Integrated central manifold for orthopedic simulator

• US 7,824,184 B2
• Filed: 01/05/2007
• Issued: 11/02/2010
• 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., Leska, Paul J. Sr., Willis, Dennis J.
• Primary Examiner(s): Fernstrom; Kurt
• Application Number:
  US11/649,961
• Publication Number:
  US 20070169566A1
• Time in Patent Office: 1,397 Days
• Field of Search: 434/262, 434/267, 434/268, 434/270, 434/272, 434/274, 73/37
• US Class Current: 434/262
• 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: G01N 2203/0005 Repeated or cyclic
• CPC Class Codes: G01N 2203/0019 Compressive
• CPC Class Codes: G01N 2203/0021 Torsional
• CPC Class Codes: G01N 2203/0023 Bending
• CPC Class Codes: G01N 2203/0044 Pneumatic means
• CPC Class Codes: G01N 2203/0048 Hydraulic means
• CPC Class Codes: G01N 2203/0069 Fatigue, creep, strain-stress relations or elastic constants
• CPC Class Codes: G01N 2203/0089 Biorheological properties
• CPC Class Codes: G01N 2203/0242 With circulation of a fluid
• CPC Class Codes: G01N 2203/0246 Special simulation of "in situ" conditions, scale models or dummies
• CPC Class Codes: G01N 2203/0476 in parallel
• CPC Class Codes: G01N 3/32 by applying repeated or pulsating forces
• CPC Class Codes: G01N 3/36 generated by pneumatic or hydraulic means

Abstract

An orthopedic simulator is provided with an integral central manifold that provides internal routing of pressurized hydraulic fluid, compressed air, or electrical power to the actuators of the orthopedic simulator. The integral manifold is structurally coupled to support elements and resist and transfer bending and shear forces to the support elements.

Claims

1. An orthopedic simulator comprising:

a frame including at least one support and the at least one support including a first portion and a second portion spaced from the first portion;

at least one holder assembly including an upper adapter and a lower adapter configured to hold a test specimen;

a plurality of actuators coupled to the at least one support of the frame to supply a load or force to the test specimen through at least one of the upper or lower adapters; and

an integral manifold including at least one passage and the plurality of actuators are coupled to the least one passage of the integral manifold to supply the test load or force and the upper adapter being coupled to the first portion of the at least one support and the lower adapter being coupled to the second portion of the at least one support through the integral manifold coupled to the second portion of the at least one support to form a load element to resist and transfer loads or forces.

2. The simulator of claim 1, wherein the integral manifold is a substantially solid block of material forming a manifold housing and the at least one passage is formed in the solid manifold block.

3. The simulator of claim 1, wherein the at least one passages comprises a plurality of fluid tubes formed in a manifold housing of the integral manifold, wherein the plurality of fluid tubes includes a switched pressure tube that provides switched fluid pressure within the manifold housing.

8. The orthopedic simulator of claim 1 wherein the upper adapter is coupled to the at least one support through a gimbal assembly and the plurality of actuators include at least one actuator configured to apply at least one test load or force through the gimbal assembly and the upper adapter to the test specimen.

9. The orthopedic simulator of claim 1 wherein the plurality of actuators each include a movable piston operable to supply the test load or force and the at least one passage is coupled to a fluid source to supply fluid flow to operate the movable pistons of the plurality of actuators.

10. The orthopedic simulator of claim 1 wherein the frame includes a first support and a second support spaced from the first support and the integral manifold is coupled to the first and second spaced supports to form a cross brace.

11. The orthopedic simulator of claim 10 comprising a plurality of holder assemblies to form a plurality of test stations and the plurality of holder assemblies including the upper and lower adapters and each of the test stations includes one or more actuators configured to supply the test load or force and the one or more actuators of each of the test stations are coupled to the at least one passage of the integral manifold coupled to the spaced supports of the simulator.

12. The orthopedic simulator of claim 11 wherein the plurality of test stations includes at least one actuator coupled to the upper adapters of the plurality of test stations to supply the test load or force through the upper adapters and at least one actuator coupled to the lower adapters of the plurality of test stations and configured to supply the test load or force through the lower adapters and each of the at least one actuator coupled to the upper adapters and the at least one actuator coupled to the lower adapters are coupled to the at least one passage of the integral manifold coupled to a fluid source to supply fluid flow.

13. The orthopedic simulator of claim 12 wherein the at least one actuator coupled to the upper adapters of the plurality of test stations is coupled to each of the upper adapters through a linkage assembly.

14. The orthopedic simulator of claim 1 wherein the plurality of actuators comprise at least one actuator coupled to the upper adapter configured to supply at least one of a Mx, My test load or force and at least one actuator coupled to the lower adapter configured to supply at least one of Mz or Fz test load or force.

4. An orthopedic simulator comprising:

a frame;

one or more specimen holder assemblies coupled to the frame;

a plurality of actuators coupled to the frame and the plurality of actuators including a movable piston operable to supply a test load or force to one or more test specimens coupled to the one or more specimen holder assemblies; and

an integral manifold that is structurally coupled to the frame and comprising a supply passage within a housing of the manifold and the plurality of actuators being coupled to the supply passage in parallel to provide fluid flow to move the movable pistons of the plurality of actuators to supply the test load or force to the one or more test specimens.

15. The orthopedic simulator of claim 4 wherein the plurality of actuators include a first actuator and a second actuator and the second actuator is configured to supply a different load or force in a different direction than the first actuator.

16. The orthopedic simulator of claim 4 wherein the simulator includes a plurality of specimen holder assemblies to form a plurality of test stations and the plurality of actuators include a first actuator configured to supply a first force to a first specimen holder assembly and a second actuator configured to supply a second force to a second specimen holder assembly.

17. The orthopedic simulator of claim 16 wherein the first and second actuators are configured to supply the same force to the first and second specimen holder assemblies.

18. The orthopedic simulator of claim 17 and comprising a third actuator configured to supply a third force different from the same force of the first and second actuators and the first and second actuators are fluidly coupled to a pressure passage connected to the supply passage in parallel with the third actuator.

19. the orthopedic simulator of claim 18 wherein the pressure passage is coupled to the supply passage through a valve assembly operable between multiple positions to control fluid flow to the pressure passage.

5. An orthopedic simulator comprising:

a frame;

a plurality of test stations including a specimen holder assembly;

an integral manifold comprising a housing coupled to the frame and the housing comprising a fluid passage;

a plurality of actuators coupled to the frame and the plurality of actuators are operable coupled to the fluid passage in parallel; and

a valve assembly disposed between a fluid source and the fluid passage and configured to control fluid flow from the fluid source to the fluid passage to supply fluid flow to the plurality of actuators.

6. The simulator of claim 5 wherein the plurality of actuators include a piston actuator configured to supply a Fx load input to a plurality of test specimens secured to a plurality of specimen holders of the plurality of test stations.

7. The simulator of claim 5 wherein the manifold comprises a first fluid passage and a second fluid passage and the plurality of actuators are coupled to the first and second fluid passages to supply fluid to and discharge fluid from the plurality of actuators.

20. The orthopedic simulator of claim 5 and including a first fluid passage and a second fluid passage coupleable to first and second actuators through the valve assembly to supply fluid to and discharge fluid from the first and second actuators and the first and second fluid passages are fluidly connecteable to a supply passage in parallel with a third actuator and a discharge passage in parallel with the third actuator.