Orthopedic simulator with temperature controller arrangement for controlling temperature of specimen baths

• US 7,770,446 B2
• Filed: 01/05/2007
• Issued: 08/10/2010
• Est. Priority Date: 01/13/2006
• Status: Active Grant

• 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): THOMPSON, JEWEL VERGIE
• Application Number:
  US11/649,960
• Publication Number:
  US 20070169565A1
• Time in Patent Office: 1,313 Days
• Field of Search: 738/612.7, 738/612.6, 422/109, 426/521, 101/216
• US Class Current: 73/204.19
• CPC Class Codes: A61F 2/44 for the spine, e.g. vertebrae, spinal discs
• CPC Class Codes: A61F 2/468 Testing instruments for artificial joints for testing non-implantable prostheses A61F2/76
• CPC Class Codes: G01N 2203/0021 Torsional
• CPC Class Codes: G01N 2203/0023 Bending
• CPC Class Codes: G01N 2203/0089 Biorheological properties
• CPC Class Codes: G01N 2203/0222 Temperature
• CPC Class Codes: G01N 2203/0242 With circulation of a fluid
• CPC Class Codes: G01N 2203/0256 Triaxial, i.e. the forces being applied along three normal axes of the specimen
• CPC Class Codes: G01N 3/32 by applying repeated or pulsating forces
• CPC Class Codes: G01N 3/56 Investigating resistance to wear or abrasion

Abstract

An orthopedic simulator is provided with a temperature control arrangement for controlling the temperature of a plurality of baths of test stations that are configured to contain a sample under test within a specimen bath. The temperature control arrangement includes fluid circulation tubing that carries temperature control fluid to the baths to control the temperature of the baths through heat exchange.

Claims

1. An orthopedic simulator assembly comprising:

at least one test station including a specimen container configured to contain a specimen bath;

a heat exchange tube coupled to the specimen container separate from the specimen bath and configured to circulate a temperature control fluid separate from fluid in the specimen bath; and

a fluid circulation assembly configured to circulate the temperature control fluid to the heat exchange tube.

2. The simulator assembly of claim 1, wherein the heat exchange tube includes an inlet and an outlet and the fluid circulation assembly is coupled to the inlet and outlet of the heat exchange tube to circulate the temperature control fluid through the heat exchange tube.

3. The simulator of claim 1, wherein the fluid circulation assembly includes one or more heating devices to provide the temperature control fluid and the simulator assembly includes a temperature probe coupled to the specimen bath configured to provide a feedback temperature of the specimen bath to control the one or more heating devices.

4. The simulator of claim 1, wherein the assembly includes a plurality of test stations each including a heat exchange tube and the heat exchange tubes of the plurality of test stations are connected in series to form a fluid circulation loop to circulate the temperature control fluid such that temperature control fluid passes through each of the heat exchange tubes to control the temperature of a plurality of specimen baths.

5. The simulator of claim 1, wherein the assembly comprises a plurality of test stations each including a heat exchange tube and comprising a plurality of the temperature fluid control circuits, with the heat exchange tubes of the plurality of test stations being separately connected to a respective one of the temperature fluid control circuits.

15. The simulator assembly of claim 1 and further comprising one or more heating devices configured to heat the temperature control fluid.

16. The simulator assembly of claim 1 and further comprising a holder assembly configured to hold a test specimen immersed in the specimen bath.

17. The simulator assembly of claim 16 and comprising at least one actuator assembly configured to supply a load input to the test specimen secured to the holder assembly.

6. An orthopedic simulator comprising:

a holder assembly configured to hold a test specimen;

a container assembly containing a fluid bath and the holder assembly configured to hold the test specimen immersed in the fluid bath; and

a heat exchange passage disposed relative to the fluid bath and having a barrier separating a temperature control fluid in the heat exchange passage from the fluid bath and the heat exchange passage having an inlet to receive the temperature control fluid and an outlet to circulate the temperature control fluid through the heat exchange passage.

7. The simulator of claim 6 and comprising a fluid circulation assembly configured to circulate the temperature control fluid through the heat exchange passage via a temperature control fluid circulation loop.

8. The simulator of claim 7, and comprising a plurality of test stations, and the temperature control fluid circulation loop circulates the temperature control fluid in series to a plurality of heat exchange passages for the plurality of test stations to control a temperature of a plurality of fluid baths for the plurality of test stations.

9. The simulator of claim 7, comprising a plurality of test stations and wherein the fluid circulation assembly comprises a single temperature control fluid circulation loop shared by at least some of the plurality of test stations, the at least some of the plurality of test stations being coupled to the temperature control fluid circulation loop serially.

10. The simulator of claim 7, wherein the control fluid circulation assembly includes at least one heater and comprising at least one temperature sensor configured to provide a feedback temperature to control the at least one heater to control a temperature of the temperature control fluid within the fluid circulation loop based on the temperature sensed by the at least one temperature sensor.

14. The simulator of claim 7, and comprising a plurality of test stations including a plurality of fluid baths and a plurality of heat exchange passages wherein each of the plurality of test stations has a separate fluid circulation loop to circulate the temperature control fluid to the respective heat exchange passages.

18. The simulator of claim 6 and comprising at least one actuator device coupled to the holder assembly to supply a load input to the test specimen secured to the holder assembly.

19. The simulator of claim 7 wherein the fluid circulation assembly includes at least one heater device configured to heat the temperature control fluid.

20. The simulator of claim 7 wherein the container assembly includes an inlet to fill the fluid bath via operation of a pump.

11. An assembly comprising:

a plurality of test stations comprising a plurality of fluid baths; and

a fluid circulation assembly including a plurality of fluid circulation passages adjacent to each of the plurality of fluid baths and the plurality of fluid circulation passages configured to carry a temperature control fluid separate from a fluid in the plurality of fluid baths and

a fluid circuit in fluid communication with the plurality of fluid circulation passages configured to circulate the temperature control fluid to the fluid circulation passages to control a temperature of the fluid baths.

12. The assembly of claim 11, wherein the fluid circulation assembly includes one or more heaters and the fluid circuit forms a single continuous circulation loop serially connecting the plurality of fluid circulation passages to the one or more heaters.

13. The assembly of claim 12, further comprising a temperature probe configured to provide a temperature feedback signal to control a temperature of the temperature control fluid.

21. The assembly of claim 11 and wherein each of the plurality of fluid baths includes an inlet and comprising at least one pump to supply fluid to the fluid baths through the inlets.

22. The assembly of claim 11 and comprising a holder assembly including a first holder and a second holder to secure a test specimen immersed in the fluid bath and the assembly comprising one or more actuator devices coupled to the first or second holder to supply one or more load forces to the test specimen through the first or second holders.