# US 2006/0052850 A1 · Hybrid cannula/electrode medical device and method

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- Number: US 2006/0052850 A1
- Document ID: US20060052850A1
- Status: Published application
- Kind: A1
- Application number: 10/933,245
- Filed: 2004-09-03
- Published: 2006-03-09
- Earliest claimed: 2004-09-03
- Assignees: Diros Technology Inc.
- Inventors: George Darmos; Ilya Gavrilov; Peter Darmos
- Web page: https://patentgrep.com/patent/US20060052850A1

## CPC

- A61B 17/3421: {Cannulas}
- A61B 18/1477: {Needle-like probes}
- A61B 2018/00791: {Temperature}
- A61B 2018/00821: {measured by a thermocouple}
- A61B 2018/1425: {Needle}
- A61B 2218/002: Irrigation
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)

## Abstract

A cannula having a hollow metal tube for injection of liquids such as an anesthetic, or RF energy, into a patient. A thermocouple or other temperature sensor is located at the bare tip of the cannula, and a wire for the temperature sensor extends along the length of the cannula, preferably in a groove formed in the tube, or through a passageway formed in the tube. An outer insulation layer covers the tube and wire. Thus, a single device serves as both a cannula and an electrode.

## Claims

### Claim 1

A cannula comprising:
a) a hollow metal tube having a base end and a free tip, and an internal passage extending from the base end to the tip,
b) an insulation layer covering a majority of the length of said tube but not covering said tip and thereby leaving said tip exposed,
c) a temperature sensor wire extending along said tube from said base to a position adjacent said tip, said wire being insulated from said tube along the length of said tube but being electrically connected to a temperature sensor adjacent said tip, said temperature sensor also being connected to said tube so that said tube and said wire form two conductors of a circuit for said temperature sensor,
d) said wire being within said insulation layer, so that said cannula can be inserted into a patient and a liquid can be injected through said passage into said patient, and so that RF energy can be applied through said cannula while the temperature adjacent said tip is sensed by said temperature sensor.

### Claim 2 (depends on 1)

A cannula according to claim 1 wherein said temperature sensor is a thermocouple junction.

### Claim 3 (depends on 1)

A cannula according to claim 1 wherein said tube has an outer surface having a crease therein extending longitudinally along said tube, said wire being located in said crease, and said crease and said wire being covered by said insulation layer.

### Claim 4 (depends on 1)

A cannula according to claim 1 wherein said tube is D-shaped in cross-section, having a flat surface extending longitudinally along said tube, said insulation layer covering said flat surface and defining with said flat surface a space therebetween, said wire being located in said space.

### Claim 5 (depends on 1)

A cannula according to claim 1 wherein said tube has two D-shaped passages, said wire extending through one of said passages.

### Claim 6 (depends on 1)

A cannula according to claim 1 wherein said tube has an outer periphery, said outer periphery being circular in cross-section except for a flat portion extending longitudinally along the length of said tube, said insulation layer defining with said flat surface a space therebetween, said wire being located within said space.

### Claim 7 (depends on 1)

A cannula according to claim 1 wherein said tube has a groove formed therein, said groove extending longitudinally along said tube, said wire being located within said groove, said tube, groove and wire being covered by said insulation layer.

### Claim 8 (depends on 1)

A cannula according to claim 1 wherein said tube is of circular cross-section and has an outer surface, said wire extending longitudinally along said outer surface and said outer surface and said wire being covered by said insulation layer.

### Claim 9

A method of using a cannula, said cannula comprising a hollow metal tube having a base end and a free tip and an internal passage extending from the base end to the tip, an insulation layer covering a majority of the length of said tube but leaving said tip exposed, and a temperature sensor wire extending along said tube from said base to a position adjacent said tip, said wire being insulated from said tube along the length of said tube but being electrically connected to a temperature sensor adjacent said tip, said wire being within said insulation layer, said method comprising inserting said cannula into a patient to place said tip at a desired location within said patient, injecting a liquid such as an anesthetic through said cannula to anesthetize tissue at said location, applying energy through said cannula to said location, and measuring the temperature at said location using said temperature sensor.