Anti-reflux and adjustable length intrauterine contents extraction forceps

Abstract

The application discloses a kind of anti-reflux and adjustable length's uterine cavity content extraction forceps, it includes handle assembly, forceps rod assembly and forceps head assembly, forceps rod assembly uses inside and outside nested segmented telescopic structure, is formed by outer fixed rod and inner telescopic rod, outer fixed rod connects handle assembly, inner telescopic rod is slidably inserted in outer fixed rod, outer fixed rod side wall is equipped with length locking positioning mechanism, can realize the stepless locking adjustment of forceps rod length, forceps head assembly includes arc clamping claw, forceps head base and anti-reflux cavity, anti-reflux cavity is built-in one-way anti-reflux valve;Inner telescopic rod outer wall is equipped with annular cervical sealing air bag, handle assembly is built-in push-pull rod and connecting rod, can be linked control clamping claw opening and closing.The application aims at providing a kind of length stepless adjustment, anti-reflux effect is good, function integration degree is high and smooth operation's uterine cavity content extraction forceps.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a uterine cavity contents removal forceps that prevents backflow and has an adjustable length. Background Technology

[0002] In gynecological clinical practice, cases such as retained products of conception after induced abortion, retained placental tissue after childbirth, and abnormal growths in the uterine cavity are very common. Clinically, uterine cavity retrieval instruments are needed to grasp and remove retained tissues, pregnancy products, and other contents, as well as to clean the wound and aspirate waste fluids. Currently, the uterine cavity retrieval forceps routinely used in clinical practice have a simple structure and only possess basic grasping functions. They are insufficient to meet the demands of modern, refined, minimally invasive, and low-infection-risk uterine surgeries, and exhibit several inherent technical limitations in actual clinical use. Specific problems are as follows:

[0003] First, the adaptability of the forceps bar length is poor, making stepless and precise adjustment impossible. There are significant individual differences in vaginal length and uterine cavity depth among different female patients. The physiological dimensions of the uterine cavity differ significantly between adult women, postpartum women, and adolescent women. Most existing retrieval forceps have a fixed length structure, and a few telescopic forceps with adjustable positions can only achieve fixed-position adjustments, unable to make continuous fine adjustments based on the patient's actual physiological parameters. If the instrument is inserted too far, it can easily damage the bottom of the uterine cavity; if it is too short, it cannot reach the lesion, resulting in extremely poor surgical adaptability. Furthermore, when adjusting the length of the forceps bar using conventional telescopic retrieval forceps, the internal push-pull rod is prone to movement interference with the handle structure, leading to length adjustment jamming or failure, affecting the operation.

[0004] Secondly, the lack of a robust anti-reflux structure results in a persistently high risk of retrograde infection. During uterine surgery, a large amount of uterine waste fluid, blood, and tissue debris are generated. Current extraction forceps lack a built-in one-way anti-reflux structure, making it highly susceptible to backflow of waste fluid into the uterine cavity after negative pressure suction stops. Furthermore, the instruments cannot effectively seal the internal cervical os, allowing pathogens from the vagina to easily ascend along the cervical passage and invade the uterine cavity. These two factors significantly increase the probability of postoperative retrograde infections such as endometritis and pelvic inflammatory disease, exacerbating the risk of postoperative complications.

[0005] Third, their functions are limited, failing to achieve integrated irrigation, aspiration, and visualization. Traditional uterine retrieval forceps can only grasp tissue and cannot simultaneously perform intraoperative wound irrigation and negative pressure aspiration of waste fluid. During the procedure, it is necessary to frequently change various instruments such as retrieval forceps, irrigation tubes, and suction devices, prolonging the operation time and increasing the risk of repeated stimulation and damage to the uterine cavity. At the same time, most conventional retrieval forceps lack intraoperative visualization and monitoring structures, forcing doctors to rely on experience and operate blindly throughout the procedure, which can easily lead to accidental damage to normal endometrial tissue and the uterine cavity sidewall, resulting in insufficient surgical precision and safety. Summary of the Invention

[0006] In view of the above-mentioned shortcomings in the existing technology, the purpose of this invention is to provide a uterine cavity contents removal forceps with stepless length adjustment, good anti-backflow effect, high functional integration and smooth operation.

[0007] The technical solution adopted by the present invention to achieve the above objectives is as follows: a uterine cavity contents removal forceps with anti-backflow and adjustable length, comprising a handle assembly, a forceps rod assembly, and a forceps head assembly. The forceps rod assembly is a segmented telescopic structure with inner and outer nesting, including an outer fixed rod and an inner telescopic rod. The outer fixed rod is fixedly connected to the handle assembly. One end of the inner telescopic rod is fixed to the forceps head assembly, and the other end is slidably inserted into the outer fixed rod. A length locking and positioning mechanism is provided on the side wall of the outer fixed rod to achieve stepless locking and adjustment of the overall length of the forceps rod. The forceps head assembly includes two sets of arc-shaped clamps that are hinged to each other. The device comprises a gripper, a clamping head base, and an anti-backflow cavity. Two sets of arc-shaped gripper claws are hinged to the front end of the clamping head base. An anti-backflow cavity is fixedly installed inside the clamping head base on one side of each arc-shaped gripper claw, and a one-way anti-backflow valve is embedded inside the anti-backflow cavity. An annular cervical sealing airbag is arranged around the outer wall of the inner telescopic rod near the clamping head base. The annular cervical sealing airbag is connected to an inflation tube that runs through the clamping rod assembly. The end of the inflation tube extends to the outside of the handle assembly and is equipped with an inflation valve. The handle assembly is linked to the two sets of arc-shaped gripper claws through a built-in push-pull rod and a linkage rod.

[0008] In the above technical solution, the length locking and positioning mechanism includes a threaded sleeve, a sliding guide sleeve, an inclined guide block, a spring plate, and a locking block. One end of the outer fixed rod is threadedly connected to the threaded sleeve, and the other end of the threaded sleeve is rotatably connected to the sliding guide sleeve. The sliding guide sleeve is slidably connected to the outer fixed rod. The inner wall of the sliding guide sleeve has several sliding guide grooves. One end of the sliding guide groove is fixedly connected to a wedge block. The inclined guide surface of the wedge block and the inclined guide surface of the inclined guide block are aligned and fitted. The inclined guide block is slidably assembled inside the sliding guide groove. The outer fixed rod tube wall corresponding to the position of the sliding guide groove has several sliding groove holes. The inner wall of the sliding groove holes is fixedly connected to a spring plate. The outer surface of the spring plate is fixedly connected to the inclined guide block, and the inner surface of the spring plate is fixedly connected to a locking block. The locking blocks are in abutting contact with the outer wall of the inner telescopic rod inside the outer fixed rod.

[0009] In the above technical solution, a U-shaped groove is provided at the end of the pliers head base. The two sets of arc-shaped clamping claws are hinged and installed in the U-shaped groove. The ends of the two sets of arc-shaped clamping claws located in the U-shaped groove are respectively hinged and installed with connecting rods. The other end of each connecting rod is hinged and installed at one end of a push-pull rod. The other end of the push-pull rod passes through the pliers head base and is slidably connected to the inner telescopic rod and the outer fixed rod. After passing through the outer fixed rod, it is connected to the handle assembly.

[0010] In the above technical solution, an anti-backflow cavity is fixedly installed inside the clamp head base on one side of the U-shaped groove. After one end of the anti-backflow cavity passes through the clamp head base, it has several strip-shaped holes. The end of the anti-backflow cavity that passes through the clamp head base is a ball-head structure. After the other end of the anti-backflow cavity passes through the clamp head base, it is fixedly connected to the suction tube. The suction tube is fixedly connected inside the inner telescopic rod and is arranged parallel to the push-pull rod. After the suction tube passes through the inner telescopic rod, it is set inside the outer fixed rod and protrudes from the outer wall of the outer fixed rod.

[0011] In the above technical solution, a flushing pipe is fixedly installed inside the clamp base on one side of the anti-backflow cavity. One end of the flushing pipe is connected to the outer wall of the clamp base, and the other end of the flushing pipe is connected to the water supply pipe. The water supply pipe and the outer wall of the suction pipe are bonded and fixed to each other.

[0012] In the above technical solution, a camera is fixedly installed in the clamp head base on the other side of the U-shaped groove. The lens of the camera is embedded in the end face of the clamp head base. The camera is electrically connected to a data cable, which passes through the inner telescopic rod and the outer fixed rod in sequence.

[0013] In the above technical solution, a spring tube is coiled and connected to the push-pull rod inside the external fixing rod, and the suction tube, water supply tube, data cable and air inflation tube are all slidably inserted inside the spring tube.

[0014] In the above technical solution, the annular cervical sealing airbag is an ultra-thin medical silicone flexible airbag. After inflation, it is shaped like a frustum. The front end of the airbag is attached to the mucosa of the internal cervical os, and the rear end of the airbag is attached to the outer wall of the inner telescopic rod. It is adapted to different sizes of cervical os, seals the annular gap between the cervix and the forceps rod, and prevents the contents of the uterine cavity from overflowing through the cervical gap and causing retrograde infection.

[0015] In the above technical solution, the inner walls of both sets of arc-shaped clamping claws are provided with anti-slip biting teeth, the outer side of the arc-shaped clamping claws is made with full-area rounded blunt treatment and no sharp edges, and the opening and closing angle range of the two sets of arc-shaped clamping claws is 0°-45°.

[0016] In the above technical solution, the handle assembly includes a fixed handle and a movable handle. The fixed handle is rigidly connected to an outer fixed rod. The middle part of the movable handle is hinged to the middle part of the fixed handle. A return spring is fixedly connected between the movable handle and the fixed handle. A sliding sleeve is embedded in one end of the movable handle. A locking sleeve is fixedly connected to one end of the sliding sleeve. After the push-pull rod passes through the outer fixed rod, the sliding sleeve is connected to the sliding sleeve and the locking sleeve. A threaded hole is opened on the outer wall of the locking sleeve. A threaded rod is threadedly connected in the threaded hole. One end of the threaded rod abuts against the push-pull rod. The other end of the threaded rod passes through the threaded hole and is fixedly connected to the hand-tightening operating block.

[0017] The beneficial effects of this invention are:

[0018] This invention features an inner and outer nested telescopic clamp rod combined with a threaded inclined surface length locking mechanism, enabling stepless free adjustment of the clamp rod length to accommodate the varying physiological dimensions of the uterine cavity and vagina in different patients. Simultaneously, the rod length can be precisely fixed as needed, eliminating the need for stepped adjustments and facilitating convenient preoperative adjustments. This completely resolves the problems of poor length adaptability and adjustment bottlenecks associated with traditional instruments, making it suitable for a wider range of patients.

[0019] This invention features a built-in one-way anti-backflow valve paired with a ring-shaped cervical sealing balloon, forming a double-layered anti-backflow barrier structure. The valve prevents the aspirated waste fluid from flowing back into the uterine cavity, while the inflatable balloon seals the cervical passage, blocking ascending vaginal bacterial infection. This simultaneously avoids the risks of fluid backflow and retrograde infection from both ends of the surgical channel, effectively reducing the incidence of postoperative gynecological complications.

[0020] This invention integrates multiple functions including clamping, negative pressure suction, intraoperative irrigation, and front-end visual imaging. The integrated instrument design eliminates the need for repeated instrument changes during the procedure. Fully visualized operation abandons the traditional blind surgical mode, improving surgical precision, reducing intraoperative stimulation and damage to normal uterine tissue, and simplifying the overall surgical process.

[0021] This invention adds an integral spring tube to the outside of the push-pull rod, uniformly housing and protecting all pipelines and data cables, preventing the reciprocating movement of the push-pull rod from squeezing and abrading the internal pipelines. At the same time, it organizes the internal pipeline layout, preventing pipeline tangling and knots, avoiding pipeline leaks and circuit breakage, ensuring stable instrument transmission and telescopic adjustment movements, and extending the instrument's service life.

[0022] This invention optimizes the overall structure of the arc-shaped clamping claws. Anti-slip teeth are incorporated into the inner wall of the clamping claws to enhance clamping stability and prevent soft tissue slippage during surgery. The entire outer wall is blunted without sharp edges. Simultaneously, the opening and closing angle of the clamping claws is limited to prevent excessive opening and closing from damaging the uterine cavity sidewalls, thus balancing clamping reliability with surgical safety.

[0023] This invention optimizes the handle transmission structure, adding a radial locking structure and a pre-unlocking function. The push-pull rod limit can be released before adjusting the clamp length, eliminating motion interference between the push-pull rod and the handle during rod extension and retraction. Simultaneously, it can lock the clamping state, reducing the burden on the surgeon's hands and improving surgical comfort. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure at position A1;

[0026] Figure 3This is a schematic diagram of the cross-sectional connection structure of the length locking and positioning mechanism of the present invention;

[0027] Figure 4 for Figure 3 Detailed structural diagram of part A2 in the middle;

[0028] Figure 5 This is a schematic diagram of the connection structure of the pliers head assembly of the present invention;

[0029] Figure 6 This is a schematic diagram of the cross-sectional connection structure of the clamp head assembly of the present invention;

[0030] Figure 7 This is a schematic diagram of the connection structure of the handle assembly of the present invention;

[0031] Figure 8 for Figure 7 Detailed structural diagram of part A3 in the middle.

[0032] In the diagram: 1. Handle assembly, 10. Push-pull rod, 11. Linkage rod, 2. Clamping rod assembly, 20. External fixing rod, 21. Internal telescopic rod, 22. Length locking and positioning mechanism, 23. Circular cervical sealing airbag, 24. Inflation tubing, 25. Inflation valve, 3. Clamping head assembly, 30. Arc-shaped clamping claw, 31. Clamping head base, 32. Anti-backflow cavity, 33. One-way anti-backflow valve, 101. Threaded sleeve, 102. Sliding guide sleeve, 103. Angled guide block, 104. Spring plate, 1 05 Locking block, 106 Sliding guide groove, 107 Wedge block, 108 Sliding groove hole, 201 U-shaped groove, 202 Strip hole, 203 Suction tube, 204 Flushing tube, 205 Camera, 206 Data cable, 207 Spring tube, 208 Water supply pipe, 301 Fixed handle, 302 Movable handle, 303 Return spring, 304 Sliding sleeve tube, 305 Locking sleeve, 306 Threaded hole, 307 Threaded rod, 308 Hand-tightening operating block. Detailed Implementation

[0033] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0034] Please see Figure 1-8This invention relates to a uterine cavity contents removal forceps that is anti-backflow and adjustable in length. Primarily used in gynecological uterine surgeries, it is used to grasp and aspirate residual tissue, pregnancy tissue, and other uterine cavity contents. It addresses several clinical pain points of traditional uterine cavity removal forceps, including their inability to adapt to different uterine cavity depths, backflow of intraoperative waste fluid and tissue fluid leading to uterine cavity infection, poor cervical sealing during surgery, lack of stepless fine-tuning of the forceps length, poor clamping stability, lack of intraoperative visual monitoring, and inability to simultaneously flush and aspirate. The device consists of three core parts: a handle assembly 1, a forceps bar assembly 2, and a forceps head assembly 3. The entire device is made of medical-grade 304 stainless steel and medical-grade silicone, meeting the sterile requirements of the operating room. Its slender structure is adapted to the physiological passages of the female vagina and cervix. Specific implementation details are as follows:

[0035] Please see Figure 1-4 The clamp rod assembly 2 adopts a segmented telescopic structure with inner and outer nesting, serving as the main support and length adjustment component of the entire instrument. Specifically, it consists of two parts: an outer fixing rod 20 and an inner telescopic rod 21. The rear end of the outer fixing rod 20 is rigidly fixed to the front end of the handle assembly 1 by laser welding to ensure connection strength and prevent the rod from loosening during the operation. The front end of the inner telescopic rod 21 is integrally welded to the rear end of the clamp head base 31. The rear end of the inner telescopic rod 21 is smoothly slidably inserted into the hollow cavity of the outer fixing rod 20. The inner telescopic rod 21 can slide freely along the axial direction of the outer fixing rod 20, thereby realizing the telescopic adjustment of the overall length of the clamp rod.

[0036] Please see Figure 3 and Figure 4 The external fixing rod 20 has an external length locking and positioning mechanism 22 on its side wall. This mechanism can radially clamp and lock the internal telescopic rod 21, achieving stepless locking of the rod length without any gear restriction. The rod insertion length can be freely and finely adjusted according to the uterine cavity depth and vaginal length of different patients, adapting to adult women, minor women, and different physiological uterine cavity sizes after childbirth.

[0037] Please see Figure 5 and Figure 6 The forceps assembly 3, serving as the surgical operating end, consists of two sets of interlocking arc-shaped clamping claws 30, a forceps base 31, and an anti-backflow cavity 32. The two sets of arc-shaped clamping claws 30 serve as the execution components for directly clamping residual tissue in the uterine cavity and are hinged to the front end of the forceps base 31. The anti-backflow cavity 32 is sealed and fixed inside the forceps base 31 and on the side of the arc-shaped clamping claws 30. The anti-backflow cavity 32 is internally fitted with a medical polymer unidirectional anti-backflow valve 33. The valve only allows uterine cavity waste fluid and tissue debris to flow backward in one direction, completely blocking the forward backflow of fluid into the uterine cavity and avoiding retrograde uterine cavity infection.

[0038] Please see Figure 1A ring-shaped cervical sealing airbag 23 is fixed around the outer wall of the inner telescopic rod 21 near the forceps base 31. The airbag is positioned to fit the internal os of the cervix. The airbag is connected to an inflation tube 24 that runs through the entire forceps assembly 2. The inflation tube 24 runs along the outer fixed rod 20 and the inner cavity of the inner telescopic rod 21. The end of the tube extends to the outside of the handle assembly 1. A medical one-way inflation valve 25 is installed at the end of the tube. Medical staff can manually inflate and deflate the airbag through the inflation valve 25 to control its expansion and contraction.

[0039] Please see Figure 6 The handle assembly 1 integrates a push-pull rod 10 and a linkage rod 11. The push-pull rod 10 pushes and pulls axially back and forth, and the linkage rod 11 drives the two sets of arc-shaped clamping claws 30 to open and close simultaneously, thereby clamping and grasping the contents of the uterine cavity and completing the long-distance linkage transmission from the operation at the handle end to the action at the forceps end.

[0040] Please see Figure 3 and Figure 4 The length locking and positioning mechanism 22 is the core component of the stepless length adjustment of this device. It is coaxially sleeved on the outer wall of the outer fixed rod 20 and consists of five main parts: threaded sleeve 101, sliding guide sleeve 102, inclined guide block 103, spring plate 104, and locking block 105. The specific assembly and operation are as follows:

[0041] The outer wall of the outer fixed rod 20 at the sliding sleeve connection of the inner telescopic rod 21 is machined with external threads. The threaded sleeve 101 is screwed onto the outer wall of the outer fixed rod 20 through threaded engagement. One end of the threaded sleeve 101 is connected to the sliding guide sleeve 102 by a sliding sleeve limiting rotation connection. The sliding guide sleeve 102 is loosely fitted on the outer wall of the outer fixed rod 20 and can slide along the axial direction of the outer fixed rod 20. Three to four sets of rectangular sliding guide grooves 106 are evenly opened circumferentially on the inner wall of the sliding guide sleeve 102. The rear end of each set of sliding guide grooves 106 is integrally formed with a wedge block 107. The inclined guide surface of the wedge block 107 is the same as the inclined guide surface of the rear end of the inclined guide block 103. The two are perfectly aligned and fit together, forming an inclined extrusion transmission structure. The inclined guide block 103 is slidably assembled inside the guide groove 106 and can slide linearly back and forth along the guide groove 106. Corresponding to the position of each set of guide grooves 106, the outer fixing rod 20 has a through groove hole 108 on its tube wall. A spring plate 104 is fixed inside the groove hole 108. The outer surface of the spring plate 104 is fixedly connected to the inclined guide block 103. The inner surface of the spring plate 104 is integrally fixed with an arc-shaped locking block 105. The inner arc surface of the arc-shaped locking block 105 is perfectly fitted and matched with the outer wall of the inner telescopic rod 21.

[0042] Locking and unlocking principle: When medical staff rotate the threaded sleeve 101 forward, the threaded sleeve 101 pushes the sliding guide sleeve 102 axially forward. The sliding guide sleeve 102 drives the wedge block 107 to move forward. The inclined surface of the wedge block 107 presses against the inclined guide block 103, forcing the inclined guide block 103 to press the spring plate 104 radially inward along the sliding groove hole 108. The spring plate 104 undergoes elastic deformation, which drives the inner locking block 105 to hug the outer wall of the inner telescopic rod 21. The inner telescopic rod 21 is locked without displacement by relying on static friction. When the threaded sleeve 101 is rotated in the opposite direction, the inclined surface pressing force is released, the spring plate 104 returns to its original position by its own elasticity, and the locking block 105 moves away from the outer wall of the inner telescopic rod 21, thus unlocking the rod. The length of the clamp can then be freely extended and retracted without any gear limit, achieving true stepless length adjustment.

[0043] Please see Figure 5 and Figure 6 A U-shaped groove 201 is formed at the center of the front end of the clamp base 31, which runs through the outer walls of both sides. The opening of the U-shaped groove 201 faces forward. Two sets of arc-shaped clamping claws 30 are symmetrically hinged inside the U-shaped groove 201 to ensure that there is no offset or jamming during the opening and closing of the clamping claws. The two sets of arc-shaped clamping claws 30 are located at the front end inside the U-shaped groove 201 and are each hinged to an independent connecting rod 11. The rear ends of the two connecting rods 11 meet and are hinged to the front end face of the push-pull rod 10.

[0044] The push-pull rod 10 is a solid stainless steel round rod that passes through the clamp head base 31, the hollow inner cavity of the inner telescopic rod 21, and the hollow inner cavity of the outer fixing rod 20 in sequence. It is coaxial with the clamp bar throughout the entire process. The push-pull rod 10 can slide back and forth without obstruction in the inner cavity of the clamp bar. After the rear end of the push-pull rod 10 passes through the outer fixing rod 20, it directly connects with the internal transmission structure of the handle assembly 1. The pressing action of the handle drives the push-pull rod 10 to move axially back and forth, and then drives the two sets of arc-shaped clamping claws 30 to open and close synchronously through the lever transmission of the linkage rod 11.

[0045] Please see Figure 2 An independent sealed chamber is formed inside the forceps base 31 below the U-shaped groove 201. The anti-backflow chamber 32 is sealed and embedded in this chamber to ensure that the uterine fluid will not leak from the assembly gap. The front end of the anti-backflow chamber 32 extends forward out of the end face of the forceps base 31, and the front end is processed into a smooth ball head structure to avoid the sharp end scratching the endometrium of the uterine cavity wall. Multiple sets of long strip-shaped suction holes, i.e. strip holes 202, are formed around the side wall of the ball head to increase the suction contact area and facilitate the entry of uterine waste fluid and fine tissue debris into the cavity.

[0046] The rear end of the anti-backflow cavity 32 extends backward through the forceps base 31 and is sealed and fixed to the front end of the suction tube 203. The suction tube 203 is arranged entirely inside the inner telescopic rod 21, parallel to and without interference with the push-pull rod 10 at the center. The suction tube 203 passes through the inner telescopic rod 21 and the outer fixing rod 20 throughout its length, and finally exits from the rear wall of the outer fixing rod 20, connecting to the negative pressure suction device. In conjunction with the one-way anti-backflow valve 33 inside the cavity, the valve opens to complete suction during negative pressure suction, and automatically closes after the negative pressure disappears, completely preventing the aspirated material from flowing back into the uterine cavity.

[0047] Please see Figure 6 Inside the forceps base 31 on the adjacent side of the anti-backflow cavity 32, an independent flushing tube 204 is installed. The front end of the flushing tube 204 is directly connected to the outer wall of the front end of the forceps base 31, and the flushing fluid can be directly applied to the surgical area of ​​the uterine cavity. The rear end of the flushing tube 204 is connected to a flexible water inlet tube 208. The water inlet tube 208 is arranged inside the forceps along the suction tube 203 and is bonded and fixed to the outer wall of the suction tube 203 throughout the entire process with medical sterile glue, so as to realize the integrated arrangement of the pipeline and avoid the entanglement and misalignment of the pipeline during the operation. During the operation, the flushing fluid storage bag can be connected to the water inlet tube 208 to flush the uterine cavity wound. The waste fluid after flushing is simultaneously suctioned out through the suction tube 203 under negative pressure, forming a closed loop operation of flushing-suction.

[0048] Please see Figure 5 and Figure 6 An installation slot is pre-drilled inside the forceps base 31 above the U-shaped groove 201. A high-definition miniature medical camera 205 is sealed and fixed inside the installation slot. The lens of the camera 205 is flush with the front end face of the forceps base 31, without protrusions or depressions, so as not to interfere with the opening and closing of the clamping claws and the operation of the uterine cavity. The rear end of the camera 205 is connected to an ultra-fine waterproof data cable 206. The data cable 206 runs synchronously with the suction tube 203 and the water inlet tube 208, passing through the inner telescopic rod 21 and the inner cavity of the outer fixation rod 20 in sequence, and finally leading out from the side end of the handle assembly 1 to connect to the intraoperative display screen, realizing real-time visual monitoring of the surgical area inside the uterine cavity, eliminating the need for blind operation by the doctor, and greatly improving the accuracy and safety of the operation.

[0049] Please see Figure 3The outer wall of the push-pull rod 10 inside the external fixation rod 20 is coiled with a spring tube 207. The spring tube 207 has the characteristics of being resistant to bending and compression, and is flexible and bendable. All auxiliary pipes and lines inside the device, including the suction tube 203, water pipe 208, camera 205, data cable 206, and inflation line 24 of the ring cervical sealing airbag 23, are all slidably inserted inside the spring tube 207. On the one hand, this avoids the compression and wear of various pipes and lines when the push-pull rod 10 slides back and forth, preventing pipe damage and leakage, and line breakage. On the other hand, it neatly stores all integrated pipes, avoiding knots in the inner cavity pipes and interference with the transmission of the push-pull rod 10, ensuring the long-term stability of the device. At the same time, the extensibility of the spring tube 207 ensures that the inner telescopic rod 21 slides along the inner cavity of the external fixation rod 20, realizing stepless length adjustment, and in this process, avoiding knots and interference in the inner cavity pipes.

[0050] The circular cervical sealing balloon 23 is made of ultra-thin medical-grade silicone, which has excellent biocompatibility and will not irritate the cervical mucosa. It can directly contact the uterine cavity tissue. In its natural, uninflated state, the balloon is an ultra-thin ring that fits against the outer wall of the inner telescopic rod 21. Its small size does not affect the insertion of instruments into the vagina and uterine cavity. After inflation through the inflation valve 25 at the handle end, the balloon expands into a frustum structure, with the front end of the frustum facing the uterine cavity and the rear end facing the vagina, completely blocking the cervical passage. This achieves a two-way sealing barrier at the cervix, completely isolating the uterine cavity and vaginal passage, blocking ascending vaginal bacterial infection, and further preventing the backflow of uterine contents. After the procedure, opening the inflation valve 25 allows for rapid deflation, causing the balloon to contract and facilitating the smooth withdrawal of instruments from the body cavity.

[0051] In this invention, the arc-shaped clamping claws 30 have an anti-slip structure: the inner clamping surfaces of both sets of arc-shaped clamping claws 30 are integrally formed with fine anti-slip biting teeth. The biting teeth are rounded and blunt, which can improve the clamping friction of the uterine cavity soft tissue and residual pregnancy tissue, prevent tissue slippage during the operation, and at the same time, the sharp teeth are blunted so as not to puncture the fragile uterine cavity soft tissue.

[0052] In terms of safety passivation treatment: the entire outer surface of the arc-shaped clamping claw 30 is fully arc-passivated and polished, without any sharp edges or burrs, to prevent instruments from entering or leaving the uterine cavity and from scratching the vaginal wall, cervix and endometrium during clamping.

[0053] Regarding the opening angle parameters: the maximum opening angle of the two sets of arc-shaped clamping claws is set to 0°-45°, with a closed state of 0°, ensuring complete fit without gaps; the maximum opening angle is 45°, which is suitable for the size of common residual tissue in the uterine cavity in clinical practice. The angle has been clinically calculated to meet the clamping needs of most tissues without compressing or damaging the uterine cavity sidewall due to excessive opening angle.

[0054] Please see Figure 7The handle assembly 1 is the operating end for the doctor's hand, and is divided into two parts: a fixed handle 301 and a movable handle 302. The top of the fixed handle 301 is rigidly welded to the rear end of the outer fixing rod 20 to keep it stationary throughout the entire process. The middle part of the movable handle 302 is hinged to the middle part of the fixed handle 301 by a pin to form a scissor-type handle structure. A return spring 303 is fixedly installed between the inner sidewalls of the fixed handle 301 and the movable handle 302. After the hand pressure is released, the return spring 303 can automatically push open the movable handle 302, which will drive the arc-shaped clamping claw 30 to automatically open and return to its original position.

[0055] Please see Figure 8 An integral sliding sleeve 304 is embedded in the upper end of the movable handle 302. A locking sleeve 305 is fixed at the rear end of the sliding sleeve 304. The rear end of the push-pull rod 10 slides through the sliding sleeve 304 and the locking sleeve 305 and can slide freely axially. A radial through threaded hole 306 is opened on the outer wall of the locking sleeve 305. A threaded rod 307 is threaded inside the threaded hole 306. The inner end of the threaded rod 307 has a flat abutment structure and can abut tightly against the outer wall of the push-pull rod 10. The outer side of the threaded rod 307 protrudes from the threaded hole 306 and is fixed with a circular hand-tightening operating block 308.

[0056] In specific operation, when adjusting the overall length of the forceps bar before surgery, firstly, the hand-tightening operating block 308 needs to be rotated to disengage the end of the threaded rod 307 from the push-pull rod 10, restoring the free sliding of the push-pull rod 10 within the sliding sleeve 304 and locking sleeve 305. Then, the locking state of the inner telescopic rod 21 is released by the length locking and positioning mechanism 22, allowing for stepless adjustment of the extension length of the inner telescopic rod 21. Simultaneously, the inner telescopic rod 21 drives the push-pull rod 10 to slide within the sliding sleeve 304 and locking sleeve 305, thereby preventing the push-pull rod 10 from moving relative to the entire forceps bar during adjustment, thus preventing the handle assembly 1 from being moved. The push-pull rod 10 is limited, thus affecting the adjustment process of the inner telescopic rod 21. After the inner telescopic rod 21 is adjusted, it is first locked and fixed by the length locking and positioning mechanism 22. Then, the push-pull rod 10 is pulled outward to keep the arc-shaped clamping claw 30 in a closed state. At the same time, the movable handle 302 is pressed so that it is slightly close to the fixed handle 301. Then, the hand-tightening operation block 308 is rotated so that the end of the threaded rod 307 abuts against the outer wall of the push-pull rod 10 again. This ensures that during the operation, the push-pull rod 10 can be driven by the movable handle 302 to open and close the arc-shaped clamping claw 30.

[0057] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0058] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A backflow-preventing and adjustable-length forceps for removing uterine contents, comprising a handle assembly (1), a forceps bar assembly (2), and a forceps head assembly (3), characterized in that: The clamp rod assembly (2) is a segmented telescopic structure with inner and outer nesting, including an outer fixed rod (20) and an inner telescopic rod (21). The outer fixed rod (20) is fixedly connected to the handle assembly (1). One end of the inner telescopic rod (21) is fixed to the clamp head assembly (3), and the other end is slidably inserted into the outer fixed rod (20). The side wall of the outer fixed rod (20) is provided with a length locking and positioning mechanism (22) to realize stepless locking adjustment of the overall length of the clamp rod. The inner telescopic rod (21) is surrounded by an annular cervical sealing airbag (23) near the forceps base (31). The annular cervical sealing airbag (23) is connected to an inflation tube (24) that passes through the forceps assembly (2). The end of the inflation tube (24) extends to the outside of the handle assembly (1) and is provided with an inflation valve (25). The clamping head assembly (3) includes two sets of arc-shaped clamping claws (30) hinged to each other, a clamping head base (31) and an anti-backflow cavity (32). The two sets of arc-shaped clamping claws (30) are hinged to the front end of the clamping head base (31). An anti-backflow cavity (32) is fixedly installed inside the clamping head base (31) on one side of the arc-shaped clamping claws (30). A one-way anti-backflow valve (33) is embedded inside the anti-backflow cavity (32). The handle assembly (1) is linked with two sets of arc-shaped clamping claws (30) through the built-in push-pull rod (10) and the linkage rod (11).

2. The anti-backflow and adjustable-length forceps for removing uterine contents according to claim 1, characterized in that: The length locking and positioning mechanism (22) includes a threaded sleeve (101), a sliding guide sleeve (102), an inclined guide block (103), a spring plate (104), and a locking block (105). One end of the outer fixing rod (20) is threadedly connected to the threaded sleeve (101), and the other end of the threaded sleeve (101) is rotatably connected to the sliding guide sleeve (102). The sliding guide sleeve (102) is slidably connected to the outer fixing rod (20). The inner wall of the sliding guide sleeve (102) is provided with several sliding guide grooves (106). One end of the sliding guide groove (106) is fixedly connected to a wedge block (107). The inclined guide surface of the wedge block (107) is inclined with the inclined guide surface. The inclined guide surface of the guide block (103) is arranged in a matching fit. The inclined guide block (103) is slidably assembled inside the guide groove (106). A number of sliding groove holes (108) are opened on the wall of the outer fixing rod (20) corresponding to the position of the guide groove (106). A spring plate (104) is fixedly connected to the inner wall of the sliding groove hole (108). The outer surface of the spring plate (104) is fixedly connected to the inclined guide block (103). A locking block (105) is fixedly connected to the inner surface of the spring plate (104). The locking block (105) is in abutting contact with the outer wall of the inner telescopic rod (21) inside the outer fixing rod (20).

3. The anti-backflow and adjustable-length forceps for removing uterine contents according to claim 1, characterized in that: The end of the clamp base (31) is provided with a U-shaped groove (201). Two sets of arc-shaped clamping claws (30) are hinged in the U-shaped groove (201). The ends of the two sets of arc-shaped clamping claws (30) located in the U-shaped groove (201) are respectively hinged with connecting rods (11). The other end of the connecting rods (11) is hinged to one end of the push-pull rod (10). The other end of the push-pull rod (10) passes through the clamp base (31) and is connected to the inner telescopic rod (21) and the outer fixing rod (20) through the sliding sleeve. After passing through the outer fixing rod (20), it is connected to the handle assembly (1).

4. The anti-backflow and adjustable-length forceps for removing uterine contents according to claim 3, characterized in that: An anti-backflow cavity (32) is fixedly installed in the clamp base (31) on one side of the U-shaped groove (201). One end of the anti-backflow cavity (32) extends out of the clamp base (31) and has several strip holes (202). The other end of the anti-backflow cavity (32) extends out of the clamp base (31) and is fixedly connected to the suction tube (203). The suction tube (203) is fixedly connected inside the inner telescopic rod (21) and is arranged parallel to the push-pull rod (10). The suction tube (203) extends out of the inner telescopic rod (21) and is set inside the outer fixed rod (20), and extends out of the outer wall of the outer fixed rod (20).

5. A uterine cavity contents removal forceps with anti-backflow and adjustable length according to claim 4, characterized in that: A flushing pipe (204) is fixedly installed inside the clamp base (31) on one side of the anti-backflow cavity (32). One end of the flushing pipe (204) is connected to the outer wall of the clamp base (31), and the other end of the flushing pipe (204) is connected to the water supply pipe (208). The water supply pipe (208) is bonded and fixed to the outer wall of the suction pipe (203).

6. A uterine cavity contents removal forceps with anti-backflow and adjustable length according to claim 5, characterized in that: A camera (205) is fixedly installed in the pliers base (31) on the other side of the U-shaped groove (201). The lens of the camera (205) is embedded in the end face of the pliers base (31). The camera (205) is electrically connected to a data cable (206). The data cable (206) passes through and connects to the inner telescopic rod (21) and the outer fixing rod (20) in sequence.

7. A uterine cavity contents removal forceps with anti-backflow and adjustable length according to claim 6, characterized in that: A spring tube (207) is coiled around the push-pull rod (10) inside the external fixing rod (20). The suction tube (203), water pipe (208), data cable (206) and air inlet pipe (24) are all slidably inserted inside the spring tube (207).

8. A uterine cavity contents removal forceps with anti-backflow and adjustable length according to claim 1, characterized in that: The ring-shaped cervical sealing airbag (23) is an ultra-thin medical silicone flexible airbag that takes the shape of a frustum after inflation.

9. A uterine cavity contents removal forceps with anti-backflow and adjustable length according to claim 1, characterized in that: The inner walls of both sets of arc-shaped clamping claws (30) are provided with anti-slip biting teeth. The outer side of the arc-shaped clamping claws (30) is made with full-area rounded blunt treatment and has no sharp edges. The opening and closing angle range of the two sets of arc-shaped clamping claws (30) is 0°-45°.

10. A uterine cavity contents removal forceps with anti-backflow and adjustable length according to claim 1, characterized in that: The handle assembly (1) includes a fixed handle (301) and a movable handle (302). The fixed handle (301) is rigidly connected to an outer fixed rod (20). The middle part of the movable handle (302) is hinged to the middle part of the fixed handle (301). A return spring (303) is fixedly connected between the movable handle (302) and the fixed handle (301). A sliding sleeve (304) is embedded in one end of the movable handle (302), and one end of the sliding sleeve (304) is fixed. A locking sleeve (305) is connected. After the push-pull rod (10) passes through the outer fixing rod (20), the sliding sleeve is connected to the sliding sleeve tube (304) and the locking sleeve (305). The outer wall of the locking sleeve (305) is provided with a threaded hole (306). A threaded rod (307) is threadedly connected in the threaded hole (306). One end of the threaded rod (307) abuts against the push-pull rod (10), and the other end of the threaded rod (307) passes through the threaded hole (306) and is fixedly connected to the hand-tightening operating block (308).

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