Biopsy needle for easy retraction

Abstract

The present invention relates to the technical field of medical instruments, and in particular to a biopsy needle that is easy to withdraw, comprising: an outer knife tube, which is arranged at the front end of a biopsy needle housing; an inner knife tube, which comprises a knife head, and the knife head can move axially along the outer knife tube in the inner cavity of the outer knife tube; a transmission component, which is rotatably arranged in the biopsy needle housing along its own axis and is parallel to the inner knife tube; a push-up component, which is sleeved on the transmission component and can move axially relative to the transmission component, and the push-up component is connected to the inner knife tube and can drive the inner knife tube to move axially; a switching mechanism, which is connected between the push-up component and the transmission component, and is used to make the push-up component and the transmission component engage or disengage in transmission; a first elastic reset component, which is used to drive the push-up component to move and reset along the axial direction of the inner knife tube toward the rear end of the biopsy needle housing. Driven by the push-up component, the inner knife tube quickly retreats and resets backwards.

Description

Technical Field

[0001] The invention relates to the technical field of medical instruments, and in particular to a biopsy needle which is easy to withdraw. Background Art

[0002] A biopsy needle is a medical device used for sampling living tissue and aspirating cells from cone tumors and unknown tumors in various organs such as the kidney, liver, lung, breast, thyroid, prostate, pancreas, testicles, uterus, ovaries, and body surface.

[0003] During a breast biopsy, the biopsy needle draws the patient's lesion tissue into the sampling knife window and then removes it. The removal takes about 3s-5s. When the lesion tissue needs to be removed again, the knife needs to be returned to the original opening point of the sampling knife window and then moved in for removal. If the waiting time for the knife to be withdrawn is too long, the operation time will be prolonged, the doctor's fatigue will be increased, and it will be detrimental to the operation. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a biopsy needle that is easy to retract, so as to solve the problem of long waiting time for retracting the biopsy needle in the prior art.

[0005] In order to achieve the above-mentioned and other related purposes, the present invention provides a biopsy needle that is easy to withdraw, comprising:

[0006] An outer knife tube is arranged at the front end of the biopsy needle housing, and a sampling window is arranged on the outer knife tube;

[0007] The inner knife tube comprises a knife head, and the knife head can move in the inner cavity of the outer knife tube along the axial direction of the outer knife tube;

[0008] A transmission component is rotatably arranged in the biopsy needle housing along its own axis and is parallel to the inner knife tube;

[0009] A push-out component is sleeved on the transmission component and can move axially relative to the transmission component, the push-out component is connected to the inner knife tube and can drive the inner knife tube to move axially;

[0010] A switching mechanism, connected between the ejection component and the transmission component, for making the ejection component and the transmission component engage or disengage in transmission;

[0011] A first elastic reset member is used to drive the push member to move and reset along the axial direction of the inner knife tube toward the rear end of the biopsy needle housing;

[0012] When the inner knife tube advances, the switching mechanism causes the push-up component to engage with the transmission component, and the transmission component rotates and drives the push-up component to move along the axial direction of the inner knife tube toward the front end of the biopsy needle housing;

[0013] When the inner knife tube is retracted, the switching mechanism causes the ejection component to be separated from the transmission component, and the ejection component can slide axially relative to the transmission component. The ejection component drives the inner knife tube to retreat and reset under the action of the first elastic reset member.

[0014] Optionally, the transmission component has a screw segment, and the switching mechanism includes a coupling component arranged on the ejection component, when the coupling component extends into the thread groove of the screw segment, the ejection component is transmission-engaged with the transmission component, and when the coupling component withdraws from the thread groove of the screw segment, the ejection component is transmission-disengaged from the transmission component.

[0015] Optionally, the switching mechanism also includes a second elastic reset member, which can keep the coupling component in a state of exiting the thread groove of the screw segment. When the elastic force of the second elastic reset member is overcome, the coupling component is pressed into the thread of the screw segment.

[0016] Optionally, a connecting hole is provided on the ejection component, the coupling component and the second elastic return component are both installed in the connecting hole, the connecting hole is a stepped hole, the first end of the second elastic return component is arranged on the coupling component, and the second end is stepped against the connecting hole.

[0017] Optionally, the biopsy needle housing is further provided with a movable member for pressing the engaging component, and the movable member can move in a direction approaching and away from the engaging component.

[0018] Optionally, the movable member is arranged along the axial direction of the biopsy needle housing, and the length of the movable member is greater than or equal to the maximum distance that the engaging component can move along the axial direction.

[0019] Optionally, a pressing hole for preventing the movable part from escaping from the biopsy needle housing is provided on the biopsy needle housing along its axial direction, and the pressing hole is a stepped hole, and the movable part abuts against a step of the pressing hole.

[0020] Optionally, an anti-rotation groove is provided on the inner circumference of the biopsy needle housing along the axial direction of the biopsy needle housing, and one end of the ejection component is arranged in the anti-rotation groove to prevent the ejection component from performing circumferential rotational movement around the transmission component.

[0021] Optionally, the screw segment comprises a dense-grooved portion and a sparse-grooved portion sequentially arranged from front to back, and the pitch of the dense-grooved portion is smaller than the pitch of the sparse-grooved portion.

[0022] Optionally, a mounting groove is provided on the coupling component, and a connecting piece is provided on the inner knife tube, and the inner knife tube is driven to move axially by engaging the connecting piece in the mounting groove.

[0023] As described above, the biopsy needle that is easy to withdraw has the following beneficial effects:

[0024] The front end of the biopsy needle housing is provided with an outer knife tube, and the front end of the outer knife tube is provided with a sampling window, and the sampling window is used to suck the tissue to be examined from the sampling window. The inner knife tube is movably arranged in the biopsy needle housing along the front and rear directions of the biopsy needle housing, and can enter and exit the outer knife tube, and the inner knife tube cuts the tissue to be examined sucked from the sampling window and separates it from the whole tissue. The transmission component is arranged in the biopsy needle housing and can rotate along its own axis, and the transmission component is arranged parallel to the inner knife tube. The push-up component is sleeved on the transmission component and can move axially relative to the transmission component. The push-up component is connected to the inner knife tube and drives the inner knife tube to move axially together. The switching mechanism is connected between the push-up component and the transmission component, and the switching mechanism is used for transmission connection or exit transmission connection between the push-up component and the transmission component. The first elastic reset member can drive the inner knife tube to move backward quickly and reset. When the inner knife tube moves forward, the switching mechanism causes the push-up component to engage with the transmission component. At this time, the push-up component and the transmission component are connected to each other, and the rotational motion of the transmission component is converted into the linear motion of the push-up component. The push-up component moves forward with the rotation of the transmission component. Since the push-up component is connected to the inner knife tube and can drive the inner knife tube to move axially together, the inner knife tube can move forward with the push-up component to the sampling window of the outer knife tube to cut the tissue to be inspected. When the inner knife tube moves backward, the switching mechanism causes the transmission separation between the push-up component and the transmission component. At this time, the transmission connection between the push-up component and the transmission component is withdrawn, and the push-up component can move axially relative to the transmission component. When the knife is advanced, the first elastic reset member is compressed forward by the push-up component, and under the elastic force of the first elastic reset member, the push-up component is pushed to retreat and reset backward. Driven by the push-up component, the inner knife tube also retreats and resets backward, realizing the rapid retreat of the inner knife tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of an embodiment of the present invention when the tool is not being fed and the transmission component and the ejection component are in a transmission separation state;

[0026] Figure 2 For the embodiment of the present invention Figure 1 Sectional view at the middle BB;

[0027] Figure 3It is a structural schematic diagram of an embodiment of the present invention when there is no cutting and the transmission component and the ejection component are in a transmission engagement state;

[0028] Figure 4 For the embodiment of the present invention Figure 3 Sectional view at the middle BB;

[0029] Figure 5 It is a structural schematic diagram of an embodiment of the present invention when the tool is retracted and the transmission component and the ejection component are in a transmission engagement state;

[0030] Figure 6 For the embodiment of the present invention Figure 5 A partial enlarged view of point C in the middle;

[0031] Figure 7 It is a structural schematic diagram of an embodiment of the present invention when the tool is retracted and the transmission component and the ejection component are in a transmission separation state;

[0032] Figure 8 For the embodiment of the present invention Figure 7 A partial enlarged view of point D in the middle;

[0033] Fig. 9 It is a schematic diagram of the structure of the ejection component according to an embodiment of the present invention;

[0034] Fig.10 For the embodiment of the present invention Fig. 9 Section view at AA in the middle.

[0035] Part Number Description

[0036] 1-biopsy needle housing; 2-inner blade tube; 3-transmission component; 31-dense groove portion; 32-sparse groove portion; 4-switching mechanism; 41-engaging component; 42-second elastic reset component; 5-pushing component; 51-anti-rotation protrusion; 52-installation groove; 53-connecting hole; 54-anti-rotation groove; 6-first elastic reset component; 7-movable component; 71-pressing hole; 8-connecting component; 9-outer blade tube; 91-sampling window. DETAILED DESCRIPTION

[0037] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0038] It should be noted that the diagram provided in the present embodiment only illustrates the basic concept of the present invention in a schematic manner, so the diagram only shows the components related to the present invention rather than drawing according to the number, shape and size of the components during actual implementation. The type, quantity and ratio of each component during actual implementation can be a random change, and the component layout type may also be more complicated. The structure, ratio, size, etc. illustrated in the drawings of the present specification are only used to match the content disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions that the present invention can implement, so they have no technical substantive significance. Any modification of the structure, change of the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effect that the present invention can produce and the purpose that can be achieved. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of narration, and are not used to limit the scope of the present invention. The change or adjustment of its relative relationship should also be regarded as the scope of the present invention without substantially changing the technical content.

[0039] See also Figures 1 to 10The present embodiment provides a biopsy needle that is easy to retract, including a biopsy needle housing 1, an outer knife tube 9, an inner knife tube 2, a transmission component 3, a push-up component 5, a switching mechanism 4, and a first elastic reset component 6. The inner knife tube 2 includes a knife head, which can move in the inner cavity of the outer knife tube along the axial direction of the outer knife tube 9. The front end of the outer knife tube 9 has a knife tip, and the rear end of the outer knife tube 9 is connected to the front end of the biopsy needle housing 1. The front end of the outer knife tube 9 is provided with a sampling window 91. The inner knife tube 2 is arranged in the biopsy needle housing 1, and can move into the outer knife tube 9 along the axial direction of the biopsy needle housing 1. At the same time, the inner knife tube 2 can rotate along its own axis. The inner knife tube 2 can move axially to the front end of the outer knife tube 9 to cut the sample to be tested sucked at the sampling window 91. After cutting, the inner knife tube 2 retreats and resets to the inner cavity of the biopsy needle housing 1 to prepare for the next cutting. The transmission component 3 can be a transmission screw, and the inner cavity of the biopsy needle housing 1 is provided with a front bracket and a rear bracket for installing the transmission component 3, and the front end and the rear end of the transmission component 3 are respectively installed on the front bracket and the rear bracket. The transmission component 3 is arranged in parallel with the inner knife tube 2, and the transmission component 3 can rotate along its own axis. The push-up component 5 can be a cylindrical structure, and the push-up component 5 is through the front and back along its own axial direction. The push-up component 5 is sleeved on the transmission component 3, and the push-up component 5 can move axially relative to the transmission component 3. The push-up component 5 is connected to the inner knife tube 2, and when the push-up component 5 moves, it can drive the inner knife tube 2 to move axially relative to the transmission component 3. The switching mechanism 4 is arranged between the push-up component 5 and the transmission component 3, which can make the push-up component 5 and the transmission component 3 transmission connected, and make the push-up component 5 and the transmission component 3 in a transmission separation state. The first elastic reset member 6 can be a spring, which is sleeved on the transmission member 3, with the first end abutting against the front end bracket of the inner cavity of the biopsy needle housing 1, and the second end abutting against the front end surface of the push-up member 5, and is used to drive the push-up member 5 to move backward quickly and reset when the inner knife tube 2 is retracted.

[0040] When the inner knife tube 2 advances, the motor drives the transmission component 3 to rotate, and the switching mechanism 4 makes the push-up component 5 and the transmission component 3 connected to each other, converting the rotation of the transmission component 3 into the linear motion of the push-up component 5. The transmission component 3 rotates, causing the push-up component 5 to move forward, and the push-up component 5 presses the first elastic reset member 6 forward. The push-up component 5 drives the inner knife tube 2 connected thereto to move forward, and the blade of the inner knife tube 2 moves axially forward into the outer knife tube 9, passes through the sampling window 91 and moves to the front end of the outer knife tube 9, and cuts the tissue to be inspected sucked at the sampling window 91.

[0041] After the cutting is completed, the inner blade tube 2 is retracted, and the switching mechanism 4 makes the push-up component 5 and the transmission component 3 in a transmission separation state, and the push-up component 5 can move freely along the axial direction of the transmission component 3. At this time, the first elastic reset member 6 is in a squeezed state, and under the action of the elastic force of the first elastic reset member 6, the push-up component 5 is pushed backward, so that the push-up component 5 retreats and resets backward, and drives the inner blade tube 2 connected to the push-up component 5 to retreat and reset backward, so as to achieve the rapid reset of the inner blade tube 2 after cutting.

[0042] In one embodiment, if Figure 1 , Figure 3 , Figure 5 as well as Figure 7 As shown, the transmission component 3 has a screw segment, and a thread groove is arranged on the screw segment. The switching mechanism 4 includes a coupling component 41, and the coupling component 41 is arranged on the ejection component 5. When the top end of the coupling component 41 extends into the thread groove of the screw segment, the ejection component 5 is connected to the transmission component 3 by transmission, and the top end of the coupling component 41 moves in the thread groove of the screw segment through the rotation of the transmission component 3, so that the ejection component 5 moves axially forward, and the inner knife tube 2 is fed.

[0043] When the top end of the engaging component 41 exits the thread groove of the screw segment, the ejecting component 5 and the transmission component 3 are in a transmission separation state, and the ejecting component 5 is free to move axially relative to the transmission component 3 .

[0044] In one embodiment, if Figures 1 to 8 As shown, the switching mechanism 4 further includes a second elastic reset member 42, which can be a spring. The second elastic reset member 42 can keep the coupling member 41 in a state of withdrawing from the thread groove of the screw segment. When the elastic force of the second elastic reset member 42 is overcome and in a compressed state, the coupling member 41 is pressed into the thread of the screw segment by the biopsy needle handle connected to the biopsy needle housing 1. The second elastic reset member 42 can make the coupling member 41 quickly withdraw from the thread groove of the screw segment when the pressure is lost.

[0045] In one embodiment, if Fig. 9 and Fig.10 As shown, the ejection component 5 is a cylindrical structure, and a connection hole 53 is opened in the radial direction of the cylinder wall. The connection hole 53 is a stepped hole. The joint component 41 and the second elastic reset component 42 are both installed in the connection hole 53. The joint component 41 includes a round tube section and an expanded diameter section. The diameter of the round tube section is smaller than the diameter of the expanded diameter section. The second elastic reset component 42 is sleeved on the round tube section of the joint component 41, and the lower end of the second elastic reset component 42 abuts against the outer periphery of the expanded diameter section, and the upper end of the second elastic reset component 42 abuts against the step of the connection hole 53.

[0046] In one embodiment, if Figure 1 , Figure 3 , Figure 5 as well as Figure 7 As shown, a movable member 7 for pressing the coupling component 41 is provided on the bottom of the biopsy needle housing 1. The movable member 7 can move in a direction close to and away from the coupling component 41. An upward force F is applied to the bottom of the movable member 7. The movable member 7 moves upward to approach the coupling component 41, and the top of the movable member 7 presses the bottom of the coupling component 41.

[0047] In one embodiment, if Figure 1 , Figure 3 , Figure 5 as well as Figure 7 As shown, the movable member 7 is arranged along the axial direction of the biopsy needle housing 1, and the length of the movable member 7 is greater than or equal to the maximum distance that the coupling member 41 can move axially, so that when the coupling member 41 moves forward axially, the movable member 7 can always maintain a pressing state against the coupling member 41.

[0048] In one embodiment, if Figure 4 As shown, a pressing hole 71 is axially arranged on the biopsy needle housing 1 for preventing the movable part 7 from escaping from the biopsy needle housing 1. The pressing hole 71 is a long hole. The pressing hole 71 penetrates the biopsy needle housing 1 along the radial direction of the biopsy needle housing 1. The pressing hole 71 is also a stepped hole. The movable part 7 is T-shaped, and the bottoms of the left and right ends of the movable part 7 abut against the steps of the pressing hole 71.

[0049] In one embodiment, an anti-rotation groove 54 is axially provided on the bottom wall of the biopsy needle housing 1 , and one end of the switching mechanism 4 is disposed in the anti-rotation groove 54 to prevent it from performing circumferential rotational motion around the transmission component 3 .

[0050] In one embodiment, if Figure 4 , Fig. 9 and Fig.10 As shown, an anti-rotation protrusion 51 is provided on the bottom of the ejection component 5 to prevent the ejection component 5 from rotating along its own axis, and an anti-rotation groove 54 is axially provided on the bottom wall of the biopsy needle housing 1, and the anti-rotation protrusion is movably arranged in the anti-rotation groove 54 along the axial direction of the biopsy needle housing 1.

[0051] Furthermore, the connection hole 53 for mounting the coupling component 41 is arranged on the anti-rotation protrusion 51, and an anti-rotation groove 54 is axially opened on the bottom wall of the biopsy needle housing 1. The anti-rotation protrusion 51 and one end of the switching mechanism are both movably arranged in the anti-rotation groove 54 along the axial direction of the biopsy needle housing 1, which can prevent the anti-rotation protrusion 51 from rotating along its own axis.

[0052] In one embodiment, if Figure 1 , Figure 3 , Figure 5 as well as Figure 7As shown, the screw segment includes a dense groove portion 31 and a sparse groove portion 32 arranged in sequence from front to back, and the pitch of the dense groove portion 31 is smaller than the pitch of the sparse groove portion 32. When the coupling component 41 is located in the thread groove of the sparse groove portion 32, the pitch of the sparse groove portion 32 is larger and the travel speed is faster, so the travel speed of the inner knife tube 2 moving axially along the transmission component 3 is faster. When the coupling component 41 is located in the thread groove of the dense groove portion 31, the pitch of the sparse groove portion 32 is smaller and the travel speed is slower, so the travel speed of the inner knife tube 2 moving axially along the transmission component 3 is slower. When the inner knife tube 2 does not need to cut tissue, the travel speed of the inner knife tube 2 can be accelerated by a large pitch. When the inner knife tube 2 enters the sampling window 91 of the outer knife tube 9 and is ready to cut tissue, the travel speed needs to be reduced.

[0053] In one embodiment, if Figure 6 , Figure 8 as well as Fig.10 As shown, a mounting groove 52 is provided on the top of the coupling component 41, and a connecting member 8 is provided on the rear end of the inner knife tube 2. The bottom of the connecting member 8 fits in the mounting groove 52, so that the coupling component 41 drives the inner knife tube 2 to move axially together.

[0054] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A biopsy needle that is easy to withdraw, characterized in that: include: An outer knife tube is arranged at the front end of the biopsy needle housing, and a sampling window is arranged on the outer knife tube; The inner knife tube comprises a knife head, and the knife head can move in the inner cavity of the outer knife tube along the axial direction of the outer knife tube; A transmission component is rotatably arranged in the biopsy needle housing along its own axis and is parallel to the inner knife tube; A push-out component is sleeved on the transmission component and can move axially relative to the transmission component, the push-out component is connected to the inner knife tube and can drive the inner knife tube to move axially; A switching mechanism, connected between the ejection component and the transmission component, for making the ejection component and the transmission component engage or disengage in transmission; A first elastic reset member is used to drive the push member to move and reset along the axial direction of the inner knife tube toward the rear end of the biopsy needle housing; When the inner knife tube advances, the switching mechanism causes the push-up component to engage with the transmission component, and the transmission component rotates and drives the push-up component to move along the axial direction of the inner knife tube toward the front end of the biopsy needle housing; When the inner knife tube is retracted, the switching mechanism causes the ejection component to be separated from the transmission component, and the ejection component can slide axially relative to the transmission component. The ejection component drives the inner knife tube to retreat and reset under the action of the first elastic reset member.

2. The biopsy needle for easy retraction according to claim 1, characterized in that: The transmission component has a screw segment, and the switching mechanism includes a coupling component arranged on the ejection component. When the coupling component extends into the thread groove of the screw segment, the ejection component is transmission-engaged with the transmission component, and when the coupling component withdraws from the thread groove of the screw segment, the ejection component is transmission-disengaged with the transmission component.

3. The biopsy needle for easy retraction according to claim 2, characterized in that: The switching mechanism also includes a second elastic reset member, which can keep the coupling component in a state of exiting the thread groove of the screw segment. When the elastic force of the second elastic reset member is overcome, the coupling component is pressed into the thread of the screw segment.

4. The biopsy needle for easy retraction according to claim 3, characterized in that: The ejection component is provided with a connection hole, the coupling component and the second elastic return component are both installed in the connection hole, the connection hole is a stepped hole, the first end of the second elastic return component is arranged on the coupling component, and the second end is against the step of the connection hole.

5. The biopsy needle for easy retraction according to any one of claims 3 or 4, characterized in that: The biopsy needle housing is also provided with a movable member for pressing the engaging component, and the movable member can move in a direction approaching and away from the engaging component.

6. The biopsy needle for easy retraction according to claim 5, characterized in that: The movable member is arranged along the axial direction of the biopsy needle housing, and the length of the movable member is greater than or equal to the maximum distance that the engaging component can move along the axial direction.

7. The biopsy needle for easy retraction according to claim 5, characterized in that: A pressing hole for preventing the movable part from falling out of the biopsy needle housing is arranged along the axial direction of the biopsy needle housing. The pressing hole is a stepped hole, and the movable part abuts against the step of the pressing hole.

8. The biopsy needle for easy retraction according to any one of claims 2 to 4, characterized in that: An anti-rotation groove is provided on the inner circumference of the biopsy needle housing along the axial direction of the biopsy needle housing, and one end of the ejection component is arranged in the anti-rotation groove to prevent the ejection component from performing circumferential rotational movement around the transmission component.

9. The biopsy needle for easy retraction according to any one of claims 2 to 4, characterized in that: The screw segment comprises a dense-grooved portion and a sparse-grooved portion which are sequentially arranged from front to back, and the pitch of the dense-grooved portion is smaller than the pitch of the sparse-grooved portion.

10. The biopsy needle for easy retraction according to any one of claims 2 to 4, characterized in that: The joint component is provided with a mounting groove, and the inner knife tube is provided with a connecting piece. The inner knife tube is driven to move axially by fitting the connecting piece into the mounting groove.

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