Handheld biopsy device

Abstract

The utility model provides a handheld biopsy device which comprises a shell, a puncture assembly, a pushing tube, a driving unit and a feeding unit arranged in the shell, the puncture assembly comprises an inner knife tube and an outer knife tube provided with a sampling groove, the near end of the outer knife tube is arranged in the shell, the far end of the inner knife tube is movably inserted in the outer knife tube, and the inner knife tube is arranged in the shell. The pushing pipe is fixedly arranged at the near end of the inner knife pipe in a sleeving mode, a first blocking piece and a second blocking piece are arranged on the outer side wall of the pushing pipe, the feeding unit comprises a driving piece, a first elastic piece, a driven piece and a second elastic piece, the far end of the first elastic piece is connected with the first blocking piece, and the near end of the second elastic piece is connected with the second blocking piece; the driving part is rotatably arranged on the outer side of the driven part in a sleeving mode and used for driving the driven part to move, the driving unit drives the driving part to rotate, the driving unit is provided with an encoder used for obtaining the number of rotation turns of the driving part, the feeding depth of the inner cutter pipe is determined through the encoder, and the cutting precision of the inner cutter pipe can be improved while the opening and closing size of the sampling groove is controlled.

Description

Technical Field

[0001] This application relates to the field of biopsy device technology, and further to a handheld biopsy device. Background Technology

[0002] Biopsy devices are important medical instruments in neurosurgery, used to collect samples of living tissue from patients during biopsies of organs such as the kidneys, liver, lungs, breasts, and thyroid glands. Due to their high safety, small surgical incisions, minimal bleeding, rapid healing, low pain during the procedure, convenience, high efficiency, and the fact that hospitalization is not required, biopsy needles have become increasingly widely used in recent years.

[0003] Biopsy devices primarily utilize a vacuum-assisted mechanism to draw lesion tissue into a sampling chamber. A cutting blade then cuts the lesion tissue from the chamber, and negative pressure forces it back into a sample collector. Doctors then perform a pathological biopsy on the sample, analyzing the tissue for pathological analysis. This process often requires precise control of the sampling chamber's opening and closing. However, current technology lacks the ability to accurately measure the cutting catheter's feed distance, often requiring operators to rely on experience, making precise control of the feed distance difficult.

[0004] Therefore, this utility model aims to provide a handheld biopsy device to solve the above-mentioned technical problems. Utility Model Content

[0005] To address the aforementioned technical problems, the purpose of this application is to provide a handheld biopsy device, which aims to achieve accurate control of the opening and closing size of the sampling slot of the biopsy device by having the encoder obtain the number of rotations of the active component through the cooperation of the drive unit and the feed unit.

[0006] To achieve the above objectives, this application provides a handheld biopsy device, comprising:

[0007] case;

[0008] A puncture assembly, comprising an inner blade tube and an outer blade tube with a sampling groove, wherein the proximal end of the outer blade tube is disposed within the housing, and the distal end of the inner blade tube is movably inserted into the outer blade tube through the proximal end of the outer blade tube.

[0009] A push tube is disposed inside the housing and sleeved and fixed on the outside of the proximal end of the inner knife tube. A first stop and a second stop are sequentially provided on the outer wall of the push tube in the direction away from the distal end of the inner knife tube.

[0010] The feeding unit disposed within the housing includes a driving member, and a first elastic member, a driven member, and a second elastic member sequentially connected and sleeved on the outside of the push tube. The distal end of the first elastic member is connected to the first stop, and the proximal end of the second elastic member is connected to the second stop. The driving member is rotatably sleeved on the outside of the driven member to drive the driven member to move.

[0011] A drive unit is provided to drive the active component to rotate, and the drive unit is equipped with an encoder for obtaining the number of rotations of the active component. The drive unit determines the feed distance of the inner tool tube based on the number of rotations.

[0012] In some embodiments, the distal end of the inner blade tube is configured as a cutting end, which is adapted to engage with the inner wall of the outer blade tube.

[0013] The driven member is used to compress the first elastic member or the second elastic member. When the first elastic member or the second elastic member is in a fully compressed state, the cutting end moves relative to the outer blade tube under the action of the driven member.

[0014] In some embodiments, a first limiting member is provided on the inner wall of the housing. The first limiting member is located on the side of the first stop away from the second stop. When the push tube abuts against the first limiting member, the cutting end moves to the far end of the sampling groove.

[0015] In some embodiments, the push tube is in the shape of a regular polygonal prism, and the driven member has a receiving cavity that matches the push tube, so that the driven member can be movably sleeved on the outside of the push tube.

[0016] In some embodiments, the driving member includes a threaded section and a blanking section that match the driven member, the threaded section being disposed at the distal end of the driving member and the blanking section being disposed at the proximal end of the threaded section;

[0017] The driven member has an external thread on its outer side that mates with the threaded section, so that the driving member and the driven member can be threadedly connected.

[0018] When the push tube abuts against the first limiting member, the driven member remains threadedly connected to the threaded segment. When the driven member moves away from the first limiting member, the driven member is adapted to separate from the threaded segment and move into the blank segment.

[0019] In some embodiments, a first gear and a second gear fixedly sleeved on the distal end of the driving member are also included. The first gear is disposed on the side of the second gear away from the cutting end and is sleeved and fixed on the outside of the push tube for driving the inner blade tube to rotate.

[0020] A notch is provided on one side of the housing, and the first gear and the second gear are partially disposed outside the housing through the notch. The drive unit is adapted to be connected to the first gear and the second gear for transmission.

[0021] In some embodiments, the cutting end is trumpet-shaped and has a notch groove provided along the extension direction of the inner blade tube. One edge of the notch groove at its distal end coincides with the side wall of the inner blade tube and is connected to the outside, so that the cutting end can be engaged with the inner wall of the outer blade tube.

[0022] In some embodiments, the housing is further provided with a second limiting member and an extension, the extension being disposed on the side wall of the first gear away from the second gear and sleeved on the outside of the push tube;

[0023] The second limiting member is disposed on the top wall of the housing and is disposed opposite to the extension. The extension rotates under the action of the first gear and is adapted to be limited and engaged with the second limiting member to prevent the notch from rotating to the sampling groove.

[0024] In some embodiments, a power handle detachably mounted on the housing is also included, the drive unit being disposed within the power handle, and the output end of the drive unit extending from within the power handle.

[0025] In some embodiments, the drive unit includes a drive element and a control element, the drive element being adapted to be driveably connected to the driving element, and the encoder being disposed on the drive element for acquiring the number of rotations of the drive element;

[0026] The control element is electrically connected to the drive component and is used to control the drive component and determine the feed depth of the inner cutter tube based on the number of rotations.

[0027] Compared with the prior art, the handheld biopsy device provided in this application has the following advantages:

[0028] 1. The handheld biopsy device provided by this utility model, by setting up a drive unit and a feed unit, can drive the active component to rotate during operation, thereby causing the driven component to move along the extension direction of the inner knife tube under the action of the active component, thereby generating a forward or backward thrust on the push tube, thereby driving the inner knife tube to move forward or backward. During this process, the number of rotations of the active component can be obtained through the encoder configured in the drive unit, thereby determining the infeed or retraction distance of the inner knife tube, thereby realizing the monitoring of the feed distance of the inner knife tube and the accurate control of the opening and closing size of the sampling slot.

[0029] 2. The handheld biopsy device provided by this utility model has a first limiting member set on the inner wall of the shell. When the active member drives the inner knife tube to move forward, when the cutting end moves to the far end of the sampling groove, the push tube abuts against the first limiting member and cannot continue to move forward. When the inner knife tube retracts, the encoder can use the first limiting member as the starting point, so that the encoder can obtain the feed distance of the inner tube and accurately determine the opening and closing size of the sampling groove through the feed distance.

[0030] 3. The handheld biopsy device provided by this utility model, when the cutting end is set inside the outer blade tube, the trumpet-shaped cutting end can be engaged with the inner wall of the outer blade tube under the action of the notch groove. When the driven member fully compresses the first elastic member or the second elastic member, the inner blade tube needs the driving member to continue to rotate before it can move forward or backward, thus ensuring the stability of the inner blade tube and ensuring the accuracy of the inner blade tube feed distance.

[0031] 4. The handheld biopsy device provided by this utility model, by setting an extension and a second limiting member, is used to limit the rotation angle of the inner blade tube, prevent the notch from rotating to the position corresponding to the sampling groove, thereby preventing the cutting end from expanding at the sampling groove, and thus avoiding the cutting end from being squeezed and rolled against the edge of the sampling groove, ensuring the cutting effect of the cutting end. Attached Figure Description

[0032] The preferred embodiments will now be described in a clear and easy-to-understand manner, in conjunction with the accompanying drawings, to further explain the above-mentioned characteristics, technical features, advantages, and implementation methods of this application.

[0033] Figure 1 This is a schematic diagram of the structure of a handheld biopsy device provided by this utility model;

[0034] Figure 2 This is a front view of a handheld biopsy device provided by this utility model;

[0035] Figure 3 This is a cross-sectional view of a handheld biopsy device provided by this utility model;

[0036] Figure 4 This is a schematic diagram of the internal structure of a handheld biopsy device provided by this utility model;

[0037] Figure 5 This is a cross-sectional view of the active component provided by this utility model;

[0038] Figure 6 This is another cross-sectional view of a handheld biopsy device provided by this utility model;

[0039] Figure 7 This is a schematic diagram of the cutting end of a handheld biopsy device provided by this utility model.

[0040] Reference numerals: 1. Housing; 11. First limiting member; 12. Upper half-shell; 13. Lower half-shell; 14. Second limiting member; 15. Mounting plate; 2. Outer blade tube; 21. Sampling groove; 3. Inner blade tube; 31. First stop; 32. Second stop; 33. Cutting end; 34. Notch; 4. Feed unit; 41. Driving member; 411. Threaded section; 412. Blank section; 413. Second gear; 42. Driven member; 43. First elastic member; 44. Second elastic member; 45. First gear; 451. Extension; 452. Snap-fitting part; 5. Push tube. Detailed Implementation

[0041] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the specific implementation methods of this application will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without creative effort.

[0042] To keep the drawings concise, each drawing only schematically shows the parts relevant to the application; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" can mean not only "only one" but also "more than one."

[0043] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0044] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0045] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0046] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0047] In one embodiment, a handheld biopsy device is described, which realizes the forward and backward movement of the inner blade tube 3 by setting a drive unit that drives the feed unit 4, and obtains the number of rotations of the active member 41 by configuring an encoder on the drive unit, so that the drive unit can determine the feed distance of the inner blade tube 3 based on the number of rotations.

[0048] For ease of explanation, "far end" is defined as the end of the handheld biopsy device that is furthest from the operator when the operator uses the device, and "proximal end" is the end of the device that is closest to the operator. Additionally, "advance" and "forward" are defined as the inner blade tube 3 moving away from the operator, and "retract" and "backward" are defined as the inner blade tube 3 moving closer to the operator.

[0049] Specifically, please refer to the accompanying drawings in the instruction manual. Figures 1 to 7A handheld biopsy device includes a housing 1, a puncture assembly, a push tube 5, a feed unit 4, and a drive unit. The puncture assembly includes an outer blade tube 2 and an inner blade tube 3. A sampling groove 21 is provided on the outer wall of the outer blade tube 2, allowing lesion tissue to enter the outer blade tube 2 through the sampling groove 21 under the action of a negative pressure device. The proximal end of the outer blade tube 2 is fixed to the distal end of the housing 1. Correspondingly, the distal end of the inner blade tube 3 is movably inserted into the outer blade tube 2 through the proximal end of the outer blade tube 2, so that the inner blade tube 3 can move relative to the outer blade tube 2, adjusting the feed distance of the inner blade tube 3. The push tube 5 and the feed unit 4 are disposed inside the housing 1. The push tube 5 is sleeved and fixed on the outside of the inner knife tube 3 and located at the proximal end of the inner knife tube 3. In addition, a first stop 31 and a second stop 32 are provided on the outer wall of the push tube 5 along the extension direction of the push tube 5. The first stop 31 is disposed near the far end of the push tube 5, and the second stop 32 is disposed near the proximal end of the push tube 5.

[0050] Further, the feeding unit 4 includes an active member 41, a driven member 42, a first elastic member 43, and a second elastic member 44. The first elastic member 43, the driven member 42, and the second elastic member 44 are sequentially connected and sleeved on the outside of the driven member 42, allowing the driven member 42 to move relative to the push tube 5. The end of the first elastic member 43 away from the driven member 42 is connected to the side of the first stop 31 near the second stop 32, and the end of the second elastic member 44 away from the driven member 42 is connected to the side of the second stop 32 near the first stop 31. This allows the driven member 42 to compress the first elastic member 43 when it moves forward and to compress the second elastic member 44 when it moves backward. Correspondingly, the active member 41 is rotatably sleeved on the outside of the driven member 42 and is drively connected to the driven member 42, used to drive the driven member 42 to move along the extension direction of the push tube 5. The drive unit is used to drive the active member 41 to move. The drive unit is equipped with an encoder for obtaining the number of rotations of the active member 41. The drive unit determines the feed distance of the inner tool tube 3 based on the number of rotations.

[0051] Understandably, the feed distance of the inner blade tube often determines the opening and closing size of the sampling slot 21, which is a crucial factor in the cutting of lesion tissue. Therefore, the feed distance of the inner blade tube 3 is a very important parameter. However, in existing technologies, handheld biopsy devices often cannot obtain the feed distance during use, requiring operators to rely on experience or the movement time of the inner blade tube to determine its movement distance. In this embodiment, the encoder configured in the drive unit can obtain the number of rotations of the driving member 41, and then determine the movement distance of the driven member 42 and the inner blade tube 3 based on the number of rotations, thereby determining the opening and closing size of the sampling slot 21 based on the movement distance.

[0052] In one embodiment, a handheld biopsy device further includes a power handle, which is detachably mounted on the housing 1 and a drive unit is mounted inside the power handle. The output end of the drive unit extends out from inside the power handle and is adapted to be connected to the active member 41 for driving the active member 41 to rotate, thereby driving the driven member 42 to move forward or backward, thereby adjusting the feed distance of the inner blade tube 3.

[0053] Generally, handheld biopsy devices are also equipped with a main unit, which can display the feed distance of the inner blade tube 3 determined by the drive unit based on the number of rotations on the display screen, so that the staff can obtain the feed distance of the inner blade tube 3 in a timely manner.

[0054] In one implementation, see the accompanying drawings in the specification. Figure 3 and Figure 4 This embodiment further describes a handheld biopsy device. A first stop 31 is located on the outer side of the distal end of the push tube 5 and is arranged circumferentially along the push tube 5. To facilitate the installation and maintenance of the handheld biopsy device, an inner groove is provided on the push tube 5 along its circumference. Correspondingly, the second stop 32 includes a clamp and a retaining ring. The clamp has a notch section, allowing it to engage with the inner groove through the notch section, and the clamp portion is located outside the inner groove. The retaining ring is sleeved on the outer side of the push tube 5 and is located on the side of the clamp near the second elastic member 44. The clamp can restrict the rearward movement of the second elastic member 44, and the clamp can be easily removed from the push tube 5 through the notch section to facilitate the disassembly and maintenance of the handheld device.

[0055] Of course, in actual production applications, there are various specific structures for the first stop 31 and the second stop 32, which will not be described one by one here, but are all within the protection scope of this utility model.

[0056] In one embodiment, see the accompanying drawings. Figure 7 This embodiment further describes a handheld biopsy device. The distal end of the inner blade tube 3 is configured as a cutting end 33, which is adapted to engage with the outer blade tube 2. When the cutting end 33 engages with the outer blade tube 2, the inner blade tube 3 cannot move relative to the outer blade tube 2.

[0057] It should be noted that the driving member 41 is used to drive the driven member 42 to move forward or backward, thereby compressing the first elastic member 43 or the second elastic member 44. When the driven member 42 moves forward and fully compresses the first elastic member 43, the driven member 42 must continue to move to drive the push tube 5 forward, thus causing the cutting end 33 to move forward. Similarly, when the driven member 42 moves backward and fully compresses the second elastic member 44, the driven member 42 must continue to move backward to drive the push tube 5 backward, thus causing the cutting end 33 to move backward.

[0058] Understandably, the design of the cutting end 33 ensures that after the first elastic element 43 or the second elastic element 44 is fully compressed, the driven element 42 must continue to move before the cutting end 33 can disengage from the outer blade tube 2, thereby causing the inner blade tube 3 to move. The engagement between the cutting end 33 and the outer blade tube 2 balances the elastic forces of the first elastic element 43 and the second elastic element 44, allowing the first elastic element 43 or the second elastic element 44 to remain compressed. This ensures that the movement distance of the driven element 42 is fully converted into the movement distance of the inner blade tube 3, enabling the encoder to obtain an accurate feed distance based on the number of rotations.

[0059] Furthermore, a handheld biopsy device also includes a first limiting member 11, which is installed and fixed on the inner wall of the housing 1. The first limiting member 11 is located on the side of the first stop 31 away from the second stop 32. When the push tube 5 abuts against the first limiting member 11, the cutting end 33 moves to the far end of the sampling groove 21.

[0060] The first limiting member 11 can serve as the starting point. When the inner knife tube 3 is retracting, the encoder uses the first limiting member 11 as the starting point, so that while obtaining the feed distance of the inner knife tube 3, the encoder can also accurately determine the opening and closing size of the sampling slot 21 through the feed distance.

[0061] In one embodiment, see the accompanying drawings. Figure 3 and Figure 4 This embodiment provides a specific structure for a feed unit 4. The push tube 5 is in the shape of a regular polygonal prism, and the driven member 42 has a receiving cavity that matches the push tube 5. Correspondingly, the driving member 41 has a receiving space that matches the driven member 42, so that the driving member 41 is sleeved on the outside of the driven member 42. The driving member 41 includes a threaded section 411 and a blank section 412 that match the driven member 42. The threaded section 411 is located at the distal end of the driving member 41, and the blank section 412 is located at the proximal end of the threaded section 411. The outer side of the driven member 42 is provided with an external thread that mates with the threaded section 411, so that the driving member and the driven member 42 can be threadedly connected. It should be noted that when the push tube 5 abuts against the first limiting member 11, the driven member 42 maintains a threaded connection with the threaded section 411. When the driven member 42 moves toward the proximal end of the housing 1, the driven member 42 is adapted to separate from the threaded section 411 and move into the blank section 412.

[0062] Understandably, when the push tube 5 abuts against the first limiting member 11, the cutting end 33 is located at the far end of the sampling groove 21, and the cutting of the lesion tissue has been completed, requiring retraction. Therefore, during retraction, the driving member 41 rotates continuously, the first elastic member 43 recovers continuously, and the second elastic member 44 is compressed continuously until the second elastic member 44 is fully compressed. Only then can the driving member 41 continue to rotate to drive the inner blade tube 3 to move backward. Before the second elastic member 44 is fully compressed, although the driving member 41 rotates, it will not drive the inner blade tube 3 to move backward. The number of rotations required for the driving member 41 to fully compress the second elastic member 44 is fixed. Therefore, the drive unit can subtract the number of rotations required to fully compress the driving member 41 when the second elastic member 44 is fully compressed from the number of rotations obtained by the encoder to obtain the actual feed distance. When the retraction reaches the point where the driven member 42 disengages from the threaded section 411, that is, when the driven member 42 fully enters the blank section 412. Correspondingly, the second elastic element 44 is in a fully compressed state at this time, serving to abut the follower 42 against the proximal end of the threaded section 411. During feed, the second elastic element 44, in its compressed state, pushes the follower 42 forward to engage with the threaded section 411, thus connecting the follower 42 to the threaded section 411. The compressed second elastic element 44 then begins to recover until the first elastic element 43 is in a fully compressed state. The follower 42 continues to move forward, driving the inner tool tube 3 to feed. Similarly, during this process, the drive unit can subtract the number of rotations of the first elastic element 43 when it fully compresses the drive element 41 from the number of rotations obtained from the encoder to obtain the actual feed distance.

[0063] In one embodiment, see the accompanying drawings. Figure 4 This embodiment further describes the feeding unit 4. A handheld biopsy device also includes a first gear 45 and a second gear 413 fixedly sleeved on the distal end of the active member 41. The first gear 45 is located on the side of the second gear 413 away from the cutting end 33 and is sleeved on the outside of the push tube 5. The second gear 413 and the first gear 45 are adapted to be connected to the drive unit for transmission, so that the drive unit drives the active member 41 to rotate through the second gear 413, thereby pushing the inner blade tube 3 forward or backward. The first gear 45 is fixedly sleeved on the outside of the push tube 5. The drive unit drives the first gear 45 to rotate, which can drive the inner blade tube 3 to rotate, that is, realize the "swinging" of the inner blade tube 3, so as to achieve the purpose of better cutting the lesion tissue.

[0064] In order to realize the transmission connection between the second gear 413 and the drive unit, a notch is provided on one side of the housing 1, and the first gear 45 and the second gear 413 are partially disposed outside the housing 1 through the notch.

[0065] Furthermore, the cutting end 33 is trumpet-shaped, and a notch 34 is provided on the cutting end 33 along the extending direction of the inner blade tube 3. One edge of the notch 34 at its distal end coincides with the side wall of the inner blade tube 3 and is connected to the outside, so as to allow the cutting end 33 to engage with the inner wall of the outer blade tube 2. It can be understood that the cutting end 33 is trumpet-shaped, and when the cutting end 33 is placed inside the inner blade tube 3, the notch 34 is squeezed by the inner wall of the inner blade tube 3, so that the cutting end 34 engages with the inner blade tube 3.

[0066] Furthermore, a second limiting member 14 and an extension 451 are also provided inside the housing 1. The extension 451 is disposed on the side wall of the first gear 45 away from the second gear 413 and is sleeved on the outside of the push tube 5. The rotation of the first gear 45 drives the extension 451 to rotate, thereby causing the inner knife tube 3, which is in the shape of a regular polygonal prism, to rotate. Correspondingly, the second limiting member 14 is disposed on the top wall of the housing 1 and is disposed opposite to the extension 451. The extension 451 rotates under the action of the first gear 45 and is adapted to be limited and engaged with the second limiting member 14 to prevent the notch 34 from rotating to the sampling groove 21.

[0067] Specifically, please refer to the accompanying drawings in the instruction manual. Figure 6 The second limiting member 14 has an arc-shaped groove on the side near the extension 451. The upper end face of the extension 451 abuts against the arc-shaped groove. A locking part 452 is provided on the extension 451. The locking part 452 is located outside the arc-shaped groove and rotates with the extension 451. When the locking part 452 rotates with the extension 451 to abut against both sides of the arc-shaped groove, the first gear 45 cannot continue to rotate, thus limiting the rotation angle of the inner knife tube 3.

[0068] It is understandable that when the first gear 45 drives the push tube 5 to rotate, it drives the inner blade tube 3 to rotate as well. When the cutting end 33 moves to the sampling groove 21, if the notch 34 rotates with the inner blade tube 3 to correspond to the sampling groove 21, the notch 34 will not be squeezed by the inner wall of the inner blade tube 3, which will cause the inner diameter of the cutting end 33 to increase. If the inner blade tube 3 continues to rotate, there is a possibility that the cutting end 33 will collide with the edge of the sampling groove 21, which will lead to blade rolling and affect the cutting effect of the cutting end 33. Therefore, this utility model limits the rotation angle of the inner blade tube 3 by setting the extension part 451 to engage with the second limiting member 14, thus preventing the inner blade tube 3 from rotating excessively and causing blade rolling.

[0069] Preferably, two opposing mounting plates 15 are also provided inside the housing 1, and the first gear 45 and the second gear 413 are both disposed between the two mounting plates 15. In addition, the housing 1 includes a lower half-shell 13 and an upper half-shell 12 covering the lower half-shell 13, a first limiting member 11 and a second limiting member 14 are disposed on the upper half-shell 12, and the two mounting plates 15 are disposed on the lower half-shell 13.

[0070] Accordingly, the drive unit includes a drive element and a control element. The drive element is adapted to be driveably connected to the driving element 42, that is, adapted to be driveably connected to the first gear 45 and the second gear 413. Accordingly, an encoder is disposed on the drive element to obtain the number of rotations of the drive element, that is, to obtain the number of rotations of the driving element 41. The control element is electrically connected to the drive element to control the opening and closing of the drive element and to determine the feed depth of the inner tool tube 3 based on the number of rotations.

[0071] The implementation principle is as follows: After the lesion tissue is cut, the push tube 5 abuts against the first limiting member 11. At this time, the first elastic member 43 is in a fully compressed state. The control element controls the drive member to drive the second gear 413 to rotate. The encoder obtains the number of rotations of the drive member, that is, the number of rotations of the active member 41. After the second elastic member 44 is in a fully compressed state, the second gear 413 continues to rotate to push the inner blade tube 3 to move backward. After the control element removes the number of rotations of the active member 41 after the second elastic member 44 is fully compressed, it obtains the moving distance of the inner blade tube 3. The inner blade tube 3 moves backward continuously, causing the driven member 42 to separate from the threaded section 411 and completely enter the blank section 412. During the cutting process, the second elastic member 44, which is in a compressed state, abuts the driven member 42 against the proximal end of the threaded section 411. The rotation of the second gear 413 causes the driven member 42 to move forward until the first elastic member 43 is in a fully compressed state. Only when the second gear 413 continues to rotate can it drive the inner blade tube 3 to move forward. Accordingly, the control element removes the number of turns of the active member 41 after the first elastic member 43 is fully compressed, and then obtains the moving distance of the inner blade tube 3.

[0072] It should be noted that the above embodiments can be freely combined as needed. The above are merely preferred embodiments of this application. It should be pointed out that for those skilled in the art, several improvements and modifications can be made without departing from the principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A handheld biopsy device, characterized in that, include: case; A puncture assembly, comprising an inner blade tube and an outer blade tube with a sampling groove, wherein the proximal end of the outer blade tube is disposed within the housing, and the distal end of the inner blade tube is movably inserted into the outer blade tube through the proximal end of the outer blade tube. A push tube is disposed inside the housing and sleeved and fixed on the outside of the proximal end of the inner knife tube. A first stop and a second stop are sequentially provided on the outer wall of the push tube in the direction away from the distal end of the inner knife tube. The feeding unit disposed within the housing includes a driving member, and a first elastic member, a driven member, and a second elastic member sequentially connected and sleeved on the outside of the push tube. The distal end of the first elastic member is connected to the first stop, and the proximal end of the second elastic member is connected to the second stop. The driving member is rotatably sleeved on the outside of the driven member to drive the driven member to move. A drive unit is provided to drive the active component to rotate, and the drive unit is equipped with an encoder for obtaining the number of rotations of the active component. The drive unit determines the feed distance of the inner tool tube based on the number of rotations.

2. The handheld biopsy device according to claim 1, characterized in that, The distal end of the inner blade tube is configured as a cutting end, and the cutting end is adapted to engage with the inner wall of the outer blade tube. The driven member is used to compress the first elastic member or the second elastic member. When the first elastic member or the second elastic member is in a fully compressed state, the cutting end moves relative to the outer blade tube under the action of the driven member.

3. A handheld biopsy device according to claim 2, characterized in that, A first limiting member is provided on the inner wall of the housing. The first limiting member is located on the side of the first stop away from the second stop. When the pushing tube abuts against the first limiting member, the cutting end moves to the far end of the sampling groove.

4. A handheld biopsy device according to claim 3, characterized in that, The push tube is in the shape of a regular polygonal prism, and the driven member has a receiving cavity that matches the push tube, so that the driven member can be movably sleeved on the outside of the push tube.

5. A handheld biopsy device according to claim 4, characterized in that, The driving member includes a threaded section and a blank section that match the driven member. The threaded section is disposed at the distal end of the driving member, and the blank section is disposed at the proximal end of the threaded section. The driven member has an external thread on its outer side that mates with the threaded section, so that the driving member and the driven member can be threadedly connected. When the push tube abuts against the first limiting member, the driven member remains threadedly connected to the threaded segment. When the driven member moves away from the first limiting member, the driven member is adapted to separate from the threaded segment and move into the blank segment.

6. A handheld biopsy device according to claim 4 or 5, characterized in that, It also includes a first gear and a second gear fixedly sleeved on the distal end of the driving member. The first gear is located on the side of the second gear away from the cutting end and is sleeved and fixed on the outside of the push tube to drive the inner blade tube to rotate. A notch is provided on one side of the housing, and the first gear and the second gear are partially disposed outside the housing through the notch. The drive unit is adapted to be connected to the first gear and the second gear for transmission.

7. A handheld biopsy device according to claim 6, characterized in that, The cutting end is trumpet-shaped and has a notch groove along the extension direction of the inner blade tube. One edge of the notch groove at the far end coincides with the side wall of the inner blade tube and is connected to the outside, so that the cutting end can be engaged with the inner wall of the outer blade tube.

8. A handheld biopsy device according to claim 7, characterized in that, The housing is also provided with a second limiting member and an extension. The extension is provided on the side wall of the first gear away from the second gear and is sleeved on the outside of the push tube. The second limiting member is disposed on the top wall of the housing and is disposed opposite to the extension. The extension rotates under the action of the first gear and is adapted to be limited and engaged with the second limiting member to prevent the notch from rotating to the sampling groove.

9. A handheld biopsy device according to claim 5, characterized in that, It also includes a power handle detachably mounted on the housing, the drive unit being disposed within the power handle, and the output end of the drive unit extending out from the power handle.

10. A handheld biopsy device according to claim 9, characterized in that, The drive unit includes a drive element and a control element. The drive element is adapted to be connected to the drive element in a transmission manner. The encoder is disposed on the drive element and is used to obtain the number of rotations of the drive element. The control element is electrically connected to the drive component and is used to control the drive component and determine the feed depth of the inner cutter tube based on the number of rotations.

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