Pen-holding type electric rotating solid tumor cytology needle biopsy device

Abstract

The utility model provides a pen-holding type electric rotating solid tumor cytology needle biopsy device. A puncture device comprises a shell, a rotating / front-back telescopic module, a negative pressure module and a puncture needle, wherein the rotating / front-back telescopic module and the negative pressure module are installed in the shell, and the puncture needle is installed at the end of the shell. The rotating / front-back telescopic module comprises a first driving motor, a driving gear, a driven gear, a first end cam and a second end cam, the first end cam and the second end cam can relatively rotate and axially reset, the first driving motor drives the driven gear to rotate, the driving gear is in meshing transmission with the driven gear, and the driven gear is coaxially and slidably connected with the first end cam. The tail portion of the first end face cam is detachably connected with the puncture needle. According to the puncture device, the pulling and inserting actions and the puncture distance in the puncture process can be accurately controlled, automatic or controllable negative pressure is achieved, the experience dependence of the puncture technology of an operator is remarkably reduced, the learning curve of the operator is effectively shortened, the effective rate of sample taking is improved, and the probability of complications possibly generated in the puncture process can be remarkably reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of solid tumor cytology puncture biopsy, especially relates to a pen-holding type electric rotary solid tumor cytology puncture biopsy device with negative pressure function. BACKGROUND

[0002] Solid tumor is a common tumor in clinic. Therefore, accurately judging the nature of thyroid nodule is particularly important, which can not only reduce unnecessary surgical treatment and medical expenses, but also reduce the risk of complications caused by over-treatment.

[0003] Cytological biopsy is an important method for preoperative diagnosis, especially fine needle aspiration biopsy (FNAB) of thyroid is the "gold standard" for preoperative diagnosis, which has been included in the diagnosis and treatment guidelines for thyroid nodule and thyroid cancer at home and abroad. The specific operation of FNAB is to place the needle tip around or in the nodule under the guidance of ultrasound, repeatedly pull and insert the needle at different angles to obtain a small amount of cell components, and then perform cytological smear, and judge the benign and malignant of thyroid nodule according to the pathological result. FNAB is divided into non-negative pressure and negative pressure two ways, the main difference between the two is the operation method. The operation method of non-negative pressure fine needle aspiration is to directly suck the cell sample through the capillary siphon effect of the fine needle after the needle core is pulled out, which can effectively reduce bleeding and reduce the damage of puncture to thyroid tissue. However, for some nodules with high hardness, such as fibrosis nodules, the capillary siphon effect of non-negative pressure fine needle aspiration is weak, so negative pressure fine needle aspiration method is needed. The operation method of negative pressure fine needle aspiration is to connect a syringe barrel to the tail of the puncture needle after the needle core is pulled out, and the operator repeatedly pulls and inserts the fine needle under negative pressure, and releases the negative pressure when pulling out the needle. This method can collect more cells, and the positive rate of pathological diagnosis is also higher.

[0004] In the puncture biopsy operation, the doctor needs to "hold the ultrasound with the left hand and hold the puncture needle with the right hand", and finds out the target point position and the best puncture point of the skin according to the ultrasound image and the actual operation experience, and then manually punctures. However, in clinical practice, it is more difficult to control the negative pressure by pulling the syringe core rod with the right hand, and the clinical experience of the doctor is required. At the same time, in clinical practice, some tough nodules are easy to move in the same direction with the needle during puncture, which will reduce the success rate of sampling. UTILITY MODEL CONTENTS

[0005] Therefore, the utility model is committed to designing a new pen-holding type electric rotary solid tumor cytology puncture biopsy device, which innovatively integrates the forward and reverse rotation, forward and backward extension functions of the puncture needle and the automatic negative pressure or controllable negative pressure function, so as to improve the operability and sampling success rate of the puncture device.

[0006] In order to achieve the above purpose, the technical scheme of the utility model is as follows:

[0007] A pen-holding type electric rotary solid tumor cytological puncture biopsy device comprises a puncture needle, a shell, and a rotation / forward and backward telescopic module and a negative pressure module installed inside the shell, and the puncture needle is installed at the end of the shell;

[0008] The rotation / forward and backward telescopic module comprises a first driving motor, a driving gear, a driven gear, and a first end face cam and a second end face cam that can rotate relatively and reset axially, the first driving motor drives the driven gear to rotate, the driving gear is in mesh transmission with the driven gear, the driven gear is coaxially and slidingly connected with the first end face cam, and the tail of the first end face cam is detachably connected with the puncture needle.

[0009] The negative pressure module comprises a syringe and a driving assembly for driving the reciprocating motion of the plunger of the syringe, and the syringe is communicated with the puncture needle through the liquid channel arranged inside the second end face cam and the liquid channel arranged inside the first end face cam in sequence.

[0010] Further, the head of the first end face cam and the head of the second end face cam are respectively provided with a recess and a protrusion, and the recess and the protrusion of the first end face cam are alternately contacted with the recess and the protrusion of the second end face cam during the rotation process to realize the forward and backward reciprocating motion of the puncture needle.

[0011] Further, a reset spring is installed between the driven gear and the first end face cam, and a sealing ring is arranged between the first end face cam and the second end face cam.

[0012] Further, two guide keys are arranged on the first end face cam, and two long key grooves matched with the guide keys are arranged on the corresponding position of the driven gear.

[0013] Further, a tapered hole is arranged on the tail end face of the second end face cam, and the liquid outlet of the syringe is installed in the tapered hole.

[0014] Further, the first bearing and the second bearing are installed on the driven gear in interference fit, and the outer rings of the first bearing and the second bearing are installed in the shell in interference fit.

[0015] Further, the driving assembly comprises a second driving motor, a ball screw, a ball screw nut, and a push block, the ball screw is connected with the output shaft of the second driving motor, the ball screw nut is installed on the ball screw, the push block is connected with the ball screw nut, and the push block is connected with the plunger of the syringe to drive the reciprocating linear motion of the plunger of the syringe.

[0016] Further, the two ends of the ball screw are respectively provided with third and fourth bearings, the inner rings of the third and fourth bearings are fitted on the ends of the ball screw in an interference fit, and the outer rings of the third and fourth bearings are fitted on the shell in an interference fit.

[0017] Further, the driving assembly comprises a rotating roller and a displacement support rod which are engaged with each other, the rotating roller extends out of the surface of the shell, one end of the displacement support rod is connected with the plunger of the syringe, and rotating the rotating roller drives the displacement support rod to slide and drives the plunger of the syringe to perform a reciprocating linear motion.

[0018] Further, the puncture device further comprises a control module and a power module, the control module is electrically connected with the power module, the first driving motor is electrically connected with the control module, and a self-resetting button is arranged on the shell and electrically connected with the control module for controlling the first driving motor.

[0019] The second driving motor is electrically connected with the control module and the power module.

[0020] Further, the second driving motor is electrically connected with the control module, and a gear adjusting sliding switch is arranged on the shell and electrically connected with the control module for controlling the second driving motor.

[0021] Further, the second end face cam is fixed in the shell through two positioning blocks arranged on the side face.

[0022] Further, the first driving motor and the second driving motor are both fixed in the shell.

[0023] Further, the outer rings of the first and second bearings are both fitted in the shell in an interference fit.

[0024] Compared with the prior art, the utility model has the following advantages:

[0025] (1) The puncture needle of the pen-holding type electric rotary solid tumor cytology puncture biopsy device has the functions of rotating in opposite directions and stretching and retracting in the front and back directions, the traditional manual lifting and cutting mode is changed into a cutting mode of coupling of rotary in opposite directions and stretching and retracting in the front and back directions under the driving of the motor, the lifting and cutting action, the puncture distance in the puncture process are ensured, automatic or controllable negative pressure is realized, the experience dependence of the operator on the puncture technology is remarkably reduced, the learning curve of the operator is effectively shortened, the efficiency of specimen taking is improved, and the probability of complications in the puncture process can be remarkably reduced.

[0026] (2)The pen-holding type electric rotary solid tumor cytological puncture biopsy device has the built-in automatic or controllable negative pressure module for suction, can more effectively collect cell tissues, greatly improves the sample acquisition success rate, improves the puncture efficiency, avoids multiple punctures, reduces the burden of doctors and patients, and reduces the incidence of needle channel tumor implantation caused by multiple manual lifting and inserting. Meanwhile, compared with manually pulling the core rod, the automatic or controllable negative pressure module is more convenient and accurate, and the size of the negative pressure can be controlled by using the gear adjustment sliding switch or the rotating roller, and the design of multiple gears in the gear adjustment sliding switch and the rotating roller can meet the use requirements of different situations.

[0027] (3)The shell of the pen-holding type electric rotary solid tumor cytological puncture biopsy device adopts a streamline design in line with ergonomics, has good hand-holding stability, and is not prone to shaking during puncture and suction. BRIEF DESCRIPTION OF DRAWINGS

[0028] The accompanying drawings, which form a part of this description, are included to provide a further understanding of the application. The embodiments of the application and its features are described with the drawings serving as a guide instead of improperly limiting the application. In the drawings:

[0029] Figure 1 is a schematic diagram of the overall appearance of embodiment 1 Figure 1 ;

[0030] Figure 2 is a schematic diagram of the overall appearance of embodiment 1 Figure 2 ;

[0031] Figure 3 is a schematic diagram of the shell of embodiment 1

[0032] Figure 4 is a schematic diagram of the overall structure of embodiment 1

[0033] Figure 5 is a schematic diagram of the rotation / forward and backward telescopic module of embodiment 1

[0034] Figure 6 is a sectional view of the rotation / forward and backward telescopic module of embodiment 1

[0035] Figure 7 is a schematic diagram of the end face cam mechanism motion principle in the rotation / forward and backward telescopic module of embodiment 1

[0036] Figure 8 is a schematic diagram of the negative pressure module of embodiment 1

[0037] Figure 9 is a schematic diagram of the overall appearance of embodiment 2

[0038] Figure 10is a cross-sectional view of the puncture device of Example 2.

[0039] BRIEF DESCRIPTION OF DRAWINGS

[0040] 1, housing; 2, rotation / forward-rearward telescopic module; 3, automatic negative pressure module; 4, puncture needle; 5, self-resetting button; 6, gear adjustment sliding switch; 7, left housing; 8, right housing; 9, first driving motor; 10, driving gear; 11, driven gear; 12, first bearing; 13, second bearing; 14, first end face cam; 15, second end face cam; 16, conversion joint; 17, second driving motor; 18, syringe; 19, ball screw; 20, ball screw nut; 21, third bearing; 22, fourth bearing; 23, push block; 24, spring; 25, sealing ring; 26, dial roller; 27, displacement support rod. DETAILED DESCRIPTION

[0041] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0042] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" and the like are only for the purpose of description and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" and the like can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified and limited, the term "a plurality of" means two or more.

[0043] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0044] The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0045] Embodiment 1

[0046] With reference Figures 1-8 The utility model provides a kind of pen-holding type electric rotary solid tumor cytology puncture biopsy device, specific structure includes shell 1, rotation / forward and backward telescopic module 2, negative pressure module 3, puncture needle 4, self-resetting button 5, gear adjusting sliding switch 6, control module (not shown in drawing), power module (not shown in drawing).

[0047] With reference Figures 1-4 Shell 1 includes left shell 7 and right shell 8, and left shell 7 and right shell 8 are connected by self-tapping screw.The shell 1 adopts the streamline design in line with ergonomics, such as being provided with the ergonomic recess (not shown in drawing) for placing finger on shell 1, so that hand holding stability is good, and it is not easy to appear to shake in the process of puncture, suction, and it is beneficial to the comfort of user operation.

[0048] Left shell 7 and right shell are provided with boss clamping groove. The inside of shell 1 is installation cavity, and rotation / forward and backward telescopic module 2 and negative pressure module 3 are installed in the installation cavity, gear adjusting sliding switch 6 is installed in the boss clamping groove of left shell 7, and is fixed on the outer surface of left shell 7 by screw connection, and self-resetting button 5 is installed in the boss clamping groove of right shell 8, and is fixed on the outer surface of right shell 8 in the form of bolt connection.

[0049] With reference Figures 4-6 Rotation / forward and backward telescopic module 2 includes first drive motor 9, driving gear 10, driven gear 11, first bearing 12, second bearing 13, first end face cam 14, second end face cam 15, conversion joint 16, spring 24, sealing ring 25. First drive motor 9 is fixed by horse saddle clamp and shell 1. The D-shaped output shaft of first drive motor 9 is connected with the D-shaped hole of driving gear 10 by interference fit, and driving gear 10 is engaged with driven gear 11 to transmit power. The inner rings of first bearing 12 and second bearing 13 are installed on driven gear 11 by interference fit, and the outer rings of first bearing 12 and second bearing 13 are installed on shell 1 by interference fit, so as to improve the coaxiality of driven gear 11 rotation.

[0050] It needs to be specifically explained that two guide keys (not shown in drawing) are arranged on first end face cam 14, and two long key grooves (not shown in drawing) are arranged on the corresponding position of driven gear 11, and first end face cam 14 is connected with driven gear 11 by sliding. The long key groove of driven gear 11 makes first end face cam 14 realize radial and circumferential positioning and fixing, to ensure that first end face cam 14 can rotate with driven gear 11, and at the same time, the axial freedom degree of first end face cam 14 is not limited, so it can still move back and forth along the axial direction of driven gear 11.

[0051] With reference Figure 4 AndFigure 5 The second end face cam 15 is directly fixed on the shell 1 through two positioning blocks on the side. Figure 6 and Figure 7 Since the driven gear 11 can drive the first end face cam 14 to rotate, and the second end face cam 15 is directly fixed on the shell 1, the head of the first end face cam 14 and the head of the second end face cam 15 are respectively provided with a recess and a protrusion, and the recess and the protrusion of the first end face cam 14 alternately contact the recess and the protrusion of the second end face cam 15 in the rotating process, so that the first end face cam 14 and the second end face cam 15 appear misalignment and alignment. When misalignment occurs, the puncture needle 4 moves forward; when alignment occurs, the puncture needle 4 moves backward, and finally the forward and backward reciprocating rotating movement of the puncture needle 4 is realized. Due to the different resistances of the soft tissues contacted by the puncture needle 4 as a whole, the forward and backward rotation will cause the soft tissues around the puncture needle 4 to be knotted, and then the needle tip and the needle tail are decentered, and finally the puncture needle 4 cannot be pulled out. The same direction rotation of the puncture needle 4 of the utility model can avoid the above problems, in addition, the forward and backward stretching action of the motor control rotating / forward and backward stretching module is relatively large, which can effectively avoid the synchronous movement of the puncture needle 4 and the tissues around it, improve the cutting effect, and improve the efficiency of suction.

[0052] Specifically, when the driven gear 11 drives the first end face cam 14 to rotate, the recess of the first end face cam 14 and the protrusion of the second end face cam 15, and the protrusion of the first end face cam 14 and the recess of the second end face cam 15 are fitted under the action of the spring 24, the first end face cam 51 and the second end face cam 52 are in close contact, at this time the puncture needle 4 moves backward, the driven gear 11 drives the first end face cam 14 to continue to rotate, and the first end face cam 14 will rotate to the protrusion thereof contacting the protrusion of the second end face cam 52, at this time the puncture needle 4 moves forward.

[0053] In order to ensure the sealing of the device, as shown in Figure 6 The driven gear 11 is a sealed sleeve and gear integrated structure. The spring 24 is installed between the driven gear 11 and the first end face cam 14, so that the first end face cam 14 is reset each time misalignment occurs. The sealing ring 25 is installed between the first end face cam 14 and the second end face cam 15 to ensure that the liquid does not leak out and the sealing property.

[0054] The first end face cam 14 is detachably connected with the conversion joint 16 through ordinary threads, and the conversion joint 16 is detachably connected with the puncture needle 4 through luer threads. The tail of the second end face cam 15 is provided with a tapered hole, which is connected with the negative pressure module 3 through interference fit.

[0055] The axial hollow of the first end face cam 14 and the second end face cam 15 is a liquid channel, and the syringe 18 is communicated with the puncture needle 4 through the liquid channel arranged inside the first end face cam 14 and the second end face cam 15 in sequence. During the biopsy puncture process, under the action of the negative pressure module 3, the liquid passes through the liquid channel of the puncture needle 4, the first end face cam 14 and the second end face cam 15 in sequence and enters the syringe 18 to successfully suck the cell specimen.

[0056] With reference to Figure 8 The negative pressure module 3 comprises a second driving motor 17, a syringe 18 and a driving assembly for driving the reciprocating motion of the plunger rod of the syringe, and the driving assembly comprises a ball screw 19, a ball screw nut 20, a third bearing 21, a fourth bearing 22 and a push block 23. The second driving motor 17 is fixed to the shell 1 through a set screw. The ball screw 19 is provided with a D-shaped hole connected with the D-shaped output shaft of the second driving motor 17, the inner rings of the third bearing 21 and the fourth bearing 22 are installed on the ball screw 19 in interference fit, and the outer rings of the third bearing 21 and the fourth bearing 22 are installed on the shell 1 in interference fit, so as to ensure the normal operation of the ball screw 19. The ball screw nut 20 is installed on the ball screw 19, the rotation of the ball screw 19 drives the movement of the ball screw nut 20, and the shell 1 is provided with a track to ensure the linear motion of the ball screw nut 20. The push block 23 is connected with the ball screw nut 20 through bolts, and the circular baffle at the end of the plunger rod of the syringe 18 is arranged between the protruding arm provided on the push block 23 and the semicircular baffle, so that the push block 23 drives the plunger rod of the syringe 18 to move linearly and reciprocally. The front end of the syringe 18 is connected with the second end face cam 15 in the rotary-fore-aft telescopic module 2 through interference fit.

[0057] The first driving motor 9 is electrically connected with the control module and the power module through cables, the self-resetting button 5 installed on the shell 1 is electrically connected with the control module to control the first driving motor 9, thereby achieving the control of the rotation / fore-aft telescopic function of the puncture needle 4. The second driving motor 17 is electrically connected with the control module and the power module through cables, and the gear adjusting sliding switch 6 installed on the shell 1 is electrically connected with the control module to control the second driving motor 17, thereby controlling the negative pressure module.

[0058] In use, the power module is first turned on to supply power to the puncture device, the puncture needle 4 is placed around or in the nodule, the self-resetting button 5 is pressed to start the rotary-fore-aft telescopic module 2, and the gear adjusting sliding switch 6 is started at the lowest gear to pull out the plunger rod of the syringe to generate a certain negative pressure in the syringe. At this time, the puncture needle 4 rotates in the same direction while telescoping forward and backward to suck the cell specimen. If some nodules with higher hardness are encountered, the gear of the gear adjusting sliding switch 6 can be adjusted to increase the negative pressure in the syringe until enough cell specimen is sucked. Then the self-resetting button 5 and the gear adjusting sliding switch 6 are turned off, and the puncture needle 4 is pulled out to complete the puncture biopsy operation.

[0059] Embodiment 2

[0060] Reference Figures 9-10 The difference from Embodiment 1 is that:

[0061] The negative pressure module is composed of a syringe and a driving assembly for driving the reciprocating movement of the plunger rod of the syringe 18, wherein the driving assembly is composed of a poking roller 26 extending out of the surface of the shell 1 and a displacement support rod 27, one end of the displacement support rod 27 is connected with the plunger rod of the syringe 18, and rotating the poking roller 26 drives the displacement support rod 27 to slide and in turn drives the plunger rod of the syringe 18 to reciprocate linearly. A structure for preventing the automatic reset of the wobble roller during use is also arranged in the driving assembly, which is a known technology in the art and will not be described here.

[0062] In use, first, the power module is turned on to provide power for the puncture device, the puncture needle 4 is placed around or in the nodule, the self-resetting button 5 is pressed to start the rotating / forward and backward telescoping module 2, and at the same time, the poking roller 26 is rotated by a certain angle to make the displacement support rod drive the plunger rod of the syringe to be pulled out, thereby generating a certain negative pressure in the syringe. The puncture needle 4 rotates in the same direction while being telescoped forward and backward to suck the cell specimen. If some nodules with higher hardness are encountered, the angle of the poking roller 26 can be further rotated to increase the negative pressure in the syringe until enough cell specimens are sucked. The self-resetting button 5 is turned off, and the puncture needle 4 is pulled out to complete the puncture biopsy operation.

[0063] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A pen-held electrically powered rotary solid tumor cytopathic biopsy device characterized by: The puncture biopsy device comprises a shell (1), a rotation / forward and backward telescopic module (2) and a negative pressure module (3) installed inside the shell (1), and a puncture needle (4) installed at the end of the shell (1). The rotation / forward and backward telescopic module (2) comprises a first driving motor (9), a driving gear (10), a driven gear (11), and a first end face cam (14) and a second end face cam (15) capable of relative rotation and axial reset, the first driving motor (9) drives the driven gear (11) to rotate, the driving gear (10) is in mesh transmission with the driven gear (11), the driven gear (11) is coaxially and slidingly connected with the first end face cam (14), and the tail of the first end face cam (14) is detachably connected with the puncture needle (4). The negative pressure module (3) comprises a syringe (18) and a driving assembly for driving the reciprocating motion of the plunger of the syringe (18), the syringe (18) is communicated with the puncture needle (4) through the liquid passages arranged inside the second end face cam (15) and the liquid passages arranged inside the first end face cam (14) in sequence.

2. The pen-held, electrically powered, rotary, solid tumor cytopathology biopsy device of claim 1 wherein: The head of the first end face cam (14) and the head of the second end face cam (15) are respectively provided with recesses and protrusions, and the recesses and protrusions of the first end face cam (14) are alternately contacted with the recesses and protrusions of the second end face cam (15) during the rotation to realize the forward and backward reciprocating motion of the puncture needle (4).

3. The pen-held, electrically powered, rotary, solid tumor cytopathology biopsy device of claim 1 wherein: The reset spring (24) is installed between the driven gear (11) and the first end face cam (14), and the sealing ring (25) is arranged between the first end face cam (14) and the second end face cam (15).

4. The pen-held, electrically powered, rotary, solid tumor cytopathology biopsy device of claim 1 wherein: Two guide keys are arranged on the first end face cam (14), and two long key grooves matched with the guide keys are arranged on the corresponding positions of the driven gear (11).

5. The pen-held, electrically powered, rotary, solid tumor cytopathology biopsy device of claim 1 wherein: The tail end face of the second end face cam (15) is provided with a tapered hole, and the liquid outlet of the syringe (18) is installed in the tapered hole.

6. The pen-held, electrically powered, rotary, solid tumor cytopathology biopsy device of claim 1 wherein: The first bearing (12) and the second bearing (13) are interference-fitted on the driven gear (11), and the outer rings of the first bearing (12) and the second bearing (13) are interference-fitted in the shell (1).

7. The pen-held, electrically powered, rotary, solid tumor cytopathology biopsy device of claim 1 wherein: The driving assembly comprises a second driving motor (17), a ball screw (19), a ball screw nut (20), and a push block (23), the ball screw (19) is connected with the output shaft of the second driving motor (17), the ball screw nut (20) is installed on the ball screw (19), the push block (23) is connected with the ball screw nut (20), the push block (23) is connected with the plunger of the syringe (18) to drive the reciprocating linear motion of the plunger of the syringe (18), the third bearing (21) and the fourth bearing (22) are respectively installed at the two ends of the ball screw (19), the inner rings of the third bearing (21) and the fourth bearing (22) are interference-fitted at the ends of the ball screw (19), and the outer rings of the third bearing (21) and the fourth bearing (22) are interference-fitted on the shell (1).

8. The pen-held, electrically powered, rotary, solid tumor cytopathology biopsy device of claim 1 wherein: The driving assembly comprises a rotating knob (26) and a displacement support rod (27) which are engaged with each other, the rotating knob (26) extends out of the surface of the shell (1), one end of the displacement support rod (27) is connected with the plunger rod of the syringe (18), rotating the rotating knob (26) drives the displacement support rod (27) to slide and in turn drives the plunger rod of the syringe (18) to reciprocate linearly.

9. The pen-held, electrically powered, rotary, solid tumor cytopathology biopsy device of claim 7, wherein: The puncture biopsy device further comprises a control module and a power module, the control module and the power module are electrically connected, the first driving motor (9) is electrically connected with the control module, a self-resetting button (5) is arranged on the shell (1), and the self-resetting button (5) is electrically connected with the control module and is used for controlling the first driving motor (9).

10. The pen-held, electrically powered, rotary, solid tumor cytopathology biopsy device according to claim 9, wherein: The second driving motor (17) is electrically connected with the control module, a gear adjusting sliding switch (6) is arranged on the shell (1), the gear adjusting sliding switch (6) is electrically connected with the control module and is used for controlling the second driving motor (17).

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