CN209863962U - Thrombus taking device - Google Patents

Abstract

The utility model discloses a get and tie device. This thrombectomy device is including getting a bolt rack and propelling movement seal wire, the propelling movement seal wire pass through connection structure with it connects to get a bolt rack, connection structure includes couple and loop-forming element be provided with the stop part on the couple, the loop-forming element is including the first ring and the second ring of intercommunication each other, the internal diameter of first ring is more than or equal to the external diameter of stop part, the internal diameter of second ring is less than the external diameter of stop part, when connecting, the couple at first gets into first ring, and the stop part passes first ring, then the couple gets into in the second ring, the couple with in the loop-forming element one with the propelling movement seal wire is connected, another with it connects to get a bolt rack.

Description

Thrombus taking device

Technical Field

The utility model relates to an intervene treatment facility technical field, more specifically relates to a get and tie device.

Background

The incidence of stroke in China is very high. The stroke has the characteristics of high fatality rate, high disability rate and high recurrence rate, seriously threatens the life and health of people in China, and brings heavy economic burden to families and society. Acute Ischemic Stroke (AIS) is one of the most common types of stroke. The key point of AIS treatment is to open an occluded blood vessel as soon as possible and save an ischemic penumbra.

At present, the clinical treatment of cerebral arterial thrombosis mainly adopts mechanical thrombus removal. The mechanical thrombus taking is to convey the thrombus taking device to the position of lesion, grasp the thrombus by the thrombus taking device and take out the thrombus from the body.

However, the connection between the thrombus-taking net rack and the pushing guide wire of the existing thrombus taking device is not firm enough, and the thrombus-taking net rack is easy to loosen and even fall off.

Therefore, a new technical solution is needed to solve the above technical problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a new technical scheme of thrombectomy device.

According to an aspect of the present invention, a thrombectomy device is provided. This thrombectomy device is including getting a bolt rack and propelling movement seal wire, the propelling movement seal wire pass through connection structure with it connects to get a bolt rack, connection structure includes couple and loop-forming element be provided with the stop part on the couple, the loop-forming element is including the first ring and the second ring of intercommunication each other, the internal diameter of first ring is more than or equal to the external diameter of stop part, the internal diameter of second ring is less than the external diameter of stop part, when connecting, the couple at first gets into first ring, and the stop part passes first ring, then the couple gets into in the second ring, the couple with in the loop-forming element one with the propelling movement seal wire is connected, another with it connects to get a bolt rack.

Optionally, a channel is formed between the first ring and the second ring, the channel having a width less than the diameter of the hanger.

Optionally, the first ring and the second ring intersect to form a mouth at the intersection, the mouth having a width less than the diameter of the hook.

Optionally, the stop is metal, plastic, rubber or silicone.

Optionally, the stop is formed on the hook by laser welding.

Optionally, the stop is formed on the hook by injection molding.

Optionally, a protective tube is sleeved outside the connecting structure.

Optionally, a filler is injection molded in the protection tube.

Optionally, at least one of the hook and the loop is made of a developer material.

Optionally, an outward bend is provided at the apex of the hook.

According to one embodiment of the disclosure, the connection strength between the pushing guide wire and the thrombus removal net rack of the thrombus removal device is high.

Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments of the invention, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.

Fig. 1 is a schematic diagram of a embolectomy rack, according to one embodiment of the present disclosure.

Fig. 2 is a schematic diagram of a embolectomy rack according to another embodiment of the present disclosure.

Fig. 3 is a schematic structural diagram of a embolectomy device according to one embodiment of the present disclosure.

FIG. 4 is a schematic representation of a ring according to one embodiment of the present disclosure.

FIG. 5 is a schematic representation of another ring segment construction according to an embodiment of the present disclosure.

FIG. 6 is a schematic diagram of a hook configuration according to one embodiment of the present disclosure.

FIG. 7 is a schematic diagram of another hook configuration according to one embodiment of the present disclosure.

Fig. 8 is a schematic diagram of a third embolectomy rack, according to one embodiment of the present disclosure.

Fig. 9 is a schematic diagram of a fourth embolectomy rack, according to an embodiment of the present disclosure.

Description of reference numerals:

11: pushing the guide wire; 12: a thrombus taking net rack; 13: a connecting structure; 14: a first ring; 15: a second ring; 16: a closing-in part; 17: a channel; 18: introducing a sheath; 19: a stopper; 20: hooking; 21: a bending section; 22: a longitudinal gap; 23: a first side; 24: a second edge; 25: a developing material; 26: a raised structure; 27: and (5) a concave structure.

Detailed Description

Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: unless specifically stated otherwise, the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

According to one embodiment of the present disclosure, a thrombectomy rack 12 is provided. As shown in fig. 1, the embolectomy net holder 12 has a cylindrical structure. The embolectomy rack 12 comprises a plurality of grid cells connected together. The embolectomy rack 12 has a longitudinal gap 22 and first and second edges 23, 24 that define the longitudinal gap 22. The first edge 23 forms a plurality of raised structures 26. The second edge 24 defines a plurality of recessed features 27 corresponding to the configuration of the raised features 26. The first side 23 and the second side 24 are separated from each other means that the first side 23 and the second side 24 are not formed to be connected to each other. Thus, the distance between the first side 23 and the second side 24 can be adjusted in time according to the inner diameter of the blood vessel. For example, the shape of the raised structures 26 matches the shape of the recessed structures 27, or the recessed structures 27 can surround the raised structures 26. The raised structures 26 and the recessed structures 27 are located opposite one another. The raised structures 26 can be inserted into the recessed structures 27 as the embolectomy rack 12 is collapsed. Here, the contraction is not the contraction of the embolectomy stent 12 in the stored state, but the embolectomy stent 12 contracts as the inner diameter of the blood vessel becomes smaller in the expanded state.

As shown in fig. 1, the embolectomy net rack 12 has an open-loop structure and is in a net cage shape. The shape of the grid unit is a circular, oval, diamond or annular structure. The plurality of grid cells may be of the same or different configurations. Wherein, the grid units with different structures are connected together, which can effectively improve the bonding force between the thrombus extraction net rack 12 and the thrombus.

The embolectomy net frame 12 is made of memory material, such as memory alloy, memory polymer material, etc. This makes the thrombectomy net can adjust the degree of curling according to the size of the internal diameter of blood vessel is self-adaptation, in order to laminate with the inner wall of blood vessel. For example, the thinner the vessel, the more portions of the open loop structure where both sides are staggered with each other to reduce the outer diameter; the thicker the vessel, the less the portions of the open loop structure where the two sides are interlaced to each other to increase the outer diameter. The diameter of the open-loop structure can be adjusted in a self-adaptive mode so as to adjust the radial supporting force and reduce the damage to blood vessels.

Optionally, the memory alloy includes nickel-titanium alloy, nickel-cobalt alloy, copper-zinc alloy, gold-cadmium alloy, and the like. In preparation, first, a sheet of memory alloy is laser etched to form a plurality of grid cells connected together. The grid cells in various shapes can be formed according to actual needs by means of laser etching, and forming accuracy is high. The first and second sides 23, 24 of the material are then wound in opposite directions into a cylindrical configuration. In the stored state, the first side 23 and the second side 24 overlap to form a fine bar-like structure. After the external force is removed, the rod-like structure can return to the recovered shape, i.e. stretch into a cylindrical structure.

The memory polymer material comprises polynorbornene, styrene-butadiene copolymer, shape memory polyurethane, etc. For example, the grid cells are formed by injection molding or laser etching. The materials have good memory and can be contracted and released according to the size of the inner diameter of the blood vessel. The size of the longitudinal gap 22 varies with the inner diameter of the vessel.

In one example, the diameter of the memory material is 0.06mm or more. The memory material itself has a developing function within the size range, that is, can be developed by a radiation of a predetermined frequency. Such as X-rays. Thus, the operator can more easily view the position of the embolectomy rack during use.

In one example, the entirety of the longitudinal gap 22 is helical. The helically extending longitudinal gap 22 allows the first and second sides 23, 24 to be of greater length to more effectively contact the thrombus.

In addition, the spiral structure enables the first edge 23 and the second edge 24 to have a scraping effect on thrombus, and the thrombus removing effect is better.

According to one embodiment of the present disclosure, the embolic net support 12 is capable of piercing a thrombus by inserting the raised structures 26 of the first side 23 into the recessed structures 27 of the second side 24 when contracted. This makes the combining force of thrombectomy net rack 12 and thrombus stronger, and the snatching of thrombus is more firm, and the effect of thrombectomy is better.

In one example, as shown in FIG. 1, first side 23 and second side 24 each form a tooth-like structure. The teeth of the toothing of the first side 23 form a projection 26. The teeth of the second side 24 are formed with recesses 27 between adjacent teeth. The tooth-shaped structure enables the first edge 23 and the second edge 24 to be meshed together more effectively, so that the thrombus is punctured deeper by the thrombus extraction net rack 12, and the bonding force between the thrombus extraction net rack 12 and the thrombus is stronger.

For example, the teeth are zigzag teeth. One side of the tooth part of the Z-shaped tooth structure is parallel to the circumferential direction of the cylindrical structure, and the other side of the tooth part of the Z-shaped tooth structure forms an acute angle with the side, so that the structure has better piercing effect.

In one example, the first edge 23 and the second edge 24 each form an undulating linear structure. The peaks of the wavy line structure of the first side 23 form raised structures 26 and the valleys of the wavy line structure of the second side 24 form depressed structures 27. The edges of the tooth-like structure are more gradual. The contact area of the convex structures 26 and the concave structures 27 is large, and the clamping effect on thrombus is more remarkable.

Of course, the convex structures 26 and the concave structures 27 are not limited to the above-described embodiments. The raised structure 26 may be semi-circular, square, etc. as long as it can pierce the thrombus and improve the binding force between the thrombus taking net rack 12 and the thrombus.

In one example, as shown in fig. 2, 8 and 9, the entire cylindrical structure is formed with a diameter-variable structure along the longitudinal direction. Compared with the drift diameter structure, the contact area between the reducing structure and the inner wall of the blood vessel is smaller, and the injury to the blood vessel is smaller.

In addition, when the thrombus taking net rack 12 is pulled outwards, the thrombus intercepting effect of the thrombus taking net rack 12 with the reducing structure is more obvious, and the thrombus can be effectively prevented from falling off.

For example, as shown in fig. 2, the reducing structure is a bead-like structure. The structure is contoured to resemble a plurality of spheroids strung together. The contact area of the bead-shaped structure and the thrombus is larger, so that the combining force of the thrombus taking net rack 12 and the thrombus is stronger.

For example, the inner diameter of the cylindrical structure is configured to gradually increase from the distal end to the proximal end. Proximal refers to the end closer to the operator and distal refers to the end further from the operator. This arrangement allows the thrombectomy rack 12 to effectively contact both the exterior surface and the interior of the thrombus. When thrombus is taken, the thrombus taking net rack 12 has obvious interception function and good thrombus taking effect.

In one example, as shown in fig. 8, the inner diameter of the cylindrical structure is configured to gradually increase from the two ends of the embolectomy rack 12 to the middle. The overall structure of the embolectomy net rack 12 is similar to a spindle shape. This shape makes the thrombus-catching net frame 12 have a good effect of catching the thrombus, and the thrombus-catching net frame 12 has a small resistance to travel in the blood vessel, and can be taken out more smoothly at the time of thrombus-catching.

In one example, as shown in fig. 9, the entirety of the cylindrical structure forms a wavy line structure in the longitudinal direction. The wavy linear structure can be a drift diameter structure or a reducing structure. In the case of the drift diameter structure, the wavy linear structure can repeatedly rub against the thrombus when the thrombus extraction rack 12 is extracted, thereby separating the thrombus from the blood vessel. Thus, the thrombus can be more effectively taken out by the thrombus taking-out net frame 12.

Under the condition of the reducing structure, the thrombus taking net rack 12 not only can repeatedly rub thrombus, but also can effectively intercept the thrombus, thereby more thoroughly removing the thrombus.

According to another embodiment of the present disclosure, a thrombectomy device is provided. The thrombus removal device comprises an introducing sheath 18, a pushing guide wire 11 and a thrombus removal net rack 12. The embolectomy screen 12 is as previously described. One end of the push guide wire 11 is connected with the near end of the thrombus extraction net rack 12. Introducer sheath 18 is a tubular structure. The embolectomy rack 12 is compressed and housed within an introducer sheath 18.

For example, the wall of the introduction sheath 18 has a double-layer structure in which the inner layer is made of a polymer material such as Polytetrafluoroethylene (PTFE) or high-density polyethylene (HDPE), and the outer layer is made of a nylon elastomer (PEBAX), nylon, or polyester resin (PET). The double-layer structure of the introducing sheath 18 has higher structural strength.

The push guide wire 11 is used for pushing and pulling out the thrombus extraction net rack 12. The material used for manufacturing the push guide wire 11 includes nickel titanium alloy, stainless steel and other materials, which have good flexibility, ductility and reliability, and still have good strength and flexibility when being made into a filament.

The thrombus removal device has the characteristics of good thrombus removal effect and thorough thrombus removal.

In one example, as shown in fig. 3-7, the pusher wire 11 is connected to the embolectomy rack 12 by a connecting structure 13. The connecting structure 13 includes a hook 20 and a ring. A stopper 19 is provided on the hook 20. The annular element comprises a first ring 14 and a second ring 15 communicating with each other. The inner diameter of the first ring 14 is greater than or equal to the outer diameter of the stop 19 and the inner diameter of the second ring 15 is smaller than the outer diameter of the stop 19. The stopper 19 is, for example, metal, plastic, rubber or silicone. As long as it can form a fixed connection with the hook 20 and can effectively prevent the hook 20 from being unhooked.

It is possible that, as shown in fig. 6, the stopper 19 is spherical, ellipsoidal, or the like, and the outer diameter is the diameter of a sphere or the length of the minor axis of an ellipsoid.

Alternatively, the stopper 19 may have only one dimension that is large and two other dimensions that are small. The dimension of the larger dimension is the dimension of the outer diameter. This dimension enables the stop 19 to be prevented from passing through the second ring 15.

When connecting, the hook 20 enters the first ring 14 first, and since the inner diameter of the first ring 14 is greater than or equal to the outer diameter of the stopper 19, the stopper 19 can pass through the first ring 14. The hook 20 then enters the second loop 15. Since the inner diameter of the second ring 15 is smaller than the outer diameter of the stopper 19, the stopper 19 cannot pass through the second ring 15, so that the hook 20 can be effectively prevented from being unhooked. One of the hook 20 and the ring is connected with the push guide wire 11, and the other is connected with the embolectomy net rack 12.

In this example, the connecting structure 13 is effective to form a secure connection to connect the embolectomy rack 12 to the pushwire 11.

In one example, as shown in fig. 4, a channel 17 is formed between the first ring 14 and the second ring 15. The width of the channel 17 is less than the diameter of the hook 20. The diameter of the hook 20 refers to the diameter of the wire from which the hook 20 is made. Since the width of the passage 17 is smaller than the diameter of the hook 20, the passage 17 can effectively prevent the hook 20 from entering the first ring 14 from the second ring 15. The hooks 20 can be confined within the second loop 15, effectively preventing the hooks 20 from unhooking.

In another example, as shown in FIG. 5, the first ring 14 and the second ring 15 intersect. A mouth 16 is formed at the position of the intersection. The width of the mouth 16 is less than the diameter of the hook 20. In this arrangement, the necked-in portion 16 is also effective to prevent the hooks 20 from entering the first loop 14 from the second loop 15.

Furthermore, such a ring is simpler to machine and less bulky than the channel 17.

The stopper 19 may be formed in various ways. The stopper 19 is formed on the hook 20 by laser welding, for example. The stop 19 is a solidified bead.

It is also possible to form the stop 19 on the hook 20 by means of injection moulding. The stop member 19 is a spherical plastic, rubber or silicone member.

In one example, a protective tube is provided around the connecting structure 13. The protective tube limits the activity between the hook 20 and the annular part, so that the embolectomy net rack 12 keeps a set posture when being taken out, and local swing is prevented.

Furthermore, the protective tube can effectively protect the hook 20 and the ring member and prevent the connecting structure 13 from scratching the blood vessel.

Preferably, a filler is injection molded into the protective tube. The protection tube can effectively protect the connection structure 13. For example, the protective tube is made of metal, plastic, ceramic, or the like. The protection tube is internally provided with a round hole, a square hole, a flat hole and the like. The filling material is polymer material such as plastic, rubber or silica gel. The injection molding mode can make the filler effectively fill the gap in the protective tube. The fill material effectively prevents the hooks 20 from moving, which allows for more accurate pushing and pulling of the embolectomy rack 12.

In addition, the packing material can more effectively prevent the hooks 20 from entering the first ring 14 from the second ring 15.

In one example, at least one of the hook 20 and the loop is made of a developer material. The developing material is a material that can be developed under irradiation of radiation (e.g., X-ray). This arrangement makes it easier for the operator to see the position of the embolectomy rack 12. For example, the developing material includes at least one metal material of platinum, tungsten, bismuth, and barium, or an alloy material of the above-mentioned at least two metal materials, or a polymer material to which the above-mentioned at least one element is added.

In one example, as shown in FIG. 8, a visualization material 25 is provided at the distal end of the thrombectomy rack 12. The developing material 25 is as previously described. This arrangement makes it easier for the operator to view the position of the embolectomy rack 12.

In one example, as shown in fig. 7, an outward bend 21 is provided at the apex of the hook 20. The bent portion 21 can play a role of a stopper when the hook 20 enters the second ring 15. The part of the second loop 15 snaps into the fold 21, which makes the relative position of the hook 20 and the loop more accurate.

Although certain specific embodiments of the present invention have been described in detail by way of example, it should be understood by those skilled in the art that the foregoing examples are for purposes of illustration only and are not intended to limit the scope of the invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims (10)

1. The utility model provides a thrombectomy device, wherein, including thrombectomy rack and propelling movement seal wire, propelling movement seal wire pass through connection structure with thrombectomy rack connects, connection structure includes couple and loop forming element be provided with the stop member on the couple, the loop forming element is including the first ring and the second ring of intercommunication each other, the internal diameter of first ring is more than or equal to the external diameter of stop member, the internal diameter of second ring is less than the external diameter of stop member, when connecting, the couple firstly gets into first ring, and the stop member passes first ring, then the couple gets into in the second ring, the couple with one in the loop forming element with the propelling movement seal wire is connected, another with thrombectomy rack connects.

2. The embolectomy device of claim 1, wherein a channel is formed between the first ring and the second ring, the channel having a width that is less than a diameter of the hook.

3. The embolectomy device of claim 1, wherein the first and second rings intersect to form a mouth at the location of the intersection, the mouth having a width that is less than the diameter of the hook.

4. The embolectomy device of claim 1, wherein the stop is metal, plastic, rubber, or silicone.

5. The embolectomy device of claim 1, wherein the stop is formed on the hook by laser welding.

6. The embolectomy device of claim 1, wherein the stop is formed on the hook by injection molding.

7. The embolectomy device of claim 1, wherein a protective tube is sleeved over the connecting structure.

8. The embolectomy device of claim 7, wherein a filler material is injection molded within the protective tube.

9. The embolectomy device of claim 1, wherein at least one of the hook and the ring is fabricated from a developer material.

10. The embolectomy device of claim 1, wherein an outward bend is provided at the apex of the hook.