Fluid-carrying components of apparatus for automatic control of intraocular pressure

• US 4,841,984 A
• Filed: 10/16/1987
• Issued: 06/27/1989
• Est. Priority Date: 09/16/1985
• Status: Expired due to Fees

• Current Assignee: Armoor Opthalmics Incorporated
• Original Assignee: Armoor Opthalmics Incorporated
• Inventors: Armeniades, C. D., Moorhead, Louise C.
• Primary Examiner(s): Hindenburg, Max
• Assistant Examiner(s): Lacyk, John P.
• Application Number:
  US07/109,077
• Time in Patent Office: 620 Days
• Field of Search: 128/645, 128/673, 128/675, 128/676, 128/748 E, 604/66, 73/721, 73/66, 73/727
• US Class Current: 600/561
• CPC Class Codes: A61B 2090/032 pressure limiting, e.g. hydrostatic
• CPC Class Codes: A61B 3/16 for measuring intraocular pressure, e.g. tonometers
• CPC Class Codes: A61B 5/02216 Ophthalmodynamometers
• CPC Class Codes: A61F 9/00736 Instruments for removal of intra-ocular material or intra-ocular injection, e.g. cataract instruments A61F9/008 takes precedence

Abstract

An ophthalic device and system for measuring and controlling relative fluid pressure inside an ocular globe includes a surgical instrument which is adapted to penetrate the ocular globe. A fluid pressure transducer is mounted on the instrument so that when the instrument penetrates the ocular globe the transducer is located adjacent to an opening that communicates with the interior of the globe so that it can react to pressure changes in the fluid therein and generate signals in response to changes in the pressure of the fluid. The signal is transmitted external of the instrument to a control system which is operatively connected to the transducer for first receiving signals from the transducer and the controlling a fluid supply system in response to signals according to a predetermned set of instructions. The control system is connected to a closed loop feed system in which fluid is continuously circulated. Fluctuations in intraocular pressure cause the control system to divert fluid from the feed system to the ocular globe to a conduit connected to the closed loop.

Claims

1. An apparatus for controlling fluid pressure in an ocular globe, comprising:

(a) a transfer conduit means adapted to communicate with the interior of the ocular globe; and

(b) damping means communicating with the transfer conduit means for attenuating transient and rapid periodic disturbances in intraocular pressure.

2. The apparatus of claim 1 further comprising:

a fluid reservoir communicating with the transfer conduit for supplying fluid to the ocular globe; and

means for supplying fluid through the transfer conduit means to the ocular globe.

3. The apparatus of claim 1, wherein the damping means include a damping chamber and a relief tube with one end in the damping chamber and the other end connected to the transfer conduit, said one end being adapted to be positioned above a quantity of fluid in the chamber for attenuating sudden changes in intraocular pressure.

4. The apparatus of claim 3, wherein the damping chamber is a thin-walled air chamber constructed of a rigid material.

5. The apparatus of claim 3, wherein the damping means includes a hollow enclosed handle for holding the transfer conduit means and comprising the damping chamber.

6. The apparatus of claim 5, wherein an aspiration line is also held by the handle.

7. The apparatus of claim 1, wherein the damping means includes a resilient walled chamber.

8. The apparatus of claim 7, wherein the damping means is adapted to include a quantity of fluid in a portion away from where the damping means is connected to the transfer conduit.

9. The apparatus of claim 1, and further including a fluid infusion conduit, said damping means being mounted in parallel to said fluid infusion conduit.

10. The apparatus of claim 2 wherein said means for supplying being a gravity flow while said fluid reservoir is elevated above the ocular globe

12. The apparatus of claim 1, wherein the pressure sensing means includes a surgical instrument adapted to penetrate the ocular globe, and a pressure transducer mounted on the instrument in communication with the intraocular fluid.

13. The apparatus of claim 1, wherein the damping means includes a damping chamber and a relief tube with one end in the damping chamber and the other end connected to the transfer conduit, said one end being adapted to be positioned above a quantity of fluid in the chamber for attenuating sudden changes in intraocular pressure.

14. The apparatus of claim 13, wherein the damping chamber is a thin-walled air chamber constructed a rigid material.

15. The apparatus of claim 13, wherein the damping means includes a hollow enclosed handle for holding the transfer conduit means and comprising the damping chamber.

16. The apparatus of claim 15, wherein an aspiration line is also held by the handle.

17. The apparatus of claim 1, wherein the damping means includes a resilient walled chamber.

18. The apparatus of claim 17, wherein the damping means is adapted to include a quantity of gas in a portion away from where the damping means is connected to the transfer conduit.

11. An apparatus for controlling fluid pressure in an ocular globe, comprising:

(a) a transfer conduit means adapted to communicate with the interior of the ocular globe;

(b) a fluid reservoir communicating with the transfer conduit for supplying fluid to the ocular globe;

(c) pump means for supplying fluid through the transfer conduit means to the ocular globe;

(d) pressure sensing means adapted to communicate with fluid in the ocular globe for generating signals in response to changes in intraocular pressure;

(e) control means for receiving signals from the pressure sensing means and vary the amount of fluid transferred through the transfer conduit means in response to flucuations in intraocular pressure; and

(f) damping means communicating with the transfer conduit means for attenuating transient and rapid periodic disturbances in intraocular pressure.