CN112190306A

CN112190306A - Forceps for partially removing aortic valve leaflets

Info

Publication number: CN112190306A
Application number: CN202011151526.1A
Authority: CN
Inventors: 黄健兵; 杨晓颜; 梅举; 丁芳宝; 汤敏
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-11-25
Filing date: 2020-11-25
Publication date: 2021-01-08

Abstract

The invention discloses a pair of forceps for cutting off a part of aortic valve leaflets for transcatheter intervention. The key points of the technical scheme are as follows: the pliers are divided into two parts of a pliers tail and a pliers head, and the pliers contain a control guide wire. The forceps tail is of a long catheter structure and internally comprises a guide wire guide cavity and a control wire guide cavity. The pincers tool bit adopts two to contain the design of the tool bit that can close of hollow U-shaped blade, contains in a tool bit lateral wall with the communicating guide wire chamber of pincers afterbody, contains the control wire chamber in the nearly midrange lateral wall of another tool bit, the control wire chamber of tool bit punches to the inboard before the distal segment blade initial part of tool bit is forward from the tool bit tail end for through control wire to offside tool bit. The cutter head is opened and closed by controlling the guide wire. When the two forceps knife heads are combined, the front U-shaped blade is used for shearing off and capturing tissues. The forceps can be used for cutting off part of aortic valve leaflets under the intervention of a catheter.

Description

Forceps for partially removing aortic valve leaflets

Technical Field

The invention relates to the technical field of medical instruments, in particular to a tool for partially removing aortic valve leaflets.

Background

Transcatheter artificial aortic valve implantation is a rapidly developing cardiac treatment technique in recent years, and provides treatment opportunities for many patients who cannot undergo traditional surgery, so that the patients can continue to live. Whether the patient can carry out the transcatheter artificial aortic valve implantation or not needs to strictly evaluate the coronary artery risk of the patient, and in actual clinical work, 10% -20% of target people can not carry out the transcatheter artificial aortic valve implantation because the overhigh autologous aortic valve leaflet blocks the coronary artery opening after the operation, thereby losing the final treatment opportunity.

How to solve the coronary artery risk of the autologous aortic valve leaflet becomes the difficulty of the current transcatheter artificial aortic valve implantation. At present, no mature technology and apparatus which can directly solve the risk of the autologous aortic valve in the implantation of the transcatheter artificial aortic valve exist.

The invention aims to provide a tool for cutting off part of an aortic valve leaflet in transcatheter intervention, which is used for cutting off the part of the aortic valve leaflet which possibly obstructs the opening of a coronary artery, thereby providing an operation opportunity for a patient who cannot perform transcatheter artificial aortic valve implantation.

Disclosure of Invention

The invention provides a forceps for transcatheter intervention, which can cut off a part of aortic valve leaflets.

The pliers comprise two parts, namely a pliers tail part and a pliers head, wherein the pliers are internally provided with a control guide wire. The tail part of the forceps is of a round long catheter structure, and the forceps is internally provided with two guide wire cavities which penetrate through the whole length and are respectively used for guiding and controlling a guide wire. The forceps tool bit consists of two tool bits which can be folded and cut, one tool bit is fixedly connected with the forceps tail and internally provided with a guide wire guide cavity, and the distal end of the tool bit is provided with a U-shaped three-side blade; the other cutter head is movably connected with the fixed cutter head through a shaft, a control wire guide cavity is arranged on the cutter head, and a U-shaped three-side blade is arranged at the far end of the cutter head and corresponds to the blade of the fixedly connected cutter head. The cutter head is opened and closed by controlling the guide wire, tissues can be cut off when the cutter head is closed, and the cut tissues are stored in a cavity formed by the U-shaped blades.

The innovation points of the invention are as follows: the invention provides a tool capable of cutting off part of aortic valve leaflets under the intervention of a catheter, and fills the blank of the technology. The design of the U-shaped blade head of the invention provides a larger cutting width of the blade on the premise of keeping the smaller diameter of the blade head and ensuring better intervention trafficability, and not only cuts off the aortic valve leaflets, but also cuts off a valve tissue with enough width, thereby fully relieving the occlusion of the valve leaflet tissue on the coronary artery opening. The arrangement of the control guide wire of the invention can ensure that enough shearing force is realized under the condition of only using one joint. Meanwhile, due to the single-joint design, only the knife head part is opened and closed, and the damage of the knife body and the tail part to the vessel wall on the valve during operation is avoided.

As apparent from the above description of the present invention, the present invention aims to solve the problem of achieving transcatheter resection of a portion of an aortic valve leaflet. Filling the blank of the technology.

The invention designs a tool for cutting off a part of aortic valve leaflet in transcatheter intervention, which can cut off the overhigh part of the aortic valve leaflet blocking the opening of a coronary artery for a patient who cannot perform transcatheter aortic valve implantation because the aortic valve leaflet is overhigh, so that the patient can obtain the chance of operation.

Drawings

Fig. 1 is a cross-sectional view of the tail portion (1) of the pliers, taken along most of its length, before it transitions from the tail end to the nose end and is connected to the head of the pliers.

Figure 2 is a cross-sectional view of the tail (1) of the pliers near the connection with the head of the pliers where the tail transitions to an oblate shape similar to the head cross-section.

FIG. 3 is a sectional view of the beginning of the bit holder of the pliers (2a) fixed to the end of the pliers.

Fig. 4 is a sectional view of the position before the shaft, at the location where the shaft seats (3a, 3 b) on both the fixedly and movably connected cutter head are shown.

Fig. 5 is a sectional view at the position of the shaft (3 c).

Fig. 6 is a sectional view of the shaft, behind the shaft, showing the shaft seats (3a, 3 b) on both the fixedly and movably connected cutting head.

Fig. 7 is a sectional view of a portion between the shaft seat (3) and the middle section of the cutter body.

Fig. 8 is a sectional view of the middle section of the forceps head (2).

Fig. 9 is a cross-sectional view of the middle section of the forceps head near the beginning of the blade, with the control guide wire (4) passing through the movable head to the fixed head.

Figure 10 is a cross-sectional view of the blade portion of the jawset head.

Fig. 11 is a cross-sectional view of the tip (2a-3) of the cutting head (2a) fixedly attached to the tail of the pliers.

Fig. 12 is a side view of the bit (2) and partially attached tail (1).

FIG. 13 is a cross-sectional view along the long axis of the forceps, through the two guidewire lumens and through the center line of the two cutting tips.

Figure 14 is a schematic view of the cross-section shown in figures 1-11 in a position on the forceps.

Fig. 15 is a schematic view of the aortic root (5) near the aortic valve.

Fig. 16 is a schematic view of the forceps head (2) being delivered to the target aortic valve position.

FIG. 17 is a schematic view of the entire forceps being delivered to a target site via a peripheral vessel.

In the figure, each reference number indicates 1, a clamp tail part; 1a, guiding a guide wire cavity; 1b, controlling a guide wire cavity; 2. a tong cutter head; 2a, a cutter head fixedly connected; 2a-1, a guide wire cavity fixedly connected in the wall of the cutter head; 2a-2, a blade of a cutter head fixedly connected; 2a-3, the tip of the cutter head is fixedly connected; 2b, a movable tool bit; 2b-1, a control wire guide cavity in the outer side wall of the movable cutter head proximal section; 2b-2, a limit edge strip at the middle section of the movable tool bit; 2b-3, a blade of the movable cutter head; 3. a connecting shaft of the movable tool bit; 3a, a shaft seat positioned at the near section of the fixed tool bit; 3a-1, a hole which is positioned on the shaft seat of the fixed cutter head and used for passing through the shaft lever; 3b, a shaft seat positioned at the near section of the movable cutter head; 3b-1, a hole which is positioned on the movable tool bit shaft seat and used for passing through the shaft lever; 3c, a shaft lever; 4. controlling the guide wire; 5. aortic root schematic; 5a, aortic valve leaflets; 5b, coronary artery; 5c, aortic sinus; 6. a guide wire for guiding the forceps to the working site (prior art).

Detailed Description

The following description of the embodiments of the present invention refers to the accompanying drawings

Fig. 1 to 17 show a tool for transeptal intervention for excising a portion of an aortic valve leaflet of the present invention, and an example of use thereof.

Fig. 16 is a schematic view of the forceps head (2) being delivered to the target aortic valve position. The forceps for partially removing the aortic valve leaflets is shown, and comprises a forceps tail part (1), a forceps head (2) and a control guide wire (4), wherein the forceps tail part is of a round long catheter structure and internally provided with two guide wire cavities which penetrate through the whole length; the forceps head comprises two foldable tool heads containing U-shaped blades, one tool head (2a) is fixedly connected with the tail part of the forceps, and a cavity (2a-1) communicated with the tail part guide wire cavity is arranged in the wall; another tool bit (2 b) is a movable tool bit and is connected with the fixed tool bit (2a) through a shaft (3), and a control guide wire cavity (2 b-1) is arranged in the outer side wall of the middle section of the tool bit and is used for controlling the opening and closing of the tool bit through a control guide wire (4). The tail part (1) of the pliers is mainly of a circular conduit structure in the whole length, and is transited into a flat tube shape with the section similar to that of the tool bit before the head end is connected with the pliers tool bit; the tail part of the forceps is internally provided with two cavities (1a, 1 b) which run through the whole length and are respectively used for guiding and controlling a guide wire; the main body of the tail part of the forceps is made of a common catheter material which is available on the market, the diameter of the tail part of the forceps is 3-8 mm, the inner diameter of a guide wire cavity is about 1mm, and a common guide wire with the diameter of 0.89mm which is available on the market can pass through; the length of the tail of the forceps is 1-1.5 m. The pliers tool bit (2) comprises two tool bits which can be folded, and the front end of each tool bit comprises a U-shaped blade; a cutter head (2a) is fixedly connected with the tail part of the forceps, and the whole length of the cutter head penetrates through a cavity (2a-1) communicated with a guide wire cavity (1a) at the tail part of the forceps; the other cutter head (2 b) is a movable cutter head and is connected with the fixed cutter head (2a) through a shaft (3); a control guide wire cavity (2 b-1) is arranged in the outer side wall of the middle section near the movable cutter head (2 b) and used for controlling the opening and closing of the cutter head through a control guide wire to the inner side surface of the fixed cutter head (2a) on the opposite side and a control guide wire (4) in the control guide wire. The fixed cutter head (2a), the near-end and pincers afterbody (1) fixed connection, the total length of running through wire chamber (2a-1) is taken to the tool bit lateral wall internal zone, continues to link up with the guide wire chamber (1a) of pincers afterbody, and the nearly section of tool bit has the pedestal (3a) of axle, and the middle section is the entity, and the distant section is taken trilateral blade (2a-2), trilateral blade and middle section enclose into hollow cutter body. The tip (2a-3) of the tool bit is designed to be conical; the length of the cutter head (without the tip part) is 3-6 cm, the length of the blade part is 1-2.5 cm, the length of the distal tip (2a-3) part of the cutter head is 4-20 mm, and the cutter head is made of materials similar to common metal scissors. The near end of the movable cutter head (2 b) is connected with the fixed cutter head (2a) through a shaft (3), a control guide wire cavity (2 b-1) is arranged in the outer side wall of the middle-near section part of the cutter head, and a hole is formed in the control guide wire cavity from the tail end of the cutter head to the front end of the far section blade of the cutter head to the inner side of the control guide wire cavity and used for passing through a control guide wire (4) to the cutter head on the opposite side; the near section of the cutter head is provided with a shaft seat (3 b), the middle section is a solid body, two sides of the middle section are provided with limiting side strips (2 b-2) which are involuted with the middle section of the fixed cutter head, and the height of the limiting side strips is 1-3 mm; the remote section of the cutter head is provided with a three-side blade (2b-3), and the three-side blade and the middle section enclose a hollow cutter body; the three-side blade and the blade (2a-2) of the fixed cutter head (2a) are correspondingly opened and closed, so that tissues can be cut off and enclosed in the hollow cutter body; the length of the movable tool bit is 3-6 cm, and the length of the blade part is 1-2.5 cm; the maximum diameter of the two tool bits after involution is 4-8 mm, the outer sides of the tool bits are arc-shaped, and the tool bits can be conveyed to a target position through a common conveying sheath pipe on the market after being combined with a clamp tail; the vertex angle of the distal end of the cutter head is processed into an arc shape, and the cutter head is made of materials similar to common metal scissors. The movable cutter head connecting shaft (3) is composed of shaft seats (3a, 3 b) which are respectively positioned at the near sections of the fixed cutter head and the movable cutter head and are embedded with each other, holes (3 a-1, 3 b-1) are respectively drilled on the shaft seat body parts, and the shaft rod (3 c) penetrates through the holes, so that the cutter head can be opened and closed to move by taking the shaft rod as the center. The guide wire (4) penetrates through the control guide wire cavity (1 b) from the tail part of the clamp, penetrates through the control guide wire cavity (2 b-1) of the movable cutter head inwards from the middle section of the movable cutter head to the opposite fixed cutter head (2a), and the tail end of the guide wire is fixed on the inner side surface of the middle section of the fixed cutter head. The control guide wire is made of a common metal guide wire material on the market, and the diameter of the control guide wire can be set to be the same as that of a common guide wire, such as 0.89 mm. The length of the forceps is enough to be led out from a control guide wire cavity at the tail part of the forceps to be more than 10cm outside the tail part of the forceps. Its fixed tool bit (2a), according to the use needs, can increase the guide head of tapered at the end, be more convenient for through sheath pipe propelling movement to the target location. The guide wire cavity at the proximal section of the movable cutter head can be replaced by an elastic conduit attached to the outer side of the cutter head; the metal spring of the shaft can be added on the shaft part for assisting to strengthen the opening force of the movable cutter head.

The tool comprises a forceps tail and a forceps head part, and a control guide wire is arranged in the forceps. When the tool is used, a commercially available common guide wire is firstly used for establishing a passage through a femoral artery, the head end of the guide wire is placed into an aortic valve orifice, the guide wire passes through a guide wire cavity of the tool, and the whole device is guided to be sent to the position above the aortic valve orifice along the guide wire. After the forceps are placed above the aortic valve, the control guide wire is pushed, the movable cutter head is opened, the movable cutter head is rotated to the valve sinus direction of the target aortic valve leaflet, the forceps cutter head is downwards fed, the tail end of the movable cutter head is fed into the target aortic valve sinus, and the two cutter heads are respectively placed on two sides of the target aortic valve leaflet. After the accurate positioning is confirmed through esophagus ultrasonic and X-ray images, the control guide wire is pulled back, the two tool bits are occluded, the aortic valve leaflet at the target position is cut off, the cut valve leaflet is stored in the hollow tool body, and the forceps are withdrawn integrally to complete the cutting off and the taking out of part of the aortic valve leaflet.

The forceps are guided by the guide wire (6) to be sent to the aortic valve orifice, the forceps head is opened under the action of the control guide wire (4), the movable blade (2 b) is sent into the aortic sinus, and the blade part (2b-3) of the movable blade and the blade part (2a-2) of the fixedly connected blade are located on two sides of the target aortic valve (5 a).

FIGS. 1 to 11 are schematic cross-sectional views of the pliers from the tail to the head, and the corresponding positions of the cross-sections on the pliers are shown in FIG. 14

Fig. 1 is a cross-sectional view of the tail portion (1) of the pliers, taken along most of its length, before it transitions from the tail end to the nose end and is connected to the head of the pliers. The cross section is circular and solid, and the cross section of a guide wire cavity (1a) and a control guide wire cavity (1 b) are contained, wherein the control guide wire cavity (1 b) is provided with a cross section of a control guide wire (4).

Figure 2 is a cross-sectional view of the tail (1) of the pliers near the connection with the head of the pliers where the tail transitions to an oblate shape similar to the head cross-section. The cross section is mostly solid and contains the cross section of the guide wire cavity (1a) and the control guide wire cavity (1 b), wherein the control guide wire cavity (1 b) is provided with a cross section of the control guide wire (4).

FIG. 3 is a sectional view of the beginning of the bit holder of the pliers (2a) fixed to the end of the pliers. The shape of the front of the cutter head shaft seat fixedly connected can be seen, and the section of a cavity (2a-1) for guiding a guide wire can be seen at the lower part of the cutter head shaft seat. The control guide wire section is visible above.

Fig. 4 is a sectional view of the position before the shaft, at the location where the shaft seats (3a, 3 b) on both the fixedly and movably connected cutter head are shown. Showing two shaft seats (3a) on the fixedly connected cutter head, a shaft seat (3 b) on the movably connected cutter head, a cavity (2a-1) which is arranged at the lower part of the fixedly connected cutter head and passes through a guide wire, a cavity (2 b-1) which is arranged at the upper part of the movably connected cutter head and passes through a control guide wire, and a control guide wire (4) arranged in the cavity of the control guide wire.

Fig. 5 is a sectional view at the position of the shaft (3 c). It can be seen that the two shaft seats (3a) on the fixedly connected cutter head, the shaft seat (3 b) on the movably connected cutter head, and the shaft lever (3 c) passing through the two cutter head shaft seats. The lower part of the fixedly connected cutter head is provided with a cavity (2a-1) which is used for guiding a guide wire, the upper part of the movably connected cutter head is provided with a cavity (2 b-1) which is used for guiding a control guide wire, and the control guide wire cavity is internally provided with a control guide wire (4).

Fig. 6 is a sectional view of the shaft, behind the shaft, showing the shaft seats (3a, 3 b) on both the fixedly and movably connected cutting head. Showing two shaft seats (3a) on the fixedly connected cutter head, a shaft seat (3 b) on the movably connected cutter head, a cavity (2a-1) which is arranged at the lower part of the fixedly connected cutter head and passes through a guide wire, a cavity (2 b-1) which is arranged at the upper part of the movably connected cutter head and passes through a control guide wire, and a control guide wire (4) arranged in the cavity of the control guide wire.

Fig. 7 is a sectional view of a portion between the shaft seat (3) and the middle section of the cutter body. A gap is reserved between the two cutter heads. The lower part of the fixedly connected cutter head is provided with a cavity (2a-1) which is used for guiding a guide wire, the upper part of the movably connected cutter head is provided with a cavity (2 b-1) which is used for guiding a control guide wire, and the control guide wire cavity is internally provided with a control guide wire (4).

Fig. 8 is a sectional view of a solid portion of the middle section of the forceps head (2). The middle sections of the two tool bits (2a, 2 b) are solid. The two sides of the movable tool bit are provided with limit edgings (2 b-2). The cutter head body part fixedly connected is provided with a cavity (2a-1) through which a guide wire passes, the cutter head body part movably connected is provided with a cavity (2 b-1) through which a control guide wire passes, and the control guide wire cavity is internally provided with a control guide wire (4).

Fig. 9 is a cross-sectional view of the middle section of the forceps head near the beginning of the blade, with the control guide wire (4) passing through the active head to the fixedly attached head. The two sides of the movable tool bit are provided with limit edgings (2 b-2). The fixedly connected cutter head body part contains a cavity (2a-1) for guiding the guide wire. The inner side of the movably connected cutter head is provided with a control guide wire cavity (2 b-1) which is perforated to the inner side wall, a control guide wire (4) is arranged in the control guide wire cavity, and the tail end of the control guide wire is fixed to the cutter head (2a) at the opposite side.

Figure 10 is a cross-sectional view of the blade portion of the jawset head. The upper part is a movable cutter head (2 b), two sides of the clamp body of the cutter blade part of the movable cutter head are blades (2b-3), and the middle part is a hollow structure. The lower part is a cutter head (2a) which is fixedly connected, a cavity (2a-1) for guiding a guide wire is arranged in the outer side wall of the cutter head, the two sides of the cutter head are blades (2a-2), and the middle of the cutter head is a hollow structure.

Fig. 11 is a cross-sectional view of the tip (2a-3) of the cutting head (2a) fixedly attached to the tail of the pliers. The guide wire cavity (2a-1) can be seen in each section from the proximal tip. The tip is in a cone shape gradually shrinking towards the tail end.

Fig. 12 is a side view of the bit (2) and partially attached tail (1). Wherein the movable cutting head (2 b) is shown separately. The forceps tail (1) is continuously connected with the fixedly connected cutter head (2a), and a guide wire cavity (1a) of the forceps tail is continuously communicated with a guide wire cavity (2a-1) in the outer side wall of the fixedly connected cutter head. The position of a control guide wire cavity (1 b) of the forceps tail is opposite to that of a control guide wire cavity (2 b-1) in the outer side wall of the movable cutter head, and a control guide wire is not shown. The guidewire lumen is located within the forceps body and is shown in phantom as it would appear when projected internally in a side view of the forceps. The projection of the hollow blade body of the blade part is indicated by a dashed line. The near end of the fixedly connected cutter head is provided with a shaft seat (3a) which is mutually wedged with a shaft seat (3 b) at the near end of the movable cutter head, and corresponding parts of the shaft seats of the two cutter heads are respectively provided with a hole (3 a-1 and a hole (3 b-1) for penetrating through a shaft lever (3 c) to connect the two cutter heads. And two sides of the middle section of the movable tool bit are provided with limiting edgings (2 b-2). The distal ends of the two cutter heads are respectively provided with three side blades (2a-2 and 2b-3) distributed in a U shape. The tip (2a-3) of the fixedly connected cutter head is tapered towards the far end.

FIG. 13 is a cross-sectional view along the long axis of the forceps, through the two guidewire lumens and through the center line of the two cutting tips. The section of the midline part of the forceps tail (1) and the two forceps heads (2a, 2 b) is displayed. The forceps tail (1) is internally provided with a guide wire cavity (1a) and a control wire cavity (1 b), and the guide wire cavity (1a) is continuously communicated with a guide wire cavity (2a-1) in a cutter head (2a) fixedly connected. The control thread guide cavity (1 b) is opposite to the control thread guide cavity (2 b-1) in the movable cutter head. The control guide wire cavity is internally provided with a control guide wire (4), and the tail end of the control guide wire penetrates out of the inner side surface of the movable cutter head and is fixed on the inner side wall of the cutter head fixedly connected with the opposite side. The near end of the movable tool bit (2 b) is seen in the shaft seat (3 b), the shaft seat body is seen in the hole (3 b-1), and the shaft rod (3 c) is penetrated in the hole. The distal ends of the two cutting heads are seen as the distal portions (2a-2, 2b-3) of the U-shaped blades. The tip (2a-3) of the fixedly connected cutter head is conical.

Fig. 14 is a schematic view of the cross-section shown in fig. 1-11 in the position on the forceps, which is indicated by (r) - ⑪.

Fig. 15 is a schematic view of the aortic root (5) near the aortic valve. The figure shows the aortic valve leaflets (5 a), coronary arteries (5 b), aortic valve sinuses (5 c).

Fig. 16 is a schematic view of the forceps head (2) being delivered to the target aortic valve position. The cutter head (2a) and the movable cutter head (2 b) which are fixedly connected are respectively positioned at two sides of the target aortic valve leaflet (5 a).

FIG. 17 is a schematic view of the entire forceps being delivered to a target site via a peripheral vessel. The forceps head (2) is sent to the aortic root (5) from the forceps tail (1) along the guide wire (6) through the peripheral artery access.

The invention aims to provide a tool for cutting off part of aortic valve leaflets for transcatheter intervention, which is used for cutting off part of the overhigh aortic valve leaflets for patients who need transcatheter artificial aortic valve implantation for life treatment but cannot be operated because of the higher aortic valve leaflets, thereby obtaining operation opportunities and continuing lives.

The foregoing is only a preferred embodiment of the present invention and is not intended to limit the present invention in any manner. Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make numerous possible variations and modifications to the disclosed embodiments, or modify equivalent embodiments, without departing from the scope of the invention, using the teachings disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should fall within the protection scope of the technical scheme of the present invention, unless the technical spirit of the present invention departs from the content of the technical scheme of the present invention.

Claims

1. A forceps for partially removing aortic valve leaflets comprises a forceps tail part (1), a forceps head (2) and a control guide wire (4), wherein the forceps tail part is of a round long catheter structure and internally provided with two guide wire cavities which penetrate through the whole length; the forceps head comprises two foldable tool heads containing U-shaped blades, one tool head (2a) is fixedly connected with the tail part of the forceps, and a cavity (2a-1) communicated with the tail part guide wire cavity is arranged in the wall; another tool bit (2 b) is a movable tool bit and is connected with the fixed tool bit (2a) through a shaft (3), and a control guide wire cavity (2 b-1) is arranged in the outer side wall of the middle section of the tool bit and is used for controlling the opening and closing of the tool bit through a control guide wire (4).

2. The forceps for partially removing aortic valve leaflets as claimed in claim 1, wherein the tail portion (1) of the forceps has a substantially circular duct structure throughout its length, and transitions to a flat tube shape having a cross section similar to that of the forceps head before connecting the head portion to the forceps head; the tail part of the forceps is internally provided with two cavities (1a, 1 b) which run through the whole length and are respectively used for guiding and controlling a guide wire; the main body of the tail part of the forceps is made of a common catheter material which is available on the market, the diameter of the tail part of the forceps is 3-8 mm, the inner diameter of a guide wire cavity is about 1mm, and a common guide wire with the diameter of 0.89mm which is available on the market can pass through; the length of the tail of the forceps is 1-1.5 m.

3. The forceps for partially removing aortic valve leaflets as claimed in claim 1, wherein the forceps head (2) comprises two foldable cutting heads, each cutting head comprises a U-shaped blade at the front end; a cutter head (2a) is fixedly connected with the tail part of the forceps, and the whole length of the cutter head penetrates through a cavity (2a-1) communicated with a guide wire cavity (1a) at the tail part of the forceps; the other cutter head (2 b) is a movable cutter head and is connected with the fixed cutter head (2a) through a shaft (3); a control guide wire cavity (2 b-1) is arranged in the outer side wall of the middle section near the movable cutter head (2 b) and used for controlling the opening and closing of the cutter head through a control guide wire to the inner side surface of the fixed cutter head (2a) on the opposite side and a control guide wire (4) in the control guide wire.

4. The forceps for partially removing aortic valve leaflets as claimed in claim 3, wherein a cutting head (2a) is fixed, the proximal end is fixedly connected with a forceps tail (1), a guide wire cavity (2a-1) penetrating the whole length is formed in the outer side wall of the cutting head, the guide wire cavity is continuously communicated with a guide wire cavity (1a) at the forceps tail, a shaft bracket (3a) with a shaft is arranged at the proximal section of the cutting head, the middle section is a solid body, the three-sided cutting blade (2a-2) is arranged at the distal section, and the three-sided cutting blade and the middle section enclose a hollow cutter body; the tip (2a-3) of the tool bit is designed to be conical; the length of the cutter head (without the tip part) is 3-6 cm, the length of the blade part is 1-2.5 cm, the length of the distal tip (2a-3) part of the cutter head is 4-20 mm, and the cutter head is made of materials similar to common metal scissors.

5. The forceps for partially cutting off the aortic valve leaflet as claimed in claim 3, wherein the movable cutting head (2 b) has a proximal end connected to the fixed cutting head (2a) through a shaft (3), the proximal portion of the cutting head has a control guide wire chamber (2 b-1) in the outer side wall, the control guide wire chamber is perforated inward from the tail end of the cutting head forward to the start of the distal blade of the cutting head for passing through the control guide wire (4) to the opposite cutting head; the near section of the cutter head is provided with a shaft seat (3 b), the middle section is a solid body, two sides of the middle section are provided with limiting side strips (2 b-2) which are involuted with the middle section of the fixed cutter head, and the height of the limiting side strips is 1-3 mm; the remote section of the cutter head is provided with a three-side blade (2b-3), and the three-side blade and the middle section enclose a hollow cutter body; the three-side blade and the blade (2a-2) of the fixed cutter head (2a) are correspondingly opened and closed, so that tissues can be cut off and enclosed in the hollow cutter body; the length of the movable tool bit is 3-6 cm, and the length of the blade part is 1-2.5 cm; the maximum diameter of the two tool bits after involution is 4-8 mm, the outer sides of the tool bits are arc-shaped, and the tool bits can be conveyed to a target position through a common conveying sheath pipe on the market after being combined with a clamp tail; the vertex angle of the distal end of the cutter head is processed into an arc shape, and the cutter head is made of materials similar to common metal scissors.

6. The forceps for partially removing aortic valve leaflets as claimed in claim 3, wherein the movable blade connecting shaft (3) comprises shaft seats (3a, 3 b) embedded in the fixed blade and the movable blade, the shaft seats are respectively provided with holes (3 a-1, 3 b-1) through which the shaft rod (3 c) passes, so that the blade can open and close around the shaft rod.

7. The forceps for partially removing the aortic valve leaflets as claimed in claim 3, wherein the control guide wire (4) is inserted from the tail of the forceps through the control guide wire cavity (1 b), passes through the control guide wire cavity (2 b-1) of the movable cutter head, penetrates out from the middle section of the movable cutter head inwards to the opposite fixed cutter head (2a), and the tail end of the control guide wire is fixed on the inner side surface of the middle section of the fixed cutter head; the control guide wire is made of a common metal guide wire material which is on the market, and the diameter of the control guide wire can be set to be the same as that of a common guide wire, such as 0.89 mm; the length of the forceps is enough to be led out from a control guide wire cavity at the tail part of the forceps to be more than 10cm outside the tail part of the forceps.

8. The forceps for partially removing aortic valve leaflets as claimed in claim 3, wherein the fixed cutting head (2a) can be added with a tapered guiding head at the end to facilitate pushing to the target position through the sheath tube according to the use requirement.

9. The forceps for partially removing aortic valve leaflets as claimed in claim 3, wherein the guide wire lumen at the proximal section of the movable blade can be replaced by an elastic catheter attached to the outside of the blade; the metal spring of the shaft can be added on the shaft part for assisting to strengthen the opening force of the movable cutter head.