Phacoemulsification machine with post-occlusion surge control system and related method

a technology of surge control and phacoemulsification machine, which is applied in the direction of machines/engines, flexible member pumps, and positive displacement liquid engines, etc., can solve the problems of increasing the probe temperature, reducing the flow rate, and adding resistance to the aspiration tube, so as to reduce the post-occlusion surge and reduce the effect of surg

Inactive Publication Date: 2006-04-13
HOLDEN PHACO
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  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0025] It would therefore be beneficial to have a phacoemulsification machine which has a relatively high predetermined maximum vacuum level so that lens fr

Problems solved by technology

Although increasing the resistance of the aspiration tube 41 or other components of the aspiration system of the machine 30 does reduce the amplitude of the post-occlusion surge, it has the disadvantage of prolonging the duration of the surge.
Adding resistance to the aspiration tube also has the significant disadvantage of reducing the flow rate, especially at vacuums below 150 mmHg.
Also, as the probe needle 33 is cooled by the flow of infusion fluid, adding r

Method used

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  • Phacoemulsification machine with post-occlusion surge control system and related method
  • Phacoemulsification machine with post-occlusion surge control system and related method
  • Phacoemulsification machine with post-occlusion surge control system and related method

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Embodiment Construction

[0064] The prior art phaco-machine 30 depicted in FIG. 1 can be modified to include a post-occlusion surge controller which includes a post-occlusion surge detector 60 which is depicted in FIG. 6, and a valve controller 61 which is depicted in FIG. 7.

[0065] The post-occlusion surge detector 60 includes a vacuum sensor input 62 for connecting the detector 60 to the output of the vacuum sensor 48 of the phaco-machine 30 so that the electrical signal which is output by the sensor 48 can be monitored and processed by the detector 60. The electrical signal which is output by the sensor 48 is a positive voltage which is proportional to the vacuum in the interconnected compliant components of the machine 30 which is sensed by the sensor 48. The output of the vacuum sensor 48 may, for example, be 10V / 500 mmHg vacuum.

[0066] The detector 60 may include, for example, an operational amplifier configured as a differentiation amplifier, or a microcontroller. The detector 60 is configured to dif...

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Abstract

A post-occlusion surge controller 90 for a phacoemulsification machine 30 is adapted to detect a post-occlusion surge in an aspiration conduit 41 of the machine 30, and to cause the conduit 41 to be vented in response to detecting the surge.

Description

FIELD OF THE INVENTION [0001] The present invention relates generally to phacoemulsification machines which are used in cataract eye surgery to remove cataract-affected eye lenses and, in particular, to phacoemulsification machines which are adapted to control post-occlusion surges which sometimes occur during cataract eye surgery when such machines are used. [0002] Although the invention will be described with reference to a particular type of phacoemulsification machine, it will be appreciated that this is by way of example only and that the invention may be used in connection with other types of phacoemulsification machines. BRIEF DISCUSSION OF THE PRIOR ART [0003] Phacoemulsification or phaco-machines are used in cataract eye surgery to remove cataract-affected eye lenses. FIG. 1 depicts a typical prior art peristaltic pump-based phaco-machine 30 which includes a hand-held probe 31 comprising a hollow infusion sleeve 32 surrounding a hollow phacoemulsification needle 33. Needle ...

Claims

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Application Information

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IPC IPC(8): F04B43/12
CPCF04B43/1253
Inventor HOLDEN, HUGO ROSS
Owner HOLDEN PHACO
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