# US 8,465,436 B2 · Endoluminal implant with locking and centering fixation system

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- Number: US 8,465,436 B2
- Document ID: US8465436B2
- Status: Granted
- Kind: B2
- Application number: 12/768,235
- Filed: 2010-04-27
- Published: 2011-10-27
- Granted: 2013-06-18
- Earliest claimed: 2010-04-27
- Assignees: Medtronic Vascular, Inc.
- Applicants: Erik Griswold
- Inventors: Erik Griswold
- Web page: https://patentgrep.com/patent/US8465436B2

## CPC

- A61B 5/02152: {specially adapted for venous pressure}
- A61B 5/0031: {Implanted circuitry}
- A61B 5/6862: {Stents}
- A61F 2/82: Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents (stent-grafts for tubular structures of the body other than blood vessels A61F2/04; stent-grafts for blood vessels A61F2/07)
- A61F 2250/0002: for data transfer
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)
- 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)

## Abstract

An implant centering system includes a sensor connected to a hollow cylindrical anchor via at least two struts. The hollow cylindrical anchor is transformable between a radially compressed configuration for delivery and a radially expanded configuration for lodging against a vessel wall. The struts longitudinally relocate the sensor between a first position in which the sensor is longitudinally spaced apart from the radially compressed anchor, and a second position in which the sensor is at least partially within a lumen of the radially expanded anchor and radially centered within vessel. In one embodiment, the struts are heat-set into a curved configuration and an externally applied force longitudinally relocates the sensor until the struts lock over center into their heat-set configuration. In another embodiment, radial expansion of the anchor longitudinally relocates the sensor without an externally applied force.

## Claims

### Claim 1

An implant centering system comprising:
a sensor;
a hollow cylindrical anchor transformable between a radially compressed configuration operable for delivery within a vasculature and a radially expanded configuration operable for lodging against a vessel wall; and
at least two struts each having a first end connected to the sensor and a second end connected to the anchor;
wherein the at least two struts are configured such that as the anchor transforms between the radially compressed configuration and the radially expanded configuration the at least two struts longitudinally relocate the sensor between a first position in which the sensor is longitudinally spaced apart from the radially compressed anchor and a second position in which the sensor is at least partially located within a lumen of the radially expanded anchor.

### Claim 2 (depends on 1)

The implant centering system of claim 1, wherein the anchor is self-expanding.

### Claim 3 (depends on 1)

The implant centering system of claim 1, wherein the anchor is balloon-expandable.

### Claim 4 (depends on 1)

The implant centering system of claim 1, wherein the at least two struts are generally straightened when the sensor is in the first position.

### Claim 5 (depends on 1)

The implant centering system of claim 1, wherein the at least two struts curve longitudinally inward within the radially expanded anchor when the sensor is in the second position.

### Claim 6 (depends on 5)

The implant centering system of claim 5, wherein at least a portion of the at least two struts are heat set in a shape to curve longitudinally within the lumen of the radially expanded anchor.

### Claim 7 (depends on 5)

The implant centering system of claim 5, wherein an externally applied force deforms the at least two struts to curve longitudinally inward and lock over-center.

### Claim 8 (depends on 5)

The implant centering system of claim 5, wherein radial expansion of the anchor longitudinally relocates the sensor into the second position.

### Claim 9 (depends on 1)

The implant centering system of claim 1, wherein each of the at least two struts extend from the sensor to the anchor in the same longitudinal direction.

### Claim 10 (depends on 1)

The implant centering system of claim 1, wherein the second end of each of the at least two struts is connected to the anchor an equal longitudinal distance from a first end of the anchor.

### Claim 11 (depends on 5)

The implant centering system of claim 5, wherein each of the at least two struts curves more than 90°.