Self-aligning probes and related devices

• US 9,983,107 B2
• Filed: 07/22/2013
• Issued: 05/29/2018
• Est. Priority Date: 07/25/2012
• Status: Active Grant

• Current Assignee: Regents of the University of California (University of California)
• Original Assignee: Regents of the University of California (University of California)
• Inventors: Hansma, Paul K., Randall, Connor, Bridges, Daniel
• Primary Examiner(s): Huls, Natalie
• Assistant Examiner(s): Young, Monica S
• Application Number:
  US14/392,010
• Publication Number:
  US 20150323436A1
• Time in Patent Office: 1,772 Days
• Field of Search: 73 1209
• CPC Class Codes: A61B 5/0053 by applying pressure, e.g. compression, indentation, palpation, grasping, gauging
• CPC Class Codes: A61B 5/4504 Bones A61B5/4547 takes precedence
• CPC Class Codes: G01N 3/04 Chucks
• CPC Class Codes: G01N 3/40 Investigating hardness or rebound hardness
• CPC Class Codes: G01N 3/42 by performing impressions under a steady load by indentors, e.g. sphere, pyramid G01N3/54 takes precedence

Abstract

The field of the invention generally relates to probes, related devices and methods for measuring material properties. In an embodiment, the present invention provides a test probe for use in a reference point indentation device. The test probe has an end proximal to a tip and an end distal to the tip. The distal end of the test probe has a self-centering mate comprising a countersink of about 90 degrees to about 100 degrees to a depth of between 0.010 in. and 0.035 in.

Claims

1. A self-aligning test probe integrated into a reference point indentation device, wherein the self-aligning test probe has an end proximal to a tip and an end distal to the tip, and wherein the distal end of the test probe has a self-centering mate comprising a countersink of about 90 degrees to about 100 degrees to a depth of between 0.010 in. and 0.035 in., and wherein the self-centering mate is connected to a magnetic chuck comprising an alignment ball, a ring magnet and an impact transfer shaft, and wherein the self-centering mate is included in the main body of the test probe, and wherein the main body of the test probe is connected to a probe stop, and wherein the probe stop is connected to a guide portion, and wherein the guide portion is connected to an extension shaft, and wherein the extension shaft is connected to a tapered shaft which is connected to the tip, and wherein the self-aligning test probe is inserted into a nose cone of the reference point indentation device through a luer lock connected to a guide designed to maintain lateral alignment of the self-aligning test probe.

2. The test probe according to claim 1, wherein the tip of the test probe is 90 degrees and conical, and wherein the tip has a point less than 0.004 in. in radius.

3. The test probe according to claim 2, wherein the test probe mates with the alignment ball such that there is contact along a circular profile with a center, and wherein the center is free from contact.

4. The test probe according to claim 3, wherein the tapered shaft has a taper from 1.25 to 3.75 degrees from normal.

5. The test probe according to claim 4, wherein the tapered shaft has a total length of 0.2 in. to 0.6 in., and wherein the extension shaft is not tapered, and wherein the extension shaft is between 0.1 in. and 0.5 in. in length.

6. A method of measuring a property of a material, wherein the method comprises the steps of:

a) obtaining measurements on the material using a reference point indentation device, wherein the device comprises a probe mating chuck system, and wherein the system comprises a self-aligning test probe and a magnetic chuck, wherein the self-aligning test probe has an end proximal to a tip and an end distal to the tip, and wherein the distal end of the self-aligning test probe has a self-centering mate comprising a countersink of about 90 degrees to about 100 degrees to a depth of between 0.010 in. and 0.035 in., and wherein the self-centering mate is connected to a magnetic chuck comprising an alignment ball, a ring magnet and an impact transfer shaft, and wherein the self-centering mate is included in the main body of the test probe, and wherein the main body of the test probe is connected to a probe stop, and wherein the probe stop is connected to a guide portion, and wherein the guide portion is connected to an extension shaft, and wherein the extension shaft is connected to a tapered shaft which is connected to the tip, and wherein the self-aligning test probe is inserted into a nose cone of the reference point indentation device through a luer lock connected to a guide designed to maintain lateral alignment of the self-aligning test probe

b) analyzing the data to provide a measurement of the material property.

7. The method according to claim 6, wherein the tip of the test probe is 90 degrees and conical, and wherein the tip has a point less than 0.004 in. in radius.

8. The method according to claim 7, wherein the test probe mates with the alignment ball such that there is contact along a circular profile with a center, and wherein the center is free from contact.

9. The method according to claim 8, wherein the tapered shaft has a taper from 1.25 to 3.75 degrees from normal.

10. The method according to claim 9, wherein and wherein the tapered shaft has a total length of 0.2 in. to 0.6 in., and wherein the extension shaft is not tapered, and wherein the extension shaft is between 0.1 in. and 0.5 in. in length.