CN216823579U - Rail type mechanical thrombus aspiration catheter - Google Patents

Abstract

The utility model discloses a rail mounted machinery thrombus suction catheter belongs to the blood vessel and intervenes medical instrument technical field. The suction catheter comprises a suction catheter, wherein a transmission shaft and an eccentric metal head are arranged in the suction catheter; the far end of the suction catheter is provided with a metal connecting pipe; the far end of the transmission shaft is connected with an eccentric metal head, the mass center of the eccentric metal head deviates from the rotation axis of the transmission shaft, and the eccentric metal head is positioned in the metal connecting pipe. This suction catheter adopts eccentric metal head structure, and eccentric circular cone swing is made at the suction catheter distal end to eccentric metal head, can increase suction opening suction area through eccentric settings, improves suction opening suction effort, and the broken big piece thrombus near suction opening of eccentric circular cone swing fragmentation structure reduces near suction opening's thrombus and blocks, improves thrombus suction efficiency, reduces blood loss, reduces the operation time.

Description

Rail type mechanical thrombus aspiration catheter

Technical Field

The utility model relates to a rail mounted machinery thrombus suction catheter belongs to the blood vessel and intervenes medical instrument technical field.

Background

Abnormal blood flow within a vessel, such as turbulent blood flow, slow flow rates, etc., can lead to the formation of thrombus, resulting in vessel blockage or stenosis, resulting in restricted blood supply to the downstream region of the vascular system. Such hemodynamic abnormalities can lead to a range of adverse consequences such as hypoxia, abnormal intravascular pressure, heart failure with increased heart load, and the like. When a thrombus is located in the neurovascular system, a stroke may be initiated; when thrombi are in the deep venous vasculature of the lower extremities, swelling or paralysis of the lower extremities may result; when a thrombus is located in the pulmonary vasculature, it can cause pulmonary embolism, leading to death of the patient. Vascular abnormalities typically require restoration or reconstruction of intravascular blood flow through catheter intervention techniques.

With the development of technology, in recent years, a mechanical thrombus removal (PMT) device has appeared, which is a group of devices for removing blockages in blood vessels, and removes blockages such as thrombus and plaque in blood vessels by dissolving, crushing, aspiration, stent or basket thrombolysis, so as to restore blood circulation function.

The existing thrombus removing device is mainly characterized in that the near end of a suction catheter is connected with a negative pressure device, the far end of a suction blood vessel is guided into the blood vessel through a guide wire, the part close to thrombus is sucked, the thrombus is sucked away from the blood vessel, and the thrombus removing work is completed. However, the traditional thrombus aspiration catheter easily causes the blockage of the aspiration catheter aspiration opening by a large thrombus, and once the distal end of the aspiration catheter of the existing thrombus removing device is blocked, the aspiration needs to be stopped, and the device can continue after the blockage is removed, so that the operation time is greatly prolonged, and the operation risk is increased. At present, some suction devices are provided with mechanical rotary cutting thrombus devices near the suction port of a suction catheter, but the rotary cutting devices easily cause the suction port to be narrow, namely, the effective suction area of the suction port is reduced, so that thrombus is not easily sucked into the suction catheter, and the suction force and the suction flow are reduced due to the narrow suction port, so that the thrombus suction efficiency is reduced.

Therefore, the track type mechanical thrombus suction catheter is designed, and the eccentric rotary grinding head performs conical track type circular swing and self circular high-speed rotary motion in the proximal end of the suction catheter to break and crack large thrombus and prevent the proximal end of the suction catheter from being blocked.

Disclosure of Invention

The utility model discloses the technical problem that will solve lies in: provides a track type mechanical thrombus aspiration catheter, which solves the problem that the distal end of the aspiration catheter of the current thrombus aspiration device is blocked.

The utility model discloses the technical problem that will solve takes following technical scheme to realize:

a rail type mechanical thrombus suction catheter comprises a suction catheter, wherein the near end of the suction catheter is connected with a driving handle through a three-way hemostatic valve, a rotating mechanism is arranged inside the driving handle, and a transmission shaft and an eccentric metal head are arranged in the suction catheter;

the far end of the suction catheter is provided with a metal connecting pipe;

the near end of the transmission shaft penetrates through the three-way hemostatic valve to be connected with a rotating mechanism in the driving handle, the far end of the transmission shaft is connected with an eccentric metal head, the mass center of the eccentric metal head deviates from the rotating axis of the transmission shaft, and the eccentric metal head is positioned in the metal connecting pipe.

As a preferred example, the distal end face of the suction catheter is flat or beveled.

As a preferred example, the transmission shaft is externally provided with a layer of wear-resistant lubricating pipe.

As a preferred example, the circumferential surface of the eccentric metal head is provided with any one of convex teeth, corrugated teeth or an eccentric cylinder.

As a preferred example, the surface of the eccentric metal head is provided with a coating of silicon carbide.

As a preferred example, the transmission shaft adopts a hollow or solid transmission shaft structure formed by weaving a single or a plurality of steel wires.

As a preferred example, the diameter of the transmission shaft is constant from the proximal end to the distal end, or the diameter of the transmission shaft is gradually reduced from the proximal end to the distal end, or the transmission shaft adopts two sections of different diameters, the proximal end is larger than the distal end, and the transmission shaft with the two sections of different diameters is smoothly transited.

The beneficial effects of the utility model are that:

(1) compared with the existing crushing structure which rotates circumferentially, the eccentric metal head swings eccentrically at the far end of the suction catheter, the suction area of a suction opening can be increased through eccentric arrangement, the suction acting force of the suction opening is improved, and meanwhile, the eccentric cone swinging crushing structure crushes large thrombi near the suction opening, so that the thrombus blockage near the suction opening is reduced, the thrombus suction efficiency is improved, the blood loss is reduced, and the operation time is reduced;

(2) through the rotation and around the swing of pipe axis revolution in the metal connecting pipe circumference lumen of drive handle driven transmission shaft and eccentric metal head along the suction catheter distal end, can improve the effective suction area of suction mouth, toper rail mounted circumference swing can stir and broken suction mouth thrombus simultaneously, cut broken thrombus when guaranteeing enough effective suction area, improve the efficiency and the validity of suction thrombus, in addition, high-speed rotatory transmission shaft also can be at blood vessel transfer in-process broken thrombus once more, prevent that the thrombus from blockking up suction catheter middle part.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the configuration of the distal end of the aspiration catheter with a flat mouth;

FIG. 3 is a schematic view of the configuration of the distal end of the aspiration catheter with a beveled tip;

FIG. 4 is a schematic view of the internal structure of the distal end of the aspiration catheter;

FIG. 5 is a schematic view of the configuration of the distal end of the aspiration catheter;

FIG. 6 is a schematic view of a structure of a wear-resistant lubrication tube provided on a transmission shaft in a suction duct;

FIG. 7 is a schematic view of a structure of an eccentric metal head with convex teeth;

FIG. 8 is a schematic view of an end structure of an eccentric metal head with teeth;

FIG. 9 is a schematic view of the structure of an eccentric metal head with an eccentric cylinder;

FIG. 10 is a schematic view of an end structure of an eccentric metal head with an eccentric cylinder;

FIG. 11 is a schematic view of a drive shaft configuration having the same diameter from proximal to distal end;

FIG. 12 is a schematic view of a drive shaft configuration having a decreasing diameter from the proximal end to the distal end;

FIG. 13 is a schematic view of a proximal to distal configuration of a drive shaft having a large diameter and a smooth transition to a small diameter;

FIG. 14 is a schematic view of the eccentric metal head performing a conical track type circular oscillation;

FIG. 15 is a schematic view of the end structure of the eccentric metal head performing a conical orbital circular oscillation;

FIG. 16 is a perspective view of the interior of the drive handle;

FIG. 17 is a schematic view showing the inner side structure of the driving handle

FIG. 18 is a schematic view of the structure of a guidewire entering a vascular thrombus;

FIG. 19 is a schematic view of the structure of a vascular sheath along a guidewire into a vascular thrombus;

FIG. 20 is a schematic view of the configuration of the aspiration catheter along the guidewire into the thrombus;

FIG. 21 is a schematic view of an eccentric metal head at the distal end of an aspiration catheter breaking thrombus;

fig. 22 is a schematic structural view of the device for removing blood vessels from a human body after the operation is finished.

In the figure: the hemostatic pump comprises a suction catheter 1, a three-way hemostatic valve 2, a driving handle 3, a motor 301, a driving gear 302, a driven gear 303, a hollow shaft 304, a coupler 305, a transmission shaft 4, an eccentric metal head 5, a convex tooth 501, an eccentric cylinder 502, a metal connecting pipe 6, a wear-resistant lubricating pipe 7, thrombus 8, a vascular sheath 9, a guide wire 10 and a blood vessel 11.

Detailed Description

In order to make the technical means, the creation features, the achievement purposes and the functions of the present invention easy to understand and understand, the present invention will be further described with reference to the following embodiments.

For the purposes of the following terms, the terms clot, thrombus 8, embolus and obstruction may be used synonymously. Although the present invention has been described with respect to an obstruction removal device, the device may also be used to capture blood clots, thrombus 8, emboli, foreign matter and other matter.

For ease of description, the following description uses the terms "proximal" and "distal", where "proximal" refers to the end proximal to the operative end and "distal" refers to the end distal to the operative end.

Example 1

As shown in fig. 1-22, a rail-mounted mechanical thrombus aspiration catheter comprises an aspiration catheter 1, wherein the proximal end of the aspiration catheter 1 is connected with a driving handle 3 through a three-way hemostatic valve 2, a rotating mechanism is arranged inside the driving handle 3, and a transmission shaft 4 and an eccentric metal head 5 are arranged in the aspiration catheter 1;

as shown in fig. 4, the distal end of the suction catheter 1 is provided with a metal connecting tube 6;

as shown in fig. 1-5, the proximal end of the transmission shaft 4 passes through the three-way hemostatic valve 2 and is connected with the rotating mechanism in the driving handle 3, the distal end of the transmission shaft 4 is connected with the eccentric metal head 5, the mass center of the eccentric metal head 5 deviates from the rotation axis of the transmission shaft 4, and the eccentric metal head 5 is positioned in the metal connecting pipe 6. The metal connecting pipe 6 can limit the swing of the eccentric metal head 5 and is wear-resistant.

As shown in fig. 3 and 4, the distal end surface of the aspiration catheter 1 is flat or beveled.

As shown in fig. 6, a layer of wear-resistant lubricating pipe 7 is arranged outside the transmission shaft 4. The wear-resistant lubricating tube 7 is a wear-resistant polymer tube (for example, polyetheretherketone peek, polyethylene PE, polyoxymethylene POM, etc., which have wear-resistant and lubricating properties) for protecting and lubricating the transmission shaft 4, and physiological saline can be injected into the wear-resistant lubricating sleeve 7 for liquid lubrication.

As shown in fig. 7 to 10, the circumferential surface of the eccentric metal head 5 is provided with any one of convex teeth 501, corrugated teeth (smooth teeth are connected in a corrugated shape), or an eccentric cylinder 502. The eccentric convex teeth 501 cut the thrombus 8 by sharp tooth edges, and the eccentric corrugated teeth, the eccentric cylinder 502 crush the thrombus 8 by cutting and extruding.

The surface of the eccentric metal head 5 is provided with a carborundum coating (not shown in the figure). After the surface of the diamond is sprayed with the diamond grains, the cutting and grinding capabilities of the diamond grains can be obviously enhanced. The eccentric metal head 5 can adopt a hollow or solid structure.

As shown in fig. 11 to 14, the transmission shaft 4 is a hollow or solid transmission shaft 4 structure formed by weaving a single or a plurality of steel wires. Has stronger high-speed transmission kink resistance. And has good eccentric orbit type circular oscillation effect.

The hollow transmission shaft 4 is matched with the hollow eccentric metal head 5 and is used for a guide wire 10 to penetrate; when a solid drive shaft 4 is used, the guide wire 10 is threaded directly from the aspiration catheter 1.

The diameter of the drive shaft 4 is constant from the proximal end to the distal end. The kink resistance is slightly weaker.

Or the diameter of the transmission shaft 4 is gradually reduced from the near end to the far end, or the transmission shaft 4 adopts two sections of different diameters, the near end is larger than the far end, and the two sections of transmission shafts 4 with different diameters are in smooth transition, and under the two conditions, the small end of the transmission shaft 4 is connected with the eccentric metal head 5. The thicker the diameter, the stronger the high speed drive kink resistance. The proximal end of the transmission shaft 4 is connected with a driving structure, so that the requirement on kink resistance at the proximal end is higher, the proximal end needs to be thicker, and the distal end is gradually narrowed.

The ratio of the radially widest point of the eccentric metal head 5 to the inner diameter of the suction catheter 1 is 0.3. More space is available for suction.

As shown in fig. 15, the suction catheter 1 adopts the eccentric metal head 5 structure, and compared with the existing crushing structure with circumferential rotation, the eccentric metal head 5 can make up the suction space through eccentric arrangement, which does not cause the problem of narrowing of the suction port of the suction catheter 1, and more effective suction area of the suction port is reserved, so that the thrombus 8 is more easily sucked into the suction catheter 1, and the residual space of the suction port is more, and the suction force is also improved;

through drive handle 3 driven transmission shaft 4 and eccentric metal head 5 along the swing of carrying out the rotation and revolving around the pipe axis in the 6 circumference lumen of metal connecting pipe of suction catheter 1 distal end, can improve the effective suction area of suction mouth, toper rail mounted circumference swing can stir and broken suction mouth thrombus 8 simultaneously, cut broken thrombus 8 when guaranteeing enough effective suction area, improve the efficiency and the validity of suction thrombus 8, furthermore, high-speed rotatory transmission shaft 4 also can be at suction catheter 1 transfer process broken thrombus 8 once more, prevent that thrombus 8 from blockking up suction catheter 1 middle part.

Example 2

As shown in fig. 16 and 17, the hollow drive shaft 4 and the hollow eccentric metal head 5 are designed into a drive handle 3, a rotating mechanism in the drive handle 3 is composed of a motor 301, a drive gear 302, a driven gear 303 and a hollow shaft 304 which are arranged in the drive handle 3, the motor 301 is connected with the drive gear 302 through a coupling 305, the drive gear 302 is movably arranged in the drive handle 3 through a bearing, the driven gear 303 is fixed on the hollow shaft 304, the hollow shaft 304 is movably arranged in the drive handle 3 through a bearing, the drive gear 302 is meshed with the driven gear 303, and the drive shaft 4 is fixed at the far end of the hollow shaft 304. The drive shaft 4 is installed in the distal tube of the hollow shaft 304 in an interference fit manner and is fixed by welding or glue. The other structure is the same as embodiment 1.

The motor 301 in the driving handle 3 drives the driving gear 302 and the driven gear 303 to rotate, so that the transmission shaft 4 and the eccentric metal head 5 are driven to rotate, and the eccentric metal head 5 swings in a conical track type circumference.

As shown in fig. 18 to 22, according to the structure scheme of the embodiment 2, the operation steps are as follows:

(1) during operation, a blood vessel sheath 9 is arranged outside the suction catheter 1, a guide wire 10 is penetrated through the hollow shaft 304 of the driving handle 3, the transmission shaft 4, the suction catheter 1 and the blood vessel sheath 9, and the guide wire 10 enters the blood vessel 11 and penetrates through obstructions such as thrombus 8 and the like;

(2) the vascular sheath 9 reaches the position near the far end of the thrombus 8 along the guide wire 10 to establish an inner channel of the blood vessel 11;

(3) the suction catheter 1 is guided to the position near the far end of the thrombus 8 along the vascular sheath 9 and the guide wire 10, a motor 301 switch of the driving handle 3 is turned on, a transmission shaft 4 in the suction catheter 1 rotates at a high speed (1 thousand-8 ten thousand revolutions per minute), so that the eccentric metal head 5 generates conical track type circular oscillation and self high-speed rotary grinding motion near a suction port, a negative pressure port on the side surface of the three-way hemostatic valve 2 of the driving handle 3 is communicated with a negative pressure suction source, a silica gel hemostatic valve plate is arranged at the near end of the three-way hemostatic valve 2 and sleeved outside the wear-resistant lubricating tube 7 to form a dynamic sealing structure, blood outflow can be prevented, negative pressure suction is generated at the suction port of the suction catheter 1, and the thrombus 8 is sucked into a tube port;

(4) the suction catheter 1 sucks thrombus 8 near a suction opening into a lumen under negative pressure, the transmission shaft 4 rotates to drive the eccentric metal head 5 positioned at the head end to rotate at a high speed, the guide wire 10 withdraws from the suction catheter 1 when the eccentric metal head 5 rotates, and meanwhile, the eccentric metal head 5 swings in a conical track type circumference, the convex teeth 501 of the eccentric metal head 5 and carborundum on the surface can cut and stir the thrombus 8 positioned at the tube opening of the suction catheter 1 at a high speed, and large thrombus 8 is cut and crushed into small thrombus 8, so that the small thrombus 8 is discharged out of the body under the action of negative pressure suction;

(5) after the thrombus 8 is sucked, the vascular sheath 9, the suction catheter 1 and the guide wire 10 are all withdrawn from the human body.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the above-described embodiments, and that various changes and modifications may be made without departing from the spirit and scope of the invention, and such changes and modifications are intended to be included within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (7)

1. A track type mechanical thrombus aspiration catheter comprises an aspiration catheter and is characterized in that a transmission shaft and an eccentric metal head are arranged in the aspiration catheter;

the far end of the suction catheter is provided with a metal connecting pipe;

the far end of the transmission shaft is connected with an eccentric metal head, the mass center of the eccentric metal head deviates from the rotation axis of the transmission shaft, and the eccentric metal head is positioned in the metal connecting pipe.

2. The orbital mechanical thrombus aspiration catheter according to claim 1, wherein the distal end face of the aspiration catheter is flat or beveled.

3. The mechanical orbital thrombus aspiration catheter of claim 1, wherein a layer of wear-resistant lubricating tube is disposed outside the drive shaft.

4. The orbital mechanical thrombus aspiration catheter according to claim 1, wherein the circumferential surface of the eccentric metal head is provided with any one of convex teeth, corrugated teeth or eccentric cylinders.

5. The orbital mechanical thrombus aspiration catheter according to claim 1 or 4, wherein the eccentric metal head surface is provided with a silicon carbide coating.

6. The mechanical orbital thrombus aspiration catheter according to claim 1, wherein the drive shaft is a hollow or solid drive shaft structure formed by braiding one or more steel wires.

7. The orbital mechanical thrombus aspiration catheter according to claim 1 or 6, wherein the diameter of the drive shaft is constant from the proximal end to the distal end, or the diameter of the drive shaft is gradually reduced from the proximal end to the distal end, or the drive shaft has two sections of different diameters, the proximal end is larger than the distal end, and the two sections of drive shafts with different diameters are smoothly transited.

Images