A controllable release filter

Abstract

The application discloses a controllable release filter, which comprises a filter unit and a push rod unit, the push rod unit comprises a push rod body, a semicylindrical side plate fixedly connected with the push rod body and an insertion protrusion fixedly connected with the side plate; the filter unit comprises a head unit and a plurality of support units connected with the head unit, the support unit comprises a support rod, a barb connected with the support rod, a transition rod connected with the support rod and an extension rod connecting the transition rod and the head unit, the head unit is in the shape of a circular ring column and is provided with a semicylindrical ring-shaped groove, and the semicylindrical ring-shaped groove is further provided with a groove part; when the push rod unit and the head unit are spliced, the side plate is located in the semicylindrical ring-shaped groove, and the insertion protrusion is inserted into the groove part. The filter can realize more accurate controllable release, and can better anchor the blood vessel after release.

Description

Technical Field

[0001] This application relates to the field of medical devices, specifically to a controlled-release filter. Background Technology

[0002] Currently, the filters widely used in clinical practice are generally made of nickel-titanium alloy with shape memory effect. Before implantation, the filter, pre-compressed in a slender delivery sheath, is delivered to the target location in the inferior vena cava under image guidance. Then, the filter is gradually released from its constricted state by withdrawing the outer sheath or pushing the inner core. The filter returns to its preset shape under the influence of body temperature and anchors itself in the blood vessel.

[0003] However, a "bouncing" or "jumping" phenomenon can easily occur at the moment of filter release. Specifically, the filter's elastic potential energy is converted into kinetic energy the instant it detaches from the delivery sheath, causing it to bounce. This results in the filter deviating from its intended position after release. Furthermore, during release, the operator may find the release position unsatisfactory. In such cases, it is difficult to retract the filter back into the sheath for re-release, leading to an unsatisfactory final implantation position. Additionally, after implantation, it is desirable for the filter to anchor more stably to the blood vessel. Summary of the Invention

[0004] Purpose of the invention: This application aims to overcome the shortcomings of the prior art and provide a filter with controllable release.

[0005] Technical Solution: A controllable release filter includes a filter unit and a push rod unit. The push rod unit includes a push rod body, a semi-cylindrical side plate fixedly connected to the push rod body, and an insertion protrusion fixedly connected to the side plate. The filter unit includes a head unit and multiple support units connected to the head unit. The support unit includes a support rod, barbs connected to the support rod, a transition rod connected to the support rod, and an extension rod connecting the transition rod and the head unit. The head unit is annular cylindrical in shape and has a semi-circular cylindrical groove. The semi-circular cylindrical groove also has a recessed portion. When the push rod unit and the head unit are assembled, the side plate is located in the semi-circular cylindrical groove, and the insertion protrusion is inserted into the recessed portion.

[0006] Therefore, when the filter unit and the push rod unit are spliced ​​together and located inside the sheath, due to the cooperation of the insertion protrusion and the groove, the push rod always remains controllable over the filter before the head unit and the push rod unit are completely separated from the sheath. When the release position is not appropriate, the filter can be retracted into the sheath and the filter can be released again.

[0007] Furthermore, the head unit has a first identification mark.

[0008] Furthermore, each support rod has a second identification mark at its end.

[0009] This allows for better development and positioning of the filter.

[0010] Furthermore, when the filter is deployed, the support rod and transition rod are curved, the extension rod is straight, and the extension rod is parallel to the length direction of the head unit.

[0011] Therefore, when the filter's extension rod is pushed out of the sheath, the filter's elastic potential energy has been basically released, and the filter will not bounce when it is released again.

[0012] Furthermore, the number of support units is greater than or equal to 6, and when the filter is deployed, the multiple support units are distributed in a ring with equal spacing.

[0013] Furthermore, the groove portion can be used for the recycling of the filter unit, and the groove portion is hook-shaped.

[0014] Therefore, the groove can be used not only for the initial splicing and locking with the push rod, but also for the subsequent recycling of the filter.

[0015] Furthermore, it also includes a clamping unit, which includes a movable plate, a movable rod fixedly connected to the movable plate, and multiple clamping rods connected to the movable rod. The number of clamping rods is equal to the number of support units, and the two correspond one-to-one. Each clamping rod is connected to one support unit. An end plate is fixedly connected to the head unit. The end plate has a through hole through which the movable rod passes. The head unit has a tension spring. One end of the tension spring is connected to the movable plate, and the other end is connected to the end plate. The movable plate has a limiting groove, and a limiting protrusion is fixed to the end plate. The semi-circular cylindrical groove of the head unit has a first insertion hole and a second insertion hole. A first insertion block and a second insertion block are fixed to the side plate. When the push rod unit and the head unit are spliced, the first insertion block is inserted into the first insertion hole and into the limiting groove, and the second insertion block is inserted into the second insertion hole and abuts against the limiting protrusion. The tension spring is in a stretched state.

[0016] Furthermore, the tension spring is passed through by the movable rod.

[0017] Furthermore, the connection point between the clamping rod and the support unit is located at the connection point between the support rod and the transition rod.

[0018] This allows the clamping rod to achieve better clamping of the support rod.

[0019] Furthermore, both the first and second insert blocks are wedge-shaped.

[0020] Furthermore, the cross-sections of both the limiting groove and the limiting protrusion are triangular.

[0021] The wedge shape allows the first insertion block to disengage more easily from the first insertion hole and the second insertion block to disengage more easily from the second insertion hole when the head unit detaches from the sheath. When the head unit detaches from the sheath, under the tension of the tension spring, the first insertion block is easily squeezed out of the first insertion hole and the second insertion block is easily squeezed out of the second insertion hole.

[0022] Furthermore, the clamping rod is bent when the filter is deployed.

[0023] Beneficial effects: The filter of this application can achieve controllable and precise release by inserting protrusions and grooves between the push rod and the head unit, thereby reducing the difficulty of filter release operation.

[0024] Because the filter of this application has a clamping unit, the clamping force between the filter and the blood vessel sidewall is relatively small before it is fully released, but after the filter is released, a better clamping force can be achieved between the filter and the blood vessel sidewall. Attached Figure Description

[0025] Figure 1 A first-person perspective schematic diagram showing the separation of the filter unit and the push rod unit;

[0026] Figure 2 for Figure 1 Enlarged view of region A in the middle;

[0027] Figure 3 for Figure 1 Enlarged view of region B in the middle;

[0028] Figure 4 A second-view schematic diagram showing the separation of the filter unit and the push rod unit;

[0029] Figure 5 for Figure 4 Enlarged view of region C;

[0030] Figure 6 This is a schematic diagram showing the filter unit and push rod unit assembled together.

[0031] Figure 7 for Figure 6 Enlarged view of region D in the middle;

[0032] Figure 8 This is a cross-sectional view of the filter unit and push rod unit when separated.

[0033] Figure 9 for Figure 8 Enlarged view of region E in the middle;

[0034] Figure 10 for Figure 8 Enlarged view of the middle F region;

[0035] Figure 11 for Figure 8 Enlarged view of region G in the middle;

[0036] Figure 12 This is a cross-sectional view of the filter unit and push rod unit after assembly.

[0037] Figure 13 for Figure 12 Enlarged view of region H in the middle. Detailed Implementation

[0038] Reference numerals: 1.1 Extension rod; 1.2 Transition rod; 1.3 Support rod; 1.4 Barb;

[0039] 2. Head unit; 2.1 Semi-circular annular cylindrical groove; 2.2 Groove portion; 2.3 First insertion hole; 2.4 Second insertion hole; 2.5 End plate; 2.5.1 Through hole; 2.5.2 Limiting protrusion;

[0040] 3. Push rod unit; 3.1 Side plate; 3.2 Insertion protrusion; 3.3 First insertion block; 3.4 Second insertion block;

[0041] 4.1 Clamping rod; 4.2 Movable rod; 4.3 Movable plate; 4.3.1 Limiting groove; 4.4 Tension spring.

[0042] As shown in the figure, a controllable release filter includes a filter unit and a push rod unit 3. The push rod unit 3 includes a push rod body, a semi-cylindrical side plate 3.1 fixedly connected to the push rod body, and an insertion protrusion 3.2 fixedly connected to the side plate 3.1. The filter unit includes a head unit 2 and multiple support units connected to the head unit 2. The support unit includes a support rod 1.3, a barb 1.4 connected to the support rod 1.3, a transition rod 1.2 connected to the support rod 1.3, and an extension rod 1.1 connecting the transition rod 1.2 and the head unit 2. The head unit 2 is annular cylindrical and has a semi-circular cylindrical groove 2.1. The semi-circular cylindrical groove 2.1 also has a groove portion 2.2. When the push rod unit 3 and the head unit 2 are spliced, the side plate 3.1 is located in the semi-circular cylindrical groove 2.1, and the insertion protrusion 3.2 is inserted into the groove portion 2.2.

[0043] When the filter is deployed, the support rod 1.3 and transition rod 1.2 are curved, while the extension rod 1.1 is straight and parallel to the length direction of the head unit 2. The number of support units is greater than or equal to six, and when the filter is deployed, the multiple support units are distributed in a ring with equal spacing. The groove 2.2, which is hook-shaped, can be used for the recovery of the filter unit.

[0044] The filter of this application also includes a clamping unit, which includes a movable plate 4.3, a movable rod 4.2 fixedly connected to the movable plate 4.3, and a plurality of clamping rods 4.1 connected to the movable rod 4.2. The number of clamping rods 4.1 is equal to the number of support units and the two correspond one-to-one. Each clamping rod 4.1 is connected to one support unit. An end plate 2.5 is fixedly connected to the head unit 2. The end plate 2.5 has a through hole 2.5.1 through which the movable rod 4.2 passes. The head unit 2 has a tension spring 4.4. One end of the tension spring 4.4 is connected to the movable plate 4.3, and the other end is connected to the end plate. 2.5 Connection; The movable plate 4.3 has a limiting groove 4.3.1, the end plate 2.5 is fixed with a limiting protrusion 2.5.2, the head unit 2 has a first insertion hole 2.3 and a second insertion hole 2.4 in the semi-circular cylindrical groove 2.1, and the side plate 3.1 is fixed with a first insertion block 3.3 and a second insertion block 3.4. When the push rod unit 3 and the head unit 2 are spliced, the first insertion block 3.3 is inserted into the first insertion hole 2.3 and into the limiting groove 4.3.1, the second insertion block 3.4 is inserted into the second insertion hole 2.4 and abuts against the limiting protrusion 2.5.2, and the tension spring 4.4 is in a stretched state.

[0045] The tension spring 4.4 is passed through the movable rod 4.2; the connection point of the clamping rod 4.1 with the support unit is located at the connection point of the support rod 1.3 and the transition rod 1.2. Both the first insert 3.3 and the second insert 3.4 are wedge-shaped. When the filter is deployed, the clamping rod 4.1 is bent.

[0046] The filter of this application can be spliced ​​together with the filter unit and the push rod unit and housed in the sheath. At this time, the head unit and the push rod unit are spliced ​​together, the insertion protrusion is inserted into the groove, and the first insertion block is inserted into the first insertion hole to abut against the limiting groove, and the second insertion block is inserted into the second insertion hole to abut against the limiting protrusion, thereby making the tension spring in a stretched state.

[0047] When the filter reaches the designated position within the blood vessel, the push rod can push the filter forward, gradually releasing it from the sheath. Since the head unit and push rod unit are still connected before the filter is fully released, if the release position is inappropriate, the filter can be retracted back into the sheath through the cooperation of the push rod and the sheath (and at this time, because the tension spring is stretched, the movable plate is farther from the end plate, resulting in a weaker clamping effect of the clamping rod on the support unit, making it easier to retract the support unit into the sheath). After adjusting to the appropriate position, the filter is released again. When the filter is released from the sheath, and the extension rod is at the front of the sheath, since the extension rod is also in a straight line after the filter is fully released, the elastic potential energy of the filter support unit has been largely released at this position. Therefore, when subsequent filters are pushed out of the sheath, filter bounce is less likely. Furthermore, once the head unit is completely detached from the sheath, the insertion protrusion can detach from the groove, and the first insertion block can detach from the first insertion hole, while the second insertion block can detach from the second insertion hole. At this point, the tension spring shortens, and the movable plate moves towards the end plate, thereby allowing the clamping rod to exert greater pressure on the support unit. This allows the filter to be more stably anchored to the inner wall of the blood vessel via the barbs, resulting in a more stable position after the filter is implanted.

[0048] Although the present invention has been illustrated and described with reference to preferred embodiments, those skilled in the art should understand that various changes and modifications can be made to the present invention without departing from the scope defined by the claims.

Claims

1. A controllable release filter, characterized in that, The system includes a filter unit, a push rod unit, and a clamping unit. The push rod unit comprises a push rod body, a semi-cylindrical side plate fixedly connected to the push rod body, and an insertion protrusion fixedly connected to the side plate. The filter unit includes a head unit and multiple support units connected to the head unit. Each support unit includes a support rod, barbs connected to the support rod, a transition rod connected to the support rod, and an extension rod connecting the transition rod and the head unit. The head unit is annular-cylindrical in shape and has a semi-circular-cylindrical groove, which also has a recessed portion. When the push rod unit and the head unit are assembled, the side plate is located within the semi-circular-cylindrical groove, and the insertion protrusion is inserted into the recessed portion. The clamping unit includes a movable plate, a movable rod fixedly connected to the movable plate, and multiple... A clamping rod is connected to the movable rod, the number of which is equal to the number of support units and they correspond one-to-one, with each clamping rod connected to one support unit; an end plate is fixedly connected to the head unit, the end plate has a through hole through which the movable rod passes, and a tension spring is inside the head unit, one end of which is connected to the movable plate and the other end of which is connected to the end plate; a limiting groove is provided at the movable plate, a limiting protrusion is fixed at the end plate, a first insertion hole and a second insertion hole are provided at the semi-circular cylindrical groove of the head unit, and a first insertion block and a second insertion block are fixed at the side plate. When the push rod unit and the head unit are spliced, the first insertion block is inserted into the first insertion hole and into the limiting groove, the second insertion block is inserted into the second insertion hole and abuts against the limiting protrusion, and the tension spring is in a stretched state.

2. The controllable release filter according to claim 1, characterized in that, When the filter is deployed, the support rod and transition rod are curved, the extension rod is straight, and the extension rod is parallel to the length direction of the head unit.

3. The controllable release filter according to claim 1, characterized in that, The number of support units is greater than or equal to 6, and when the filter is deployed, the multiple support units are distributed in a ring with equal spacing.

4. The controllable release filter according to claim 1, characterized in that, The grooved portion is hook-shaped and can be used for the recovery of the filter unit.

5. The controllable release filter according to claim 1, characterized in that, The tension spring is passed through the movable rod; the connection point between the clamping rod and the support unit is located at the connection point between the support rod and the transition rod.

6. The controllable release filter according to claim 1, characterized in that, Both the first and second insert blocks are wedge-shaped.

7. The controllable release filter according to claim 1, characterized in that, When the filter is deployed, the clamping rod is bent.

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