CN109730801B

CN109730801B - Filter recovery device

Info

Publication number: CN109730801B
Application number: CN201811559106.XA
Authority: CN
Inventors: 贾小乐
Original assignee: Lifetech Scientific Shenzhen Co Ltd
Current assignee: Lifetech Scientific Shenzhen Co Ltd
Priority date: 2018-12-19
Filing date: 2018-12-19
Publication date: 2021-06-29
Anticipated expiration: 2038-12-19
Also published as: CN109730801A

Abstract

The invention relates to a filter recovery device, which comprises a sheath tube and a handle assembly connected to the proximal end of the sheath tube, wherein a sheath tube inner cavity penetrating along the axial direction is arranged in the sheath tube, and the distal end area of the sheath tube is provided with a cutting device used for cutting attachments attached to a filter. The invention has the beneficial effects that: the filter recovery device of the present application has a cutting device that can cut open the intima of a blood vessel that has climbed on the filter, thereby enabling the operator to rapidly recover the filter.

Description

Filter recovery device

Technical Field

The invention relates to the technical field of interventional medical instruments, in particular to a filter recovery device.

Background

This section provides background information related to the present disclosure only and is not necessarily prior art.

Pulmonary Embolism (PE) is a common disease, the mortality rate of the pulmonary embolism is high, the mortality rate of the pulmonary embolism without treatment is 20% -30% by data statistics, newly increased cases account for about 0.2% of the population every year, and about 270 million patients are newly increased every year by 13.5 hundred million people in China. The vena cava filter (hereinafter referred to as filter) is clinically proved to be a safe and effective means for preventing pulmonary embolism, the incidence rate of the pulmonary embolism can be greatly reduced, and thrombus falling from the lower cavity is prevented from reaching the lung along the blood flow by placing the filter into the vena cava, so that the pulmonary embolism is prevented.

Clinically, after the filter is implanted into a patient for a period of time, the risk of pulmonary embolism can be greatly reduced or even disappear along with the treatment of the filter, and when the risk of pulmonary embolism is greatly reduced or even disappears, the filter needs to be taken out of the patient, so that the potential safety hazard existing in the case that the filter is implanted into the human body for a long time is reduced. However, the filter can generate certain stimulation to the blood vessel after being implanted into the inferior vena cava for a certain time, so that endothelial cells of the blood vessel can climb and wrap the supporting rod of the filter to different degrees, and the conventional filter recovery device is difficult to take out the filter from the blood vessel.

Therefore, it is necessary to provide a new filter recovery device in order to solve the technical problem that the support rod of the filter is difficult to be taken out from the blood vessel because endothelial cells of the blood vessel cover and wrap the support rod of the filter.

Disclosure of Invention

The invention aims to solve the technical problem of providing a filter recovery device which can rapidly take out a filter aiming at the defect that the filter is difficult to take out in the prior art.

The technical scheme adopted by the invention for solving the technical problems is as follows:

there is provided a filter recovery device comprising a sheath having a sheath lumen therethrough in an axial direction, a distal region of the sheath being provided with a cutting means for cutting an attachment attached to a filter, and a handle assembly connected to a proximal end of the sheath.

In the filter recovery device of the present invention, the cutting device is located at a distal end face of the sheath tube, or located in the lumen of the sheath tube.

In the filter recovery device, the cutting device is positioned in the inner cavity of the sheath tube, and the distance between the cutting device and the distal end face of the sheath tube is 1-20 mm.

In the filter recovery device, the inner cavity of the sheath tube comprises a first inner cavity and a second inner cavity which are communicated, the second inner cavity is positioned at the far end of the first inner cavity, and the inner wall surface of the second inner cavity inclines towards one side of the longitudinal central axis of the sheath tube, so that the inner diameter of the far end of the second inner cavity is smaller than the inner diameter of the near end of the second inner cavity.

In the filter recovery device according to the present invention, an included angle between an inner wall surface of the second lumen and a longitudinal central axis of the sheath tube in a cross section passing through the longitudinal central axis of the sheath tube is 10 ° to 20 °.

In the filter recovery device according to the present invention, the cutting means includes a cutting conductor made of an electrically conductive material, and the filter recovery device further includes an electrically conductive structure electrically connected to the cutting conductor.

In the filter recovery apparatus of the present invention, the cutting means includes a cutting blade.

In the filter recovery device of the present invention, one end of the cutting blade is connected to the sheath tube, the other end of the cutting blade extends obliquely toward the distal end and toward one side of the longitudinal central axis of the sheath tube, and an angle between a line connecting the proximal end and the distal end of the cutting blade and the longitudinal central axis of the sheath tube is 10 ° to 20 °.

In the filter recovery device of the present invention, the cutting blade includes a cutting conductor made of a conductive material, and the filter recovery device further includes a conductive structure electrically connected to the cutting conductor.

And a conductor channel which is isolated from the inner cavity of the sheath tube is arranged in the sheath tube, and the conductive structure is positioned in the conductor channel.

In summary, the filter recovery device of the present invention has the following advantages: the filter recovery device of the present application has a cutting device that can cut open the intima of a blood vessel that has climbed on the filter, thereby enabling the operator to rapidly recover the filter.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:

FIG. 1 is a schematic view of a filter recovery apparatus according to a first embodiment of the present invention;

FIG. 2 is a schematic view of a cutting device of the filter recovery device shown in FIG. 1;

FIG. 3 is a schematic view of the filter recovery apparatus shown in FIG. 1 when recovering a filter;

FIG. 4 is a schematic view of a cutting device of a filter recovery device according to a second embodiment of the present invention;

fig. 5 is a schematic view of a first cutting blade of a filter recovery device according to a third embodiment of the present invention;

fig. 6 is a schematic view of a second cutting blade of a filter recovery apparatus according to a third embodiment of the present invention;

fig. 7 is a schematic view of a third cutting blade of a filter recovery apparatus according to a third embodiment of the present invention;

fig. 8 is a schematic view of a cutting device of a filter recovery device according to a fourth embodiment of the present invention.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.

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 medicine, it is generally defined that the end of the instrument proximal to the operator is the proximal end and the end distal to the operator is the distal end.

Referring to fig. 1, a first embodiment of the present invention provides a filter recovery device 100 including a sheath 11 and a handle assembly 12 connected to a proximal end of the sheath 11, the sheath 11 being provided at a distal end region thereof with a cutting means 13, the cutting means 13 being for cutting an attached matter attached to a filter. Here, the "distal end region of the sheath 11" means a distal end of the sheath 11 and a catheter segment of the sheath 11 located at a distance of 20mm or less from the distal end of the sheath 11.

Referring to fig. 2, the cutting device 13 is a cutting conductor made of a conductive material, and the cutting conductor may be a cutting guide wire or a cutting guide blade. The sheath 11 is provided with a conductive structure 14 electrically connected with the cutting conductor, the cutting conductor is electrically connected with an external power supply device 15 (shown in figure 1) through the conductive structure 14, the endangium attached to the filter can be cut after the cutting conductor is electrified, an operator can rapidly put the filter into the sheath inner cavity 111 of the sheath 11, and the risk that the endangium at the position where the filter is implanted is torn into fragments to induce thrombus regeneration is effectively avoided.

In the embodiment shown in fig. 2, the sheath 11 has a sheath lumen 111 extending therethrough in the axial direction, and the sheath lumen 111 serves as a passage for the recovery filter. The distal end face of the sheath 11 is provided with a groove 112, and the cutting device 13 is mounted in the groove 112. A conductor channel 113 isolated from the sheath lumen 111 is arranged in the sheath 11, one end of the conductor channel 113 is communicated with the groove 112, and the other end of the conductor channel 113 is communicated with the outside through the handle assembly 12. The conductive structure 14 is located in the conductor channel 113, one end of the conductive structure 14 is electrically connected to the cutting device 13 installed in the groove 112, and the other end of the conductive structure 14 is electrically connected to the external power supply device 15.

In this embodiment, the cutting device 13 and the conductive structure 14 are both powered wires, and it is understood that the present application is not limited to the specific structures of the cutting device 13 and the conductive structure 14, the cutting device 13 and the conductive structure 14 may be wire-shaped or sheet-shaped structures made of conductive materials such as copper and nickel titanium in any form, and the cutting device 13 and the conductive structure 14 may be connected by welding, thermal shrinkage locking, and other processes.

In actual preparation, after the sheath tube 11 is molded, the grooves 112 or the conductor channels 113 for mounting the cutting device 13 and the conductive structure 14 are respectively made. In addition, as a modified example of the present embodiment, the cutting means 13 may be bonded to the distal end surface of the sheath tube 11 by an adhesive material without providing the groove 112. The conductive structure 14 may be bonded to the inner wall or the outer wall of the sheath tube 11 by a bonding material without providing the conductor passage 113.

In this embodiment, the cutting device 13 is disposed on the distal end surface of the sheath tube 11, and after a portion of the filter that is not attached to the inner skin is received in the sheath tube inner cavity 111, the cutting device 13 can directly stick to the inner skin of the blood vessel climbing over the filter, and after the cutting device 13 is powered on, the inner membrane of the blood vessel climbing over the filter can be cut off more quickly and safely under the action of high voltage, so that the cutting effect is ensured to be more effective, and the filter can be received in the sheath tube 11 quickly.

Referring again to fig. 1, the handle assembly 12 includes a housing 120, and a communication tube 121 and a connection device 122 disposed on the housing 120.

Wherein the housing 120 is substantially hollow and is connected to the proximal end of the sheath 11. The housing 120 is provided with a first opening (not shown) communicating with the conductor channel 113, through which the conductive structure 14 is electrically connected with an external power supply device 15, and the power supply device 15 can be electrically connected with the conductive structure 14 by an electrical connection method known in the art.

The housing 120 is further provided with a second opening (not shown) communicated with the inner cavity 111 of the sheath tube, the communication pipe 121 is connected to the housing 120 and communicated with the second opening, and an operator can inject an injection object such as liquid or gas into the inner cavity 111 of the sheath tube through the communication pipe 121 to ensure the drainage or exhaust function of the whole device. A connection device 122 is provided at the proximal end of the housing 120 for use with an auxiliary accessory (e.g., a dilator) during surgery. It should be noted that the communication tube 121 and the connection device 122 of the present application may adopt common apparatuses in the art, and the specific structures thereof are not described herein again.

Further, the distal region of the sheath 11 is provided with a visualization structure (not shown) to facilitate the operator to accurately position the distal end of the sheath 11 during the surgical procedure. In this embodiment, the visualization structure is located at the distal region of the sheath lumen 111. It is understood that the present embodiment does not limit the specific structure of the sheath 11, the sheath 11 may be a single-layer sheath, or may be a multi-layer sheath, and when the sheath 11 is a multi-layer sheath, the conductor channel 113 may be located between two adjacent layers of sheaths.

Referring to fig. 3, the first embodiment of the present application has the following specific formula: after venipuncture is completed, the sheath 11 is pushed into the inferior vena cava 20, the catcher 21 is pushed into the inferior vena cava 20 through the sheath lumen 111, and after the catching ring of the catcher 21 is connected with the recovery hook of the filter 22, the sheath 11 is pushed forward, so that the filter 22 is gradually retracted into the sheath lumen 111. When the filter 22 is crawled by intimal cells, it may be impossible to withdraw the filter into the sheath. Therefore, when the recovery resistance is too large, the cutting device 13 can be energized, and the cutting device 13 cuts the intimal cell attached to the filter after energization, so that the operator can promptly take the filter into the sheath lumen 111.

Referring to fig. 4, a filter recovery apparatus 100 according to a second embodiment of the present invention is substantially the same as the filter recovery apparatus according to the first embodiment, and the filter recovery apparatus 100 includes a sheath 11 and a cutting device 13 provided at a distal end region of the sheath 11, and the cutting device 13 is a cutting conductor made of a conductive material for cutting an attached matter attached to a filter. The sheath 11 is provided with a conductive structure 14 electrically connected to the cutting conductor, the cutting conductor is electrically connected to an external power supply 15 (shown in fig. 1) through the conductive structure 14, and the intima attached to the filter can be cut after the cutting conductor is energized, so that the operator can quickly put the filter into the sheath lumen 111. The second embodiment differs from the first embodiment in that the cutting means 13 is located on the inner wall of the sheath lumen 111.

Because the cutting device 13 is positioned on the inner wall of the inner cavity 111 of the sheath tube, part of the vascular intima attached to the filter can be firstly collected into the sheath tube 11 during the operation, and then the vascular intima is cut, so that the intact inner wall of the blood vessel is prevented from being damaged when the cutting device 13 is used for cutting. If the distance between the cutting device 13 and the distal end face of the sheath tube 11 is too large, a large amount of blood vessel intima needs to be collected into the sheath tube 11 for cutting, so that the recovery resistance is too large, and the operation is time-consuming, labor-consuming and inconvenient. If the distance between the cutting device 13 and the distal end surface of the sheath tube 11 is too small, the inner wall of the intact blood vessel is easily damaged when cutting the blood vessel intima. Therefore, in the present embodiment, the distance between the cutting device 13 and the distal end surface of the sheath 11 is 1mm to 20mm, preferably 2mm to 5 mm.

In the embodiment shown in fig. 4, a groove 112 is provided on the inner wall of the sheath lumen 111, and the cutting device 13 is mounted in the groove 112. A conductor channel 113 isolated from the sheath lumen 111 is arranged in the sheath 11, one end of the conductor channel 113 is communicated with the groove 112, and the other end of the conductor channel 113 is communicated with the outside. The conductive structure 14 is located in the conductor channel 113, one end of the conductive structure 14 is electrically connected to the cutting device 13 installed in the groove 112, and the other end of the conductive structure 14 is electrically connected to the external power supply device 15.

In actual preparation, after the sheath tube 11 is molded, the grooves 112 or the conductor channels 113 for mounting the cutting device 13 and the conductive structure 14 are respectively made. In addition, as a modified example of the present embodiment, the cutting means 13 may be bonded to the inner wall of the sheath lumen 111 by an adhesive material without providing the groove 112. The conductive structure 14 may be bonded to the inner wall or the outer wall of the sheath tube 11 by a bonding material without providing the conductor passage 113.

Referring to fig. 5, a third embodiment of the present invention provides a filter recovery apparatus 100, which is substantially the same as the filter recovery apparatus of the first embodiment, the filter recovery apparatus 100 including a sheath tube 11 and a cutting device 13 provided at a distal end region of the sheath tube 11. The third embodiment differs from the first embodiment in that the cutting means 13 is a cutting blade which can directly cut the intima of the blood vessel that has climbed over the filter.

In the embodiment shown in fig. 5, sheath lumen 111 includes a first lumen 111a and a second lumen 111b communicating with each other, and the inner wall surface of second lumen 111b is inclined toward one side of the longitudinal center axis of sheath 11 such that the inner diameter of the distal end of second lumen 111b is smaller than the inner diameter of the proximal end. The cutting blade is generally annular and is located at the distal end of the second lumen 111b and is disposed around the distal end of the second lumen 111 b.

This application sets up cutting blade into the ring form, can increase cutting device 13 and the area of contact of blood vessel intima, will climb the blood vessel intima of attaching on the filter and open rapidly, guarantee that the cutting is more effective. Moreover, the inner diameter of the far end of the second inner cavity 111b is smaller than the inner diameter of the near end of the second inner cavity 111b, so that the tightness between the cutting blade and the surface of the filter can be increased, and the cutting quality and the safety factor when the cutting blade cuts the vascular intima attached to the filter are greatly improved.

In a cross section passing through the longitudinal central axis of the sheath tube 11, an angle α between the inner wall surface of the second lumen 111b and the longitudinal central axis of the sheath tube 11 is 10 ° to 20 °. If the included angle α is too large, the opening of the distal end face of the sheath tube 11 will be too small, which is not favorable for recovering the filter into the sheath tube 11; if the included angle α is too small, the cutting blade cannot effectively approach the surface of the filter for cutting, and damage to the inner wall of the intact blood vessel cannot be effectively avoided.

It is understood that the present embodiment does not limit the specific location of the cutting blade on the sheath 11, and in other embodiments, the cutting blade may be disposed on the inner wall of the sheath lumen 111, wherein the distance between the cutting blade and the distal end surface of the sheath 11 is 1mm to 20mm, preferably 2mm to 5 mm. Because the cutting blade is positioned on the inner wall of the sheath tube inner cavity 111, part of the vascular intima attached to the filter can be firstly collected into the sheath tube 11 during operation, and then the vascular intima is cut, so that the intact vascular inner wall is prevented from being damaged during cutting. It is also understood that the present embodiment is not limited to a specific configuration of the sheath lumen 111, for example, in other embodiments, the inner diameter of the sheath lumen 111 is constant at all times.

It will also be understood that the present embodiment does not limit the specific structure of the cutting blade, for example, in the embodiment shown in fig. 6, the cutting device 13 comprises a plurality of cutting blades, which are uniformly distributed along the circumferential direction and surround the sheath lumen 111. Specifically, one end of each cutting blade is fixed on the distal end face of the sheath tube 11, and the other end of each cutting blade is inclined towards one side of the longitudinal central axis of the sheath tube 11, and at this time, the included angle β between the connecting line between the proximal end and the distal end of each cutting blade and the longitudinal central axis of the sheath tube 11 is 10 ° to 20 °, so as to increase the degree of adherence between the cutting blade and the surface of the filter. If the included angle β is too large, it is not favorable to retrieve the filter into the sheath tube 11, and if the included angle β is too small, the cutting blade cannot be effectively attached to the surface of the filter for cutting, and damage to the intact inner wall of the blood vessel cannot be effectively avoided. In the embodiment shown in fig. 7, the cutting blade is an annular serrated blade and surrounds the distal opening of the sheath 11, and the concave-convex structure of the annular serrated blade can increase the contact area between the cutting blade and the vascular intima, thereby improving the cutting efficiency and the cutting quality of the cutting blade.

Referring to fig. 8, a filter recovery apparatus 100 according to a fourth embodiment of the present invention is substantially the same as the filter recovery apparatus according to the third embodiment, and the filter recovery apparatus 100 includes a sheath 11 and a cutting device 13 provided at a distal end region of the sheath 11, and the cutting device 13 is a cutting blade which directly cuts an intima of a blood vessel which has climbed over the filter.

The fourth embodiment differs from the third embodiment in that the cutting blade is made of a conductive material, a conductive structure 14 electrically connected to the cutting blade is provided in the sheath 11, the cutting blade is electrically connected to an external power supply device 15 (shown in fig. 1) through the conductive structure 14, the cutting conductor is energized to cut the intima that has climbed over the filter, and the operator can quickly retract the filter into the sheath lumen 111 of the sheath 11.

In the embodiment shown in fig. 8, the sheath lumen 111 includes a first lumen 111a and a second lumen 111b communicating with each other, and the inner wall surface of the second lumen 111b is inclined toward one side of the longitudinal center axis of the sheath 11 such that the inner diameter of the second lumen 111b at the distal end is smaller than the inner diameter at the proximal end. In a cross section passing through the longitudinal central axis of the sheath tube 11, an angle α between the inner wall surface of the second lumen 111b and the longitudinal central axis of the sheath tube 11 is 10 ° to 20 °. The cutting blade is generally annular and is located at the distal end of the second lumen 111b and is disposed around the distal end of the second lumen 111 b. A conductor channel 113 isolated from the sheath lumen 111 is arranged in the sheath 11, one end of the conductor channel 113 is communicated with the groove 112, and the other end of the conductor channel 113 is communicated with the outside through the handle assembly 12. The conductive structure 14 is located in the conductor channel 113, one end of the conductive structure 14 is electrically connected to the cutting device 13 installed in the groove 112, and the other end of the conductive structure 14 is electrically connected to the external power supply device 15.

In this embodiment, after the part that is not crawled by the endothelium of filter is received in sheath pipe inner chamber 111, cutting blade can directly cut the vascular intima of climbing on the filter, when the recovery resistance is still too big, can make cutting blade circular telegram, can cut open the vascular intima cell of climbing on the filter rapidly after cutting blade circular telegram, guarantees that the cutting effect is more effective.

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 express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A filter retrieval device comprising a sheath having an axially extending sheath lumen therethrough and a handle assembly attached to a proximal end of the sheath, wherein a distal region of the sheath is provided with a cutting means for cutting an attachment attached to a filter, the cutting means being located on a distal end face of the sheath or within the sheath lumen.

2. The filter recovery device of claim 1, wherein the cutting device is located within the lumen of the sheath tube at a distance of 1mm to 20mm from the distal end face of the sheath tube.

3. The filter recovery device of claim 1, wherein the sheath lumen comprises a first lumen and a second lumen in communication, the second lumen being located at a distal end of the first lumen, an inner wall surface of the second lumen being sloped toward a side of a longitudinal center axis of the sheath such that a distal inner diameter of the second lumen is smaller than a proximal inner diameter of the second lumen.

4. The filter recovery device according to claim 3, wherein an angle between an inner wall surface of the second lumen and a longitudinal center axis of the sheath tube in a cross section passing through the longitudinal center axis of the sheath tube is 10 ° to 20 °.

5. The filter recovery device of claim 1, wherein the cutting device comprises a cutting conductor made of an electrically conductive material, the filter recovery device further comprising an electrically conductive structure electrically connected to the cutting conductor.

6. The filter recovery device of claim 1 wherein the cutting device comprises a cutting blade.

7. The filter recovery device according to claim 6, wherein one end of the cutting blade is connected to the sheath, the other end of the cutting blade extends obliquely toward the distal end and toward one side of the longitudinal center axis of the sheath, and an angle between a line connecting the proximal end and the distal end of the cutting blade and the longitudinal center axis of the sheath is 10 ° to 20 °.

8. The filter recovery device of claim 6 wherein the cutting blade comprises a cutting conductor made of an electrically conductive material, the filter recovery device further comprising an electrically conductive structure electrically connected to the cutting conductor.

9. The filter recovery device of claim 5 or 8, wherein the sheath has a conductor channel therein isolated from the lumen of the sheath, the electrically conductive structure being located in the conductor channel.