A minimally invasive visualized biopsy device for precise sampling of a periprosthetic joint infection

Abstract

The application relates to the technical field, in particular to a minimally invasive visual biopsy device for precise sampling of joint prosthesis periprosthetic infection, which is used for solving the problem of poor treatment effect of existing devices in response to sampling tissue blockage; the device comprises a sampling mechanism, a negative pressure extraction mechanism and a pressure control mechanism; the sampling mechanism comprises a handle, a cannula connected to the handle and a drill rod rotationally connected in the cannula; the negative pressure extraction mechanism comprises an extraction pipe, one end of the extraction pipe is communicated with the cannula and the other end is communicated with a collection tank; a medical silica gel layer is attached to the inner wall of the cannula, an annular memory metal is installed in the medical silica gel layer, when the cannula is blocked, the negative pressure intensity in the collection tank is increased, and the annular memory metal is heated and deformed to increase the inner diameter of the cannula; the device can increase the inner diameter of the sampling pipe and the sampling negative pressure when the sampling is blocked, so as to relieve the sampling blockage.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to a minimally invasive visual biopsy device for precise sampling of periprosthetic joint infection. BACKGROUND

[0002] Periprosthetic joint replacement is an important means of treating end-stage joint disease, which can effectively restore joint function and improve the quality of life of patients. However, periprosthetic joint infection (PJI) is one of the most serious complications after surgery, with an incidence of only 1%~3%, but a high rate of disability and great difficulty in treatment. If the diagnosis is delayed or not handled properly, it may lead to loosening of the prosthesis, osteolysis, and even the need for multiple surgical revisions, causing great physical pain and economic burden to patients.

[0003] Precise diagnosis is the premise of treating PJI, and pathological examination of infected tissue and pathogen culture are the "gold standard" for diagnosis. Therefore, how to obtain sufficient and qualified infected tissue samples around the prosthesis directly affects the accuracy of diagnosis and the effectiveness of subsequent treatment. Currently, the commonly used sampling methods in clinical practice mainly include aspiration and open biopsy: aspiration through percutaneous puncture to extract joint fluid or a small amount of tissue debris, although it is a minimally invasive procedure, but has obvious limitations: on the one hand, the sampling amount is small and easily contaminated by surrounding normal tissue, especially when the infection focus is limited or a sinus tract is formed, it is difficult to accurately capture the tissue in the core area of the infection, resulting in a high false negative rate (up to 15%~30%); on the other hand, if the puncture process encounters fibrous scar, bone fragments or hard infected granulation tissue, it is easy to cause blockage of the sampling channel, not only unable to obtain effective samples, but also may increase the risk of tissue damage and infection spread due to repeated puncture.

[0004] Open biopsy exposes the tissue around the prosthesis by surgical incision, which can directly obtain larger pieces of diseased tissue, and has relatively high sampling accuracy, but it is traumatic, slow in postoperative recovery, and may disrupt the soft tissue balance around the prosthesis, increasing the difficulty of secondary surgery. For elderly patients with multiple underlying diseases, the surgical risk of open biopsy is significantly increased, and its clinical application is limited to some extent.

[0005] In addition, the existing minimally invasive sampling devices lack effective adaptive adjustment capability when dealing with tissue blockage. When the sampling channel is blocked by a large piece of tissue or viscous exudate, simply relying on increased negative pressure may cause excessive traction damage to the local tissue, or the normal tissue around the sampling channel may be accidentally sucked due to the concentration of negative pressure, further reducing the purity of the sample. At the same time, the sampling process of traditional devices lacks visual guidance, relying on the experience of the operator to determine the sampling position, which makes it difficult to ensure that the sample comes from the area with the highest infection activity, affecting the accuracy of diagnosis. SUMMARY

[0006] The application provides a minimally invasive visual biopsy device for precise sampling of joint prosthesis periprosthetic infection to solve the problem of poor treatment effect of existing devices in dealing with blocked sampling tissue.

[0007] To alleviate the above technical problems, the technical scheme provided by the application is as follows:

[0008] A minimally invasive visual biopsy device for precise sampling of joint prosthesis periprosthetic infection comprises a sampling mechanism, a negative pressure extraction mechanism and a pressure control mechanism.

[0009] The sampling mechanism comprises a handle, a cannula connected to the handle and a drill rod rotationally connected to the cannula.

[0010] The negative pressure extraction mechanism comprises an extraction pipe, one end of which is in communication with the cannula and the other end of which is in communication with a collection tank.

[0011] The inner wall of the cannula is attached with a medical silica gel layer, and an annular memory metal is installed in the medical silica gel layer; when the cannula is blocked, the negative pressure intensity in the collection tank is increased, and the annular memory metal is heated and deformed to increase the inner diameter of the cannula.

[0012] Further, the negative pressure extraction mechanism further comprises a cylinder cover, which is threadedly connected to the collection tank, and the extraction pipe penetrates through the cylinder cover and is in communication with the collection tank.

[0013] Further, the negative pressure extraction mechanism further comprises a vacuum pump, and an air extraction pipe is installed on the vacuum pump, penetrates through the cylinder cover and is in communication with the collection tank.

[0014] Further, the pressure control mechanism comprises a detection pipe in communication with the air extraction pipe, and a passive air cylinder is in communication with the detection pipe; the output end of the passive air cylinder is connected with a first sliding switch and a second sliding switch; when the extraction pipe is blocked, the negative pressure intensity in the detection pipe is increased, so that the passive air cylinder is shortened, the first sliding switch and the second sliding switch are both slid and control the increase of the rotation speed of the vacuum pump and the heating and deformation of the annular memory metal, respectively.

[0015] Further, a piston plate is slidably connected in the detection pipe, the lower surface of the piston plate is fixedly connected with a cylindrical rod, the inner wall of the detection pipe is provided with a convex ring, the cylindrical rod is attached to the inner wall of the convex ring, a first spring is connected between the piston plate and the convex ring, a first pipeline is connected between the detection pipe and the passive air cylinder, and a throttle valve is arranged on the first pipeline.

[0016] Further, the output end of the passive air cylinder is fixedly connected with a rectangular plate, two rectangular through holes are formed in the rectangular plate, threaded rods are fixedly connected with the sliding pieces of the first sliding switch and the second sliding switch, the threaded rods are slidably connected with the through holes, and nuts are threadedly connected with the threaded rods, so that the rectangular plate can drive the sliding pieces to move synchronously when the nuts are locked.

[0017] Further, the sampling mechanism further comprises a small motor fixedly connected to the handle, and the drill rod is fixedly connected to the output end of the small motor.

[0018] Further, the pulse mechanism further comprises a small hydraulic rod fixedly connected to the outer wall of the extraction pipe, and the circular plate is fixedly connected to the output end of the small hydraulic rod.

[0019] Further, the pulse mechanism further comprises a small hydraulic rod fixedly connected to the outer wall of the extraction pipe, and the circular plate is fixedly connected to the output end of the small hydraulic rod.

[0020] Further, the pulse mechanism further comprises a small hydraulic rod fixedly connected to the outer wall of the extraction pipe, and the circular plate is fixedly connected to the output end of the small hydraulic rod.

[0021] The beneficial effects of the present application are as follows:

[0022] A minimally invasive visual biopsy device for precise sampling of periprosthetic joint infection, comprising a sampling mechanism, a negative pressure extraction mechanism and a pressure control mechanism; the sampling mechanism comprises a handle, a cannula connected to the handle, and a drill rod rotatably connected to the cannula; the negative pressure extraction mechanism comprises an extraction pipe, one end of the extraction pipe is communicated with the cannula, and the other end is communicated with a collection tank; a medical silica gel layer is attached to the inner wall of the cannula, and an annular memory metal is installed in the medical silica gel layer; when the cannula is blocked, the negative pressure intensity in the collection tank increases, and the annular memory metal is heated and deformed to increase the inner diameter of the cannula.

[0023] The working channel is made by percutaneous puncture, so that the cannula is inserted into the position to be sampled, the drill rod in the cannula is controlled to rotate, the end of the drill rod is provided with a rotary cutter, the rotary cutter cuts the lesion position, the negative pressure in the collection tank is transmitted through the suction pipe and the cannula, so that the tissue cut by the rotary cutter is sucked into the collection tank, if the tissue blocks the plug, the negative pressure strength in the collection tank will increase, at this time, the pressure control mechanism controls the heating of the annular memory metal, so that the annular memory metal expands under the heat, the medical silica gel layer deforms, so that the inner diameter of the cannula expands, and the negative pressure strength in the collection tank increases, so that the large piece of tissue can be sucked away. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the specific embodiments or related art, the drawings needed to be used in the specific embodiments or related art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0025] Figure 1 It is a structural schematic diagram of the whole application;

[0026] Figure 2 It is a structural schematic diagram of the small motor of the application;

[0027] Figure 3 It is a structural schematic diagram of the collection tank of the application;

[0028] Figure 4 It is a structural schematic diagram of the pressure control mechanism of the application;

[0029] Figure 5 It is a structural schematic diagram of the round plate of the application;

[0030] Figure 6 It is a structural schematic diagram of the electromagnetic ring of the application.

[0031] Icon:

[0032] 100, sampling mechanism; 110, handle; 120, cannula; 130, small motor; 131, drill rod; 140, extraction tube; 200, negative pressure extraction mechanism; 210, cylinder cover; 220, collection tank; 230, vacuum pump; 240, air extraction tube; 300, pressure control mechanism; 310, detection tube; 320, cylindrical rod; 321, piston plate; 322, first spring; 330, first pipeline; 331, throttle valve; 340, passive air cylinder; 341, rectangular plate; 350, first sliding switch; 360, second sliding switch; 370, threaded rod; 371, nut; 400, pulse mechanism; 410, electromagnetic ring; 420, arc-shaped piston rod; 430, arc-shaped piston cylinder; 440, second spring; 450, second pipeline; 460, small hydraulic rod; 470, cylinder body; 480, circular plate. DETAILED DESCRIPTION

[0033] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0034] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0035] In the description of the present application, it should be noted that unless otherwise explicitly 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; it can be the communication inside 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.

[0036] Embodiments, such as Figures 1-6As shown, a minimally invasive visual biopsy device for precise sampling of joint prosthesis periprosthetic infection comprises a sampling mechanism 100, a negative pressure extraction mechanism 200 and a pressure control mechanism 300; the sampling mechanism 100 comprises a handle 110, a cannula 120 connected to the handle 110, and a drill rod 131 rotatably connected in the cannula 120; the negative pressure extraction mechanism 200 comprises an extraction tube 140, one end of the extraction tube 140 being communicated with the cannula 120 and the other end being communicated with a collection tank 220; a medical silica gel layer is attached to the inner wall of the cannula 120, and an annular memory metal is installed in the medical silica gel layer; when the cannula 120 is blocked, the negative pressure intensity in the collection tank 220 increases, and the annular memory metal is heated to deform to increase the inner diameter of the cannula 120.

[0037] The working mechanism of the biopsy device provided in the embodiment is as follows:

[0038] A working channel is made by percutaneous puncture, the cannula 120 is inserted into the position to be sampled, the drill rod 131 in the cannula 120 is rotated, the end of the drill rod 131 is provided with a rotary cutter, the rotary cutter cuts the lesion position, the negative pressure in the collection tank 220 is transmitted to the cannula 120 through the extraction tube 140, so that the tissue cut by the rotary cutter is extracted into the collection tank 220, if the tissue blocks the cannula 120, the negative pressure intensity in the collection tank 220 will increase, at this time, the pressure control mechanism 300 controls heating of the annular memory metal, so that the annular memory metal expands by heating, the medical silica gel layer deforms, so that the inner diameter of the cannula 120 is enlarged, and the negative pressure intensity in the collection tank 220 is increased, so that the large piece of tissue can be extracted;

[0039] The inner wall of the cannula 120 is provided with a heating wire, and the pressure control mechanism 300 controls the heating wire to heat the annular memory metal to deform.

[0040] In an optional mode of the embodiment, the following is more preferred:

[0041] The negative pressure extraction mechanism 200 further comprises a cylinder cover 210, the cylinder cover 210 is threadedly connected to the collection tank 220, and the extraction tube 140 penetrates through the cylinder cover 210 and is communicated with the collection tank 220.

[0042] The cylinder cover 210 is provided with a sealing ring to ensure that there is no leakage at the connection, improve the negative pressure extraction efficiency, and at the same time, the threaded design of the cylinder cover 210 facilitates quick assembly and disassembly, and after sampling, the collection tank 220 can be disassembled for inspection.

[0043] In an optional mode of the embodiment, the following is more preferred:

[0044] The negative pressure extraction mechanism 200 further comprises a vacuum pump 230, the vacuum pump 230 is provided with an air extraction tube 240, the air extraction tube 240 penetrates through the cylinder cover 210 and is communicated with the collection tank 220.

[0045] The vacuum pump 230 extracts the air in the collection tank 220 through the suction pipe 240 to form a stable negative pressure environment, ensuring the collection of the tissue sample. During the operation, the operator can observe the cutting of the rotary cutter in real time through the endoscope to ensure accurate sampling. When the rotary cutter rotates at high speed, the negative pressure extraction mechanism 200 rapidly sucks the sample into the collection tank 220, avoiding sample contamination. If the quality of the initial sampling does not meet the standard, Gram staining verification can be performed immediately, and if necessary, secondary sampling can be performed using the same device to ensure the integrity and reliability of the sample.

[0046] In an optional mode of the embodiment, the following is more preferred:

[0047] The pressure control mechanism 300 includes a detection pipe 310 connected to the suction pipe 240, and a passive cylinder 340 connected to the detection pipe 310. The output end of the passive cylinder 340 is connected to a first sliding switch 350 and a second sliding switch 360. When the suction pipe 140 is blocked, the negative pressure intensity in the detection pipe 310 increases, causing the passive cylinder 340 to shorten. The first sliding switch 350 and the second sliding switch 360 are both slid and control the increase of the rotation speed of the vacuum pump 230 and the heating deformation of the annular memory metal, respectively.

[0048] The suction pipe 240 is connected to the detection pipe 310, so that the pressure in the collection tank 220 can be transmitted to the detection pipe 310. The vacuum pump 230 continuously operates to generate negative pressure in the collection tank 220. When the end of the cannula 120 is blocked by a large piece of tissue, the internal negative pressure of the detection pipe 310 increases synchronously. At this time, the negative pressure is transmitted to the passive cylinder 340, causing it to shorten. The first sliding switch 350 and the second sliding switch 360 are triggered to increase the rotation speed of the vacuum pump 230 and turn on or increase the power of the heating wire to heat the annular memory metal, respectively, to increase the negative pressure intensity of extraction and expand the inner diameter of the cannula 120, so that the blockage is relieved.

[0049] In an optional mode of the embodiment, the following is more preferred:

[0050] The piston plate 321 is slidably connected in the detection pipe 310. The lower surface of the piston plate 321 is fixedly connected to a cylindrical rod 320. The inner wall of the detection pipe 310 is provided with a convex ring, and the cylindrical rod 320 is attached to the inner wall of the convex ring. The first spring 322 is connected between the piston plate 321 and the convex ring. The first pipe 330 is connected between the detection pipe 310 and the passive cylinder 340, and the throttling valve 331 is arranged on the first pipe 330.

[0051] When the negative pressure in the detection tube 310 is enhanced, the piston plate 321 moves downward, the first spring 322 is compressed, the air in the passive air cylinder 340 is transferred to the upper space of the piston plate 321, and the setting of the throttle valve 331 controls the flow rate of the air flow through the first pipeline 330, so that the negative pressure change is more stable, the instantaneous pressure fluctuation is avoided to cause damage to the sample, the continuity and stability of the sampling process are ensured, and the safety and efficiency of the overall operation are improved.

[0052] In an optional mode of the embodiment, the following is more preferred:

[0053] The output end of the passive air cylinder 340 is fixedly connected with a rectangular plate 341, two rectangular through holes are formed in the rectangular plate 341, threaded rods 370 are fixedly connected to the sliding pieces of the first sliding switch 350 and the second sliding switch 360, the two threaded rods 370 are respectively slidably connected to the two rectangular through holes, and nuts 371 are threadedly connected to the two threaded rods 370. When the locking nuts 371 are tightened, the rectangular plate 341 can drive the two sliding pieces to move synchronously.

[0054] In the initial state, the nuts 371 are removed from the two threaded rods 370, so that the two sliding pieces can slide freely and are not limited by the rectangular plate 341. At this time, the positions of the two sliding pieces are adjusted, so that the vacuum pump 230 and the electric heating wire operate at a set power. Then the nuts 371 are tightened on the threaded rods 370. At this time, the sliding of the rectangular plate 341 can drive the two sliding pieces to slide synchronously, so that the rotation speed of the vacuum pump 230 increases while the heating power of the electric heating wire is synchronously improved, ensuring that the negative pressure and the heating effect are synergistically enhanced when processing large pieces of tissue, effectively avoiding the blockage of the cannula, and improving the extraction efficiency.

[0055] In an optional mode of the embodiment, the following is more preferred:

[0056] The sampling mechanism 100 further comprises a small motor 130 fixedly connected in the handle 110, and a drill rod 131 fixedly connected to the output end of the small motor 130.

[0057] The small motor 130 drives the rotary cutter through the drill rod 131. The rotation speed of the small motor 130 can be adjusted to 0-500 rpm. In cooperation with the helical sawtooth design of the rotary cutter head at the end of the drill rod 131, efficient cutting is realized. The small motor 130 is controlled to reverse by the handle 110, so as to ensure the directional movement of the rotary cutter in the lesion. In combination with the negative pressure effect, the sample is recovered into the collection tank 220, so as to improve the operation accuracy and sample integrity.

[0058] Regarding the structure of the pulse mechanism 400, specifically:

[0059] The pulse mechanism 400 comprises a cylinder 470 connected with the extraction pipe 140, and a circular plate 480 is slidingly connected in the cylinder 470, and the circular plate 480 can instantaneously increase the extraction force of the cannula 120 when it rapidly moves downward in the cylinder 470.

[0060] The cylinder 470 is connected with the extraction pipe 140, and when the circular plate 480 rapidly slides downward in the cylinder 470, the internal space of the extraction pipe 140 can be rapidly increased, so that the negative pressure strength in the extraction pipe 140 is rapidly increased, and then the circular plate 480 is moved upward to reset, forming a pulse negative pressure, which provides sufficient negative pressure adsorption support for the extraction of the large tissue sample in the cannula 120.

[0061] In an optional mode of the embodiment, the following is more preferable:

[0062] The pulse mechanism 400 further comprises a small hydraulic rod 460 fixedly connected to the outer wall of the extraction pipe 140, and the circular plate 480 is fixedly connected to the output end of the small hydraulic rod 460.

[0063] The small hydraulic rod 460 drives the circular plate 480 to rapidly move upward and downward through hydraulic pressure, so as to realize the generation of pulse negative pressure.

[0064] In an optional mode of the embodiment, the following is more preferable:

[0065] The cannula 120 is rotationally connected with an electromagnetic ring 410, the inner wall of the cannula 120 is fixedly connected with an arc-shaped piston cylinder 430, the arc-shaped piston cylinder 430 is slidingly connected with an arc-shaped piston rod 420 through a second spring 440, the arc-shaped piston rod 420 is fixedly connected with the electromagnetic ring 410, the arc-shaped piston cylinder 430 is connected with the small hydraulic rod 460 through a second pipe 450, and the electromagnetic ring 410 can be magnetically attracted to the drill rod 131 when it is electrified, so that the drill rod 131 drives the small hydraulic rod 460 to elongate through the electromagnetic ring 410.

[0066] The electromagnetic ring 410 generates magnetic force by being electrified, the electrification of the electromagnetic ring 410 can be controlled by an external switch or by a program, the running state of the electromagnetic ring 410 is intermittent electrification, so that the electromagnetic ring 410 and the drill rod 131 are intermittently magnetically attracted and synchronously rotated, if the program control is adopted, the passive air cylinder 340 is shortened, at this time, the negative pressure intensity is increased, and the inner diameter of the insertion tube 120 is expanded, the electromagnetic ring 410 is electrified at this time, the drill rod 131 drives the electromagnetic ring 410 to rotate, the electromagnetic ring 410 drives the arc-shaped piston rod 420 to slide into the arc-shaped piston cylinder 430, so that the hydraulic oil in the arc-shaped piston cylinder 430 flows into the small hydraulic rod 460, so that the small hydraulic rod 460 is elongated, drives the circular plate 480 to move downward, then the electromagnetic ring 410 is de-energized, the second spring 440 drives the arc-shaped piston rod 420 to slide back, so that the electromagnetic ring 410 rotates back, at this time, the small hydraulic rod 460 is shortened, so that the circular plate 480 moves upward to reset, forming a stable pulse negative pressure cycle, then the electromagnetic ring 410 is electrified again and then de-energized, the intermittent magnetic attraction between the electromagnetic ring 410 and the drill rod 131 ensures the stability of the pulse negative pressure cycle, effectively avoids the blockage, reduces the risk of operation interruption, and improves the sampling efficiency.

[0067] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A minimally invasive visualized biopsy device for precision sampling of a periprosthetic joint infection, characterized by: It comprises a sampling mechanism (100), a negative pressure extraction mechanism (200) and a pressure control mechanism (300); The sampling mechanism (100) comprises a handle (110), a cannula (120) connected to the handle (110), and a drill rod (131) rotatably connected in the cannula (120); The negative pressure extraction mechanism (200) comprises an extraction pipe (140), one end of which is in communication with the cannula (120) and the other end of which is in communication with a collection tank (220); The pressure control mechanism (300) is connected to the collection tank (220), the inner wall of the cannula (120) is attached with a medical silica gel layer, an annular memory metal is installed in the medical silica gel layer, when the cannula (120) is blocked, the pressure control mechanism (300) controls the negative pressure intensity in the collection tank (220) to increase, and the annular memory metal is heated and deformed to increase the inner diameter of the cannula (120); The negative pressure extraction mechanism (200) further comprises a cylinder cover (210), which is threadedly connected to the collection tank (220), and the extraction pipe (140) penetrates through the cylinder cover (210) and is in communication with the collection tank (220); The negative pressure extraction mechanism (200) further comprises a vacuum pump (230), and an air extraction pipe (240) is installed on the vacuum pump (230), the air extraction pipe (240) penetrates through the cylinder cover (210) and is in communication with the collection tank (220); The pressure control mechanism (300) comprises a detection pipe (310) in communication with the air extraction pipe (240), the detection pipe (310) is in communication with a passive air cylinder (340), the output end of the passive air cylinder (340) is connected with a first sliding switch (350) and a second sliding switch (360), when the extraction pipe (140) is blocked, the negative pressure intensity in the detection pipe (310) increases, so that the passive air cylinder (340) is shortened, the first sliding switch (350) and the second sliding switch (360) are both slid and respectively control the vacuum pump (230) to increase the rotating speed, and the annular memory metal is heated and deformed.

2. The minimally invasive visualized biopsy device for precision sampling of a periprosthetic joint infection of claim 1, wherein: A piston plate (321) is slidably connected in the detection pipe (310), the lower surface of the piston plate (321) is fixedly connected with a cylindrical rod (320), the inner wall of the detection pipe (310) is provided with a convex ring, the cylindrical rod (320) is attached to the inner wall of the convex ring, the first spring (322) is connected between the piston plate (321) and the convex ring, the first pipeline (330) is connected between the detection pipe (310) and the passive air cylinder (340), and the first pipeline (330) is provided with a throttle valve (331).

3. The minimally invasive visualized biopsy device for precision sampling of a periprosthetic joint infection of claim 1, wherein: The output end of the passive air cylinder (340) is fixedly connected with a rectangular plate (341), two rectangular through holes are formed in the rectangular plate (341), the sliding blades of the first sliding switch (350) and the second sliding switch (360) are fixedly connected with threaded rods (370), the two threaded rods (370) are slidably connected with the two rectangular through holes, and the threaded rods (370) are threadedly connected with nuts (371).

4. The minimally invasive visualized biopsy device for precision sampling of a periprosthetic joint infection of claim 1, wherein: The sampling mechanism (100) further comprises a small motor (130) fixedly connected in the handle (110), and the drill rod (131) is fixedly connected to the output end of the small motor (130).

5. The minimally invasive visualized biopsy device for precision sampling of a periprosthetic joint infection of claim 1, wherein: Further comprising a pulse mechanism (400), the pulse mechanism (400) comprises a cylinder (470) communicated with the suction pipe (140), and a circular plate (480) is slidably connected in the cylinder (470), and the circular plate (480) can instantaneously increase the suction force of the cannula (120) when it rapidly moves downward in the cylinder (470).

6. The minimally invasive visualized biopsy device for precision sampling of a periprosthetic joint infection of claim 5, wherein: The pulse mechanism (400) further comprises a small hydraulic rod (460) fixedly connected to the outer wall of the suction pipe (140), and the circular plate (480) is fixedly connected to the output end of the small hydraulic rod (460).

7. The minimally invasive visualized biopsy device for precision sampling of a periprosthetic joint infection of claim 6, wherein: The cannula (120) is rotatably connected with an electromagnetic ring (410), the inner wall of the cannula (120) is fixedly connected with an arc-shaped piston cylinder (430), the arc-shaped piston cylinder (430) is slidably connected with an arc-shaped piston rod (420) through a second spring (440), the arc-shaped piston rod (420) is fixedly connected with the electromagnetic ring (410), the arc-shaped piston cylinder (430) and the small hydraulic rod (460) are communicated with a second pipeline (450), and the electromagnetic ring (410) can be magnetically attracted to the drill rod (131) when it is powered, so that the drill rod (131) drives the small hydraulic rod (460) to be elongated through the electromagnetic ring (410).

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