JPH08257031A - Filter - Google Patents

Abstract

PURPOSE: To automatically restore wire rods to a former shape in a blood vessel, and capture a thrombus by opening a capturing part by arranging a reinforcing part in a contact part of the wire rods of an optional angle, the optional number and an optional shape, and arranging the capturing part having an optional shape inside the wire rods. CONSTITUTION: The tip of a sheath 7 is detained in an object part in an in vivo blood vessel from outside of the body, and a wire rod 1A is combined at an angle of 45 degrees with a wire rod 1B from a tail end opening part of its sheath 7, and a wire rod 1C is combined with the wire rod 1A and the wire rod 1B, and its contact part 2 is inserted into the sheath 7 by reducing a diameter of a filter 13 fixed by welding. Next, the filter 13 is pushed out by a pushing catheter, and a diameter of the filter 13 is expanded, and the filter 13 is detained in a blood vessel. The wire rods are formed in an optional shape, and a capturing part 14 is arranged, and the filter 13 is made detainable in a blood vessel. Therefore, the wire rods are automatically restored in a former shape in a blood vessel, and the capturing part 14 is opened, and a thrombus can be captured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a filter for preventing thrombus movement.

[0002]

2. Description of the Related Art As a conventional technique, a catheter for introducing a filter is placed at a target site, a main body of the filter is inserted into a lumen of the introducing catheter, and a guide wire for pushing out,
Alternatively, a push-out catheter is known to push out the main body from the tip of the catheter, and the main body has a badminton shuttle shape and a pawl for preventing movement is provided on the outside of the shuttle. (For example, Japanese Medical Journal 51st 7th
No. 72P to 74P) As another technique, as shown in FIG. 22, a net-shaped fiber (5) for catching a bird is fixed to one end of two V-shaped filter shafts (4) to form a V-shaped filter shaft (4). There is known a technique in which a pawl (6) for preventing movement is provided in the portion (4) and is placed in a blood vessel. (For example, JouNAL of
VAscuLAr surgery, 1 (1984)
498-501)

[0003]

The prior art has the following drawbacks. B) Due to its shuttle-like shape, it is difficult to fix it inside the blood vessel, and it is easy to tilt the blood clot depending on the patient's position. B) When inserted into the body, a large-diameter catheter is used to insert the filter, resulting in large blood vessel damage. C) Since the filter body is assembled by welding,
The body easily breaks during long-term insertion.

With regard to the latter technique, d) it is time-consuming and complicated because it is a method of pushing out a filter from the tip of a catheter to form a net shape in a blood vessel. E) Once inserted and placed in the blood vessel, the recovery position cannot be corrected because there is no recovery or correction ring and no metal thread. F) Since the net is created by operating the guide wire, the indwelling shape of the net can be uneven unless the user is skilled. The present invention has been invented to eliminate the above drawbacks.

[0005]

[Means for Solving the Problems] FIG. 1 shows a wire rod having an arbitrary shape.
Weld at the combined contact part as described above. Next, as shown in FIG. 3, the reinforcing portion is attached to the contact portion of the wire. Next to the filter
Attach the capture part as shown.

A ring and a wire are provided on the filter as shown in FIG.

A stopper is provided on the filter.

Further, the wire is bent into a corrugated shape as shown in FIG. 2, and one end and the other end of the wire are fixed. Next, as shown in FIG. 5, a capturing portion is provided inside the wire.

[0009]

[Operation] With the above-mentioned configuration, the sheath is inserted from the outside of the body into the body, and the sheath is stopped at the target site. Next, the filter 13 whose outer diameter is reduced as shown in FIG. 6 is inserted into the sheath inner cavity through the sheath insertion port. Next, a pushing catheter is inserted from the sheath insertion port, and the filter 13 is moved to push it out from the sheath tip as shown in FIG. Where the wire is
It returns to its original shape and is placed in the blood vessel.

When collecting or correcting the position of the placed filter 13, hook the wire at the collecting part at the end of the filter with a hook and pull it toward the outside of the body as shown in FIG. Can be pulled in and removed outside the body. Also, when the filter 12 is used, like the filter 13, the outer diameter of the filter 12 is reduced from the insertion port of the sheath, the filter 12 is inserted into the lumen of the sheath, and pushed out from the tip of the sheath by the insertion catheter. The filter 12 returns to the original shape at the pushed-out position and is left in the blood vessel as shown in FIG.

[0011]

EXAMPLES The present invention will be described in detail with reference to the drawings. As shown in FIG. 1, the wire rod 1A is combined with the wire rod 1B at an angle of 45 °, and the combined wire rod 1C is combined with the wire rods 1A and 1B. Next, the contact portion of the wire rod 1A wire rod 1B wire rod 1C is welded.

When the present invention is used, the tip of the sheath is left indwelling at the target site of the internal blood vessel from outside the body, and the diameter of the filter 13 is reduced from the end opening of the sheath and inserted into the sheath. Next, the filter 13 is pushed out from the catheter by a pushing catheter as shown in FIG. 7, the diameter of the filter 13 is enlarged, and the filter 13 is left in the blood vessel.

The wire rods 1, 2 and 3 are made of stainless alloy,
Alloys such as titanium alloys are preferred. Thickness is 0.3 mm ~
0.5 mm is desirable. The length of the wire is preferably 4 cm to 5 cm.

The angle of adhesion of the wire is preferably 45 °, but may be arbitrarily selected depending on the blood vessel. The required number of wires is arbitrary.

The wire may have a rod shape, but an arched shape can also be used.

Further, a part of the wire may be bent as shown in FIG. The shape does not matter as long as it achieves the object of the present invention.

Further, a ring can be formed at the end portion of the filter 13 as shown in FIG.

The wire rod may be formed in an arbitrary shape as shown in FIG. 4, but may be in the form of a mesh as shown in FIG. An alloy wire is desirable for the material of the capturing part. The shape and the material may be any shape as long as the shape and the material of the capturing portion can achieve the object of the present invention.

The contact portion can be fixed by welding, but a tubular member can be used as the reinforcing portion as shown in FIG. Any reinforcing method and material can be used as long as they can achieve the object of the present invention.

As for the shape of the stopper, the end of the wire can be processed into a hook shape as shown in FIG. 12, but the end of the wire can be bent to form a ring as shown in FIG.

A wire can be passed through the ring as shown in FIG. 16 to form a collecting portion.

Further, as shown in FIG. 15, one end of the filter 13 can be processed into a spiral shape.

As shown in FIG. 17 or 8, the collecting portion can be made by providing a ring on the wire portion, and the wire can be passed through the ring.

As shown in FIG. 10, the recovery unit can contract the expanded filter, and can be performed by a ring and a wire.

The shape of the recovery part is not limited as long as it achieves the object of the present invention.

The second embodiment will be described in detail with reference to the drawing. As shown in FIG. 2, a wire is processed into a triangular wave shape, and one end and the other end of the wire are welded together. Next, as shown in FIG. 5, the capturing part is attached to the inside of the wire.

When using this, the outer diameter of the filter 12 is reduced from the end of the sheath left in the target site to the inner lumen of the sheath, and the filter 12 is inserted. Next, push the push catheter into the sheath lumen from the end of the sheath and push it toward the sheath tip.

Then, the filter is extruded from the sheath, expanded in the blood vessel, and the trapping portion is closed, and the filter is placed as shown in FIG.

The shape of the trap 2 can be attached inside the filter 12, as shown in FIG. 5, from the peak at one end to the peak at the other end.

The material and shape of the trapping portion are preferably alloy wires such as platinum alloy wire and stainless alloy, but any shape and material that achieves the object of the present invention may be used.

Further, as shown in FIG. 18, the trap can be formed by using only the peak at one end of the filter. FIG. 18 shows a filter having 6 peaks. It is also possible to make multiple capturing parts.

Further, as shown in FIG. 19, the capturing portion may be made of a wire material having an arbitrary shape.

Further, the peak can be ring processed as shown in FIG.

The wire material is preferably an alloy such as a stainless alloy or a titanium alloy. The diameter of the wire is 0.2mm
0.8 mm is desirable. Filter diameter is 30mm-4
0 mm is desirable, and the length is desirably 10 mm to 50 mm.

Further, a stopper can be formed on the filter 12 as shown in FIG. The stopper is preferably hook-shaped. The stopper may have any shape and position that achieves the object of the present invention.

The filter 12 is made by processing a wire material, but the folding width may be arbitrary.

As shown in FIG. 21, one end of the filter 12 and the other end of the other filter 12 can be connected to each other by a thin wire as shown in FIG. Also, it may be connected by welding.

Further, as shown in FIG. 19, a collecting section can be formed in the filter 12.

The shape of the collecting part is not limited as long as the filter 12 can be collected.

[0040]

EFFECTS OF THE INVENTION With the above-mentioned construction, a) the wire rod automatically returns to its original shape inside the blood vessel by simply pushing it out of the sheath, the trapping part opens, and the thrombus can be trapped. It can be used even if you are not a person. (B) Since the filter is in a state of capturing the thrombus simply by pushing it out of the sheath, the operation can be completed in a short time. C) Since both ends of the filter are always in contact with the blood vessel wall, stability is good and it does not easily collapse and move. D) Since the filter has a structure that does not easily fall, thrombus does not pass through due to the filter falling. E) Since a collection part can be made in the filter,
Can be collected and moved.

[Brief description of drawings]

FIG. 1 is a side view of the filter of the present invention.

[Fig. 2] Side view of triangular wavy wire

FIG. 3 is a side view of the present invention provided with a reinforcing portion.

FIG. 4 is a side view of the present invention provided with a capturing portion.

FIG. 5 is a side view of the second embodiment.

FIG. 6 is a side view of the first embodiment when the outer diameter is reduced.

FIG. 7 is a side view of Example 1 indwelling in a blood vessel.

FIG. 8 is a side view in which the reinforcing portion and the collecting portion are provided in the first embodiment.

FIG. 9 is a side view of the second embodiment indwelling.

FIG. 10 is a side view of the first embodiment during collection.

FIG. 11 is a side view in which a bent portion is provided in the first embodiment.

FIG. 12 is a side view showing a stopper provided in the first embodiment.

FIG. 13 is a side view in which the ring and the stopper are provided in the first embodiment.

FIG. 14 is a side view in which the capturing unit is provided in the first embodiment.

FIG. 15 is a side view in which a vortex part is formed at one end of the first embodiment.

FIG. 16 is a side view showing a wire provided in the first embodiment.

FIG. 17 is a side view of the first embodiment provided with a plurality of rings.

FIG. 18 is a front view of the second embodiment.

FIG. 19 is a side view of the second embodiment provided with a capturing portion.

FIG. 20 is a side view showing a stopper provided in the second embodiment.

FIG. 21 is a side view of an indwelling example in which a filter is connected.

FIG. 22 is a side view of a conventional indwelling technology.

[Explanation of symbols]

1 wire rod 1A wire rod 1B wire rod 1C wire rod 2 contact portion 3 curved portion 4 V-shaped filter shaft 5 net-like fiber 6th 7 sheath 8 pushing catheter 9 ring 10 wire 11 reinforcement portion 12 filter 13 filter 14 trapping portion 16 stopper 17 blood vessel lumen 18 hooks

Claims (8)

[Claims] 1. A filter provided with any number of wire rods of any shape at any angle. 2. The filter according to claim 1, wherein a trap having an arbitrary shape is provided. 3. The filter according to claim 1, wherein a reinforcing portion is provided at a contact portion of the wire. 4. The filter according to claim 1, wherein a stopper having an arbitrary number and an arbitrary shape is provided on an arbitrary portion of the wire. 5. The filter according to claim 1, 2, 3 or 4, wherein an arbitrary number and an arbitrary type of collecting portion are provided on an arbitrary portion of the wire. 6. A filter in which a wire rod is processed into a corrugated shape, both ends of the wire rod are fixed, and a trap portion having an arbitrary shape is provided at an arbitrary portion. 7. The filter according to claim 6, wherein an arbitrary number of stoppers are provided on an arbitrary portion of the wire. 8. The filter according to claim 6, wherein a recovery part of any shape is provided on any part of the wire.