates with the internal cavity of sheath body 21. The flow-carrying end 24 is fixedly connected to the front end of the sheath body 21. The flow-carrying end 24 has a main channel 241 coaxially connected to the sheath body 21 and a secondary channel 242 parallel to the main channel 241 and connected to the liquid flow channel. The inner wall of the end of the secondary channel 242 away from the sheath body 21 is provided with a flow-carrying surface 243. The flow-carrying surface 243 can guide the fluid inside the secondary channel to flow towards one side of the main channel 242. The outer wall of the flow-carrying end 24 is provided with a plurality of flow-carrying grooves 244, which are used to guide the liquid in the liquid channel to spray outwards. In other embodiments, the secondary channel 242 is located on the outside of the sheath body 21. The cross-section of the secondary channel 242 is fusiform. Both the secondary channel and the flow channel guide the fluid (rinsing liquid) of the liquid channel.

[0027] In other embodiments, the cross-section of the flow-lifting surface 243 is an arc shape with a lower center and higher sides, and its curvature is 2.62~2.88; the outline of the flow-lifting surface 243 corresponding to the fluid direction is a curve, and the curvature of the surface where the curve is located is 2.88~2.97.

[0028] In some other embodiments, a plurality of flow channels 244 are arranged around the flow end 24.

[0029] In some other specific embodiments, the cross-section of the flow channel 244 is an arc-shaped groove with an arcuate radius of 2.62 to 2.88; the bottom of the flow channel 244 corresponding to the fluid direction is a curved surface with an arcuate radius of 2.88 to 2.97.

[0030] The present invention also discloses an electrosurgical resection endoscope, which includes the aforementioned inner sheath 2, outer sheath 1, handle assembly 3, endoscope 4, and electrosurgical resection ring. The outer sheath 1 is sleeved on the outside of the inner sheath 2. An outer sheath seat 11 is provided at the tail end of the outer sheath 1. The side wall of the outer sheath seat 11 is provided with a liquid inlet 12 and a liquid outlet 13. The liquid outlet 13 is connected to the liquid outlet tube head 23. A liquid channel is formed between the inner wall of the outer sheath 1 and the outer wall of the sheath body 21. A lifting end head 24 extends out of the outer sheath 1, and multiple spray nozzles 5 are formed between the lifting end head 24 and the outer sheath 1. The fluid in the liquid flow channel is sprayed out through the spray nozzles and dispersed under the action of the lifting groove to rinse the tissue or blood in the dissected surgical area. The endoscope 4 and electrosurgical resection ring are inserted through the inner sheath 1 and extend out of the lifting end head 24. The fluid flowing out through the secondary channel 242 can be lifted towards the main channel and rinse the lens area of ​​the endoscope. The internal cavity of the sheath body 21 provides flow channel conditions for the outflow of rinsing fluid.

[0031] In other embodiments, the endoscope 4 is provided with a piezoelectric sensor 6 at its front end near the surgical area. The piezoelectric sensor 6 is used to detect pressure data of the surgical area environment (bladder) and is electrically connected to the endoscope system.

[0032] In some other embodiments, a flow rate regulating valve 7 is provided at the inlet 12 corresponding to the outer sheath seat 11. The flow rate regulating valve 7 is used to control the flow rate of the fluid entering the surgical area.

[0033] This invention also discloses a method for controlling irrigation with an electroresection endoscope. Using the aforementioned electroresection endoscope, the endoscope with a pick-up tip is first placed in the surgical area. The maximum threshold is preset to a bladder storage pressure of 3.96 kPa. When the pressure in the surgical area reaches 3.96 kPa, the flow rate regulating valve at the inlet is controlled to control the flow rate of the irrigation fluid, thereby reducing the bladder pressure. At the same time, fluid simulation software is used to numerically simulate and analyze the distribution of air bubbles in the bladder when the jet from the inlet is used to irrigate the bladder at different flow rates. The inlet flow rate range is obtained as 0.005–0.05 m / s, and no air bubbles are generated in the surgical area. This method maintains stable bladder pressure and reduces the absorption of irrigation fluid by the wound, thus avoiding dilutional hyponatremia.

[0034] It should also be noted that the front end of the outer sheath 1 has several through holes 8 to facilitate circumferential spraying. The outer diameter of the flow-carrying end is slightly smaller than the inner diameter of the outer sheath, and the flow-carrying end achieves upward flow to rinse the endoscope through the secondary channel and the flow-carrying surface. The size of the endoscope 4 is smaller than that of the inner sheath 2. The inner wall of the outer sheath 1 and the outer wall of the inner sheath 2 form a liquid outlet channel, from which liquid is sprayed out from the spray port 5.

[0035] In use, the outer sheath 1 is fitted onto the inner sheath 2 (sheath body 21), the outlet 13 is aligned with the outlet tube 23 of the inner sheath, and then the endoscope 4 and handle assembly 3 are inserted into the inner sheath 2. Assembly is complete. Since one or more spray nozzles 5 are formed between the inner wall of the front end of the outer sheath 1 and the outer wall of the front end of the inner sheath 2 (the flow-carrying end), and one or more flow-carrying grooves 244 are provided on the flow-carrying end, the flushing fluid flowing from the spray nozzles converges laterally towards the center in the flow-carrying grooves 244, thereby achieving precise flushing of the working area and increasing the flushing impact force, effectively flushing away dissected tissue or blood. Furthermore, the spray direction changes from parallel to the inner sheath direction to a longitudinal flow-carrying spray, which helps flush tissue or blood at the distal end of the endoscope and reduces the generation of air bubbles. Due to the secondary channel and the flow surface, the rinsing fluid is sprayed upwards from the lower part of the inner sheath, which can effectively and quickly rinse the tissue or blood near the endoscope and reduce the generation of air bubbles. The flow pattern formed by this endoscope front end structure design can quickly and effectively rinse the tissue or blood near the endoscope and the distal end, thus maintaining a clear surgical field.

[0036] A flow rate regulating valve 7 is installed on the outer wall of the liquid inlet 12 at the rear end of the outer sheath, which controls the range of the inlet flow rate. Using the fluid simulation software Fluent, the distribution of air bubbles within the bladder during jet flushing from the spray nozzle 5 at different flow rates was numerically simulated and analyzed. Figure 7 , Figure 8 , Figure 9 The diagrams show the overall flow patterns at inlet velocities of 0.005 m / s, 0.01 m / s, and 0.05 m / s, respectively. In the water-air two-phase flow, red represents air and blue represents water. The numerical simulation results show that the blue water stream formed after the electrosurgical endoscope of this invention is free of red contamination in front of the endoscope and within a wide field of view. This indicates that in the sheath-end arc-shaped flow-selective electrosurgical endoscope structure of this invention, the flow rate adjustable by the flow rate regulating valve is within the range of 0.005–0.05 m / s. The liquid inlet 12 is controlled by the flow rate regulating valve 7, effectively preventing the formation of air bubbles during surgery.

[0037] In addition, a pressure monitoring device is installed at the tip of the endoscope, specifically through a piezoelectric sensor 6, to monitor the pressure inside the bladder. A preset maximum threshold of 3.96 kPa during the bladder storage period is set. When the monitored pressure reaches 3.96 kPa, the pressure monitoring system sends a signal to control the inlet flow rate regulating valve, thereby controlling the flow rate of the irrigation fluid and reducing bladder pressure. Simultaneously, this reduces the absorption of irrigation fluid by the wound, preventing dilutional hyponatremia and ensuring patient safety.

[0038] The apparatus and methods disclosed in the embodiments are described simply because they correspond to the methods disclosed in the embodiments. For relevant details, please refer to the method section.

[0039] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An electrosurgical resectoscope inner sheath coaxially nested with an outer sheath (1) and forming a liquid channel between the inner and outer sheaths, characterized in that, The utility model relates to a sheath for endoscope, which comprises: a sheath body (21), one end of the sheath body (21) being a front end and the other end being a tail end; a sheath seat (22) fixedly connected to the tail end of the sheath body (21), the side wall of the sheath seat (22) being provided with a liquid outlet pipe head (23) communicating with the internal cavity of the sheath body (21); a deflector end head (24) fixedly connected to the front end of the sheath body (21), the deflector end head (24) being provided with a main hole (241) coaxially communicating with the sheath body (21) and a secondary hole (242) parallel to the main hole (241) and communicating with the liquid flow channel, the secondary hole (242) being provided with a deflector surface (243) on the inner wall of the end portion away from the sheath body (21), the deflector surface (243) being capable of guiding the fluid in the secondary hole to flow towards one side of the main hole (241), and the outer side wall of the deflector end head (24) being provided with a plurality of deflector grooves (244) for realizing the deflector type liquid spraying.

2. The sheath according to claim 1, wherein The secondary hole (242) is correspondingly arranged on the outer side of the sheath body (21), and the cross section of the secondary hole (242) is shuttle-shaped.

3. The sheath according to claim 1, wherein The cross section of the deflector surface (243) is arc-shaped with the middle being low and the two sides being high, and the curvature is 2.62-2.88; the profile line of the deflector surface (243) corresponding to the fluid direction is a curve, and the curvature of the curve is 2.88-2.

97.

4. The sheath according to claim 1, wherein The plurality of deflector grooves (244) are arranged on the circumferential side of the deflector end head (24).

5. The sheath according to claim 1, wherein The cross section of the deflector groove (244) is arc-shaped groove, and the curvature of the arc-shaped groove is 2.62-2.88; the groove bottom of the deflector groove (244) corresponding to the fluid direction is a curved surface, and the curvature of the curved surface is 2.88-2.

97.

6. A resectoscope, characterized by, The utility model relates to a sheath for endoscope, which comprises:

7. The resectoscope according to claim 6, characterized in that, a sheath body (21), one end of the sheath body (21) being a front end and the other end being a tail end; a sheath seat (22) fixedly connected to the tail end of the sheath body (21), the side wall of the sheath seat (22) being provided with a liquid outlet pipe head (23) communicating with the internal cavity of the sheath body (21); a deflector end head (24) fixedly connected to the front end of the sheath body (21), the deflector end head (24) being provided with a main hole (241) coaxially communicating with the sheath body (21) and a secondary hole (242) parallel to the main hole (241) and communicating with the liquid flow channel, the secondary hole (242) being provided with a deflector surface (243) on the inner wall of the end portion away from the sheath body (21), the deflector surface (243) being capable of guiding the fluid in the secondary hole to flow towards one side of the main hole (241), and the outer side wall of the deflector end head (24) being provided with a plurality of deflector grooves (244) for realizing the deflector type liquid spraying. The secondary hole (242) is correspondingly arranged on the outer side of the sheath body (21), and the cross section of the secondary hole (242) is shuttle-shaped. The cross section of the deflector surface (243) is arc-shaped with the middle being low and the two sides being high, and the curvature is 2.62-2.88; the profile line of the deflector surface (243) corresponding to the fluid direction is a curve, and the curvature of the curve is 2.88-2.

97. The plurality of deflector grooves (244) are arranged on the circumferential side of the deflector end head (24). The cross section of the deflector groove (244) is arc-shaped groove, and the curvature of the arc-shaped groove is 2.62-2.88; the groove bottom of the deflector groove (244) corresponding to the fluid direction is a curved surface, and the curvature of the curved surface is 2.88-2.

97. The utility model relates to a sheath for endoscope, which comprises: an inner sheath (2), an outer sheath (1), a handle assembly (3), an endoscope (4) and an electric cutting ring, the outer sheath (1) being sleeved on the outer side of the inner sheath (2), the tail end of the outer sheath (1) being provided with an outer sheath seat (11), the side wall of the outer sheath seat (11) being provided with a liquid inlet (12) and a liquid outlet (13), the liquid outlet (13) communicating with the liquid outlet pipe head (23), a liquid channel being formed between the inner wall of the outer sheath (1) and the outer wall of the sheath body (21), the deflector end head (24) extending out of the outer sheath (1) and a plurality of liquid injection ports (5) being formed between the deflector end head (24) and the outer sheath (1), the fluid of the liquid flow channel being sprayed out of the liquid injection ports and being dispersedly sprayed under the action of the deflector grooves to flush the tissues or blood in the stripping area, the endoscope (4) and the electric cutting ring being sleeved in the inner sheath (2) and extending out of the deflector end head (24), the fluid flowing out of the secondary hole (242) being capable of flowing towards the main hole and flushing the lens area of the endoscope, and the internal cavity of the sheath body (21) providing the flow channel condition for the external discharge of the flushing liquid. The front end of the endoscope (4) close to the operation area is provided with a piezoelectric sensor (6) for detecting the pressure data of the operation area environment.

8. The resectoscope according to claim 7, characterized in that, The outer sheath seat (11) is provided with a flow rate regulating valve (7) corresponding to the liquid inlet (12), which is used to control the flow rate of the fluid entering the operation area.

9. A method for controlling the irrigation of a resectoscope, using a resectoscope according to claim 8, characterized in that, First, the resectoscope with a pick-up end is placed in the operation area, and the preset bladder urine storage pressure is 3.96kP as the maximum threshold. When the pressure of the operation area reaches 3.96kP, the flow rate regulating valve of the liquid inlet is controlled, and then the flow rate of the flushing liquid is controlled, the bladder pressure is reduced, and through the fluid simulation software, the numerical simulation analysis of the bubble distribution in the bladder when the liquid inlet sprays the jet flow to flush the bladder at different flow rates is carried out, the flow rate range of the liquid inlet is 0.005-0.05m / s, no bubbles are generated in the operation area, at the same time, the bladder pressure is kept stable and the absorption of the flushing liquid by the wound is reduced, and the occurrence of dilutional hyponatremia is avoided.

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