Testing of pressure sensor in surgical cassette

• US 6,868,720 B2
• Filed: 02/28/2003
• Issued: 03/22/2005
• Est. Priority Date: 10/16/2002
• Status: Expired due to Term

• Current Assignee: Alcon Incorporated
• Original Assignee: Alcon Incorporated
• Inventors: Lobdell, Donn D., Morgan, Michael D.
• Primary Examiner(s): Williams, Hezron
• Assistant Examiner(s): JACKSON, ANDRE K
• Application Number:
  US10/376,499
• Publication Number:
  US 20040074281A1
• Time in Patent Office: 753 Days
• Field of Search: 731/57, 737/01, 737/18, 737/45, 600/488, 604/122
• US Class Current: 73/157
• CPC Class Codes: A61M 1/73 comprising sensors or indicators for physical values
• CPC Class Codes: A61M 1/74 Suction control underwater drainage A61M1/61
• CPC Class Codes: A61M 2205/3331 Pressure; Flow
• CPC Class Codes: A61M 2205/3351 Controlling upstream pump pressure
• CPC Class Codes: A61M 2205/50 with microprocessors or computers
• CPC Class Codes: A61M 2205/70 with testing or calibration facilities
• CPC Class Codes: G01L 27/007 Malfunction diagnosis, i.e. diagnosing a sensor defect

Abstract

A method of determining the accuracy of a pressure sensor in a surgical cassette is disclosed. The method involves displacing a diaphragm of the sensor a pre-defined amount of displacement, and measuring the force exerted on the diaphragm by the displacing step. The accuracy of the pressure sensor is determined by comparing the force measured in the measuring step to a pre-defined force for the pre-defined amount of displacement.

Claims

1. A method of determining the accuracy of a pressure sensor in a surgical cassette, comprising the steps of:

providing a surgical cassette having a pressure sensor, said pressure sensor having a diaphragm;

providing a surgical console with a cassette receiving area;

disposing said cassette in said cassette receiving area;

displacing said diaphragm a pre-defined amount of displacement;

measuring a force exerted on said diaphragm by said displacing step; and

determining an accuracy of said pressure sensor by comparing said force measured in said measuring step to a pre-defined force for said pre-defined amount of displacement.

2. The method of claim 1 further comprising the step of providing information to a user of said surgical console when said force measured in said measuring step is not within a pre-defined tolerance of said pre-defined force.

3. The method of claim 1 further comprising the step of preventing a surgical procedure when said force measured in said measuring step is not within a predefined tolerance of said pre-defined force.

4. The method of claim 1 wherein:

said surgical console comprises a linear actuator having a plunger and a load cell operatively coupled to said plunger,

said displacing step comprises displacing said diaphragm with said plunger of said linear actuator; and

said measuring step comprises measuring said force exerted on said diaphragm by said plunger with said load cell.

5. The method of claim 4 wherein said cassette has an aspiration manifold, and said diaphragm is in fluid communication with said aspiration manifold.