Device and method for measuring force systems

• US 5,791,350 A
• Filed: 06/07/1995
• Issued: 08/11/1998
• Est. Priority Date: 06/07/1995
• Status: Expired due to Fees

• Current Assignee: Morton, John Y.
• Original Assignee: Morton, John Y.
• Inventors: Morton, John Y.
• Primary Examiner(s): Schmidt, Jeffrey A.
• Assistant Examiner(s): RASCHE, PATRICK WILLIAM
• Application Number:
  US08/482,611
• Time in Patent Office: 1,161 Days
• Field of Search: 128/774, 128/782, 128/781, 128/776, 128/777, 73/862.45, 73/862.53, 73/862.473, 73/862.474, 73/862.451, 73/781, 73/782
• US Class Current: 600/590
• CPC Class Codes: A61B 17/88 Osteosynthesis instruments; Methods or means for implanting or extracting internal or external fixation devices A61B17/7074 takes precedence
• CPC Class Codes: A61B 2090/031 torque limiting
• CPC Class Codes: A61B 2090/064 for measuring force, pressure or mechanical tension
• CPC Class Codes: A61B 5/224 Measuring muscular strength
• CPC Class Codes: A61B 5/4547 Evaluating teeth
• CPC Class Codes: A61B 90/06 Measuring instruments not otherwise provided for
• CPC Class Codes: A61C 19/04 Measuring instruments specially adapted for dentistry A61C5/44 takes precedence; testing vitality of teeth A61B5/0534; radiation diagnosis specially adapted for dentistry A61B6/51
• CPC Class Codes: A61C 7/02 Tools for manipulating or working with an orthodontic appliance tools for placement of brackets A61C7/146; instruments for attaching elastic bands A61C7/306

Abstract

A device and method for measuring force systems is provided. The device measures and displays one or more components of a force system generated by medical or dental appliances or body tissues. The invention provides a probe or attachment device for engaging the structure to be measured, such as orthodontic springs, wires, and appliances; surgical fixation devices; and body tissue. The probe transmits the force system produced by the structure to a sensor bar which is attached to the probe. The sensor bar resolves the force system being measured into electrical signals. A device is used to display representations of the electrical signals.

Claims

1. A force system measuring instrument comprising:

a probe adapted to transmit said force system;

sensor means for resolving said force system into electrical signals proportional to components of said force system, said force system comprised of more than one component, said sensor means attached to said probe;

means for displaying representations of said electrical signals.

2. The force system measuring instrument of claim 1 wherein components of said force system are measured simultaneously.

3. The force system measuring instrument of claim 1 wherein said probe further comprises a mechanism adapted to contact a structure carrying a force system.

4. The force system measuring instrument of claim 3 wherein said structure is an orthodontic device.

5. The force system measuring instrument of claim 3 wherein said structure is animal tissue.

6. The force system measuring instrument of claim 3 wherein said structure is a surgical fixation device.

7. The force system measuring instrument of claim 1 wherein said instrument has an ability to measure force systems with a range of forces of ±

45 Kg and a range of moments of ±

20 Nm.

8. The force system measuring instrument of claim 1 wherein said instrument has an ability to measure force systems with a range of forces of ±

600 g and a range of moments of ±

4000 gmm.

9. The force system measuring instrument of claim 1 wherein said instrument has an ability to measure force systems with a range of forces of ±

2 Kg and a range of couples of ±

6000 gmm.

10. The force system measuring instrument of claim 1 wherein said instrument has a measuring accuracy of ±

1 g of force and ±

10 gmm couple.

11. The force system measuring instrument of claim 1 wherein said instrument has a measuring accuracy of ±

0.1 g of force and ±

1 gmm couple.

12. The force system measuring instrument of claim 1, said sensor means comprising:

a beam;

a plurality of strain gages fixably attached to said beam, said strain gages adapted to resolve said force system into electrical signals;

wherein said strain gages are resistive strain gages.

13. The force system measuring instrument of claim 1, said sensor means comprising:

a beam;

a plurality of strain gages fixably attached to said beam, said strain gages adapted to resolve said force system into electrical signals;

wherein said strain gages are piezoresistive strain gages.

14. The force system measuring instrument of claim 1, said sensor means comprising;

a large tube, said large tube having a bore and a major axis, said bore aligned along the major axis of said large tube;

a small tube, said small tube coaxially aligned with said bore of said large tube and partially contained within said bore of said large tube;

a plurality of strain gages fixably attached to said large tube and said small tube, said strain gages adapted to resolve said force system into electrical signals.

15. The force system measuring instrument of claim 14 wherein said strain gages attached to said large tube are adapted to measure forces and said strain gages attached to said small tube are adapted to measure couples.

16. The force system measuring instrument of claim 1 wherein said sensor means is removably attached to said probe.

17. The force system measuring instrument of claim 1 wherein said probe is adapted for use within an animal body.

18. The force system measuring instrument of claim 1 wherein said sensor means comprises a sensor bar adapted to resolve said force system into electrical signals corresponding to the strain due to bending in said sensor bar.

19. A force system measuring instrument comprising

a probe, said probe having a base and a tip, said tip adapted to contact an orthodontic device;

sensor means for resolving said force system into electrical signals proportional to components of said force system, said force system comprised of more than one component, said sensor means having a first end and a second end, said first end attached to said base of said probe, said sensor means further comprising a beam and a plurality of strain gages fixably attached to said beam, said strain gages adapted to resolve said force system into electrical signals;

a housing, said housing having a cavity therein, said housing having a support, said second end of said sensor means attached to said support, said sensor means contained within said housing;

a display adapted to display representations of said electrical signals;

means for electrically connecting said strain gages with said display and for providing said strain gages with electrical power.

20. The force system measuring instrument of claim 19 further comprising:

a sheath adapted to protect said sensor means from contamination, said sheath having portions defining a hole, said probe extending through said hole.

21. A force system measuring instrument comprising:

probe means for transmitting said force system;

sensor means for resolving said force system into electrical signals proportional to components of said force system, said force system comprised of at least one moment component, said sensor means attached to said probe;

means for displaying representations of said electrical signals.