Device and method of spacer and trial design during joint arthroplasty

• US 20070239165A1
• Filed: 03/29/2006
• Published: 10/11/2007
• Est. Priority Date: 03/29/2006
• Status: Abandoned Application

• Current Assignee: Orthos Sensing Technologies
• Original Assignee: Orthos Sensing Technologies
• Inventors: Amirouche, Farid
• Application Number:
  US11/394,306
• Publication Number:
  US 20070239165A1
• Time in Patent Office: Days
• US Class Current: 606/86.R
• CPC Class Codes: A61B 2562/0247 Pressure sensors
• CPC Class Codes: A61B 2562/0252 Load cells
• CPC Class Codes: A61B 2562/0261 Strain gauges
• CPC Class Codes: A61B 2562/046 in a matrix array
• CPC Class Codes: A61B 5/1121 Determining geometric values, e.g. centre of rotation or angular range of movement
• CPC Class Codes: A61B 5/4528 Joints A61B5/4533, A61B5/4538 take precedence
• CPC Class Codes: A61B 5/4585 Evaluating the knee
• CPC Class Codes: A61B 5/7267 involving training the classification device
• CPC Class Codes: A61F 2/38 for elbows or knees
• CPC Class Codes: A61F 2/4657 Measuring instruments used for implanting artificial joints for surgical instruments A61B90/06
• CPC Class Codes: A61F 2/4684 Trial or dummy prostheses
• CPC Class Codes: A61F 2002/4633 for selection of endoprosthetic joints or for pre-operative planning
• CPC Class Codes: A61F 2002/4666 for measuring force, pressure or mechanical tension

Abstract

A spacer block for gathering data to be used in selection of a trial insert includes a first body piece, a second body piece positioned on top of the first body piece, and at least one chim positioned on top of the second body piece. The first body piece includes at least one sensor to measure forces between the first and second body pieces, and the spacer block includes a processor having a memory operatively coupled to the sensor. The data can be analyzed using a trained neural network to provide feedback to a physician to aid in the determination of whether to resect additional bone, release soft tissues, and/or select sizes for a trial insert. Advantageously, increased data may be provided to a physician without the need to acquire numerous samples from a patient, and fewer sensors may be employed.

Claims

1-18. -18. (canceled)

19. A system that gathers information to select a trial insert, comprising:

a first body piece and a second body piece positioned on top of the first body piece;

a sensor positioned between the first body piece and the second body piece;

a processor positioned between the first body piece and the second body piece, the processor coupled with the sensor; and

a chim removably mounted to an exterior surface of the second body piece, the chim positioned in relation to the sensor such that a force exerted on the chim is detected by the sensor.

20. The system of claim 19, where the first body piece comprises a pole extending vertically upward in relation to a first surface of the first body piece, the sensor mounted on the pole.

21. The system of claim 20, where the second body piece comprises an aperture configured to receive the pole.

22. The system of claim 20, where the sensor is configured to measure an amount of compression experienced by the pole as a result of a force exerted on the chim.

23. The system of claim 20, where the sensor is configured to measure an amount of tension experienced by the pole as a result of a force exerted on the chim.

24. The system of claim 20, where the sensor is configured to measure an amount of bending force experienced by the pole as a result of a force exerted on the chim.

25. The system of claim 19, where the sensor comprises a load cell.

26. The system of claim 19, where the sensor comprises a strain gauge.

27. The system of claim 19, further comprising a transmitter configured to transmit data from the processor to a remote receiver.

28. The system of claim 19, further comprising a handle mounted to the first or second body piece.

29. The system of claim 28, where the handle is detachably connected to the first or the second body piece.

30. The system of claim 28, where the handle and the first or the second body pieces comprise an electrical connection.

31. The system of claim 30, where the handle comprises a transmitted coupled with the processor through the electrical connection, the transmitter configured to transmit data between the processor and a remote processor.

32. A system that gathers information used to select a trial insert, comprising:

a first body piece comprising a plurality of poles extending vertically upward in relation to a first surface of the first body piece;

a second body piece configured to mate with the first body piece;

a chim removably mounted to an exterior surface of the second body piece; and

means for measuring a force experienced by at least one of the poles as a result of a force exerted on the chim.

33. The system of claim 32, further comprising means for transmitting a measured force to a remote processor.

34. A method to select a joint trial insert, comprising:

providing a spacer block comprising a first body piece and a second body piece mated together, the first body piece comprising a pole extending vertically upward from a first surface of the first body piece, and the second body piece comprising an aperture to receive the pole when the first and second body pieces are mated together;

mounting a chim to an exterior surface of the spacer block;

inserting the chim and spacer block into a joint;

manipulating the joint so a force is exerted on the chim; and

collecting data representative of a difference between an initial position of the pole and a later position of the pole resulting from the force exerted on the chim,

where at least one sensor is mounted on the pole.

35. The method of claim 34, further comprising analyzing the collected data to determine whether to mount a thicker or thinner chim on the spacer block.

36. The method of claim 35, further comprising mounting a different size chim on the spacer block.

37. The method of claim 35, where the act of analyzing the collected data comprises performing a neural network analysis on the collected data.

38. The method of claim 34, where the act of collecting data comprises transmitting data representative of the difference between an initial position of the pole and the later position of the pole resulting from the force exerted on the chim to a remote processor in substantially real-time.