Cystoscope with pressure detection function

Abstract

The application discloses a cystoscope with pressure detection function, and relates to the technical field of medical devices, which comprises a sheath tube and a cystoscope body. The sheath tube is divided into a distal end and a proximal end. The tube is provided with a perfusion cavity and a pressure measuring cavity. The pressure measuring cavity is provided with a capsule sleeve. The open end of the capsule sleeve is sealed to the cavity wall, and the closed end extends to the proximal end. The cystoscope body is adapted to the pressure measuring cavity, and is provided with a sensor cavity, a tension sensor and a position adjusting component. The sensor is connected to the end of the position adjusting component. The closed end of the capsule sleeve is connected to the sensor through a first cable. The sensor measures tension data. The position adjusting component adjusts the axial position of the sensor, so that the cable and the capsule sleeve are straightened after the body is inserted. The capsule sleeve is arranged in the pressure measuring cavity, and the internal space of the cavity is divided into an outer side and an inner side. The pressure in the bladder causes the axial deformation of the capsule sleeve. The tension change is converted through the first cable and is detected by the sensor. The transmission belongs to mechanical transmission rather than liquid column type fluid transmission. Even if air bubbles enter the pressure measuring cavity, the bladder pressure can still be effectively transmitted, the capsule sleeve generates corresponding deformation, and the measurement accuracy is improved.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a cystoscope with pressure detection function. Background Technology

[0002] During hydrodistension under cystoscopy, the intravesical pressure must be controlled within the range of 80-100 cmH2O. Too low a pressure will result in poor treatment efficacy, while too high a pressure may lead to serious complications such as bladder perforation, extravasation of irrigation fluid, and TUR syndrome. Therefore, real-time monitoring of intravesical pressure during hydrodistension is essential to ensure operational safety and achieve the desired therapeutic effect.

[0003] Current technology typically uses a double-lumen urethral manometry catheter combined with an external pressure sensor to measure intravesical pressure. Specifically, a double-lumen manometry catheter is inserted transurethral into the bladder (one lumen is used for continuous bladder instillation, and the other lumen is connected to an external pressure sensor). An instillation bag filled with normal saline is suspended vertically 80-100 cm above the upper edge of the pubic symphysis. Gravity allows the instillation fluid to flow naturally into the bladder. Instillation is stopped when the intravesical pressure gradually rises to balance the hydrostatic pressure generated by the height of the instillation fluid. The pressure value is then read by the pressure sensor to complete the measurement (this pressure value represents the instillation pressure of the bladder's maximum capacity under anesthesia). This method is a classic urodynamic manometry method and is recommended as the standard procedure by the International Continence Society (ICS). However, the above-mentioned manometry method still has shortcomings in clinical application, as detailed below: During the process of injecting the irrigation fluid into the patient's bladder, air bubbles are almost unavoidable. Once the air bubbles enter the lumen connected to the pressure sensor, they will significantly absorb pressure fluctuations, causing the measured pressure signal to be distorted and unable to accurately reflect the true pressure inside the bladder. This may directly lead to incorrect pressure judgment and trigger subsequent treatment risks.

[0004] Therefore, in the measurement of intrabladder pressure, how to reduce or even avoid the influence of air bubbles on the measurement results and improve the accuracy of pressure measurement is a technical problem that urgently needs to be solved in the existing technology. Summary of the Invention

[0005] The purpose of this invention is to address the problem that in the existing technology, during the process of injecting irrigation fluid into the patient's bladder, air bubbles are almost unavoidable. Once air bubbles enter the lumen connected to the pressure sensor, they will significantly absorb pressure fluctuations, causing the measured pressure signal to be distorted and unable to accurately reflect the true pressure in the bladder. This may directly lead to incorrect pressure judgment and cause risks to subsequent treatment. The invention provides a cystoscope with pressure detection function.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A cystoscope with pressure detection function includes a sheath and a cystoscope body. The endoscope sheath has a distal end and a proximal end. The distal end of the endoscope sheath is used to extend into the human bladder. The endoscope sheath is provided with an infusion chamber and a pressure measuring chamber that extend in parallel along its length. The infusion chamber is used to deliver infusion fluid into the human bladder. The distal end of the pressure measuring chamber is provided with an opening for the inflow of bladder fluid. A sheath is provided inside the pressure measuring chamber. The sheath has an open end and a closed end. The open end of the sheath is sealed to the inner wall of the pressure measuring chamber, and the closed end of the sheath extends towards the proximal end of the endoscope sheath. The outer diameter of the cystoscope body matches the inner diameter of the pressure measuring chamber. A sensor cavity extending along its length is provided inside the cystoscope body. A tension sensor and an adjustment component are provided inside the sensor cavity. The tension sensor is connected to the end of the adjustment component. The closed end of the sheath is connected to the tension sensor via a first cable. The tension sensor is used to measure the tension data of the first cable. The adjustment component is used to adjust the axial position of the tension sensor in the sensor cavity so that after the cystoscope body is inserted into the pressure measuring chamber, the first cable and the sheath are in a taut state in the pressure measuring chamber.

[0007] Preferably, the opening of the pressure measuring chamber for the inflow of bladder fluid is located on the distal end face of the endoscope sheath, and the extension line of the central axis of the pressure measuring chamber passes through the center of the opening.

[0008] Preferably, the opening end of the bladder is flush with the opening at the distal end of the pressure measuring chamber.

[0009] Preferably, the cystoscope body has a gas channel inside. After the cystoscope body is inserted into the pressure measuring chamber, the air in the pressure measuring chamber is extracted through the gas channel, so that the sheath can fit against the inner wall of the pressure measuring chamber.

[0010] Preferably, the proximal end of the endoscope sheath is provided with a rubber tip, and the rubber tip is provided with a through hole for the insertion of the cystoscope body. In its natural state, the diameter of the rubber tip is smaller than the outer diameter of the cystoscope body. After the cystoscope body is inserted into the through hole, the rubber tip relies on its own elasticity to cover and fit the outer wall of the cystoscope body, so as to close the proximal port of the pressure measuring chamber.

[0011] Preferably, the first cable and the tension sensor are detachably connected.

[0012] Preferably, the cystoscope body is axially movable along the pressure measuring chamber to push the sheath out of the pressure measuring chamber and into the human bladder; the gas channel is also used to fill the sheath with gas, so that the sheath located in the bladder expands to occupy part of the space in the bladder.

[0013] Preferably, the closed end of the sheath is connected to a push rod, and the cystoscope body is provided with a guide cavity extending along its length. The two ends of the guide cavity are open structures. The push rod is inserted into the guide cavity and can slide along the guide cavity. The length of the push rod is greater than the length of the cystoscope body, and the free end of the push rod extends out of the cystoscope body.

[0014] Preferably, the push rod has a hollow interior, and the bladder sleeve has a drainage hole that connects to the hollow interior of the push rod. The free end of the push rod is connected to an external negative pressure source, and the liquid in the bladder can be drawn out of the body through the flow channel inside the push rod.

[0015] Preferably, a second cable is also provided inside the hollow cavity of the push rod, one end of the second cable is connected to the area corresponding to the top wall of the bladder when the bladder sheath is in the inflated state, and the other end extends beyond the free end of the push rod; The sheath has a fixed state, a liquid collection state, and a floating state during the perfusion treatment; When the sheath is fixed, the first cable needs to be tightened to create an inward first indentation in the area of ​​the sheath corresponding to the anterior wall of the bladder. Then, the position of the sheath in the bladder is adjusted so that the first indentation formed by the sheath fits against the anterior wall of the bladder. At this time, the infusion fluid in the first indentation is aspirated by the hollow cavity of the push rod. After the infusion fluid is drained, the first indentation of the sheath adheres to the anterior wall of the bladder under negative pressure. The sheath forms a liquid collection state. While the sheath is held in place by adsorption and fixation to the anterior wall of the bladder, gas is continuously injected into the sheath through the gas channel to further expand it. Because the sheath is adsorbed and fixed to the anterior wall of the bladder, it can ensure that its top is submerged below the surface of the instillation fluid. At this time, tightening the second cable will create a second inward indentation in the area of ​​the sheath corresponding to the top wall of the bladder. This second indentation is used to concentrate the instillation fluid. When the sheath floats, the negative pressure applied to the inner cavity of the push rod stops, the adsorption and fixation between the sheath and the anterior wall of the bladder is released, and the sheath floats up under the action of buoyancy, with its top adhering to the top wall of the bladder. At this time, the instillation fluid concentrated in the second depression infiltrates the tissue of the top wall of the bladder.

[0016] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. A cystoscope with pressure detection function according to the present invention comprises a sleeve disposed within the pressure measuring chamber, the opening end of which is sealed to the inner wall of the pressure measuring chamber, dividing the internal space of the pressure measuring chamber into two parts: the outer side of the sleeve (the area communicating with the fluid in the bladder) and the inner side of the sleeve (the area accommodating the first pull cable). When the pressure of the fluid in the bladder acts on the outer side of the sleeve, the sleeve as a whole deforms axially due to the pressure; this deformation is transmitted as a change in tension through the first pull cable, which is detected by a tension sensor. This "pressure-bladder deformation-cable tension" transmission mechanism is essentially a mechanical transmission, rather than a traditional liquid column-type fluid transmission. The bladder, as a complete elastic deformation body, has its compressive deformation determined by the pressure it withstands, regardless of whether air bubbles enter the outer side of the bladder or the total amount of air bubbles. Therefore, even if air bubbles in the infusion fluid enter the pressure measuring chamber on the outer side of the bladder, the following facts remain unchanged: the intrabladder pressure can still be effectively transmitted to the closed end of the bladder, the bladder will still produce deformation corresponding to that pressure, and the first cable will still convert this deformation into a corresponding change in tension. This effectively solves the problem of air bubbles interfering with pressure measurement and improves the accuracy of pressure measurement. 2. The cystoscope with pressure detection function described in this invention, through the orderly switching between three states of the sheath—fixed state, fluid collection state, and floating state—precisely concentrates and delivers the irrigation fluid, which is originally difficult to contact the bladder dome, to the tissue of the bladder dome. This allows the tissue of the bladder dome to achieve sufficient local high concentration contact with the irrigation fluid, effectively solving the problem of insufficient contact between the bladder dome tissue and the irrigation fluid during bladder irrigation therapy, and significantly improving the irrigation therapy effect on lesions of the bladder dome. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the cystoscope sheath and the cystoscope body during bladder manometry. Figure 2 This is a schematic diagram of the capsule in a fixed state; Figure 3 yes Figure 2 A schematic diagram of the structure of A in the middle; Figure 4 This is a schematic diagram of the capsule in the liquid collection state; Figure 5 This is a schematic diagram of the capsule in its floating state; Figure 6 This is a schematic diagram of the operating handle of the cystoscope body.

[0018] The markings in the diagram are: 1-cystoscope sheath, 2-cystoscope body, 3-irrigation chamber, 4-pressure measuring chamber, 5-capsule sheath, 6-sensor chamber, 7-tension sensor, 8-positioning component, 9-first pull cable, 10-gas channel, 11-push rod, 12-second pull cable, 13-drainage hole, 14-first recess, 15-second recess, 16-guide chamber. Detailed Implementation

[0019] The present invention will now be described in detail with reference to the accompanying drawings.

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0021] Example 1: As Figure 1 and Figure 6 As shown, the cystoscope with pressure detection function of the present invention includes a sheath 1 and a cystoscope body 2. The endoscope sheath 1 has a distal end and a proximal end. The distal end of the endoscope sheath 1 is used to extend into the human bladder. The endoscope sheath 1 is provided with an infusion chamber 3 and a pressure measuring chamber 4 extending in parallel along its length. The infusion chamber 3 is used to deliver infusion fluid into the human bladder. The distal end of the pressure measuring chamber 4 is provided with an opening for the inflow of fluid from the bladder. A sleeve 5 is provided inside the pressure measuring chamber 4. The sleeve 5 has an open end and a closed end. The open end of the sleeve 5 is sealed to the inner wall of the pressure measuring chamber 4, and the closed end of the sleeve 5 extends towards the proximal end of the endoscope sheath 1. The outer diameter of the cystoscope body 2 matches the inner diameter of the pressure measuring chamber 4. A sensor cavity 6 extending along its length is provided inside the cystoscope body 2. A tension sensor 7 and an adjustment component 8 are provided inside the sensor cavity 6. The tension sensor 7 is connected to the end of the adjustment component 8. The closed end of the sheath 5 is connected to the tension sensor 7 through a first pull cable 9. The tension sensor 7 is used to measure the tension data of the first pull cable 9. The adjustment component 8 is used to adjust the axial position of the tension sensor 7 in the sensor cavity 6 so that after the cystoscope body 2 is inserted into the pressure measuring chamber 4, the first pull cable 9 and the sheath 5 are in a taut state in the pressure measuring chamber 4.

[0022] Using a cystoscope with pressure detection function as described in this invention, a sleeve 5 is placed inside the pressure measuring chamber 4, and the open end of the sleeve 5 is sealed to the inner wall of the pressure measuring chamber 4, dividing the internal space of the pressure measuring chamber 4 into two parts: the outer side of the sleeve 5 (the area communicating with the fluid in the bladder) and the inner side of the sleeve 5 (the area accommodating the first pull cable 9). When the pressure of the fluid in the bladder acts on the outer side of the sleeve 5, the sleeve 5 as a whole deforms axially due to the pressure; this deformation is transmitted as a change in tension through the first pull cable 9, which is detected by the tension sensor 7.

[0023] This "pressure-sleeve 5 deformation-cable tension" transmission mechanism is essentially a mechanical transmission, rather than a traditional liquid column-type fluid transmission. The sleeve 5, as a complete elastic deformation form, has its compressive deformation determined by the pressure it bears, regardless of whether air bubbles enter the outside of the sleeve 5 or the total amount of air bubbles. Therefore, even if air bubbles in the infusion fluid enter the pressure measuring chamber 4 outside the sleeve 5, the following fact remains unchanged: the intrabladder pressure can still be effectively transmitted to the closed end of the sleeve 5, the sleeve 5 still produces deformation corresponding to this pressure, and the first cable 9 still converts this deformation into a corresponding change in tension. This effectively solves the problem of air bubble interference in pressure measurement and improves the accuracy of pressure measurement.

[0024] Furthermore, in this embodiment, the sheath 5 divides the pressure measuring chamber 4 into an independent outer cavity and an inner cavity. The liquid in the bladder can only enter the outer cavity and cannot flow into the inner cavity. The first cable 9 and the tension sensor 7 are both located in the inner cavity. In this way, the liquid in the bladder will not directly contact the tension sensor 7, avoiding corrosion or contamination of the tension sensor 7 by the liquid. This can effectively extend the service life of the tension sensor 7 and reduce the detection and maintenance costs.

[0025] Specifically, in this embodiment, during hydrodistension therapy, physiological saline at a temperature of 36–37°C is instilled into the human bladder. The instillation fluid flows naturally into the bladder by gravity. When the pressure inside the bladder gradually increases to balance with the hydrostatic pressure generated by the height of the instillation fluid, the instillation is stopped. At this point, the maximum capacity of the bladder under anesthesia is reached, and the internal pressure of the bladder can be measured simultaneously. The sheath 5 can be made of materials with good elasticity and biocompatibility, such as polyurethane or medical-grade silicone. The open end of the sheath 5 can be sealed to the inner wall of the pressure measuring chamber 4 by means of bonding, hot pressing, injection molding, or other methods. The tension sensor 7 can be a strain gauge type or a piezoelectric tension sensor 7; the adjusting component 8 can be a structure with a threaded rod and a locking nut, a sliding rod with a locking structure, etc., used to adjust the axial position of the tension sensor 7 in the sensor cavity 6.

[0026] The closed end of the cystoscope sheath 5 is connected to the tension sensor 7 via the first pull cable 9. The first pull cable 9 can be made of a material with sufficient tensile strength and flexibility, such as medical nylon thread or composite fiber thread. After the cystoscope body 2 is inserted into the pressure measuring chamber 4, the tension sensor 7 is moved proximally within the sensor chamber 6 by adjusting the positioning component 8, thereby keeping the first pull cable 9 and the cystoscope sheath 5 taut within the pressure measuring chamber 4. During pressure measurement, bladder fluid enters the pressure measuring chamber 4 outside the cystoscope sheath 5, and the fluid pressure acts on the closed end of the cystoscope sheath 5, causing the cystoscope sheath 5 to deform axially, thus changing the tension on the first pull cable 9. The tension sensor 7 detects this change in tension and outputs the signal to an external processing unit, which calculates the pressure value of the bladder fluid based on a pre-established tension-pressure calibration curve.

[0027] As a preferred embodiment, based on the above method, the opening of the pressure measuring chamber 4 for the inflow of bladder fluid is further located on the distal end face of the endoscope sheath 1, and the extension line of the central axis of the pressure measuring chamber 4 passes through the center of the opening. This structural arrangement ensures that the bladder fluid pressure acts directly on the closed end of the sheath 5 along the axial direction of the pressure measuring chamber 4, reducing force loss during pressure transmission, improving the sensitivity and accuracy of pressure measurement, and reducing measurement errors.

[0028] As a preferred embodiment, based on the above method, the opening end of the sleeve 5 is further configured to be flush with the opening at the distal end of the pressure measuring chamber 4. This structural configuration avoids the formation of a step structure between the opening end of the sleeve 5 and the fixed portion of the pressure measuring chamber 4, thus ensuring that the pressure of the fluid in the bladder can be transmitted more directly and fully to the closed end of the sleeve 5, reducing unnecessary resistance loss during pressure transmission, and further improving the accuracy of the measurement results.

[0029] Example 2: As Figure 1 , Figure 2 , Figure 3 and Figure 6 As shown, the cystoscope with pressure detection function of the present invention, based on the above method, further includes a gas channel 10 inside the cystoscope body 2. After the cystoscope body 2 is inserted into the pressure measuring chamber 4, the air in the pressure measuring chamber 4 is drawn out through the gas channel 10, so that the sheath 5 can fit against the inner wall of the pressure measuring chamber 4.

[0030] An air channel 10 is provided inside the cystoscope body 2. Air is drawn from the pressure measuring chamber 4 inside the sheath 5 through the air channel 10, allowing the sheath 5 to fit smoothly against the inner wall of the pressure measuring chamber 4. In this smooth fit, the sheath 5 initially has no wrinkles or slack, and the deformation of the sheath 5 caused by changes in bladder pressure can be fully transmitted to the first cable 9. This avoids the displacement loss due to wrinkles or deformation of the sheath 5 itself, thereby further improving the response sensitivity and measurement accuracy of pressure measurement.

[0031] As a preferred embodiment, based on the above method, a rubber tip is further provided at the proximal end of the cystoscope sheath 1. The rubber tip has a through hole for insertion of the cystoscope body 2. In its natural state, the diameter of the rubber tip is smaller than the outer diameter of the cystoscope body 2. After the cystoscope body 2 is inserted into the through hole, the rubber tip, relying on its own elasticity, covers and adheres to the outer wall of the cystoscope body 2, thereby sealing the proximal port of the pressure measuring chamber 4. This structural design ensures a stable negative pressure environment within the pressure measuring chamber 4, allowing the sheath 5 to more firmly adhere to the inner wall of the pressure measuring chamber 4, further guaranteeing stable and reliable pressure transmission and improving measurement accuracy.

[0032] As a preferred embodiment, based on the above method, the first cable 9 and the tension sensor 7 are further designed to be separable.

[0033] This detachable design allows the cystoscope body 2 to be disassembled, cleaned, disinfected, and repaired independently of the endoscope sheath 1 and the capsule 5, facilitating clinical use and allowing for easy replacement of endoscope sheath 1 and capsule 5 of different specifications to meet various clinical needs. Specifically, in this embodiment, the end of the first cable 9 is configured as a threaded connector, and the tension sensor 7 has a corresponding threaded hole structure.

[0034] Example 3: As Figures 1 to 3 As shown, the cystoscope with pressure detection function of the present invention, based on the above method, further includes a cystoscope body 2 that can move axially along the pressure measuring chamber 4 to push the sheath 5 out of the pressure measuring chamber 4 and into the human bladder; the gas channel 10 is also used to fill the sheath 5 with gas, so that the sheath 5 located in the bladder expands to occupy part of the space in the bladder.

[0035] Specifically, in this embodiment, after completing the bladder pressure measurement operation, the cystoscope body 2 moves axially along the pressure measurement chamber 4 to push the sheath 5 into the human bladder. After the sheath 5 enters the bladder, the gas channel 10 is switched to a positive pressure gas source, and gas (such as medical air or carbon dioxide) is injected into the sheath 5 through the gas channel 10, causing the sheath 5 to expand and occupy part of the space inside the bladder. At this time, injecting the therapeutic agent into the bladder through the infusion chamber 3 can significantly reduce the amount of therapeutic agent used. Furthermore, the expanded sheath 5 can support the bladder wall, keeping the bladder wall fully expanded, which is more conducive to the full contact between the therapeutic agent and the bladder wall tissue, thus improving the treatment effect.

[0036] As a preferred embodiment, based on the above method, the closed end of the sheath 5 is further connected to a push rod 11, and a guide cavity 16 extending along its length is provided inside the cystoscope body 2. The two ends of the guide cavity 16 are open structures. The push rod 11 is inserted into the guide cavity 16 and can slide along the guide cavity 16. The length of the push rod 11 is greater than the length of the cystoscope body 2, and the free end of the push rod 11 extends out of the cystoscope body 2.

[0037] Specifically, in this embodiment, the push rod 11 can be made of materials with high axial stiffness, such as medical rigid plastic or medical stainless steel. The end connecting to the sheath 5 can be designed as a smoothly transitioned arc or conical surface to avoid damage to the sheath 5 when it comes into contact with it. When the sheath 5 needs to be pushed into the bladder, the operator grasps the free end of the push rod 11 and pushes it axially towards the distal end. The push rod 11 slides along the guide cavity 16, pushing the sheath 5 into the bladder through the opening at the distal end of the pressure measuring cavity 4. When the sheath 5 needs to be withdrawn from the pressure measuring cavity 4, the operator pulls the push rod 11 axially towards the proximal end, causing the sheath 5 to retract into the pressure measuring cavity 4.

[0038] In this embodiment, the push rod 11, as an independent component, can be operated independently of the cystoscope body 2, which improves the flexibility of pushing and withdrawing the sheath 5 and can better adapt to different clinical operation needs. On the other hand, the diameter of the push rod 11 is smaller than the outer diameter of the cystoscope body 2. When the push rod 11 pushes the sheath 5 into the human bladder, it can prevent the sheath 5 from being moved as a whole and stacked and stuck in the pressure measuring chamber 4, thus improving the smoothness of operation.

[0039] Example 4: Figures 1 to 6As shown, the cystoscope with pressure detection function of the present invention, based on the above method, further includes a hollow structure inside the push rod 11, and a drainage hole 13 on the sleeve 5 that connects to the hollow structure inside the push rod 11. The free end of the push rod 11 is connected to an external negative pressure source, and the liquid in the bladder can be drawn out of the body through the flow channel inside the push rod 11. A second cable 12 is also inserted through the hollow cavity of the push rod 11. One end of the second cable 12 is connected to the area of ​​the bladder top wall when the sheath 5 is in the inflated state, and the other end extends beyond the free end of the push rod 11. The sheath 5 has a fixed state, a liquid collection state, and a floating state during the perfusion treatment; When the sheath 5 is fixed, the first cable 9 needs to be tightened to create an inward first indentation 14 in the area of ​​the sheath 5 corresponding to the anterior wall of the bladder. Then, the position of the sheath 5 in the bladder is adjusted so that the first indentation 14 formed by the sheath 5 fits against the anterior wall of the bladder. At this time, the instillation fluid in the first indentation 14 is aspirated by the hollow cavity of the push rod 11. When the instillation fluid is drained, the first indentation 14 of the sheath 5 is adsorbed and fixed to the anterior wall of the bladder under negative pressure. The sheath 5 forms a liquid collection state. While the sheath 5 is held in place by adsorption and fixation to the anterior wall of the bladder, gas is continuously injected into the sheath 5 through the gas channel 10 to further expand it. Because the sheath 5 is adsorbed and fixed to the anterior wall of the bladder, its top can be ensured to be submerged below the surface of the instillation fluid. At this time, the second cable 12 is tightened to create an inward second indentation 15 on the area of ​​the sheath 5 corresponding to the top wall of the bladder. This second indentation 15 is used to concentrate the instillation fluid. When the sheath 5 floats, the negative pressure applied to the inner cavity of the push rod 11 stops, the adsorption and fixation between the sheath 5 and the anterior wall of the bladder is released, and the sheath 5 floats up under the action of buoyancy, with its top adhering to the top wall of the bladder. At this time, the irrigation fluid concentrated in the second depression 15 infiltrates the tissue of the top wall of the bladder.

[0040] In clinical bladder irrigation therapy, due to the anatomical location of the bladder in the pelvic cavity and the distribution characteristics of the irrigation fluid under the influence of gravity, the irrigation fluid mainly accumulates at the bottom and posterior wall of the bladder in the supine position (Note: In this protocol, the bladder wall directly opposite the urethral orifice in the supine position is the anterior bladder wall, the bladder wall where the urethral orifice is located is the posterior bladder wall, the bladder dorsal wall is the bladder wall tissue above the extension line of the urethral orifice, and the bladder base wall is the bladder wall tissue below the extension line of the urethral orifice). The bladder dorsal wall, located above the bladder spatial structure, is always in the "scarce zone" of the irrigation fluid, making it difficult for the irrigation fluid to fully contact the tissue of the bladder dorsal wall. At the same time, lesions of diseases such as interstitial cystitis often occur on the bladder dorsal wall, making the bladder dorsal wall precisely the area that most needs drug contact during treatment but is the most difficult to reach. This implementation scheme, through the hollow structure of the push rod 11, the cooperation of the second cable 12, and the orderly switching of the sheath 5 between the fixed state, the fluid collection state, and the floating state, can accurately and centrally deliver the infusion fluid to the tissue of the bladder dorsal wall, effectively solving the aforementioned clinical pain points. The specific operation process is as follows: First, after measuring the pressure inside the bladder, the bladder sleeve 5 is pushed into the bladder by the push rod 11, and gas is injected into the bladder sleeve 5 through the gas channel 10, so that the bladder sleeve 5 initially expands inside the bladder. Subsequently, the sheath 5 is fixed in place: the first cable 9 is tightened. Since the first cable 9 connects to the closed end of the sheath 5, tightening the first cable 9 creates an inward first indentation 14 on the area corresponding to the anterior wall of the bladder on the sheath 5. Then, the position of the sheath 5 in the bladder is adjusted by the cystoscope body 2 and / or by pushing the endoscope sheath 1, so that the first indentation 14 formed by the sheath 5 fits against the anterior wall of the bladder. At this time, the free end of the push rod 11 is connected to an external negative pressure source, and the instillation fluid between the first indentation 14 and the anterior wall of the bladder is aspirated using the hollow cavity of the push rod 11. When the instillation fluid in this area is drained, a closed negative pressure cavity is formed between the first indentation 14 and the anterior wall of the bladder. Under the action of negative pressure, the first indentation 14 adheres to and is fixed to the anterior wall of the bladder, thereby firmly fixing the sheath 5 to the anterior wall of the bladder. This state utilizes the suction effect formed by the first indentation 14 of the sheath 5 to achieve stable positioning and fixation of the sheath 5 in the bladder.

[0041] Next, the sheath 5 is brought into a liquid-collecting state: while the sheath 5 remains adhered and fixed to the anterior wall of the bladder, gas is continuously injected into the sheath 5 through the gas channel 10 to further inflate it. Since the sheath 5 is already adhered and fixed to the anterior wall of the bladder, it will not shift upwards due to its own buoyancy during further expansion, thus ensuring that the top of the sheath 5 is always submerged below the surface of the infusion fluid. At this time, the second cable 12 is tightened. Because the second cable 12 connects to the area on the sheath 5 corresponding to the top wall of the bladder, tightening the second cable 12 creates an inward second depression 15 in the area on the sheath 5 corresponding to the top wall of the bladder. Since the top of the sheath 5 is below the surface of the infusion fluid, the space formed between the second depression 15 and the top wall of the bladder is filled with infusion fluid, thus forming a collection cavity for concentrating the infusion fluid. This state utilizes the pre-existing adhesion to overcome the buoyancy of the expanded sheath 5 in the infusion fluid, creating conditions for forming a collection cavity below the liquid surface.

[0042] Finally, the sheath 5 is brought into a floating state: the negative pressure applied to the inner cavity of the push rod 11 is stopped, and the sealed negative pressure cavity between the first recess 14 and the anterior wall of the bladder disappears, releasing the adsorption and fixation between the sheath 5 and the anterior wall of the bladder. After the adsorption and fixation are released, the sheath 5, due to its larger inflation volume and lower overall density than the instillation fluid, automatically floats upward under the action of buoyancy, and its top adheres to the bladder dorsal wall. At this time, the instillation fluid concentrated in the second recess 15 is pressed against the bladder dorsal wall, thereby infiltrating the tissue of the bladder dorsal wall. This state utilizes the buoyancy of the sheath 5 itself as the driving force, and the automatic positioning and adhesion of the top of the sheath 5 to the bladder dorsal wall can be achieved without an additional mechanical drive mechanism, so that the instillation fluid concentrated in the second recess 15 can fully contact the tissue of the bladder dorsal wall.

[0043] In this embodiment, the hollow internal structure of the push rod 11 cooperates with the drainage hole 13, so that the push rod 11 has the dual function of pushing the sheath 5 and draining the fluid in the bladder, making the structure compact. Furthermore, by orderly switching between the fixed state, the fluid collection state, and the floating state of the sheath 5, the irrigation fluid, which is originally difficult to contact the bladder dome, is accurately concentrated and delivered to the tissue of the bladder dome. This allows the tissue of the bladder dome to achieve sufficient local high concentration contact with the irrigation fluid, effectively solving the problem that the tissue of the bladder dome is difficult to contact with the irrigation fluid in bladder irrigation therapy, and significantly improving the irrigation therapy effect on lesions of the bladder dome.

[0044] It should be noted that in this embodiment, the second cable 12 is inserted through the rod of the push rod 11 and extends through the hollow cavity inside and out of the free end of the push rod 11. When the second cable 12 is tightened, the second cable 12 and the central axis of the push rod 11 form an angle of approximately 90 degrees.

[0045] The openings on the free end of the push rod 11 and the rod body through which the second cable 12 passes are provided with rubber tips to ensure the airtightness of the hollow cavity inside the push rod 11.

[0046] An electric tightening wheel is also provided on the operating handle of the cystoscope body 2. The free end of the second cable 12 is connected to the electric tightening wheel. When it is necessary to tighten the second cable 12, the tightening operation can be completed automatically by rotating the electric tightening wheel. There is no need to manually tighten and adjust repeatedly, making the operation more convenient and faster.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A cystoscope with pressure detection function, characterized in that, Includes the cystoscope sheath and the cystoscope body. The endoscope sheath has a distal end and a proximal end. The distal end of the endoscope sheath is used to extend into the human bladder. The endoscope sheath is provided with an infusion chamber and a pressure measuring chamber that extend in parallel along its length. The infusion chamber is used to deliver infusion fluid into the human bladder. The distal end of the pressure measuring chamber is provided with an opening for the inflow of bladder fluid. A sheath is provided inside the pressure measuring chamber. The sheath has an open end and a closed end. The open end of the sheath is sealed to the inner wall of the pressure measuring chamber, and the closed end of the sheath extends towards the proximal end of the endoscope sheath. The outer diameter of the cystoscope body matches the inner diameter of the pressure measuring chamber. A sensor chamber extending along its length is provided inside the cystoscope body. A tension sensor and an adjustment component are provided inside the sensor chamber. The tension sensor is connected to the end of the adjustment component. The closed end of the sheath is connected to the tension sensor via a first cable. The tension sensor is used to measure the tension data of the first cable. The adjustment component is used to adjust the axial position of the tension sensor in the sensor chamber so that after the cystoscope body is inserted into the pressure measuring chamber, the first cable and the sheath are in a taut state in the pressure measuring chamber. The cystoscope body has an internal gas channel. After the cystoscope body is inserted into the pressure measuring chamber, the air in the pressure measuring chamber is extracted through the gas channel, which allows the sheath to fit against the inner wall of the pressure measuring chamber. The proximal end of the endoscope sheath is provided with a rubber tip, and the rubber tip is provided with a through hole for the insertion of the cystoscope body. The diameter of the rubber tip in its natural state is smaller than the outer diameter of the cystoscope body. After the cystoscope body is inserted into the through hole, the rubber tip relies on its own elasticity to cover and fit the outer wall of the cystoscope body, so as to close the proximal port of the pressure measuring chamber. The first cable and the tension sensor are detachably connected; the cystoscope body can move axially along the pressure measuring chamber to push the sheath out of the pressure measuring chamber and into the human bladder; the gas channel is also used to fill the sheath with gas, so that the sheath located in the bladder expands to occupy part of the space in the bladder.

2. The cystoscope with pressure detection function according to claim 1, characterized in that, The opening of the pressure measuring chamber for the inflow of bladder fluid is located on the distal end face of the endoscope sheath, and the extension line of the central axis of the pressure measuring chamber passes through the center of the opening.

3. The cystoscope with pressure detection function according to claim 2, characterized in that, The opening end of the bladder is flush with the opening at the distal end of the pressure measuring chamber.

4. The cystoscope with pressure detection function according to claim 3, characterized in that, The closed end of the sheath is connected to a push rod. The cystoscope body is provided with a guide cavity extending along its length. The two ends of the guide cavity are open structures. The push rod is inserted into the guide cavity and can slide along the guide cavity. The length of the push rod is greater than the length of the cystoscope body, and the free end of the push rod extends out of the cystoscope body.

5. The cystoscope with pressure detection function according to claim 4, characterized in that, The push rod has a hollow interior, and the bladder sleeve has a drainage hole that connects to the hollow interior of the push rod. The free end of the push rod is connected to an external negative pressure source, and the liquid in the bladder can be drained out of the body through the flow channel inside the push rod.

6. The cystoscope with pressure detection function according to claim 5, characterized in that, A second cable is also inserted through the hollow cavity of the push rod. One end of the second cable is connected to the area of ​​the bladder top wall when the sheath is in the inflated state, and the other end extends beyond the free end of the push rod. The sheath has a fixed state, a liquid collection state, and a floating state during the perfusion treatment; When the sheath is fixed, the first cable needs to be tightened to create an inward first indentation in the area of ​​the sheath corresponding to the anterior wall of the bladder. Then, the position of the sheath in the bladder is adjusted so that the first indentation formed by the sheath fits against the anterior wall of the bladder. At this time, the infusion fluid in the first indentation is aspirated by the hollow cavity of the push rod. After the infusion fluid is drained, the first indentation of the sheath adheres to the anterior wall of the bladder under negative pressure. The sheath forms a liquid collection state. While the sheath is held in place by adsorption and fixation to the anterior wall of the bladder, gas is continuously injected into the sheath through the gas channel to further expand it. Because the sheath is adsorbed and fixed to the anterior wall of the bladder, it can ensure that its top is submerged below the surface of the instillation fluid. At this time, tightening the second cable will create a second inward indentation in the area of ​​the sheath corresponding to the top wall of the bladder. This second indentation is used to concentrate the instillation fluid. When the sheath floats, the negative pressure applied to the inner cavity of the push rod stops, the adsorption and fixation between the sheath and the anterior wall of the bladder is released, and the sheath floats up under the action of buoyancy, with its top adhering to the top wall of the bladder. At this time, the instillation fluid concentrated in the second depression infiltrates the tissue of the top wall of the bladder.

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