Pneumoperitoneum needles for laparoscopic surgery and their control methods

Abstract

This invention relates to the field of surgical instruments, and particularly to a pneumoperitoneum needle for laparoscopic surgery and its control method. The pneumoperitoneum needle and its control method provided by this invention, during the puncture phase, activate the electromagnet cylinder for forward operation. The electromagnet cylinder drives the puncture needle tube forward and the inner core backward, ensuring the inner core does not obstruct the puncture needle's insertion. After puncture, the resistance to the puncture needle tube decreases, the pressure sensor's data increases, and the control unit activates the electromagnet cylinder for reverse operation. The electromagnet cylinder drives the puncture needle tube backward and the inner core forward, causing the puncture needle tube to retract instantly and the inner core to extend out, avoiding damage to organs. This method is rapid and efficient, while the interaction between the puncture needle tube and the inner core creates redundancy. When the control unit or the electromagnet cylinder fails to operate, the elastic element can control the inner core in a conventional manner, ensuring a safe puncture process for the pneumoperitoneum needle in laparoscopic surgery.

Description

Technical Field

[0001] This invention relates to the field of surgical instruments, and in particular to a pneumoperitoneum needle for laparoscopic surgery and its control method. Background Technology

[0002] In current technology, the abdominal cavity, as an important anatomical region of the human body, houses multiple organs including the stomach, intestines, liver, gallbladder, spleen, and pancreas, exhibiting a complex structure and diverse functions. In certain disease states, such as tumors, inflammation, or obstruction, surgical intervention and treatment are often necessary. With the development of minimally invasive techniques, laparoscopic surgery has been widely used clinically due to its advantages of minimal trauma and rapid recovery.

[0003] During laparoscopic surgery, carbon dioxide gas is usually injected into the patient's abdominal cavity to establish a stable pneumoperitoneum state in order to obtain a clear surgical field and sufficient operating space. This step is crucial, as the formation of pneumoperitoneum creates a gap between the abdominal wall and the internal organs, facilitating the entry of surgical instruments and the surgeon's delicate manipulation.

[0004] The key instrument used to establish pneumoperitoneum is called a pneumoperitoneum needle. Its function is to penetrate the abdominal cavity in the initial stage of surgery and safely and controllably inject carbon dioxide. A pneumoperitoneum needle typically consists of several core components: an outer sheath, an inner core, and a ventilation control switch. The outer sheath guides and protects the puncture path, the core penetrates the abdominal wall tissue, and the ventilation switch precisely regulates the gas flow and pressure. As a common clinical medical device, the pneumoperitoneum needle ensures the smooth progress of surgery while minimizing tissue damage and surgical risks.

[0005] In general, the inner core of a pneumoperitoneum needle slides through the outer sheath via an elastic element. It is released through the outer sheath by reducing pressure during puncture, providing a protective effect. During this process, the inner core obstructs the puncture of the outer sheath. After penetration, the speed at which the inner core ejects depends on the hardness of the patient or the location. If the inner core does not eject in time, the outer sheath still poses a risk of injury to the patient. Summary of the Invention

[0006] The main objective of this invention is to provide a pneumoperitoneum needle for laparoscopic surgery and its control method, aiming to solve the problems of the internal needle core of the pneumoperitoneum needle obstructing the puncture action of the external sheath during puncture and the problem of the internal needle core not being ejected in time.

[0007] To achieve the above objectives, the present invention provides a pneumoperitoneum needle for laparoscopic surgery, comprising:

[0008] The sleeve section includes a front barrel, a middle electromagnet cylinder, and a rear sleeve connected in sequence. The middle electromagnet cylinder includes a middle sleeve and an electromagnet cylinder disposed inside the middle sleeve.

[0009] A pressure sensor is installed at the bottom inside the front barrel;

[0010] A puncture needle is slidably disposed through the front barrel and the pressure sensor, and one end of the puncture needle located inside the front barrel is connected to a first magnetic ring.

[0011] A fixing sleeve is detachably connected to the rear end of the rear sleeve;

[0012] The inner core includes an air tube and a second magnetic ring. The air tube is slidably disposed through the fixed sleeve, the middle electromagnet cylinder, the rear sleeve and the puncture needle tube. The front end of the air tube is provided with an air outlet. The second magnetic ring is sleeved on the air tube and located between the electromagnet cylinder and the fixed sleeve. When sliding, the air tube extends out and retracts into the puncture needle tube.

[0013] An elastic element is compressed between the second magnetic ring and the fixing sleeve;

[0014] The control unit is electrically connected to the pressure sensor and the electromagnet cylinder;

[0015] The electromagnet cylinder simultaneously attracts or repels the first magnetic ring and the second magnetic ring.

[0016] Furthermore, a switching switch for controlling the direction of the current inside the electromagnet cylinder is provided on the outer wall of the middle sleeve.

[0017] Furthermore, the first magnetic ring and the second magnetic ring are rare-earth permanent magnets.

[0018] Furthermore, an air valve switch is provided at the rear end of the air tube.

[0019] Furthermore, the middle electromagnet cylinder is connected to the front barrel and the rear sleeve by a threaded connection or a snap-fit ​​connection.

[0020] Furthermore, the elastic element is a helical spring.

[0021] Furthermore, the central electromagnet cylinder includes a mobile power source for supplying power to the electromagnet cylinder.

[0022] Furthermore, the control unit is equipped with an adjustment switch for adjusting the working voltage of the electromagnet cylinder.

[0023] The present invention also provides a control method for the above-mentioned pneumoperitoneum needle used in laparoscopic surgery, comprising:

[0024] S1. Control the electromagnet cylinder to work in the forward direction and continuously receive the sensing data from the pressure sensor, wherein the puncture needle and the inner core move away from the electromagnet cylinder.

[0025] S2. Select whether to control the electromagnet cylinder to work in reverse based on the sensor data, wherein the puncture needle and the inner core move close to the electromagnet cylinder.

[0026] Further, step S2 includes:

[0027] When the value of the sensing data is less than the first preset pressure, and the continuously received sensing data is greater than the second preset pressure, the electromagnet cylinder is controlled to work in reverse. The first preset pressure is less than the second preset pressure, and the second preset pressure corresponds to the sensing data of the pressure sensor when the puncture needle does not perform a puncture action.

[0028] The pneumoperitoneum needle for laparoscopic surgery and its control method provided by this invention, during the puncture stage, the control unit activates the electromagnet cylinder to operate in the forward direction. The electromagnet cylinder drives the puncture needle tube forward and the inner core backward, and the inner core does not obstruct the puncture action of the puncture needle tube. After the puncture is completed, the resistance to the puncture needle tube decreases, the sensing data of the pressure sensor increases, and the control unit activates the electromagnet cylinder to operate in the reverse direction. The electromagnet cylinder drives the puncture needle tube backward and the inner core forward. The puncture needle tube retracts instantly and the inner core extends out of the puncture needle tube, avoiding damage to organs. While being rapid and efficient, the puncture needle tube and the inner core interact to form redundancy. When the control unit and the electromagnet cylinder are working normally, the elastic element provides working assistance. When the control unit or the electromagnet cylinder cannot work, the elastic element can control the inner core in a traditional way, ensuring that the pneumoperitoneum needle for laparoscopic surgery can complete a safe puncture process. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of a pneumoperitoneum needle for laparoscopic surgery according to an embodiment of the present invention;

[0030] Figure 2 This is a cross-sectional schematic diagram of a pneumoperitoneum needle for laparoscopic surgery according to an embodiment of the present invention (the electromagnet cylinder is working in the forward direction).

[0031] Figure 3 yes Figure 2 Enlarged view of section A in the middle;

[0032] Figure 4 yes Figure 2 Enlarged view of section B;

[0033] Figure 5 This is a schematic cross-sectional view of the cannula portion of a pneumoperitoneum needle used in laparoscopic surgery according to an embodiment of the present invention;

[0034] Figure 6 This is a cross-sectional schematic diagram of the puncture needle tube in a pneumoperitoneum needle for laparoscopic surgery according to an embodiment of the present invention;

[0035] Figure 7 This is a schematic cross-sectional view of the inner core of a pneumoperitoneum needle for laparoscopic surgery according to an embodiment of the present invention;

[0036] Figure 8 This is a cross-sectional schematic diagram of a pneumoperitoneum needle for laparoscopic surgery according to an embodiment of the present invention (the electromagnet cylinder operates in reverse).

[0037] Figure 9 yes Figure 8 Enlarged view of section C;

[0038] Figure 10 yes Figure 8 Enlarged view of section D in the middle. Detailed Implementation

[0039] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0040] Those skilled in the art will understand that, unless specifically stated otherwise, the singular forms “a,” “an,” “the,” “the,” and “the” used herein may also include the plural forms. It should be further understood that the term “comprising” as used in this specification means the presence of the stated features, integers, steps, operations, elements, units, modules, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, units, modules, components, and / or groups thereof. It should be understood that when we say an element is “connected” or “coupled” to another element, it can be directly connected or coupled to the other element, or there may be intermediate elements. Furthermore, “connected” or “coupled” as used herein can include wireless connection or wireless coupling. The term “and / or” as used herein includes all or any of the units and all combinations of one or more associated listed items.

[0041] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art and should not be interpreted in an idealized or overly formal sense unless specifically defined as herein.

[0042] Reference Figures 1 to 10 In one embodiment of the present invention, a pneumoperitoneum needle for laparoscopic surgery includes:

[0043] The sleeve section 100 includes a front barrel 110, a middle electromagnet cylinder 120 and a rear sleeve 130 connected in sequence. The middle electromagnet cylinder 120 includes a middle sleeve 121 and an electromagnet cylinder 122 disposed in the middle sleeve 121.

[0044] Pressure sensor 200 is installed at the bottom inside the front barrel 110;

[0045] The puncture needle 300 is slidably disposed through the front barrel 110 and the pressure sensor 200, and one end of the puncture needle 300 located inside the front barrel 110 is connected to a first magnetic ring 310.

[0046] The fixing sleeve 400 is detachably connected to the rear end of the rear sleeve 130;

[0047] The inner core 500 includes an air tube 510 and a second magnetic ring 520. The air tube 510 is slidably disposed through the fixing sleeve 400, the middle electromagnet cylinder 120, the rear sleeve 130 and the puncture needle tube 300. The front end of the air tube 510 is provided with an air outlet. The second magnetic ring 520 is sleeved on the air tube 510 and located between the electromagnet cylinder 122 and the fixing sleeve 400. When sliding, the air tube 510 extends out and retracts into the puncture needle tube 300.

[0048] The elastic element 600 is compressed between the second magnetic ring 520 and the fixed sleeve 400;

[0049] The control unit 700 is electrically connected to the pressure sensor 200 and the electromagnet cylinder 122;

[0050] The electromagnet cylinder 122 simultaneously attracts or repels the first magnetic ring 310 and the second magnetic ring 520.

[0051] In the existing technology, the inner needle core hinders the puncture action of the outer sheath during the puncture process. After penetration, the speed at which the inner needle core ejects is related to the hardness of different patients or different sites. If the inner needle core does not eject in time, the outer sheath still poses a risk of injuring the patient.

[0052] The pneumoperitoneum needle for laparoscopic surgery provided by the present invention includes a cannula 100, a pressure sensor 200, a puncture needle tube 300, a fixing sleeve 400, an inner core 500, an elastic element 600, and a control part 700.

[0053] The cannula section 100 includes a front barrel 110, a middle electromagnet cylinder 120, and a rear sleeve 130 connected in sequence. The connection method between the front barrel 110, the middle electromagnet cylinder 120, and the rear sleeve 130 is not limited. The bottom, or front end, of the front barrel 110 can be fitted with a guide tube 111 to assist in stabilizing the sliding position of the subsequent puncture needle 300. The middle electromagnet cylinder 120 includes a middle sleeve 121 and an electromagnet cylinder 122 disposed within the middle sleeve 121. The electromagnet cylinder 122 is composed of coils, with different conductive directions providing magnetic fields in different directions. The electromagnet cylinder 122 can be self-powered or use an external power source.

[0054] The pressure sensor 200 is installed at the bottom inside the front barrel 110. The pressure sensor 200 can operate in various ways, such as piezoelectric. The pressure sensor 200 can be fixed to the bottom of the front barrel 110 by adhesive or snap-fit.

[0055] The puncture needle 300 is slidably positioned through the front barrel 110 and the pressure sensor 200. A sliding range of 3 to 7 millimeters is suitable for the puncture needle 300. A first magnetic ring 310 is connected to one end of the puncture needle 300 located inside the front barrel 110. The first magnetic ring 310 can be made of ordinary magnetic material or rare-earth permanent magnet material, depending on its ability to provide magnetic force. The first magnetic ring 310 does not affect the through-channel in the middle of the puncture needle 300.

[0056] The retaining sleeve 400 is detachably connected to the rear end of the rear sleeve 130. The connection between the retaining sleeve 400 and the rear sleeve 130 is either threaded or snap-fit. The retaining sleeve 400 provides a base for fixing the inner core 500.

[0057] The inner core 500 includes an air tube 510 and a second magnetic ring 520. The air tube 510 is slidably disposed through the fixing sleeve 400, the middle electromagnet cylinder 120, the rear sleeve 130, and the puncture needle tube 300. An air outlet is provided at the front end of the air tube 510, and the second magnetic ring 520 is sleeved on the air tube 510 and located between the electromagnet cylinder 122 and the fixing sleeve 400. The sliding range of the second magnetic ring 520 within the sleeve portion 100 is preferably 10 to 20 millimeters. The material of the first magnetic ring 310 can be a common magnetic material or a rare-earth permanent magnet material, depending on its ability to provide magnetic force. Gas introduced at the rear end of the air tube 510 is discharged from the air outlet. During sliding, the air tube 510 extends and retracts into the puncture needle tube 300.

[0058] The elastic element 600 is compressed between the second magnetic ring 520 and the fixed sleeve 400. The elastic element 600 provides the safety function of a conventional pneumoperitoneum needle, provides redundancy for the operation of the central electromagnet cylinder 120, and improves the safety of use.

[0059] The control unit 700 is electrically connected to the pressure sensor 200 and the electromagnet cylinder 122. The electromagnet cylinder 122 simultaneously attracts or repels the first magnetic ring 310 and the second magnetic ring 520. The control unit 700 can be controlled by a chip circuit with a preset program.

[0060] During the work process:

[0061] During the puncture phase, the control unit 700 is activated, and the electromagnet cylinder 122 is started to operate in the forward direction. The electromagnet cylinder 122 drives the puncture needle 300 forward and the inner core 500 backward (i.e., the puncture needle 300 and the inner core 500 move away from the electromagnet cylinder 122). The elastic element 600 is compressed, and the inner core 500 retracts into the puncture needle 300, allowing the puncture needle 300 to stably perform the puncture action. The control unit 700 continuously receives sensing data from the pressure sensor 200.

[0062] After the puncture is completed, the resistance to the puncture needle 300 decreases, and the sensing data of the pressure sensor 200 increases. The control unit 700 activates the electromagnet cylinder 122 to work in reverse. The electromagnet cylinder 122 drives the puncture needle 300 backward and the inner core 500 forward (that is, the puncture needle 300 and the inner core 500 move closer to the electromagnet cylinder 122). The elastic element 600 releases the elastic force, and the puncture needle 300 retracts instantly while the inner core 500 extends out of the puncture needle 300, avoiding damage to the organs.

[0063] When the control unit 700 and the electromagnet cylinder 122 are working normally, the elastic element 600 provides working assistance; when the control unit 700 or the electromagnet cylinder 122 fails to work, the elastic element 600 can control the inner core 500 in a conventional manner to ensure that the pneumoperitoneum needle for laparoscopic surgery can complete a safe puncture process.

[0064] In summary, during the puncture phase, the control unit 700 activates the electromagnet cylinder 122 to operate in the forward direction. The electromagnet cylinder 122 drives the puncture needle 300 forward and the inner core 500 backward, without obstructing the puncture action of the puncture needle 300. After the puncture is completed, the resistance to the puncture needle 300 decreases, the sensing data of the pressure sensor 200 increases, and the control unit 700 activates the electromagnet cylinder 122 to operate in the reverse direction. The electromagnet cylinder 122 drives the puncture needle 300 backward and the inner core 500 forward. The puncture needle 300 retracts instantly while the inner core 500 extends, avoiding damage to organs. This rapid and efficient action, combined with the interaction between the puncture needle 300 and the inner core 500, creates redundancy. When the control unit 700 and the electromagnet cylinder 122 are functioning normally, the elastic element 600 provides operational assistance. When the control unit 700 or the electromagnet cylinder 122 fails to function, the elastic element 600 can control the inner core 500 in a conventional manner, ensuring a safe puncture process for the pneumoperitoneum needle used in laparoscopic surgery.

[0065] In one embodiment, a switching switch for controlling the direction of current inside the electromagnet cylinder 122 is provided on the outer wall of the central sleeve 121.

[0066] In the aforementioned embodiment, the operation of the electromagnet cylinder 122 is controlled by the control unit 700 based on the sensing data from the pressure sensor 200, thereby moving the inner core 500 and the puncture needle 300 to appropriate positions under different conditions. In this embodiment, a switching switch is provided to offer an additional operating mode or additional redundancy. During puncture using a pneumoperitoneum needle for laparoscopic surgery, the electromagnet cylinder 122 drives the puncture needle 300 forward and the inner core 500 backward by controlling the switching switch; after the user feels the puncture is complete, the electromagnet cylinder 122 drives the puncture needle 300 backward and the inner core 500 forward by controlling the switching switch.

[0067] In one embodiment, the first magnetic ring 310 and the second magnetic ring 520 are rare earth permanent magnets.

[0068] In this embodiment, the first magnetic ring 310 and the second magnetic ring 520 are restricted to rare earth permanent magnets to provide stable magnetic force and provide a basis for the operation of the electromagnet cylinder 122.

[0069] In one embodiment, an air valve switch is provided at the rear end of the air pipe 510.

[0070] In this embodiment, an air valve switch is provided at the rear end of the trachea 510, thereby providing a basis for medical personnel to operate on the trachea 510 and avoiding complete control of airflow through an external air source.

[0071] In one embodiment, the middle electromagnet cylinder 120 is connected to the front barrel 110 and the rear sleeve 130 by a threaded connection or a snap-fit ​​connection.

[0072] In this embodiment, two connection methods for the central electromagnet cylinder 120 are provided, which have the advantages of being convenient and reliable.

[0073] In one embodiment, the elastic element 600 is a helical spring.

[0074] In this embodiment, the elastic element 600 is constrained to be a helical spring, thereby providing a more stable and linear elastic force.

[0075] In one embodiment, the central electromagnet cylinder 120 includes a mobile power source that supplies power to the electromagnet cylinder 122.

[0076] In this embodiment, the power bank can be rechargeable, providing convenience for use. The power bank can also supply power to the control unit 700.

[0077] In one embodiment, the control unit 700 is provided with an adjustment switch for adjusting the operating voltage of the electromagnet cylinder 122.

[0078] In this embodiment, the adjustment switch can be adjusted according to usage habits and patient characteristics, and the magnetic force provided by the electromagnet cylinder 122 can be adjusted.

[0079] The present invention also provides a control method for the above-mentioned pneumoperitoneum needle used in laparoscopic surgery, comprising:

[0080] S1. Control the electromagnet cylinder 122 to work in the forward direction and continuously receive the sensing data from the pressure sensor 200, wherein the puncture needle tube 300 and the inner core 500 move away from the electromagnet cylinder 122.

[0081] S2. Select whether to control the electromagnet cylinder 122 to work in reverse according to the sensor data, wherein the puncture needle tube 300 and the inner core 500 move close to the electromagnet cylinder 122.

[0082] In this embodiment, during step S1, at the puncture stage, the control unit 700 is activated. The control unit 700 starts the electromagnet cylinder 122 to operate in the forward direction. The electromagnet cylinder 122 drives the puncture needle 300 forward and the inner core 500 backward, compressing the elastic member 600. The inner core 500 retracts into the puncture needle 300, and the puncture needle 300 can stably perform the puncture action. The control unit 700 continuously receives sensing data from the pressure sensor 200.

[0083] In step S2, after the puncture is completed, the resistance to the puncture needle 300 decreases, and the sensing data of the pressure sensor 200 increases. The control unit 700 activates the electromagnet cylinder 122 to work in reverse. The electromagnet cylinder 122 drives the puncture needle 300 backward and the inner core 500 forward. The elastic element 600 releases the elastic force, and the puncture needle 300 retracts instantly while the inner core 500 extends out of the puncture needle 300, thus avoiding damage to the organs.

[0084] During the puncture phase described above, the puncture needle 300 remains in contact with the skin. The elasticity of the skin causes the puncture needle 300 to tend to move away from the pressure sensor 200. After the puncture is completed, this tendency of the puncture needle 300 to move away from the pressure sensor 200 is significantly reduced. Therefore, the boundary between the puncture phase and the completion of the puncture is sensitively detected through the serial sensing data of the pressure sensor.

[0085] In one embodiment, step S2 includes:

[0086] When the value of the sensing data is less than the first preset pressure, and the continuously received sensing data is greater than the second preset pressure, the electromagnet cylinder 122 is controlled to work in reverse. The first preset pressure is less than the second preset pressure, and the second preset pressure corresponds to the sensing data of the pressure sensor 200 when the puncture needle tube 300 does not perform a puncture action.

[0087] In this embodiment, when the puncture needle 300 does not perform a puncture action, the sensing data of the pressure sensor 200 is the second preset pressure; during the puncture stage, the puncture needle 300 is always in contact with the skin, and the elasticity of the skin makes the puncture needle 300 tend to move away from the pressure sensor 200. Therefore, the first preset pressure is 3 to 8 Newtons smaller than the second preset pressure to correspond to the puncture process.

[0088] In summary, the pneumoperitoneum needle for laparoscopic surgery and its control method provided by this invention, during the puncture stage, the control unit 700 activates the electromagnet cylinder 122 to operate in the forward direction. The electromagnet cylinder 122 drives the puncture needle tube 300 forward and the inner core 500 backward, and the inner core 500 does not obstruct the puncture action of the puncture needle tube 300. After the puncture is completed, the resistance to the puncture needle tube 300 decreases, the sensing data of the pressure sensor 200 increases, and the control unit 700 activates the electromagnet cylinder 122 to operate in the reverse direction, driving the puncture needle tube 300 backward. By driving the inner core 500 forward, the puncture needle 300 retracts instantly while the inner core 500 extends beyond the puncture needle 300, thus avoiding damage to organs. This rapid and efficient action, combined with the interaction between the puncture needle 300 and the inner core 500, creates redundancy. When the control unit 700 and the electromagnet cylinder 122 fail to function, the elastic element 600 provides operational assistance. When either the control unit 700 or the electromagnet cylinder 122 fails to function, the elastic element 600 can control the inner core 500 in a conventional manner, ensuring a safe puncture process for the pneumoperitoneum needle used in laparoscopic surgery.

[0089] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A pneumoperitoneum needle for abdominal paracentesis, characterized in that, include: The sleeve section (100) includes a front barrel (110), a middle electromagnet cylinder (120) and a rear sleeve (130) connected in sequence. The middle electromagnet cylinder (120) includes a middle sleeve (121) and an electromagnet cylinder (122) disposed in the middle sleeve (121). A pressure sensor (200) is installed at the bottom inside the front barrel (110); A puncture needle (300) is slidably disposed through the front barrel (110) and the pressure sensor (200), and one end of the puncture needle (300) located inside the front barrel (110) is connected to a first magnetic ring (310). A retaining sleeve (400) is detachably connected to the rear end of the rear sleeve (130); The inner core (500) includes an air tube (510) and a second magnetic ring (520). The air tube (510) is slidably disposed through the fixed sleeve (400), the middle electromagnet cylinder (120), the rear sleeve (130), and the puncture needle tube (300). The front end of the air tube (510) is provided with an air outlet. The second magnetic ring (520) is sleeved on the air tube (510) and located between the electromagnet cylinder (122) and the fixed sleeve (400). When sliding, the air tube (510) extends out and retracts into the puncture needle tube (300). The elastic element (600) is compressed between the second magnetic ring (520) and the fixing sleeve (400); The control unit (700) is electrically connected to the pressure sensor (200) and the electromagnet cylinder (122). The electromagnet cylinder (122) simultaneously attracts or repels the first magnetic ring (310) and the second magnetic ring (520). The control unit (700) is equipped with an adjustment switch for adjusting the working voltage of the electromagnet cylinder (122).

2. The pneumoperitoneum needle for abdominal paracentesis according to claim 1, characterized in that, A switching switch for controlling the direction of current inside the electromagnet cylinder (122) is provided on the outer wall of the middle sleeve (121).

3. The pneumoperitoneum needle for abdominal paracentesis according to claim 1 or 2, characterized in that, The first magnetic ring (310) and the second magnetic ring (520) are rare earth permanent magnets.

4. The pneumoperitoneum needle for abdominal paracentesis according to claim 1, characterized in that, An air valve switch is provided at the rear end of the air pipe (510).

5. The pneumoperitoneum needle for abdominal paracentesis according to claim 1 or 2, characterized in that, The middle electromagnet cylinder (120) is connected to the front barrel (110) and the rear sleeve (130) by a threaded connection or a snap-fit ​​connection.

6. The pneumoperitoneum needle for abdominal paracentesis according to claim 1 or 2, characterized in that, The elastic element (600) is a helical spring.

7. The pneumoperitoneum needle for abdominal paracentesis according to claim 1 or 2, characterized in that, The central electromagnet cylinder (120) includes a mobile power source that supplies power to the electromagnet cylinder (122).

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