Tympanic ventilation tube and delivery device

Abstract

This utility model relates to the field of medical device technology, specifically to tympanic membrane ventilation tubes and delivery devices. It is suitable for tympanic membrane ventilation tube placement. The tympanic membrane ventilation tube includes an inner claw, a tube body, and an outer claw. The tube body is a hollow tube, with both ends fixedly connected to one end of the inner claw and the other end of the outer claw, respectively. The other end of the inner claw and the outer claw is a free end; the free end is made of shape memory alloy, and is straight at 0°C and bent at 20-40°C. The bent state of the inner and outer claws achieves multi-point and bidirectional fixation. This application also provides a novel delivery device, used in conjunction with the tympanic membrane ventilation tube to form a tympanic membrane ventilation tube placement system. Tympanic membrane ventilation tube placement no longer requires a tympanic membrane incision, integrating the cutting, insertion, and placement processes, effectively controlling the puncture diameter and depth, reducing accidental injury, improving surgical safety, simplifying surgical procedures, and shortening surgical time.

Description

Technical Field

[0001] This utility model relates to the field of medical equipment technology, specifically to tympanic membrane ventilation tubes and delivery devices. It is suitable for tympanic membrane ventilation tube placement. Background Technology

[0002] Secretory otitis media (OME) is a common ear condition, generally treated with medication. When medication proves ineffective, tympanostomy tube insertion is often performed. Current tympanostomy tube insertion procedures typically involve a manual incision in the tympanic membrane. Other equipment is used to aspirate and remove pus from the ear, and then various surgical instruments are used to place the tympanic ventilation tube through the incision. Because the ear canal is relatively small, the size of the incision largely depends on the surgeon's feel and experience, requiring a high level of skill and easily resulting in an incision that is either too large or too small. If the incision is too large, the tympanic ventilation tube may dislodge or fall into the tympanic cavity; if the incision is too small, insertion becomes difficult and requires re-incision. Furthermore, the tympanic membrane contains various nerves, and repeated procedures are extremely painful for patients, especially young children, requiring general anesthesia, which can cause irreversible damage and is also very expensive.

[0003] Therefore, we aim to change the status quo of tympanic tube insertion and develop new technologies for the treatment of secretory otitis media, including the selection and structural design of the insertion device, tympanic ventilation tube materials, etc. The new procedure is simple to operate, has a short insertion time, and can be performed in an outpatient setting under local anesthesia. Utility Model Content

[0004] The purpose of this invention is to address the problems existing in the prior art by providing a tympanic membrane ventilation tube and delivery device that is safe to use, causes minimal trauma during insertion, and has good subsequent recovery effects.

[0005] The tympanic membrane ventilation tube includes an inner claw, a tube body, and an outer claw. The tube body is a hollow tube, and its two ends are fixedly connected to one end of the inner claw and one end of the outer claw, respectively. The other end of the inner claw and the outer claw is a free end. The free end is made of shape memory alloy. The free end is straight at 0°C and bent at 20 to 40°C. The tube body is made of stainless steel, and the inner claw and the outer claw are made of TiNi shape memory alloy. The inner claw, tube body, and outer claw are wrapped with silicone or tetrafluoroethylene as a coating layer.

[0006] The tube body has 2-4 inner or outer claws, with gaps between adjacent inner or outer claws, and the inner or outer claws are evenly distributed along the circumference of the outer wall of the tube body.

[0007] The free end is straight at 0°C, forming a straight tube with the tube body; the free end is bent at 20 to 40°C, forming a dumbbell shape with the tube body; the tube body has a hollow channel, which can be a tubular cavity, a trumpet cavity, or an arc cavity; the inner diameter of the tubular cavity remains constant along the axial direction of the hollow channel; the inner diameter of the trumpet cavity's inner claw end is smaller than the inner diameter of its outer claw end along the axial direction of the hollow channel; the inner diameter of the arc cavity's inner claw end is smaller than the inner diameter of its outer claw end along the axial direction of the hollow channel and is radially raised in the middle.

[0008] A delivery device includes a puncture needle, a release tube, an outer tube, a connecting wire, an outer tube fixing seat, a connecting wire fixing seat, a button, a safety button spring, a safety button, a release spring, a left housing, and a right housing;

[0009] One end of the outer tube is provided with a release tube, and the other end of the outer tube is fixedly connected to an outer tube fixing seat. The outer tube fixing seat has a hollow cavity, which, together with the outer tube cavity, forms a sliding channel. A puncture needle and a connecting wire are placed within the sliding channel. The puncture needle is fitted into the release tube and has a pointed end and a connecting end. The pointed end extends out of the release tube, and the connecting end is fixedly connected to one end of the connecting wire to form a sliding assembly. A tympanic membrane ventilation tube is placed in the gap between the puncture needle and the release tube. The other end of the connecting wire extends out of the sliding channel and connects to the connecting wire fixing seat. The outer tube fixing seat and the connecting wire fixing seat are fastened together by the left and right shells. The outer tube fixing seat is fixedly installed at the head of the shell. A sliding gap is reserved between the outer tube fixing seat and the connecting wire fixing seat, allowing the connecting wire fixing seat to slide within the shell. The connecting wire fixing seat has a release spring at its rear end. The connecting wire fixing seat is connected to the button via a rack and pinion assembly. The button pressing part extends out of the housing. The button has a locking groove. The safety button consists of a pressing part and a locking pin. The locking pin of the safety button is inserted into the locking groove of the button. The safety button spring pushes the locking pin into the locking groove to lock. Pressing the safety button releases the locking pin from the locking groove to unlock. The release spring ejects the connecting wire fixing seat and the connecting wire along the sliding gap. The connecting wire pushes the puncture needle and the tympanic ventilation tube out of the release tube to complete the installation of the tympanic ventilation tube. Pressing the button drives the connecting wire fixing seat and the connecting wire to move in the opposite direction along the sliding gap. The connecting wire drives the puncture needle to retract into the release tube, causing the tympanic ventilation tube to detach from the release tube.

[0010] The puncture needle and the release tube are fitted with a clearance. The connection end between the release tube and the puncture needle is claw-shaped, with the claw tip along the release tube. The outer wall of the release tube is provided with a marking point, which is laser-etched or fluorescently sprayed. The tip of the puncture needle extends out of the release tube by 0.5-1.0 mm. The tip angle of the puncture needle is 30-35°, 25-30°, or 20-25°. When the tip angle is less than 25°, a stepped needle can be used for a gradual transition.

[0011] The left and right shells are assembled to form a hand handle. The outer tube of the conveyor is divided into a straight section and a curved section, which are connected to form an integrated structure.

[0012] The beneficial effects of this utility model are as follows:

[0013] This application presents a novel and innovative structure that revolutionizes traditional tympanic membrane placement. Utilizing a shape-memory alloy, the inner and outer claws achieve free-end bending at room temperature. This bending motion allows for multi-point and bidirectional fixation, increasing the support area and stability, ensuring secure fixation of the tympanic membrane at multiple points. Furthermore, the bidirectional fixation eliminates the risk of the membrane dislodging out of the ear canal or falling into the tympanic cavity. This application also provides a novel delivery device that, when used with a tympanic membrane ventilation tube, forms a tympanic membrane ventilation tube placement system. This eliminates the need for a tympanic membrane incision, integrating the cutting, insertion, and placement processes. This effectively controls the size and depth of the puncture hole, reducing the risk of injury, improving surgical safety, simplifying the procedure, and shortening the operation time. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the tympanic membrane ventilation tube insertion system;

[0015] Figure 2 Top view of the tympanic membrane ventilation tube placement system;

[0016] Figure 3 Side view of the tympanic membrane ventilation tube placement system;

[0017] Figure 4 A cross-sectional view of the central puncture type delivery device structure;

[0018] Figure 5 Enlarged view of a central puncture-type delivery device for inserting a tympanic membrane ventilation tube;

[0019] Figure 6 A magnified view of a centrally inserted puncture-type delivery device ejecting a tympanic membrane ventilation tube;

[0020] Figure 7 Enlarged view of a portion of the tympanic membrane after the tympanic membrane ventilation tube is inserted.

[0021] Figure 8 This is a schematic diagram of a two-claw tympanic membrane ventilation tube.

[0022] Figure 9 A schematic diagram of a three-pronged tympanic membrane ventilation tube;

[0023] Figure 10 A schematic diagram of a four-claw tympanic membrane ventilation tube;

[0024] Figure 11This is a schematic diagram of the hollow channel tubular cavity structure within the tube body;

[0025] Figure 12 This is a schematic diagram of the hollow channel horn cavity structure in the tube;

[0026] Figure 13 This is a schematic diagram of the circular arc cavity structure of the hollow channel in the tube;

[0027] Figure 14 This is a schematic diagram of a four-claw-type release tube structure;

[0028] Figure 15 Side view of the claw-type release tube;

[0029] Figure 16 This is a schematic diagram of the puncture needle structure;

[0030] Figure 17 A schematic diagram of the gradual transition of the step-like needle in a puncture needle;

[0031] Figure 18 This is the side view of the button;

[0032] Figure 19 This is a schematic diagram of the safety button structure;

[0033] Figure 20 This is a schematic diagram of the outer tube fixing seat structure;

[0034] Figure 21 This is a schematic diagram of the connecting wire fixing seat structure;

[0035] In the diagram: 1. Tympanic membrane insertion device, 101. Puncture needle, 102. Release tube, 103. Outer tube, 104. Connecting wire, 105. Outer tube fixing seat, 106. Connecting wire fixing seat, 107. Button, 108. Safety button spring, 109. Safety button, 110. Release spring, 111. Left housing, 111. Right housing, 112. Tympanic membrane ventilation tube 2, 201. Inner claw, 202. Tube body, 203. Outer claw, 204. Arc-shaped edge. Detailed Implementation

[0036] The tympanic membrane ventilation tube includes an inner claw 201, a tube body 202, and an outer claw 203. The tube body 202 is a hollow tube, with both ends fixedly connected to one end of the inner claw 201 and the outer claw 203, respectively. The other ends of the inner claw 201 and the outer claw 203 are free ends. The free ends are made of shape memory alloy, which is straight at 0°C and bent at 20-40°C. Existing tympanic membrane ventilation tubes are inserted through an incision in the tympanic membrane. The placement and fixation of the tube body in existing technologies is a technical challenge. If the incision is too large, the tympanic membrane ventilation tube is prone to dislodgement or falling into the tympanic cavity; if the incision is too small, placement becomes difficult and requires re-incision, increasing the complexity and risk of the procedure. Even after placement, the risk of dislodgement or falling into the tympanic cavity remains due to patient movement, causing significant inconvenience for both doctors and patients during surgery and in their subsequent lives. This application presents a completely innovative structure that changes the existing traditional placement structure. It utilizes a shape memory alloy to achieve bending of the free ends of the inner and outer claws at room temperature. The bending state of the inner and outer claws achieves multi-point and bidirectional fixation, which not only increases the support area and support firmness, ensuring that the tympanic membrane is firmly fixed at multiple points, but also solves the problem of bidirectional fixation, completely eliminating the risk of the eardrum dislodging out of the ear canal or falling into the tympanic cavity.

[0037] Furthermore, the tube body 202 is made of stainless steel, while the inner claw 201 and outer claw 203 are made of TiNi shape memory alloy. The inner claw 201, tube body 202, and outer claw 203 are coated with silicone or PTFE as a protective layer. The tube body and the inner and outer claws are processed from different materials, effectively controlling the cost of using the tympanic membrane ventilation tube. In addition, the stainless steel tube body ensures the dimensional stability of the core support component, while the TiNi shape memory alloy inner and outer claws allow for free-end bending, achieving deformation fixation through material temperature changes. In particular, different materials are used for different tubes and components to meet diverse application requirements. The silicone or PTFE coating completely encapsulates the metal material, reducing the metallic foreign body sensation after the tympanic membrane ventilation tube is inserted, improving comfort during insertion. The silicone or PTFE coating uses a conventional spraying process, enabling rapid construction of the tympanic membrane ventilation tube coating.

[0038] Furthermore, the tube body 202 has 2-4 inner claws 201 or outer claws 203, with gaps between adjacent inner claws 201 or outer claws 203. The inner claws 201 or outer claws 203 are evenly distributed along the circumference of the outer wall of the tube body 202. 2-4 inner claws 201 or outer claws 203 meet the needs of different tympanic membrane patients. When the tympanic membrane is thin or damaged, more groups can be selected to improve local fixation performance, preventing it from dislodging outwards from the ear canal or falling inwards into the tympanic cavity, avoiding the need for secondary fixation due to insecure fixation. When the tympanic membrane structure is intact, fewer groups can be selected to reduce foreign body sensation and improve comfort. Different numbers of groups can also be flexibly selected according to age and tympanic membrane thickness. The gaps between adjacent inner claws 201 or outer claws 203 provide better bending space for the inner and outer claws, effectively ensuring that the shape memory alloy inner and outer claws bend and deform appropriately.

[0039] Furthermore, the free ends of the inner claw 201 and the outer claw 203 are oriented in opposite directions; the free ends of the inner claw 201 and the outer claw 203 are provided with arc-shaped edges 204. The opposite orientation of the free ends allows the inner and outer claws to be fixed in both directions, while the arc-shaped edges on the ends effectively prevent scratching of the inner ear tissue during the bending and deformation of the free ends.

[0040] Furthermore, the inner claw 201 and outer claw 203 are staggered; the length of the outer claw 203 is greater than or equal to the length of the inner claw 201. The staggered arrangement of the inner and outer claws, after insertion, causes the tube to bend and unfold into multiple layers of petals, avoiding concentrated stress in any one area and reducing pain and foreign body sensation. The length of the outer claw 203 is greater than or equal to the length of the inner claw 201, strengthening the support strength of the outer claw outside the tympanic membrane.

[0041] Furthermore, the free end is straight at 0°C, forming a straight tube with the tube body 202; the free end is bent at temperatures between 20 and 40°C, forming a dumbbell shape with the tube body 202; the tube body 202 has a hollow channel, which can be a tubular cavity, a trumpet cavity, or an arc-shaped cavity. The tubular cavity has a constant inner diameter along the axial direction of the hollow channel; the trumpet cavity has a smaller inner diameter at the inner claw end than the outer claw end along the axial direction of the hollow channel; the arc-shaped cavity has a smaller inner diameter at the inner claw end than the outer claw end and a radial bulge in the middle. The dumbbell-shaped structure improves the drainage efficiency of the tubular cavity hollow channel. The inner diameter of the inner claw of the horn cavity is 0.05-0.2 mm smaller than that of the outer claw. According to Bernoulli's principle of fluid flow, when the effusion in the ear flows from the narrow cross-section of the horn cavity into the gradually widening horn opening, the increased cross-sectional area leads to a decrease in flow velocity, allowing the effusion to drain more smoothly. The connecting end of the outer claw of the gradually widening horn opening is lower than the connecting end of the inner claw, facilitating effusion drainage and improving drainage efficiency. After the effusion in the arc-shaped cavity flows out along the radial bulge, it flows rapidly downwards along the radial bulge, effectively preventing backflow; at the same time, the radial bulge forms a barrier, effectively reducing the entry of dust and foreign objects into the tympanic membrane through the arc-shaped cavity.

[0042] A tympanic membrane ventilation tube delivery device includes a puncture needle 101, a release tube 102, an outer tube 103, a connecting wire 104, an outer tube fixing seat 105, a connecting wire fixing seat 106, a button 107, a safety button spring 108, a safety button 109, a release spring 110, a left housing 111, and a right housing 112. One end of the outer tube 103 is provided with the release tube 102, and the other end of the outer tube 103 is fixedly connected to the outer tube fixing seat 105. The outer tube fixing seat 105 has a hollow cavity, and the hollow cavity of the outer tube fixing seat 105 and the outer tube 103 cavity form a sliding channel. The puncture needle 101 and the connecting wire 104 are placed in the sliding channel. The puncture needle 101 is clamped in the release tube 102. The puncture needle 101 has a pointed end and a connecting end. The end of the release tube 102 extends out, and the connecting end is fixedly connected to one end of the connecting wire 104 to form a sliding assembly. The tympanic membrane ventilation tube 2 is placed in the gap between the puncture needle 101 and the release tube 102. The other end of the connecting wire 104 passes through the sliding channel and is connected to the connecting wire fixing seat 106. The outer tube fixing seat 105 and the connecting wire fixing seat 106 are fastened and locked by the left shell 111 and the right shell 112. The outer tube fixing seat 105 is fixedly installed on the end of the shell, and a sliding gap is reserved between the outer tube fixing seat 105 and the connecting wire fixing seat 106. The connecting thread fixing seat 106 slides along the sliding gap inside the housing. A release spring 110 is provided at the rear end of the connecting thread fixing seat 106. The connecting thread fixing seat 106 is connected to the button 107 via a rack and pinion assembly. The pressing part of the button 107 extends out of the housing. The button 107 has a locking groove. The safety button 109 consists of a pressing part and a locking pin. The locking pin of the safety button 109 inserts into the locking groove of the button 107. The safety button spring 108 of the safety button 109 pushes the locking pin into the locking groove to achieve locking. Pressing the safety button... The safety button 109 unlocks the device by disengaging the locking pin from the locking slot. The release spring 110 ejects the connecting wire fixing seat 106 and the connecting wire 104 along the sliding gap. The connecting wire 104 pushes the puncture needle 101 and the tympanic membrane ventilation tube 2 out of the release tube 102, completing the installation of the tympanic membrane ventilation tube. By pressing the button 107, the connecting wire fixing seat 106 and the connecting wire 104 move in the opposite direction along the sliding gap. The connecting wire 104 drives the puncture needle 101 to retract into the release tube 102, causing the tympanic membrane ventilation tube 2 to detach from the release tube 102.

[0043] This application provides a novel central puncture delivery device, used in conjunction with a tympanic membrane ventilation tube to form a tympanic membrane ventilation tube placement system. Tympanic membrane ventilation tube placement eliminates the need for a tympanic membrane incision, integrating the cutting, insertion, and placement processes. A button is moved to set the puncture movement size, which is locked by a safety button. The delivery tube is inserted into the ear canal close to the tympanic membrane through the outer tube. Unlocking the safety button triggers a spring-loaded release, puncturing the tympanic membrane and simultaneously pushing the tympanic membrane ventilation tube into place. Moving the button again retracts the puncture needle, detaching it from the tympanic membrane ventilation tube, and the delivery device is removed from the ear canal. This achieves cutting, insertion, and placement in one step. Furthermore, the tympanic membrane incision and the outer diameter of the tympanic membrane ventilation tube are uniform, preventing incisions that are too large or too small. The device can be cleaned, disinfected, and reused repeatedly. The tympanic membrane ventilation tube can be prefabricated in different sizes and with different hollow channel diameters, allowing for controlled installation by changing the size of the delivery tube and the outer tube. Prefabricated sizes allow for adjustments to suit different patients.

[0044] Furthermore, the puncture needle 101 and the release tube 102 are fitted with a clearance, and the connection end between the release tube 102 and the puncture needle 101 is claw-shaped, with the claw tip along the release tube 102. The outer wall of the release tube 102 is provided with marking points, which are laser-etched or fluorescently coated. These marking points are used for puncture positioning and subsequent re-examination to accurately identify the placement position. The tip of the puncture needle 101 extends out of the release tube 102 by 0.5-1.0 mm. The tip angle of the puncture needle 101 is 30-35°, 25-30°, or 20-25°. When the tip angle is less than 25°, a step-type needle can be used for a gradual transition. A 30-35° puncture effect is weaker and suitable for thinner or damaged tympanic membranes; a 20-25° puncture effect provides a sharp needle tip and is suitable for thicker tympanic membranes or stubborn cerumen punctures; a 25-30° puncture effect is moderate and suitable for most common patients. The marking points are determined by laser etching combined with an ear canal endoscope to observe the puncture location and catheter placement. Fluorescent marking points can also be added for subsequent checks to ensure the tympanic membrane ventilation tube has not dislodged and that the placement is accurate.

[0045] The left housing 111 and the right housing 112 are assembled to form a handheld handle. The conveyor 1 is a handheld conveyor. The outer tube 103 of the conveyor 1 is divided into a straight section and a curved section. The straight section and the curved section are connected to form an integral structure. The curved section is used to change the bending angle of the outer tube 103. The curved section can improve the observation and operation space of the handheld conveyor.

[0046] A sliding gap is provided between the outer tube retainer and the connecting wire retainer, allowing for precise control of the puncture depth. The outer tube retainer also serves as a limit stop to prevent accidental over-insertion and assists in positioning the puncture needle tip. The handheld end is equipped with a button and a safety button to prevent accidental activation of the release mechanism; the handle structure is ergonomic and can be used by either left- or right-handed users.

Claims

1. A tympanic membrane ventilation tube, characterized in that... It includes an inner claw (201), a tube body (202), and an outer claw (203). The tube body (202) is a hollow tube. Both ends of the tube body (202) are fixedly connected to one end of the inner claw (201) and the outer claw (203), respectively. The other end of the inner claw (201) and the outer claw (203) is a free end. The free end is made of shape memory alloy. The free end is straight at 0°C and bent at 20 to 40°C. The tube body (202) is made of stainless steel, and the inner claw (201) and the outer claw (203) are made of TiNi shape memory alloy. The inner claw (201), the tube body (202), and the outer claw (203) are wrapped with silicone or tetrafluoroethylene as a coating layer.

2. The tympanic membrane ventilation tube according to claim 1, characterized in that... The tube body (202) has 2-4 inner claws (201) or outer claws (203), and there are gaps between adjacent inner claws (201) or outer claws (203). The inner claws (201) or outer claws (203) are evenly distributed along the circumference of the outer wall of the tube body (202).

3. The tympanic membrane ventilation tube according to claim 1, characterized in that... The free end is straight at 0°C, and the straight free end and the tube body (202) form a straight tube; the free end is bent at 20 to 40°C, and the bent free end and the tube body (202) form a dumbbell shape; the tube body (202) is provided with a hollow channel, which is a tubular cavity, a trumpet cavity, or an arc cavity; the inner diameter of the tubular cavity remains unchanged along the axial direction of the hollow channel; The inner diameter of the inner claw end of the horn cavity along the hollow channel is smaller than the inner diameter of the outer claw end; the inner diameter of the inner claw end of the arc cavity along the hollow channel is smaller than the inner diameter of the outer claw end, and the middle part is raised radially.

4. A conveyor, characterized in that... It includes a puncture needle (101), a release tube (102), an outer tube (103), a connecting wire (104), an outer tube fixing seat (105), a connecting wire fixing seat (106), a button (107), a safety button spring (108), a safety button (109), a release spring (110), a left housing (111), and a right housing (112). One end of the outer tube (103) is provided with a release tube (102), and the other end of the outer tube (103) is fixedly connected to the outer tube fixing seat (105). The outer tube fixing seat (105) is provided with a hollow cavity. The hollow cavity of the outer tube fixing seat (105) and the tube cavity of the outer tube (103) form a sliding channel. A puncture needle (101) and a connecting wire (104) are placed in the sliding channel. The puncture needle (101) is clamped in the release tube (102). The puncture needle (101) is divided into a spike end and a connecting end. The spike end extends out of the release tube (102), and the connecting end is fixed to one end of the connecting wire (104). The connecting components form a sliding assembly. A tympanic membrane ventilation tube (2) as described in any one of claims 1 to 3 is placed in the gap between the puncture needle (101) and the release tube (102). The other end of the connecting wire (104) extends through the sliding channel and connects to the connecting wire fixing seat (106). The outer tube fixing seat (105) and the connecting wire fixing seat (106) are fastened together by the left housing (111) and the right housing (112). The outer tube fixing seat (105) is fixedly installed at the end of the housing. A sliding gap is reserved between the outer tube fixing seat (105) and the connecting wire fixing seat (106). 6) The connecting wire fixing seat (106) slides along the gap inside the housing. A release spring (110) is provided at the rear end of the connecting wire fixing seat (106). The connecting wire fixing seat (106) is connected to the button (107) through a rack and pinion assembly. The pressing part of the button (107) extends out of the housing. The button (107) is provided with a locking groove. The safety button (109) is divided into a pressing part and a locking pin. The locking pin of the safety button (109) is inserted into the locking groove of the button (107). The safety button spring (108) of the safety button (109) pushes the locking pin into the locking groove to achieve locking. Pressing the safety button (109) locks the locking pin. The pin exits the slot to unlock, and the release spring (110) ejects the connecting wire fixing seat (106) and the connecting wire (104) to move along the sliding gap. The connecting wire (104) pushes the puncture needle (101) and the tympanic ventilator tube (2) to extend out of the release tube (102) to complete the installation of the tympanic ventilator tube. By pressing the button (107), the connecting wire fixing seat (106) and the connecting wire (104) move in the opposite direction along the sliding gap. The connecting wire (104) drives the puncture needle (101) to retract to the release tube (102), so that the tympanic ventilator tube (2) is disengaged from the release tube (102).

5. A conveyor according to claim 4, characterized in that... The puncture needle (101) and the release tube (102) are fitted with a clearance. The connection end between the release tube (102) and the puncture needle (101) is claw-shaped, with the claw tip along the release tube (102). The outer wall of the release tube (102) is provided with a marking point, which is laser-etched or fluorescently sprayed. The tip of the puncture needle (101) extends out of the release tube (102) by 0.5-1.0 mm. The tip angle of the puncture needle (101) is 30-35°, 25-30°, or 20-25°. When the tip angle is less than 25°, a step needle can be used for gradual transition.

6. A conveyor according to claim 5, characterized in that... The left shell (111) and the right shell (112) are assembled to form a hand handle. The outer tube (103) of the conveyor (1) is divided into a straight section and a curved section, which are connected to form an integrated structure.

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