Medical equipment

Abstract

The utility model belongs to the technical field of medical instruments, and discloses medical equipment which comprises a cavity assembly, a rotary cutting catheter, a tool bit and a driving device, a liquid drainage cavity is formed in the cavity assembly, a pressurizing part is arranged in the liquid drainage cavity, and the liquid drainage cavity is divided into a first cavity and a second cavity through the pressurizing part; a liquid discharge hole communicated with the first cavity is further formed in the cavity assembly; the near end of the rotary cutting catheter is communicated with the second cavity; the cutter head is arranged at the far end of the rotary cutting catheter; the driving device comprises an output shaft, the far end of the output shaft penetrates into the liquid discharging cavity and is connected with the pressurizing piece, and the output shaft is connected with the tool bit. The output shaft rotates to drive the pressurizing piece and the tool bit to rotate. According to the medical equipment, the pressure intensity of the first cavity can be larger than that of the second cavity through rotation of the pressurizing piece, and negative pressure is formed in the second cavity so that the rotary cutting catheter can suck thrombus obtained through rotary cutting; positive pressure is formed in the first cavity, thrombus can be discharged out of the first cavity through the liquid discharging hole, and operation is easy.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a medical device. Background Art

[0002] Thrombosis is mainly caused by slow blood flow and changes in blood viscosity on the basis of vascular stenosis or occlusion caused by atherosclerosis, atrial thrombus detachment, etc. Currently, thrombus removal can be done through percutaneous mechanical thrombectomy (PMT).

[0003] Specifically, percutaneous mechanical thrombectomy is usually performed through a vascular rotary cutting product, which is usually connected to a suction pump. The vascular rotary cutting product includes a drive device, a rotary cutting catheter, and a blade located at the distal end of the rotary cutting catheter. The drive device can drive the blade to rotary cut the thrombus. Under the action of the suction pump, negative pressure is generated in the rotary cutting catheter, and the thrombus removed by rotary cutting is collected through the rotary cutting catheter. During the operation, the doctor needs to control the drive device and the suction pump at the same time to complete the operation, which is complicated. Utility Model Content

[0004] The utility model aims to provide a medical device with simple surgical operation.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] A medical device is provided, comprising:

[0007] A chamber assembly, wherein a drainage chamber is provided in the chamber assembly, a pressurizing member is provided in the drainage chamber, the drainage chamber is divided into a first chamber and a second chamber by the pressurizing member, and the chamber assembly is further provided with a drainage hole communicating with the first chamber;

[0008] a rotary cutting catheter, wherein the proximal end of the rotary cutting catheter is connected to the second chamber;

[0009] A blade head, disposed at the distal end of the rotary cutting catheter;

[0010] The driving device comprises an output shaft, the distal end of which is inserted into the drainage cavity and connected to the pressurizing member, and the output shaft is connected to the cutter head; wherein,

[0011] The rotation of the output shaft can drive the booster and the cutter head to rotate, and the rotation of the booster can make the pressure of the first chamber greater than the pressure of the second chamber.

[0012] Optionally, the chamber assembly comprises:

[0013] A first set is provided with a first through hole and the drainage hole, wherein the first through hole includes a first hole portion and a second hole portion, the output shaft is rotatably arranged in the first hole portion, and the second hole portion is connected to the drainage hole;

[0014] The second set is provided with a second through hole, wherein the second through hole includes a third hole portion and a fourth hole portion, wherein the third hole portion and the second hole portion enclose the drainage cavity, and the rotary cutting catheter is passed through the fourth hole portion.

[0015] Optionally, the second set is provided with one end of the third hole portion inserted into the second hole portion, and the booster is provided in the second hole portion.

[0016] Optionally, a first sealing ring is provided between one end of the first sleeve having the second hole portion and one end of the second sleeve having the third hole portion.

[0017] Optionally, the aperture of the third hole portion is larger than the aperture of the fourth hole portion.

[0018] Optionally, a second sealing ring is provided in the fourth hole portion, and the rotary cutting catheter is passed through the second sealing ring.

[0019] Optionally, the first set is provided with a third sealing ring in the second hole portion, the output shaft passes through the third sealing ring, and the first chamber is formed between the third sealing ring and the supercharging component.

[0020] Optionally, the output shaft comprises:

[0021] a first shaft, rotatably connected to the chamber assembly;

[0022] A second shaft is slidably connected to the first shaft along the axial direction of the output shaft, and the second shaft connects the supercharging member and the cutter head;

[0023] An elastic member, wherein a first end of the elastic member is connected to the first shaft, and a second end of the elastic member is connected to the second shaft.

[0024] Optionally, a buffer pad is provided between the first shaft and the second shaft, one of the first shaft and the second shaft is provided with a sliding portion, and the other is provided with a sliding groove, and the sliding portion passes through the buffer pad and the sliding groove in sequence.

[0025] Optionally, the chamber assembly includes a first set, the first set is provided with a first through hole, the first through hole includes a first hole portion and a second hole portion, the first hole portion is stepped and provided with a first step surface, the small end of the first hole portion is connected to the second hole portion, and the small end of the first hole portion has a smaller aperture than the aperture of the second hole portion, and a second step surface is formed between the second hole portion and the first hole portion;

[0026] The first shaft is provided with a first shaft shoulder, and the first shaft is sleeved with a first bearing on a side of the first shaft shoulder facing the second shaft, the side of the first shaft shoulder facing the second shaft abuts against the inner ring of the first bearing, and the outer ring of the first bearing abuts against the first step surface;

[0027] The second shaft is provided with a second shaft shoulder. The second shaft is sleeved with a second bearing on a side of the second shaft shoulder facing away from the first shaft. The outer ring of the second bearing abuts against the second step surface.

[0028] Beneficial effects of the utility model:

[0029] The medical device provided by the utility model controls the output shaft of the driving device to rotate during the operation, and the rotation of the output shaft drives the booster and the cutter head to rotate. The rotation of the cutter head can peel off the thrombus, and the rotation of the booster can make the pressure of the first chamber greater than the pressure of the second chamber, that is, the first chamber forms a positive pressure, and the second chamber forms a negative pressure. The negative pressure formed in the second chamber can make the peeling catheter absorb the peeled thrombus, and the thrombus flows into the first chamber through the peeling catheter and the second chamber in turn; the positive pressure formed in the first chamber can make the thrombus discharged from the first chamber through the drainage hole, completing the removal of the thrombus, and the operation is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural cross-sectional view of the medical device provided by the utility model;

[0031] Figure 2 It is a partial structural sectional view of the medical device provided by the utility model;

[0032] Figure 3 It is another partial structural cross-sectional view of the medical device provided by the utility model;

[0033] Figure 4 It is a structural sectional view of the first kit provided by the utility model.

[0034] In the figure:

[0035] 100, chamber assembly; 101, drainage chamber; 1011, first chamber; 1012, second chamber; 102, pressurizing member; 103, drainage hole; 110, first set; 111, first through hole; 1111, first hole portion; 1112, second hole portion; 1113, first stepped surface; 1114, second stepped surface; 120, second set; 121, second through hole; 1211, third hole portion; 1212, fourth hole portion; 122, sealing groove; 123, stop shoulder;

[0036] 210. rotary cutting catheter; 220. drainage tube;

[0037] 300, cutter head; 310, transmission shaft;

[0038] 400, driving device; 410, output shaft; 411, first shaft; 4111, sliding portion; 4112, first shaft shoulder; 412, second shaft; 4121, slide groove; 4122, second shaft shoulder; 413, elastic member; 414, buffer pad; 420, driving member; 430, gear set;

[0039] 510, first sealing ring; 520, second sealing ring; 530, third sealing ring; 540, retaining ring;

[0040] 610, first bearing; 620, second bearing; 630, third bearing. DETAILED DESCRIPTION

[0041] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0042] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0044] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0045] Reference Figures 1 to 3 As shown, this embodiment provides a medical device, including a chamber assembly 100 , a rotary cutting catheter 210 , a cutting head 300 and a driving device 400 .

[0046] Specifically, a drainage chamber 101 is provided in the chamber assembly 100, a booster 102 is provided in the drainage chamber 101, the drainage chamber 101 is divided into a first chamber 1011 and a second chamber 1012 by the booster 102, and a drainage hole 103 communicating with the first chamber 1011 is also provided on the chamber assembly 100; the proximal end of the rotary cutting catheter 210 is communicated with the second chamber 1012; the cutter head 300 is arranged at the distal end of the rotary cutting catheter 210; the driving device 400 includes an output shaft 410, the distal end of the output shaft 410 is passed through the drainage chamber 101 and connected to the booster 102, and the output shaft 410 is connected to the cutter head 300. The rotation of the output shaft 410 can drive the booster 102 and the cutter head 300 to rotate, and the rotation of the booster 102 can make the pressure of the first chamber 1011 greater than the pressure of the second chamber 1012. The distal end of the rotary cutting catheter 210 refers to the end of the rotary cutting catheter 210 extending into the blood vessel during the operation, and the proximal end of the rotary cutting catheter 210 refers to the end opposite to the distal end.

[0047] During the operation, the output shaft 410 of the driving device 400 is controlled to rotate, and the rotation of the output shaft 410 drives the booster 102 and the cutter head 300 to rotate. The rotation of the cutter head 300 can cut the thrombus, and the rotation of the booster 102 can make the pressure of the first chamber 1011 greater than the pressure of the second chamber 1012, that is, the first chamber 1011 forms a positive pressure, and the second chamber 1012 forms a negative pressure. The negative pressure formed in the second chamber 1012 can make the rotary cutting catheter 210 absorb the thrombus cut by rotary cutting, and the thrombus flows into the first chamber 1011 through the rotary cutting catheter 210 and the second chamber 1012 in turn; the positive pressure formed in the first chamber 1011 can make the thrombus discharged from the first chamber 1011 through the drainage hole 103, that is, the liquid in the drainage chamber 101 can be discharged in time, so that the medical device can continue to work, complete the removal of the thrombus, and the operation is simple.

[0048] Exemplarily, the supercharger 102 includes but is not limited to a turbine or a screw. The turbine may be a worm propeller. Exemplarily, the supercharger 102 may be fixedly connected to the output shaft 410 by welding.

[0049] Exemplarily, the blade head 300 is connected to the output shaft 410 via a transmission shaft 310, and the transmission shaft 310 is disposed through the rotary cutting catheter 210. The transmission shaft 310 is flexible and can adapt to the bending of the rotary cutting catheter 210, so that the blade head 300 can reach the desired thrombus removal location, effectively preventing the blade head 300 from causing damage to the blood vessel. Exemplarily, the transmission shaft 310 can be a spring structure.

[0050] Exemplarily, the drainage hole 103 is connected to a drainage pipe 220 , through which the liquid in the first chamber 1011 is discharged to a desired position.

[0051] In this embodiment, refer to Figures 1 to 4 As shown, the chamber assembly 100 includes a first set 110 and a second set 120. The first set 110 is provided with a first through hole 111 and a drainage hole 103, the first through hole 111 includes a first hole portion 1111 and a second hole portion 1112, the output shaft 410 is rotatably arranged in the first hole portion 1111, and the second hole portion 1112 is connected to the drainage hole 103; the second set 120 is provided with a second through hole 121, the second through hole 121 includes a third hole portion 1211 and a fourth hole portion 1212, the third hole portion 1211 and the second hole portion 1112 are enclosed to form a drainage cavity 101, and the fourth hole portion 1212 is provided with a rotary cutting catheter 210. In this embodiment, the chamber assembly 100 is divided into the first set 110 and the second set 120, which is convenient for processing and manufacturing, and convenient for connecting the output shaft 410, the rotary cutting catheter 210 and the cutter head 300.

[0052] Specifically, one end of the second set 120 having the third hole 1211 is inserted into the second hole 1112, and the booster 102 is disposed in the second hole 1112, that is, the first chamber 1011 is a part of the second hole 1112, which can better ensure the sealing of the second chamber 1012, and the rotation of the booster 102 can form a stable negative pressure in the second chamber 1012. Exemplarily, one end of the second set 120 having the third hole 1211 can be connected to the second hole 1112 by a threaded connection.

[0053] Specifically, a first sealing ring 510 is provided between one end of the first set 110 provided with the second hole portion 1112 and one end of the second set 120 provided with the third hole portion 1211, so as to ensure the sealing of the liquid discharge chamber 101. Exemplarily, a sealing groove 122 is provided at the periphery of one end of the second set 120 provided with the third hole portion 1211, and a first sealing ring 510 is provided in the sealing groove 122, and the hole wall of the second hole portion 1112 abuts against the first sealing ring 510 to form a seal. Exemplarily, the first sealing ring 510 can be an O-ring. Exemplarily, a limiting shoulder 123 is also provided at one end of the second set 120 provided with the third hole portion 1211, and one end of the first set 110 provided with the second hole portion 1112 abuts against the limiting shoulder 123 to achieve axial positioning between the first set 110 and the second set 120, and the coaxiality between the first set 110 and the second set 120 can be ensured.

[0054] Specifically, a second sealing ring 520 is disposed in the fourth hole 1212, and the rotary cutting catheter 210 is passed through the second sealing ring 520, which can better ensure the sealing of the second chamber 1012 and form a stable negative pressure in the second chamber 1012. Exemplarily, the second sealing ring 520 can be an O-ring.

[0055] In a feasible embodiment, the aperture of the third hole portion 1211 is larger than the aperture of the fourth hole portion 1212, so that a greater negative pressure can be formed in the rotary cutting catheter 210, so that the rotary cutting catheter 210 has a greater suction force on the thrombus removed by rotary cutting, and effectively ensures that the thrombus removed by rotary cutting can smoothly enter the second chamber 1012, thereby improving the efficiency of the operation.

[0056] In this embodiment, refer to Figure 3 As shown, the first set 110 is provided with a third sealing ring 530 in the second hole 1112, the output shaft 410 is passed through the third sealing ring 530, and a first chamber 1011 is formed between the third sealing ring 530 and the supercharger 102, which effectively ensures the sealing of the first chamber 1011 and prevents the liquid in the first chamber 1011 from flowing into the first hole 1111, which is safe and reliable. Exemplarily, the third sealing ring 530 can be a Variseal sealing ring.

[0057] In this embodiment, refer to Figure 1 and Figure 3As shown, the output shaft 410 may include a first shaft 411, a second shaft 412 and an elastic member 413. The first shaft 411 is rotatably connected to the chamber assembly 100; the second shaft 412 is slidably connected to the first shaft 411 along the axial direction of the output shaft 410, and the second shaft 412 connects the booster 102 and the cutter head 300; the first end of the elastic member 413 is connected to the first shaft 411, and the second end of the elastic member 413 is connected to the second shaft 412. In this embodiment, the first shaft 411 is controlled to rotate, and the rotation of the first shaft 411 can drive the second shaft 412 to rotate through the elastic member 413, thereby driving the booster 102 and the cutter head 300 to rotate. The elastic member 413 is equivalent to a fuse, which provides additional protection when the cutter head 300 is stuck with a hard plaque or thrombus, and the deformation of the elastic member 413 ensures safety during the operation. In addition, the elastic member 413 can also ensure the buffering amount when the second shaft 412 moves axially.

[0058] Specifically, the second shaft 412 passes through the third sealing ring 530 and the supercharging component 102 and is connected to the transmission shaft 310 .

[0059] Exemplarily, the elastic member 413 may be a spring. The elastic member 413 may be sleeved on the first shaft 411 and the second shaft 412. Exemplarily, the elastic member 413 may be connected to the first shaft 411 and the second shaft 412 by welding.

[0060] In a feasible implementation, a buffer pad 414 is provided between the first shaft 411 and the second shaft 412, one of the first shaft 411 and the second shaft 412 is provided with a sliding portion 4111, and the other is provided with a sliding groove 4121, and the sliding portion 4111 is penetrated by the buffer pad 414 and the sliding groove 4121 in sequence. In this embodiment, the cooperation of the sliding portion 4111 and the sliding groove 4121 can make the axial sliding between the first shaft 411 and the second shaft 412 stable and reliable, and convenient for assembly; the buffer pad 414 can prevent the first shaft 411 and the second shaft 412 from rigid collision, effectively ensuring the service life of the output shaft 410. In addition, the sliding cooperation of the sleeves of the first shaft 411 and the second shaft 412 can make the first shaft 411 and the second shaft 412 maintain good coaxiality when the elastic member 413 is welded.

[0061] In this embodiment, refer to Figure 1 , Figure 3 and Figure 4 As shown, the first shaft 411 and the second shaft 412 are both rotatably connected to the first kit 110 via bearings, which effectively ensures the coaxiality between the first shaft 411 and the second shaft 412, ensures the rotational stability of the first shaft 411 and the second shaft 412, and ensures the coaxiality between the first shaft 411, the second shaft 412 and the fourth hole portion 1212.

[0062] Specifically, the first hole portion 1111 is stepped and has a first step surface 1113. The small end of the first hole portion 1111 is connected to the second hole portion 1112. The small end diameter of the first hole portion 1111 is smaller than the diameter of the second hole portion 1112. A second step surface 1114 is formed between the second hole portion 1112 and the first hole portion 1111.

[0063] Specifically, the first shaft 411 is provided with a first shaft shoulder 4112, and the first shaft 411 is sleeved with a first bearing 610 on the side of the first shaft shoulder 4112 facing the second shaft 412, and the side of the first shaft shoulder 4112 facing the second shaft 412 abuts against the inner ring of the first bearing 610, and the outer ring of the first bearing 610 abuts against the first step surface 1113. In this embodiment, the first set 110 realizes axial limitation of the first bearing 610 through the first step surface 1113, and realizes axial positioning of the first shaft 411 relative to the first set 110 through the cooperation between the first shaft shoulder 4112 and the first bearing 610.

[0064] Specifically, the second shaft 412 is provided with a second shaft shoulder 4122, and the second shaft 412 is sleeved with a second bearing 620 on the side of the second shaft shoulder 4122 facing away from the first shaft 411, and the outer ring of the second bearing 620 abuts against the second step surface 1114. In this embodiment, the first set 110 realizes the axial limit of the second bearing 620 through the second step surface 1114, and the sliding range of the second shaft 412 relative to the first shaft 411 is limited by the cooperation between the second shaft shoulder 4122 and the second bearing 620. In addition, the cooperation between the first bearing 610 and the second bearing 620 can make the rotation of the first shaft 411 and the second shaft 412 stable and reliable, effectively ensure the sealing between the second shaft 412 and the third sealing ring 530, extend the service life of the third sealing ring 530, prevent the liquid in the drainage cavity 101 from contaminating the bearing after passing through the third sealing ring 530, and extend the service life of the bearing. The inner ring of the second bearing 620 and the second shaft 412 may be clearance-matched with the shaft hole, so that the second shaft 412 can slide relative to the first shaft 411 .

[0065] In a feasible implementation manner, a third bearing 630 may be sleeved on the first shaft 411 at a side of the first shaft shoulder 4112 facing away from the second shaft 412 , so as to further ensure the rotation stability of the first shaft 411 and the axial positioning of the first shaft 411 .

[0066] In a feasible embodiment, a retaining ring 540 is provided between the second bearing 620 and the third sealing ring 530, and the second bearing 620 and the third sealing ring 530 are respectively abutted against the corresponding sides of the retaining ring 540. The second bearing 620 and the third sealing ring 530 are separated by the retaining ring 540 to prevent the second bearing 620 from causing wear to the third sealing ring 530, and the axial positioning of the second bearing 620 and the third sealing ring 530 is achieved.

[0067] In this embodiment, refer to Figure 1 As shown, the driving device 400 further includes a driving member 420 , which can be transmission-connected to the output shaft 410 via a gear set 430 , thereby effectively ensuring the rotation stability of the output shaft 410 .

[0068] Specifically, the gear set 430 may include at least two gears meshing in sequence. The driving member 420 is connected to the driving gear of the gear set 430, and the output gear of the gear set 430 is connected to the first shaft 411. Exemplarily, the distance L between the output gear of the gear set 430 and the first set 110 may be 1 mm-3 mm, such as 1.5 mm, 2 mm or 2.5 mm, so that the first shaft 411 has a smaller cantilever beam amount, ensuring the stability of the rotation of the output shaft 410.

[0069] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A medical device, characterized in that: include: A chamber assembly (100), wherein a drainage chamber (101) is provided in the chamber assembly (100), a pressurizing component (102) is provided in the drainage chamber (101), the drainage chamber (101) is divided into a first chamber (1011) and a second chamber (1012) by the pressurizing component (102), and the chamber assembly (100) is also provided with a drainage hole (103) communicating with the first chamber (1011); A rotary cutting catheter (210), wherein the proximal end of the rotary cutting catheter (210) is connected to the second chamber (1012); A cutting head (300) is arranged at the distal end of the rotary cutting catheter (210); The driving device (400) comprises an output shaft (410), the distal end of the output shaft (410) is inserted into the drainage cavity (101) and connected to the booster (102), and the output shaft (410) is connected to the cutter head (300); wherein, The rotation of the output shaft (410) can drive the booster (102) and the cutter head (300) to rotate, and the rotation of the booster (102) can make the pressure of the first chamber (1011) greater than the pressure of the second chamber (1012).

2. The medical device according to claim 1, characterized in that The chamber assembly (100) comprises: The first set (110) is provided with a first through hole (111) and the drainage hole (103), wherein the first through hole (111) comprises a first hole portion (1111) and a second hole portion (1112), wherein the output shaft (410) is rotatably arranged in the first hole portion (1111), and the second hole portion (1112) is connected to the drainage hole (103); The second set (120) is provided with a second through hole (121), wherein the second through hole (121) includes a third hole portion (1211) and a fourth hole portion (1212), wherein the third hole portion (1211) and the second hole portion (1112) enclose the drainage cavity (101), and the rotary cutting catheter (210) is inserted into the fourth hole portion (1212).

3. The medical device according to claim 2, characterized in that The second set (120) is provided with one end of the third hole portion (1211) inserted into the second hole portion (1112), and the booster (102) is arranged in the second hole portion (1112).

4. The medical device according to claim 2, characterized in that A first sealing ring (510) is provided between one end of the first set (110) provided with the second hole portion (1112) and one end of the second set (120) provided with the third hole portion (1211).

5. The medical device according to claim 2, characterized in that The diameter of the third hole portion (1211) is greater than the diameter of the fourth hole portion (1212).

6. The medical device according to claim 2, characterized in that A second sealing ring (520) is disposed in the fourth hole portion (1212), and the rotary cutting catheter (210) is passed through the second sealing ring (520).

7. The medical device according to claim 2, characterized in that The first set (110) is provided with a third sealing ring (530) in the second hole portion (1112), the output shaft (410) passes through the third sealing ring (530), and the first chamber (1011) is formed between the third sealing ring (530) and the booster (102).

8. The medical device according to claim 1, characterized in that The output shaft (410) comprises: A first shaft (411) rotatably connected to the chamber assembly (100); a second shaft (412) slidably connected to the first shaft (411) along the axial direction of the output shaft (410), the second shaft (412) connecting the supercharging component (102) and the cutter head (300); An elastic member (413), wherein a first end of the elastic member (413) is connected to the first shaft (411), and a second end of the elastic member (413) is connected to the second shaft (412).

9. The medical device according to claim 8, characterized in that A buffer pad (414) is provided between the first shaft (411) and the second shaft (412); one of the first shaft (411) and the second shaft (412) is provided with a sliding portion (4111), and the other is provided with a sliding groove (4121); the sliding portion (4111) passes through the buffer pad (414) and the sliding groove (4121) in sequence.

10. The medical device according to claim 8, characterized in that The chamber assembly (100) comprises a first set (110), the first set (110) is provided with a first through hole (111), the first through hole (111) comprises a first hole portion (1111) and a second hole portion (1112), the first hole portion (1111) is stepped and provided with a first step surface (1113), the small end of the first hole portion (1111) is connected to the second hole portion (1112), and the aperture of the small end of the first hole portion (1111) is smaller than the aperture of the second hole portion (1112), and a second step surface (1114) is formed between the second hole portion (1112) and the first hole portion (1111); The first shaft (411) is provided with a first shaft shoulder (4112), and a first bearing (610) is sleeved on the first shaft (411) on the side of the first shaft shoulder (4112) facing the second shaft (412), and the side of the first shaft shoulder (4112) facing the second shaft (412) abuts against the inner ring of the first bearing (610), and the outer ring of the first bearing (610) abuts against the first step surface (1113); The second shaft (412) is provided with a second shaft shoulder (4122), and a second bearing (620) is sleeved on the side of the second shaft shoulder (4122) facing away from the first shaft (411), and the outer ring of the second bearing (620) is in contact with the second step surface (1114).

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