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US 5,400,091 AGranted
Ophthalmic instrument
AssigneeTopcon Corporation
InventorYasuhiro Okazaki
Life of this patent
Estimating the term…
Abstract
An ophthalmic instrument provided with an eye fundus measuring portion 1 for finding a position of the eye fundus of a patient's eye includes a transducer 11 for outputting a heartbeat signal corresponding to the heartbeat of a patient, a vital signal generating circuit 13, a synchronizing circuit 14, and a timer 16 each for actuating the eye fundus measuring portion 1 synchronously with the heartbeat signal.
Claims9
An ophthalmic instrument comprising:
- a system for locating a position-of the fundus in a patient's eye;
- heartbeat detecting means for outputting a heartbeat signal synchronized to a heartbeat of the patient;
- and
- means responsive to the heartbeat signal for actuating said system synchronously with the heartbeat signal, such as to prevent fundus position locating errors caused by patient heartbeats.
1 more element
An ophthalmic instrument comprising:
- a system for locating a position of the fundus in a patient's eye;
- means for outputting a first signal in response to each heartbeat of the patient;
- initiating means for generating a second signal when operation of the system to locate the fundus position is desired;
- and
- synchronizing means responsive to the first and second signals for generating a third signal in timed relation with each first signal occurring subsequent in time to each generation of the second signal, each third signal initiating operation of the system.
2 more elements
An ophthalmic instrument comprising:
- a system for locating a position of the fundus of a patient's eye;
- detecting means for outputting a heartbeat signal synchronized to a heartbeat of the patient;
- means for generating a first signal while each heartbeat signal exceeds a threshold amplitude;
- an initiation switch for generating a second signal when operation of the system to locate the fundus position is desired;
- synchronizing means responsive to the first and second signals for generating a third signal having a duration terminated by a leading edge of one of the first signals occurring subsequent to the generation of the second signal;
- and
- means for generating a fourth signal in delayed time relation to a trailing edge of the third signal, the fourth signal initiating operation of the system.
4 more elements
Dependencies are inferred from the claim text.