EP0110560A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Ophthalmic instrument for measuring intraocular fluid pressure
Assignee: Astra Meditec AB
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Filing: 1983-10-27
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Granted: —
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Expires: 2003-10-27
Abstract
Abstract An ophthalmic instrument for measuring relative pressure of fluid inside an ocular globe, comprising an elongated surgical instrument (61) adapted to penetrate the ocular globe; pressure sensitive means (67, 68) mounted on the instrument for moving in response to relative pressure changes in intraocular fluid; transducer means (65) communicating with the pressure sensitive means for generating a signal in response to movement of the pressure sensitive means; and means for transmitting the signal external of the instrument.
Inventors
- 👤 Constantine Demosthenes Armeniades
- 👤 Louise Cope Moorhead
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 08:56
CPC Classifications
A; A61; A61F; A61F9/00; A61F9/007; A61F9/00736; A61B; A61B3/00; A61B3/10; A61B3/16; A61B5/00; A61B5/03
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
77 words
An ophthalmic instrument for measuring relative pressure of fluid inside an ocular globe, comprising: (a) an elongated surgical instrument adapted to penetrate the ocular globe; (b) pressure sensitive means mounted on the instrument for moving in response to relative pressure changes in intraocular fluid; (c) transducer means communicating with the pressure sensitive means for generating a signal in response to movement of the pressure sensitive means; and (d) means for transmitting the signal external of the instrument.
Claim 2
Dependent Claim
77 words
An ophthalmic instrument for measuring relative pressure of fluid inside an ocular globe, comprising: (a) an elongated surgical instrument adapted to penetrate the ocular globe; (b) pressure sensitive means mounted on the instrument for moving in response to relative pressure changes in intraocular fluid; (c) transducer means communicating with the pressure sensitive means for generating a signal in response to movement of the pressure sensitive means; and (d) means for transmitting the signal external of the instrument.
Claim 3
Dependent Claim
38 words
The instrument of claim 1, wherein the instrument further includes a conduit with an opening for communicating with the intraocular fluid and adapted for connection to means for removing fluid from or introducing fluid into the ocular globe.
Claim 4
Dependent Claim
48 words
The instrument of claim 2, wherein the pressure sensitive means includes a flexible diaphragm, and the signal means includes a pressure transducer in physical contact with the diaphragm for generating an electrical signal in response to movement of the diaphragm caused by pressure differences in the intraocular fluid.
Claim 5
Dependent Claim
51 words
The instrument of claim 3, wherein the diaphragm is located on the outer surface of the instrument and the instrument includes a second conduit in which the transducer is mounted, the second conduit communicating with the atmosphere so that the transducer can determine intraocular fluid pressure changes relative to atmospheric pressure.
Claim 6
Dependent Claim
39 words
The instrument of claim 4, wherein the portion of the second conduit in which the transducer is located is formed in the outer end of the instrument and the chamber extends along the instrument parallel to the first conduit.
Claim 7
Dependent Claim
101 words
The instrument of claim 3, wherein the instrument further includes a second conduit communicating with the interior of the ocular globe and adapted for connection to a suction means, cutting means associated with the second conduit for performing surgical operations within the ocular globe, and a chamber having at least a portion located between the intraocular fluid and second conduit and being separated from the fluid and second conduit by first and second diaphragms respectively, the pressure transducer contacting both diaphragms for generating a signal in response to relative pressure changes between fluid in the ocular globe and the second conduit.
Claim 8
Dependent Claim
26 words
The instrument of claim 6, wherein the first and second diaphragms are parallel and the first diaphragm is located on the outer end of the instrument.
Claim 9
Dependent Claim
31 words
The instrument of claim 6, wherein the first and second conduits are concentric, the first conduit terminating short of the portion of the second conduit that communicates with the intraocular fluid.
Claim 10
Dependent Claim
118 words
An elongated ophthalmic instrument adapted for performing aspiration and irrigation surgical procedures within the ocular globe and capable of measuring relative pressure of intraocular fluid, comprising: (a) a conduit adapted for connection to means for introducing or removing fluid from the ocular globe; (b) a chamber out of communication with the conduit and located adjacent the outer surface of the instrument; (c) pressure sensitive means separating the chamber from the intraocular fluid for moving in response to relative pressure changes in the fluid; (d) transducer means in the chamber communicating with the pressure sensitive means for generating a signal in response to movement of the pressure sensitive means; (e) means for transmitting the signal external of the instrument.
Claim 11
Dependent Claim
118 words
An elongated ophthalmic instrument adapted for performing aspiration and irrigation surgical procedures within the ocular globe and capable of measuring relative pressure of intraocular fluid, comprising: (a) a conduit adapted for connection to means for introducing or removing fluid from the ocular globe; (b) a chamber out of communication with the conduit and located adjacent the outer surface of the instrument; (c) pressure sensitive means separating the chamber from the intraocular fluid for moving in response to relative pressure changes in the fluid; (d) transducer means in the chamber communicating with the pressure sensitive means for generating a signal in response to movement of the pressure sensitive means; (e) means for transmitting the signal external of the instrument.
Claim 12
Dependent Claim
41 words
The instrument of claim 9, wherein the portion of the chamber housing in which the transducer is positioned in the outer end of the instrument and the chamber extends parallel to the conduit along the instrument and communicates with the atmosphere.
Claim 13
Dependent Claim
14 words
The instrument of claim 9, wherein the pressure sensitive means includes a flexible diaphragm.
Claim 14
Dependent Claim
26 words
The instrument of claim 9, wherein the transducer means includes a cantilevered piezo-resistive element mounted in the chamber in physical contact with the pressure sensitive means.
Claim 15
Dependent Claim
127 words
An elongated ophthalmic surgical instrument adapted for removing tissue from the ocular globe by suction and capable of measuring differences in suction force, comprising: (a) a conduit adapted for connection to suction means communicating with the interior of the ocular globe through which tissue can be removed; (b) cutting means associated with the first conduit for cutting portions of tissue to be removed; (c) a chamber located adjacent to the conduit; (d) pressure sensitive means separating the chamber from the conduit for moving in response to relative pressure changes in the fluid; (e) transducer means in the chamber communicating with the pressure sensitive means for generating a signal in response to movement of the pressure sensitive means; (f) means for transmitting the signal external of the instrument.
Claim 16
Dependent Claim
127 words
An elongated ophthalmic surgical instrument adapted for removing tissue from the ocular globe by suction and capable of measuring differences in suction force, comprising: (a) a conduit adapted for connection to suction means communicating with the interior of the ocular globe through which tissue can be removed; (b) cutting means associated with the first conduit for cutting portions of tissue to be removed; (c) a chamber located adjacent to the conduit; (d) pressure sensitive means separating the chamber from the conduit for moving in response to relative pressure changes in the fluid; (e) transducer means in the chamber communicating with the pressure sensitive means for generating a signal in response to movement of the pressure sensitive means; (f) means for transmitting the signal external of the instrument.
Claim 17
Dependent Claim
36 words
The instrument of claim 13, wherein the chamber is located in the outer end of the instrument between its tip and the conduit and includes a second pressure sensitive means separating the chamber and intraocular fluid.
Claim 18
Dependent Claim
17 words
The instrument of claim 14, wherein the first and second pressure sensitive means include parallel flexible diaphragms.
Claim 19
Dependent Claim
21 words
The instrument of claim 15, wherein the transducer includes a cantilevered, piezo-resistive element mounted between and in contact with both diaphragms.
Claim 20
Dependent Claim
36 words
The instrument of claim 13, and further including a second conduit concentric with the first conduit communicating with the interior of the ocular globe adapted for connection with means for introducing fluid into the ocular globe.
References Cited (Backward Citations)
No citation records indexed.
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