Methods and systems for adjusting an external fixation frame

Patent metadata

Field	Value
Publication number	US-12150677-B2
Application number	US-202318330460-A
Country	US
Kind code	B2
Filing date	Jun 7, 2023
Priority date	Jun 23, 2011
Publication date	Nov 26, 2024
Grant date	Nov 26, 2024

Abstract

A tool for implementing a correction plan in an external fixation frame having a plurality of adjustment elements or screws, for example, generally includes a driver, a motor, a controller, and a processor. The driver is adapted to engage and rotate each of the screws. The motor is coupled the driver and adapted to rotate the driver. The controller is connected to the motor and configured to control operation of the motor. The processor adapted configured to: receive correction plan data; receive identification data including information for identifying at least one of the plurality of screws; determine movement of at least one of the plurality of the screws based on the correction plan data and the identification data; and send signals indicative of the determined movement to the controller in order to rotate at least one of the plurality of screws according to a predetermined correction plan.

First claim

The invention claimed is:

1. A method for implementing a predetermined correction plan in an external fixation frame having a first fixation ring coupled to a second fixation ring by plurality of adjustable-length struts, the method comprising:
receiving correction plan data in a tool for implementing the predetermined correction plan, the correction plan data including information about the predetermined correction plan for adjusting one of the adjustable-length struts of the external fixation frame;
determining, via a processor operably coupled to the tool, a prescribed length change of the one of the adjustable-length struts based on the correction plan data;
while the tool is engaged to the one of the adjustable-length struts, operating a motor of the tool to start adjusting a length of the one of the adjustable-length struts according to the prescribed length change determined by the processor;
while the length of the one of the adjustable-length struts is being adjusted, measuring an angular position of the one of the adjustable-length struts using an angular position sensor operably coupled to the tool; and
based on the measured angular position of the one of the adjustable-length struts, determining whether the one of the adjustable-length struts has been completely adjusted according to the prescribed length change.

2. The method of claim 1 , wherein:
determining whether the one of the adjustable-length struts has been completely adjusted according to the prescribed length change results in a determination that the one of the adjustable-length struts has not been completely adjusted according to the prescribed length change; and
based on this determination, a motor controller operably coupled to the motor instructs the motor to continue adjusting the length of the one of the adjustable-length struts according to the prescribed length change.

3. The method of claim 1 , wherein:
determining whether the one of the adjustable-length struts has been completely adjusted according to the prescribed length change results in a determination that the one of the adjustable-length struts has been completely adjusted according to the prescribed length change; and
based on this determination, a motor controller operably coupled to the motor instructs the motor to stop adjusting the length of the one of the adjustable-length struts.

4. The method of claim 1 , wherein the angular position sensor includes a rotary encoder.

5. The method of claim 4 , wherein the rotary encoder is an absolute encoder.

6. The method of claim 1 , wherein the angular position sensor is disposed on a shaft of the motor.

7. The method of claim 1 , wherein upon disengagement of the tool from the one of the adjustable-length struts prior to fully adjusting the length of the one of the adjustable-length struts according to the prescribed length change, a controller of the tool receives, from the processor, a signal indicative of the disengagement.

8. The method claim 7 , further comprising:
re-engaging the tool to the one of the adjustable-length struts following the disengagement but prior to fully adjusting the length of the one of the adjustable-length struts according to the prescribed length change.

9. The method of claim 8 , further comprising:
after re-engaging the tool to the one of the adjustable-length struts, finishing fully adjusting the length of the one of the adjustable-length struts according to the prescribed length change.

10. The method of claim 1 , further comprising:
receiving, via the tool, identification data including information for identifying the one of the adjustable-length struts.

11. The method of claim 10 , wherein the tool includes an RFID reader adapted to receive a signal containing the identification data, the identification data originating from an RFID tags attached to the one of the adjustable-length struts.

12. The method of claim 1 , further comprising:
after receiving the correction plan data, validating the correction plan data via a correction application stored on a memory module of the tool.

13. The method of claim 1 , wherein the tool includes a display unit.

14. The method of claim 1 , wherein the tool includes a power source, the power source being a battery.

15. The method of claim 1 , wherein the tool includes a driver for engaging the one of the plurality of adjustable-length struts.

16. The method of claim 15 , wherein the angular position sensor is disposed on the driver.

17. The method of claim 16 , wherein the angular position sensor is a rotary encoder.

Assignees

• Stryker European Operations Holdings Llc

Inventors

• Burgherr Vinzenz Andreas
• Edelhauser Adam John
• Crozet Yves Stephane
• Aeschlimann Marcel
• Dworzak Christoph
• Lanci Antonino
• Mast Markus

Classifications

• G16H50/50

  for simulation or modelling of medical disorders · CPC title

• A61B34/10

  Computer-aided planning, simulation or modelling of surgical operations · CPC title

• A61B2090/061

  for measuring dimensions, e.g. length · CPC title

• A61B90/98

  using electromagnetic means, e.g. transponders · CPC title

• A61B2090/067

  for measuring angles · CPC title