Patent ID: 11865040
Assignee: BAUSCH + LOMB IRELAND LIMITED
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 0:
1. A vitrectomy system comprising:
a surgical cutting apparatus comprising:
a cutting assembly including an outer cutter and an inner cutter;
a housing coupled to the cutting assembly, the housing containing a drive chamber, a spring chamber, at least a first diaphragm, wherein the at least first diaphragm is adhered to the inner cutter and positioned between the drive chamber and the spring chamber;
a drive chamber valve coupled to the drive chamber to supply compressed air to the drive chamber;
a spring chamber valve coupled to the spring chamber to adjust air pressure within the spring chamber; and

a processor operatively coupled to the surgical cutting apparatus and configured to:
pulse the drive chamber valve based on a desired cut rate to translate the inner cutter at the desired cut rate; and
set and maintain the air pressure in the spring chamber based on the desired cut rate for up to a threshold cut rate and adjust the air pressure within the spring chamber based on the desired cut rate only when the desired cut rate is above the threshold cut rate to adjust the stiffness of the spring chamber.