A wall-stripping filter

Abstract

The application discloses a wall-avoiding filter, which comprises a head unit and a plurality of support units connected with the head unit, wherein the support unit comprises a support rod, a first auxiliary rod, a second auxiliary rod and two connecting rods connecting the support rod and the head unit; the support rod is provided with a first insertion slot; the first auxiliary rod comprises a first extension rod connected with the head unit, a first transition rod connected with the first extension rod, a second transition rod connected with the first transition rod and a first insertion rod connected with the second transition rod, and the first insertion rod is inserted into the first insertion slot; the first extension rod is provided with a second insertion slot; the second auxiliary rod comprises a second extension rod connected with one end of the second insertion slot, a third transition rod connected with the second extension rod, a fourth transition rod connected with the third transition rod and a second insertion rod connected with the fourth transition rod. The filter can better avoid wall adhesion due to the first auxiliary rod and the second auxiliary rod.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of medical devices, in particular to a filter against wall sticking. BACKGROUND

[0002] Filter is a key medical device widely used for preventing pulmonary embolism. Through percutaneous puncture delivery system, a filter mesh device is implanted into the blood vessel to intercept thrombus, so as to avoid the thrombus entering the pulmonary artery with the blood flow to cause fatal embolism. Within and after three months, the filter generally needs to be recovered after treatment. The ideal filter should have good thrombus capturing ability, stable anchoring performance, excellent biocompatibility, and can exist in the blood vessel for a long time.

[0003] However, the existing filter has a defect of filter wall sticking. When the filter is released in the blood vessel, due to the uneven radial support force of the leg of the filter, the irregular shape of the blood vessel or the influence of blood flow dynamics, the recovery hook of the filter may not be in the central flow channel of the blood vessel, but close to the inner wall of the blood vessel. Thus, when the filter is recovered by using the recovery hook, the difficulty is increased. Long-term wall sticking even causes endothelialization of the recovery hook, thereby further increasing the difficulty of filter recovery. Although some existing filters prevent filter wall sticking by increasing radial support structures, for example, the patent CN218010068U discloses a inferior vena cava filter, which avoids wall sticking of the recovery hook by setting an umbrella-shaped support structure. However, there are often problems of complex structure and poor anti-wall sticking effect. SUMMARY

[0004] The present application aims to overcome the defects of the prior art and provide a filter against wall sticking.

[0005] Technical scheme: A filter against wall sticking, comprising a head unit and a plurality of support units connected with the head unit, the support unit comprising a support rod, a first auxiliary rod, a second auxiliary rod and two connecting rods connecting the support rod and the head unit; the support rod has a first insertion slot, the first auxiliary rod comprises a first expansion rod connected with the head unit, a first transition rod connected with the first expansion rod, a second transition rod connected with the first transition rod and a first insertion rod connected with the second transition rod, the first insertion rod being inserted into the first insertion slot; the first expansion rod has a second insertion slot, the second auxiliary rod comprises a second expansion rod connected with one end of the second insertion slot, a third transition rod connected with the second expansion rod, a fourth transition rod connected with the third transition rod and a second insertion rod connected with the fourth transition rod.

[0006] Further, the end of the support rod has a barb, the inner side of the support rod has a first developing strip, the end of the first extension rod has a second developing strip; the length of the first developing strip is greater than the length of the second developing strip, and the width of the first developing strip is greater than the width of the second developing strip.

[0007] Further, the head unit has a developing mark.

[0008] Thus, the developing positioning of the head unit can be realized.

[0009] Further, a plurality of first limiting plates for preventing the first insertion rod from being separated from the first slot are fixed at the first slot.

[0010] Further, the plurality of first limiting plates are equidistantly distributed in a row.

[0011] Further, a plurality of second limiting plates for preventing the second insertion rod from being separated from the second slot are fixed at the second slot.

[0012] Further, the plurality of second limiting plates are equidistantly distributed in a row.

[0013] Further, the head unit is in the shape of a circular columnar tube, and the head unit has a groove part for recycling the filter.

[0014] Further, the groove part is in the shape of a hook. Thus, the groove part is more convenient for recycling the filter.

[0015] In some embodiments, the groove part can not be provided, and a recycling hook is directly fixed at the head unit.

[0016] Further, when the filter is unfolded, the first transition rod protrudes in the direction close to the head unit in the radial direction.

[0017] Further, when the filter is unfolded, the third transition rod protrudes in the direction close to the head unit in the axial direction.

[0018] Further, the support rod, the connecting rod, the first auxiliary rod, and the second auxiliary rod are all made of a memory alloy.

[0019] Further, when the filter is unfolded, the support rod is in a straight line shape, the connecting rod is in a curved shape, the first extension rod is in a straight line shape, the first transition rod and the second transition rod are both in an arc shape, and the second extension rod, the third transition rod, and the fourth transition rod are all in an arc shape.

[0020] Further, when the filter is unfolded, the first insertion rod is in a straight line shape.

[0021] Further, when the filter is unfolded, the second insertion rod is in a straight line shape.

[0022] Further, the support rods, the connecting rods, the first auxiliary rods and the second auxiliary rods are made of nickel-titanium alloy.

[0023] Further, the number of the support rods, the first auxiliary rods and the second auxiliary rods is equal; when the filter is unfolded, the plurality of support rods are distributed in a ring shape at equal intervals, the plurality of first auxiliary rods are distributed in a ring shape at equal intervals, and the plurality of second auxiliary rods are distributed in a ring shape at equal intervals.

[0024] Further, when the filter is unfolded, the two connecting rods connected with the same support rod protrude in opposite directions.

[0025] Further, when the filter is completely located in the sheath, the first insertion rod and the second transition rod are completely located in the first insertion slot, and at least a part of the first transition rod is located in the first insertion slot.

[0026] Further, when the filter is completely located in the sheath, the second expansion rod, the third transition rod, the fourth transition rod and the second insertion rod are completely located in the second insertion slot.

[0027] Therefore, when the filter is not unfolded, most of the first auxiliary rods can be inserted into the first insertion slot, and the second auxiliary rods are completely located in the second insertion slot, so that the filter can be more regularly accommodated in the sheath.

[0028] Beneficial effects: the filter of the present application has the first auxiliary rods and the second auxiliary rods, after the filter is unfolded in the blood vessel, the first auxiliary rods and the second auxiliary rods are also unfolded, so that the head unit can be better prevented from adhering to the wall, thereby reducing the difficulty of subsequent recovery of the filter. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a first perspective view of the filter after unfolding;

[0030] Figure 2 is a second perspective view of the filter after unfolding; Figure 1 is an enlarged view of area A in the middle;

[0031] Figure 3 is a third perspective view of the filter after unfolding;

[0032] Figure 4 is a fourth perspective view of the filter after unfolding; Figure 3 is an enlarged view of area B in the middle;

[0033] Figure 5 is a fifth perspective view of the filter after unfolding;

[0034] Figure 6 is a sixth perspective view of the filter after unfolding; Figure 5 is an enlarged view of area C in the middle. DETAILED DESCRIPTION

[0035] Reference numerals in the attached drawings: 1.1 Support rod; 1.1.1 First slot; 1.1.2 First limiting plate; 1.1.3 First developing strip; 1.2 Connecting rod; 1.3 Head unit; 1.3.1 Groove; 1.4 Barb;

[0036] 2.1 First extension rod; 2.1.1 Second slot; 2.1.2 Second limiting plate; 2.2 First transition rod; 2.3 Second transition rod; 2.4 First insertion rod; 2.4.1 Second developing strip;

[0037] 3.1 Second extension rod; 3.2 Third transition rod; 3.3 Fourth transition rod; 3.4 Second insertion rod.

[0038] like Figures 1-6 As shown, an anti-wall-sticking filter includes a head unit 1.3 and multiple support units connected to the head unit 1.3. Each support unit includes a support rod 1.1, a first auxiliary rod, a second auxiliary rod, and two connecting rods 1.2 connecting the support rod 1.1 and the head unit 1.3. The support rod 1.1 has a first slot 1.1.1. The first auxiliary rod includes a first extension rod 2.1 connected to the head unit 1.3, a first transition rod 2.2 connected to the first extension rod 2.1, a second transition rod 2.3 connected to the first transition rod 2.2, and a first insertion rod 2.4 connected to the second transition rod 2.3. The first insertion rod 2.4 is inserted into the first slot 1.1.1. The first extension rod 2.1 has a second slot 2.1.1. The second auxiliary rod includes a second extension rod 3.1 connected to one end of the second slot 2.1.1, a third transition rod 3.2 connected to the second extension rod 3.1, a fourth transition rod 3.3 connected to the third transition rod 3.2, and a second insertion rod 3.4 connected to the fourth transition rod 3.3. The support rod 1.1 has a barb 1.4 at its end, and a first developing strip 1.1.3 on its inner side. The first extension rod 2.1 has a second developing strip 2.4.1 at its end. The length of the first developing strip 1.1.3 is greater than the length of the second developing strip 2.4.1, and the width of the first developing strip 1.1.3 is greater than the width of the second developing strip 2.4.1. A plurality of first limiting plates 1.1.2 are fixed at the first slot 1.1.1 to prevent the first insert rod 2.4 from disengaging from the first slot 1.1.1. A plurality of second limiting plates 2.1.2 are fixed at the second slot 2.1.1 to prevent the second insert rod 3.4 from disengaging from the second slot 2.1.1.

[0039] The head unit 1.3 is circular annular columnar tube, and the head unit 1.3 has a groove part 1.3.1 for filter recovery. The support rods 1.1, the connecting rods 1.2, the first auxiliary rods and the second auxiliary rods are all made of memory alloy; when the filter is unfolded, the support rods 1.1 are linear, the connecting rods 1.2 are curved, the first extension rods 2.1 are linear, the first transition rods 2.2 and the second transition rods 2.3 are all arc-shaped, and the second extension rods 3.1, the third transition rods 3.2 and the fourth transition rods 3.3 are all arc-shaped. The number of the support rods 1.1, the first auxiliary rods and the second auxiliary rods is equal; when the filter is unfolded, the plurality of support rods 1.1 are annularly and equidistantly distributed, the plurality of first auxiliary rods are annularly and equidistantly distributed, and the plurality of second auxiliary rods are annularly and equidistantly distributed. When the filter is unfolded, the two connecting rods 1.2 connected with the same support rod 1.1 protrude in opposite directions. When the filter is completely located in the sheath, the first insertion rod 2.4 and the second transition rod 2.3 are completely located in the first insertion slot 1.1.1, and at least a part of the first transition rod 2.2 is located in the first insertion slot 1.1.1; the second extension rod 3.1, the third transition rod 3.2, the fourth transition rod 3.3 and the second insertion rod 3.4 are completely located in the second insertion slot 2.1.1.

[0040] The filter of the present application, when the filter is located in the sheath, the second auxiliary rod is completely located in the second insertion slot, and at least a part of the first insertion rod, the second transition rod and the first transition rod is located in the first insertion slot, so that the filter can be more neatly accommodated in the sheath. Therefore, it can be better accommodated in the sheath, and it is easier to be pushed out of the sheath by the push rod.

[0041] When the filter is unfolded, due to the effect of the memory alloy, the filter is unfolded, and after unfolding, as shown in Figures 1-6 the first auxiliary rod is unfolded, and the first transition rod protrudes outward, so that even if the first transition rod abuts against the inner wall of the blood vessel, the head unit will not be attached to the wall. Therefore, the first transition rod can effectively prevent the head unit from being attached to the wall. In addition, the second auxiliary rod will also be unfolded and protrude towards the axis close to the head unit, so that a plurality of third transition rods surround the head unit, so that the head unit is always located in the middle position of the plurality of third transition rods, thereby further preventing the head unit from being attached to the wall, thereby further ensuring that the recovery is more convenient.

[0042] In addition, before the filter is released, the corresponding first and second developing strips are close to each other due to the insertion of the first insertion rod into the first insertion slot. When the filter is unfolded, the second developing strip will be away from the first developing strip due to the unfolding of the first auxiliary rod, so that after the filter is unfolded, according to the positions of the first and second developing strips, it can be judged whether the first auxiliary rod is completely and correctly unfolded, thereby further confirming the success of the implantation operation of the filter.

[0043] Although the present application has been illustrated and described with respect to preferred embodiments, it will be understood by those skilled in the art that various changes and modifications can be made without departing from the scope of the application as defined in the claims.

Claims

1. A filter that prevents wall adhesion, characterized in that, The device includes a head unit and multiple support units connected to the head unit. Each support unit includes a support rod, a first auxiliary rod, a second auxiliary rod, and two connecting rods connecting the support rod and the head unit. Each support rod has a first slot. The first auxiliary rod includes a first extension rod connected to the head unit, a first transition rod connected to the first extension rod, a second transition rod connected to the first transition rod, and a first insert rod connected to the second transition rod, with the first insert rod inserted into the first slot. The first extension rod has a second slot. The second auxiliary rod includes a second extension rod connected to one end of the second slot, a third transition rod connected to the second extension rod, a fourth transition rod connected to the third transition rod, and a second insert rod connected to the fourth transition rod. The support rod... The end has barbs, the inner side of the support rod has a first developing strip, and the end of the first extension rod has a second developing strip; the length of the first developing strip is greater than the length of the second developing strip, and the width of the first developing strip is greater than the width of the second developing strip; a plurality of first limiting plates are fixed at the first slot to prevent the first insert rod from disengaging from the first slot; a plurality of second limiting plates are fixed at the second slot to prevent the second insert rod from disengaging from the second slot; the support rod, connecting rod, first auxiliary rod, and second auxiliary rod are all made of shape memory alloy; when the filter is unfolded, the support rod is straight, the connecting rod is curved, the first extension rod is straight, the first transition rod and the second transition rod are both arc-shaped, and the second extension rod, the third transition rod, and the fourth transition rod are all arc-shaped.

2. The anti-wall-adhesion filter according to claim 1, characterized in that, The head unit is in the shape of a cylindrical tube and has a groove for filter recovery.

3. The anti-wall-adhesion filter according to claim 1, characterized in that, The number of the support rods, the first auxiliary rods, and the second auxiliary rods are equal; when the filter is deployed, the multiple support rods are distributed in a ring with equal spacing, the multiple first auxiliary rods are distributed in a ring with equal spacing, and the multiple second auxiliary rods are distributed in a ring with equal spacing.

4. The anti-wall-adhesion filter according to claim 1, characterized in that, When the filter is deployed, the two connecting rods connected to the same support rod protrude in opposite directions.

5. The anti-wall-adhesion filter according to claim 1, characterized in that, When the filter is fully inside the sheath, the first insert rod and the second transition rod are fully inside the first slot, and at least a portion of the first transition rod is inside the first slot; the second extension rod, the third transition rod, the fourth transition rod, and the second insert rod are fully inside the second slot.

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