Tumor biopsy puncture equipment for biopsy sampling

Abstract

The invention relates to the technical field of biopsy puncture, and discloses a tumor biopsy puncture device for biopsy sampling, the tumor biopsy puncture device comprises an outer needle assembly and an inner needle assembly, the outer needle assembly comprises a needle base and an outer needle tube fixed with the needle base, the inner needle assembly comprises a needle cylinder and an inner needle core slidably arranged in the needle cylinder, a needle cavity is arranged at the needle tip end of the inner needle core, and the needle cavity is communicated with the needle base. An ejection mechanism is arranged in the needle cylinder, the ejection mechanism is used for triggering the inner needle core to eject outwards in the length direction of the outer needle tube, and the ejection mechanism comprises a connecting part fixed to the inner needle core, a locking piece arranged on the connecting part and used for limiting the position of the inner needle core and a pull rod fixed to the connecting part and capable of penetrating out of the needle cylinder in a sliding mode. According to the tumor biopsy puncture equipment for biopsy sampling, by arranging the ejection mechanism, compared with an existing manual operation mode, the ejection force of the inner needle core is adjusted by changing the stretching or compression degree of the elastic component, and the cutting requirements of tumor tissues of different textures can be met.

Description

Technical Field

[0001] The present invention relates to the technical field of biopsy puncture, and in particular to a tumor biopsy puncture device for biopsy sampling. Background Art

[0002] Tumor biopsy puncture is a key means for diagnosing tumors clinically, which can obtain tumor tissue samples and provide direct evidence for pathological diagnosis. During the tumor biopsy puncture process, first, CT, ultrasound, or MRI imaging equipment is used to determine the location of the tumor. Taking ultrasound guidance as an example, the reflection characteristics of ultrasound enable doctors to clearly see the image of the tumor and the position of the puncture needle on the ultrasound screen. When the puncture needle gradually approaches the tumor, the echo of the puncture needle will be displayed on the screen as a bright line. Based on this image feedback, doctors can accurately insert the puncture needle into the tumor tissue. After determining that the puncture needle reaches the ideal position, by pushing the needle core, the cutting edge on the needle core cuts off the tumor tissue and makes it stay in the needle cavity of the needle core, thereby obtaining a relatively complete tissue sample.

[0003] A biopsy sampling device for clinical use in oncology disclosed in the existing patent with publication number CN111904480A includes a needle tube, a mounting block, and a pull rod. The right end of the needle tube is fixedly arranged on the left side of the mounting block, the left end of the needle tube is fixedly provided with a puncture head for puncturing tissue, and a cutting hole with an upward opening is arranged on the needle tube near the puncture head side; a transition cavity is arranged on the left side inside the mounting block, and a connecting block is arranged in the transition cavity; a pull rod extending to the outside of the mounting block is arranged on the right side of the connecting block, a holding block is arranged at the end of the pull rod, and a spring is arranged between the holding block and the mounting block; although the above technical solution can achieve multiple samplings of the tissue at the cutting hole during a single puncture process through the cutting hole, cutting piece, and inclined groove, it has the advantages of reducing the difficulty of sampling operation and reducing the sampling time.

[0004] However, in the prior art, when manually pushing the inner needle core for cutting, due to the diversity of the texture of human tissues, tumor tissues may present different conditions such as harder, softer or calcified textures. When cutting harder tumor tissues, a greater force is required to complete the cutting. When cutting softer tumor tissues, a relatively smaller force is needed. However, currently, it is very difficult to ensure that the force and angle of each cut are exactly the same in the manual operation mode. Uneven force will result in irregular shapes and inappropriate sizes of the cut tissue blocks. When cutting hard tissues, if the force is insufficient, it may lead to incomplete cutting and the tissue blocks cannot be obtained completely. For soft tissues, uneven force may cause the tissue to be over-extruded or torn. Irregular cutting is extremely likely to cause fragmentation of the tissue sample, damage the original complete tissue structure, and result in the loss of key cell morphology and tissue structure information, thereby affecting the accurate judgment of important aspects such as tumor grading and differentiation degree by pathologists, misleading the formulation of subsequent treatment plans, and being unfavorable to the treatment and rehabilitation of patients. Therefore, there is an urgent need for a tumor biopsy puncture device for biopsy sampling to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a tumor biopsy puncture device for biopsy sampling to solve the problem that when manually pushing the inner needle core to cut tumor tissues in the above-mentioned background technology, due to the diverse tissue textures and the difficulty of ensuring consistent force and angle in manual operation, the acquisition of tissue samples is poor.

[0006] A tumor biopsy puncture device for biopsy sampling provided by the present invention adopts the following technical solutions: A tumor biopsy puncture device for biopsy sampling includes an outer needle assembly and an inner needle assembly. The outer needle assembly includes a needle seat and an outer needle tube fixed to the needle seat. The inner needle assembly includes a syringe barrel and an inner needle core slidably disposed in the syringe barrel. The tip of the inner needle core is provided with a needle cavity. The syringe barrel is located at the top of the needle seat. The inner needle core penetrates the needle seat and is inserted into the outer needle tube. An ejection mechanism is provided in the syringe barrel. The ejection mechanism is used to trigger the inner needle core to eject out along the length direction of the outer needle tube. The ejection mechanism includes a connecting portion fixed to the inner needle core, a locking member provided on the connecting portion for restricting the position of the inner needle core, and a pull rod fixed to the connecting portion and slidably passing out of the syringe barrel. A sliding sleeve is slidably sleeved outside the pull rod. A plurality of elastic members are fixedly provided between the sliding sleeve and the locking member. An adjusting sleeve is rotatably provided in the syringe barrel. A chute is opened on the adjusting sleeve. A slider fixedly connected to the sliding sleeve is slidably connected in the chute; Control the rotation of the adjusting sleeve to make the slider slide along the chute, thereby controlling the vertical up and down movement of the sliding sleeve in the syringe barrel to adjust the energy storage of the elastic members and achieve the control of the ejection force of the inner needle core.

[0007] Further, an extension rod is fixed on the adjusting sleeve, and an operating member is fixed at the other end of the extension rod. The operating member is rotatably sleeved outside the syringe barrel through a damping rotating shaft; A sliding groove for the extension rod to slide is formed on the syringe barrel, and the sliding groove extends along the axial direction of the syringe barrel.

[0008] Further, a scale ring is fixedly sleeved outside the syringe barrel, scale lines are arranged on the scale ring, and an indicating mark for aligning with the scale lines is fixed on the operating member.

[0009] Further, the locking member includes symmetrically arranged spring pieces. One end of the spring piece is fixed to the connecting portion, and a limiting block is fixed to the other end of the spring piece. Limiting grooves adapted to the limiting blocks are symmetrically formed on the inner wall of the syringe barrel, and an unlocking mechanism for releasing the clamping connection between the limiting block and the limiting groove is provided on the syringe barrel.

[0010] Further, the unlocking mechanism includes an external sleeve fixedly sleeved outside the syringe barrel, guiding holes symmetrically formed in the external sleeve, unlocking rods movably inserted into the guiding holes, limiting pieces fixed on the unlocking rods, and elastic members arranged on the unlocking rods. Two ends of the elastic member respectively abut against the inside of the guiding hole and the limiting piece. Through channels communicating with the limiting grooves are also symmetrically formed on the inner wall of the syringe barrel. One end of the unlocking rod penetrates through the guiding hole and is inserted into the through channel, and the other end of the unlocking rod penetrates outside the external sleeve and is fixed with an operating handle.

[0011] Further, the outer needle tube includes a tube body and a piercing end. A deformation mechanism is provided between the tube body and the piercing end. The deformation mechanism includes a connecting member fixed at one end close to the tube body and the piercing end, a buffer body fixed between the connecting members, and multiple groups of spherical protrusions fixed on the circumferential direction of the buffer body. Flexible tubes with the same number as and corresponding to the spherical protrusions are arranged in the tube body. The tops of the flexible tubes all penetrate into the needle base, and a liquid collecting tube is fixed in the needle base. The liquid collecting tube is in through connection with the flexible tubes.

[0012] Further, filling liquids are filled in both the flexible tubes and the liquid collecting tube. The flexible tubes are filled with the filling liquids, and the filling liquids are close to the middle position of the liquid collecting tube.

[0013] Further, the liquid collecting tube is transparent, the outer wall of the liquid collecting tube is closely attached to the inner wall of the needle base, and a visual slot is formed on the needle base.

[0014] Further, the outer end of the limiting block is arranged in an inclined surface, and the top end of the inner wall of the limiting groove is also arranged in an inclined surface.

[0015] Further, the buffer body is made of a deformable material, and the deformable material can be nitinol.

[0016] Advantages of the present invention: 1. By setting up an ejection mechanism, when it is necessary to cut tumor tissues with a relatively hard texture, the doctor rotates the adjustment sleeve, causing the sliding sleeve to move downward, further stretching the elastic component, increasing its energy storage, and enhancing the ejection force of the inner needle core. When facing tumor tissues with a relatively soft texture, the doctor rotates the adjustment sleeve in the reverse direction, causing the sliding sleeve to move upward, reducing the energy storage of the elastic component, and making the ejection force of the inner needle core gentle, thus avoiding excessive damage to soft tissues. Compared with the existing manual operation method, adjusting the ejection force of the inner needle core by changing the degree of stretching or compression of the elastic component can meet the cutting requirements of tumor tissues with different textures, effectively avoiding problems such as irregular tissue block shapes, inappropriate sizes, and sample fragmentation caused by uneven forces, thereby preserving the morphological and histological information of tumor cells to a certain extent.

[0017] 2. By setting up an unlocking mechanism, during the process of the outer needle tube entering human tissues, the clamping structure of the locking component can effectively prevent the accidental ejection of the inner needle core, avoiding unnecessary damage to normal human tissues. Unlocking can be achieved by pushing the operating handle, and the operation process is intuitive and convenient, enabling the doctor to complete the operation quickly and accurately in a complex puncture environment, further improving the accuracy and reliability of the operation.

[0018] 3. By setting up a deformation mechanism, when the outer needle tube encounters the extrusion of internal human tissues during the process of entering human tissues, the buffer body will deform under the force, causing the spherical protrusion to move towards the inside of the tube body, thereby controlling the deformation of the flexible tube and changing the outflow speed and outflow volume of the filling liquid in the flexible tube. The doctor can indirectly understand the degree of extrusion of the outer needle tube in the tissue by observing the changes in the filling liquid in the liquid collection tube, and then timely adjust the puncture force of the inner needle core. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a three-dimensional structural schematic diagram of the present invention; Figure 2 is a front-view structural sectional schematic diagram of the needle base, outer needle tube, syringe barrel, and inner needle core of the present invention; Figure 3 is a three-dimensional structural sectional schematic diagram of the syringe barrel of the present invention; Figure 4 is a three-dimensional structural schematic diagram of the sliding sleeve, adjustment sleeve, chute, slider, extension rod, and operating member of the present invention; Figure 5 is a three-dimensional structural sectional exploded schematic diagram of the syringe barrel and adjustment sleeve of the present invention; Figure 6 is a three-dimensional structural schematic diagram of the syringe barrel, operating member, scale ring, and indication mark of the present invention; Figure 7 is a three-dimensional structural schematic diagram of the connecting portion and locking member of the present invention; Figure 8Schematic three-dimensional structure diagram of the needle seat, outer needle tube, inner needle core and deformation mechanism of the present invention; Figure 9 Schematic cross-sectional three-dimensional structure diagram of the tube body, piercing end and deformation mechanism of the present invention; Figure 10 Schematic cross-sectional three-dimensional structure diagram of the needle seat, tube body, flexible tube and liquid collection tube of the present invention; Figure 11 Schematic top view of the three-dimensional structure of the needle seat, outer needle tube, inner needle core, flexible tube and liquid collection tube of the present invention; Figure 12 Schematic front view of the extrusion state of the buffer body, spherical protrusion and flexible tube of the present invention.

[0020] In the figure: 1. Needle seat; 111. Visual groove; 2. Outer needle tube; 21. Tube body; 22. Piercing end; 3. Syringe barrel; 311. Sliding groove; 312. Limiting groove; 313. Channel; 4. Inner needle core; 5. Needle cavity; 6. Ejection mechanism; 61. Connecting part; 62. Locking part; 621. Spring piece; 622. Limiting block; 63. Pull rod; 64. Sliding sleeve; 65. Elastic component; 66. Adjusting sleeve; 661. Extension rod; 662. Operating part; 663. Scale ring; 664. Indication mark; 67. Slide groove; 68. Slide block; 7. Unlocking mechanism; 71. Outer sleeve; 72. Guide hole; 73. Unlocking rod; 74. Limiting piece; 75. Elastic piece; 76. Operating handle; 8. Deformation mechanism; 81. Connecting piece; 82. Buffer body; 83. Spherical protrusion; 84. Flexible tube; 85. Liquid collection tube. Detailed implementation manners

[0021] To make the above objects, features and advantages of the present invention more obvious and understandable, the following will describe the detailed implementation manners of the present invention with reference to the accompanying drawings of the specification.

[0022] Refer to Figures 1-3 , the present invention provides a tumor biopsy puncture device for biopsy sampling, including an outer needle assembly and an inner needle assembly. The outer needle assembly includes a needle seat 1 and an outer needle tube 2 fixed to the needle seat 1. The inner needle assembly includes a syringe barrel 3 and an inner needle core 4 slidably disposed in the syringe barrel 3. A needle cavity 5 is provided at the needle tip of the inner needle core 4. The syringe barrel 3 is located at the top of the needle seat 1. The inner needle core 4 penetrates through the needle seat 1 and is inserted into the outer needle tube 2. An ejection mechanism 6 is provided in the syringe barrel 3, and the ejection mechanism 6 is used to trigger the inner needle core 4 to eject out along the length direction of the outer needle tube 2.

[0023] Specifically, the ejection mechanism 6 includes a connection part 61 fixed to the inner needle core 4, a locking part 62 provided on the connection part 61 for restricting the position of the inner needle core 4, and a pull rod 63 fixed to the connection part 61 and slidably passing through the outside of the syringe barrel 3. The pull rod 63 is limited by bumps on both sides and slidably passes through the outside of the syringe barrel 3. A sliding sleeve 64 is slidably sleeved on the pull rod 63, and the pull rod 63 and the sliding sleeve 64 are also connected in a limited-sliding manner. A plurality of groups of elastic members 65 are fixedly provided between the sliding sleeve 64 and the locking part 62. The elastic members 65 can be springs. An adjusting sleeve 66 is rotatably provided in the syringe barrel 3. The adjusting sleeve 66 is rotatably connected to the inner wall of the syringe barrel 3 through a bearing. A chute 67 is provided on the adjusting sleeve 66, and a slider 68 fixed to the sliding sleeve 64 is slidably connected in the chute 67. By controlling the rotation of the adjusting sleeve 66, the slider 68 slides along the chute 67, thereby controlling the vertical up-and-down movement of the sliding sleeve 64 in the syringe barrel 3 to adjust the energy storage of the elastic members 65 and realize the control of the ejection force of the inner needle core 4.

[0024] When the adjusting sleeve 66 is rotated, the slider 68 is restricted by the chute 67 and can only slide along a specific trajectory, thereby driving the sliding sleeve 64 to perform vertical up-and-down movement in the syringe barrel 3. The movement of the sliding sleeve 64 changes the stretching or compression degree of the elastic members 65, so as to adjust their energy storage. When cutting a harder tumor tissue, the doctor rotates the adjusting sleeve 66 to make the sliding sleeve 64 move downward, further stretching the elastic members 65 and increasing their energy storage. When ejecting, a greater ejection force can be given to the inner needle core 4 to ensure that the harder tissue can be cut smoothly. When facing a softer tumor tissue, the adjusting sleeve 66 is rotated in the reverse direction to make the sliding sleeve 64 move upward, reducing the energy storage of the elastic members 65. When the inner needle core 4 ejects, the force is gentle, avoiding excessive damage to the soft tissue. Compared with the existing manual operation method, by adjusting the ejection force of the inner needle core 4, the cutting requirements of tumor tissues with different textures can be adapted, effectively avoiding problems such as irregular tissue block shapes, inappropriate sizes, and sample fragmentation caused by uneven force.

[0025] Refer to Figures 4-6 As shown in the figure, an extension rod 661 is fixed to the adjusting sleeve 66, and an operating member 662 is fixed to the other end of the extension rod 661. The operating member 662 can be a circular knob. The operating member 662 is rotatably sleeved outside the syringe barrel 3 through a damping rotating shaft. When the doctor holds the operating member 662 and applies a rotational force, the operating member 662 starts to rotate around the damping rotating shaft. Due to the presence of the damping material, the operating member 662 will feel a certain resistance during the rotation process. When the doctor stops applying the rotational force, the damping material will prevent the operating member 662 from continuing to rotate due to inertia, so that the operating member 662 can stop at the required position.

[0026] It should be noted that a sliding groove 311 for the sliding of the extension rod 661 is formed in the syringe 3. The sliding groove 311 extends along the axial direction of the syringe 3. When the doctor rotates the operating member 662, the operating member 662 drives the extension rod 661 to perform a circular motion around the damping rotating shaft, and the extension rod 661 slides synchronously in the sliding groove 311, thereby driving the adjusting sleeve 66 to rotate within the syringe 3.

[0027] Wherein, a scale ring 663 is fixedly sleeved outside the syringe 3, scale lines are provided on the scale ring 663, and an indicating mark 664 for aligning with the scale lines is fixed on the operating member 662. When the doctor rotates the operating member 662, the indicating mark 664 rotates together with the operating member 662. By observing the relative position between the indicating mark 664 and the scale lines on the scale ring 663, the doctor can know the current rotation angle of the adjusting sleeve 66 and the corresponding ejection force setting of the inner needle core 4.

[0028] Referring to Figure 3 、 Figures 5-7 As shown in FIGS.

[0029] Specifically, referring to Figure 3, the unlocking mechanism 7 includes an external sleeve 71 fixedly sleeved outside the syringe barrel 3, guiding holes 72 symmetrically formed inside the external sleeve 71, unlocking rods 73 movably inserted into the guiding holes 72, a limiting piece 74 fixed on the unlocking rods 73, and an elastic member 75 provided on the unlocking rods 73. The two ends of the elastic member 75 respectively abut against the inside of the guiding hole 72 and the limiting piece 74. The elastic member 75 can be a spring. The inner wall of the syringe barrel 3 is also symmetrically provided with channels 313 that are connected to the limiting grooves 312 in a penetrating manner. One end of the unlocking rod 73 penetrates through the guiding hole 72 and is inserted into the channel 313, and the other end of the unlocking rod 73 penetrates outside the external sleeve 71 and is fixed with an operating handle 76. When the unlocking rod 73 is not subjected to an external force, the elastic member 75 is in a natural stretching state and pushes the limiting piece 74, so that the unlocking rod 73 is kept in the channel 313 and located outside the limiting block 622. When the doctor confirms that the outer needle tube 2 has reached the ideal position of the tumor tissue and needs to perform the ejection cutting operation of the inner needle core 4, the doctor squeezes the operating handle 76 inward. The operating handle 76 drives the unlocking rod 73 to move in the guiding hole 72 against the elastic force of the elastic member 75 in the direction of the limiting block 622. As the unlocking rod 73 gradually pushes open the limiting block 622, the limiting block 622 is separated from the limiting groove 312. At this time, since the clamping connection between the limiting block 622 and the limiting groove 312 is released, under the elastic force accumulated by the elastic member 65, the connecting portion 61 drives the inner needle core 4 to quickly pop out along the length direction of the outer needle tube 2, completing the cutting operation on the tumor tissue.

[0030] Further, referring to Figures 8-12 , the outer needle tube 2 includes a tube body 21 and a piercing end 22. A deformation mechanism 8 is provided between the tube body 21 and the piercing end 22. The deformation mechanism 8 includes a connecting member 81 fixed at one end close to the tube body 21 and the piercing end 22, a buffer body 82 fixed between the connecting members 81, and a plurality of groups of spherical protrusions 83 fixed on the circumferential direction of the buffer body 82. Flexible tubes 84 with the same number as and corresponding to the spherical protrusions 83 one by one are provided in the tube body 21. The tops of the flexible tubes 84 all penetrate into the needle base 1. A liquid collecting tube 85 is fixed in the needle base 1. The liquid collecting tube 85 is connected to the end of the flexible tube 84 far from the spherical protrusions 83 in a penetrating manner. Filling liquids are filled in both the flexible tubes 84 and the liquid collecting tube 85. The flexible tubes 84 are filled with the filling liquid, and the filling liquid is close to the middle position of the liquid collecting tube 85. When the outer needle tube 2 gradually approaches the tumor tissue, the tissue near the tumor will first contact the spherical protrusions 83. Due to the different textures of the tumor tissues, their responses to external forces are also different. When the harder tumor tissue contacts the spherical protrusions 83, a greater extrusion force will be applied, while the softer tumor tissue applies a relatively smaller extrusion force. Under the action of the external tissue pressure, the buffer body 82 deforms, and the spherical protrusions 83 squeeze the corresponding flexible tubes 84. When the flexible tubes 84 are squeezed, they will deform, and then squeeze the filling liquid pre-filled inside them. Under the action of the pressure difference, the filling liquid flows into the liquid collecting tube 85 in the needle base 1 along the flexible tubes 84.

[0031] Among them, the liquid collecting tube 85 is transparent, the outer wall of the liquid collecting tube 85 is close to the inner wall of the needle seat 1, and a visual slot 111 is opened on the needle seat 1. During the puncture process, the doctor can clearly observe the position change of the filling liquid in the liquid collecting tube 85 through the visual slot 111. Since the squeezing force of the spherical protrusion 83 and the flexible tube 84 is different due to the different textures of tumor tissues, the amount of filling liquid flowing into the liquid collecting tube 85 is also different. For example, when encountering hard tumor tissue, the greater squeezing force will cause more filling liquid to flow into the liquid collecting tube 85, and the position of the filling liquid will rise significantly. When facing softer tumor tissue, the amount of filling liquid flowing in is relatively small, and the filling liquid position rises less. The doctor can analyze the hardness of the tumor tissue according to the change of the filling liquid position combined with experience, and thus adjust the puncture force in time.

[0032] It should be noted that the buffer body 82 is made of a deformable material, which may be a nickel-titanium alloy. The nickel-titanium alloy has shape memory properties and superelasticity. It can undergo a large elastic deformation when subjected to force, and can return to its original shape after the external force is removed. When the outer needle tube 2 encounters extrusion from the internal tissue of the human body during the process of entering the human tissue, the buffer body 82 will deform due to the force, thereby causing the spherical protrusion 83 to move toward the inside of the tube body 21, thereby squeezing the flexible tube 84.

[0033] The present invention provides a tumor biopsy puncture device for biopsy sampling. The working principle is as follows: When in use, pull rod 63 is pulled upward, so that locking piece 62 drives connecting part 61 and inner needle core 4 to move upward, and limit block 622 moves toward limit groove 312 under the elastic force of spring sheet 621. When limit block 622 moves to the position that is completely aligned with limit groove 312, the elastic force of spring sheet 621 instantly bounces limit block 622 into limit groove 312, completes the card connection and locks, limits the position of inner needle core 4, and then, the doctor holds the device, inserts outer needle tube 2 into human tissue and gradually approaches tumor, and the tube of outer needle tube 2 is The deformation mechanism 8 between the body 21 and the insertion end 22 plays a role, and the spherical protrusion 83 is deformed when squeezed by the internal tissue of the human body. The spherical protrusion 83 drives the buffer body 82 to move toward the tube body 21, squeezing the flexible tube 84. At the same time, the tissue near the tumor contacts the spherical protrusion 83, and different squeezing forces are applied due to different textures of the tumor, causing the filling liquid in the flexible tube 84 to flow into the liquid collecting tube 85. The doctor can observe the position change of the filling liquid in the liquid collecting tube 85 through the visual slot 111 on the needle seat 1, analyze the texture of the tumor, and adjust the puncture force of the inner needle core 4; After the puncture is in place, if it is necessary to adjust the ejection force of the inner needle core 4, the doctor rotates the operating member 662 forward or backward. The operating member 662 drives the extension rod 661 to make a circular motion around the damping rotating shaft, thereby driving the adjusting sleeve 66 to rotate, causing the slider 68 to slide along the chute 67 on the adjusting sleeve 66, controlling the up and down movement of the sliding sleeve 64, and adjusting the energy storage of the elastic member 65 to adapt to the texture of the tumor. When the energy storage adjustment of the inner needle core 4 is completed, the doctor squeezes the operating handle 76, and the unlocking rod 73 moves against the elastic force of the elastic member 75, pushing open the limiting block 622 to release the limit. The inner needle core 4 ejects along the length direction of the outer needle tube 2 under the action of the elastic force stored in the elastic member 65 to cut the tumor tissue and complete the biopsy sampling. After the sampling is completed, the pull rod 63 is pulled upward again to make the inner needle core 4 return to the outer needle tube 2, and then the outer needle tube 2 is pulled out of the body.

[0034] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. A tumor biopsy puncture device for biopsy sampling, comprising an outer needle assembly and an inner needle assembly. The outer needle assembly includes a needle holder and an outer needle tube fixed to the needle holder. The inner needle assembly includes a syringe barrel and an inner needle core slidably disposed within the syringe barrel. The needle tip of the inner needle core is provided with a needle cavity. The syringe barrel is located at the top of the needle holder. The inner needle core passes through the needle holder and is inserted into the outer needle tube. It is characterized in that: An ejection mechanism is provided inside the syringe barrel. The ejection mechanism is used to trigger the inner needle core to eject out along the length direction of the outer needle tube. The ejection mechanism includes a connection part fixed to the inner needle core, a locking part provided on the connection part for restricting the position of the inner needle core, and a pull rod fixed to the connection part and slidably passing through the outside of the syringe barrel. A sliding sleeve is slidably sleeved outside the pull rod, and multiple groups of elastic components are fixedly arranged between the sliding sleeve and the locking part. An adjusting sleeve is rotatably arranged inside the syringe barrel. A sliding groove is opened on the adjusting sleeve, and a slider fixed to the sliding sleeve is slidably connected inside the sliding groove; Control the rotation of the adjusting sleeve to make the slider slide along the sliding groove, thereby controlling the vertical up-and-down movement of the sliding sleeve inside the syringe barrel to adjust the energy storage of the elastic components and realize the control of the ejection force of the inner needle core.

2. The tumor biopsy puncture device for biopsy sampling according to claim 1, characterized in that: An extension rod is fixed to the adjusting sleeve, and an operating part is fixed to the other end of the extension rod. The operating part is rotatably sleeved outside the syringe barrel through a damping rotating shaft; A sliding groove for the extension rod to slide is opened on the syringe barrel, and the sliding groove extends along the axial direction of the syringe barrel.

3. The tumor biopsy puncture device for biopsy sampling according to claim 2, wherein: A scale ring is fixedly sleeved outside the syringe barrel, scale lines are provided on the scale ring, and an indicating mark for aligning with the scale lines is fixed on the operating part.

4. The tumor biopsy puncture device for biopsy sampling according to claim 1, characterized in that: The locking part includes symmetrically arranged spring pieces. One end of the spring piece is fixed to the connection part, and a limiting block is fixed to the other end of the spring piece. Limiting grooves adapted to the limiting blocks are symmetrically opened on the inner wall of the syringe barrel, and an unlocking mechanism for releasing the clamping connection between the limiting block and the limiting groove is provided on the syringe barrel.

5. The tumor biopsy puncture device for biopsy sampling according to claim 4, characterized in that: The unlocking mechanism includes an external sleeve fixedly sleeved outside the syringe barrel, guiding holes symmetrically opened inside the external sleeve, unlocking rods movably inserted into the guiding holes, limiting pieces fixed to the unlocking rods, and elastic components provided on the unlocking rods. The two ends of the elastic components respectively abut against the inside of the guiding holes and the limiting pieces. A channel communicating with the limiting groove is also symmetrically opened on the inner wall of the syringe barrel. One end of the unlocking rod penetrates through the guiding hole and is inserted into the channel, and the other end of the unlocking rod penetrates outside the external sleeve and is fixed with an operating handle.

6. The tumor biopsy puncture device for biopsy sampling according to claim 1, characterized in that: The outer needle tube includes a tube body and a piercing end. A deformation mechanism is provided between the tube body and the piercing end. The deformation mechanism includes a connecting piece fixed to one end close to the tube body and the piercing end, a buffer body fixed between the connecting pieces, and multiple groups of spherical protrusions fixed on the circumferential direction of the buffer body. Flexible tubes with the same number as the spherical protrusions and corresponding to them are provided inside the tube body. The top ends of the flexible tubes all penetrate into the needle seat, and a liquid collecting tube is fixed inside the needle seat. The liquid collecting tube is in through connection with the flexible tubes.

7. The tumor biopsy puncture device for biopsy sampling according to claim 6, characterized in that: Filling liquids are filled inside both the flexible tubes and the liquid collecting tube. The flexible tubes are filled with the filling liquids, and the filling liquids are close to the middle position of the liquid collecting tube.

8. The tumor biopsy puncture device for biopsy sampling according to claim 7, characterized in that: The liquid collecting tube is transparently arranged. The outer wall of the liquid collecting tube is closely attached to the inner wall of the needle seat, and a visible groove is opened on the needle seat.

9. The tumor biopsy puncture device for biopsy sampling according to claim 4, wherein: The outer end of the limiting block is beveled, and the top end of the inner wall of the limiting groove is also beveled.

10. The tumor biopsy puncture device for biopsy sampling according to claim 6, wherein: The buffer body is made of a deformable material, and the deformable material can be nitinol.

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