# US 11,439,492 B2 · Lasso filter tipped microcatheter for simultaneous rotating separator, irrigator for thrombectomy and method for use

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- Number: US 11,439,492 B2
- Document ID: US11439492B2
- Status: Granted
- Kind: B2
- Application number: 16/501,593
- Filed: 2019-05-02
- Published: 2019-08-29
- Granted: 2022-09-13
- Earliest claimed: 2016-09-07
- Applicants: Daniel Ezra Walzman
- Inventors: Daniel Ezra Walzman
- Web page: https://patentgrep.com/patent/US11439492B2

## CPC

- A61F 2/013: {Distal protection devices, i.e. devices placed distally in combination with another endovascular procedure, e.g. angioplasty or stenting}
- A61B 8/06: Measuring blood flow
- A61B 8/12: in body cavities or body tracts, e.g. by using catheters
- A61B 17/22: Implements for squeezing-off ulcers or the like on inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; for invasive removal or destruction of calculus using mechanical vibrations; for removing obstructions in blood vessels, not otherwise provided for
- A61B 17/22012: {in direct contact with, or very close to, the obstruction or concrement (for removing obstructions in blood vessels by laser A61B18/245)}
- A61B 17/2202: {the ultrasound transducer being inside patient's body at the distal end of the catheter}
- A61B 17/32037: {for removing obstructions from inner organs or blood vessels, e.g. for atherectomy}
- A61B 17/3207: Atherectomy devices {working by cutting or abrading; Similar devices specially adapted for non-vascular obstructions (A61B17/32037 takes precedence; endoscopic cutting instruments A61B17/320016)}
- A61B 17/320758: {with a rotating cutting instrument, e.g. motor driven (A61B17/320725, A61B17/32075 and A61B17/320783 take precedence; for removing intra-ocular material A61F9/00763; endoscopic rotatable cutting instruments A61B17/32002)}
- A61B 17/320783: {through side-hole, e.g. sliding or rotating cutter inside catheter}
- A61M 25/0021: {characterised by the form of the tubing (A61M25/0054 takes precedence)}
- A61M 25/007: {Side holes, e.g. their profiles or arrangements; Provisions to keep side holes unblocked}
- A61B 8/0891: {for diagnosis of blood vessels}
- A61B 2017/00876: {magnetic}
- A61B 2017/00955: {thermoplastic}
- A61B 2017/22039: {eccentric}
- A61B 2017/22051: {with an inflatable part, e.g. balloon, for positioning, blocking, or immobilisation (A61B2017/22048, A61B2017/3486 take precedence)}
- A61B 2017/22067: {Blocking; Occlusion (A61B2017/22054 takes precedence)}
- A61B 2017/22079: {with suction of debris}
- A61B 2017/22084: {stone- or thrombus-dissolving}
- A61B 2017/320716: {comprising means for preventing embolism by dislodged material}
- A61B 2017/320733: {with a flexible cutting or scraping element, e.g. with a whip-like distal filament member}
- A61B 2017/320775: {Morcellators, impeller or propeller like means}
- A61B 2090/3784: {both receiver and transmitter being in the instrument or receiver being also transmitter}
- A61B 2090/3966: {Radiopaque markers visible in an X-ray image}
- A61B 2217/005: with suction drainage system
- A61B 2217/007: with irrigation system
- A61F 2/011: {Instruments for their placement or removal}
- A61F 2002/018: {made from tubes or sheets of material, e.g. by etching or laser-cutting}
- A61M 25/0026: {Multi-lumen catheters with stationary elements (catheter assemblies comprising a catheter in combination with a guide tube, sheath or sleeve A61M2025/0681; catheters comprising telescoping coaxial elements A61M2025/0175)}
- A61M 25/0032: {characterized by at least one unconventionally shaped lumen, e.g. polygons, ellipsoids, wedges or shapes comprising concave and convex parts}
- A61M 25/0068: {Static characteristics of the catheter tip, e.g. shape, atraumatic tip, curved tip or tip structure}
- A61M 2025/0024: {Expandable catheters or sheaths}
- A61M 2025/0042: {Microcatheters, cannula or the like having outside diameters around 1 mm or less}
- A61M 2025/1052: {for temporarily occluding a vessel for isolating a sector}
- A61F: FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS (dental prosthetics A61C)
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)
- A61M: DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY (introducing media into or onto the bodies of animals A61D7/00; means for inserting tampons A61F13/26; devices for administering food or medicines orally A61J; containers for collecting, storing or administering blood or medical fluids A61J1/05); DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY (surgery A61B; chemical aspects of surgical articles A61L); DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR {(Electrotherapy, e.g. producing anaesthesia by the use of alternating or intermittent currents A61N1/36021)}

## Abstract

The invention provides a filter assembly including a string or wire such that a lasso type cincture is effected, said filter being openable and closeable while in deployed within a bodily vessel. A string lengthen or shorting adjustment mechanism, such as a ratchet or reel allows more length of string into the device or alternatively to shorten the length of available string in the system. The described invention, when used to ameliorate venous clots and most arterio-venous dialysis grafts, a filter-tipped aspirator is used downstream from the clot to capture and remove dislocated emboli. A method of using same is disclosed.

## Claims

### Claim 1

An endovascular device for capturing emboli comprising:
(a) a elongated member having a proximal portion, a distal portion, a lumen, a first opening at the proximal portion and a second opening at the distal portion;
(b) a flared, semi-permeable filter adapted to allow passage of blood cells and serum and to capture emboli, the filter having a proximal rim at a proximal segment, a distal rim at a distal segment, and an attachment region at one of the proximal rim or distal rim, the filter protruded from the lumen of the elongated member, the filter movable between expanded and collapsed configurations, wherein when in the expanded configuration, the filter contacts an inner wall of a vessel such that blood flowing through the vessel travels through said filter;
(c) a rewinding mechanism positioned proximal of the attachment region; and
(d) a cinching member extending from the rewinding mechanism to the distal segment of the filter, the cinching member extending within the elongated member from said rewinding mechanism and along a length of the filter, and a portion of the cinching member extending circumferentially around a portion of the filter, the cinching member slidably disposed around the portion of the filter forming a lasso-like component configured to close the filter around the captured emboli for removal of the filter with the captured emboli, wherein the filter is closed external of the elongated member and is withdrawn into the lumen of the elongated member;
(e) wherein a diameter of the filter is greater at the distal segment than the proximal segment in the expanded configuration of the filter;
(f) wherein when the filter is released to expand circumferentially, the cinching member is dispensed from the rewinding mechanism in order to increase the length of the portion of the cinching member extending circumferentially around the distal rim;
(g) wherein when the distal segment is collapsed by rewinding the portion of the cinching member, the portion of the cinching member extending circumferentially around the distal rim of the filter is decreased.

### Claim 2 (depends on 1)

The device according to claim 1, wherein the distal segment of the filter has at least one peripheral channel that extends around a circumference of a distal segment, the cinching member slidable within the channel to cinch the distal segment to collapse the filter.

### Claim 3 (depends on 2)

The device according to claim 2, wherein the filter further comprises at least one longitudinal channel along the length of the filter which contains the cinching member.

### Claim 4 (depends on 1)

The device according to claim 1, wherein the filter further comprises a circumferential channel for receiving the cinching member, the channel extending circumferentially around the filter.

### Claim 5 (depends on 1)

The device according to claim 1, further comprising a set of hoops extending from the distal rim, the cinching member extending thought the set of hoops and slidable therethrough for cinching the distal segment of the filter.

### Claim 6 (depends on 1)

The device according to claim 1, wherein the cinching member is a string or a wire.

### Claim 7 (depends on 1)

The device according to claim 1, wherein the rewinding mechanism is a reel.

### Claim 8 (depends on 1)

The device according to claim 1, wherein the elongated member has at least one working lumen extending therein through which other medical devices can be advanced to a location beyond the filter, and through the filter, without displacing the filter.

### Claim 9 (depends on 8)

The device according to claim 8, wherein the distal segment of the filter is capable of deployment within an ascending aorta, and the at least one working lumen can deliver a cardiac valve device.

### Claim 10 (depends on 1)

The device according to claim 1, wherein the elongated member is steerable.

### Claim 11 (depends on 1)

The device according to claim 1, which the elongated member has at least one bend.

### Claim 12 (depends on 1)

The device according to claim 1, wherein the filter is self-expanding upon release from an external constraint.

### Claim 13 (depends on 1)

The device according to claim 1, wherein the elongated member is composed of a shape-memory polymer causing at least one area of said elongated member to bend after a period of time in a patient's body.

### Claim 14 (depends on 1)

The device according to claim 1, wherein the device is attachable to an external aspirator and the lumen is configured for aspiration of particles therethrough.

### Claim 15 (depends on 1)

The device according to claim 1, wherein the cinching member is in a wall of the elongated member.

### Claim 16

An endovascular device for capturing emboli comprising:
(a) an elongated member having a proximal portion, a distal portion, an aspiration lumen, a first opening at the proximal portion and a second opening at the distal portion;
(b) a semi-permeable filter protruded from the lumen and positioned at the distal portion of the elongated member and adapted to allow passage of blood cells and serum and to capture emboli the filter having a proximal rim at a proximal segment, a distal rim at a distal segment, the filter movable between collapsed and expanded configurations; and
(c) a tensioning member extending through the elongated member and attached to the filter to form a lasso, wherein the tensioning member is retractable to move the filter to the collapsed configuration configured to close the filter around the captured emboli for removal of the filter with the captured emboli, wherein the filter is closed external of the elongated member and is withdrawn into the lumen of the elongated member.

### Claim 17 (depends on 16)

The device according to claim 16, wherein the tensioning member is a string or a wire.

### Claim 18 (depends on 16)

The device according to claim 16, further comprising a retraction mechanism, wherein the retraction mechanism includes a reel which winds to control a tension of the tensioning member to effect moving of the filter to the collapsed configuration.

### Claim 19 (depends on 16)

The device according to claim 16, wherein the filter is flared and extends from the distal portion of the elongated member.

### Claim 20 (depends on 16)

The device according to claim 16, wherein the elongated member includes a channel within a wall of said elongated member through which the tensioning member passes and the tensioning member extends around a periphery of a portion of the filter.

### Claim 21 (depends on 16)

The device according to claim 16, wherein the filter includes a plurality of hoops disposed around the circumference of the filter through which the tensioning member passes.

### Claim 22 (depends on 20)

The device according to claim 20, wherein the filter includes a channel through a circumference of the filter in which the tensioning member passes.

### Claim 23 (depends on 16)

The device according to claim 16, wherein the filter has a distal region having a diameter greater than a diameter of a proximal region in the expanded configuration.