Fluid level detection system

• US 8,876,757 B2
• Filed: 11/12/2009
• Issued: 11/04/2014
• Est. Priority Date: 11/12/2009
• Status: Active Grant

• Current Assignee: Johnson & Johnson Surgical Vision, Inc. (Johnson & Johnson)
• Original Assignee: Abbott Medical Optics Incorporated (Johnson & Johnson)
• Inventors: Jacobson, Jon D., Lynn, Kyle
• Primary Examiner(s): Vu, Quynh-Nhu H
• Assistant Examiner(s): Zhang, Jenna
• Application Number:
  US12/617,472
• Publication Number:
  US 20110112472A1
• Time in Patent Office: 1,818 Days
• Field of Search: 604 65- 67, 340/619, 250/577, 732/93
• US Class Current: 604/67
• 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
• CPC Class Codes: A61M 2205/3306 Optical measuring means
• CPC Class Codes: A61M 2205/3379 Masses, volumes, levels of fluids in reservoirs, flow rates
• CPC Class Codes: A61M 2205/3389 Continuous level detection A61M2205/3393 takes precedence
• CPC Class Codes: A61M 37/0092 using ultrasonic, sonic or infrasonic vibrations, e.g. phonophoresis
• CPC Class Codes: A61M 5/16804 Flow controllers
• CPC Class Codes: A61M 5/172 electrical or electronic A61M5/16804, A61M5/16831 take precedence
• CPC Class Codes: G01F 23/292 Light , e.g. infrared or ultraviolet
• CPC Class Codes: G16H 20/17 delivered via infusion or injection
• CPC Class Codes: Y02A 90/10 Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation

Abstract

A medical device fluid sensing system is provided. The system includes a transmitter array positioned in association with a fluid maintaining device, such as a reservoir in a cassette. Electrical circuitry is connected to the transmitter array and configured to cause the transmitter array to transmit light energy at a predetermined wavelength and producing a desired absorption coefficient based on expected conditions within the fluid maintaining device. The system also includes a receiver array configured to receive light energy transmitted through the fluid maintaining device and originating from the transmitter array, and a controller configured to determine fluid level in the fluid maintaining device based on conditions sensed by the receiver array. In one embodiment, three transmitters and three matching sensors are provided in a surgical cassette, and when optical energy having predetermined characteristics is provided to the transmitter array, the presence or absence of fluid is determined.

Claims

1. A medical device, comprising:

a plurality of transmitters and a numerically matching plurality of receivers forming transmitter-receiver pairs positioned in association with a fluid maintaining device associated with the medical device;

circuitry configured to drive the transmitter to transmit light energy to said fluid maintaining device; and

a controller configured to receive data from the receiver and determine fluid level in said fluid maintaining device;

wherein each transmitter of the plurality of transmitters is configured to transmit light energy at a predetermined wavelength forming a signal distinct from the other of the plurality of transmitters, each receiver of the plurality of receivers continuously receives light energy from the paired transmitter when the paired transmitter transmits light energy, and the controller is further configured to determine presence and absence of fluid in said fluid maintaining device based on an amount of light energy received at each receiver of the plurality of receivers;

wherein the amount of light energy received at each receiver of the plurality of receivers is based on the predetermined wavelength of the light energy, a distance between the transmitter and the receiver of the transmitter-receiver pair, and an absorption coefficient for fluid expected to be employed in the fluid maintaining device, such that light energy below a predetermined nonzero value received at a receiver of the plurality of receivers indicates fluid presence at the receiver level in the fluid maintaining device and light energy above the predetermined nonzero value received at a receiver of the plurality of receivers indicates an absence of fluid at the receiver level in the fluid maintaining device.

2. The medical device of claim 1, wherein each receiver of the plurality of receivers is at a substantially same height as the paired transmitter and receives light energy when transmitted in the presence of fluid and in the absence of fluid.

3. The medical device of claim 2, wherein the presence of an excess amount of fluid in the fluid maintaining device determined by the controller causes the controller to provide an indication to expel fluid from the fluid maintaining device.

4. The medical device of claim 1, wherein the receiver of each of the plurality of transmitter-receiver pairs is configured to receive light energy transmitted through the fluid maintaining device originating from said paired transmitter.

5. The medical device of claim 1, wherein fluid may be added to the fluid maintaining device based on an amount of fluid present in the fluid maintaining device as determined by the controller.

6. The medical device of claim 1, wherein the transmitter and receiver of a transmitter-receiver pair are positioned external to the fluid maintaining device.

7. The medical device of claim 1, wherein the transmitter and receiver of a transmitter-receiver pair are positioned within the fluid maintaining device.

8. The medical device of claim 1, wherein the transmitter and receiver of a transmitter-receiver pair are positioned vertically with respect to the fluid maintaining device.

9. The medical device of claim 1, wherein the predetermined wavelength is between approximately 950 nm and 1550 nm.

10. The medical device of claim 1, wherein each transmitter of the plurality of transmitters comprises a transmitter array and each receiver of the plurality of receivers comprises a receiver array.

11. A method of controlling a fluid level in a fluid maintaining device, comprising:

emitting light from one or more of a plurality of transmitters at a predetermined wavelength forming a signal distinct from the other of the plurality of transmitters positioned in association with the fluid maintaining device through said fluid maintaining device;

sensing the light from the fluid maintaining device continuously at one or more of a numerically matching plurality of receivers positioned in association with the fluid maintaining device, wherein said sensing comprises the one or more receivers continuously receiving light energy from the fluid maintaining device when the one or more transmitters is/are transmitting light energy; and

adjusting the fluid level in the fluid maintaining device based on sensed light and an absorption coefficient for the type of fluid expected to be employed in the fluid maintaining device;

wherein a quantity of light energy sensed by a receiver of the plurality of receivers below a nonzero threshold constitutes the presence of fluid at the level of that receiver, the nonzero threshold based on a wavelength of light transmitted, distance between the transmitter and receiver, type of fluid expected to be employed in the fluid maintaining device and the absorption coefficient, and further wherein the quantity of light energy sensed by each receiver in excess of the nonzero threshold constitutes an absence of fluid at the level of each receiver.

12. The method of claim 11, wherein adjusting the fluid level comprises activating a pump to increase or decrease the fluid level in the fluid maintaining device.

13. The method of claim 11, wherein the emitted light from each of the plurality of transmitters has a wavelength between approximately 950 nm and approximately 1550 nm.

14. The method of claim 11, wherein the fluid maintaining device is a component of an ophthalmic surgical device.

15. A medical device, comprising:

a transmitter array comprising a plurality of light energy transmitters positioned in association with a fluid maintaining device;

electrical circuitry connected to the transmitter array and configured to cause the transmitter array to transmit light energy at a predetermined wavelength forming a signal distinct from the other of the plurality of transmitters;

a receiver array comprising a numerically matching plurality of receivers, each of the plurality of receivers paired with one of the plurality of transmitters continuously receiving light energy transmitted through the fluid maintaining device and originating from the paired transmitter of the transmitter array when the transmitter array is transmitting light energy; and

a controller configured to determine fluid level in the fluid maintaining device based on conditions sensed by the receiver array such that conditions below a nonzero threshold constitute the presence of fluid in the fluid maintaining device at a level of the receiver array and conditions sensed by the receiver above the nonzero threshold constitute the absence of fluid in the fluid maintaining device at the level of the receiver array, the nonzero threshold based on the predetermined wavelength of the light energy, a distance between each transmitter-receiver pair of the transmitter array and the receiver array, and an absorption coefficient for fluid expected to be employed in the fluid maintaining device.

16. The medical device of claim 15, wherein the presence of an excess amount of fluid in the fluid maintaining device determined by the controller causes the controller to provide an indication to expel fluid from the fluid maintaining device.

17. The medical device of claim 15, wherein each of the plurality of light energy transmitters is placed at different desired locations in association with the fluid maintaining device and each of the plurality of sensors is positionally cooperating with the plurality of light energy transmitters.

18. The medical device of claim 15, wherein fluid may be added to the fluid maintaining device based on an amount of fluid present in the fluid maintaining device as determined by the controller.

19. The medical device of claim 15, wherein the receiver and transmitter arrays are positioned external to the fluid maintaining device.

20. The medical device of claim 15, wherein the receiver and transmitter arrays are positioned within the fluid maintaining device.

21. The medical device of claim 15, wherein the medical device is an ophthalmic surgical device.