CN211934425U - Capturing device and filter system - Google Patents

Abstract

The utility model relates to a capture device and filter system, the capture device is including the ware of catching and the control rod that link to each other, the ware of catching is including catching the piece, be provided with the inner chamber that runs through along the axial in the control rod, it is mobilizable to be located to catch in the inner chamber, the one end of catching the piece is followed wear out in the inner chamber, fix the distal end of control rod, the other end of catching the piece passes through the inner chamber is followed the proximal end of control rod is worn out, makes it is in the distal end side of control rod is formed with the adjustable ring of catching of internal diameter size. The utility model discloses capture device and filter system's beneficial effect: by arranging the catching ring with the adjustable inner diameter, after the catching ring is sleeved on the recovering piece of the filter, the catching ring can be integrally contracted, the catching ring is tightly connected with the recovering piece, so that the catching ring and the recovering piece are prevented from being separated in the recovering process, and the success rate of recovering the filter is improved.

Description

Capturing device and filter system

Technical Field

The utility model relates to an implant medical instrument technical field, especially relate to a capture device and filter system.

Background

Pulmonary embolism is a clinical and pathophysiological syndrome of pulmonary circulatory disturbance caused by the blockage of the main trunk or branch of pulmonary artery by endogenous or exogenous emboli, and the disease can involve important organs such as brain, heart, kidney and the like, and even involve the whole circulation and respiratory system to cause life risks. In the existing treatment methods, a temporary vena cava filter (hereinafter referred to as a filter) is implanted into a blood vessel, and the filter is used for intercepting large thrombus to prevent the large thrombus from blocking the blood vessel at important visceral organs and other positions, so that the visceral organs of a patient are prevented from being damaged by oxygen deficiency. The filter is simple in structure, is fixed on the blood vessel wall by self-expansion, and is removed after the lesion is relieved or relieved.

At present, a capture device is adopted clinically to recover a filter, the capture device comprises a capture ring sleeve and a control lever connected with the capture ring sleeve, when in recovery, the capture ring sleeve is connected with a recovery hook of the filter, and then the filter is recovered. However, in clinical use of the trap, the trap ring and the recovery hook of the filter are easily released, resulting in failure of recovery of the filter.

SUMMERY OF THE UTILITY MODEL

Therefore, a catching device and a filter system are needed to solve the problem that the catching device and the filter are easy to loosen in the recovery process.

The utility model provides a capture device, including the ware of catching and the control rod that link to each other, the ware of catching is including catching the piece, be provided with the inner chamber that runs through along the axial in the control rod, it is mobilizable to catch to be located in the inner chamber, the one end of catching the piece is followed wear out in the inner chamber, fix the distal end of control rod, the other end of catching the piece passes through the inner chamber is followed the proximal end of control rod is worn out, makes it is in the distal end side of control rod is formed with the adjustable ring of catching of internal diameter size.

In the catching device of the present invention, the catching device further comprises a spring tube, and the spring tube is disposed outside the catching ring.

In the catching device of the present invention, at least one end of the spring tube is fixed on the catching ring.

In the capturing device of the present invention, the operating lever is provided with at least two cutting grooves penetrating through the inner cavity in the radial direction, and the cutting grooves divide the operating lever into at least two petals arranged at intervals in the circumferential direction; the catching device further comprises a locking piece, the locking piece is sleeved outside the petal and can radially press the petal, and the catching piece is fixedly connected with the inner cavity.

Arresting device in, the retaining member is hollow structure, be equipped with the inclined plane internal thread in the retaining member, the surface of lamella be equipped with inclined plane internal thread complex inclined plane screw thread.

In the capture device of the present invention, the petal is located at a proximal end of the control lever.

In the catching device of the present invention, the petals are evenly arranged along the circumferential direction.

In the catching device of the present invention, the catching ring is a split ring.

The utility model also provides a filter system, include as above-mentioned arrest device.

The utility model provides a capture device and filter system, through setting up the ring of arresting with adjustable internal diameter size, after arresting the ring cover on the recovery piece of filter, can make and arrest the whole shrink of ring, will arrest the ring and retrieve the piece and tightly link together to avoid arresting the ring and retrieving the piece and break away from at the recovery in-process, improve the success rate that the filter was retrieved.

Drawings

FIG. 1 is a schematic diagram of a filter system according to one embodiment;

FIG. 2 is a schematic diagram of a strainer system according to an embodiment;

FIG. 3 is a schematic diagram of the main structure of the strainer shown in FIG. 2;

FIG. 4(a) is a schematic view of a configuration of a catcher of a catching device in the filter system of the embodiment;

figure 4(b) is a schematic view of the construction of the spring tube in the trap shown in figure 4 (a);

FIG. 4(c) is a schematic cross-sectional view of the spring tube shown in FIG. 4 (b);

figure 4(d) is a schematic view of the structure of the catch in the catch shown in figure 4 (a);

FIG. 5 is a schematic view of a joystick of the strainer system in an embodiment, showing a schematic view of a cross-section of the joystick at A-A and B-B;

FIG. 6 is a schematic cross-sectional view of a retaining member of the catching device in the strainer system according to an embodiment;

fig. 7 is a schematic view showing an assembled structure of the catching device in the filter system in one embodiment.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

In the field of interventional medical devices, the end of a medical device implanted in a human or animal body closer to an operator is generally referred to as the "proximal end", the end farther from the operator is referred to as the "distal end", and the "proximal end" and the "distal end" of any component of the medical device are defined according to this principle. "axial" generally refers to the length of the medical device as it is being delivered, and "radial" generally refers to the direction of the medical device perpendicular to its "axial" direction, and defines both "axial" and "radial" directions for any component of the medical device in accordance with this principle.

Referring to fig. 1, a filter system 100 in one embodiment includes a filter 10 and a capture device 20.

The filter 10 is used for being implanted into a blood vessel, and has the effect of filtering blood by intercepting large thrombus, so as to prevent the thrombus from blocking the blood vessel at the position of important visceral organs and the like to cause the hypoxia damage of the visceral organs.

Referring to fig. 2, the strainer 10 includes a main body structure 12 and a recovery member 11 attached to an end of the main body structure 12.

In some embodiments, the main body structure 12 is formed by cutting and shaping a tube material with superior self-expansion performance, such as a nitinol tube, for example, as shown in fig. 3, the main body structure 12 is formed by cutting and shaping a nitinol tube, and includes a first connecting member 121, a second connecting member 123, and a plurality of supporting rods 122 connected between the first connecting member 121 and the second connecting member 123. The number of the supporting rods 122 may be 3 or more than 3, and is not limited herein. The support rod 122 includes a first filter screen, a second filter screen and a support portion connected between the first filter screen and the second filter screen, the first filter screen is fixedly connected to the first connector 121, the second filter screen is fixedly connected to the second connector, and after the filter 10 is released, the support portion abuts against the inner wall of the blood vessel to fix the filter 10 in the blood vessel.

The outer diameter of the tubing used to form the body structure 12 may be from 0.2mm to 4mm, and the dimensions of the tubing used to form the body structure 12 are not limited thereto.

The retriever 11 may be connected to the first connector 121 or the second connector 123 of the body structure 12 by welding, screwing, etc., and is used for catching the catching means 20 so that the catching means 20 can pull the filter 10 to move.

In this embodiment, the filter 10 is a frame filter with two closed ends, and those skilled in the art will appreciate that the closed frame filter of this embodiment is merely used as an example, and in other embodiments, the filter 10 may be a single umbrella open filter. Wherein, single umbrella open filter includes many spinal branchs vaulting pole, and the one end of many spinal branchs vaulting pole is the open end, and the other end gathers together and retrieves the piece and be connected.

Referring again to fig. 1, the catch device 20 includes a catch 21, a lever 22 and a lock 23.

As shown in fig. 4(a) and 4(d), the catcher 21 is used for catching the recovery member 11 of the filter 10, the catcher 21 includes a spring tube 211 and a catcher 212, a distal end of the catcher 212 is provided with a catching ring 2123 with an adjustable inner diameter, the catching ring 2123 is a split ring, and the spring tube 211 is sleeved outside the catching ring 2123. The capture 212 may be formed from a single filament of nickel titanium or stainless steel, a plurality of strands of nickel titanium or stainless steel, or a flat ribbon of nickel titanium or stainless steel.

In some embodiments, the capture ring 2123 is pre-shaped into a quasi-circular ring, and the capture ring 2123 automatically returns to the quasi-circular ring when the capture 21 is released from the sheath. The spring tube 211 is fitted over the catch ring 2123 of the catch 212, and due to the elastic deformability of the spring tube 211, the spring tube 211 can deform along with the catch ring 2123 when the inner diameter surrounded by the catch ring 2123 is reduced.

In some embodiments, as shown in connection with fig. 2, the retriever 11 is hook-shaped, having a distally directed opening, so that it is caught by the catching means 20. After the catching ring 2123 is fitted around the recovering member 11, the catching ring 2123 is integrally contracted, that is, the inner diameter of the ring surrounded by the catching ring 2123 is reduced, and the catching ring 2123 and the recovering member 11 are tightly connected together, so that the catching ring 2123 is prevented from being separated from the recovering member 11, and the recovery success rate of the filter 10 is improved.

As shown in connection with fig. 4(b), the spring tube 211 has opposite first and second ends 2111, 2112, with at least one of the first and second ends 2111, 2112 being secured to the catch ring 2123 so that the spring tube 211 better contracts with the catch ring 2123 during contraction of the inner diameter encompassed by the catch ring 2123 as the catch 212 is drawn.

Fig. 4(c) is a schematic cross-sectional view of the spring tube 211, wherein the spring tube 211 is made of a material with good shape memory, such as nitinol. In some embodiments, the spring tube 211 is pre-shaped like a circular ring, and because the spring tube 211 has a good shape memory, when the capture device 21 is released from the sheath, the spring tube 211 automatically returns to like a circular ring and makes the capture ring 2123 enclosed therein to be like a circular ring, the spring tube 211 can prevent the capture ring 2123 from deforming under the impact of blood flow, so that the capture ring 2123 maintains a larger inner diameter for being sleeved on the filter 10 for capture.

It should be noted that the spring tubes 211, when fitted over the capture ring 2123 of the capture 212, increase the overall size of the capture ring 2123, thereby increasing the detectability of the capture ring 2123 under x-rays and allowing accurate fitting of the capture ring 2123 over the retriever 11 during retrieval.

As shown in connection with FIG. 5, the joystick 22 has opposite distal 221 and proximal 222 ends and has first 223 and second 224 lumens formed therein. A first lumen 223 extends through the distal end 221 and proximal end 222 of the shaft 22, and a second lumen 224 extends through at least the distal end 221 of the shaft 22. Referring to fig. 4(d), 5 and 7, the catch 212 has opposite distal and proximal ports 2121 and 2122, and when the lever 22 and the catch 21 are engaged, the second lumen 224 secures the distal port 2121 of the catch 212, the catch 212 is axially movably disposed through the first lumen 223, and the proximal port 2122 of the catch 212 exits the proximal end 222 of the lever 22, such that the catch 212 forms the catch loop 2123 on the distal side of the lever 22.

With continued reference to fig. 5, the proximal end 222 of the lever 22 is provided with beveled threads 225, while the proximal end 222 of the lever 22 is provided with a plurality of slots 226 extending radially through the first lumen 223, the plurality of slots 226 separating a plurality of circumferentially spaced lobes 227 at the proximal end of the lever 22. Because the catching piece 212 penetrates through the first inner cavity 223, after the catching piece 212 penetrates through the first inner cavity 223, the petals 227 surround the periphery of the catching piece 212, so that the petals 227 can clamp and fix the catching piece 212 when being radially extruded, and the catching piece 212 is axially limited on the operating rod 22.

The number of the slits 226 may be 2 or more.

As shown in fig. 5, the 4 slots 226 separate 4 petals 227 at the proximal end 222 of the lever 22. In other embodiments, the proximal end 222 of the joystick 22 is separated by at least 2 petals 227.

As shown in fig. 6, the locker 23 is provided with a slanted female thread 23a and a through hole 23b, and the slanted female thread 23a can be engaged with a slanted thread 225 on the manipulation lever 22. After the locking member 23 is threadedly engaged with the proximal end 222 of the lever 22, the catch 212, which is inserted through the lever 22, can be passed out of the through hole 23 b.

When the locking member 23 is engaged with the inclined threads 225 of the operating lever 22 by the inclined internal threads 23a, as the locking member 23 is screwed, the locking member 23 radially presses the petals 227 at the inclined threads 225, and since the petals 227 are spaced apart by the cutting slots 226, the petals 227 can radially tighten when radially pressed by the locking member 23, thereby clamping the catch 212 in the first cavity 223, maintaining the catch ring 2123 of the catch 212 at a fixed inner diameter, thereby maintaining the catch of the filter 10 and preventing the filter 10 from loosening from the catch ring 2123. Accordingly, to release the catch of the filter 10, radial compression of the petals 227 by the lock 23 is released to accommodate axial movement of the catch 212 within the handle 22 to increase or decrease the inner diameter encompassed by the catch ring 2123.

As shown in fig. 7, the catching ring 2123 of the catcher 21 of the catching device 20 is normally in a larger-sized loop line. When the catch ring 2123 is hooked to the retriever 11, the locking element 23 is loosened, the fastening connection between the catch 212 and the actuating lever 22 is released, the catch 212 is then pulled back proximally, the inner diameter enclosed by the catch ring 2123 is reduced, and when the inner diameter of the catch ring 2123 cannot be further reduced, the catch ring 2123 is firmly held against the retriever 11, whereupon the locking element 23 is tightened, clamping the catch 212 in the first cavity 223 by the engagement of the locking element 23 with the actuating lever 22 prevents the filter 10 from being detached from the catch ring 2123 during the catching process, and thus a better retrieval is achieved.

It will be appreciated by those skilled in the art that the capture device 20 of the present embodiment is provided by way of example only, and not by way of limitation, and that the capture device 20 of the present application may have other configurations, as long as the inner diameter of the capture ring 2123 of the capture device 20 is adjustable. For example, in other embodiments, the capture device 20 includes a capture 21 and a shaft 22, wherein one end of the capture 21 is fixed to the distal end of the shaft 22 and the other end is movably disposed through the first lumen 223 of the shaft 22, such that the inner diameter of the capture ring 2123 is adjustable. In this embodiment, the capture device 20 does not include a locking member 23, and the proximal end of the lever 22 need not be provided with ramped threads 225 and slots 226 that mate with the locking member 23.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (9)

1. The catching device comprises a catching device and a control rod which are connected, and is characterized in that the catching device comprises a catching piece, an inner cavity which penetrates through the control rod along the axial direction is formed in the control rod, the catching piece is movably positioned in the inner cavity, one end of the catching piece penetrates out of the inner cavity and is fixed at the far end of the control rod, the other end of the catching piece penetrates out of the near end of the control rod through the inner cavity, and a catching ring with the adjustable inner diameter is formed on the far end side of the control rod by the catching piece.

2. The capture device of claim 1, wherein the capture further comprises a spring tube that is sleeved outside the capture ring.

3. The capture apparatus of claim 2, wherein at least one end of the spring tube is secured to the capture ring.

4. The capture device of claim 1, wherein the lever has at least two slots extending radially therethrough into the interior cavity, the slots separating the lever into at least two circumferentially spaced lobes; the catching device further comprises a locking piece, the locking piece is sleeved outside the petal and can radially press the petal, and the catching piece is fixedly connected with the inner cavity.

5. The catching device of claim 4 wherein the locking member is hollow and has internal inclined threads and the outer surface of the petal has internal inclined threads that mate with the internal inclined threads.

6. The capture device of claim 4, wherein the petals are located at a proximal end of the lever.

7. The capturing device according to claim 4, wherein a plurality of the petals are uniformly arranged in a circumferential direction.

8. The capture device of claim 1, wherein the capture ring is a split ring.

9. A filter system comprising a capture device according to any one of claims 1 to 8.

Images