Disposable trocar

Abstract

The present invention relates to a disposable puncture device, which belongs to the field of medical devices and is a laparoscopic supporting surgical instrument suitable for laparoscopic examination and establishment of surgical working channels. It includes a locking cap, a puncture sleeve assembly, a locking sealing cap assembly, a locking switch, an air blocking sealing cap, an air injection valve, an air injection switch, a positioning ring, a one-way valve, a sealing patch and an air bag; the puncture sleeve assembly is composed of a puncture sleeve seat and a puncture sleeve, and the locking sealing cap assembly has a sleeve elastic sealing cap, a sleeve sealing cap mounting seat, a locking fixing cover, and a lower pressing cover. A ventilation groove is arranged on the outside of the puncture sleeve, and the ventilation groove extends forward to the front part of the puncture sleeve along the axial direction of the puncture sleeve and passes through the wire binding groove; the air bag is installed at the front end of the puncture sleeve and is fixed to the outer periphery of the wire binding groove by bundling, and the air outlet arranged on the sealing patch is used to transport compressed air to the air bag to inflate the air bag; the positioning ring is set on the middle part of the puncture sleeve.

Description

Technical Field

[0001] The invention relates to a disposable trocar, which belongs to the field of medical instruments and is a laparoscopic matching surgical instrument suitable for laparoscopic examination and establishment of surgical working channels. Background Art

[0002] A trocar is a surgical instrument that pierces the abdominal wall and provides a channel for other surgical instruments to enter the body cavity. It is a minimally invasive surgical instrument. Currently, the trocar is a single-hole straight tube structure, which is easy to swing during use and may fall out of the human body, thus delaying the operation. The slippage of the trocar affects the operation process, aggravates the trauma of the patient, and delays the patient's recovery.

[0003] In order to solve the problems existing in the prior art, a patent application "balloon puncture device" is proposed, which includes a puncture sleeve, a puncture sleeve and a puncture rod inserted in the puncture sleeve. The puncture sleeve includes a cylindrical hard sleeve body, one end of the hard sleeve body is provided with a sleeve seat for the puncture rod to pass through, and a soft coated sleeve body made of soft material is sleeved on the circumferential outer side of the hard sleeve body. The circumferential outer side of the soft coated sleeve body is sleeved with a constraint structure that can constrain the circumferential outer side of the soft coated sleeve body to prevent its circumferential expansion. The circumferential outer side of the soft coated sleeve body is constrained by the constraint structure, which prevents the circumferential expansion of the soft coated sleeve body when the balloon is inflated or filled with liquid, so that the balloon can be inflated smoothly, thereby achieving the purpose of secure fixation. Its complex structure affects the mutual connection between the soft coated sleeve body and the constraint sleeve body, which is relatively difficult to process and increases the use effect of the puncture sleeve diameter. Summary of the invention

[0004] The purpose of the present invention is to provide a disposable puncture device in view of the above-mentioned deficiencies, which has a locking cap, a puncture sleeve assembly, a locking sealing cap assembly, a locking switch, an air blocking sealing cap, an air injection valve, an air injection switch, a positioning ring, a one-way valve, a sealing patch, and an air bag. The device has a compact structure, is safe and effective to use, can greatly reduce the wound area in clinical surgery, greatly shorten the operation time, is easy to operate, reduces the patient's bleeding and postoperative infection, and improves the quality of surgery, with less postoperative pain and faster healing. Due to the use of a positioning ring and an air bag, which are fixed structures that clamp the puncture device from the inside and outside of the human body respectively, the puncture device is firmly fixed after being inserted into the human body, is not easy to fall off during the operation, and the clamping position can be conveniently adjusted by a positioning ring made of an elastic soft material.

[0005] The disposable trocar is realized by adopting the following technical solutions:

[0006] The disposable puncture device comprises a locking cap, a puncture sleeve assembly, a locking sealing cap assembly, a locking switch, an air-blocking sealing cap, an air injection valve, an air injection switch, a positioning ring, a one-way valve, a sealing patch and an air bag.

[0007] The puncture cannula assembly consists of a puncture cannula seat and a puncture cannula. An air-blocking sealing cap installation groove is arranged at the lower inner part of the puncture cannula seat, and a locking sealing cap assembly installation groove is arranged at the upper part of the puncture cannula seat. The air-blocking sealing cap is installed in the air-blocking sealing cap installation groove of the puncture cannula, and the locking sealing cap assembly is installed in the locking sealing cap assembly installation groove at the upper part of the puncture cannula seat, and is sealed and fixed by means of a locking cover cap and a sealing ring.

[0008] The locking sealing cap assembly comprises a sleeve elastic sealing cap, a sleeve sealing cap mounting seat, a locking fixing cover and a lower pressing cover. The sleeve elastic sealing cap is mounted on the sleeve sealing cap mounting seat and is locked and fixed by the locking fixing cover. The lower part of the sleeve sealing cap mounting seat is provided with a lower pressing cover. The sleeve elastic sealing cap has an elastic sealing function and can be adjusted to suit different surgical instruments. The sleeve elastic sealing cap is inserted through the locking sealing assembly.

[0009] The locking cap and the sealing ring can be fixed together by ultrasonic welding on the upper part of the puncture sleeve seat. Two locking hooks are arranged at the lower part of the sealing ring. Two locking hook installation holes are arranged at the upper part of the puncture sleeve seat for the locking hook to be inserted and fixed. A locking switch installation hole is arranged at the upper part of the puncture sleeve seat, and the locking switch is inserted in the locking switch installation hole to lock and fix the locking cap, the sealing ring and the locking sealing cap assembly on the puncture sleeve seat.

[0010] The sleeve elastic sealing cap has multiple conical silicone sheets and silicone pads. The conical silicone sheets are mounted on the silicone pads and pressed into the sleeve elastic sealing cap. The sleeve elastic sealing cap has elastic wrinkles and is conical. A mounting hole is provided at the bottom of the sleeve elastic sealing cap.

[0011] The sleeve sealing cap mounting seat is provided with a mounting column and a mounting hole for mounting the sleeve elastic sealing cap.

[0012] The locking and fixing cover is provided with a locking column and a locking hole for installing a locking sleeve elastic sealing cap.

[0013] The lower gland is provided with a mounting compression column and a support ring for supporting the elastic sealing cap of the shaping sleeve.

[0014] The gas-blocking sealing cap is a conical sealing cap made of elastic soft material and is gas-blocking and sealed.

[0015] An injection valve is installed on one side of the puncture cannula seat. The injection valve is equipped with an injection switch, and is provided with an air inlet and an exhaust port. The injection valve is connected to the air source through a pipeline. During the operation, air is injected into the punctured patient's cavity through the injection valve to form pneumoperitoneum, which facilitates the operation.

[0016] The outer side of the puncture sleeve is provided with a ventilation groove, which extends forward to the front part of the puncture sleeve along the axial direction of the puncture sleeve and passes through the wire tying groove. Two wire tying grooves are provided on the outer periphery of the front end of the puncture sleeve.

[0017] A one-way valve is installed at the lower part of the puncture sleeve seat, and the air outlet of the one-way valve is connected to the ventilation groove outside the puncture tube. The sealing patch is sealed and covered on the outside of the ventilation groove of the puncture sleeve, and an air delivery groove is arranged on the inside of the sealing patch, so that the ventilation groove forms an air delivery channel. A fixing block is arranged at one end of the sealing patch and is inserted and fixed at the bottom of the one-way valve, and a wire tying groove and an air outlet corresponding to the front end of the puncture tube are arranged at the other end of the sealing patch, so as to facilitate the fixing of the airbag by tying the wire and supplying air to the airbag through the air outlet.

[0018] The sealing patch is pasted or ultrasonically welded to seal and cover the outside of the ventilation groove of the puncture sleeve, so that the ventilation groove forms an air transmission channel.

[0019] The air bag is installed at the front end of the puncture sleeve and fixed to the outer periphery of the wire binding groove by bundling. The air outlet hole arranged on the sealing patch is used to convey compressed air to the air bag to inflate the air bag.

[0020] The positioning ring is mounted on the middle part of the puncture cannula. During the operation, when the puncture cannula is inserted into the patient's cavity, the one-way valve flushes air into the airbag through the ventilation groove and the air outlet hole on the ventilation seal. After the airbag is filled with air, the position of the positioning ring is adjusted, and the puncture device is clamped on the patient's cavity tissue through the positioning ring and the airbag mounted on the puncture cannula without shaking, which is convenient for surgical instruments to perform surgical operations. When the operation is completed, the air injection valve is closed, the air injection switch is turned on, the air in the cavity is released, and the valve core of the one-way inflation valve is pressed to discharge the air in the airbag, and then the puncture cannula is taken out from the patient's cavity wall.

[0021] The one-way valve is a one-way air injection valve. The one-way valve comprises a valve body, a valve seat, a valve core, a sealing ring, and a spring. The sealing ring is installed on the valve core, and the spring presses the valve core sealing ring against the valve seat of the valve body to achieve one-way sealing. The air inlet of the valve body is connected to the air injection pipe and the compressed air source.

[0022] The airbag is made of elastic soft film material.

[0023] The positioning ring is made of elastic soft material.

[0024] How it works

[0025] When the disposable trocar is used, it is equipped with a puncture cone. The disposable trocar, as a supporting surgical instrument for laparoscopy, should first establish pneumoperitoneum, then make a small incision at a suitable position in the abdomen, fix the disposable trocar by hand at a suitable angle on the raised abdomen with pneumoperitoneum, insert the puncture sleeve of the disposable trocar together with the puncture cone into the small incision, press the puncture cone handle cap of the puncture cone by hand to cover the upper cover and press down, as the puncture cone uses the front end puncture knife to pierce the lower layer of the soft tissue, the tapered bevel surface of the lower part of the puncture sleeve enters the soft tissue, and the puncture knife cone passes through the patient's abdominal soft tissue to the abdominal cavity. At this time, the puncture sleeve is inserted into the abdominal cavity along with the puncture cone to the middle of the puncture sleeve.

[0026] The puncture cone is pulled out from the puncture cannula, and the valve switch on the upper part of the gas injection valve is opened. The gas is injected into the patient's abdominal cavity from the puncture cannula through the gas inlet, valve core and valve body of the gas injection valve, so that the patient's abdominal cavity bulges, and the valve switch 7 is closed. The abdominal surgical instrument can enter the puncture cannula from the locking cap, sealing ring, cannula elastic sealing cap and air-blocking sealing cap of the disposable puncture instrument, and be inserted into the abdominal cavity through the puncture cannula. Due to the multiple seals such as the sealing ring, cannula elastic sealing cap and air-blocking sealing cap, the sealing abdominal surgical instrument has good performance and the gas injected into the abdominal cavity will not leak. The puncture cannula fixing structure that clamps the puncture instrument from the inside and outside of the human body respectively adopts a positioning ring and an air bag. When the puncture instrument penetrates into the human body, it is firmly fixed and will not shake. It is not easy to fall off during the operation, and the clamping position can be conveniently adjusted by the positioning ring made of elastic soft material. After the operation, the surgical instrument is pulled out of the disposable trocar, the valve switch is opened, and the gas injected into the patient's abdominal cavity is discharged from the exhaust port of the gas injection valve. After the injected gas is discharged, the valve core of the one-way valve is pressed to discharge the gas filled in the airbag, and then the puncture cannula is removed from the patient's cavity wall, and the disposable trocar can be pulled out from the patient's abdomen.

[0027] The disposable puncture device has a reasonable design, compact structure, safe and effective use. It can greatly reduce the wound area and greatly shorten the operation time in clinical surgery. It is easy to operate, reduces the patient's bleeding and postoperative infection, and improves the quality of surgery. Postoperative pain is light and healing is fast. Since the puncture cone is provided with a puncture knife, a puncture knife handle, a puncture cone head, a puncture cone lower sleeve, a puncture cone upper sleeve, a puncture cone handle, a firing safety button and a puncture cone handle cap, it can easily penetrate the abdominal tissue without scratching other tissues in the abdominal cavity. Due to the use of multiple seals such as sealing rings, sleeve elastic sealing caps, and air-blocking sealing caps, the sealing abdominal surgical instrument has good performance and the gas injected into the abdominal cavity will not leak. During the operation, the gas injected into the abdominal cavity through the gas injection valve of the disposable puncture device will not leak out during the operation, thereby ensuring that the abdominal surgery is carried out normally and is safe and reliable to use.

[0028] Due to the use of a positioning ring and an air bag, which are used to clamp the puncture sleeve fixing structure of the puncture device from the inside and outside of the human body respectively, the puncture sleeve of the puncture device is firmly fixed after entering the human body without shaking, and is not easy to fall off during the operation. The clamping position can be conveniently adjusted by the positioning ring made of elastic soft material. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention will be further described below in conjunction with the accompanying drawings:

[0030] Figure 1 This is a schematic diagram of a disposable trocar.

[0031] Figure 2 This is a structural breakdown diagram of a disposable trocar.

[0032] Figure 3 It is a schematic diagram of the locking cap structure of a disposable trocar.

[0033] Figure 4 It is a schematic diagram of the structure of a puncture sleeve assembly of a disposable puncture device.

[0034] Figure 5 It is a schematic diagram of the structure of a locking sealing cap assembly of a disposable trocar.

[0035] Figure 6 It is a schematic diagram of the structure of an air-blocking sealing cap of a disposable trocar.

[0036] Figure 7 It is a schematic diagram of the locking switch structure of a disposable trocar.

[0037] Figure 8 It is a schematic diagram of the sealing patch structure of a disposable puncture device.

[0038] Fig. 9 It is a schematic diagram of the sealing ring structure of a disposable puncture device.

[0039] In the figure: 1, locking cap, 2, puncture sleeve assembly, 3, locking sealing cap assembly, 4, locking switch, 5, air blocking sealing cap, 6, air injection valve, 7, air injection switch, 8, positioning ring, 9, one-way valve, 10, sealing patch, 11, air bag, 12, sealing ring, 13, puncture cone;

[0040] 2-1, puncture sleeve seat, 2-2, puncture sleeve, 2-2, puncture sleeve, 2-3, ventilation groove, 2-4, wire binding groove, 2-5, air blocking sealing cap installation groove, 2-6, locking sealing cap assembly installation groove;

[0041] 3-1, casing elastic sealing cap, 3-2, casing sealing cap mounting seat, 3-3, locking fixing cover;

[0042] 9-1, valve body, 9-2, valve seat, 9-3, valve core, 9-4, sealing ring, 9-5, spring;

[0043] 10-1, fixing block, 10-2, wire tying groove, 10-3, air outlet, 10-4, air delivery groove, 12-1, locking hook. DETAILED DESCRIPTION

[0044] See attached Figure 1-9 The disposable puncture device includes a locking cap 1, a puncture sleeve assembly 2, a locking sealing cap assembly 3, a locking switch 4, an air-blocking sealing cap 5, an air injection valve 6, an air injection switch 7, a positioning ring 8, a one-way valve 9, a sealing patch 10 and an air bag 11.

[0045] The puncture sleeve assembly 2 is composed of a puncture sleeve seat 2-1 and a puncture sleeve 2-2. An air-blocking sealing cap installation groove 2-5 is provided at the lower part of the puncture sleeve seat 2-1, and a locking sealing cap assembly installation groove 2-6 is provided at the upper part of the puncture sleeve seat 2-1. The air-blocking sealing cap 5 is installed in the air-blocking sealing cap installation groove 2-5 of the puncture sleeve, and the locking sealing cap assembly 3 is installed in the locking sealing cap assembly installation groove 2-6 at the upper part of the puncture sleeve seat, and is pressed and sealed by the locking cover cap 1 and the sealing ring 12.

[0046] The locking sealing cap assembly 3 comprises a sleeve elastic sealing cap 3-1, a sleeve sealing cap mounting seat 3-2, a locking fixing cover 3-3, and a lower pressing cover 3-4. The sleeve elastic sealing cap 3-1 is mounted on the sleeve sealing cap mounting seat 3-2 and is fixed by locking the locking fixing cover 3-3. The sleeve sealing cap mounting seat 3-2 is provided with a lower pressing cover 3-4. The sleeve elastic sealing cap 3-1 has elastic wrinkles and is conical in shape, and has an elastic sealing function. It has elastic wrinkles and is conical in shape, and can adjust the tightness to adapt to different surgical instruments. The sleeve elastic sealing cap 3-1 inserted through the locking sealing assembly.

[0047] The locking cap 1 and the sealing ring 12 can be fixed together by ultrasonic welding on the upper part of the puncture sleeve seat. Two locking hooks 12-1 are arranged at the lower part of the sealing ring 12. Two locking hook installation holes are arranged at the upper part of the puncture sleeve seat 2-1 for inserting and fixing the locking hooks 12-1. A locking switch installation hole is arranged at the upper part of the puncture sleeve seat 2-1, and the locking switch 4 is inserted in the locking switch installation hole to lock and fix the locking cap 1, the sealing ring 12 and the locking sealing cap assembly 3 on the puncture sleeve seat 2-1.

[0048] The sleeve elastic sealing cap 3-1 has multiple conical silicone sheets and silicone pads. The conical silicone sheets are mounted on the silicone pads and pressed into the sleeve elastic sealing cap 3-1. The sleeve elastic sealing cap 3-1 has elastic wrinkles and is conical. A mounting hole is provided at the bottom of the sleeve elastic sealing cap 3-1.

[0049] The sleeve sealing cap mounting seat 3-2 is provided with a mounting column 3-2-1 and a mounting hole 3-2-2 for mounting the sleeve elastic sealing cap 3-1.

[0050] The locking and fixing cover 3-3 is provided with a mounting locking column 3-3-1 and a mounting locking hole 3-3-2, which are used to mount the locking sleeve elastic sealing cap 3-1.

[0051] The lower pressure cover 3-4 is provided with a mounting compression column 3-4-1 and a support ring 3-4-2, which are used to support the elastic sealing cap 3-1 of the shaping sleeve.

[0052] The gas-blocking sealing cap 5 is a conical sealing cap made of elastic soft material and is gas-blocking and sealed.

[0053] An air injection valve 6 is installed on one side of the puncture sleeve seat 2-1. The air injection valve 6 is equipped with an air injection switch 7, and is provided with an air inlet hole and an air outlet. The air injection valve 6 is connected to the air source through a pipeline. During the operation, air is injected into the punctured patient's cavity through the air injection valve 6 to form pneumoperitoneum, which is convenient for the operation.

[0054] The puncture sleeve 2-2 is provided with a ventilation groove 2-3 on the outside, and the ventilation groove 2-3 extends forward to the front part of the puncture sleeve 2-2 along the axial direction of the puncture sleeve and passes through the wire tying groove. Two wire tying grooves 2-4 are provided on the outer periphery of the front end of the puncture sleeve 2-2.

[0055] A one-way valve 9 is installed at the lower part of the puncture sleeve seat 2-1, and the air outlet of the one-way valve is connected to the ventilation groove 2-3 on the outside of the puncture tube. The sealing patch 10 is sealed and pressed on the outside of the ventilation groove 2-3 of the puncture sleeve 2-2, and the inner side of the sealing patch 10 is provided with an air delivery groove 10-4, so that the ventilation groove 2-3 forms an air delivery channel. A fixing block 10-1 is provided at one end of the sealing patch 10 to be inserted and fixed at the bottom of the one-way valve 9, and a wire tying groove 10-2 and an air outlet 10-3 corresponding to the front end of the puncture tube are provided at the other end of the sealing patch 10, so as to facilitate the fixing of the airbag by tying wire, and supply air to the airbag 11 through the air outlet 10-3.

[0056] The sealing patch 10 is pasted or ultrasonically welded to seal and cover the outer side of the ventilation groove 2-3 of the puncture sleeve 2-2, so that the ventilation groove 2-3 forms a gas transmission channel.

[0057] The airbag 11 is installed at the front end of the puncture sleeve 2-2 and fixed to the outer periphery of the wire binding groove 2-4 by bundling. The air outlet 10-3 provided on the sealing patch 10 is used to transport compressed air to the airbag 11 to inflate the airbag 11.

[0058] The positioning ring 8 is mounted on the middle part of the puncture sleeve 2-2. During the operation, when the puncture sleeve 2-2 is inserted into the patient's cavity, the one-way valve 9 inflates the air bag 11 through the venting groove 2-3 and the air outlet on the sealing patch 10. After the air bag 11 is filled with air, the position of the positioning ring 8 is adjusted, and the puncture device is clamped on the patient's cavity tissue through the positioning ring 8 and the air bag 11 mounted on the puncture sleeve 2-2, so that it will not shake, which is convenient for surgical instruments to perform surgical operations. When the operation is completed, the gas injection valve 6 is closed, the gas injection switch 7 is turned on, the gas in the cavity is released, and then the valve core of the one-way valve 9 is pressed to discharge the gas in the air bag 11, and then the puncture sleeve 2-2 is taken out from the patient's cavity wall.

[0059] The one-way valve 9 is a one-way air injection valve. The one-way valve 9 comprises a valve body 9-1, a valve seat 9-2, a valve core 9-3, a sealing ring 9-4, and a spring 9-5. The sealing ring 9-4 is installed on the valve core 9-3. The spring 9-4 presses the valve core 9-3 and the sealing ring 9-4 against the valve seat 9-2 of the valve body to achieve one-way sealing. The air inlet of the valve body is connected to the air injection pipe and is connected to the compressed air source.

[0060] The airbag 11 is made of elastic soft film material.

[0061] The positioning ring 8 is made of elastic soft material.

[0062] How it works

[0063] When the disposable puncture device is used, it is equipped with a puncture cone 13. The disposable puncture device as a laparoscopic surgical instrument should first establish pneumoperitoneum, then make a small incision at a suitable position in the abdomen, fix the disposable puncture device by hand at a suitable angle on the abdomen with pneumoperitoneum raised, insert the puncture sleeve 2-2 of the disposable puncture device together with the puncture cone into the small incision, press the puncture cone handle cap of the puncture cone by hand to cover the upper cover and press down, as the puncture cone uses the front end puncture knife to pierce the lower layer of the soft tissue, the tapered bevel surface of the lower part of the puncture sleeve enters the soft tissue, and the puncture knife cone passes through the patient's abdominal soft tissue to the abdominal cavity. At this time, the puncture sleeve is inserted into the abdominal cavity along with the puncture cone until the middle of the puncture sleeve 2-2.

[0064] The puncture cone 13 is pulled out from the puncture sleeve 2-2, and the valve switch 7 on the upper part of the gas injection valve 6 is opened. The gas is injected into the patient's abdominal cavity from the puncture sleeve 2-2 through the gas injection valve inlet, valve core, and valve body, so that the patient's abdominal cavity bulges. The valve switch 7 is closed, and the abdominal surgical instrument can enter the puncture sleeve 2-2 from the locking cap 1, sealing ring 12, sleeve elastic sealing cap 3-1, and air blocking sealing cap 5 of the disposable puncture instrument, and is inserted into the abdominal cavity through the puncture sleeve 2-2. Due to the multiple seals such as the sealing ring 12, sleeve elastic sealing cap 3-1, and air blocking sealing cap 5, the sealing performance of the abdominal surgical instrument is good, and the gas injected into the abdominal cavity will not leak. The puncture sleeve 2-2 fixing structure that clamps the puncture instrument from the inside and outside of the human body is adopted. When the puncture instrument penetrates the human body, it is firmly fixed and will not shake. It is not easy to fall off during the operation. The clamping position can be conveniently adjusted by the positioning ring 8 made of elastic soft material. After the operation, the surgical instrument is pulled out from the disposable trocar, the valve switch 7 is opened, and the gas injected into the patient's abdominal cavity is discharged from the exhaust port of the gas injection valve. After the injected gas is discharged, the valve core 9-3 of the one-way valve 9 is pressed to discharge the gas in the air bag 11, and then the puncture sleeve 2-2 is taken out from the patient's cavity wall, and the disposable trocar can be pulled out from the patient's abdomen.

Claims

1. A disposable trocar, characterized in that: It includes a locking cap, a puncture sleeve assembly, a locking sealing cap assembly, a locking switch, an air blocking sealing cap, an air injection valve, an air injection switch, a positioning ring, a one-way valve, a sealing patch and an air bag; The puncture cannula assembly is composed of a puncture cannula seat and a puncture cannula. The lower part of the puncture cannula seat is provided with an air-blocking sealing cap installation groove, and the upper part of the puncture cannula seat is provided with a locking sealing cap assembly installation groove. The air-blocking sealing cap is installed in the air-blocking sealing cap installation groove of the puncture cannula, and the locking sealing cap assembly is installed in the locking sealing cap assembly installation groove on the upper part of the puncture cannula seat, and is sealed and fixed by a locking cap and a sealing ring; The locking sealing cap assembly comprises a sleeve elastic sealing cap, a sleeve sealing cap mounting seat, a locking fixing cover and a lower pressing cover. The sleeve elastic sealing cap is mounted on the sleeve sealing cap mounting seat and is locked and fixed by the locking fixing cover. The lower part of the sleeve sealing cap mounting seat is provided with a lower pressing cover. An air injection valve is installed on one side of the puncture sleeve seat, the air injection valve is equipped with an air injection switch, and is provided with an air inlet hole and an air outlet. The air injection valve is connected to the air source through a pipeline; a ventilation groove is arranged on the outside of the puncture sleeve, and the ventilation groove extends forward along the axial direction of the puncture sleeve to the front part of the puncture sleeve and passes through the wire binding groove; A one-way valve is installed at the lower part of the puncture sleeve seat, and the air outlet of the one-way valve is connected to the ventilation groove outside the puncture tube; the sealing patch is sealed and covered on the outside of the ventilation groove of the puncture sleeve, and an air delivery groove is arranged on the inside of the sealing patch, so that the ventilation groove forms an air delivery channel; The airbag is installed at the front end of the puncture sleeve and fixed to the outer periphery of the wire binding groove by bundling, and the air outlet provided in the sealing patch is used to transport compressed air to the airbag to inflate the airbag; The positioning ring is mounted on the middle part of the puncture sleeve, and the one-way valve inflates the air bag through the venting groove and the air outlet hole on the sealing patch. After the air bag is filled with air, the position of the positioning ring is adjusted, and the puncture device is clamped on the patient's cavity tissue through the positioning ring and the air bag mounted on the puncture sleeve, so that the surgical instrument can perform surgical operations. The sleeve elastic sealing cap comprises a plurality of conical silicone sheets and silicone pads. The conical silicone sheets are mounted on the silicone pads and pressed into the sleeve elastic sealing cap. The sleeve elastic sealing cap has elastic wrinkles and is conical. A mounting hole is arranged at the bottom of the sleeve elastic sealing cap. The casing sealing cap mounting seat is provided with mounting columns and mounting holes for mounting the casing elastic sealing cap; One end of the sealing patch is provided with a fixing block inserted and fixed at the bottom of the one-way valve, and the other end of the sealing patch is provided with a wire tying groove and an air outlet corresponding to the front end of the puncture sleeve, so as to facilitate the fixing of the airbag by tying wire and supplying air to the airbag through the air outlet; The sealing patch is pasted or ultrasonically welded to seal and cover the outside of the ventilation groove of the puncture sleeve, so that the ventilation groove forms an air transmission channel.

2. The disposable trocar according to claim 1, characterized in that: The locking cap and the sealing ring are fixed together by ultrasonic welding. Two locking hooks are arranged on the upper part of the puncture sleeve seat and the lower part of the sealing ring. Two locking hook mounting holes are arranged on the upper part of the puncture sleeve seat for locking hook insertion and fixing. A locking switch mounting hole is arranged on the upper part of the puncture sleeve seat. The locking switch is inserted in the locking switch mounting hole to lock and fix the locking cap, the sealing ring and the locking sealing cap assembly on the puncture sleeve seat.

3. The disposable trocar according to claim 1, characterized in that: The locking and fixing cover is provided with a locking column and a locking hole for installing a locking sleeve elastic sealing cap.

4. The disposable trocar according to claim 1, characterized in that: The lower gland is provided with a mounting compression column and a support ring for supporting the elastic sealing cap of the shaping sleeve.

5. The disposable trocar according to claim 1, characterized in that: The gas blocking sealing cap is a conical sealing cap made of elastic soft material.

6. The disposable trocar according to claim 1, characterized in that: The one-way valve is a one-way air injection valve, which comprises a valve body, a valve seat, a valve core, a sealing ring, and a spring. The sealing ring is installed on the valve core, and the spring presses the valve core sealing ring against the valve seat of the valve body to achieve one-way sealing.

7. The disposable trocar according to claim 1, characterized in that: Two wire tying grooves are arranged on the outer periphery of the front end of the puncture sleeve for tying the airbag.

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