Application of a system parameter as a method and mechanism for controlling eye chamber stability

A method of operating a surgical handpiece, comprising:

• placing a handpiece in an operative relationship with an eye for a surgical procedure;
• supplying irrigation fluid from an irrigation fluid source to the eye;
• applying vacuum from an aspiration source to the handpiece in order to aspirate the irrigation fluid from the eye through the handpiece;
• selecting an upper value of a controlled system parameter and a lower value of the controlled system parameter;
• and
• controlling the controlled system parameter to be less than or equal to the upper value.
• sensing a value of an occlusion indicting parameter corresponding to an occlusion of the handpiece;
• based at least in part on the sensing of the occlusion indicting parameter, controlling the controlled system parameter to be less than or equal to the lower value.

A method of operating a surgical handpiece, comprising:

• placing a handpiece in an operative relationship with an eye for a surgical procedure;
• supplying irrigation fluid from an irrigation fluid source to the eye;
• applying vacuum from an aspiration source to the handpiece in order to aspirate the irrigation fluid from the eye through the handpiece;
• selecting an upper value of a controlled system parameter and a lower value of the controlled system parameter;
• controlling the controlled system parameter to be less than or equal to the upper value;
• sensing a value of an occlusion indicting parameter corresponding to an occlusion of the handpiece;
• and
• based at least in part on the sensing of the occlusion indicting parameter, controlling the controlled system parameter to be less than or equal to the lower value.

A method of operating a surgical handpiece, comprising:

• placing a handpiece in an operative relationship with an eye for a surgical procedure;
• supplying irrigation fluid from an irrigation fluid source to the eye;
• applying vacuum from an aspiration source to the handpiece in order to aspirate the irrigation fluid from the eye through the handpiece;
• selecting an upper value of a controlled system parameter and a lower value of the controlled system parameter;
• controlling the controlled system parameter to be greater than or equal to the lower value;
• sensing a value of an occlusion indicting parameter corresponding to an occlusion of the handpiece;
• and
• based at least in part on the sensing of the occlusion indicting parameter, controlling the controlled system parameter to be greater than or equal to upper value.

A controller for a phacoemulsification system, comprising:

• a handpiece configured to be placed in an operative relationship with an eye for a surgical procedure;
• an irrigation fluid configured to supply an irrigation fluid source to the eye;
• an aspiration source configured to apply a vacuum to the handpiece in order to aspirate the irrigation fluid from the eye through the handpiece;
• a controller configured to:
• control a controlled system parameter to be greater than or equal to the lower value or to be less than or equal to an upper value;
• sense a value of an occlusion indicating parameter corresponding to an occlusion of the handpiece;
• from the sensing of the value, determine a duration of occlusion;
• and
• control a controlled system parameter based at least in part on at least one of (1) the sensing of the occlusion indicting parameter and (2) the duration of occlusion.