KR100478009B1 - Atherectomy catheter system with radially expanding cutter blades - Google Patents

Abstract

The present invention relates to a catheter used to remove the adhered plaque of the blocked inner wall of the blood vessel to restore the original blood vessel diameter when blood circulation disorder occurs due to occlusion of the blood vessel. And a control unit provided with a control switch and providing power required for rotation of the cutting unit. An injection unit installed at one side of the operation unit for bleeding air and injecting drugs; An adjusting unit for controlling the linear movement and the opening and closing operation, the expansion and contraction operation of the cutting unit; A tube device having a predetermined length of tubular body communicating with one side of the operation part and the injection part, having a plurality of tube shafts interposed therein, and a cutting part mounted at an end thereof; A cutting part provided with a cutting edge freely inserted into and out of the housing, the cutting edge being rotated while being pulled out by the control of the operation unit and the adjusting unit to remove foreign substances; By including, the cutting edge is inherent in the housing to protrude as needed, and the removed foreign matter is sucked into the interior of the housing to prevent the loss of foreign matter, the structure can be compact and compact The cutting edge of the cutting edge can be controlled to improve safety and convenience.

Description

Atherectomy catheter system with radially expanding cutter blades}

The present invention relates to a catheter used to recover the original blood vessel diameter by removing adherent plaque of the occluded blood vessel wall when blood circulation disorder occurs due to occlusion of blood vessels. Acerectomi catheter with a cutting edge that can be adjusted, prevents the removal of foreign substances removed, the structure is simple, the cutting edge can be controlled, the cutting edge is expanded in the radial direction for improved safety and convenience It is about.

Catheter is generally a medical conduit used to observe lesions in the human body, inject drugs, or dilate narrowed lumens. These catheters are used to treat diseases of various sites such as the heart, stomach, duodenum, and especially, to treat diseases of blood vessels such as veins and arteries.

Conventional Atherectomy catheters used to remove foreign substances in the inner wall of blood vessels are classified by cutting mechanism, power usage, and structural features. About 80% of cutting mechanisms are cut by blades. The rest is abrasive.

Also, about 80% of the cutting power is used to rotate the cutting edge using a motor or compressed air as a power source, and the rest is operated by manual (cut by hand pushing or pulling force).

Since the Acerlectomi catheter is connected to the cutting part and the power part by a soft tube having a length of about 1m, it is difficult to manually adjust the position of the cutting part and the magnitude of the cutting force at the same time in the case of the manual type, resulting in lower controllability than the motor or compressed air type .

On the other hand, in terms of efficiency of removing foreign matter (plaque) attached to the inner wall of the blood vessels, the inflatable or variable structure shows superior performance.

The expansion means that the diameter range of the cuttable can be adjusted from the outside, and when a small diameter cutting part is inserted into a blood vessel and then expanded to a large diameter at the surgical site, the cutting can restore a wide blood vessel diameter with a single procedure.

However, except for one type of commercially available Aerectomie catheter, the cutting part has a fixed size, so foreign substances outside the rotational radius of the cutting edge cannot be removed, so the removal efficiency is low and in some cases, small diameter to large Since the cutting edge of the diameter must be provided for each size, the burden of the cost increases.

In addition, the inflatable structure is more complicated because a mechanism for inflating the cutting part is added, which increases the possibility of causing problems in terms of manufacturing and assembling parts and operation of the device, which is very difficult to implement in hardware. Also occurs.

Catheters currently on the market can be broadly divided into three types: rotary, straight-forward and other, depending on their operation.

Foreign material removal methods include grinding grinding using grinding wheels, cutting using blades, and other high pressure liquid spraying methods, which are mainly used for laser or clot removal, but grinding and cutting methods are the most It is used a lot.

15A, 15B, and 15C illustrate one embodiment of such a conventional catheter.

Figure 15a is an Abrasive grinding catheter of Boston Scientific,

Rotating a rugby ball diamond burr 66 'at high speed (150,000-190,000 RPM) to make foreign matter 100' blocking the vessel 110 'into a fine powder that is washed by the bloodstream. I'm going.

However, in order to obtain a blood vessel diameter larger than the outer diameter of the grindstone, the grindstones of different sizes must be used in turn, which is cumbersome and time-consuming, and requires a separate device for driving an air turbine. There is an expensive disadvantage, and the disadvantage of low removal efficiency occurred in the soft plaque due to the characteristics of the grinding method.

15B is a cutting edge type catheter of InterVentional Technologies, Inc.

Conical cutting edge 66 '' is provided at the tip of the tip, and by removing the foreign material 100 '' in the vessel 110 '' by rotation (750 RPM) of the cutting edge, suction is applied by vaccum. Cut foreign matter was allowed to drain out of the tube.

15C is a catheter of a manual cutting edge method of Sherinemed Co., which cuts the foreign material 100 '' 'in the blood vessel 110' '' while the cutting edge 66 '' 'is unfolded and pulled back. As a result, there is a disadvantage that the foreign matter that is not completely closed or already removed when opening and closing the cutting edge can escape, in particular, there is a disadvantage that is not suitable for the removal of hard foreign matter because no power is used.

In addition to such a grinding or cutting method, a method using a laser has also been proposed, but it is used only in a special case and there is a risk of damaging a normal blood vessel wall.

Conventional catheter by the above-mentioned grinding or cutting is cumbersome and time-consuming because it has to work while replacing the cutting edge of different sizes or to change the cutting direction in order to cut the foreign material to the desired cutting radius, In the case of a manual expansion type catheter, foreign matters may come out or a cutting edge may not be accurately opened or closed.

In particular, according to the strength of the foreign material, the catheters must be selected according to the appropriate selection of the operation is complicated, there is a problem in that the cost burden increases by having several types of catheter.

Therefore, the present invention is devised to solve the problems of the prior art, the cutting edge is inherent in the housing, and if necessary, the cutting is performed while protruding, and the foreign matter removed to be sucked into the interior of the housing to lose the foreign matter Acerek has a cutting edge that expands in the radial direction, which can be prevented, the structure can be reduced in size, and the cutting edge can be controlled. The purpose is to provide a Tommy catheter.

The present invention to achieve the above object

An operation unit provided with a handle and a control switch which can be gripped by hand, and which provides power required for rotation of the cutting unit; An injection unit installed at one side of the operation unit for bleeding air and injecting drugs; An adjusting unit for controlling the linear movement and the opening and closing operation, the expansion and contraction operation of the cutting unit; A tube device having a predetermined length of tubular body communicating with one side of the operation part and the injection part, having a plurality of tube shafts interposed therein, and a cutting part mounted at an end thereof; A cutting part provided with a cutting edge freely inserted into and out of the housing, the cutting edge being rotated while being pulled out by the control of the operation unit and the adjusting unit to remove foreign substances; It is characterized by including the.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In the accompanying drawings, Figure 1 is a front view showing the configuration of the Acerlectomy catheter having a cutting edge expanding in the radial direction according to the present invention, Figure 2 is a cross-sectional view showing the structure of the operation unit in Figure 1, Figure 3 I-I cross-sectional view, Figure 4 is a cross-sectional view of the II-II in Figure 2, Figure 5 is a cross-sectional view showing the structure of the injection portion in Figure 1, Figure 6 is an exploded perspective view showing the structure of the cutting portion in Figure 1, Figure 7 8A and 8B are perspective views illustrating an operation of opening and closing a window of the cutting portion, FIGS. 9A and 9B are side cross-sectional views illustrating opening and closing operations of FIGS. 8A and 8B, and FIGS. 10A and 10B. 8 is a cross-sectional view showing the opening and closing operations of FIGS. 8A and 8B, FIGS. 11A and 11B are perspective views showing an operating state in which the cutting unit is expanded or contracted, and FIG. 12 is a cross-sectional view showing another embodiment of the cutting edge in the present invention; Figure 13 is a perspective view showing another embodiment of the cutting edge in the present invention, Figure 14 is a side view schematically showing an example of the operation of the Atherectomi catheter with a radially expanding cutting edge according to the present invention.

The drive unit 2 is a part for generating and transmitting a rotational power for rotating the cutting unit 6, as shown in Figures 2 and 3, the handle 230 to be gripped by hand A drive motor 27 in the main body 23 having

A first gear 220 meshed with the drive shaft of the drive motor 27 and a second gear 222 meshed with the first gear 220 are formed at one side of the outer circumference thereof, and the power tube shaft 7 is formed therein. And a reduction gear unit 22 including a gear shaft 24 having a window opening and closing shaft 8 coupled thereto,

A switch 26 is provided to control an on / off operation of the drive motor 27. The drive motor 27 is operated by operating the switch 26 while holding the handle 230. It is to transmit the rotational force to the power tube shaft (7) through the reduction gear unit 22 by turning on (off).

In the exemplary embodiment of the present invention, a 3V battery is used as a power source of the driving motor 27, and the rotational speed of the driving motor 27 is 25,000 RPM so that the rotational speed (no load) of the cutting part 6 is 1,100 to 1,200. RPM was set, and the gear reduction ratio of the reduction gear part 22 was 20: 1.

That is, the rotational speed of the drive motor 27 is reduced to 20: 1 through the reduction gear unit 22, and the power tube shaft 7 passing through the inside of the gear shaft 24 on which the second gear 222 is built up. Is passed on.

In this case, as shown in FIG. 3, the gear shaft 24 has a plurality of grooves 240 formed in a longitudinal direction on an inner side thereof, and a second gear 222 on one side of an outer circumference thereof. ) Is built up.

The power tube shaft 7 has a hollow portion 70 formed therein, and a slider 72 integrally fitted to the groove 240 on the outer surface thereof is integrally formed. (240) is fitted to be able to move straight along.

The injection unit 3 is installed at the front end of the operation unit main body 23, and the air filled in the inner space of each tube or shaft member before the cutting unit 6 is inserted into the blood vessel 110. It is used to remove or to inject the drug into the site if necessary.

5 is a cross-sectional view showing the structure of the injection part 3, a cylindrical body in which the power tube shaft 7 with the window opening and closing shaft 8 having a hollow portion 80 therein interposed therebetween is fitted therethrough. 30) and an injection port 32 having a through hole 320 is integrally formed at one side of the outer periphery of the cylinder 30 to inject a drug or to discharge air inside the power tube shaft 7.

At this time, by installing a one-way check valve 34 on one side of the injection port (32) to prevent the closed end of the injected drug back into the through-hole, the injection pipe connected to one end of the injection port (32) 322 is in communication with the first through-hole 72 formed on the outer periphery of the power tube shaft (7), and also by forming a second through hole (320) on one side of the outer periphery of the window opening and closing shaft (8) In communication with the hollow portion 80 of the drug to enable the flow.

As shown in the drawing, the O-rings 35 are mounted at both ends of the cylinder 30 to maintain the airtightness so that the injected drug does not leak to the outside.

As shown in FIG. 4, the adjustment unit 4 is installed on the other side of the operation unit 2 for the forward and backward operation of the cutting unit 6 and the control of the window opening and closing shaft 8. A puller (42) provided at an end of the power tube shaft (7) for moving the cutting part (6) forward and backward in an outer cylinder (44) having a long hole (440) on one side of the outer periphery; A push / pull handle 420 coupled to the access means 42 after fitting through the long hole 440, and a window opening / closing shaft 8 exposed through the outer cylinder 44. It consists of a window closer knob (82) attached to the end of the (window closer knob).

Here, the entry and exit means 42 has a fixed cap 424 attached to the end of the power tube shaft 7, a receiving cylinder 422 to which the fixed cap 424 is fitted inside, and the receiving cylinder ( It is made of a handle 420 is screwed to one side of 422, and as shown in Figure 11a and 11b by the forward and backward operation of the handle 420, the cutting portion 6 can perform the forward and backward movement To help.

The window opening knob 8 is for opening and closing the window closure 64 as shown in FIGS. 8A and 8B by pushing or pulling.

In addition, by tightening the handle 420 by turning in one direction, the receiving cylinder 422 and the outer cylinder 44 are fixed so that the cutting edge 66 is accompanied by the cutting edge 66 when the window opening knob 8 is pulled or pushed to move along the front and rear. Was prevented.

As shown in FIG. 1, the tube unit 5 is provided with a cutting part 6 at an end thereof and is connected to one end of the injection part 3 and has a flexible tube having a predetermined length. The structure is composed of the power tube shaft 7 and the entrance and exit tube shaft 9, the guide wire 65 in order to overlap the innermost of the housing tube 52 of the outermost.

That is, the housing tube 52 to prevent the blood vessel damage by preventing the rotating power tube shaft 7 in direct contact with the blood vessel inner wall;

The hollow portion 70 is formed inside, the first through-hole 72 is formed on one side of the outer periphery, the cutting portion 6 is installed at one end, the inlet and outlet means 42 is installed at the other end, the housing tube A power tube shaft 7 interposed in 52 to transmit the rotational force of the drive motor 27 to the cutting portion 6;

At one end, a window closure 64 and a fixed entry / exit tube holder 642 are installed, and at the other end, a window opening knob 82 is installed. The window closure 64 is interposed in the power tube shaft 7 to move the window closure 64 forward and backward. An entrance and exit tube shaft 9 to open and close the window hole 620;

A guide wire (65) interposed in the entry / exit tube shaft (9) for guiding the cutting portion (6) accurately to the treatment site; It is made to include.

Here, the inner tube is connected to the window opening and closing knob (8) and the entrance and exit tube shaft (9) for transmitting the force to open and close the window hole 620, the middle tube is the drive tube 27 as the power tube shaft (7) It transmits the rotational force of the cutting part.

And, the outermost housing tube (housing tube 52) serves to prevent damage to the vessel by preventing the rotating power tube shaft 7 is in direct contact with the vessel inner wall.

Conventional catheters vary depending on their use but are made using one or more tubes. The tube serves to remotely operate the cutting unit inserted into the human body and to transmit power from outside the human body, and the characteristics of the tube affect the user's operability.

In addition to the tube diameter profile, the tube design parameters must be designed to satisfy three conditions: pushability, torque capability, and flexibility.

In other words, it must have good longitudinal stiffness to push and pull remotely, and good torsional stiffness for good rotational force transmission, but also good flexibility to pass through the curved path.

The design parameters of the catheter tube are often incompatible with each other.

For example, a low profile and flexible tube reduces the risk of damage to the inner wall of the vessel, but reduces the rotational capacity, which is the ingress and torque transfer ability to push and pull the catheter.

On the contrary, if the accessibility or rotational ability is too high, the flexibility of the tube may be reduced.

Therefore, when designing a catheter tube, it is necessary to select these design variables well and to make a tube suitable for the purpose.

As a flexible material, various polymer tubes can be used. However, in the exemplary embodiment of the present invention, polyimide having excellent torsional and longitudinal stiffness is used to enter even a small diameter tube. Increased pushability and torqueability and increased resistance to flexibility and kink.

The side wall thickness of each tube was about 0.1 mm, and the tube inner diameter was coated with a low coefficient of friction Teflon (PTFE) coating to reduce the friction loss.

In addition, the fixing method between the tube and the parts to be assembled is based on the adhesion. At this time, in order to ensure sufficient adhesive strength, the surface treatment of the adhesive part and securing sufficient adhesion area should be considered in advance in the part design, and in particular, the part inserted into the human body. Nontoxic adhesives suitable for medical use should be used.

The guide wire 65 is for guiding the cutting part 6 accurately to the treatment part. The guide wire 65 pushes the guide wire 65 to a point slightly beyond the treatment part, and then cuts the cutting part 6. By moving along the guide wire 65, it can be accurately positioned at the treatment site.

The cutting unit (Blade) (6) is attached to the end of the power tube shaft (7) of the tube device to cut the foreign matter (Plaque) (100) accumulated in the vessel by the rotation of the cutting blade 66 9A and 9B, a housing 62 having a window hole 620 through which a cutting edge 66 enters and exits on one side of an outer circumference thereof, and a cutting inserted into the housing with one end fixed thereto, as shown in FIGS. A blade 66 and an incision hole 640 corresponding to the window hole 620 is formed at one side of the outer circumference thereof, and at one end, an entrance and end tube holder 642 fixed to the end of the entrance and exit tube shaft 9 is welded. And a window closure 64 inserted into the housing 62 so as to be fitted at the end of the cutting edge 66, and a tip for guiding entry of the housing 62 at the tip of the housing 62. A coil coil 63 is mounted.

Here, the cutting edge 66 is fixed to the blade holder 662, one end is fixed to the housing 62, the other end is bent to protrude in a "┏┓" shape to have a vertical side and a horizontal side blade portion ( As the elastic body having the 660 formed, the blade 660 is allowed to enter and exit the outside through the incision hole 640 and the window hole 620.

That is, the inclined surface 664 is formed on both vertical sides of the blade portion 660 so that the inclined surface is in contact with the upper end of the cutting hole 640 of the window closure 64, and when the window closure 64 is reversed When the upper end of the cutting hole presses the inclined surface 664, the blade part 660 may be retracted, and conversely, the window closure 64 may move forward and the blade part 660 may be positioned at the cutting hole 640. The blade portion 660 may be drawn out.

Therefore, the withdrawal and withdrawal operation of the cutting edge 66 is performed by the opening and closing operation of the window closure 64.

In the embodiment of the present invention, the cutting edge 66 is press-molded into a shape as shown in the figure using a stainless plate of about 0.1 mm thick, and the blade portion 660 drawn out from the window hole 620 of the housing 62. ), That is, the cutting radius can be produced differently depending on the diameter of the vessel and the degree of blockage, and is usually in the range of 0.5 mm to 1 mm.

12 shows another embodiment of the cutting edge 66a, in which a plurality of blade portions 660a are installed to face opposite sides of the blade holder, and the number of the blade portions 660a is the housing 62. Two cutting edges 66a are suitable because they must be inserted inside, and these cutting edges 66a store the cutting material more securely in the space inside the housing and debris than the single blade type cutting edge 66 with one blade. It is a safer structure because it is less likely to exit through the ball 620 again.

As shown in FIG. 6, the cutting edge 66 and the blade holder 662 need sufficient bonding strength to withstand the cutting force and the impact force applied to the cutting edge 66 during cutting, and thus the cutting edge 66. As a method of fixing the blade holder 662, laser welding or micro spot welding is suitable rather than bonding.

13 shows another embodiment of the cutting edge 66b. By forming the blade portion 660b into a sawtooth shape (or tooth-like shape) 660b, it is possible to cut hard foreign matter more effectively. Will be.

And, as shown in Figure 6, the window closer (64) (window closer) (64) mainly serves to draw out or retract the molded cutting edge 66 having elasticity through the window hole 620 of the housing 62 As a purpose, the entrance and exit tube holder 642 is joined to the rear end by spot welding.

That is, as shown in FIGS. 9A and 9B and 10A and 10B, the blade portion 660 is pulled out of the housing 62 or drawn into the housing 62 as the window closure 64 is moved forward or backward. do.

At this time, the withdrawal operation of the blade portion 660 is made by the elasticity of the shaped cutting edge 66, but when the blade portion 660 is withdrawn as shown in Figure 9a the entry tube holder 642 cutting edge 66 By supporting the middle portion of the bottom) has an additional function to prevent the blade portion 660 is pushed back into the housing 62 by the cutting load.

Referring to the operating relationship of the present invention configured as described above are as follows.

As shown in FIG. 14, the cutting part 6 is inserted along the guide wire 65 pre-inserted into the blood vessel 110 so that the cutting part 6 is immediately before the surgical site (a).

Thereafter, the handle 420 is advanced to position the cutting part 6 to pass through the blocked portion of the blood vessel 110. (b)

Thereafter, the window opening knob 8 is pushed forward to advance the window closure 64 so that the window hole 620 is opened, and the blade 660 is pulled out by elasticity.

Then, when the switch 26 of the operation unit 2 is turned on in the state in which the blade unit 660 is drawn out, the power tube shaft 7 rotates in one direction in association with the rotation of the driving motor 27. Accordingly, the cutting part 6 is rotated. (D)

Thereafter, the cutting part 6 is pulled backward, and cutting is performed by the rotating blade part 660. (e)

After the cutting is completed, the switch 26 of the operation unit 2 is turned off to stop the rotation of the cutting unit 6.

Thereafter, the window opening knob 8 is pulled back so that the window closure 64 is closed so that the window hole 620 is closed, and the drawn blade 660 is drawn back into the housing 62. (g)

Thereafter, the cutting part 6 is removed from the blood vessel 110 (h) to remove the foreign matter (plaque) 100 fixed to the inner wall of the blood vessel.

As described above, the Acerlectomi catheter having a radially expanding cutting edge according to the present invention allows the cutting edge is inherent in the housing and then protrudes when necessary, and the removed foreign matter is sucked into the interior of the housing. It is possible to prevent the loss of foreign matter, the structure is compact and can be miniaturized, and the entry and exit of the cutting edge can be controlled to provide the advantages of improved safety and convenience.

1 is a front view showing the configuration of an acerectomie catheter with a cutting edge expanding radially according to the present invention

2 is a cross-sectional view showing the structure of the operation unit in FIG.

3 is a cross-sectional view taken along the line I-I in FIG.

4 is a cross-sectional view taken along the line II-II in FIG.

5 is a cross-sectional view showing the structure of the injection unit in FIG.

Figure 6 is an exploded perspective view showing the structure of the cutting portion in Figure 1

FIG. 7 is a cross-sectional view of the cutting unit shown in FIG. 6.

8A and 8B are perspective views illustrating an operation of opening and closing a window of the cutting unit;

9A and 9B are side cross-sectional views illustrating the opening and closing operation of FIGS. 8A and 8B.

10A and 10B are cross-sectional views illustrating the opening and closing operation of FIGS. 8A and 8B.

11A and 11B are perspective views showing an operating state in which the cutting portion expands or contracts.

12 is a cross-sectional view showing another embodiment of a cutting edge in the present invention.

Figure 13 is a perspective view showing another embodiment of a cutting edge in the present invention

14 is a side view schematically showing an example of an operation of an acerectomie catheter having a radially expanding cutting edge according to the present invention;

15A, 15B, and 15C are side views of a conventional catheter

Explanation of symbols on the main parts of the drawings

2: operation unit 3: injection unit

4: adjusting part 5: tube device

6 cutting part 7 power tube shaft

8: Window opening and closing shaft 9: Entrance and exit tube shaft

22: reduction gear part 24: gear shaft

26: switch 27: drive motor

32: injection port 34: one-way valve

35: O-ring 30: cylinder

42: access means 44: external cylinder

52 housing tube 62 housing

63: tip coil 64: window closure

66: cutting edge 70, 80: hollow part

72: first hole 100: foreign matter

110: blood vessel 220: first gear

222: second gear 230: handle

240: groove 320: through hole

322 injection tube 420 handle

422: receiving cylinder 424: fixed cap

440: long 660: blade

662: blade holder 664: slope

65: guide wire

Claims (14)

An operation unit having a handle and a switch, the operation unit providing power required for rotation of the cutting unit; An injection unit installed at one side of the operation unit for bleeding air and injecting drugs; An adjusting unit for controlling the linear movement and the opening and closing operation, the expansion and contraction operation of the cutting unit; A tube device having a predetermined length of tubular body communicating with one side of the operation part and the injection part, having a plurality of tube shafts interposed therein, and a cutting part mounted at an end thereof; A cutting part provided with a cutting edge freely inserted into and out of the housing, the cutting edge being rotated while being pulled out by the control of the operation unit and the adjusting unit to remove foreign substances; Acerectomi catheter with a radially expanding cutting edge, characterized in that consisting of. The method of claim 1, The operation unit A drive motor installed inside the main body; A first gear meshed with the drive shaft of the drive motor, and a second gear meshed with the first gear on one side of the outer circumference, and a gear shaft having a power tube shaft and a window opening and closing shaft coupled therein. Wow; A switch for controlling an on / off operation of the drive motor; It is provided, and the acerectomi catheter having a cutting blade that expands in a radial direction, characterized in that the rotational force generated in the drive motor to be transmitted to the power tube shaft through the reduction gear. The method of claim 1, The injection portion has a hollow portion to be fitted while the power opening and closing shaft through which the window opening and closing shaft is interposed therebetween, and the injection port is provided with a through-hole so as to inject a drug on one side of the outer periphery or discharge the air therein The molded article is an ahretomyomy catheter having a cutting edge to expand in the radial direction, characterized in that it is installed on one side of the operation unit body. The method of claim 1, The control unit has an entrance and exit means inserted into the outer cylinder having a long hole on one side of the outer periphery while being installed at the end of the power tube shaft to advance the cutting unit; A handle engaged with the access means after being fitted through the long hole; The window opening knob is attached to the end of the window opening and closing shaft exposed through the outer cylinder; An ahretomy catheter having a cutting blade that expands in a radial direction, characterized in that the outer cylinder is provided on the other side of the operation portion for the forward and backward operation of the cutting portion and the opening and closing control of the window opening and closing shaft. The method of claim 1, The tube device A housing tube preventing the rotating power tube shaft from directly contacting the vessel inner wall to prevent vessel damage; The hollow part is formed inside, the first through hole is formed on one side of the outer periphery, the cutting part is installed at one end, the entrance and exit means is installed, the power interposed in the housing tube to transfer the rotational force of the drive motor to the cutting part A tube shaft; A window closure and a fixed entrance / exit tube holder at one end thereof, and a window opening knob at the other end thereof, and an entrance / exit tube shaft interposed in the power tube shaft to open and close the window hole by moving the window closure forward and backward; A guide wire interposed in the entry / exit tube shaft to guide the cutting part precisely to the treatment site; Acerectomi catheter with a cutting edge that extends in the radial direction, characterized in that made. The method of claim 1, The cutting unit and the housing is formed with a window hole for entering the cutting edge on one side of the outer circumference; A cutting edge inserted into the housing with one end fixed; A window closure formed at one end of the outer periphery corresponding to the window hole and inserted into the housing so that one end of the entrance and exit tube holder fixed to the end of the cutting edge is welded to one end of the cutting edge; A tip coil mounted at the front end of the housing to guide entry; It is included, Acerectomi catheter having a radially expanding cutting edge, characterized in that the foreign matter accumulated in the vessel by cutting the rotation of the rotation cutting edge while attached to the end of the power tube shaft. The method of claim 2, And the gear shaft has a radially expanding cutting edge, characterized in that a plurality of grooves are formed in the longitudinal direction on the inner side such that the power tube shaft can be fitted. The method of claim 2, The power tube shaft is a hollow portion is formed on the inner side, the outer surface is a cutting blade to expand in the radial direction characterized in that the slider is fitted to the groove of the gear shaft is integrally fitted so that the linear movement along the groove. Arthur Rectomy Catheter. The method of claim 3, The injection port is formed in the lower portion of the injection tube, on one side of the acerretomi catheter having a radially expanding cutting edge, characterized in that the one-way check valve is installed to prevent the flow back into the through hole. The method according to claim 2 or 5, The power tube shaft is formed with a first through-hole communicating with the injection tube, a second through-hole is formed on the outer peripheral side of the window opening and closing shaft so that the drug injected through the injection port flows into the power tube shaft and the window opening and closing shaft Acerlectomi catheter with a radially expanding cutting edge characterized in that. The method of claim 4, wherein The entrance and exit means is composed of a fixed cap attached to the end of the power tube shaft, and a receiving cylinder in which the fixed cap is fitted inside, so that the cutting unit is interlocked by the forward and backward operation of the handle screwed to one side of the receiving cylinder. On the other hand, the ahrettotomy catheter having a radially expanding cutting edge, characterized in that the receiving cylinder and the outer cylinder can be fixed by tightening the handle. The method of claim 6, The cutting edge is an elastic piece having one end fixed to the blade holder and the other end bent to protrude to have a vertical side and a horizontal side to have a blade portion. The cutting edge is inserted into the housing by entering and exiting by the forward and backward operation of the window closure. Acerectomi catheter with a radially expanding cutting edge, characterized in that the movement is made. The method of claim 12, The inclined surface is formed on both sides of the vertical side of the blade portion so that the inclined surface is in contact with one end of the cutout of the window closure, so that the cutout of the window closure is pulled in by pressing the inclined surface. Arthur Rectomy Catheter. The method of claim 13, Acerectomi catheter having a cutting edge to expand in the radial direction characterized in that the saw blade is formed on one side of the horizontal side of the blade.