SAMPLE INTRODUCTION DEVICES AND SYSTEMS AND METHODS OF USING AND PRODUCING THEM
Magnetic couplers and sample introduction devices including them are described. In certain configurations, a sample introduction device can include a magnetic coupler that can be used to hold down a sampling device to permit introduction of an analyte sample from the sampling device to an instrument or another component. Systems including the magnetic couplers, and methods and devices to produce them are also described.
1 . A sample introduction device comprising:
an aperture for receiving a sampling device; and
a first magnetic coupler comprising a first housing that comprises a first surface and a second surface opposite the first surface, wherein the first magnetic coupler comprises a plurality of arranged, individual permanent magnets in the first housing, wherein the first magnetic coupler is configured to magnetically couple to the sampling device at the first surface using a first magnetic field at the first surface, and wherein a magnitude of a second magnetic field at the second surface of the first magnetic coupler is less than a magnitude of the first magnetic field.
2 . The sample introduction device of claim 1 , further comprising a magnetic sensor configured to determine when the sampling device is coupled to the sample introduction device.
3 . The sample introduction device of claim 2 , wherein the magnetic sensor is configured to determine when a needle trap is inserted into an injector.
4 . The sample introduction device of claim 2 , wherein the magnetic sensor is configured to determine when a solid-phase microextraction fiber is inserted into an injector.
5 . The sample introduction device of claim 2 , wherein the magnetic sensor is configured to determine when a microextraction coil is inserted into an injector.
6 . The sample introduction device of claim 1 , wherein the first magnetic coupler comprises at least four arranged, individual permanent magnets with pole orientations of adjacent arranged, individual magnets being offset 90 degrees from each other.
7 . The sample introduction device of claim 1 , wherein the first magnetic coupler comprises at least six arranged, individual permanent magnets with pole orientations of adjacent arranged, individual magnets being offset 90 degrees from each other.
8 . The sample introduction device of claim 1 , further comprising a second magnetic coupler comprising a second housing comprising a third surface, a fourth surface, and a plurality of arranged, individual permanent magnets in the second housing.
9 . The sample introduction device of claim 8 , wherein the aperture is located between the first magnetic coupler and the second magnetic coupler.
10 . The sample introduction device of claim 2 , wherein the magnetic sensor comprises a Hall effect sensor, and wherein the first housing is configured as a square metal tube.
11 . The sample introduction device of claim 1 , wherein the first magnetic coupler comprises a Halbach array.
12 . The sample introduction device of claim 1 , wherein the first housing comprises a non-ferrous material.
13 . A method comprising inserting a sampling device into an aperture of an instrument to provide a sample from the sampling device to the instrument, wherein the instrument is configured to use an adjacent field to analyze the sample, wherein the sampling device is present in a sample introduction device comprising a first magnetic coupler comprising a first housing that comprises a first surface and a second surface opposite the first surface, wherein the first magnetic coupler comprises a plurality of arranged, individual permanent magnets in the first housing, wherein the first magnetic coupler is configured to magnetically couple to the sampling device at the first surface using a first magnetic field at the first surface, and wherein a magnitude of a second magnetic field at the second surface of the first magnetic coupler is less than a magnitude of the first magnetic field.
14 . The method of claim 13 , further comprising detecting a presence of the sampling device using a magnetic sensor.
15 . (canceled)
16 . The method of claim 13 , wherein the first magnetic coupler holds the sampling device to the aperture without application of any external mechanical force.
17 . The method of claim 13 , wherein the first magnetic coupler holds the sampling device to the aperture without the use of any external fasteners.
18 . The method of claim 13 , further comprising detecting the presence of the sampling device without using any magnetic shielding materials between the first magnetic coupler and the adjacent field.
19 . The method of claim 14 , further comprising configuring the magnetic sensor as a Hall effect sensor.
20 - 43 . (canceled)
44 . A sample introduction device configured to fluidically couple a sampling device to an instrument, the sample introduction device comprising at least one Halbach array configured to hold the sampling device in place while a sample is introduced from the sampling device into the instrument, wherein the Halbach array comprises a plurality of arranged, individual permanent magnets in a housing.
45 . An instrument comprising:
the sample introduction device of claim 44 ; and
a sample analyzer comprising at least one magnetic field source configured to generate an analyzing magnetic field to analyze a sample provided from the sampling device to the instrument, wherein the at least one Halbach array is further configured to perturb the analyzing magnetic field by less than an amount that would alter analysis of the sample using the analyzing magnetic field.
46 - 68 . (canceled)