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CN-114681107-B - Implantable device Filter for lumen

CN114681107BCN 114681107 BCN114681107 BCN 114681107BCN-114681107-B

Abstract

The invention relates to the technical field of implanted medical instruments, in particular to an intracavity implant structure, in particular to a vena cava filter, and particularly discloses an intracavity implant structure and a vena cava filter with the same, comprises a central part with a central axis and a functional part with an outer periphery, wherein the functional part is composed of a plurality of rods extending outwards from the central part, the arrangement, structure and shape of the rods constituting the functional part are improved, so that the implant has better neutral effect.

Inventors

  • ZHAO XIANGQIAN
  • CHEN YILONG

Assignees

  • 深圳市科奕顿生物医疗科技有限公司

Dates

Publication Date
20260505
Application Date
20211223
Priority Date
20201225

Claims (20)

  1. 1. The implantable lumen filter is characterized by comprising a central component which can be detachably connected with a conveying device, wherein the conveying device is used for conveying the filter in a lumen, a plurality of anchoring members and a plurality of filtering members are arranged around the central component at intervals and limited by the central component for realizing positioning and filtering in the lumen, the filter is provided with an unbound state and a radially compressed implantation state, the anchoring members and the filtering members are configured to be elastically deformed under compression load in the implantation state and have radial elastic force larger than that of the filtering members under the same radial dimension after compression, the plurality of anchoring members and the plurality of filtering members are arranged in layers along the axial direction of the filter, the plurality of anchoring members are arranged into one layer to form an anchoring part with an outer edge diameter, the plurality of filtering members are arranged into another layer to form a filtering part with the outer edge diameter, the anchoring part is closer to the filtering part than the central component in the axial direction, the anchoring members and each filtering member can be coupled with each other by the group of the plurality of anchoring members and/or each group of the group of filtering members through the mutual coupling between the plurality of the anchoring members and the group of the filtering members.
  2. 2. The filter according to claim 1, wherein the anchor portion has a smaller peripheral diameter than the filter portion when the filter is in an unbound state.
  3. 3. The filter according to claim 1, wherein one end of the center member in the axial direction of the filter is provided with a connecting portion for connecting with the delivery device, and the other end of the center member is provided with a recovery portion which can be caught by a recovery device for moving the implanted filter within a lumen.
  4. 4. The filter according to claim 3, wherein the anchor portion and the filter portion are located on a side of the connecting portion of the center member in the axial direction of the filter.
  5. 5. The filter according to claim 3, wherein the center member is a hub, the connection portion of the center member is a screw thread provided on an inner periphery of the hub and is screwed to the delivery device, and the recovery portion of the center member is a hook-shaped body formed by grooving the hub or a hook-shaped body attached to the hub and is captured by the recovery device having a collar.
  6. 6. The filter according to claim 1, wherein the anchor member has a deformable load-buffering structure of a curved configuration for buffering compressive loads.
  7. 7. The filter of claim 6, wherein elastic deformation of the anchor members within each set activates the filter members and the coupling members, and/or wherein elastic deformation of the filter members within each set activates the anchor members and the coupling members.
  8. 8. The filter according to claim 7, wherein the anchor member or the filter member is actuated at least in a radial direction of the filter.
  9. 9. The filter according to claim 6, wherein the anchor members and the filter members in the set are arranged offset from each other in the circumferential direction of the filter.
  10. 10. The filter according to claim 6, wherein the anchor member, the filter member, and the coupling member are rod-shaped members, wherein the coupling member is led out from the center part and extends to a distal end thereof in a direction away from the center part, one anchor member and two filter members extending outward of the coupling member are led out from the distal end of each coupling member, and the led-out one anchor member is located between the two filter members.
  11. 11. The filter according to claim 10, wherein the coupling member has a bent portion adjacent to the distal end thereof, the coupling member becomes smaller in an angle with the axial center line of the center section in a distal direction thereof after passing through the bent portion, the filter member extends axially along the filter below the bent portion, and two adjacent filter members led out from the adjacent two coupling members extend toward each other and form movable contact.
  12. 12. The filter of claim 11, wherein the anchor member is substantially coplanar with the coupling member from which it exits, and wherein the anchor member extends toward the tail section thereof in a generally U-shaped or V-shaped curved configuration, forming a load-buffering structure.
  13. 13. The filter according to claim 12, wherein the tail section of the anchor member is located axially above the bend in the filter and toward the central member.
  14. 14. The filter of claim 10, wherein the anchor member and the filter member have a stem width that is less than the stem width of the coupling member and the anchor member has a length that is less than the length of the filter member and greater than the length of the coupling member.
  15. 15. The filter of claim 1, wherein the anchor member and the filter member are both non-invasive intraluminal wall structures.
  16. 16. The filter according to claim 1, wherein the filter is a thrombus filter implantable in the inferior vena cava.
  17. 17. The filter of any of claims 1-16, wherein the anchor member and the filter member are configured to have different radial compression ratios, respectively, at the same radial dimension after compression, wherein the anchor member has a radial compression ratio of less than 30% at a radial dimension after compression of 18-32 mm, the filter member has a radial compression ratio of greater than 50%, and the anchor member has a radial elastic force value that is 2-8 times the radial elastic force value that the filter member has, wherein radial compression ratio refers to a ratio of a difference in radial length variation before and after compression to a radial length before compression.
  18. 18. The filter of claim 17, wherein the anchor member has a radial spring force of 0.2 to 0.8N and the filter member has a radial spring force of 0.05 to 0.2N.
  19. 19. An implantable lumen filter comprising a central member removably connectable to a delivery device for delivering the filter within a lumen, a plurality of anchor members and a plurality of filter members spaced around and retained by the central member for positioning and filtering within the lumen, the plurality of anchor members and the plurality of filter members being arranged in layers along an axial direction of the filter, wherein the plurality of anchor members are arranged in one layer forming an anchor portion having an outer diameter and the plurality of filter members are arranged in another layer forming a filter portion having an outer diameter, a radial support force of the anchor portion being greater than a radial support force of the filter portion, the anchor portion being closer to the central member than the filter portion in the axial direction, the plurality of anchor members and the plurality of filter members being correspondingly arranged in groups, the anchor members and filter members within each group being connected by a coupling member, the anchor members and filter members within each group being coupleable or elastically deformable by the anchor members within each group being coupled to each other.
  20. 20. The filter according to claim 19, wherein the number of anchor members constituting the anchor portion is not greater than the number of filter members constituting the filter portion, wherein the anchor member and the filter member are configured to be elastically deformed by a compression load in an implanted state and to have a radial elastic force greater than that of the filter member at the same radial dimension after compression.

Description

Implantable device Filter for lumen Technical Field The invention relates to the technical field of implanted medical instruments, in particular to an intraluminal implant, and particularly relates to a vena cava filter. Background Implanted medical devices are medical devices that can be left in the body for a short or long period of time, are used to support and sustain life, are potentially dangerous to the human body, and must be tightly controlled for their safety and effectiveness. Expandable implantable medical devices such as vascular stents, vena cava filters, occluders, ventricular volume reduction devices and the like can be implanted into a human body cavity through interventional procedures by being compressed to a very small volume, and after the compressed devices are released and expanded at a required position in the body, the treatment effect is realized, such as expanding, supporting, blocking, volume reduction or preventing circulation of thrombus and the like in blood vessels, body cavities and the like. Whether temporarily placed for a short period of time or implanted for a long period of time or for a lifetime, stringent requirements are placed on the shape of the implanted compression device after release expansion in the body, e.g. the longitudinal long axis of the implant should generally remain in the center of the implanted body cavity, i.e. the implant has good neutrality, which may otherwise lead to reduced or lost function of the implant. However, good neutrality may be difficult to achieve. A typical case is a parachute-type vena cava Filter such as Gunther Tulip TM Filter and Celect TM Filter sold by William Cook company, related documents such as US5324304A, CN101031254A. The filter is mainly formed by arranging or weaving an elongated support body to form a self-expanding umbrella-shaped body filtering part so as to prevent thrombus in veins from passing through the filter, wherein at least one end of the elongated support body is assembled at the central position of the umbrella-shaped body, and a release or recovery part, such as a recovery hook, is usually arranged at the central position and is used for releasing or recovering the umbrella-shaped body in cooperation with a recovery device such as a sheath tube. The parachute-shaped vena cava filter lacks effective limit near the recovery hook, and the probability of filter inclination during and during filter implantation is high. The filter inclination is defined as the included angle of the filter longitudinal axis and the central longitudinal axis of the vena cava >15 degrees, and serious filter inclination causes that the recovery hooks are attached to or adhered to the wall of the inferior vena cava, umbrella-shaped expansion is uneven, and serious events such as incapacity of the filter, reduced thrombus filtering effect, perforation and the like are caused. The reasons for the filter inclination may be related to factors such as the main vein pulsation, gastrointestinal motility, the anatomy of the inferior vena cava itself, and the location of the filter placement. Improved filter arrangements have been disclosed, for example in patent publications US20100049239A1, WO2018120414A1, CN105193521A, CN102470028A, which add a stop mechanism near the recovery hooks, with the effect of improving filter tilting, improving neutrality. However, these improved filter constructions still have drawbacks, such as the fact that the spacing means are usually constituted by rods provided on the filter, which, when provided in a longer or greater number, contributes to an improved neutrality effect, while at the same time significantly increasing the difficulty of releasing the filter, in particular, the greater the number of rods, which lead to a more complex control and adjustment of the release attitude of the filter, the greater the deviation in position of the rods released first, which may lead to an amplified deviation in position of the rods released later, and the greater the axial distance of the two rods along the filter, which is more unavoidable. In another typical case, when the delivery sheath for loading the filter is not coaxial with the lumen of the vein, the extension space of the rod in each direction when released from the delivery sheath into the lumen of the vein is different, and the probability of lateral deflection or release of morphological abnormality of the rod near the inner wall of the lumen is higher. These conditions can lead to tilting of the filter or uneven spatial distribution of the rods of the filter within the venous lumen, which can ultimately lead to failure of the filter to recover, reduced effectiveness in filtering thrombi, and various complications. In addition, the filter has more rods, which cause an increase in resistance when it is released from the sheath, and the release operation in the body cavity will have difficulty in using a large force due to its fineness, further resul