Nuclear magnetic resonance sample tube insert

• US 4,365,199 A
• Filed: 04/06/1981
• Issued: 12/21/1982
• Est. Priority Date: 04/06/1981
• Status: Expired due to Fees

• Current Assignee: Baylor College of Medicine (Baylor College)
• Original Assignee: Baylor College of Medicine (Baylor College)
• Inventors: McNair, Douglas S.
• Primary Examiner(s): Tokar, Michael J.
• Application Number:
  US06/251,642
• Time in Patent Office: 624 Days
• Field of Search: 324/307, 324/318, 324/321
• US Class Current: 324/318
• CPC Class Codes: G01R 33/31 Temperature control thereof

Abstract

An insert for insertion into a circularly cross-sectioned sample tube for use in nuclear magnetic resonance spectrometry for reducing temperature variations in the sample and dispersing heat generated. The insert includes two spaced end plugs having arcuate sides to thermally mate with the interior of the sample tube. The end plugs include a venting passageway for allowing flow of fluids past the plugs when the insert is moved into and out of a sample in the tube. An elongate circular rod is positioned between and connected to the end plugs and positioned to be coaxially positioned in the sample tube. The rod has a cross-sectional area of less than the end plugs for providing an annular sample chamber when positioned in a sample tube. The end plugs and the rod are of beryllium oxide for conducting heat from and reducing temperature variations in the sample tube. The sample tube may also be of beryllium oxide. An attachment is connected to one of the plugs for inserting and removing the insert from a sample tube, and a guide is provided on the other of the plugs for guiding the insert into a tube. If desired, a heatsink grease may be positioned on the sides of the end plug for providing greater thermal transmission between the insert and the tube.

Claims

1. An insert for insertion into a circularly cross-sectioned sample tube for use in nuclear magnetic resonance spectrometry comprising,

two spaced end plugs, said plugs having arcuate sides to be positioned in a heat exchange relationship adjacent the inner surface of sample tube when inserted therein,

said end plugs having venting means for allowing the passage of fluids when the insert is moved into a sample tube having a sample,

an elongate circular rod positioned between and connected to said end plugs, and

said end plugs and rod being of beryllium oxide.

2. The apparatus of claim 1 including attachment means connected to the top plug for inserting and removing the insert from a sample tube.

3. The combination of claim 1 with a sample tube comprised of beryllium oxide.

4. The apparatus of claim 1 including a heatsink grease positioned on the sides of the end plugs for providing a thermal contact with the tube when inserted.

5. The apparatus of claim 1 wherein one of the plugs includes a guide surface on its end remote from the rod.

6. An insert for insertion into a circularly cross-sectioned sample tube for use in nuclear magnetic resonance spectrometry for reducing temperature variations in the sample and dispersing heat generated therein comprising,

two spaced end plugs, said plugs having arcuate sides to mate with the interior of the sample tube for providing thermal transmission when the insert is inserted into the tube,

said end plugs having a venting passage for allowing flow of fluids pass the plugs when the insert is moved into a sample in the tube,

an elongate circular rod positioned between and connected to said end plugs and positioned to be coaxially positioned in the sample tube, said rod having a cross-sectional area of less than the end plugs for providing an annular sample chamber when positioned in a sample tube, and

said end plugs and said rod being of beryllium oxide for conducting heat from and reducing temperature variations in the sample tube.

7. The apparatus of claim 6 including,

attachment means connected to one of the plugs for inserting and removing the insert from a sample tube, and

guide means on other of said plugs for guiding the insert into a tube.