US 2023/0404424 A1 · 3-AXIS MAGNETIC POSITION SYSTEM FOR MINIMALLY INVASIVE SURGICAL INSTRUMENT, SYSTEMS AND METHODS THEREOF

Abstract

A minimally invasive surgical instrument using 3-axis magnetic positioning, system and methods thereof. This invention describes two key ideas that enable the development of a magnetic position system based on integrated anisotropic magnetoresistive (AMR) magnetic field sensors. This achieves the resolution, power and area targets necessary to integrate 3 axes anisotropic magnetoresistance (AMR) sensors along with the Analog Front End integrated circuit (IC) in a 4 mm by 350 um integrated solution for catheter applications. The stringent area and power dissipation requirements are met by development through both system level solutions for higher field strengths and a minimally necessary Analog Front End (AFE) to meet the 1 mm rms resolution requirement in the power dissipation and area budget.

Claims12

Dependent claims

1-20. (canceled)

A method of operating a catheter, comprising:

providing a catheter comprising:
for each of a first axis, a second axis, and a third axis:
a bridge circuit comprising:
a magneto resistive half bridge comprising a first magneto resistance and a second magneto resistance in series between a voltage supply and ground;
a poly resistive half bridge comprising a first poly resistance and a second poly resistance in series between the voltage supply and the ground;
a single stage operational amplifier comprising a differential input, wherein a first part of the differential input is in electrical communication with a midpoint between the first magneto resistance and the second magneto resistance, and wherein a second part of the differential input is in electrical communication with a midpoint between the first poly resistance and the second poly resistance;
and
an amplifier output sense pin in electrical communication with an output of the amplifier;
inserting the catheter into a working volume of a set of magnetic field generators;
measuring a voltage of each amplifier output sense pin;
and
determining a position of the catheter in the working volume based the measured voltage.

9 more elements

Dependencies are inferred from the claim text.

Facts

Application

18/461,062Filed 5 Sep 2023

Priority

1 Jun 2017

Published

21 Dec 2023

Term ends

Not estimatedThe source records don’t support an estimate.

Classification12 codes

A61B 5/062
Determining position of a probe within the body employing means separate from the probe, e.g. sensing internal probe position employing…
A61B 5/6852
Mounted on an invasive device: catheters
G01R 33/0206
Measuring direction or magnitude of magnetic fields or magnetic flux: three-component magnetometers
G01R 33/093
Magnetoresistive devices: using multilayer structures, e.g. giant magnetoresistance sensors

3-axis magnetic position system for minimally invasive surgical instrument, systems and methods thereof

Life of this patent

3-axis magnetic position system for minimally invasive surgical instrument, systems and methods thereof

Life of this patent

Abstract

Claims12