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Aspiration control via flow or impedance

a flow or impedance technology, applied in the direction of suction pumps, intravenous devices, other medical devices, etc., can solve the problems of lack of occlusion detection, difficulty in operating vacuum controlled systems in flow controlled mode, and varying amounts of effort required to effectively and safely remove tissue and fluid

Inactive Publication Date: 2007-01-04
ALCON INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Varying surgical conditions and surgical objectives can lead to varying amounts of effort required to effectively and safely remove the tissue and fluid.
Disadvantages of such systems are the lack of flow information resulting in transient high flows during phacoemulsification or fragmentation coupled with a lack of occlusion detection.
Vacuum controlled systems are difficult to operate in a flow controlled mode because of the problems of non-invasively measuring flow in real time.
Disadvantages of such systems are relatively slow response times, undesired occlusion break responses when large compliant components are used, and vacuum can not be linearly decreased during tip occlusion.
Flow controlled systems are difficult to operate in a vacuum controlled mode because time delays in measuring vacuum can cause instability in the control loop, reducing dynamic performance.
The peristaltic pump does not provide aspiration vacuum to the surgical site.

Method used

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Examples

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Embodiment Construction

[0013] The preferred embodiment of the present invention and its advantages is best understood by referring to FIG. 1 of the drawings. Microsurgical system 10 includes a pressurized gas source 12, an isolation valve 14, a vacuum proportional valve 16, an optional second vacuum proportional valve 18, a pressure proportional valve 20, a vacuum generator 22, a pressure transducer 24, an aspiration chamber 26, a fluid level sensor 28, a pump 30, a collection bag 32, an aspiration port 34, a surgical device 36, a computer or microprocessor 38, and a proportional control device 40. The various components of system 10 are fluidly coupled via fluid lines 44, 46, 48, 50, 52, 54, 56, and 58. The various components of system 10 are electrically coupled via interfaces 60, 62, 64, 66, 68, 70, 72, 74, and 76. Valve 14 is preferably an “on / off” solenoid valve. Valves 16-20 are preferably proportional solenoid valves. Vacuum generator 22 may be any suitable device for generating vacuum but is prefe...

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Abstract

A microsurgical system capable of controlling aspiration and detecting an occlusion via monitoring a change in either suction flow rate or suction impedance.

Description

FIELD OF THE INVENTION [0001] The present invention generally pertains to controlling aspiration in microsurgical systems and more particularly to controlling aspiration in ophthalmic microsurgical systems. DESCRIPTION OF THE RELATED ART [0002] During small incision surgery, and particularly during ophthalmic surgery, small probes are inserted into the operative site to cut, remove, or otherwise manipulate tissue. During these surgical procedures, fluid is typically infused into the eye, and the infusion fluid and tissue are aspirated from the surgical site. Varying surgical conditions and surgical objectives can lead to varying amounts of effort required to effectively and safely remove the tissue and fluid. [0003] The types of aspiration systems used, prior to the present invention, were generally characterized as either flow controlled or vacuum controlled, depending upon the type of pump used in the system. Each type of system has certain advantages. [0004] Vacuum controlled asp...

Claims

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Application Information

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IPC IPC(8): A61M1/00
CPCA61M1/0031A61M1/0076A61M1/0035A61M2205/3379A61M1/0027A61M2205/123A61M1/732A61M1/74A61M1/743A61M1/804A61M1/72
Inventor HOPKINS, MARK A.HUCULAK, JOHN C.TODD, KIRK W.THOMAS, ROGERGAO, SHAWN X.NAZARIFAR, NADER
Owner ALCON INC
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