# US 10,307,291 B2 · Vitrectomy surgical apparatus with cut timing based on pressures encountered

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- Number: US 10,307,291 B2
- Document ID: US10307291B2
- Status: Granted
- Kind: B2
- Application number: 15/354,204
- Filed: 2016-11-17
- Published: 2017-03-09
- Granted: 2019-06-04
- Earliest claimed: 2012-12-17
- Assignees: Johnson & Johnson Surgical Vision, Inc.
- Applicants: Abbott Medical Optics Inc.
- Inventors: Fred C. Lee; James B. Gerg; Kyle E. Lynn; Zheng Zhang; Lauren M. Hickey
- Web page: https://patentgrep.com/patent/US10307291B2

## CPC

- A61F 9/00763: {with rotating or reciprocating cutting elements, e.g. concentric cutting needles (atherectomy cutting instruments A61B17/3207; endoscopic cutting instruments A61B17/320016)}
- A61B 17/3205: Excision instruments
- A61F 9/00736: {Instruments for removal of intra-ocular material or intra-ocular injection, e.g. cataract instruments (A61F9/008 takes precedence)}
- A61B 2017/00017: {Electrical control of surgical instruments}
- A61B 2017/00022: {Sensing or detecting at the treatment site}
- A61B 2017/00544: {pneumatically}
- 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)

## Abstract

A vitrectomy apparatus is provided, including a pressure source, a cut valve connected to the pressure source, the cut valve configured to be turned on and off to provide pressure to selectively extend and retract a vitrectomy cutting device, a sensor configured to sense pressure provided from the cut valve, and a controller configured to control operation of the cut valve based on pressure sensed by the sensor. The controller is configured to monitor pressures encountered and alter cut valve timing based on pressure conditions previously encountered.

## Claims

### Claim 1

A method for performing a vitrectomy procedure, comprising:
sensing pressure provided from a pressure source through a cut valve and to a vitrectomy handpiece; and
controlling operation of the cut valve based on pressure sensed;
wherein controlling operation of the cut valve based on pressure sensed comprises monitoring and maintaining a peak pressure value and a trough pressure value and altering cut valve timing based on pressure conditions previously encountered;
wherein the peak pressure value represents a maximum pressure encountered and the trough pressure value represents a minimum pressure encountered.

### Claim 2 (depends on 1)

The method of claim 1, wherein controlling operation of the cut valve comprises altering cut valve timing based on a pressure encountered relative to the peak pressure valve and the trough pressure value.

### Claim 3 (depends on 2)

The method of claim 2, wherein controlling operation of the cut valve comprises monitoring a time starting from issuing a command to the cut valve and one from the group consisting of the peak pressure value and the trough pressure value, and altering a future command time for a future command issued to the cut valve based on the time.

### Claim 4 (depends on 3)

The method of claim 3, wherein controlling operation of the cut valve comprises issuing the command to the cut valve when the pressure encountered reaches a threshold pressure calculated based on the time and one from the group consisting of peak pressure value and the trough pressure value.

### Claim 5 (depends on 3)

The method of claim 3, wherein controlling operation of the cut valve comprises setting the peak pressure to be a presently encountered peak pressure when the presently encountered peak pressure is greater than any previously encountered peak pressure.

### Claim 6 (depends on 3)

The method of claim 3, wherein controlling operation of the cut valve comprises setting the trough pressure to be a presently encountered trough pressure when the presently encountered trough pressure is less than any previously encountered trough pressure.

### Claim 7 (depends on 1)

The method of claim 1, wherein the cut valve is pneumatically connected to a pump, a sensor, and the vitrectomy handpiece.