# US 10,869,771 B2 · Systems and methods for joint replacement

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- Number: US 10,869,771 B2
- Document ID: US10869771B2
- Status: Granted
- Kind: B2
- Application number: 16/267,737
- Filed: 2019-02-05
- Published: 2019-10-31
- Granted: 2020-12-22
- Earliest claimed: 2009-07-24
- Assignees: OrthAlign, Inc.
- Applicants: OrthAlign, Inc.
- Inventors: Nicholas van der Walt; Charles Shapiro; Richard Lane; Matt Ryan
- Web page: https://patentgrep.com/patent/US10869771B2

## CPC

- A61F 2/4657: {Measuring instruments used for implanting artificial joints (for surgical instruments A61B90/06)}
- G16H 40/67: for remote operation
- A61B 5/0022: {Monitoring a patient using a global network, e.g. telephone networks, internet}
- A61B 5/0077: {Devices for viewing the surface of the body, e.g. camera, magnifying lens}
- A61B 5/1072: {measuring distances on the body, e.g. measuring length, height or thickness (A61B5/1076 takes precedence)}
- A61B 5/1121: {Determining geometric values, e.g. centre of rotation or angular range of movement}
- A61B 5/1127: {using markers}
- A61B 5/1495: Calibrating or testing of in-vivo probes
- A61B 5/4585: {Evaluating the knee}
- A61B 5/7225: {Details of analogue processing, e.g. isolation amplifier, gain or sensitivity adjustment, filtering, baseline or drift compensation (input circuits for detecting, measuring, or recording bioelectric or biomagnetic signals A61B5/30; specific diagnostic methods using bioelectric or biomagnetic signals A61B5/316)}
- A61B 17/155: {Cutting femur}
- A61B 17/157: {Cutting tibia}
- A61B 17/1764: {for the knee}
- A61B 17/56: Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B 34/10: Computer-aided planning, simulation or modelling of surgical operations
- A61B 34/20: Surgical navigation systems; Devices for tracking or guiding surgical instruments, e.g. for frameless stereotaxis
- A61B 2034/108: {Computer aided selection or customisation of medical implants or cutting guides}
- A61B 2034/2048: {using an accelerometer or inertia sensor}
- A61B 2505/05: Surgical care
- A61B 2562/0219: Inertial sensors, e.g. accelerometers, gyroscopes, tilt switches
- A61B 2562/06: Arrangements of multiple sensors of different types
- A61F 2002/4668: {for measuring angles}
- 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)
- G16H: HEALTHCARE INFORMATICS, i.e. INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR THE HANDLING OR PROCESSING OF MEDICAL OR HEALTHCARE DATA
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)

## Abstract

Systems and methods for joint replacement are provided. The systems and methods include a surgical orientation device, a reference sensor device, and at least one orthopedic fixture. The surgical orientation device, reference sensor device, and orthopedic fixtures can be used to locate the orientation of an axis in the body, to adjust an orientation of a cutting plane or planes along a bony surface, or otherwise to assist in an orthopedic procedure(s).

## Claims

### Claim 1

A method of orthopedic surgery, comprising:
coupling an orthopedic fixture to a bone of a patient, wherein the orthopedic fixture comprise a first interface and a second interface,
coupling a first orientation device to the first interface, wherein the first orientation device is configured to sense changes in motion, orientation, and/or position of the bone;
coupling a second orientation device to the second interface, wherein the second orientation device is configured to sense changes in motion, orientation, and/or position of the second orientation device; and
wherein at least one of the first orientation device and the second orientation device is configured to send information about motion, orientation, and/or position of the at least one of the first orientation device and the second orientation device to the other of the first orientation device and the second orientation device.

### Claim 2 (depends on 1)

The method of claim 1, wherein the second orientation device comprises a display.

### Claim 3 (depends on 1)

The method of claim 1, further comprising locating a mechanical axis.

### Claim 4 (depends on 1)

The method of claim 1, further comprising acquiring at least one landmark to determine a point on a mechanical axis passing through the bone.

### Claim 5 (depends on 1)

The method of claim 1, further comprising acquiring a center of rotation.

### Claim 6 (depends on 1)

The method of claim 1, further comprising acquiring at least two landmark to determine a point on a mechanical axis passing through the bone.

### Claim 7 (depends on 1)

The method of claim 1, further comprising performing a tibial resection.

### Claim 8 (depends on 1)

The method of claim 1, further comprising performing a femoral resection.

### Claim 9

A method of orthopedic surgery, comprising:
coupling a first orientation device to a fixed portion of an orthopedic fixture coupled to a bone of a patient, wherein the first orientation device is configured to sense changes in motion, orientation, and/or position of the first orientation device;
coupling a second orientation device to a movable portion of the orthopedic fixture, wherein the second orientation device is configured to sense changes in motion, orientation, and/or position of the second orientation device; and
wherein at least one of the first orientation device and the second orientation device is configured to send information about a motion, orientation, and/or position of the at least one of the first orientation device and the second orientation device to the other of the first orientation device and the second orientation device.

### Claim 10 (depends on 9)

The method of claim 9, wherein the second orientation device comprises a display.

### Claim 11 (depends on 9)

The method of claim 9, further comprising locating a mechanical axis.

### Claim 12 (depends on 9)

The method of claim 9, further comprising performing a tibial resection.

### Claim 13 (depends on 9)

The method of claim 9, further comprising performing a femoral resection.

### Claim 14 (depends on 9)

The method of claim 9, further comprising coupling the second orientation device to a resection guide.

### Claim 15 (depends on 9)

The method of claim 9, wherein the second orientation device provides information indicating whether the second orientation device is aligned with a mechanical axis.

### Claim 16 (depends on 9)

The method of claim 9, wherein the second orientation device provides information indicating whether the second orientation device is aligned with a plane containing a mechanical axis of the bone.

### Claim 17 (depends on 9)

The method of claim 9, wherein the second orientation device provides information indicating whether the second orientation device is aligned with an pre-determined angle.

### Claim 18

A method of orthopedic surgery, comprising:
positioning a first orientation device within a surgical field, wherein the first orientation device is configured to sense changes in motion, orientation, and/or position of the first orientation device;
positioning a second orientation device within the surgical field, wherein the second orientation device is configured to sense changes in motion, orientation, and/or position of the second orientation device; and
wherein at least one of the first orientation device and the second orientation device is configured to send information about an motion, orientation, and/or position of the at least one of the first orientation device and the second orientation device to the other of the first orientation device and the second orientation device.

### Claim 19 (depends on 18)

The method of claim 18, performing a resection based on information provided by at least one orientation device, wherein the resection is a tibial resection.

### Claim 20 (depends on 18)

The method of claim 18, performing a resection based on information provided by at least one orientation device, wherein the resection is a femoral resection.