A composite fully automatic disposable medical biopsy needle

Abstract

The invention discloses a composite fully automatic disposable medical biopsy needle, comprising an outer shell, a fixing frame, an outer needle tube assembly, a middle needle tube assembly, an inner needle core assembly and a transmission assembly. The outer needle tube assembly, the middle needle tube assembly, the inner needle core assembly and the transmission assembly are respectively connected to the outer shell through the fixing frame. The outer needle tube assembly comprises an outer needle tube, the middle needle tube assembly comprises a middle needle tube, and the inner needle core assembly comprises an inner needle core. An outer needle tube notch is provided on the side of the outer needle tube, and the middle needle tube is inserted in the outer needle tube. The middle needle tube is also provided with a middle needle tube notch directly below the outer needle tube notch. A cutting edge is provided on at least one side of the middle needle tube notch. The inner needle core is a solid needle body, and the inner needle core is inserted in the middle needle tube. The inner needle core can move freely in the length direction of the middle needle tube, and the middle needle tube can rotate under the drive of the transmission assembly. The composite fully automatic disposable medical biopsy needle proposed in the present invention achieves the sampling effect of the three existing biopsy needles in a purely mechanical structure, while reducing or even avoiding the possibility of internal bleeding. For doctors, it can simplify the selection and reduce the risk of surgery. For manufacturers, it can effectively control the product manufacturing cost and correspondingly reduce the patient's examination and treatment costs.

Description

Technical Field

[0001] The invention relates to the field of medical instruments, in particular to a composite fully automatic disposable medical biopsy needle. Background Art

[0002] At present, the disposable medical biopsy needles used in hospitals are of the slot type, tube type and suction type. The sampling tissue of the slot type is a half-tube and half-cylindrical strip, so the sampling volume is relatively small and the shape is not complete. The sampling tissue of the tube type is a full-tube cylindrical shape, and the sampling volume is relatively large, but internal bleeding may occur during puncture and cutting. The suction type is only suitable for taking pus-like tissue. The above three types of biopsy needles may cause internal bleeding in patients during sampling due to the relative linear movement of the needle core and the needle tube exposed at the head during puncture, thereby increasing the risk of surgery and the difficulty of treatment. Summary of the invention

[0003] The purpose of the present invention is to provide a composite fully automatic disposable medical biopsy needle to solve the technical problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: The present invention discloses a composite fully automatic disposable medical biopsy needle, comprising an outer shell, a fixing frame, an outer needle tube assembly, a middle needle tube assembly, an inner needle core assembly and a transmission assembly, wherein the outer needle tube assembly, the middle needle tube assembly, the inner needle core assembly and the transmission assembly are respectively connected to the outer shell through the fixing frame, the outer needle tube assembly comprises an outer needle tube, the middle needle tube assembly comprises a middle needle tube, the inner needle core assembly comprises an inner needle core, an outer needle tube notch is provided on the side of the outer needle tube, the middle needle tube is inserted in the outer needle tube, the middle needle tube is also provided with a middle needle tube notch directly below the outer needle tube notch, at least one side of the middle needle tube notch is provided with a cutting edge, the inner needle core is a solid needle body, the inner needle core is inserted in the middle needle tube, the inner needle core can move freely in the length direction of the middle needle tube, and the middle needle tube can be quickly rotated and cut under the drive of the transmission assembly.

[0005] Description of the sampling process: When the inner needle core moves rapidly away from the end of the middle needle tube head, negative pressure is generated in the middle needle tube, and the negative pressure is transmitted to the needle tube slot. At this time, the biopsy tissue is sucked into the middle needle tube. Driven by the transmission assembly, the middle needle tube completes one circle of rotation and cutting action. At this time, the sampling is completed and the needle can be pulled out of the body.

[0006] The present invention is further improved: the outer needle tube assembly also includes an outer needle tube fixing part, the end of the outer needle tube is fixedly arranged in the outer needle tube fixing part, and the outer needle tube fixing part is fixedly arranged in the fixing frame; the middle needle tube assembly also includes a middle needle tube fixing part, a composite spiral driving part and a sealing ring, the end of the middle needle tube is fixedly arranged in the middle needle tube fixing part, the composite spiral driving part is sleeved on the outside of the middle needle tube fixing part and fixedly connected, one end of the middle needle tube fixing part is provided with a circular groove, and the composite spiral driving part is provided with a composite driving groove; the inner needle core assembly also includes a guide tube, a negative pressure tube, a push rod and a sealing ring, the end of the inner needle core is fixedly connected to the push rod, the head end of the inner needle core passes through the negative pressure tube, the guide tube, the composite spiral driving part The push rod is inserted into the middle needle tube after the component is inserted, the head end of the push rod is inserted into the negative pressure tube, the contact end surface of the push rod and the inner wall of the negative pressure tube is sealed by a sealing ring, the end of the negative pressure tube is inserted into the guide tube, the end of the middle needle tube fixing component is inserted into the head end of the negative pressure tube, and the contact end surface of the middle needle tube fixing component and the inner wall of the negative pressure tube is sealed by a sealing ring; the transmission assembly includes a transmission rod, a compression spring, and a button, the button is fixedly arranged on the outer shell, one end of the transmission rod is movably connected to the guide tube, the other end of the transmission rod is arranged in the composite driving groove of the composite spiral driving component, and can slide in the composite driving groove, one end of the compression spring is fixedly arranged in the fixing frame, the other end of the compression spring is fixedly connected to the guide tube, and the button is snap-connected to the outer shell.

[0007] Instructions for use: After the push rod is loaded (natural state), press the button, the guide tube is disengaged, and under the thrust of the compression spring, the guide tube and the push rod and other components slide backward quickly, and the negative pressure tube is fixed. In this way, the gas space in the negative pressure tube is quickly increased by 4 to 5 times or more. According to the principle of gas pressure, volume and temperature change, P1V1 / T1=P2V2 / T2, when the temperature remains unchanged, the air pressure is inversely proportional to the volume. The air pressure in the negative pressure tube will drop to about 1 / 4 of the atmospheric pressure. Through the matching gap between the middle needle tube and the inner needle core, the negative pressure is transmitted to the needle tube notch, which can generate obvious suction to suck the biopsy tissue into the middle needle tube; driven by the guide tube, the transmission rod reciprocates in a straight line in the composite drive groove, driving the composite spiral drive member to rotate, which can be converted into the rotation or pause of the middle needle tube to complete the sampling.

[0008] The present invention is further improved: a male buckle or a female buckle is fixedly provided on the guide tube, a female buckle or a male buckle is fixedly provided on the push rod, the male buckle or the female buckle of the guide tube is buckled with the female buckle or the male buckle on the push rod; an extension part is fixedly provided at one end of the guide tube, and the extension part is connected to the buckle position of the fixing frame.

[0009] The present invention is further improved as follows: a protrusion is fixedly provided on the guide tube, a through hole is fixedly opened at one end of the transmission rod, a cylindrical head is fixedly provided at the other end of the transmission rod, the protrusion of the guide tube is engaged in the through hole of the transmission rod, and the cylindrical head of the transmission rod is arranged in the composite driving groove of the composite spiral driving member and can slide in the composite driving groove.

[0010] The present invention is further improved as follows: two transmission rods are provided, two composite driving grooves are provided on the composite spiral driving member, and the two transmission rods are provided on both sides of the guide tube and symmetrically along the center line of the guide tube to improve the stability of transmission.

[0011] The present invention is further improved in that the protruding portion of the guide tube can slide in the through hole of the transmission rod, and a virtual position is provided to allow the guide tube to be pushed forward a small amount without affecting the state of the middle needle tube.

[0012] The present invention is further improved: the composite drive groove is composed of five sections, the first, third and fifth sections are straight grooves, the second and fourth sections are spiral grooves, the straight grooves and the spiral grooves are connected by rounded transition, and each section of the spiral groove stroke corresponds to a 180° rotation angle of the middle needle tube. The third section is a straight groove, which can control the time when the middle needle tube and the outer needle tube notch are facing each other to ensure reliable suction of biopsy tissue.

[0013] Control of the starting angle of the middle needle tube in the natural state: In the natural state, the middle needle tube and the outer needle tube slot are dislocated into a closed state. The cylindrical head of the transmission member is located in the first straight groove of the drive groove. There is a virtual position between the transmission member and the guide tube connection groove, which allows the guide tube to be pushed forward a small amount without affecting the state of the middle needle tube. When the cylindrical head slides to the middle straight groove of the composite drive groove, the middle needle tube slot will face the outer needle tube slot. At this time, the middle needle tube has rotated 180 degrees. This is the best time to inhale the biopsy tissue. Appropriate delay is required.

[0014] Control of the rotation angle of the middle needle tube when sampling is completed: When the cylindrical head slides to the last straight groove of the composite drive groove, the notch of the middle needle tube will be dislocated with the notch of the outer needle tube to form a closed state. The middle needle tube completes a circle of rotation and cutting action, and the sampling is completed at this time, and the needle can be pulled out of the body. Pushing the push rod component forward again can squeeze out the tissue in the middle needle tube.

[0015] The present invention is further improved as follows: the helix angle of the spiral groove is preferably 45 degrees or above.

[0016] The present invention is further improved: the shell includes a shell body and a shell head, the fixing frame includes a left fixing frame and a right fixing frame, the shell body and the shell head are detachably connected, and the left fixing frame and the right fixing frame are detachably connected, which is convenient for installation and disassembly.

[0017] The present invention is further improved by comprising a guide post which is fixedly arranged at one end of the housing head and through which the outer needle tube passes.

[0018] The composite fully automatic disposable medical biopsy needle proposed in the present invention achieves the sampling effect of the three existing biopsy needles in a purely mechanical structure, while reducing or even avoiding the possibility of internal bleeding. For doctors, it can simplify the selection and reduce the risk of surgery. For manufacturers, it can effectively control the product manufacturing cost and correspondingly reduce the patient's examination and treatment costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the three-dimensional structure decomposition of a composite fully automatic disposable medical biopsy needle proposed by the present invention;

[0020] Figure 2 This is a schematic diagram of the initial state structure of a composite fully automatic disposable medical biopsy needle proposed by the present invention;

[0021] Figure 3 for Figure 2 Schematic diagram of the AA structure;

[0022] Figure 4 This is a schematic diagram of the structure in which the outer needle tube notch and the middle needle tube notch are facing each other;

[0023] Figure 5 for Figure 4 Schematic diagram of the BB structure;

[0024] Figure 6 It is a structural schematic diagram of the outer needle tube notch returning to the closed state.

[0025] Figure 7 for Figure 6 Schematic diagram of CC structure;

[0026] Figure 8 for Figure 2 Schematic diagram of the structure after removing the outer needle tube, middle needle tube and inner needle core;

[0027] Fig. 9 for Figure 3 Schematic diagram of the structure after removing the outer needle tube, middle needle tube and inner needle core;

[0028] Fig.10 for Figure 4 Schematic diagram of the structure after removing the outer needle tube, middle needle tube and inner needle core;

[0029] Fig.11 for Figure 5 Schematic diagram of the structure after removing the outer needle tube, middle needle tube and inner needle core;

[0030] Fig.12 for Figure 6 Schematic diagram of the structure after removing the outer needle tube, middle needle tube and inner needle core;

[0031] Fig.13 for Figure 7 Schematic diagram of the structure after removing the outer needle tube, middle needle tube and inner needle core;

[0032] Fig.14 for Figure 5 Schematic diagram of the enlarged structure of the N part in the middle.

[0033] Fig.15 Schematic diagram of the structure of the composite spiral drive.

[0034] Fig.16 It is a schematic diagram of the structure of the transmission rod.

[0035] Fig.17 Schematic diagram of the structure of the guide tube. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0037] See also Figure 1-17 The present invention discloses a composite fully automatic disposable medical biopsy needle, comprising a shell, a fixing frame, an outer needle tube assembly, a middle needle tube assembly, an inner needle core assembly and a transmission assembly. The outer needle tube assembly, the middle needle tube assembly, the inner needle core assembly and the transmission assembly are respectively connected to the shell through the fixing frame. The outer needle tube assembly comprises an outer needle tube 2, the middle needle tube assembly comprises a middle needle tube 5, and the inner needle core assembly comprises an inner needle core 9. An outer needle tube notch 19 is provided on the side of the outer needle tube 2, and the middle needle tube 5 is inserted in the outer needle tube 2. A middle needle tube notch 20 is also provided in the middle needle tube 5 directly below the outer needle tube notch 19. A cutting edge is provided on at least one side of the middle needle tube notch 20. The inner needle core 9 is a solid needle body, and the inner needle core 9 is inserted in the middle needle tube 5. The inner needle core 9 can move freely in the length direction of the middle needle tube 5, and the middle needle tube 5 can rotate under the drive of the transmission assembly.

[0038] Description of the sampling process: When the inner needle core 9 moves rapidly away from one end of the middle needle tube 5, a negative pressure is generated in the middle needle tube 5, and the negative pressure is transmitted to the middle needle tube notch 20. At this time, the biopsy tissue is sucked into the middle needle tube 5. The middle needle tube 5 completes one circle of rotation and cutting action driven by the transmission assembly. At this time, the sampling is completed and the needle can be pulled out from the body.

[0039] The present invention is further improved: the outer needle tube assembly also includes an outer needle tube fixing part 3, the end of the outer needle tube 2 is fixedly arranged in the outer needle tube fixing part 3, and the outer needle tube fixing part 3 is fixedly arranged in the fixing frame; the middle needle tube assembly also includes a middle needle tube fixing part 6, a composite spiral driving part 7 and a sealing ring 8, the end of the middle needle tube 5 is fixedly arranged in the middle needle tube fixing part 6, the composite spiral driving part 7 is sleeved on the outside of the middle needle tube fixing part 6 and fixedly connected, one end of the middle needle tube fixing part 6 is provided with a circular groove, and the composite spiral driving part 7 is provided with a composite driving groove; the inner needle core assembly also includes a guide tube 15, a negative pressure tube 12, a push rod 10 and a sealing ring 8, the end of the inner needle core 9 is fixedly connected to the push rod 10, the head end of the inner needle core 9 passes through the negative pressure tube 12, the guide tube 15, the composite spiral driving part 7 and then is inserted into the middle In the needle tube 5, the head end of the push rod 10 is inserted into the negative pressure tube 12, and the contact end surface of the push rod 10 and the inner wall of the negative pressure tube 12 is sealed by the sealing ring 8, the end of the negative pressure tube 12 is inserted in the guide tube 15, and the end of the middle needle tube fixing part 6 is inserted in the head end of the negative pressure tube 12, and the contact end surface of the middle needle tube fixing part 6 and the inner wall of the negative pressure tube 12 is sealed by the sealing ring 8; the transmission assembly includes a transmission rod 4, a compression spring 11, and a push rod, the push rod is fixedly arranged on the outer shell, one end of the transmission rod 4 is movably connected with the guide tube 15, and the other end of the transmission rod 4 is arranged in the composite driving groove of the composite spiral driving part 7 and can slide in the composite driving groove, one end of the compression spring 11 is fixedly arranged in the fixing frame, and the other end of the compression spring 11 is fixedly connected with the guide tube 15, and the button 14 is connected with the outer shell by buckle.

[0040] Instructions for use: After the push rod 10 is loaded (natural state), the push rod is pressed down, and the guide tube 15 is disengaged. Under the thrust of the compression spring 11, the guide tube 15 and the push rod 10 and other components slide backward quickly, and the negative pressure tube 12 is fixed. In this way, the gas space in the negative pressure tube 12 is quickly increased by 4 to 5 times or more. According to the principle of gas pressure, volume and temperature change, P1V1 / T1=P2V2 / T2, when the temperature remains unchanged, the air pressure is inversely proportional to the volume. The air pressure in the negative pressure tube 12 will drop to about 1 / 4 of the atmospheric pressure. Through the matching gap between the middle needle tube 5 and the inner needle core 9, the negative pressure is transmitted to the needle tube notch, which can generate obvious suction to suck the biopsy tissue into the middle needle tube 5; driven by the guide tube 15, the transmission rod 4 reciprocates linearly in the composite drive groove, driving the composite spiral drive member 7 to rotate, thereby converting it into the rotation or pause of the middle needle tube 5 to complete the sampling.

[0041] The present invention is further improved: a male buckle or a female buckle is fixedly provided on the guide tube 15, and a female buckle or a male buckle is fixedly provided on the push rod, and the male buckle or the female buckle of the guide tube 15 is buckled with the female buckle or the male buckle on the push rod; an extension part 26 is fixedly provided at one end of the guide tube 15, and the extension part 26 is connected to the buckle position of the fixing frame.

[0042] The present invention is further improved: a protrusion 23 is fixedly provided on the guide tube 15, a through hole 24 is fixedly opened at one end of the transmission rod 4, and a cylindrical head 25 is fixedly provided at the other end of the transmission rod 4. The protrusion 23 of the guide tube 15 is engaged in the through hole 24 of the transmission rod 4, and the cylindrical head 25 of the transmission rod 4 is arranged in the composite driving groove of the composite spiral driving member 7 and can slide in the composite driving groove.

[0043] The present invention is further improved as follows: two transmission rods 4 are provided, two composite driving grooves are provided on the composite spiral driving member 7, and the two transmission rods 4 are provided on both sides of the guide tube 15 and symmetrically along the center line of the guide tube 15 to improve the stability of transmission.

[0044] The present invention is further improved in that the protrusion 23 of the guide tube 15 can slide in the through hole 24 of the transmission rod 4 , and a virtual position is provided to allow the guide tube 15 to be pushed forward a small amount without affecting the state of the middle needle tube 5 .

[0045] The present invention is further improved: the composite drive groove is composed of five sections, the first, third and fifth sections are straight grooves 21, the second and fourth sections are spiral grooves 22, the straight grooves 21 and the spiral grooves 22 are connected by rounded transition, and the stroke of each section of the spiral groove 22 corresponds to the 180° turning angle of the middle needle tube. The third section is a straight groove 21, which can control the time when the middle needle tube 5 is facing the outer needle tube notch 19 to ensure reliable suction of biopsy tissue.

[0046] Control of the starting angle of the middle needle tube 5 in the natural state: In the natural state, the middle needle tube 5 is misaligned with the outer needle tube notch 19 to form a closed state. The cylindrical head 25 of the transmission member is located in the first straight groove 21 of the drive groove. There is a virtual position in the connecting groove between the transmission member and the guide tube 15, which allows the guide tube 15 to be pushed forward a small amount without affecting the state of the middle needle tube 5. When the cylindrical head 25 slides to the middle straight groove 21 of the composite drive groove, the middle needle tube notch 20 will be opposite to the outer needle tube notch 19. At this time, the middle needle tube 5 has rotated 180 degrees. This is the best time to inhale the biopsy tissue. Appropriate delay is required.

[0047] When sampling is completed, the rotation angle of the middle needle tube 5 is controlled: when the cylindrical head 25 slides to the last straight groove 21 of the composite drive groove, the middle needle tube notch 20 will be dislocated with the outer needle tube notch 19 to form a closed state. The middle needle tube 5 completes a circle of rotation and cutting action, and the sampling is completed at this time, and the needle can be pulled out of the body. Pushing the push rod 10 forward again can squeeze out the tissue in the middle needle tube 5.

[0048] The present invention is further improved as follows: the helical angle of the spiral groove 22 is preferably 45 degrees or above.

[0049] The present invention is further improved: the shell includes a shell body 18 and a shell head 17, the fixing frame includes a left fixing frame 16 and a right fixing frame 1, the shell body 18 and the shell head 17 are detachably connected, and the left fixing frame 16 and the right fixing frame 1 are detachably connected, which is convenient for installation and disassembly.

[0050] The present invention is further improved by comprising a guide post 13 , which is fixedly arranged at one end of the housing head 17 , and through which the outer needle tube 2 passes.

[0051] The composite fully automatic disposable medical biopsy needle proposed in the present invention achieves the sampling effect of the three existing biopsy needles in a purely mechanical structure, while reducing or even avoiding the possibility of internal bleeding. For doctors, it can simplify the selection and reduce the risk of surgery. For manufacturers, it can effectively control the product manufacturing cost and correspondingly reduce the patient's examination and treatment costs.

[0052] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A composite fully automatic disposable medical biopsy needle, comprising a housing, a fixing frame, an outer needle tube assembly, a middle needle tube assembly, an inner needle core assembly and a transmission assembly, wherein the outer needle tube assembly, the middle needle tube assembly, the inner needle core assembly and the transmission assembly are connected to the housing through the fixing frame, and characterized in that: The outer needle tube assembly includes an outer needle tube, the middle needle tube assembly includes a middle needle tube, and the inner needle core assembly includes an inner needle core. An outer needle tube notch is opened on the side of the outer needle tube, and the middle needle tube is inserted in the outer needle tube. The middle needle tube is also opened directly below the outer needle tube notch. A cutting edge is provided on at least one side of the middle needle tube notch. The inner needle core is a solid needle body. The inner needle core is inserted in the middle needle tube. The inner needle core can move freely in the length direction of the middle needle tube, and the middle needle tube can rotate under the drive of the transmission assembly. The outer needle tube assembly also includes an outer needle tube fixing part, and the end of the outer needle tube is fixedly provided The outer needle tube fixing part is fixedly arranged in the fixing frame; the middle needle tube assembly also includes a middle needle tube fixing part, a composite spiral driving part and a sealing ring, the end of the middle needle tube is fixedly arranged in the middle needle tube fixing part, the composite spiral driving part is sleeved on the outside of the middle needle tube fixing part and fixedly connected, a circular groove is opened at one end of the middle needle tube fixing part, and a composite driving groove is opened on the composite spiral driving part; the inner needle core assembly also includes a guide tube, a negative pressure tube, a push rod and a sealing ring, the end of the inner needle core is fixedly connected to the push rod, and the head end of the inner needle core passes through the negative pressure tube, the guide tube, The composite spiral driving member is inserted into the middle needle tube at the back, the head end of the push rod is inserted into the negative pressure tube, the contact end surface of the push rod and the inner wall of the negative pressure tube is sealed by a sealing ring, the end of the negative pressure tube is inserted into the guide tube, the end of the middle needle tube fixing member is inserted into the head end of the negative pressure tube, and the contact end surface of the middle needle tube fixing member and the inner wall of the negative pressure tube is sealed by a sealing ring; the transmission assembly includes a transmission rod, a compression spring, and a button, the button is fixedly arranged on the shell, one end of the transmission rod is fixedly connected to the guide tube, the other end of the transmission rod is arranged in the composite driving groove of the composite spiral driving member, and can be in the composite spiral driving member. The key is connected to the guide tube by a buckle; the composite drive groove is composed of five sections, the first, third and fifth sections are straight grooves, the second and fourth sections are spiral grooves, the straight grooves and the spiral grooves are connected with rounded corners, and the stroke of each spiral groove corresponds to a 180° turning angle of the middle needle tube; the outer shell includes an outer shell body and an outer shell head, the fixed frame includes a left fixed frame and a right fixed frame, the outer shell body and the outer shell head are detachably connected, and the left fixed frame and the right fixed frame are detachably connected.

2. The composite fully automatic disposable medical biopsy needle according to claim 1, characterized in that: A male buckle or a female buckle is fixedly arranged on the guide tube, and a female buckle or a male buckle is fixedly arranged under the button. The male buckle or the female buckle of the guide tube is buckled with the female buckle or the male buckle of the button; an extension part is fixedly arranged at one end of the guide tube, and the extension part is fixedly connected to the compression spring.

3. The composite fully automatic disposable medical biopsy needle according to claim 1, characterized in that: A protrusion is fixedly provided on the guide tube, a through hole is fixedly opened at one end of the transmission rod, and a cylindrical head is fixedly provided at the other end of the transmission rod. The protrusion of the guide tube is engaged in the through hole of the transmission rod, and the cylindrical head of the transmission rod is arranged in the composite driving groove of the composite spiral driving component and can slide in the composite driving groove.

4. The composite fully automatic disposable medical biopsy needle according to claim 1, characterized in that: Two transmission rods are provided, two composite driving grooves are provided on the composite spiral driving member, and the two transmission rods are provided on both sides of the guide tube and are symmetrically arranged along the center line of the guide tube.

5. The composite fully automatic disposable medical biopsy needle according to claim 1, characterized in that: The protruding portion of the guide tube can slide in the through hole of the transmission rod.

6. The composite fully automatic disposable medical biopsy needle according to claim 1, characterized in that: The helix angle of the spiral groove is 45 degrees or more.

7. The composite fully automatic disposable medical biopsy needle according to claim 1, characterized in that: It also includes a guide column, which is fixedly arranged at one end of the shell head, and the outer needle tube passes through the guide column.

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