# US 11,298,140 B2 · Patient-matched instrumentation and methods

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- Number: US 11,298,140 B2
- Document ID: US11298140B2
- Status: Granted
- Kind: B2
- Application number: 16/410,295
- Filed: 2019-05-13
- Published: 2019-08-29
- Granted: 2022-04-12
- Earliest claimed: 2010-10-14
- Assignees: Smith & Nephew, Inc.
- Applicants: Smith & Nephew, Inc.
- Inventors: Zachary Christopher Wilkinson; Brian W. McKinnon; David Timothy Mehl; Luke Andrew Gibson; Scott Kennedy Laster
- Web page: https://patentgrep.com/patent/US11298140B2

## CPC

- A61B 17/157: {Cutting tibia}
- A61B 17/02: for holding wounds open, e.g. retractors; Tractors
- A61B 17/1703: {using imaging means, e.g. by X-rays}
- A61B 17/56: Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B 2017/320052: {Guides for cutting instruments}
- A61B 2017/568: {produced with shape and dimensions specific for an individual patient}
- A61F 2/38: for elbows or knees
- 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

A patient-matched cutting block including a surface or point contact features adapted to at least partially conform to or reference a patient specific anatomy. The cutting block having guide slots configured for guiding the movement of cutting tools relative to the patient specific anatomy or features configured to mate to and guide standard cutting guides relative to patient specific anatomy in order to form plateau and eminence resections of the patient specific anatomy.

## Claims

### Claim 1

A patient matched cutting block comprising:
a body having a bone-facing side and an exterior surface, the bone-facing side comprising a surface or point contact feature adapted to at least partially conform to or reference a patient specific anatomy, the bone-facing side is established in pre-surgical planning based on imaging data of the patient specific anatomy;
at least one guide slot configured for guiding a movement of cutting tools;
one or more provisional fixation pins, each of the one or more provisional fixation pins including a predetermined length based on the imaging data of the patient specific anatomy; and
one or more apertures configured to receive and guide placement of the one or more provisional fixation pins, respectively;
wherein each of the one or more apertures contains a position control element configured to contact a shoulder on each of the one or more provisional fixation pins to control a depth of the provisional fixation pins so that, in use, with the provisional fixation pins fully inserted, the provisional fixation pins are arranged and configured to extend adjacent to a posterior side of a patient's tibia without piercing the patient's tibia.

### Claim 2 (depends on 1)

The block of claim 1, wherein the exterior surface on a central portion of the body is calibrated to the patient specific anatomy and to the predetermined length of the provisional fixation pins.

### Claim 3 (depends on 1)

The block of claim 1, wherein the position control elements comprise laser etched lines or other indicia to indicate an anterior-posterior depth of the provisional fixation pins.

### Claim 4 (depends on 1)

The block of claim 1, comprising: a visualization window positioned in a central portion of the body for visualizing anterior portions of a tibial eminence.

### Claim 5 (depends on 4)

The block of claim 4, wherein the visualization window is revealed by breaking off a frangible portion.

### Claim 6 (depends on 1)

The block of claim 1, comprising: at least one reinforcement to increase rigidity of at least a portion of the body.

### Claim 7 (depends on 6)

The block of claim 6, wherein the at least one reinforcement is embedded in the body.

### Claim 8 (depends on 6)

The block of claim 6, wherein the at least one reinforcement is formed from a material having different properties than a material of the body.

### Claim 9 (depends on 8)

The block of claim 8, wherein the at least one reinforcement is formed from stainless steel and the body is formed from Nylon-12.

### Claim 10 (depends on 9)

The block of claim 9, wherein the at least one reinforcement and the body are formed by selective laser sintering.