# US 4,398,149 A · NMR Probe coil system

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- Number: US 4,398,149 A
- Document ID: US4398149A
- Status: Granted
- Kind: A
- Application number: 06/230,226
- Filed: 1981-02-02
- Granted: 1983-08-09
- Earliest claimed: 1981-02-02
- Assignees: Varian Associates, Inc.
- Inventors: Albert P. Zens
- Web page: https://patentgrep.com/patent/US4398149A

## CPC

- G01R 33/34069: {Saddle coils}
- G01R 33/34007: {Manufacture of RF coils, e.g. using printed circuit board technology; additional hardware for providing mechanical support to the RF coil assembly or to part thereof, e.g. a support for moving the coil assembly relative to the remainder of the MR system}
- G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12)

## Abstract

A saddle coil for operation in the probe of an NMR spectrometer is formed from coil portions of opposite helicities disposed on a flexible insulating material, the outer windings of said portions connected by a linking conductor disposed on said insulating medium, which medium is then deformed to form a cylindrical body.

## Claims

### Claim 1

An NMR spectrometer comprising polarizing means for aligning nuclear moments of a sample, means for exciting rf resonances in said sample, receiver means for detecting said resonances, probe means communicating with said receiver means for coupling said resonance signal from said sample to said receiver, said probe means comprising saddle coil means comprising a first spiral winding portion and a second spiral winding portion, said second spiral winding portion wound in opposite sense to said first winding portion, the outer ends of said winding portions connected by a linking conductor, said winding portions capable of dispositions spaced apart in a common plane, said connecting link constrained to said plane.

### Claim 2 (depends on 1)

The apparatus of claim 1 wherein the centers of said spiral portions are spaced apart by an amount .pi.R in a plane whereby said planar disposed winding portions may be formed as a cylinder of radius R.

### Claim 3 (depends on 2)

The apparatus of claim 2 wherein said coil portions comprise conductors disposed on a flexible insulating material.

### Claim 4 (depends on 2)

The apparatus of claim 2 wherein said coil portions comprise self-supporting conductive members.