Electronic catheter displacement sensor

Details Electronic catheter displacement sensor Electronic catheter displacement sensor

1994-12-22

1998-01-20

Rimell, Sam

Surgery

Means for introducing or removing material from body for...

Treating material introduced into or removed from body...

604174, 33512, A61M 500

Patent

active

057096619

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
The present invention relates to an electronic catheter displacement sensor which senses the advancement of a catheter as the catheter is pushed or pulled through the sensor. The sensor generates signals which are supplied to electronic processing circuitry that converts the signals to signals indicative of a unit of distance and indicative of direction of movement of the catheter and these distance signals can then be supplied to a visual display device such as a video screen. The distance which the catheter has been advanced, such as during advancement of the catheter into a blood vessel in a body, then can be displayed on the video screen.
The invention is also directed to a disposable sensor unit of the displacement sensor through which the catheter is advanced and/or retracted so that each time the displacement sensor is used with a new catheter, a new sterile sensor unit can be mounted in the displacement sensor thereby to prevent contamination of the new catheter.
2. Description of Prior Art
Heretofore various devices have been proposed for advancing catheters into body cavities or blood vessels. Examples of such prior art devices are disclosed in the following patent publications:


______________________________________ U.S. Pat. No. Patentee ______________________________________ 3,835,854 Jewett 4,401,433 Luther 4,563,176 Gustavsson et al. 4,616,648 Simpson 4,846,171 Kauphusman et al. 4,917,094 Lynch et al Published European Patent Specification Gustavvson et al. No. 0 050 606 ______________________________________
The Jewett U.S. Pat. No. 3,835,854 discloses a device for advancing a catheter between two nip rollers, one being an idler roller and one being a drive roller. A knob is connected to the drive roller whereby rotation of the knob will advance the catheter into a needle upon rotation of the knob. The Luther U.S. Pat. No. 4,401,433 discloses an apparatus for advancing an oversized catheter through a cannula by folding the catheter and then passing the folded catheter through advancing roller drives which are rotated to advance the catheter through a cannula and thence into a patient.
The Gustavvsson et al. U.S. Pat. No. 4,563,176 discloses a device for sterile storage of a catheter and the sterile advancing thereof. A ratchet mechanism or a movable handle are provided for advancing the catheter. The catheter is received through a sterile transparent plastic sheath having a movable scale thereon, the zero point of the scale being aligned with a coupling piece at the proximal end of the catheter. As the catheter is advanced out of the protective sheath, the position of the coupling piece relative to the scale indicates how far into the body the catheter has been advanced.
The Simpson U.S. Pat. No. 4,616,648 discloses a device for facilitating the exchange of dilatation catheters during an angioplasty procedure. The device includes first and second friction rollers and a rotatable member for causing rotation of friction rollers to move an exchange guidewire into tubing mounted within a housing coupled to a guiding catheter for inserting an exchange guidewire into the guiding catheter.
The Kauphusman et al. U.S. Pat. No. 4,846,171 discloses a laser catheter adjustable control apparatus including an optic fiber advance housing having a fiber advance assembly mounted therein for reciprocal movement. The advancing mechanism has ratchet teeth such that the ratchet teeth on a movable part will engage the optic fiber for moving same when the movable part is depressed and moved longitudinally by a physician.
The Lynch et al U.S. Pat. No. 4,917,094 discloses a guidewire advancement system including a housing through which a guidewire extends, an opening in the housing and a slide bar mounted in the opening. The slide bar can be depressed against the guidewire and then moved axially with the guidewire toward a patient to move the guidewire incrementally into an artery of the patient. A monitor can be electrically connected

REFERENCES:
patent: 4644157 (1987-02-01), Ozawa
patent: 5297346 (1994-03-01), Weiner

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