Anti-ramming safety type Verres Anti-ramming safety type Verres

Abstract

The utility model discloses a prevent forward rush safety type gas abdominal needle, containing handle, outer needle, inner needle, safety rebound device, prevent forward rush device and gas passage. The hollow passage of handle, the internal passage of inner needle and gas inlet mechanism constitute gas passage 6. The distal end of outer needle is equipped with prevent forward rush device, and safety rebound device retracts under the action of external force, and inner needle retreats, and the puncture blade edge of outer needle is exposed, and the tissue is punctured, and when the tissue is punctured, safety rebound device releases, and inner needle rebounds, and the protection blunt head extends, and the puncture blade edge is shielded and protected, and simultaneously under the action of prevent forward rush device, the forward rush distance of the utility model discloses a prevent forward rush safety type gas abdominal needle is limited in the safety distance, so that the forward rush phenomenon of the outer needle of the utility model discloses a prevent forward rush safety type gas abdominal needle puncturing peritoneum is effectively controlled, thereby effectively avoiding the accidental damage of surrounding tissue or organ caused by the too large forward rush distance under the inertia.

Description

Technical Field

[0001] This utility model relates to a laparoscopic surgical instrument, and in particular to a pneumoperitoneum needle used in laparoscopic surgery. Background Technology

[0002] Laparoscopic surgery is becoming increasingly widely used, and the prerequisite for minimally invasive surgery is the establishment of pneumoperitoneum to provide space for the operation. Currently, pneumoperitoneum is usually established by inserting a pneumoperitoneum needle and connecting it to a pneumoperitoneum machine to inject gas.

[0003] Typically, after anesthesia, the puncture site is located near the umbilicus or away from the scar. The surgeon lifts the abdominal wall and inserts the needle vertically, judging the puncture depth by two sensations of emptiness: the first sensation penetrates the anterior sheath of the rectus abdominis muscle, and the second sensation penetrates the peritoneum. After confirming that the needle has entered the abdominal cavity, the insufflation tubing is connected, and the pneumoperitoneum machine is turned on to inject CO2 gas into the abdominal cavity to form a pneumoperitoneum.

[0004] Due to the toughness of tissues, especially the peritoneum, a considerable puncture force is required during pneumoperitoneum needle insertion to penetrate the peritoneum and enter the body cavity. Due to inertia, there is a forward thrust at the moment of peritoneal penetration. If this thrust is too great, the pneumoperitoneum needle may penetrate too deeply into the body cavity, potentially causing accidental damage to surrounding tissues or organs upon contact.

[0005] Therefore, existing pneumoperitoneum needles need to be improved to minimize the clinical risks associated with forward thrusting during peritoneal penetration. Summary of the Invention

[0006] The purpose of this invention is to address the clinical risks that may arise from the forward thrust of existing pneumoperitoneum needles during clinical use. This invention uses an anti-forward thrust device located at the distal end of the external needle to limit the forward thrust distance of the pneumoperitoneum needle after penetrating the peritoneum to a specific safe distance, thereby avoiding the clinical risks that may arise from the forward thrust of the pneumoperitoneum needle and making it safer to use in clinical practice.

[0007] The present invention relates to a safety pneumoperitoneum needle with anti-forward thrust, characterized in that: the anti-forward thrust safety pneumoperitoneum needle 100 includes a handle 1, an outer needle 2, an inner needle 3, a safety rebound device 4, an anti-forward thrust device 5, and a gas channel 6.

[0008] A. The handle 1 is hollow and is equipped with an air intake mechanism 11;

[0009] B. The distal end of the outer needle 2 is provided with a puncture blade 21, and the proximal end is connected to the handle 1;

[0010] C. The distal end of the inner needle 3 is a protective blunt tip 31, and an air outlet 32 ​​is provided near the protective blunt tip 31; the inner needle 3 is movably disposed in the working channel 22 of the outer needle 2, and its proximal end is connected to the safety rebound device 4.

[0011] D. The distal end of the outer needle 2 is provided with the anti-forward-rushing device 5;

[0012] E. Under the action of external force, the safety rebound device 4 retracts, the inner needle 3 retracts accordingly, and the puncture edge 21 of the outer needle 2 is exposed to puncture the tissue. After the puncture edge 21 punctures the tissue, under the action of the rebound force of the safety rebound device 4, the inner needle 3 rebounds, and the protective blunt head 31 extends to form a shield and protection for the puncture edge 21. At the same time, under the action of the anti-forward-rushing device 5, the forward-rushing distance of the anti-forward-rushing safety pneumoperitoneum needle 100 is limited to a safe distance. After the external air source is connected, the external gas enters the handle 1 through the air intake mechanism 11 and flows through the inner needle 3, entering the body cavity from the air outlet 32 ​​at the distal end of the inner needle 3. The air intake mechanism 11, the hollow channel of the handle 1, and the internal channel of the inner needle 3 together constitute the gas channel 6.

[0013] Current methods of pneumoperitoneum needle insertion involve the use of inner and outer needles. During puncture, the outer needle's cutting edge is exposed, and after piercing the peritoneum, the inner needle rebounds to shield the outer needle's cutting edge, completing the abdominal wall puncture. In this method, the outer needle 2 punctures in a straight line. Therefore, at the moment the outer needle 2 pierces the peritoneum, the sudden disappearance of the tissue barrier at the tip of the outer needle 2 causes a sudden and significant reduction in resistance, resulting in an instantaneous acceleration of the pneumoperitoneum needle's linear motion. Due to inertia, the outer needle 2 will experience a significant forward thrust at the moment of puncture. If this thrust is too large, it can easily cause accidental damage to the tissues or organs ahead. From a mechanical perspective, the forward thrust distance caused by inertia is directly related to the puncture force, puncture speed, and reaction time after stopping the applied puncture force. Generally, the greater the puncture force, the faster the speed, and the slower the reaction time after stopping the applied puncture force, the longer the forward thrust distance due to sudden acceleration and inertia.

[0014] Therefore, the anti-protrusion device 5 can reduce the protrusion distance of the outer needle 2 of the anti-protrusion safety pneumoperitoneum needle 100 when it pierces the peritoneum by limiting the distance, controlling the puncture force, reducing the puncture speed, and adjusting the movement mode, thereby limiting it to a safe range. This effectively controls the protrusion phenomenon of the outer needle 2 of the anti-protrusion safety pneumoperitoneum needle 100 at the moment of piercing the peritoneum, thereby effectively avoiding accidental damage to surrounding tissues or organs caused by excessive protrusion distance of the anti-protrusion safety pneumoperitoneum needle 100 due to inertia.

[0015] The anti-forward-rushing device 5 is a spiral-type anti-forward-rushing device 5-1. The spiral structure converts the linear forward-pushing force applied to the outer needle 2 into rotational torque, thereby changing the movement of the outer needle 2 from linear to rotational. Even if the peritoneal barrier at the anterior end suddenly disappears, causing a significant reduction in movement resistance, a sudden, large forward rush will not occur. Simultaneously, the concave-convex structure formed between the threads creates a forward-rushing limit, further controlling the forward-rushing distance of the anti-forward-rushing safety pneumoperitoneum needle 100. In practical applications, those skilled in the art can design different anti-forward-rushing technical solutions as needed; the applicant will not provide specific examples here, but all will fall within the scope of protection of this application.

[0016] The spiral-shaped anti-forward-rushing device 5-1 is a self-tapping thread mechanism 51 located at the distal end of the outer needle 3. The self-tapping thread mechanism 51 is located at the distal end of the outer needle 2 through welding, precision machining, or other methods. This self-tapping thread structure has excellent forward penetration capability, easily transforming the traditional linear movement of the outer needle 2 into a rotational forward movement. During puncture, it moves from the abdominal wall into the body cavity via rotation. Because it is spiral-propelled, the movement speed is easily controlled, and acceleration during linear movement is less likely. Especially at the moment of puncture, even if the sudden disappearance of the barrier leads to a significant reduction in resistance, the rotational force applied to the outer needle 2 prevents instantaneous acceleration of the forward linear puncture motion. Furthermore, due to the unique spiral structure of the thread, the concave-convex structure between the threads also serves as a limiting mechanism, ensuring a safe distance.

[0017] The starting thread 51-1 of the self-tapping thread mechanism 51 is attached to the proximal end of the puncture cutting edge 21. To ensure a good puncture effect and reduce the initial resistance of the spiral motion, the starting position of the starting thread 51-1 is attached to the proximal end of the puncture cutting edge 21. Therefore, after the puncture cutting edge 21 enters the abdominal wall, it performs a rotational motion, which not only ensures low movement resistance when puncturing the skin, but also allows for a smooth switch from linear motion to spiral motion. Moreover, the attached design makes the switching of motion mode smoother.

[0018] The self-tapping thread mechanism 51 limits the forward thrust safety distance of the anti-forward thrust safety pneumoperitoneum needle 100 to the thread pitch L. The threads of the self-tapping thread mechanism 51 have a concave-convex structure, which can form a good limiting effect. At the moment of peritoneum puncture, the forward thrust of the outer needle 2 can be limited before the next thread. Therefore, the thread pitch L constitutes the forward thrust safety distance of the anti-forward thrust safety pneumoperitoneum needle 100.

[0019] The pitch L is between 0.2 mm and 10 mm. Normal peritoneum thickness is typically 0.1–0.2 mm, while the thickness of diseased peritoneum is usually several millimeters, less than 10 mm. Therefore, to accommodate different peritoneal thicknesses, the pitch L is typically between 0.2 mm and 10 mm.

[0020] The self-tapping thread mechanism 51 is either a continuous self-tapping thread 51-2 or an intermittent self-tapping thread 51-3. The continuous self-tapping thread 51-2 is a continuous thread structure, which can achieve full-circumference limiting and is easier to process. The intermittent self-tapping thread 51-3 adopts an intermittent thread structure, which is less prone to jamming, and the movement resistance is lower than that of the continuous thread structure, making the process of entering the web wall easier.

[0021] The safety rebound device 4 is a rebound spring 41. The rebound spring 41 can be directly installed inside the handle 1, with its distal end connected to the proximal end of the inner needle 3, and its proximal end abutting against the inner wall of the proximal end of the handle 1. It uses its own elasticity to compress and release, without the need for additional mechanisms, and the structure is very simple.

[0022] The spring 41 is disposed on the handle 1. The distal end of the spring 41 is connected to the inner needle 3, and the proximal end of the spring 41 abuts against the inner wall of the handle 1. Under the action of external force, the spring 41 is compressed, the inner needle 3 retracts, and the puncture edge 21 of the outer needle 2 is exposed to puncture the tissue. After the puncture edge 21 punctures the tissue, the compressed spring 41 releases and rebounds, and the protective blunt head 31 extends to form a shield and protection for the puncture edge 21.

[0023] The anti-puffing safety pneumoperitoneum needle 100 also includes a warning device 7. The warning device 7 can provide indication or warning of the puncture status of the anti-puffing safety pneumoperitoneum needle 100.

[0024] The warning device 7 provides prompts or warnings regarding the puncture process of the anti-pneumoperitoneal needle 100 through color, and / or sound, and / or movement. The warning device 7 can provide prompts or warnings regarding the puncture process of the anti-pneumoperitoneal needle 100 through one or more of the above methods. The applicant has only illustrated the above-mentioned warning methods here. In practical applications, those skilled in the art can design different warning methods as needed. The applicant will not list them all here, but none of them depart from the scope of protection of this application.

[0025] The warning device 7 is an indicator block 71, which is connected to the safety rebound device 4. The safety rebound device 4 moves synchronously with the indicator block 71, and the movement of the indicator block 71 provides prompts or warnings during the puncture process of the anti-puffing safety pneumoperitoneum needle 100. Typically, the indicator block 71 is made of bright colors such as green or red so that its position can be clearly observed during operation to determine the puncture status of the anti-puffing safety pneumoperitoneum needle 100.

[0026] The warning device 7 also includes a positioning block 72, which is located at the distal end of the indicator block 71. After the indicator block 71 resets to its distal end, it impacts the positioning block 72 to produce a sound, providing a warning. The positioning block 72 is located at the distal end of the handle 1 near the inner wall. The inner needle 3 passes through the center of the positioning block 72 and can move up and down relative to the positioning block 72. The positioning block 72 also constitutes a lower movement limit mechanism for the inner needle 3. When the inner needle 3 retracts under external force, the safety rebound device 4 and the indicator block 71 retract accordingly, exposing the puncture edge 21 of the outer needle 2 to puncture the abdominal wall. When the outer needle 2 punctures the peritoneum, the safety rebound device 4 rebounds, the inner needle 3 extends outward, and the protective blunt tip 31 extends to shield the puncture edge 21. At the same time, the indicator block 71 is pushed to its distal end by the safety rebound device 4 and impacts the positioning block 72, producing a sound to indicate that the inner needle 3 has rebounded into place.

[0027] The air intake mechanism 11 includes a Luer connector 11-1 and a rotary valve switch 11-2. The Luer connector 11-1 is connected to the inflation port of the external pneumoperitoneum machine. Opening the rotary valve switch 11-2 connects the gas channel 6 to the external pneumoperitoneum machine to inflate the abdominal cavity.

[0028] The inner needle 3 and the outer needle 2 are made of medical-grade stainless steel. To ensure the biosafety of the materials while maintaining the rigidity and strength of the inner needle 3 and the outer needle, the inner needle 3 and the outer needle 2 are typically made of medical-grade stainless steel.

[0029] In clinical use, the operator lifts the abdominal wall, places the protective blunt tip 31 of the inner needle 3 against the insertion position, and presses the anti-forward-rushing safety pneumoperitoneum needle 100 vertically downward until the inner needle 3 retracts, exposing the puncture edge 21. The operator continues to apply puncture force until the puncture edge 21 pierces the skin and the initial thread 51-1 adheres to the skin. Then, a rotational force is applied to the outer needle 2, causing it to rotate and enter the abdominal wall for further puncture. When the puncture edge 21 pierces the peritoneum, the rebound spring 41 is released, the inner needle 3 is pushed out, and the protective blunt tip 31 extends to shield the puncture edge 21. Simultaneously, due to the movement restriction between the threads, the forward-rushing distance of the anti-forward-rushing safety pneumoperitoneum needle 100 is limited to the pitch L range, effectively avoiding the clinical risks that may arise from an excessive forward-rushing distance. Connect the Luer connector 11-1 to the inflation port of the external pneumoperitoneum machine, and open the rotary valve switch 11-2 to connect the gas channel 6 to the external pneumoperitoneum machine, and inflate the abdominal cavity through the air outlet 32.

[0030] The present invention relates to a safety pneumoperitoneum needle for preventing forward thrust, comprising a handle 1, an outer needle 2, an inner needle 3, a safety rebound device 4, an anti-forward thrust device 5, and a gas channel 6. The distal end of the outer needle 2 is provided with the anti-forward-rushing device 5. The safety rebound device 4 retracts under the action of external force, and the inner needle 3 retracts accordingly. The puncture edge 21 of the outer needle 2 is exposed to puncture the tissue. After the puncture edge 21 punctures the tissue, the inner needle 3 rebounds under the rebound force of the safety rebound device 4, and the protective blunt tip 31 extends to shield and protect the puncture edge 21. At the same time, under the action of the anti-forward-rushing device 5, the forward-rushing distance of the anti-forward-rushing safety pneumoperitoneum needle 100 is limited to a safe distance. After the external air source is connected, the external gas enters the handle 1 through the air inlet mechanism 11 and flows through the inner needle 3, entering the body cavity from the air outlet 32 ​​at the distal end of the inner needle 3. The air inlet mechanism 11, the hollow channel of the handle 1, and the internal channel of the inner needle 3 together constitute the gas channel 6. Because the anti-forward-rushing device 5 is provided, the forward-rushing distance of the outer needle 2 of the anti-forward-rushing safety pneumoperitoneum needle 100 when it pierces the peritoneum can be reduced and limited to a safe range. This effectively controls the forward-rushing phenomenon of the outer needle 2 of the anti-forward-rushing safety pneumoperitoneum needle 100 at the moment of piercing the peritoneum, thereby effectively avoiding accidental damage to surrounding tissues or organs caused by excessive forward-rushing distance of the anti-forward-rushing safety pneumoperitoneum needle 100 due to inertia. Attached Figure Description

[0031] Figure 1 This is a structural schematic diagram of the anti-forward-jumping safety pneumoperitone needle of this utility model, which contains continuous self-tapping threads.

[0032] Figure 1-1 yes Figure 1Enlarged view of point A.

[0033] Figure 1-2 yes Figure 1 The main view.

[0034] Figure 1-3 yes Figure 1-2 BB cross-sectional view.

[0035] Figure 1-4 yes Figure 1-3 Enlarged view of point C.

[0036] Figure 1-5 yes Figure 1 Exploded view.

[0037] Figure 2 This is a structural schematic diagram of the anti-forward-rushing safety pneumoperitoneum needle of this utility model, which includes intermittent self-tapping threads.

[0038] Figure 2-1 yes Figure 2 Enlarged view of point D.

[0039] In the above figure:

[0040] 100 is the anti-forward-rushing safety pneumoperitoneum needle of this utility model.

[0041] 1 is the handle, 2 is the outer needle, 3 is the inner needle, 4 is the safety rebound device, 5 is the anti-forward-rushing device, 6 is the gas channel, 7 is the warning device, and 5-1 is the spiral anti-forward-rushing device.

[0042] 11 is the air intake mechanism, 21 is the piercing blade, 22 is the working channel, 31 is the protective blunt end, 32 is the air outlet, 33 is the positioning protrusion, 41 is the rebound spring, 51 is the self-tapping thread mechanism, 71 is the marking block, and 72 is the positioning block.

[0043] 11-1 is a Luer connector, 11-2 is a rotary valve switch, 51-1 is a starting thread, 51-2 is a continuous self-tapping thread, and 51-3 is an intermittent self-tapping thread.

[0044] L is the pitch. Detailed Implementation

[0045] Example 1: The anti-forward-jumping safety pneumoperitoneum needle of this utility model with a continuous self-tapping thread structure

[0046] refer to Figures 1 to 1-5 The anti-forward-rushing safety pneumoperitoneum needle of this embodiment includes a handle 1, an outer needle 2, an inner needle 3, a safety rebound device 4, an anti-forward-rushing device 5, and a gas channel 6.

[0047] refer to Figure 1-3The handle 1 is hollow and has an air intake mechanism 11 at its proximal end. The air intake mechanism 11 includes a Luer connector 11-1 and a rotary valve switch 11-2. The Luer connector 11-1 is connected to the inflation port of an external pneumoperitoneum machine. Opening the rotary valve switch 11-2 connects the gas channel 6 to the external pneumoperitoneum machine, allowing inflation of the abdominal cavity.

[0048] refer to Figure 1-1 The outer needle 2 has a puncture edge 21 at its distal end and is connected to the distal end of the handle 1 at its proximal end. To reduce puncture resistance, the puncture edge 21 is usually a double-edged puncture edge.

[0049] refer to Figure 1-3 and Figure 1-4 The distal end of the inner needle 3 is a protective blunt tip 31, and an air outlet 32 ​​is provided near the protective blunt tip 31; the inner needle 3 is movably disposed in the working channel 22 of the outer needle 2, and a positioning protrusion 33 is provided at the proximal end.

[0050] The inner needle 3 and the outer needle 2 are made of medical-grade stainless steel. To ensure the biosafety of the materials while maintaining the rigidity and strength of the inner needle 3 and the outer needle, the inner needle 3 and the outer needle 2 are typically made of medical-grade stainless steel.

[0051] The anti-forward-rushing device 5 is provided at the distal end of the outer needle 2.

[0052] Current methods of pneumoperitoneum needle insertion involve the use of inner and outer needles. During puncture, the outer needle's cutting edge is exposed, and after piercing the peritoneum, the inner needle rebounds to shield the outer needle's cutting edge, completing the abdominal wall puncture. In this method, the outer needle 2 punctures in a straight line. Therefore, at the moment the outer needle 2 pierces the peritoneum, the sudden disappearance of the tissue barrier at the tip of the outer needle 2 causes a sudden and significant reduction in resistance, resulting in an instantaneous acceleration of the pneumoperitoneum needle's linear motion. Due to inertia, the outer needle 2 will experience a significant forward thrust at the moment of puncture. If this thrust is too large, it can easily cause accidental damage to the tissues or organs ahead. From a mechanical perspective, the forward thrust distance caused by inertia is directly related to the puncture force, puncture speed, and reaction time after stopping the applied puncture force. Generally, the greater the puncture force, the faster the speed, and the slower the reaction time after stopping the applied puncture force, the longer the forward thrust distance due to sudden acceleration and inertia.

[0053] Therefore, the anti-protrusion device 5 can reduce the protrusion distance of the outer needle 2 of the anti-protrusion safety pneumoperitoneum needle 100 when it pierces the peritoneum by limiting the distance, controlling the puncture force, reducing the puncture speed, and adjusting the movement mode, thereby limiting it to a safe range. This effectively controls the protrusion phenomenon of the outer needle 2 of the anti-protrusion safety pneumoperitoneum needle 100 at the moment of piercing the peritoneum, thereby effectively avoiding accidental damage to surrounding tissues or organs caused by excessive protrusion distance of the anti-protrusion safety pneumoperitoneum needle 100 due to inertia.

[0054] In this embodiment, the anti-forward-rushing device 5 is a spiral-type anti-forward-rushing device 5-1, which controls the forward movement of the anti-forward-rushing safety pneumoperitoneum needle 100 by combining two control methods: adjusting the movement mode and limiting the position. The spiral structure can convert the linear forward-pushing force applied to the outer needle 2 into rotational torque, thereby changing the movement mode of the outer needle 2 from linear motion to rotational motion. Even if the peritoneal barrier at the anterior end suddenly disappears, causing a significant reduction in movement resistance, there will be no sudden and large forward-rushing. In practical applications, those skilled in the art can design different anti-forward-rushing technical solutions as needed. The applicant will not provide examples here, but all of them are within the scope of protection of this application.

[0055] refer to Figure 1 and Figure 1-1 In this embodiment, the spiral anti-forward-rushing device 5-1 is a self-tapping thread mechanism 51 disposed at the distal end of the outer needle 3. The self-tapping thread mechanism 51 is disposed at the distal end of the outer needle 2 through welding, integral precision machining, or other methods. This self-tapping thread structure transforms the traditional linear motion of the outer needle 2 into a rotational motion. During puncture, it moves from the abdominal wall into the body cavity through rotation. Because it is spiral-propelled, the movement speed is easy to control, and acceleration during linear motion is less likely to occur. Especially at the moment of puncture, even if the sudden disappearance of the barrier leads to a significant reduction in movement resistance, the rotational force applied to the outer needle 2 prevents an instantaneous acceleration of the forward linear puncture motion. Furthermore, due to the unique spiral structure of the thread, the concave and convex structure between the threads can also serve as a limiting mechanism, achieving a safe distance.

[0056] refer to Figure 1-1The starting thread 51-1 of the self-tapping thread mechanism 51 is attached to the proximal end of the puncture cutting edge 21. To ensure a good puncture effect and reduce the initial resistance of the spiral motion, the starting position of the starting thread 51-1 is attached to the proximal end of the puncture cutting edge 21. Therefore, after the puncture cutting edge 21 enters the abdominal wall, it performs a rotational motion, which not only ensures low movement resistance when puncturing the skin, but also allows for a smooth switch from linear motion to spiral motion. Moreover, the attached design makes the switching of motion mode smoother.

[0057] refer to Figure 1-1 The self-tapping thread mechanism 51 has a concave-convex structure between the threads, which can form a good limiting structure. At the moment of piercing the peritoneum, the forward movement of the outer needle 2 can be restricted before the next thread. Therefore, the pitch L constitutes the forward movement safety distance of the forward movement safety pneumoperitoneum needle 100.

[0058] The pitch L is between 0.2 mm and 10 mm. Normal peritoneum thickness is typically 0.1–0.2 mm, while the thickness of diseased peritoneum is usually several millimeters, less than 10 mm. Therefore, to accommodate different peritoneal thicknesses, the pitch L is typically between 0.2 mm and 10 mm.

[0059] In this embodiment, the self-tapping thread mechanism 51 is a continuous self-tapping thread 51-2. This continuous thread structure can achieve full-circumference limiting and is easier to process.

[0060] refer to Figure 1-3 The safety rebound device 4 is a rebound spring 41. The rebound spring 41 can be directly installed inside the handle 1, with its distal end connected to the proximal end of the inner needle 3, and its proximal end abutting against the inner wall of the proximal end of the handle 1. It uses its own elasticity to compress and release, without the need for additional mechanisms, and the structure is very simple.

[0061] The anti-puffing safety pneumoperitoneum needle 100 also includes a warning device 7. The warning device 7 can provide indication or warning of the puncture status of the anti-puffing safety pneumoperitoneum needle 100.

[0062] The warning device 7 provides prompts or warnings regarding the puncture process of the anti-pneumoperitoneal needle 100 through color, and / or sound, and / or movement. The warning device 7 can provide prompts or warnings regarding the puncture process of the anti-pneumoperitoneal needle 100 through one or more of the above methods. In this embodiment, the warning device 7 is a combination of color and sound.

[0063] refer to Figure 1-3 and Figure 1-5The warning device 7 includes an indicator block 71 and a positioning block 72. The indicator block 71 is typically a bright color such as green or red so that its position can be clearly observed during operation to determine the puncture status of the anti-forward-rushing safety pneumoperitoneum needle 100. Simultaneously, the indicator block 71 resets and strikes the positioning block 72 to emit an audible alert.

[0064] During assembly, first, the outer needle 2 is fixed to the distal end of the handle 1. Then, the inner needle 3 is inserted into the handle 1 after passing through the positioning block 72, and the distal end of the inner needle 3 is inserted into the working channel 22 of the outer needle 2. The positioning protrusion 33 is embedded in the positioning block 72, so that the inner needle 2 will not slip out of the working channel 22 of the outer needle 2. Then, the marking block 71 and the rebound spring 41 are sequentially inserted into the handle 1, and then the air intake mechanism 11 is installed and fixed at the proximal end of the handle.

[0065] In clinical use, the operator lifts the abdominal wall, places the protective blunt tip 31 of the inner needle 3 against the insertion position, and presses the anti-forward-rushing safety pneumoperitoneum needle 100 vertically downward. The rebound spring 41 is compressed, the inner needle 3 retracts, and the puncture edge 21 is exposed. The puncture force is continued to be applied until the puncture edge 21 pierces the skin until the initial thread 51-1 adheres to the skin. Then, a rotational force is applied to the outer needle 2, causing the outer needle 2 to rotate and enter the abdominal wall for further puncture. When the puncture edge 21 pierces the peritoneum, the rebound spring 41 is released, the inner needle 3 is pushed out, and the protective blunt tip 31 extends to shield and protect the puncture edge 21. At the same time, due to the movement restriction between the threads, the forward-rushing distance of the anti-forward-rushing safety pneumoperitoneum needle 100 is limited to the pitch L range, effectively avoiding the clinical risks that may be caused by the excessive forward-rushing distance of the anti-forward-rushing safety pneumoperitoneum needle 100. Then, connect the Luer connector 11-1 to the inflation port of the external pneumoperitoneum machine, and open the rotary valve switch 11-2 to connect the gas channel 6 to the external pneumoperitoneum machine, inflating the abdominal cavity through the air outlet 32. The gas enters the handle 1 through the air inlet mechanism 11, flows through the inner needle 3, and enters the body cavity through the air outlet 32 ​​at the distal end of the inner needle 3. The air inlet mechanism 11, the hollow channel of the handle 1, and the internal channel of the inner needle 3 together constitute the gas channel 6.

[0066] In this embodiment, the anti-forward-rushing device 5 can reduce the forward-rushing distance of the outer needle 2 of the anti-forward-rushing safety pneumoperitoneum needle 100 when it pierces the peritoneum, thus limiting it to a safe range. This effectively controls the forward-rushing phenomenon of the outer needle 2 of the anti-forward-rushing safety pneumoperitoneum needle 100 at the moment of piercing the peritoneum, thereby effectively avoiding accidental damage to surrounding tissues or organs caused by excessive forward-rushing distance of the anti-forward-rushing safety pneumoperitoneum needle 100 due to inertia.

[0067] Example 2: The anti-forward-rushing safety pneumoperitoneum needle of this utility model with a warning mechanism

[0068] refer to Figure 2 and Figure 2-1 The difference between this embodiment and embodiment 1 is that in this embodiment, the anti-forward-rushing device 5 is an intermittent self-tapping thread 51-3.

[0069] refer to Figure 2 and Figure 2-1 The intermittent self-tapping thread 51-3 is set at the far end of the outer pin 2 by means of welding, integral precision machining or other methods.

[0070] In clinical use, the operator lifts the abdominal wall, places the protective blunt tip 31 of the inner needle 3 against the insertion position, and presses the anti-forward-rushing safety pneumoperitoneum needle 100 vertically downward. The rebound spring 41 is compressed, the inner needle 3 retracts, and the puncture edge 21 is exposed. The puncture force is continued to be applied until the puncture edge 21 pierces the skin until the initial thread 51-1 adheres to the skin. Then, a rotational force is applied to the outer needle 2, causing the outer needle 2 to rotate and enter the abdominal wall for further puncture. When the puncture edge 21 pierces the peritoneum, the rebound spring 41 is released, the inner needle 3 is pushed out, and the protective blunt tip 31 extends to shield and protect the puncture edge 21. At the same time, due to the movement restriction between the threads, the forward-rushing distance of the anti-forward-rushing safety pneumoperitoneum needle 100 is limited to the pitch L range, effectively avoiding the clinical risks that may be caused by the excessive forward-rushing distance of the anti-forward-rushing safety pneumoperitoneum needle 100. Then, connect the Luer connector 11-1 to the inflation port of the external pneumoperitoneum machine, and open the rotary valve switch 11-2 to connect the gas channel 6 to the external pneumoperitoneum machine, inflating the abdominal cavity through the air outlet 32. The gas enters the handle 1 through the air inlet mechanism 11, flows through the inner needle 3, and enters the body cavity through the air outlet 32 ​​at the distal end of the inner needle 3. The air inlet mechanism 11, the hollow channel of the handle 1, and the internal channel of the inner needle 3 together constitute the gas channel 6. During rotation, due to the presence of gaps, it has good chip removal capability, and because of the small contact area, the friction is lower and the screwing torque is lower.

[0071] In this embodiment, an intermittent thread structure is adopted, which is less likely to get stuck, and the movement resistance is lower than that of a continuous thread structure, making the process of entering the abdominal wall easier.

[0072] It should be noted that the structures disclosed and described herein can be replaced by other structures with the same effect, and the embodiments described herein are not the only structures for implementing this utility model. Although preferred embodiments of this utility model have been described and illustrated herein, those skilled in the art will understand that these embodiments are merely illustrative, and those skilled in the art can make numerous variations, improvements, and substitutions without departing from this utility model. Therefore, the scope of protection of this utility model should be defined in accordance with the spirit and scope of the appended claims.

Claims

1. A forward-leaning safety pneumoperitoneum needle, characterized in that: The anti-forward-rushing safety pneumoperitoneum needle (100) includes a handle (1), an outer needle (2), an inner needle (3), a safety rebound device (4), an anti-forward-rushing device (5), and a gas channel (6); A. The handle (1) is hollow and is equipped with an air intake mechanism (11); B. The distal end of the external needle (2) is provided with a puncture blade (21), and the proximal end is connected to the handle (1); C. The distal end of the inner needle (3) is a protective blunt tip (31), and an air outlet (32) is provided near the protective blunt tip (31); the inner needle (3) is movably disposed in the working channel (22) of the outer needle (2), and its proximal end is connected to the safety rebound device (4); D. The distal end of the outer needle (2) is provided with the anti-forward-rushing device (5); E. The safety rebound device (4) retracts under the action of external force, the inner needle (3) retracts accordingly, and the puncture edge (21) of the outer needle (2) is exposed to puncture the tissue. When the puncture edge (21) punctures the tissue, the inner needle (3) rebounds under the action of the rebound force of the safety rebound device (4), and the protective blunt head (31) extends out to shield the puncture edge (21). At the same time, under the action of the anti-forward-rushing device (5), the forward-rushing distance of the anti-forward-rushing safety pneumoperitoneum needle (100) is limited to a safe distance. After the external air source is connected, the external gas enters the handle (1) through the air inlet mechanism (11) and flows through the inner needle (3) to enter the body cavity from the air outlet (32) at the distal end of the inner needle (3). The air inlet mechanism (11), the hollow channel of the handle (1), and the internal channel of the inner needle (3) together constitute the gas channel (6).

2. The anti-forward-rushing safety pneumoperitoneum needle according to claim 1, characterized in that: The anti-forward-rushing device (5) is a spiral-type anti-forward-rushing device (5-1).

3. The anti-forward-rushing safety pneumoperitoneum needle according to claim 2, characterized in that: The spiral anti-forward-rushing device (5-1) is a self-tapping thread mechanism (51) located at the far end of the outer pin (2).

4. The anti-forward-rushing safety pneumoperitoneum needle according to claim 3, characterized in that: The starting thread (51-1) of the self-tapping thread mechanism (51) is attached to the proximal end of the piercing edge (21).

5. The anti-forward-rushing safety pneumoperitoneum needle according to claim 3, characterized in that: The self-tapping thread mechanism (51) limits the forward thrust safety distance of the anti-forward thrust safety pneumoperitone needle (100) to the thread pitch L.

6. The anti-forward-rushing safety pneumoperitoneum needle according to claim 5, characterized in that: The pitch L is between 0.2 mm and 10 mm.

7. The anti-forward-rushing safety pneumoperitoneum needle according to claim 3, characterized in that: The self-tapping thread mechanism (51) is a continuous self-tapping thread (51-2) or an intermittent self-tapping thread (51-3).

8. The anti-forward-rushing safety pneumoperitoneum needle according to claim 1, characterized in that: The safety rebound device (4) is a rebound spring (41).

9. The anti-forward-rushing safety pneumoperitoneum needle according to claim 8, characterized in that: The spring (41) is disposed on the handle (1). The distal end of the spring (41) is connected to the inner needle (3). The proximal end of the spring (41) abuts against the inner wall of the handle (1). Under the action of external force, the spring (41) is compressed, the inner needle (3) retracts, and the puncture edge (21) of the outer needle (2) is exposed to puncture the tissue. When the puncture edge (21) punctures the tissue, the compressed spring (41) releases and rebounds, and the protective blunt head (31) extends to form a shielding protection for the puncture edge (21).

10. The anti-forward-rushing safety pneumoperitoneum needle according to claim 1, characterized in that: The anti-forward-rushing safety pneumoperitoneum needle (100) also includes a warning device (7).

11. The anti-forward-rushing safety pneumoperitoneum needle according to claim 10, characterized in that: The warning device (7) provides prompts or warnings about the puncture process of the anti-forward-rushing safety pneumoperitoneum needle (100) through color, and / or sound, and / or movement.

12. The anti-forward-rushing safety pneumoperitoneum needle according to claim 11, characterized in that: The warning device (7) is an indicator block (71), which is connected to the safety rebound device (4). The safety rebound device (4) moves synchronously with the indicator block (71). The movement of the indicator block (71) provides prompts or warnings for the puncture process of the anti-forward-rushing safety pneumoperitoneum needle (100).

13. The anti-forward-rushing safety pneumoperitoneum needle according to claim 12, characterized in that: The warning device (7) also includes a positioning block (72), which is located at the far end of the marking block (71). After the marking block (71) is reset to the far end, it makes an impact sound with the positioning block (72) to provide a warning.

14. The anti-forward-rushing safety pneumoperitoneum needle according to claim 1, characterized in that: The intake mechanism (11) includes a Luer connector (11-1) and a rotary valve switch (11-2).

15. The anti-forward-rushing safety pneumoperitoneum needle according to claim 1, characterized in that: The inner needle (3) and the outer needle (2) are made of medical stainless steel.

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