WO2021169135A1

WO2021169135A1 - Rotational atherectomy device for calcified lesion in blood vessel

Info

Publication number: WO2021169135A1
Application number: PCT/CN2020/100091
Authority: WO
Inventors: 张永琪
Original assignee: 为泰医疗器械(深圳)有限公司
Priority date: 2020-07-03
Filing date: 2020-07-03
Publication date: 2021-09-02
Also published as: JP7465882B2; JP2022525503A; DE112020000311T5; CN114144131A; DE212020000500U1

Abstract

Disclosed is a rotational atherectomy device for a calcified lesion in a blood vessel. The rotational atherectomy device is provided with a rotational atherectomy head, and a water pump is used to drive the rotational atherectomy head to rotate by means of a water turbine. A high-pressure liquid is used to hit a water wheel to convert liquid kinetic energy into rotation mechanical energy of the water wheel, and a transmission acceleration mechanism is driven to make the rotational atherectomy head rotate, in order to dredge or alleviate extremely narrow atherosclerotic lesions, which are severely calcified or fibrotic, on the periphery of a human body and in a coronary vessel. The rotational atherectomy head rotates at a high speed with a small transmission noise, friction heat that is caused by rotational atherectomy and retained in a human body is reduced, the amount of cooling and lubricating solution input into the human body is reduced, and the metabolic burden of kidneys of the human body is relieved. The rotational atherectomy device is safe and reliable, and has a simple structure and a low cost.

Description

Rotary atherectomy device for intravascular calcification lesions

Technical field

The invention relates to a medical device, in particular to a device for interventional treatment of coronary artery calcification lesions.

technical background

Coronary atherectomy (Rotational atherectomy) is an indispensable operation for successful completion of PCI in some special lesions such as severe calcification. For some severely narrow, severely calcified or fibrotic lesions, it is a more clinically useful interventional treatment. The prior art adopts a rotational atherectomy device and uses a diamond grinding head that is inserted into the coronary arteries of the human body to rotate at a high speed. The lesions in the rotational atherectomy arteries can dredge the severely occluded coronary arteries. Among them, one is to use a high-speed motor to drive the diamond grinding head to rotate. The representative product is CSI Diamondback 360 Coronary Orbital Atherectomy System. The other is to use high-pressure gas transmission to convert the kinetic energy of the gas into the rotating mechanical energy of the diamond grinding head. The representative product is the Boston Scientific Rotablato.

The shortcomings of the above two types of rotary pulverization equipment at the same time are:

1. The high-speed rotation of the diamond grinding head and the grinding head carrier in the human body will generate a lot of heat, which may cause a series of complications in the patient, such as vasospasm, acute thrombosis, and acute myocardial infarction;

2. Use a large amount of lubricating coolant solution into the human artery during use, which brings a greater burden to the human kidney function;

3. The driving motor and high-pressure gas will produce huge noise during use;

4. The residual particles produced by the rotational atherectomy head during the rotational atherectomy process will flow into the distal position of the vascular disease through the washing of blood and lubricating fluid.

The shortcomings of the above two types of rotary pulverization equipment are as follows:

1. Driven by the motor, the structure of the diamond grinding head is aimed at the positively narrow and large-area occlusion (clogging) of the rotational atherectomy blood vessel, which is difficult to effectively remove; it requires a lot of control signals to control the motor, which is easy to be wirelessly interfered; the motor control board needs battery power , The battery has the risk of effective power storage time.

2. High-pressure gas transmission, the structure and shape of the diamond grinding head are not suitable for improving unilateral calcification lesions of blood vessel walls and vascular bifurcation calcification lesions; the overall volume of the equipment is huge, and the equipment connection is complicated.

Summary of the invention

The purpose of the present invention is to provide a rotational atherectomy device for intravascular calcification lesions. The technical problem to be solved is to improve the safety of the operation and reduce the cost.

The invention adopts the following technical scheme: a rotational atherectomy device for intravascular calcification lesions, which is provided with a rotational atherectomy head, and is characterized in that the rotational atherectomy head is driven by a water pump to rotate through a hydraulic turbine.

The water pump of the present invention is a constant pressure water pump. The constant pressure water pump is connected to a rotary grinding head through a water flow control valve and a water turbine. The output liquid pressure of the constant pressure water pump is not less than 50Mpa, and the rotary grinding head rotates at 70,000 to 150,000 rad/min. Adjust the output liquid flow rate of the water flow control valve, and control the rotational speed of the rotary grinding head to a value in the range of 70,000 to 150,000 rad/min.

The water turbine of the present invention is formed by connecting a water wheel and a transmission acceleration mechanism.

The water wheel, the transmission acceleration mechanism and the rotary grinding head of the present invention are coaxially connected.

The water wheel of the present invention is provided with a shell assembly, and a water wheel rotor is coaxially arranged in the shell assembly; The other two cylinders with a diameter smaller than the cylinder are the inlet and outlet respectively. The axes of the inlet and outlet are perpendicular to the axis of the cylinder and are distributed at 30°-60°; the water wheel rotor is provided with a central axis along the central axis The axis is provided with a through hole, and at least two blades are connected to the central axis.

The transmission acceleration mechanism of the present invention is formed by connecting a first-order planetary acceleration gear mechanism and a second-order planetary acceleration gear mechanism.

The rotary grind head of the present invention is provided with a hexagonal hollow shaft. One end of the hexagonal hollow shaft forms a detachable connection structure with the output shaft of the second-stage planetary acceleration gear mechanism, and the other end is connected to one end of the rotary grind wire tube. A rotary grinding head is sleeved at one end, and the rotary grinding head extends out of the wire tube.

The axial section of the rotary atherectomy head of the present invention is a gourd shape, the small end of the gourd shape faces the distal end, and the axis of the rotary atherectomy wire tube coincides with the axis of the rotary atherectomy head.

The axial section of the rotary grind head of the present invention is a combination of a trapezoid and a rectangle. The bottom of the trapezoid coincides with the long side of the rectangle. The axial section of the rotary grind wire tube coincides with the rectangle, and the upper part of the axial section of the rotary grind wire tube. The outer edge coincides with the bottom bottom of the trapezoid of the rotary grinding head to form an eccentric rotary grinding head.

The distal end of the axial section of the rotary grind head of the present invention is in the shape of a gourd-shaped small end, and the axis of the rotary grind wire tube coincides with the axis of the gourd-shaped. The proximal end extends a first cone shape, the large end of the first cone shape extends a cylindrical shape, the second cone shape extends along the proximal end with the cylindrical outer diameter as the large end, and the second circular small end is the third cone shape. The end, extending along the proximal end of the third conical shape, the length of the cylindrical shape is less than the axial length of the first conical shape, the lower part of the axial section of the rotary grinding head is cut off in the axial direction, so that the outer edge of the lower part and the first conical small end The outer diameter is the same to the large end of the third cone shape, making it an eccentric rotary grinding head.

Compared with the prior art, the present invention uses high-pressure liquid to impact the water wheel to convert the kinetic energy of the liquid into the rotating mechanical energy of the water wheel, and drives the transmission acceleration mechanism to realize the rotation of the rotational atherectomy head. Severely calcified or fibrotic atherosclerotic lesions, the rotational atherectomy head rotates at a high speed with low noise, reduces the frictional heat retained in the human body caused by rotational atherectomy, reduces the amount of cooling and lubricating solution input to the human body, and reduces the metabolic burden of the human kidney , Safe, reliable, simple structure and low cost.

Description of the drawings

Figure 1 is a block diagram of the present invention.

Fig. 2 is an exploded schematic diagram of the structure of the water turbine of the present invention.

Fig. 3 is an exploded schematic view of the structure of the transmission acceleration mechanism of the present invention.

Fig. 4 is an exploded schematic diagram of the water wheel structure of the present invention.

Fig. 5 is an outline view of the water turbine of the present invention.

Fig. 6 is a schematic diagram of the axial cross-sectional structure of the water turbine of the present invention.

Fig. 7 is an exploded schematic diagram of the structure of the hydraulic turbine components of the present invention.

Figure 8 is a schematic view of the axial cross-sectional structure of the water wheel of the present invention.

Fig. 9 is a schematic view of the axial cross-sectional structure of the transmission acceleration mechanism of the present invention.

Fig. 10 is a schematic diagram of the structure of the rotational atherectomy head of the present invention.

Fig. 11 is a schematic diagram of the structure of the rotary atherectomy wire-wound tube of the present invention.

Fig. 12 is a schematic view of the axial cross-sectional structure of the rotary atherectomy wire-wound tube of the present invention.

Fig. 13 is a cross-sectional view of the rotary atherectomy wire-wound tube of the present invention.

Figure 14 is a schematic view of the structure of the rotary atherectomy head of the present invention (1).

Fig. 15 is a schematic diagram of the structure of the rotary atherectomy head of the present invention (2).

Figure 16 is a schematic view of the structure of the rotary atherectomy head of the present invention (3).

Figure 17 is a schematic diagram of the water inlet and outlet distribution of the housing assembly of the present invention.

Figure 18 is the right side view of Figure 17

Figure 19 is a schematic diagram of the structure of the water wheel rotor of the present invention.

Fig. 20 is a left side view of Fig. 19.

Figure 21 is a schematic diagram of the installation position of the water wheel of the present invention.

Fig. 22 is a left side view of Fig. 21.

Detailed ways

The present invention will be further described in detail below with reference to the drawings and embodiments. The rotational atherectomy device for intravascular calcification lesions of the present invention uses high-pressure liquid to impact the water wheel to convert kinetic energy into the mechanical energy of the water wheel rotation, and the rotating water wheel drives the transmission acceleration mechanism, so that the speed of the adjustable rotating grinding head can dredge or improve the human body Severely calcified or fibrotic atherosclerotic lesions in the peripheral and coronary arteries.

As shown in Figure 1, the rotational atherectomy device for intravascular calcification lesions of the present invention is provided with a constant pressure water pump, a water flow control valve, a hydraulic turbine and a rotary grinding head connected in sequence from the proximal end to the distal end. The hydraulic turbine consists of a water wheel and The transmission acceleration mechanism is connected and constituted.

The output liquid (water) pressure of the constant pressure water pump is not less than 50Mpa, and the rotational speed of the rotary grinding head is 70,000 to 150,000 rad/min. The operator adjusts the diameter of the output port of the water flow control valve according to the liquid pressure output by the constant pressure water pump and the rotational speed of the rotary grinding head required for the operation to control the outlet size of the water flow control valve to adjust the water flow control. The output liquid flow rate of the valve realizes the control of the rotational speed of the rotary grinding head at an appropriate value in the range of 70,000 to 150,000 rad/min.

As shown in Figure 2, Figure 3, Figure 4 and Figure 5, the water turbine consists of a water wheel (shown in the right part of Figure 2 and shown in Figure 4 and Figure 5) and a transmission acceleration mechanism (shown in the left part of Figure 2 and Figure 3) Connection composition.

As shown in Figures 6 and 7, the water wheel, the transmission acceleration mechanism and the rotational grinding head are coaxially connected.

As shown in FIG. 8, the water wheel is provided with a housing assembly 2, and a water wheel rotor 1 is coaxially arranged in the housing assembly 2.

The shell assembly 2 is provided with a cylinder, and the middle of the cylinder is connected to the other two cylinders with a diameter smaller than the cylinder along the radial direction. The axis of the vertical cylinder is distributed from 30° to 60°.

In this embodiment, the inner diameter of the cylinder can be selected to be 16-30 mm, and the outer diameter can be matched to be 18-34 mm, and the water inlet and outlet are arranged in the middle of the cylinder along the axial direction.

The water wheel rotor 1 is provided with a central shaft, and a through hole is opened along the axis of the central shaft. At least two blades are connected to the central shaft, the water wheel rotor 1 is installed in the housing assembly 2 and the axis of the central axis of the water wheel rotor 1 is coaxial with the axis of the cylinder of the housing assembly 2.

As shown in Figs. 19 and 20, in this embodiment, the blades are four pieces, the cross-section of which is L-shaped, and stainless steel is used. The short sides of the L-shaped blades are respectively connected to the central axis along the axial direction of the central axis, and the L-shapes face the same direction and are evenly distributed on the central axis along the circumferential direction. The maximum outer diameter of the water wheel rotor 1 can be selected from 15.8 to 29.8mm according to the inner diameter of different cylinders. The blade height is (the maximum outer diameter value of the water wheel rotor-the outer diameter of the central shaft)/2 = 3.7mm, the length of the blade is 13mm, and the central shaft The length is 15mm, the arc length of the maximum outer diameter of the water wheel rotor 1 (the long side of the L-shaped blade) is 2mm, and the blade thickness gradually becomes thinner from the end of the short side of the L-shaped to the end of the long side of the L-shaped, from 1.85mm to 0.9mm .

As shown in Figure 21 and Figure 22, the water wheel rotor 1 is installed in the housing assembly 2. The difference between the maximum outer diameter of the water wheel rotor 1 and the inner diameter of the housing assembly 2 is 0.2mm, and the water wheel rotor 1 is located in the housing assembly 2. In the center position, this structure can prevent the rotation of the water wheel rotor 1 in the housing assembly 2 from causing liquid cavitation.

Both ends of the central shaft of the water wheel rotor 1 are supported in the holes of the ring-shaped bearing assembly 5. The bearing assembly 5 is set in the cylinder of the housing assembly 2 via the bearing pressing plate 4. The bearing pressing plate 4 is in the shape of a cover with an open end. The part faces the blade. The cover end of the bearing plate 4 is provided with an annular sealing partition 3. An annular sealing groove is formed along the circumferential direction at the outer edges near the two ends of the central shaft of the water wheel rotor 1, and an annular waterproof rubber ring 8 is embedded in the sealing groove. The two sets of sealed partitions 3, bearing pressure plate 4, bearing assembly 5, waterproof rubber ring 8 and housing assembly 2 form a sealed cavity. The sealed cavity is the rotation area of the water wheel rotor 1. The sealed cavity makes the water wheel rotor 1 When the pressured liquid flushes the blades, the central shaft is driven to rotate.

An annular pressure plate 6 and a circular bottom plate 7 are provided at both ends of the water wheel rotor 1 to form the overall structure of the water wheel. Located outside the pressure plate 6 and the inner hole of the cylinder of the housing assembly 2 is an internal thread, which is used for threaded connection with the planet carrier gear assembly 11.

When the water wheel is working, the pressure liquid flows in from the water inlet, and after washing the blades, it flows out from the water outlet. By adjusting the size of the outlet of the water flow control valve, the water flow can be adjusted and the rotation speed of the central shaft of the water wheel rotor 1 can be controlled.

As shown in FIG. 9, the transmission acceleration mechanism is provided with a hexagonal shaft 9. The hexagonal shaft assembly 9 forms a detachable connection with the central axis of the water wheel rotor 1, and transmits the torsion force generated by the rotation of the central axis of the water wheel rotor 1 to the hexagonal shaft 9. A section of the shaft at one end of the hexagonal shaft 9 connected to the central axis of the water wheel rotor 1 has a hexagonal cross-section, and is detachably connected with the central axis through hole of the water wheel rotor 1 to form a hexagonal shape.

The shaft in the middle of the hexagonal shaft 9 is arranged in the inner hole of the flange bearing 10 and the bearing assembly 19 to form an intermittent fit with the flange bearing 10 and an interference fit connection with the bearing assembly 19. One end of the bearing assembly 19 is adjacent to one end of the flange bearing 10, and the other end of the flange bearing 10 is provided with a position-limited annular bearing protection baffle 18 and a circlip 17. The flange bearing 10 and the bearing assembly 19 are sleeved in the inner hole at one end of the planet carrier gear 11. The planet carrier gear 11 is cylindrical. The inner thread of the barrel forms a threaded connection. The other end of the planet carrier gear 11 is an internal thread.

The other end of the bearing assembly 19 and the planet carrier gear 11 are sequentially provided with a first-order planetary acceleration gear mechanism and a second-order planetary acceleration gear mechanism connected to its output end.

The first-order planetary acceleration gear mechanism is provided with a first-order planetary acceleration gear base plate 12, three first-order planetary acceleration gear shafts 20 and the first-order planetary acceleration gear 21 connected thereto, and a first-order planetary acceleration sun gear that meshes with the first-order planetary acceleration gear 21 13. The axial section of the bottom plate 12 of the first-order planetary acceleration gear is T-shaped, and its axial center through hole is connected with the other end of the hexagonal shaft 9, the small end faces the hexagonal shaft 9, and the end surface of the large end is provided with three uniformly distributed through holes, one One end of the first-order planetary acceleration gear shaft 20 is fixedly arranged in three uniformly distributed through holes, the other end of the first-order planetary acceleration gear shaft 20 is connected to a first-order planetary acceleration gear 21, and the three first-order planetary acceleration gears 21 mesh with a first-order The planetary acceleration sun gear 13, and the axis of the first-order planetary acceleration sun gear 13 is coaxial with the axial center through hole of the first-order planetary acceleration gear base plate 12. The shaft of the first-order planetary acceleration sun gear 13 outputs the speed after the first-order acceleration.

When the hexagonal shaft 9 rotates, it drives the first-order planetary acceleration gear bottom plate 12 to rotate, so that three first-order planetary acceleration gear shafts 20 evenly distributed on the first-order planetary acceleration gear bottom plate 12 rotate around the axis of the first-order planetary acceleration gear bottom plate 12, so that one The first-order planetary acceleration gear 21 connected to the first-order planetary acceleration gear shaft 20 rotates around the axis of the first-order planetary acceleration gear base plate 12 to drive the first-order planetary acceleration sun gear 13 meshed with the first-order planetary acceleration gear 21 to rotate, and output the speed.

The second-order planetary acceleration gear mechanism is provided with a second-order planetary acceleration gear base plate 22, three second-order planetary acceleration gear shafts 23 and their connected second-order planetary acceleration gear 24, and a second-order planetary acceleration sun meshing with the second-order planetary acceleration gear 24 Round 14. The axial section of the bottom plate 22 of the second-order planetary acceleration gear is T-shaped, and its axial center through hole is connected to the shaft of the first-order planetary acceleration sun gear 13, and the small end faces the first-order planetary acceleration sun gear 13, and the end face of the big end has three equal openings. One end of the second-stage planetary acceleration gear shaft 23 is fixedly arranged in three uniformly distributed through holes, and the other end of the second-stage planetary acceleration gear shaft 23 is connected with a second-stage planetary acceleration gear 24, three second-stage The planetary acceleration gear 24 meshes with a second-order planetary acceleration sun gear 14, and the axis of the second-order planetary acceleration sun gear 14 is coaxial with the axis of the first-order planetary acceleration sun gear 13. The shaft of the second-order planetary acceleration sun gear 14 outputs the speed after the second-order acceleration. The cross section of the output shaft connected to the second-order planetary acceleration sun gear 14 is hexagonal.

The first-order planetary acceleration sun gear 13 drives the second-order planetary acceleration gear bottom plate 22 to rotate, so that three second-order planetary acceleration gear shafts 23 evenly distributed on the second-order planetary acceleration gear bottom plate 22 rotate around the axis of the second-order planetary acceleration gear bottom plate 22, so that The second-order planetary acceleration gear 24 connected to the second-order planetary acceleration gear shaft 23 rotates around the axis of the second-order planetary acceleration gear bottom plate 22 to drive the second-order planetary acceleration sun gear 14 meshed with the second-order planetary acceleration gear 24 to rotate, and output the speed.

The output end of the second-stage planetary acceleration gear mechanism is provided with an annular lubricating oil baffle assembly 15. The lubricating oil baffle assembly 15 is provided with a cover plate 16 which forms a threaded connection with the inner thread of the other end of the planet carrier gear 11.

As shown in Figure 10, the rotational grinding head connected to the output end of the transmission acceleration mechanism is provided with a hexagonal hollow shaft. The connection structure is disassembled, and the other end of the hexagonal hollow shaft is welded and connected to one end of the rotary milling wire-wound tube.

As shown in Fig. 11, Fig. 12 and Fig. 13, the rotary atherectomy wire tube is formed by spirally winding at least two stainless steel wires. In this embodiment, there are three wires. The pitch of each spiral wire is P=0.5mm, and the outer diameter OD= 0.8255mm, inner diameter ID=0.495mm, stainless steel wire outer diameter d=0.165mm, helix angle α=11°, and the direction of rotation is right-handed. The stainless steel wire is spirally wound and shaped and heat-treated at a temperature of not less than 2000°C. It has excellent torsion transmission ability, good bending ability, and can pass the complicated bending conditions of blood vessels.

As shown in Figure 14, the other end of the rotary atherectomy wire tube is provided with a rotary atherectomy head. The rotary atherectomy head is sleeved near the distal end of the rotary atherectomy tube. connect. The axial section of the rotary atherectomy head is in the shape of a gourd, the small end of the gourd shape faces the distal end, and the axis of the rotary atherectomy wire tube coincides with the axis of the rotary atherectomy head. The rotational atherectomy head structure of this shape is suitable for the state of occlusion (clogging) of a large area of the blood vessel in the positive direction.

As shown in Figure 15, the axial cross section of the rotary grind head is a combination of trapezoid and rectangle. The bottom of the trapezoid coincides with the long side of the rectangle. The axial section of the rotary grind wire tube coincides with the rectangle. The upper outer edge of the cross-section coincides with the trapezoidal lower bottom of the rotary grinding head to form an eccentric rotary grinding head. The rotary atherectomy filament tube extends 2 to 3 cm from the distal end of the rotary atherectomy head. This shape of the rotational atherectomy head is aimed at the positive narrow and large-area occlusion (blockage) in the rotational atherectomy vessel, and is suitable for improving unilateral calcification of the vessel wall and vascular bifurcation calcification.

As shown in Figure 16, the distal end of the axial section of the rotary atherectomy head is in the shape of a gourd-shaped small end, and the small end of the gourd-shaped end faces the distal end. The larger outer diameter is the small end, and the first conical shape extends toward the proximal end along the axial direction. The large end of the first conical shape extends cylindrically, and the second conical shape extends along the proximal end with the cylindrical outer diameter as the large end. The two cone-shaped small ends are the third cone-shaped big ends, and the third cone shape extends along the proximal end. The length of the cylindrical shape is smaller than the axial length of the first cone shape. The outer edge of the lower part has the same outer diameter as the small end of the first conical shape to the large end of the third conical shape, making it an eccentric rotary grinding head. The rotational atherectomy head of this shape can not only clear the frontal narrowness, but also improve the calcified lesions on the blood vessel wall, and at the same time, the bifurcation lesions can be taken into consideration.

The invention converts the kinetic energy of the liquid into the mechanical energy of the rotation of the rotational atherectomy head, so that the rotational atherectomy removes or improves the condition of completely occluded lesions in the periphery or coronary artery. Compared with pneumatic and motor drive, fluid power can not only achieve the same rotational atherectomy effect, and enable the rotational atherectomy head to meet the high-speed requirements for treating lesions, but also reduce the transmission noise and reduce the transmission noise while realizing the high-speed rotation of the rotational atherectomy head. Due to the frictional heat retained in the human body caused by rotational atherectomy, the input of cooling and lubricating solutions to the human body is reduced, the metabolic burden of the human kidney is reduced, and the safety of the operation is improved.

The invention adopts a constant pressure water pump to make the output water pressure not less than 50Mpa, adjust the diameter of the output port of the water flow control valve, control the outlet size of the water flow control valve, and adjust the output liquid flow of the water flow control valve to drive the water wheel. The water flow energy is converted into mechanical energy. After the speed is increased by the transmission acceleration mechanism, the rotational speed of the rotary grinding head is controlled between 70,000 and 150,000 rad/min. The structure is simple, the cost is low, and the operation is safe and reliable.

Claims

A rotary atherectomy device for intravascular calcification lesions is provided with a rotary atherectomy head, which is characterized in that the rotary atherectomy head adopts a water pump to drive its rotation through a hydraulic turbine.
The rotary atherectomy device for intravascular calcification lesions according to claim 1, characterized in that: the water pump is a constant pressure water pump, the constant pressure water pump is connected to the rotary grind head through a water flow control valve and a water turbine, and the output liquid pressure of the constant pressure water pump Not less than 50Mpa, the rotational speed of the rotary grind head is 70,000～150,000 rad/min, adjust the output liquid flow of the water flow control valve, and control the rotational speed of the rotary grind head to a certain value in the range of 70,000～150,000 rad/min.
The rotational atherectomy device for intravascular calcification lesions according to claim 2, wherein the hydraulic turbine is formed by connecting a hydraulic wheel and a transmission acceleration mechanism.
The rotational atherectomy device for intravascular calcification lesions according to claim 3, wherein the water wheel, the transmission acceleration mechanism and the rotational atherectomy head are coaxially connected.
The rotational atherectomy device for intravascular calcification lesions according to claim 4, characterized in that: the water wheel is provided with a housing assembly (2), and a water wheel rotor (1) is coaxially provided in the housing assembly (2); The inner diameter of the cylinder of the shell assembly (2) is 16-30mm, and the outer diameter is 18-34mm. The middle of the cylinder is connected to the other two cylinders with a diameter smaller than the cylinder along the radial direction. The axis of the nozzle is perpendicular to the axis of the cylinder and is distributed at 30°-60°; the water wheel rotor (1) is provided with a central shaft, a through hole is opened along the central shaft axis, and at least two blades are connected to the central shaft.
The rotational atherectomy device for intravascular calcification lesions according to claim 4, wherein the transmission acceleration mechanism is a first-order planetary acceleration gear mechanism connected with a second-order planetary acceleration gear mechanism.
The rotational atherectomy device for intravascular calcification lesions according to claim 4, wherein the rotational atherectomy head is provided with a hexagonal hollow shaft, and one end of the hexagonal hollow shaft forms a detachable connection with the output shaft of the second-order planetary acceleration gear mechanism In the structure, the other end is connected to one end of the rotary atherectomy wire tube, and the other end of the rotary atherectomy wire tube is sleeved with a rotary grind head, and the rotary grind wire tube extends out of the rotary grind head.
The rotational atherectomy device for intravascular calcification lesions according to claim 7, wherein the axial section of the rotational atherectomy head is in the shape of a gourd, the small end of the gourd-shaped head faces the distal end, and the axis of the rotary atherectomy tube is connected to the axis of the rotary atherectomy tube. The axis of the grinding head coincides.
The rotational atherectomy device for intravascular calcification lesions according to claim 7, wherein the axial cross section of the rotational atherectomy head is a combination of trapezoid and rectangle, and the bottom of the trapezoid coincides with the long side of the rectangle, and the rotary atherectomy filament The axial section of the tube coincides with the rectangle, and the upper outer edge of the axial section of the rotary pulverized wire tube coincides with the lower bottom of the trapezoid of the rotary grind head to form an eccentric rotary grind head.
The rotational atherectomy device for intravascular calcification lesions according to claim 7, wherein the distal end of the axial section of the rotational atherectomy head is in the shape of a small end in a gourd shape, and the axis of the rotary atherectomy wire tube coincides with the axis of the gourd shape. , With the larger outer diameter of the small end of the gourd shape as the smaller end, the first conical shape extends toward the proximal end along the axial direction, the large end of the first conical shape extends cylindrically, and the larger end of the cylindrical outer diameter extends along the proximal end. Two cones, the second round small end is the third conical big end, and the third cone extends along the proximal end. The length of the cylindrical shape is smaller than the axial length of the first cone. The lower part of the axial section of the rotary grinding head Cut off along the axial direction so that the outer edge of the lower part is the same as the outer diameter of the small end of the first conical shape to the large end of the third conical shape to form an eccentric rotary grinding head.