A soft tissue tumor puncture biopsy needle device

Abstract

The present invention discloses a soft tissue tumor puncture biopsy needle device, including a needle tube, a needle handle and a driving unit. A cylinder cavity is provided inside the needle handle; the proximal end of the needle tube is connected to the needle handle and the internal channel of the needle tube is connected to the cylinder cavity; a piston is slidably connected in the cylinder cavity, a driving structure is installed on the needle handle, and the output end of the driving unit is connected to the piston, which is used to drive the piston to slide in the cylinder cavity; an exhaust port connected to the outside is also provided on the cylinder cavity, and a one-way valve that only allows gas to flow from the cylinder cavity to the outside is provided on the exhaust port. The soft tissue tumor puncture biopsy needle device provided by the present invention can continuously draw the target object into the internal channel of the needle tube without the need for multiple punctures, and at the same time, it is not necessary to leave a safe distance like a cutting needle.

Description

Technical Field

[0001] The invention belongs to the technical field of medical devices, and in particular relates to a soft tissue tumor puncture biopsy needle device. Background Art

[0002] Currently, in clinical practice, the treatment of various tumors throughout the body must rely on pathological diagnosis. The puncture biopsy technique is a technique in which a clinician uses a puncture needle to puncture the skin to the tumor site to obtain relevant pathological tissue. It is currently the least invasive technique in clinical practice that can obtain tissue for pathological diagnosis. The puncture biopsy needle is a necessary medical device for this technology. Its main function is to puncture tumor tissue, obtain tumor tissue, and store tumor tissue for a short time.

[0003] In order to ensure the correctness and effectiveness of pathological diagnosis, sufficient tissue samples must be obtained. At the same time, since this technology is operated on the human body, absolute safety must be guaranteed. Therefore, extremely high requirements are placed on the inner diameter and range of action of the puncture needle. Existing biopsy needles have two sampling methods: suction and cutting. The main body mainly includes a needle body and a handle. The biopsy needle that extracts samples by vacuum adsorption (generally called a suction needle) generally has a needle body structure that includes a hollow needle tube and an inner core. The biopsy needle that extracts samples by cutting (generally called a cutting needle) generally has a hollow needle tube with a grooved blade inside. The tissue is obtained by forward cutting, and the forward distance is generally designed to be 1.5 to 2.5 cm. The handle mainly includes some mechanical and control structures to provide mechanical force during biopsy sampling.

[0004] During the sampling process of the suction needle by vacuum adsorption, a small amount of air will always enter the hollow needle tube, affecting the vacuum degree of the needle detection system, resulting in less soft tissue entering the biopsy needle during a single puncture, and multiple punctures are required to obtain a sufficient amount of tissue; but multiple punctures may lead to two adverse consequences. One is that multiple punctures are likely to deviate from the tumor tissue and lead to failure of pathological diagnosis. The other is that it is easy to destroy the integrity of the tumor and cause tumor spread.

[0005] When the cutting needle rushes forward to obtain tissue, this rushing process is completed by a constant mechanical force, which is completely out of the operator's control. Therefore, it is easy to damage the tissue behind the tumor. This requires leaving a sufficient safety distance (at least 1.5 cm). If the safety distance is not enough, it is easy to damage various blood vessels, leading to complications such as pseudoaneurysms. In the most serious cases, it may cause the death of the patient. Therefore, its use is limited for some patients. At the same time, due to the cutting design, the front 0.5 cm of the cutting needle cannot obtain pathological tissue and is an invalid distance. In addition, when the needle rushes forward, it is easy to push the tumor tissue into the normal tissue, causing the tumor to spread. Summary of the invention

[0006] In view of the above problems, the present invention provides a soft tissue tumor puncture biopsy needle device, comprising a needle tube, a needle handle and a driving unit, wherein a cylinder cavity is provided inside the needle handle; the proximal end of the needle tube is connected to the needle handle and the internal channel of the needle tube is connected to the cylinder cavity; a piston is slidably connected in the cylinder cavity, the driving structure is installed on the needle handle, and the output end of the driving unit is connected to the piston for driving the piston to slide in the cylinder cavity; the cylinder cavity is also provided with an exhaust port connected to the outside world, and a one-way valve is provided on the exhaust port for only allowing gas to flow from the cylinder cavity to the outside world.

[0007] In a certain embodiment of the soft tissue tumor puncture biopsy needle device, the inner channel of the needle tube is a sampling channel;

[0008] A blocking structure is provided in the sampling channel and is arranged close to the distal end. The blocking structure is used to prevent the target object in the sampling channel from being pushed out from the distal outlet of the sampling channel by gas pressure.

[0009] In a certain embodiment of the soft tissue tumor puncture biopsy needle device, the blocking structure is a protrusion provided on the inner wall of the sampling channel.

[0010] In a certain embodiment of the soft tissue tumor puncture biopsy needle device, the protrusion is an annular barb-shaped protrusion provided on the inner wall of the sampling channel, and the blocking structure includes a plurality of the annular barb-shaped protrusions arranged at intervals along the axial direction of the sampling channel.

[0011] In a soft tissue tumor puncture biopsy needle device in a certain embodiment, the protrusion has a guiding surface and a blocking surface; the surface on the protrusion facing the distal direction is the guiding surface, and the guiding surface is arranged toward the distal direction and toward the radial inner side of the sampling channel; the surface on the protrusion facing the proximal direction is the blocking surface, and the blocking surface is arranged toward the proximal direction and toward the radial outer side of the sampling channel, or the blocking surface is arranged toward the proximal direction and perpendicular to the axis of the sampling channel.

[0012] In a certain embodiment of the soft tissue tumor puncture biopsy needle device, the driving part is an electric control part, and the electric control part is provided with a foot switch outside, and the opening and closing of the electric control part is controlled by the foot switch.

[0013] In a certain embodiment of the soft tissue tumor puncture biopsy needle device, the driving unit includes:

[0014] A push rod, the push rod is slidably connected to the needle handle, and the distal end of the push rod is connected to the proximal end of the piston;

[0015] A driving mechanism is installed on the needle handle, and an output end of the driving mechanism is connected to the proximal end of the push rod, and is used to drive the push rod to slide so as to drive the piston to slide in the cylinder cavity.

[0016] In a certain embodiment of a soft tissue tumor puncture biopsy needle device, the driving mechanism includes a driving unit, a screw and a nut, the driving unit is installed on the needle handle, the output end of the driving unit is connected to the screw and is used to drive the screw to rotate; the nut is sleeved on the screw and threadedly connected to the screw; the push rod has an axial hole, and the end of the screw that is not connected to the driving unit extends into the axial hole, and the nut is movably connected to the push rod so that the nut drives the push rod to slide when it moves along the screw driven by the rotation of the screw.

[0017] In a certain embodiment of the soft tissue tumor puncture biopsy needle device, the needle handle has a sliding channel inside, and the push rod is slidably connected to the sliding channel;

[0018] The push rod is rotationally connected to the screw rod through a bearing, the bearing is located in the sliding channel, the outer ring of the bearing is slidingly connected to the sliding channel, and the outer ring of the bearing is fixedly connected to the push rod, the inner ring of the bearing is sleeved outside the screw rod, and the inner ring of the bearing is also fixedly connected to the nut.

[0019] In a certain embodiment of the soft tissue tumor puncture biopsy needle device, the needle tube and the needle handle are detachably connected, and a sealing structure is provided at the connection to prevent air leakage at the connection between the internal channel of the needle tube and the cylinder cavity.

[0020] Due to the adoption of the above technical solution, the present invention has the following advantages and positive effects compared with the prior art:

[0021] The present invention uses vacuum adsorption to sample the target object. When in use, the distal end of the needle tube is aligned with the target object, and the drive unit drives the piston to move in the proximal direction to generate negative pressure in the cylinder cavity, thereby sucking the target object into the internal channel of the needle tube; the drive unit can drive the piston to reciprocate, and when the drive unit drives the piston to move in the distal direction, the gas in the cylinder cavity will be discharged from the one-way valve, and when the drive unit drives the piston to move in the proximal direction again, it can continue to suck the target object into the internal channel of the needle tube. Therefore, the soft tissue tumor puncture biopsy needle device provided by the present invention can continuously suck the target object into the internal channel of the needle tube without the need for multiple punctures, and at the same time, it is not necessary to leave a safe distance like a cutting needle. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the following detailed description of the preferred embodiment.The drawings are only for the purpose of illustrating the preferred embodiments and are not to be construed as limiting the invention.

[0023] Figure 1 It is a structural schematic diagram of a soft tissue tumor puncture biopsy needle device of the present invention;

[0024] Figure 2 The figure is a schematic diagram of the internal structure of a soft tissue tumor puncture biopsy needle device at the driving part of the present invention.

[0025] Description of reference numerals:

[0026] 1: needle handle; 2: needle tube; 3: blocking structure; 4: one-way valve; 5: connecting seat; 6: piston; 7: driving part; 8: power interface; 9: control board; 10: screw; 11: nut; 12: bearing; 13: reducer; 14: motor; 15: push rod column: 16: push rod head. DETAILED DESCRIPTION

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0028] In order to simplify the drawings, only the parts related to the present invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "one" not only means "only one", but also means "more than one".

[0029] There are currently two main technical types of puncture needles for obtaining tissue pathology, cutting biopsy needles (generally referred to as cutting needles) and suction biopsy needles (generally referred to as suction needles). Theoretically, the insertion depth of the suction biopsy needle is completely controlled by the operator, which is safer and more reliable. However, due to the insufficient negative pressure in the needle tube, the tissue cannot enter the needle tube well, so it cannot be compared with the cutting biopsy needle in terms of sampling volume; and the cutting biopsy needle needs to rush forward to penetrate the tissue, and has high requirements for the safety distance, and its application is limited in some smaller lesion biopsies. Studies have shown that the use of a vacuum environment assist in the needle tube can increase the sampling length of the biopsy needle. The vacuum environment in the needle tube will exert suction on the target object, promoting the target object to enter the internal channel of the needle tube. The greater the negative pressure, the greater the sampling volume. This embodiment designs a soft tissue tumor puncture biopsy needle device based on vacuum environment assisted technology that can obtain a large number of target objects without multiple punctures.

[0030] See also Figure 1 and Figure 2 The soft tissue tumor puncture biopsy needle device provided in this embodiment includes a needle tube 2, a needle handle 1 and a driving unit 7. A cylinder cavity is provided inside the needle handle 1; the proximal end of the needle tube 2 is connected to the needle handle 1 and the internal channel of the needle tube 2 is connected to the cylinder cavity; a piston 6 is slidably connected in the cylinder cavity, the driving structure is installed on the needle handle 1, and the output end of the driving unit 7 is connected to the piston 6, which is used to drive the piston 6 to slide in the cylinder cavity; the cylinder cavity is also provided with an exhaust port connected to the outside, and a one-way valve 4 is provided on the exhaust port to only allow gas to flow from the cylinder cavity to the outside.

[0031] The soft tissue tumor puncture biopsy needle device provided in this embodiment is mainly used to obtain tumor pathological tissue inside the human body, so the target corresponds mainly to tumor pathological tissue; of course, the present invention is not limited to being used only for obtaining tumor pathological tissue inside the human body, and in other embodiments, it can also be used to obtain other soft tissues in the human body or soft tissues in other organisms. Among them, the proximal end refers to the end relatively close to the operator (generally a doctor), and the distal end refers to the end relatively far away from the operator.

[0032] In the soft tissue tumor puncture biopsy needle device provided in this embodiment, the internal channel of the needle tube 2 is used to store the target object, and the target object is sucked into the internal channel of the needle tube 2 from the distal opening of the internal channel of the needle tube 2. When in use, the driving unit 7 drives the piston 6 to move in the proximal direction, so that negative pressure is produced in the cylinder cavity, thereby sucking the target object into the internal channel of the needle tube 2. If the acquired target objects are sufficient, the soft tissue tumor puncture biopsy needle device of this embodiment can be withdrawn from the human body; when the acquired target objects are insufficient, the driving unit 7 drives the piston 6 to return (that is, move in the distal direction), the gas in the cylinder cavity is discharged from the one-way valve 4, and then the piston 6 is driven to move in the proximal direction to continue to acquire the target object. By driving the piston 6 to move repeatedly, enough target objects can be acquired in one puncture.

[0033] The soft tissue tumor puncture biopsy needle device of this embodiment is further described below.

[0034] For ease of description, the inner channel of the needle tube 2 is referred to as a sampling channel. Preferably, a blocking structure 3 is provided in the sampling channel, and the blocking structure 3 is provided close to the distal direction. The blocking structure 3 is used to prevent the target object in the sampling channel from being pushed out from the distal outlet of the sampling channel by the gas pressure. The blocking structure 3 can be a protrusion provided on the inner side wall of the sampling channel.

[0035] Furthermore, the protrusion has a guiding surface and a blocking surface. The surface on the protrusion facing the distal direction is the guiding surface, and the guiding surface is arranged in the distal direction and in the radial inner side of the sampling channel. The surface on the protrusion facing the proximal direction is the blocking surface, and the blocking surface is arranged in the proximal direction and in the radial outer side of the sampling channel, or the blocking surface is arranged in the proximal direction and perpendicular to the axis of the sampling channel. The setting of the guiding surface is conducive to the target object being sucked into the proximal direction of the protrusion, and the setting of the blocking surface can prevent the target object located in the proximal direction of the protrusion from being pushed toward the distal direction of the protrusion by air pressure. Therefore, the cooperation between the guiding surface and the group surface can better acquire the target object and prevent the target object from leaving after acquiring the target object.

[0036] More preferably, the protrusion may be an annular barb-shaped protrusion disposed on the inner side wall of the sampling channel, and the blocking structure 3 includes a plurality of annular barb-shaped protrusions spaced apart along the axial direction of the sampling channel. Figure 1The cross-sectional shape of the annular barb-shaped protrusion on the radial plane of the sampling channel is a triangle formed by the straight line formed by the guide surface, the straight line formed by the blocking surface, and the straight line formed by the inner wall of the sampling channel. In this embodiment, the blocking structure 3 includes three annular barb-shaped protrusions, the distance between the annular barb-shaped protrusion closest to the needle handle 1 and the farthest end of the needle tube 2 is about 2 mm, and the spacing distance between two adjacent annular barb-shaped protrusions is about 0.5 mm; the inclination angle between the guide surface of the annular barb-shaped protrusion and the inner wall of the sampling channel is about 60°, and the difference between the diameter of the connection between the guide surface and the blocking surface on the annular barb-shaped protrusion and the diameter of the inner wall of the sampling channel is about 0.2 mm; of course, the specific structure of the above blocking structure 3 is only a preferred solution provided in this embodiment, and in other embodiments, it can also be adjusted according to actual conditions.

[0037] The blocking structure 3 formed by the three annular barb-like protrusions in this embodiment can better ensure that the target object stays in the sampling channel, preventing it from being pushed out of the sampling channel by air pressure when the piston 6 moves toward the distal direction, and at the same time ensures that the target object will not be lost when the soft tissue tumor puncture biopsy needle of this embodiment is withdrawn from the human body.

[0038] The piston 6 is preferably made of rubber to ensure the sealing performance of the piston 6 when sliding in the cylinder cavity.

[0039] The needle of the needle tube 2 (that is, the distal end portion of the needle tube 2) can preferably be a Franseen needle.

[0040] In this embodiment, the driving unit 7 is preferably electrically controlled, that is, the driving unit 7 is preferably an electrically controlled unit; of course, in other embodiments, the driving unit 7 may also be powered by manpower, such as manually pushing and pulling a push rod fixedly connected to the proximal end of the piston 6 to drive the sliding of the piston 6.

[0041] In this embodiment, a foot switch is provided outside the electric control unit, and the electric control unit is turned on and off by the foot switch. The provision of the foot switch can facilitate single-handed operation of the soft tissue tumor puncture biopsy needle device of this embodiment, ensuring stability during operation.

[0042] The driving unit 7 includes a push rod and a driving mechanism. The push rod is slidably connected to the needle handle 1, and the distal end of the push rod is connected to the proximal end of the piston 6. The driving mechanism is installed on the needle handle 1, and the output end of the driving mechanism is connected to the proximal end of the push rod, which is used to drive the push rod to slide so as to drive the piston 6 to slide in the cylinder cavity. The main function of the driving unit 7 is to drive the piston 6 to slide back and forth in the cylinder cavity so that negative pressure can be continuously generated in the cylinder cavity. In this embodiment, the driving unit 7 drives the push rod to move back and forth through the driving mechanism to drive the piston 6 to slide back and forth in the cylinder cavity. Of course, in other embodiments, the driving unit 7 can also use magnetic force or other structures that can generate push-pull forces to drive the piston 6 to slide back and forth. The specific structure of the driving unit 7 is not limited by the present invention.

[0043] Specifically in this embodiment, the driving mechanism includes a driving unit, a screw 10 and a nut 11. The driving unit is installed on the needle handle 1, and the output end of the driving unit is connected to the screw 10 and is used to drive the screw 10 to rotate; the nut 11 is sleeved on the screw 10 and threadedly connected to the screw 10; the push rod has an axial hole, and the end of the screw 10 that is not connected to the driving unit extends into the axial hole. The nut 11 is movably connected to the push rod so that the nut 11 drives the push rod to slide when it moves along the screw 10 driven by the rotation of the screw 10.

[0044] More specifically, a mounting cavity is provided in the needle handle 1, and the driving unit includes a control board 9, a motor 14 and a reducer 13. The control board 9, the motor 14 and the reducer 13 are all installed in the mounting cavity, and the control board 9 is connected to the motor 14 signal to control the action of the motor 14; the output shaft of the motor 14 is connected to the input end of the reducer 13, and the output end of the reducer 13 is connected to the screw 10. The forward and reverse rotation of the output shaft of the motor 14 is decelerated by the reducer 13 and drives the push rod forward and reverse. Among them, the reducer 13 can be a ready-made reducer directly, or a homemade reducer formed by the cooperation of multiple gears, which is not limited here.

[0045] The needle handle 1 has a sliding channel inside, and the push rod is slidably connected in the sliding channel. One end of the push rod connected to the reducer 13 extends from the sliding channel and then extends into the installation cavity to connect to the reducer 13. The push rod is rotatably connected to the screw 10 through the bearing 12. Specifically, the bearing 12 is located in the sliding channel, and the outer ring of the bearing 12 is slidably connected to the sliding channel. The outer ring of the bearing 12 is also fixedly connected to the push rod. In this way, when the bearing 12 slides in the sliding channel, it can drive the push rod to slide synchronously in the sliding channel; the inner ring of the bearing 12 is fixedly connected to the nut 11, and the inner ring of the bearing 12 is sleeved outside the screw 10, but because the screw 10 is provided with an external thread, the inner ring of the bearing 12 is not in direct contact with the screw 10 (in addition, due to the existence of the external thread on the screw 10, although the screw 10 extends into the axial hole of the push rod, it is also not in direct contact). When the screw rod 10 rotates under the drive of the reducer 13, since the nut 11 is sleeved on the screw rod 10 and threadedly connected thereto, and the outer ring of the bearing 12 fixedly connected to the nut 11 can only slide in the sliding channel, the self-rotation of the screw rod 10 will drive the bearing 12 to slide in the sliding channel, thereby driving the push rod fixedly connected to the outer ring of the bearing 12 to slide in the sliding channel, and the sliding of the push rod drives the piston 6 to slide in the cylinder cavity. Preferably, the push rod in this embodiment includes a push rod column 15 and a push rod head 16, the push rod column 15 has an axial hole set through, which is the axial hole of the push rod, the screw rod 10 extends from the proximal opening of the axial hole of the push rod column 15 into the axial hole of the push rod column 15, and a part of the push rod head 16 is inserted into the axial hole of the push rod column 15 from the distal opening of the axial hole of the push rod column 15 and fixedly connected thereto, and the distal end of the push rod head 16 is fixedly connected to the piston.

[0046] Preferably, the soft tissue tumor puncture biopsy needle device provided in this embodiment includes two pedal switches, the two pedal switches are respectively connected to the control board 9 by signal, and the two pedal switches are respectively used to control the forward and reverse rotation of the motor 14 through the control board 9. That is, by stepping on one of the pedal switches to start the forward rotation of the motor 14, when the stepping stops, the motor 14 does not rotate; by stepping on the other pedal switch, the motor 14 is started to reverse, when the stepping stops, the motor 14 does not rotate. Further, the control board 9 is provided with an anti-misstepping function, that is, when both pedal switches are stepped on, the motor 14 does not rotate.

[0047] Furthermore, for the safety of the push rod driven by the motor 14 to slide, a limit function is set, and the limit function is to control the motor 14 to stop when the push rod moves to the extreme position toward the far end or moves to the extreme position toward the near end. In this embodiment, the control is performed by the control board 9, specifically, the position of the push rod sliding can be inferred according to the number of circles rotated by the motor 14, so the maximum number of circles of the forward and reverse rotation of the motor 14 is controlled to prevent the push rod from sliding beyond the extreme position. Of course, in other embodiments, other methods can also be used to implement the limit function, such as setting a sensor at the extreme position of the push rod sliding, etc., which is not limited here.

[0048] A power interface 8 may be provided on the outer wall of the needle handle 1. The power interface 8 is used to connect to an external power source and provide external power to various components that need to be powered by electricity in this embodiment. As for how the power interface 8 is electrically connected to various components that need to be powered by electricity, this embodiment does not limit it. Of course, in other embodiments, the power interface 8 may also be replaced by a plug with a cable, or directly powered by a battery, etc. The present invention does not limit how to power the electrical components in the soft tissue tumor puncture biopsy needle device.

[0049] Furthermore, the needle tube 2 and the needle handle 1 are detachably connected, and a sealing structure is provided at the connection to prevent leakage of the inner channel of the needle tube 2 and the cylinder cavity at the connection. The present invention does not limit the detachable connection method and sealing method of the needle tube 2 and the needle handle 1.

[0050] In this embodiment, a connection seat 5 is provided at the proximal end of the needle tube 2. The connection seat 5 has a connection groove facing the proximal direction, and an internal thread is provided on the inner side wall of the connection groove. A connection protrusion is provided on the distal surface of the needle handle 1, and an external thread is provided on the outer side wall of the connection protrusion. The internal thread of the connection groove and the external thread on the connection protrusion are threadedly connected, so that the connection seat 5 can be detachably connected to the connection protrusion. The proximal opening of the sampling channel is provided on the bottom surface of the connection groove; a channel is provided on the connection protrusion, the proximal end of the channel is connected to the cylinder cavity, and the distal opening of the channel is provided on the end surface of the connection protrusion facing the distal direction; when the connection seat 5 is connected to the connection protrusion in place, the channel is connected to the sampling channel. Furthermore, a sealing gasket is sleeved on the connecting protrusion. When the connecting seat 5 is connected to the connecting protrusion in place, the sealing gasket is located between the distal surface of the needle handle 1 and the proximal surface of the connecting seat 5. The proximal surface of the connecting seat 5 is pressed against the distal surface of the needle handle 1 through the sealing gasket, so that the connection between the channel on the connecting protrusion and the sampling channel is sealed and leak-proof.

[0051] The soft tissue tumor puncture biopsy needle device provided in this embodiment is electrically driven and can continuously generate negative pressure in the cylinder cavity (in the prior art, as the target object enters the sampling channel, the vacuum degree will gradually decrease), so that the sampling channel in the needle tube 2 can generate continuous negative pressure and ensure the vacuum degree, so a single puncture can obtain enough target objects (that is, pathological tissues), reducing the number of punctures and reducing the probability of tumor implantation and metastasis. In the soft tissue tumor puncture biopsy needle device provided in this embodiment, the control device is a foot switch, which can be operated by a single person to ensure stability during operation. At the same time, the soft tissue tumor puncture biopsy needle device provided in this embodiment adopts the negative pressure absorption principle, which is to suck the target object into the sampling channel of the needle tube 2 to obtain it, so the forward and backward movement of the needle (that is, the distal part of the needle tube 2) are controlled by the operator, and its safety is greatly improved. The space in the sampling channel in the needle tube 2 is an effective sampling area, and there is no cutting needle structure in the sampling channel, so the extraction amount of the target object is greatly increased.

[0052] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, if these changes fall within the scope of the claims of the present invention and their equivalents, they still fall within the protection scope of the present invention.

Claims

1. A soft tissue tumor puncture biopsy needle device, characterized in that: It comprises a needle tube, a needle handle and a driving part, wherein a cylinder cavity is arranged inside the needle handle; the proximal end of the needle tube is connected to the needle handle and the internal passage of the needle tube is communicated with the cylinder cavity; a piston is slidably connected in the cylinder cavity, the driving structure is mounted on the needle handle, and the output end of the driving part is connected with the piston to drive the piston to slide in the cylinder cavity; the cylinder cavity is also provided with an exhaust port communicated with the outside, and a one-way valve is arranged on the exhaust port to only allow gas to flow from the cylinder cavity to the outside; The inner channel of the needle tube is a sampling channel; a blocking structure is provided in the sampling channel, and the blocking structure is arranged close to the distal end, and the blocking structure is used to prevent the target object in the sampling channel from being pushed out from the distal outlet of the sampling channel by the gas pressure; The blocking structure is a protrusion provided on the inner side wall of the sampling channel; The protrusion has a guiding surface and a blocking surface; the surface on the protrusion facing the distal direction is the guiding surface, and the guiding surface is arranged toward the distal direction and toward the radial inner side of the sampling channel; the surface on the protrusion facing the proximal direction is the blocking surface, and the blocking surface is arranged toward the proximal direction and toward the radial outer side of the sampling channel, or the blocking surface is arranged toward the proximal direction and perpendicular to the axis of the sampling channel.

2. The soft tissue tumor puncture biopsy needle device according to claim 1, characterized in that: The protrusion is an annular barb-shaped protrusion arranged on the inner side wall of the sampling channel, and the blocking structure includes a plurality of the annular barb-shaped protrusions arranged at intervals along the axial direction of the sampling channel.

3. The soft tissue tumor puncture biopsy needle device according to claim 1, characterized in that: The driving part is an electric control part, and a foot switch is provided outside the electric control part, and the opening and closing of the electric control part is controlled by the foot switch.

4. The soft tissue tumor puncture biopsy needle device according to claim 1 or 3, characterized in that: The driving unit comprises: A push rod, the push rod is slidably connected to the needle handle, and the distal end of the push rod is connected to the proximal end of the piston; A driving mechanism is installed on the needle handle, and an output end of the driving mechanism is connected to the proximal end of the push rod, and is used to drive the push rod to slide so as to drive the piston to slide in the cylinder cavity.

5. The soft tissue tumor puncture biopsy needle device according to claim 4, characterized in that: The driving mechanism includes a driving unit, a screw and a nut. The driving unit is installed on the needle handle, and the output end of the driving unit is connected to the screw and is used to drive the screw to rotate. The nut is sleeved on the screw and threadedly connected to the screw. The push rod has an axial hole, and the end of the screw that is not connected to the driving unit extends into the axial hole. The nut is movably connected to the push rod so that the nut drives the push rod to slide when it moves along the screw driven by the rotation of the screw.

6. The soft tissue tumor puncture biopsy needle device according to claim 5, characterized in that: The needle handle has a sliding channel inside, and the push rod is slidably connected in the sliding channel; The push rod is rotationally connected to the screw rod through a bearing, the bearing is located in the sliding channel, the outer ring of the bearing is slidingly connected to the sliding channel, and the outer ring of the bearing is fixedly connected to the push rod, the inner ring of the bearing is sleeved outside the screw rod, and the inner ring of the bearing is also fixedly connected to the nut.

7. The soft tissue tumor puncture biopsy needle device according to claim 1, characterized in that: The needle tube and the needle handle are detachably connected, and a sealing structure is provided at the connection to prevent air leakage at the connection between the inner channel of the needle tube and the cylinder cavity.

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