CN220213031U

CN220213031U - Vascular cutting device

Info

Publication number: CN220213031U
Application number: CN202323059691.6U
Authority: CN
Inventors: 张涵; 段志邦; 苗铮华
Original assignee: Shanghai Changde Medical Technology Co ltd
Current assignee: Shanghai Changde Medical Technology Co ltd
Priority date: 2023-11-14
Filing date: 2023-11-14
Publication date: 2023-12-22
Anticipated expiration: 2033-11-14

Abstract

The utility model relates to the technical field of medical appliances, and particularly discloses a vascular cutting device. The device comprises a handle assembly and a catheter assembly, wherein the handle assembly comprises a handle shell, the handle shell is provided with a containing groove extending along the working direction, and the catheter assembly comprises a cutting assembly, a protective sleeve and an inner tube assembly which can be selectively fixed on the handle shell; the inner pipe assembly part extends into the accommodating groove and can reciprocate along the working direction, and comprises an inner pipe extending along the working direction; the cutting assembly is sleeved on the outer side of the inner tube and comprises a cutting tube and a cutting component capable of being deformed in a telescopic way, the proximal end of the cutting tube is fixedly connected to the handle shell, and the two ends of the cutting component are elastically connected with the distal end of the cutting tube and the distal end of the inner tube; the protective sleeve part stretches into the accommodating groove and can reciprocate along the working direction, and comprises an outer tube sleeved on the outer side of the cutting assembly. The device is designed by means of the cutting part elastic connection inner tube and cutting tube, makes the automatic flexible cutting part produce deformation to realize stepless adjustment of the bulge diameter.

Description

Vascular cutting device

Technical Field

The utility model relates to the technical field of medical instruments, in particular to a vascular cutting device.

Background

In the medical field, there is a need for cutting and accessing peripheral blood vessels during surgery by medical staff. However, most of the existing blood vessel cutting devices on the market at present adopt a single form, one of the common blood vessel cutting devices is a wire saw, the other is a chain power saw, and the two blood vessel cutting devices have corresponding limitations on the working form and the working range because of the limitation on the form. The vascular cutting device has the following technical defects when in operation:

1) The bulge diameter of the cutting blade on the blood vessel cutting device is increased stepwise, and cannot be adjusted according to the diameter of the blood vessel;

2) The cutting sacculus on the vascular cutting device has a simple structure, the outer tube can not be fixed when the cutting device is withdrawn and exposed, and an operator needs to manually cooperate to control the vascular cutting device.

Therefore, there is a need for a new type of vascular cutting device that can change its form to cope with various different specifications of blood vessels.

Disclosure of Invention

The utility model aims to provide a vascular cutting device so as to realize automatic adjustment of the uplift diameter of a blade and facilitate the completion of self-adaptive cutting action adapted to the diameter of a blood vessel.

To achieve the purpose, the utility model adopts the following technical scheme:

the vascular cutting device comprises a handle assembly and a catheter assembly, wherein the handle assembly comprises a handle shell, a containing groove extending along the working direction is formed in the handle shell, and the catheter assembly comprises an inner tube assembly, a cutting assembly and a protective sleeve; the inner pipe assembly part extends into the accommodating groove and can reciprocate along the working direction, the inner pipe assembly can be selectively fixed on the handle shell, and the inner pipe assembly comprises an inner pipe extending along the working direction; the cutting assembly is sleeved on the outer side of the inner tube and comprises a cutting tube and a cutting component capable of being deformed in a telescopic mode, the proximal end of the cutting tube is fixedly connected to the handle shell, and the two ends of the cutting component are elastically connected with the distal end of the cutting tube and the distal end of the inner tube; the protection sleeve part stretches into the accommodating groove and can reciprocate along the working direction, the protection sleeve comprises an outer tube extending along the working direction, and the outer tube is sleeved outside the cutting assembly.

As a preferred embodiment of the vascular cutting device, the inner tube assembly further comprises a conical head, and the conical head is connected to the distal end of the inner tube; the proximal end of the cutting tube is fixedly connected with a fixing ring extending along the working direction, and the protective sleeve moving relative to the inner tube assembly is stopped by the protective sleeve and the conical head or the fixing ring.

As a preferred technical scheme of the vascular cutting device, the inner tube assembly further comprises a transmission unit, and the transmission unit is connected to the proximal end of the inner tube assembly; the handle assembly further comprises a roller rotatably connected to the handle housing, the roller part extends into the handle housing and is in transmission connection with the transmission unit, and the roller is used for driving the inner tube assembly to reciprocate along the working direction.

As the preferable technical scheme of vascular cutting device, the drive unit includes the edge the rack that the working direction extends, be equipped with in the storage tank perpendicularly the main shaft that the working direction extends, the gyro wheel cover is located the main shaft just around the axis rotation of main shaft, the handle subassembly still include with the gear that the gyro wheel coaxial links firmly, the gear with the rack meshing is connected, the gear is used for the drive rack reciprocating motion.

As the preferable technical scheme of the vascular cutting device, the rack is provided with a protruding block in a protruding mode, the protruding block extends out of the handle shell, a graduated scale is further arranged on the outer surface of the handle shell, and the protruding block is used for indicating the protruding diameter of the cutting part on the graduated scale.

As the preferable technical scheme of the vascular cutting device, the inner tube assembly further comprises a limit key, the limit key is detachably arranged on the handle shell, and the limit key arranged on the handle shell is in locking connection with the gear.

As the preferable technical scheme of the vascular cutting device, the cutting tube is elastically connected with the inner tube through an elastically deformable tubular member, the tubular member is sleeved outside the inner tube, and the cutting component is sleeved outside the tubular member.

As the preferable technical scheme of the vascular cutting device, the distal end of the inner tube is fixedly connected with a conical head, and two ends of the tubular piece are respectively connected with the cutting tube and the proximal end of the conical head.

As a preferable technical scheme of the vascular cutting device, the outer side wall of the outer tube is matched with the side wall of the accommodating groove; the protective sleeve further comprises a handle piece fixedly connected to the outer side wall of the outer tube, a long hole is formed in the side wall of the accommodating groove in a penetrating mode, the long hole extends along the working direction, and the handle piece penetrates through and extends out of the long hole.

As the preferable technical scheme of the vascular cutting device, the handle shell is formed by splicing the handle upper cover and the main shaft, and the opening of the accommodating groove is provided with a stress diffusion tube extending along the working direction.

The utility model has the beneficial effects that:

this vascular cutting device has reached the shielding purpose to cutting assembly through setting up protective sleeve's mode, has avoided the direct contact of cutting member and external environment, has avoided the accidental injury that the cutting member produced the cutting action when there is not the cutting demand, has reduced the risk of accidental injury, can control cutting assembly through the mode of adjusting protective sleeve position from this and start or stop the cutting action to the external world. The inner tube assembly can reciprocate along the working direction and is selectively fixed on the handle shell, so that the adjustment and fixation of the relative positions of the inner tube and the handle shell can be realized. The design of the cutting pipe and the inner pipe is elastically connected by the cutting component which is matched with the expansion deformation, so that the cutting component can expand and deform under the pulling of external force when the relative position of the inner pipe and the handle shell is not fixed, the deformation of the cutting component within a limited range is generated, and the bulge diameter of the cutting component is ensured to be capable of realizing self-adaptive adjustment. After the deformation of the cutting part, the expansion action of the part of the cutting part away from the axis of the inner tube can be stopped by the abutting of the cutting part and the outside, and the deformation amplitude of the cutting part is reduced due to the pulling of the cutting part by external force. Meanwhile, the force application condition of the cutting part during cutting is improved, the condition that the cutting force is too large is avoided, the excessive damage of the cutting part to the outside is avoided, the destructive power of the cutting part is reduced, the risk of irreversible damage caused by the cutting action is reduced, and therefore stepless diameter adjustment of the bulge diameter of the cutting part is achieved. When the relative positions of the inner tube and the handle shell are fixed, the relative positions of the two ends of the cutting part are determined, the cutting part can not deform due to external force at the moment, so that the deformation condition of the cutting part can be locked, namely, the bulge diameter of the cutting part can not be changed due to stress, the cutting action of the cutting part is not influenced by the external force, the cutting is accurate in place and the force application is consistent, the effect of the cutting action can be guaranteed under the conditions, the ineffective cutting action is effectively reduced, the repeated cutting condition is avoided, and the working efficiency is improved. According to the vascular cutting device, the cutting action can be adaptively adjusted according to the working conditions in a mode of switching between the two modes, the application scene is expanded, the cutting effect and safety are ensured, and the cutting action efficiency is improved.

Drawings

Fig. 1 is a schematic structural view of a vascular cutting device according to an embodiment of the present utility model;

FIG. 2 is a cross-sectional view of a vascular cutting device provided in an embodiment of the present utility model;

FIG. 3 is a partial cross-sectional view of a vascular cutting device provided in an embodiment of the present utility model;

fig. 4 is a partial cross-sectional view of a catheter assembly provided in an embodiment of the present utility model.

In the figure:

1. a catheter assembly; 10. a conical head; 11. an inner tube; 12. a connecting piece; 13. a tubular member; 14. cutting the tube; 15. a fixing ring; 16. an outer tube; 17. a handle member; 18. a tail end connector; 19. a cutting member;

2. a handle assembly; 21. a handle upper cover; 22. a handle lower cover; 23. a roller; 24. a main shaft; 25. a gear; 26. a rack; 261. a protruding block; 27. a limit key; 28. stress diffusion tube.

Detailed Description

The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," "proximal," "distal," and the like indicate an orientation or a positional relationship based on that shown in the drawings, merely for convenience of description and to simplify the description, and do not indicate or imply that the apparatus or elements to be referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first location" and "second location" are two distinct locations and wherein the first feature is "above," "over" and "over" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is level above the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

As shown in fig. 1 to 4, the present embodiment provides a vascular cutting device, which comprises a handle assembly 2 and a catheter assembly 1, wherein the handle assembly 2 comprises a handle shell, the handle shell is provided with a containing groove extending along the working direction, and the catheter assembly 1 comprises an inner tube assembly, a cutting assembly and a protective sleeve; the inner tube assembly part extends into the accommodating groove and can reciprocate along the working direction, the inner tube assembly can be selectively fixed on the handle shell, and the inner tube assembly comprises an inner tube 11 extending along the working direction; the cutting assembly is sleeved on the outer side of the inner tube 11 and comprises a cutting tube 14 and a cutting component 19 capable of being deformed in a telescopic way, the proximal end of the cutting tube 14 is fixedly connected to the handle shell, and the two ends of the cutting component 19 are elastically connected with the distal end of the cutting tube 14 and the distal end of the inner tube 11; the protection sleeve part stretches into the accommodating groove and can reciprocate along the working direction, the protection sleeve comprises an outer tube 16 extending along the working direction, and the outer tube 16 is sleeved outside the cutting assembly.

Specifically, one end of the cutting tube 14 away from the bottom of the accommodating groove is a distal end of the cutting tube 14, and one end of the cutting tube 14 close to the bottom of the accommodating groove is a proximal end of the cutting tube 14; one end of the cutting component 19, which is away from the bottom of the accommodating groove, is the far end of the cutting component 19, and one end of the cutting component 19, which is close to the bottom of the accommodating groove, is the near end of the cutting component 19; one end of the inner tube 11, which is away from the bottom of the accommodating groove, is the far end of the inner tube 11, and one end of the inner tube 11, which is close to the bottom of the accommodating groove, is the near end of the inner tube 11.

This vascular cutting device has reached the shielding purpose to cutting assembly through setting up protective sleeve's mode, has avoided cutting member 19 and external environment's direct contact, has avoided cutting member 19 to produce the accidental injury of cutting action when there is not the cutting demand, has reduced the risk of accidental injury, can control cutting assembly through the mode of adjusting protective sleeve position from this and begin or stop the cutting action to the external world. The inner tube assembly can reciprocate along the working direction and is selectively fixed on the handle shell, so that the adjustment and fixation of the relative position of the inner tube 11 and the handle shell can be realized. The design of elastically connecting the cutting tube 14 and the inner tube 11 by the cutting member 19 with telescopic deformation is matched, so that the cutting member 19 can be subjected to telescopic deformation under the pulling of external force when the relative positions of the inner tube 11 and the handle shell are not fixed, the deformation of the cutting member 19 within a limited range is generated, and the bulge diameter of the cutting member 19 is ensured to be capable of realizing self-adaptive adjustment. So as to ensure that after the deformation of the cutting member 19, the expansion action of the part of the cutting member 19 away from the axis of the inner tube 11 can stop the abutment of the cutting member 19 with the outside, and the pulling of the cutting member 19 by the external force can reduce the deformation amplitude of the cutting member 19, thus the improvement ensures that the cutting member 19 can smoothly cut the outside. Meanwhile, the force application condition of the cutting part 19 during cutting is improved, the condition that the cutting force is too large is avoided, the excessive damage of the cutting part 19 to the outside is avoided, the destructive power of the cutting part 19 is reduced, the risk of irreversible damage caused by the cutting action is reduced, and therefore stepless diameter adjustment of the bulge diameter of the cutting part 19 is achieved. When the relative positions of the inner tube 11 and the handle shell are fixed, the relative positions of the two ends of the cutting part 19 are determined, at the moment, the cutting part 19 can not deform due to external force, so that the deformation condition of the cutting part 19 can be locked, namely, the bulge diameter of the cutting part 19 can not be changed due to force, at the moment, the cutting action of the cutting part 19 is not influenced by the external force, the cutting is accurate in place and the force application is consistent, the effect of the cutting action can be ensured under the conditions, the ineffective cutting action is effectively reduced, the repeated cutting condition is avoided, and the working efficiency is improved. According to the vascular cutting device, the cutting action can be adaptively adjusted according to the working conditions in a mode of switching between the two modes, the application scene is expanded, the cutting effect and safety are ensured, and the cutting action efficiency is improved.

In this embodiment, the environment into which the catheter assembly 1 extends is a blood vessel, and the pressure applied is from the circumferential abutment of the vessel wall.

In this embodiment, the inner tube assembly further comprises a conical head 10 and a connecting piece 12, wherein the conical head 10 is connected to the distal end of the inner tube 11, and the connecting piece 12 is connected to the proximal end of the inner tube 11; a fixing ring 15 extending in the working direction is fixedly connected to the proximal end of the cutting tube 14, and the protective sleeve moving relative to the inner tube assembly is stopped against the conical head 10 or the fixing ring 15. Specifically, the conical head 10, the inner tube 11 and the connecting piece 12 are connected end to end in sequence in the working direction.

With the above arrangement, the range of variation of the relative positions of the inner tube assembly and the protective sleeve is limited, and the occurrence of the situation that the cutting member 19 cannot be smoothly exposed is avoided, thereby ensuring the smooth completion of the cutting action and ensuring the stable operation of the vascular cutting device. Meanwhile, the conical head 10 ensures the structural strength of the far end of the inner tube 11, ensures that the inner tube assembly can be smoothly in place, has the limiting effect due to the arrangement of the connecting piece 12, avoids the condition that the inner tube 11 is separated from the handle shell due to accidents, and ensures the smooth operation of the vascular cutting device.

Illustratively, the inner tube assembly further includes a drive unit coupled to the proximal end of the inner tube assembly; the handle assembly 2 further comprises a roller 23 rotatably connected to the handle housing, a portion of the roller 23 extending into the handle housing and being in driving connection with the transmission unit, the roller 23 being adapted to drive the inner tube assembly to reciprocate in the working direction. Through setting up the design that the part stretches into handle casing's gyro wheel 23, can make operating personnel accomplish the adjustment to the relative position of inner tube subassembly and handle casing through the mode of rotating gyro wheel 23, above adjustment mode is directly perceived reliable, easy dismounting and work efficiency are high, help improving operating personnel's use experience.

In one implementation of this embodiment, the transmission unit includes a rack 26 extending along the working direction, a spindle 24 extending perpendicular to the working direction is disposed in the accommodating groove, the roller 23 is sleeved on the spindle 24 and rotates around the axis of the spindle 24, the handle assembly 2 further includes a gear 25 coaxially and fixedly connected with the roller 23, the gear 25 is meshed with the rack 26, and the gear 25 is used for driving the rack 26 to reciprocate. In another implementation of the present embodiment, the transmission unit includes a worm, the roller 23 is connected with a worm wheel in a transmission manner, and the worm is meshed with the worm wheel in a transmission manner. Specifically, the end of the rack 26 is fixedly secured to the connector 12.

By means of the engagement transmission, the raised diameter of the cutting member 19 can be increased in a smaller size, the above driving mode can achieve fine adjustment of the raised diameter range, and the precise adjustment of the lifting cutting action is facilitated, so that the cutting effect of the vascular cutting device is improved, and the use experience of operators is improved.

In this embodiment, the bottom of the accommodating groove is fixedly connected with a tail end connecting piece 18 extending along the working direction, and the tail end connecting piece 18 penetrates through the inner tube 11, so as to play a role in guiding and supporting the inner tube assembly.

Further, a protruding block 261 is provided protruding on the rack 26, the protruding block 261 protrudes out of the handle housing, a scale is further provided on the outer surface of the handle housing, and the protruding block 261 is used for indicating the protruding diameter of the cutting member 19 on the scale. The bulge diameter of the cutting member 19 is equivalent to the maximum distance of the cutting member 19 from the center of the inner tube 11 after deformation, i.e. the distance of the maximum deformation of the cutting member 19 from the axis of the inner tube 11. The cooperation of protruding piece 261 and calibrated scale can instruct the relative position of inner tube subassembly and handle casing directly perceivedly, through the calculation to the data, is convenient for draw the relation between the relative position of uplift diameter and inner tube subassembly and handle casing to guaranteed to utilize the cooperation of calibrated scale and protruding piece 261, can accomplish the mark operation to uplift diameter. Operators can intuitively display the bulge diameter through observing the indication value, and can accurately grasp the bulge diameter through an intuitive feedback mode, so that the use experience is further improved. Considering that the withdrawal distance of the rack 26 has a certain linear relation with the bulge diameter of the cutting member 19, the operator can adjust the bulge diameter of the cutting member 19 according to the indicated value when cutting blood vessels of different diameters.

In this embodiment, the inner tube assembly further includes a limit key 27, the limit key 27 is detachably mounted on the handle housing, and the limit key 27 mounted on the handle housing is locked and connected to the gear 25. Specifically, the end of the limit key 27 is pressed against the gear 25. By means of the setting of the limit key 27, the design purpose of selectively fixing the inner tube assembly is achieved, the situation that the gear 25 is loose in the moving and guiding process in the operation is avoided, the rotation of the roller 23 caused by misoperation is limited, and the stable operation of the vascular cutting device is ensured.

Illustratively, the cutting tube 14 is elastically connected to the inner tube 11 by an elastically deformable tubular member 13, the tubular member 13 being sleeved outside the inner tube 11, and the cutting member 19 being sleeved outside the tubular member 13. Specifically, the tubular member 13 is a telescopic spring, and the cutting tube 14 is sleeved on the inner tube 11. With the help of the arrangement, the space occupied by the tubular member 13 is reduced, the structure of the catheter assembly 1 is optimized, the risks of position deviation and irreversible deformation of the tubular member 13 caused by accidents are reduced, the service life of the catheter assembly 1 is prolonged, and the stable operation of the vascular cutting device is further ensured.

Illustratively, the securing ring 15 is fixedly attached to the handle housing; the end of the conical head 10, which is away from the bottom of the accommodating groove, is the far end of the conical head 10, and the end of the conical head 10, which is close to the bottom of the accommodating groove, is the near end of the conical head 10.

Further, the tubular member 13 is connected at both ends to the cutting tube 14 and the proximal end of the conical head 10, respectively. The provision of the tubular member 13 at both ends thereof connected to the cutting tube 14 and the conical head 10, respectively, ensures that the elastic deformation of the cutting member 19 is only related to the relative positions of the inner tube assembly and the handle housing, thereby ensuring stable operation of the cutting assembly. The arrangement of the tubular member 13 connected to the proximal end of the conical head 10 enables the conical head 10 to provide a protective effect on the tubular member 13, reduces the risk of damage to the tubular member 13 and ensures smooth operation of the cutting assembly.

In this embodiment, the outer side wall of the outer tube 16 matches the side wall of the receiving groove; the protective sleeve further comprises a handle member 17 fixedly connected to the outer side wall of the outer tube 16, and an elongated hole is formed in the side wall of the accommodating groove in a penetrating manner, the elongated hole extends in the working direction, and the handle member 17 penetrates through and extends out of the elongated hole.

The setting of handle piece 17 makes operating personnel accomplish the withdrawal and the action that resets to protective sleeve through the mode of manually stirring handle piece 17, and need not operating personnel and carry out extra fixed action, and the degree of difficulty of operation has been reduced in above design, has improved the efficiency of vascular cutting device operation. Moreover, the cooperation of the handle member 17 and the elongated hole restricts the movable range of the protective sleeve, prolongs the risk of the protective sleeve being separated from the handle housing due to accidents, and ensures the smooth operation of the protective sleeve.

Illustratively, the handle housing is formed by splicing the handle upper cover 21 with the handle lower cover 22, and the opening of the accommodating groove is fitted with a stress diffusion tube 28 extending in the working direction. The split type design of handle upper cover 21 and handle lower cover 22 has reduced the processing degree of difficulty of handle casing, has reduced the manufacturing cost of handle casing, and the setting of the stress diffusion pipe 28 that extends along the direction of operation reduces the stress concentration of pipe assembly 1 near stress diffusion pipe 28, has reduced the risk that pipe assembly 1 takes place to buckle, has still guaranteed the connection stability of handle upper cover 21 and handle lower cover 22 simultaneously, has promoted the structural strength of handle assembly 2, has reduced the stress diffusion of handle casing.

The embodiment also provides a blood vessel cutting method, which is suitable for the blood vessel cutting device and comprises the following steps: the vascular cutting device is advanced under fluoroscopy to the target lesion of the vessel and then continued until the proximal end of the cutting member 19 is advanced completely past the target vessel cutting site. Pulling the grip member 17 in a direction toward the handle housing to retract the outer tube 16 fully exposes the cutting member 19 within the vessel lumen. Retracting the handle member 17 to be in registry with the securing ring 15 will fully expose the cutting member 19. The handle housing is held in one hand and the thumb of one hand of the operator is placed on the roller 23 and the other hand pulls the limit key 27 off the handle. After the limit key 27 is pulled off, the distal end of the cutting member 19 will have a force to spring back towards the handle housing, since the tubular member 13 is pretensioned against the inner layer of the cutting member 19. At this point the operator releases the thumb on roller 23 and the tubular member 13 rebounds causing the cutting member 19 to expand, the cutting member 19 coming into contact with the vessel wall. At this point the operator withdraws the vascular cutting device as a whole, and the diameter of the protuberance of the cutting member 19 will be freely variable during the withdrawal, depending on the diameter of the blood vessel, due to the presence of the tubular member 13. When the proliferated tissues and plaques which are difficult to cut are encountered, an operator can manually adjust the bulge diameter of the cutting component 19 by rotating the roller 23, then the limit key 27 is meshed with the gear 25, and the vascular cutting device is continuously retracted at the moment, the bulge diameter of the cutting component 19 is not changed any more, so that the purpose of forcefully cutting the blood vessel proliferation or plaques is achieved. When the cutting of the diseased vessel is completed, the roller 23 is rotated again to adjust the cutting member 19 to the initial position while the raised block 261 of the observation rack 26 indicates the minimum scale value. The handle member 17 is then pulled to bring the outer tube 16 over the other cutting members 19 until the outer tube 16 abuts the cone head 10 to indicate completion of the retrieval action of the cutting assembly. Finally, the whole vascular cutting device is withdrawn from the blood vessel, and the operation is completed.

It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims

1. Vascular cutting device, its characterized in that includes handle subassembly (2) and pipe subassembly (1), handle subassembly (2) include the handle casing, the storage tank that extends along the direction of operation has been seted up to the handle casing, pipe subassembly (1) include:

an inner tube assembly which partially extends into the accommodating groove and can reciprocate along the working direction, the inner tube assembly can be selectively fixed on the handle shell, and the inner tube assembly comprises an inner tube (11) extending along the working direction;

the cutting assembly is sleeved on the outer side of the inner tube (11), the cutting assembly comprises a cutting tube (14) and a cutting component (19) capable of being deformed in a telescopic mode, the proximal end of the cutting tube (14) is fixedly connected to the handle shell, and two ends of the cutting component (19) are elastically connected with the distal end of the cutting tube (14) and the distal end of the inner tube (11);

the protection sleeve part stretches into the accommodating groove and can reciprocate along the working direction, the protection sleeve comprises an outer tube (16) extending along the working direction, and the outer tube (16) is sleeved outside the cutting assembly.

2. The vascular cutting device according to claim 1, wherein the inner tube assembly further comprises a conical head (10), the conical head (10) being connected to the distal end of the inner tube (11); the proximal end of the cutting tube (14) is fixedly connected with a fixing ring (15) extending along the working direction, the protective sleeve can move relative to the inner tube assembly, and the protective sleeve is stopped on the conical head (10) or the fixing ring (15).

3. The vascular cutting device of claim 1, wherein the inner tube assembly further comprises a transmission unit connected to the inner tube assembly proximal end; the handle assembly (2) further comprises a roller (23) rotatably connected to the handle shell, the roller (23) partially stretches into the handle shell and is in transmission connection with the transmission unit, and the roller (23) is used for driving the inner tube assembly to reciprocate along the working direction.

4. A vascular cutting device according to claim 3, wherein the transmission unit comprises a rack (26) extending along the working direction, a main shaft (24) extending perpendicular to the working direction is arranged in the accommodating groove, the roller (23) is sleeved on the main shaft (24) and rotates around the axis of the main shaft (24), the handle assembly (2) further comprises a gear (25) coaxially and fixedly connected with the roller (23), the gear (25) is meshed with the rack (26), and the gear (25) is used for driving the rack (26) to reciprocate.

5. The vascular cutting device according to claim 4, wherein the rack (26) is provided with protruding bumps (261) protruding from the handle housing, the outer surface of the handle housing being further provided with a scale, the protruding bumps (261) being adapted to indicate the ridge diameter of the cutting member (19) on the scale.

6. The vascular cutting device according to claim 4, wherein the inner tube assembly further comprises a limit key (27), the limit key (27) being detachably mounted to the handle housing, the limit key (27) being mounted to the handle housing being lockingly connected to the gear (25).

7. Vascular cutting device according to claim 1, characterized in that the cutting tube (14) is elastically connected to the inner tube (11) by means of an elastically deformable tubular member (13), the tubular member (13) being arranged around the outside of the inner tube (11), the cutting member (19) being arranged around the outside of the tubular member (13).

8. The vascular cutting device according to claim 7, wherein the distal end of the inner tube (11) is fixedly connected with a conical head (10), and both ends of the tubular member (13) are respectively connected to the cutting tube (14) and the proximal end of the conical head (10).

9. The vascular cutting device according to claim 1, wherein the outer side wall of the outer tube (16) matches the side wall of the receiving slot; the protective sleeve further comprises a handle piece (17) fixedly connected to the outer side wall of the outer tube (16), an elongated hole is formed in the side wall of the accommodating groove in a penetrating mode, the elongated hole extends along the working direction, and the handle piece (17) penetrates through and stretches out of the elongated hole.

10. Vascular cutting device according to any one of claims 1-9, wherein the handle housing is formed by a handle upper cover (21) and a handle lower cover (22) joined together, and wherein the opening of the receiving slot is provided with a stress diffuser tube (28) extending in the working direction.