CN115400321A

CN115400321A - Porous sheath core for assisting intracranial thrombus suction

Info

Publication number: CN115400321A
Application number: CN202210804149.XA
Authority: CN
Inventors: 朱宽; 王国辉; 王震; 李志刚
Original assignee: Weiming Medical Equipment Shanghai Co ltd
Current assignee: Weiming Medical Equipment Shanghai Co ltd
Priority date: 2022-07-07
Filing date: 2022-07-07
Publication date: 2022-11-29

Abstract

The invention discloses a porous sheath core for assisting intracranial thrombus suction, which comprises a handle, wherein one end of the handle is connected with a push wire, and the outside of the push wire is fixedly connected with a quick-crossing sheath core main body; the sheath core main body is provided with a plurality of groups of holes with gradually reduced and sparse apertures from the far end to the near end, and a metal reinforcing layer is arranged inside the near end of the sheath core main body. The device can adsorb the bits of broken glass to the trompil because the distal end of sheath core main part is provided with the multiunit trompil, simultaneously because the inside of sheath core main part also is the negative pressure, can make the thrombus combine together with sheath core main part more easily to supplementary pull thrombus.

Description

Porous sheath core for assisting intracranial thrombus suction

Technical Field

The invention relates to the technical field of medical devices, in particular to a porous sheath core for assisting intracranial thrombus suction.

Background

The cerebral apoplexy is one of common diseases in the world and is characterized in that: high morbidity, high morbidity and high disability rate. The annual incidence rate of the urban cerebrovascular diseases in China is 219/10 ten thousand, the annual incidence rate in rural areas is 185/10 ten thousand, and the annual incidence rate is increased year by year. The prevalence rate of cerebrovascular diseases is increased from 5.9 per thousand to 9.7 per thousand from 1998 to 2008. In patients with viable cerebrovascular disease, about three-quarters of the patients are incapacitated to different degrees. There are reports that 80% of stroke patients have varying degrees of limb dysfunction, of which 43.7% cannot take care of their lives.

rt-PA thrombolytic by intravenous injection is the only currently proven effective acute treatment for cerebral infarction. However, the intravenous thrombolytic therapy has long time, great damage to ischemic brain tissue and bleeding risk, and very low recanalization rate; the recanalization rate of basilar artery thrombolysis is only about 30%, the recanalization rate of lesion thrombolysis at the tail end of carotid artery is only 6%, and the recanalization rate of common carotid artery thrombolysis is only about 27%. And the time window for intravenous thrombolysis is only about 4 hours. From the above, the single use of venous thrombolysis for cerebral artery occlusion is far from sufficient, and the single use of venous thrombolysis may not be sufficient to meet the actual clinical requirements.

The mechanical thrombus extraction is to convey a thrombus extractor to a lesion position and then extract thrombus out of a body through a sheath tube, and the mechanical thrombus extraction comprises the following methods: the method has the advantages that thrombus removal is thorough, but the injury to the vascular wall is excessive, so that various complications are easily caused; the method has the advantages that the operation difficulty is high, the laser energy is ineffective when the laser energy is too low, the blood vessel is damaged when the energy is too high, and various inflammations are caused; although the operation is simple, the thrombus-capturing net cannot be used in intracranial stenotic vessels due to large volume, and the time consumption is relatively long.

The suction thrombus is a novel thrombus extraction means at present, the time from femoral artery puncture to reperfusion can be reduced, the overall operation time is shortened, the damage to the blood vessel wall is reduced, and the key of whether the head end of the suction catheter can reach the thrombus position in the blood vessel is successful in suction. Currently, the clinical use of suction embolus has become a mainstream embolus extraction method, but some problems also exist, such as the following:

1. the arrival rate of the suction catheter to the complex blood vessel is not high, namely the suction catheter cannot reach the position blocked by thrombus;

2. the aspiration catheter reaches the thrombus site, but due to the stiffness or size factor of the thrombus, the thrombus cannot be withdrawn;

3. when thrombus is sucked, the thrombus breaking device is used, and when the thrombus is broken, the thrombus at the far end of the thrombus blockage position is easy to escape.

Disclosure of Invention

The invention aims to solve the defects in the prior art and provides a porous sheath core for assisting intracranial thrombus suction.

In order to achieve the purpose, the invention adopts the following technical scheme: a porous sheath core for assisting intracranial thrombus suction comprises a handle, wherein one end of the handle is connected with a pushing wire, and the outside of the pushing wire is fixedly connected with a quick-crossing sheath core main body;

the sheath core main body is provided with a plurality of groups of holes with gradually reduced and sparse apertures from the far end to the near end, and a metal reinforcing layer is arranged inside the near end of the sheath core main body.

As a further description of the above technical solution: the opening is a conical opening, and the opening is circular or elliptical.

As a further description of the above technical solution: the connection part of the push wire and the sheath core main body is an oblique cut.

As a further description of the above technical solution: the push wire is welded with the metal reinforcing layer.

As a further description of the above technical solution: the proximal end of the sheath core main body further comprises an inner layer and an outer layer arranged outside the metal reinforcing layer, and the inner layer and the outer layer are arranged at the distal end of the sheath core main body.

As a further description of the above technical solution: the proximal end of the sheath-core body comprises the metal reinforcement layer and the outer layer, and the distal end of the sheath-core body comprises the outer layer.

As a further description of the above technical solution: the inner layer is made of PTFE materials, and the outer layer is made of high polymer materials.

As a further description of the above technical solution: the distal end of the sheath core main body is of a conical structure, and the length of the cone is 0.5-5cm.

As a further description of the above technical solution: the push wire and the metal reinforcing layer are both made of nickel titanium.

As a further description of the above technical solution: the outer layer is mixed with a developing material or is externally provided with a developing ring.

The invention has the following beneficial effects:

1. according to the invention, the push wire and the sheath core main body at the far end are pushed to enter thrombus by adjusting the handle, when the suction catheter sucks, the sheath core main body is a quick-crossing sheath core, the inside of the sheath core main body is provided with a larger cavity, and meanwhile, the push wire is connected with the side edge of the sheath core main body, so that the inner cavity of the suction catheter cannot be occupied, when the inner cavity of the suction catheter is in a negative pressure state, the inner cavity of the sheath core main body can also have a negative pressure state, meanwhile, as the far end of the sheath core main body is provided with a plurality of groups of openings, broken thrombus can be adsorbed into the openings, and meanwhile, as the inside of the sheath core main body is also in a negative pressure state, the thrombus can be easily combined with the sheath core main body, so that the thrombus is assisted to be pulled.

2. According to the invention, the sheath core main body is provided with the plurality of groups of the openings with gradually reduced and sparse apertures from the far end to the near end, so that the far end performance of the sheath core main body is represented as that the far end is soft and the near end is hard, and the sheath core main body can more easily pass through tortuous blood vessels to reach farther positions.

Drawings

FIG. 1 is a schematic view of a porous sheath core for assisting aspiration of intracranial thrombi according to the present invention;

FIG. 2 is a partial cross-sectional view of a porous sheath core for assisting aspiration of intracranial thrombi in accordance with the present invention;

fig. 3 is a schematic diagram of intravascular thrombus aspiration of a porous sheath core for assisting intracranial thrombus aspiration according to the present invention.

Illustration of the drawings:

1. a handle; 2. pushing the wires; 3. a sheath-core body; 31. a metal reinforcing layer; 32. an inner layer; 33. an outer layer; 4. opening a hole; 5. thrombosis; 6. a blood vessel.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance, and furthermore, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1-3, one embodiment provided by the present invention: a porous sheath core for assisting intracranial thrombus suction comprises a handle 1, wherein one end of the handle 1 is connected with a push wire 2, and the outside of the push wire 2 is fixedly connected with a quick-crossing sheath core main body 3;

the sheath core main part 3 is offered aperture from the distal end to the near-end and is reduced gradually and the multiunit trompil 4 of sparse gradually, make the sheath core main part 3 distal end performance show for the soft near-end of distal end is hard, make the sheath core main part 3 more easily through tortuous blood vessel, reach farther position, compare in offering the trompil 4 that the aperture is the same simultaneously, also can not make the undersize of the inside negative pressure of sheath core main part 3, lead to when suction thrombus, the condition that the thrombus drops easily takes place, the inside metal reinforcement layer 31 that is provided with of the near-end of sheath core main part 3, make the hardness of the near-end of sheath core main part 3 higher, simultaneously with push wire 2 be connected also can be more firm.

Further, the proximal end of the sheath-core main body 3 further includes an inner layer 32 and an outer layer 33 disposed outside the metal reinforcing layer 31, the distal end of the sheath-core main body 3 is disposed with the inner layer 32 and the outer layer 33, wherein the inner layer 32 is made of PTFE material, and the outer layer 33 is made of polymer material.

According to the technical scheme, stretch into the inside of suction catheter with porous sheath core, then drive the position that is close to thrombus 5 through suction catheter, then through adjustment handle 1, the sheath core main part 3 that promotes and send silk 2 and distal end enters into the thrombus, when suction catheter aspirates, because this sheath core main part 3 is the formula sheath core of handing over soon, inside has great cavity, utilize simultaneously to promote to send silk 2 and be connected with the side of sheath core main part 3, can not occupy the inner chamber of suction catheter, can make when suction catheter inner chamber is negative pressure, the inner chamber of sheath core main part 3 also can have the negative pressure state, simultaneously because the distal end of sheath core main part 3 is provided with multiunit trompil 4, can adsorb the garrulous bolt in trompil 4, simultaneously because the inside of sheath core main part 3 also is negative pressure, can make the thrombus combine together with sheath core main part 3 more easily, thereby supplementary pull thrombus.

Further, as shown in fig. 2, the opening 4 is a tapered opening, which means that the opening 4 has a larger diameter on the outer surface of the sheath-core main body 3 than on the inner surface thereof, and the opening 4 is circular or elliptical, which may be according to actual requirements.

Further, the junction of propelling movement silk 2 and sheath core main part 3 is the scarf for it is bigger to push away the area of linking of sending silk 2 and sheath core main part 3 junction, makes both connections more stable, makes the transmission that the thrust or the pulling force that propelling movement silk 2 received can be better to sheath core main part 3 simultaneously.

Further, the push wires 2 are welded with the metal reinforcing layer 31, so that the connection between the push wires and the metal reinforcing layer is more stable.

The embodiment provided by the invention comprises the following steps: the proximal end of the sheath-core body 3 comprises the metal reinforcing layer 31 and the outer layer 33, the distal end of the sheath-core body 3 comprises the outer layer 33, and the sheath-core body 3 has fewer layers, but still has stronger rigidity and the ability to pass through tortuous blood vessels.

Furthermore, the inner layer 32 is made of PTFE material, the outer layer 33 is made of polymer material, pebax, TPU or nylon and the like, and the friction force of the outer layer 33 is small, so that the damage to the inner wall of the blood vessel can be reduced.

Further, the distal end of the sheath-core main body 3 is of a conical structure, the length of the cone is 0.5-5cm, the distal end of the conical structure is also provided with an opening 4, and the conical structure can be better inserted into the thrombus.

Furthermore, the push wires 2 and the metal reinforcing layer 31 are made of nickel titanium, so that the push wires have good hardness and good over-bending capability.

Further, the outer layer 33 is mixed with a developing material or is provided with a developing ring outside, so that the position of the sheath core main body 3 can be clearly observed in the process of sucking thrombus, and the operation and the control are more convenient.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.

Claims

1. A porous sheath-core for assisting aspiration of intracranial thrombi, comprising a handle (1), characterized in that: one end of the handle (1) is connected with a push wire (2), and the outside of the push wire (2) is fixedly connected with a fast-crossing sheath core main body (3);

the sheath core main body (3) is provided with a plurality of groups of holes (4) with gradually reduced and sparse apertures from the far end to the near end, and a metal reinforcing layer (31) is arranged inside the near end of the sheath core main body (3).

2. A porous sheath core for assisting aspiration of intracranial thrombi according to claim 1, wherein: the opening (4) is a conical opening, and the opening (4) is circular or elliptical.

3. A porous sheath core for assisting aspiration of intracranial thrombi according to claim 1, wherein: the connection part of the push wire (2) and the sheath core main body (3) is an oblique notch.

4. A porous sheath core for assisting aspiration of intracranial thrombi according to claim 1, wherein: the push wire (2) is welded with the metal reinforcing layer (31).

5. A porous sheath core for assisting aspiration of intracranial thrombi according to claim 1, wherein: the proximal end of the sheath-core main body (3) further comprises an inner layer (32) and an outer layer (33) arranged outside the metal reinforcing layer (31), and the distal end of the sheath-core main body (3) is provided with the inner layer (32) and the outer layer (33).

6. A porous sheath core for assisting aspiration of intracranial thrombi according to claim 5, wherein: the proximal end of the sheath-core body (3) comprises the metal reinforcement layer (31) and the outer layer (33), and the distal end of the sheath-core body (3) comprises the outer layer (33).

7. A porous sheath core for assisting aspiration of intracranial thrombi according to claim 5, wherein: the inner layer (32) is made of PTFE material, and the outer layer (33) is made of polymer material.

8. A porous sheath core for assisting aspiration of intracranial thrombi according to claim 1, wherein: the far end of the sheath-core main body (3) is of a conical structure, and the length of the cone is 0.5-5cm.

9. A porous sheath core for assisting aspiration of intracranial thrombi according to claim 5, wherein: the push wire (2) and the metal reinforcing layer (31) are both made of nickel titanium.

10. A porous sheath core for assisting aspiration of intracranial thrombi according to claim 5, wherein: the outer layer (33) is mixed with a developing material or provided with a developing ring outside.