Specimen containment module for orthopedic simulator

• US 7,654,150 B2
• Filed: 01/20/2006
• Issued: 02/02/2010
• Est. Priority Date: 01/20/2006
• Status: Expired due to Fees

• Current Assignee: MTS Systems Corporation (Illinois Tool Works Inc.)
• Original Assignee: MTS Systems Corporation (Illinois Tool Works Inc.)
• Inventors: Schulz, Bradley D., Fahrendorff, Harold F.
• Primary Examiner(s): Caputo; Lisa M
• Assistant Examiner(s): Kirkland, III; Freddie
• Application Number:
  US11/335,974
• Publication Number:
  US 20070172394A1
• Time in Patent Office: 1,474 Days
• Field of Search: 737/88, 738/04, 73856-860
• US Class Current: 73/856
• CPC Class Codes: A61F 2/4425 made of articulated components
• CPC Class Codes: A61F 2/468 Testing instruments for artificial joints for testing non-implantable prostheses A61F2/76
• CPC Class Codes: B01L 2200/025 Align devices or objects to ensure defined positions relative to each other
• CPC Class Codes: B01L 2200/04 Exchange or ejection of cartridges, containers or reservoirs
• CPC Class Codes: B01L 2300/185 using a liquid as fluid
• CPC Class Codes: B01L 3/508 rigid containers not provided for above
• CPC Class Codes: G01N 2203/0089 Biorheological properties
• CPC Class Codes: G01N 2203/0222 Temperature
• CPC Class Codes: G01N 3/22 by applying steady torsional forces G01N3/26, G01N3/28 take precedence

Abstract

An orthopedic simulator, such as a spinal implant wear test machine, is provided with a specimen containment module that may be removed from the machine as a unit. The releasable attachability of the specimen containment module permits remote specimen installation and reduces environmental contamination.

Claims

1. A module assembly connectable to first and second portions of a test apparatus comprising:

a holder assembly including a first specimen holder coupled to a base platform configured to hold a first portion of a test specimen and a second specimen holder configured to hold a second portion of the test specimen coupled to an upper platform wherein connection of the test specimen to the first specimen holder and the second specimen holder forms a module unit comprising the base platform and the upper platform coupled to the base platform via connection of the test specimen to the first and second specimen holders;

a specimen chamber disposed between the upper and base platforms of the module unit; and

at least one fastener element configured to releasably connect the module unit having the test specimen secured to the first and second specimen holders to at least one of the first or second portions of the test apparatus.

2. The module assembly of claim 1 and comprising an enclosure coupled to the base platform to form the specimen chamber.

3. The module assembly of claim 2 and further comprising a flexible enclosure portion between the enclosure and the upper platform to seal the specimen chamber.

4. The module assembly of claim 1 wherein the base platform and the upper platform each include at least one fastener opening to releasably connect the base platform and the upper platform to the first and second portions of the test apparatus to releasably connect the module unit to the test apparatus.

5. The module assembly of claim 1 wherein the specimen chamber is configured to hold a test fluid.

6. The module assembly of claim 5 further comprising a test fluid temperature control element.

7. The module assembly of claim 6, wherein the test fluid temperature control element includes a fluid circulation tube through which a temperature control fluid is circulated.

8. The module assembly of claim 5 wherein the base platform includes an inlet and an outlet to the specimen chamber and the test fluid is circulated into and out of the specimen chamber through the inlet and the outlet.

9. A module assembly connectable to a test apparatus comprising:

a holder assembly including a first specimen holder configured to hold a first portion of a test specimen and a second specimen holder configured to hold a second portion of the test specimen;

a base platform and a upper platform wherein the first specimen holder is coupled to the base platform and the second specimen holder is coupled to the upper platform;

a specimen chamber disposed between the upper and base platforms; and

at least one fastener element configured to releasably connect the module assembly to the test apparatus wherein the module assembly is slidably inserted between spaced first and second portions of the test apparatus and including at least one slot having a pin slideable in the at least one slot to align the module assembly for connection to the test apparatus.

10. The module assembly of claim 9 wherein the at least one slot is formed in at least one of the base platform or the upper platform.

11. The module assembly of claim 10 including at least one slot formed in the base platform and at least one slot formed in the upper platform and including at least one pin slideable in the at least one slot formed in the base platform and at least one pin slideable in the at least one slot formed in the upper platform.

12. A combination comprising:

a test apparatus configured to supply a test force or load to a test specimen and including a first portion and a second portion spaced from the first portion;

a module assembly including a first specimen holder coupled to a first platform and a second specimen holder coupled to a second platform and the first platform being connected to the second platform through connection of a test specimen to the first and second specimen holders to form a module unit and the module unit being removably insertable between the first and second portions of the test apparatus and connectable to at least one of the first or second portions of the test apparatus by at least one fastening element.

13. The combination of claim 12 wherein the module assembly includes a specimen chamber configured to contain the test specimen and hold test fluid.

14. The combination of claim 13 wherein the specimen chamber comprising an inlet and an outlet through which the test fluid is circulated into and out of the specimen chamber.

15. The test combination of claim 13 wherein the module assembly further includes a temperature control element that controls a temperature of the test fluid in the specimen chamber.

16. The combination of claim 15 wherein the temperature control element includes a fluid circulation tube through which a temperature control fluid is circulated.

17. The test combination of claim 12 wherein the test apparatus is a spinal implant wear test machine and the test specimen is a spinal implant.

18. The combination of claim 12 wherein the first platform and the second platform of the modular unit are connectable to the first and second portions of the test apparatus by a plurality of fastening elements.

19. The combination of claim 12 wherein each of the first platform and the second platform include at least one fastener opening and further comprising a first fastener insertable into the at least one fastener opening of the first platform and a second fastener insertable into the at least one fastener opening of the second platform to secure the first platform and the second platform to the first and second portions of the test apparatus.

20. The combination of claim 12 and comprising a first enclosure portion connected to the first platform and a second flexible enclosure portion between the first enclosure portion coupled to the first platform and the second platform to form a sealed specimen chamber for the test specimen.

21. The combination of claim 12 and comprising at least one pin slidable into at least one slot to align the module unit for connection to the at least one of the first or second portions of the test apparatus.

22. The combination of claim 21 wherein the at least one slot is formed on the first platform or the second platform.

23. The combination of claim 21 including a first pin slideable into a slot in the first platform and a second pin slideable into a slot of the second platform to align the module unit between the first and second portions of the test apparatus.

24. A method of testing a test specimen, comprising the steps of:

connecting a first test specimen portion to a first specimen holder and a second test specimen portion to a second specimen holder to form a modular unit;

inserting the modular unit including the first test specimen portion secured to the first specimen holder and the second test specimen portion secured to the second specimen holder between opposed first and second portions of a test apparatus;

connecting the modular unit to the test apparatus after connecting the first test specimen portion and the second test specimen portion to the first and second specimen holders; and

applying a load or force to the test specimen secured to the first and second specimen holders of the modular unit.

25. The method of claim 24 wherein the module unit includes a fluid chamber and further comprising supplying the fluid chamber with a test fluid.

26. The method of claim 25 further comprising coupling the modular unit to a temperature control unit to circulate temperature control fluid within the fluid chamber during testing.

27. The method of claim 25 and comprising:

circulating the test fluid into and out of the fluid chamber.

28. The method of claim 24 further comprising

sealing a specimen chamber of the modular unit after connecting the first and second test specimen portions to the first and second specimen holders and prior to connecting the modular unit to the test apparatus.

29. The method of claim 24, wherein the first specimen holder is coupled to a first platform and the second specimen holder is coupled to a second platform and comprising the step of

connecting the first platform to the first portion of the test apparatus after connecting the first test specimen portion to the first specimen holder;

and

connecting the second platform to a second portion of the test apparatus spaced from the first portion of the test apparatus after connecting the second test specimen portion to the second specimen holder.

30. The method of claim 24 wherein inserting the module unit comprising:

engaging one or more pins in one or more slots to align a first platform having the first specimen holder coupled thereto and a second platform having the second specimen holder coupled thereto relative to the first and second portions of the test apparatus.

31. The method of claim 24 and further comprising:

disconnecting the modular unit from the test apparatus following testing.

32. The method of claim 24 and comprising

connecting a first platform coupled to the first specimen holder and a second platform coupled to the second specimen holder through a one piece test specimen attached to the first and second specimen holders;

and

connecting at least one of the first or second platforms to the first or second portions of the test apparatus.

33. The method of claim 24 and comprising:

disconnecting the module unit from the test apparatus; and

disconnecting the first test specimen portion from the first specimen holder and the second test specimen portion from the second specimen holder after disconnecting the module unit from the test apparatus.

34. A kit comprising:

a first specimen holder coupled to a first platform;

a second specimen holder coupled to a second platform; and

at least one fastener element and wherein a test specimen is connected to the first and second specimen holders and wherein the first platform having the first specimen holder is coupled to the second platform having the second specimen holder to form a module unit comprising the first and second specimen holders coupled to the first and second platforms and the module unit is connectable by the at least one fastener element to a test apparatus to test the test specimen.

35. The kit of claim 34 wherein a one piece test specimen is connected to the first and second specimen holders to form the module unit.

36. The kit of claim 34 and comprising an enclosure assembly coupled to the first and second platforms to form the module unit.