Powered surgical tool with control module that contains a sensor for remotely monitoring the tool power generating unit

• US 7,638,958 B2
• Filed: 06/21/2006
• Issued: 12/29/2009
• Est. Priority Date: 06/28/2005
• Status: Active Grant

• Current Assignee: Stryker Corporation
• Original Assignee: Stryker Corporation
• Inventors: Philipp, Christopher, Malackowski, Don
• Primary Examiner(s): Ro; Bentsu
• Assistant Examiner(s): DINH, THAI T
• Application Number:
  US11/472,012
• Publication Number:
  US 20070085496A1
• Time in Patent Office: 1,287 Days
• Field of Search: 318/114, 318/119, 318/280, 318/139, 318/647, 318/652, 318/663, 318/671
• US Class Current: 318/139
• CPC Class Codes: A61B 17/15 Guides therefor arrangements for guiding straight saw blades in general B23D51/025
• CPC Class Codes: A61B 17/151 for corrective osteotomy
• CPC Class Codes: A61B 17/1622 Drill handpieces A61B17/1626, A61B17/1628 take precedence
• CPC Class Codes: A61B 17/1626 Control means; Display units
• CPC Class Codes: A61B 17/1697 specially adapted for wire insertion
• CPC Class Codes: A61B 17/32002 with continuously rotating, oscillating or reciprocating cutting instruments
• CPC Class Codes: A61B 2017/00017 Electrical control of surgical instruments
• CPC Class Codes: A61B 2017/00367 Details of actuation of instruments, e.g. relations between pushing buttons, or the like, and activation of the tool, working tip, or the like
• CPC Class Codes: A61B 2017/00734 battery operated
• CPC Class Codes: A61B 2034/2048 using an accelerometer or inertia sensor
• CPC Class Codes: A61B 2034/2051 Electromagnetic tracking systems
• CPC Class Codes: A61B 2034/2055 Optical tracking systems
• CPC Class Codes: A61B 34/20 Surgical navigation systems; Devices for tracking or guiding surgical instruments, e.g. for frameless stereotaxis
• CPC Class Codes: B01F 31/40 with an axially oscillating rotary stirrer
• CPC Class Codes: B01F 33/50111 Small portable bottles, flasks, vials, e.g. with means for mixing ingredients or for homogenizing their content, e.g. by hand shaking
• CPC Class Codes: B01F 33/50115 Stirring devices adapted to be connected to a standard boring machine or other kind of domestic tool
• CPC Class Codes: B01F 35/2207 Use of data, i.e. barcodes, 3D codes or similar type of tagging information, as instruction or identification codes for controlling the computer programs, e.g. for manipulation, handling, production or compounding in mixing plants B01F33/848 takes precedence
• CPC Class Codes: B01F 35/2209 Controlling the mixing process as a whole, i.e. involving a complete monitoring and controlling of the mixing process during the whole mixing cycle
• CPC Class Codes: B01F 35/221422 Speed of rotation of the mixing axis, stirrer or receptacle during the operation
• CPC Class Codes: B01F 35/22161 duration of the mixing process or parts of it
• CPC Class Codes: B01F 35/332 : alternately changing the direction of rotation
• CPC Class Codes: B01F 35/90 : Heating or cooling systems
• CPC Class Codes: H02K 11/215 : Magnetic effect devices, e.g. Hall-effect or magneto-resistive elements
• CPC Class Codes: H02K 11/33 : Drive circuits, e.g. power electronics H02K11/38 takes precedence
• CPC Class Codes: H02K 7/145 : Hand-held machine tool
• CPC Class Codes: H02P 6/16 : Circuit arrangements for detecting position
• CPC Class Codes: H02P 7/06 : for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current

Abstract

A powered surgical tool with a housing that contains a power generating unit such as a motor. A control module is disposed in a shell that is mounted in the housing. The control module contains a control circuit for regulating the actuation of the power generating unit. The power generating unit emits a signal representative of the operating state of the unit that is transmitted through the structural material forming the shell. Also internal to the control module shell is a sensor that monitors the signal emitted by the power generating unit. This signal output by the sensor is applied to the control circuit. The control circuit, based on the sensor signal regulates actuation of the power generating unit. Wherein the power generating unit is a motor, the signal emitted is the magnetic field that varies with rotor position. The sensor monitors the strength of this field.

Claims

1. A powered surgical tool including:

a housing;

a power generating unit disposed in said housing, said power generating unit configured to emit a variable signal representative of the operation said power generating unit, wherein the signal is in the form of;

a magnetic field;

a RF signal;

a light signal;

or mechanical energy;

an attachment that extends from said housing that is connected to and actuated by said power generating unit for performing a surgical/medical task;

a control assembly with an actuatable control member mounted to said housing for regulating actuation of said power generating unit, said control assembly emitting a control signal in response to actuation of said control member; and

a control module disposed in the housing, the control module having;

a shell formed from at least one structural member, said at least one structural member being formed from material through which the signal from said power generating unit passes therethrough;

a sensor disposed in said shell, said sensor configured to monitor the signal transmitted by said power generating unit through the said shell structural member through which the signal can pass and, based on the monitored signal, output a sensor signal the sensor signal being in the form of an electrical signal; and

a control circuit in the shell for receiving the control signal from said control assembly and the sensor signal from said sensor that, based on the control signal and the sensor signal, selectively actuates the power generating unit.

2. The powered surgical tool of claim 1 wherein the power generating unit is a motor having a rotor and said motor emits a signal representative of rotational position of the motor rotor.

3. The powered surgical tool of claim 1, wherein:

said power generating unit outputs a variable magnetic signal as a function of the state of the power generating unit;

said housing at least one structural member is formed from a material that allows magnetic fields to be transmitted therethrough; and

said sensor is a magnetic field sensor.

4. The powered surgical tool of claim 1, wherein said sensor and said control circuit are hermetically sealed in said control module shell.

5. The powered surgical tool of claim 1 further including a coupling assembly for releasably holding said attachment to said housing and connecting the attachment for to said power generating unit.

6. A powered surgical tool including:

a housing;

a power generating unit disposed in the housing;

an attachment that extends from the housing that is connected to and actuated by the power generating unit for performing a surgical/medical task;

an actuatable control member mounted to the housing for regulating the actuation of the power generating unit, said control member configured to, in response to actuation of said control member, output control member control signals;

a receiver attached to said housing for receiving wireless signals that contain instructions for regulating the actuation of the power generating unit, said receiver configured to, in response to receipt of the wireless signals, generate instruction signals; and

a programmable control unit disposed in said housing for receiving the control member control signals, the receiver instruction signals and user-programmed instructions that correlate the control member control signals to user-specified actuation signals, said control unit configured to;

based on receipt of the control member control signals and the user-programmed instructions, generate variable actuation signals; and

based on receipt of the receiver instructions signals, and the variable actuation signals, selectively generate modified actuation signals; and

a power regulator disposed in said housing for receiving the modified actuation signals and configured to, based on the modified actuation signals, regulate the actuation of the power generating unit.

7. The powered surgical tool of claim 6, wherein:

said programmable control unit is configured to, based on the control member control signals and the user-programmed instructions, output the variable actuation signals that are representative of a user-programmed operating rate for said power generating unit;

said programmable control unit is further configured to, based on the receiver instruction signals and the variable actuation signals, generate the modified actuation signals that are representative of a modified operating rate for said power generating unit; and

the power regulator, based on receipt of the modified actuation signals, regulates the actuation of said power generating unit so as to cause the unit to operate at the modified operating rate.

8. The powered surgical tool of claim 6, wherein:

said power generating unit is a variable speed motor;

said programmable control unit is configured to output the variable actuation signals so that the signals are representative of a user-programmed motor speed;

said programmable control unit is further configured to, based on the receiver instruction signals and the variable actuation signals generate the modified actuation signals so that the modified actuation signals are representative of a modified motor speed; and

said power regulator is configured to, upon receipt of the modified actuation signals, regulate the actuation of the motor so that the motor operates at the modified motor speed.

9. The powered surgical tool of claim 6, wherein:

said power generating unit is a motor capable of variable direction rotation;

said programmable control unit is configured to, based on receipt of the control signal, output a variable actuation signal representative of a user programmed motor rotational direction; and

said power regulator, based on receipt of the actuation signal regulates the actuation of the motor so that the motor turns in the user programmed direction.

10. A powered surgical tool, said power surgical tool including:

a housing;

a power generating unit disposed in said housing, said power generating unit configured to emit a variable power generating unit signal representative of the operation said power generating unit, wherein the signal is in the form of;

a magnetic field;

a RF signal;

a light signal;

or mechanical energy;

an attachment that extends from said housing that is connected to and actuated by said power generating unit for performing a surgical/medical task;

a manually actuatable control member that is moveably attached to said housing, said control member being configured to emit a control member signal representative of actuation of said control member; and

a control module disposed in said housing, said control module having;

a shell, said shell including a structural member through which the power generating unit signal is transmitted wirelessly therethrough and a structural member through which the control member signal is transmitted wirelessly therethrough;

a first sensor assembly disposed in said shell for receiving therethrough the signal from said power generating unit that, in response to the received signal, generates a first sensor signal that is representative of power generating unit signal;

a second sensor assembly disposed in said shell for receiving therethrough the signal from said control member that, in response to the received signal, generates a second sensor signal that is representive of the control member signal; and

a control circuit in the shell for receiving the first sensor signal and the second sensor signal that, based on the sensor signals, selectively actuates the power generating unit.

11. The powered surgical tool of claim 10, wherein said sensor assemblies and said control circuit are hermetically sealed in said control module shell.

12. The powered surgical tool of claim 10, wherein:

said first sensor assembly outputs the first sensor signal as a repeating cyclic signal as a function of the power generating unit signal; and

said control circuit is further configured to;

determine for the first sensor signal in which portion of signal cycle the signal is in; and

based on in which portion of the signal cycle the first sensor signal is in, selectively actuate the power generating unit.

13. The powered surgical tool of claim 10, wherein:

said first sensor assembly includes a plurality of sensors that generate electrical signals as a function of the signal monitored by said sensors, each first sensor assembly sensor outputting a distinct sensor signal, wherein at least one of the first sensor assembly sensor signals is a cyclic signal that is a function of the power generating unit signal monitored by said sensor; and

said control circuit is further configured to;

receive from said first sensor assembly the plurality of sensor signals; and

based on the plurality of signals from the first sensor assembly sensors, selectively actuate said power generating unit.

14. The powered surgical tool of claim 10, wherein:

said first sensor assembly outputs the first sensor signal as a repeating cyclic signal that is output as a function of the signal monitored by said sensor, wherein the signal has peaks and valleys and the peaks and valleys of the signal change over time;

said control circuit is further configured to;

capture data representative of the changing peaks and valleys of the first sensor signal;

based on the captured peaks and valleys of the first sensor signal, continually generate comparison values for the first sensor signal;

compare the first sensor signal to the comparison values to determine in which portion of the cycle the first sensor signal is in; and

based on the portion of the cycle the first sensor signal is in, selectively actuate said power generating unit.

15. A powered surgical tool, said power surgical tool including:

a housing;

a motor disposed in said housing, said motor having a rotor and configured to wirelessly emit a signal representative of rotor position;

an attachment that extends from said housing that is connected to and actuated by said rotor for performing a surgical/medical task;

a manually actuatable control member that is moveably attached to said housing; and

a control module disposed in said housing, said control module having;

a shell, said shell including a structural member through which the signal emitted by said motor is transmitted wirelessly therethrough;

a first sensor assembly disposed in said shell for receiving wirelessly therethrough the signal from said motor that, said first sensor assembly configured to, in response to the received signal, generate a rotor state signal representative of the position of said motor rotor, the rotor state signal being an electrical signal; and

a control circuit in the shell for receiving the rotor state signal and a control signal that is based on the actuation of said control member, said control member configured to, based on the received signals, selectively actuate said motor.

16. The powered surgical tool of claim 15, wherein said first sensor assembly and said control circuit are hermetically sealed in said control module shell.

17. The powered surgical tool of claim 15, wherein:

said motor emits a magnetic field that varies as a function of the position of said motor rotor;

said shell structural member is formed from material which allows a magnetic field to pass therethough; and

said first sensor assembly includes at least one sensor that, based on the magnetic field emitted by said motor, generates the rotor state signal.

18. The powered surgical tool of claim 15, wherein:

said first sensor assembly includes a plurality of sensors, each said sensor emitting a distinct signal representative of rotor position; and

said control circuit, at least upon initial actuation of said motor, determines motor rotor position based on the signals from the plurality of said first sensor assembly sensors.

19. The powered surgical tool of claim 15, wherein:

said sensor assembly outputs the rotor state signal as a repeating cyclic signal that is output as a function of the signal emitted by said motor, wherein the rotor state signal has peaks and valleys and the peaks and valleys of the signal change over time;

said control circuit is further configured to;

capture data representative of the changing peaks and valleys of the rotor state signal;

based on the captured peaks and valleys of the rotor state signal, continually generate comparison values for the rotor state signal;

compare the rotor state signal to the comparison values to determine in which portion of the cycle the rotor state signal is in; and

based on the portion of the cycle the first sensor signal is in, selectively actuate said power generating unit.

20. The powered surgical tool of claim 15, wherein:

said control member wirelessly transmits a signal based on the actuation of said control member through said shell;

said control module further includes, disposed in said shell, a second sensor assembly that receives the signal from said control member transmitted through said shell, said second sensor assembly configured to, in response to the received control member signal, generate the control signal as an electrical signal for application to said control module control circuit.