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1. (WO2019033141) ELECTROMAGNETIC INTRAMEDULLARY NAIL SCREW POSITIONING SYSTEM
ملاحظة: نص مبني على عمليات التَعرف الضوئي على الحروف. الرجاء إستخدام صيغ PDF لقيمتها القانونية

CLAIMS

1. A control apparatus for an electromagnetic intramedullary nail screw positioning system for positioning a drill guide arrangement usable to guide a drill towards a screw receiving aperture in an intramedullary nail, the apparatus comprising:

at least one processor, at least one memory, and a user interface,

wherein the memory comprises a plurality of offset values, each offset value associated with a intramedullary nail identifier, and the memory comprises instructions to cause the processor to:

receive an intramedullary nail identifier from a user via the user interface;

send at least one control signal to one or more signal transmission and receiving circuits to transmit one or more signals from at least one transducer;

receive at least one receive signal from one or more signal transmission and receiving circuits from at least one transducer;

estimate the position of the transducer positioned adjacent the screw receiving aperture relative to the longitudinal axis of the drill guide arrangement using the at least one receive signal;

determine an offset value using the received an intramedullary nail identifier;

apply the determined offset to the estimate the position of the transducer to obtain an updated estimate; and

indicate the updated estimate of the position of the transducer positioned adjacent the screw receiving aperture relative to the longitudinal axis of the drill guide arrangement using the user interface.

2. The control apparatus as claimed in claim 1 , wherein the received nail identifier comprises one or more of a nail diameter, nail composition, nail length and nail side.

3. The control apparatus as claimed in claim 1, wherein the received nail identifier comprises a product code or catalogue number.

4. The control apparatus as claimed in claim 1, wherein the control apparatus comprises a barcode scanner, and the nail identifier is received from the barcode scanner.

5. The control apparatus as claimed in any one of claims 1 to 4, wherein the plurality of offset values are stored as an offset table in the at least one memory, wherein each offset is associated with a nail identifier.

6. The control apparatus as claimed in claim 5, where the offset values are obtained from a reference calibration process performed prior to a surgical procedure, wherein the reference calibration process comprises:

performing a reference calibration using a reference nail with an electromagnetic intramedullary nail screw positioning system;

for each nail in a set of nails types, where each type comprises a unique combination of nail diameter, nail composition and nail length, measuring an alignment offset of an inserted nail in the electromagnetic intramedullary nail screw positioning system with respect to the reference nail; and storing the set of measured alignment offsets in the at least one memory with each associated nail type.

7. The control apparatus as claimed in any one of claims 1 to 6, wherein the control apparatus comprises a display, and indicating the updated estimate of the position of the transducer comprises visually indicating the updated estimate of the position of the transducer positioned adjacent the screw receiving aperture relative to the longitudinal axis of the drill guide arrangement.

8. An electromagnetic intramedullary nail screw positioning system comprising:

a) a framework including:

an intramedullary nail holder adapted to attach to an intramedullary nail; an elongate extension member extending from the intramedullary nail holder adapted to allow movement of the elongate extension member relative to the intramedullary nail holder; and an elongate drill guide arrangement associated with the extension member so that the longitudinal axis of the drill guide arrangement is orientated substantially towards the intramedullary nail;

b) at least two transducers, one transducer positioned in the intramedullary nail adjacent one of the screw apertures, and at least one transducer positioned relative to the elongate extension member; c) one or more signal transmission and receiving circuits for communicating one or more signals with a respective transducer for respectively transmitting and receiving the one or more signals; d) a control apparatus as claimed in any one of claims 1 to 7;

wherein the position of the extension member is movable relative to the intramedullary nail holder until the position indicating device indicates that the transducer positioned adjacent the screw receiving aperture is positioned with respect to the at least one transducer located relative to the extension member, such that a drill guided by the drill guide arrangement would enter, or be directed to a location just above, the screw receiving aperture in the intramedullary nail.

9. The system as claimed in the previous claim, wherein the at least two transducers comprises three transducers, wherein the at least one transducer positioned relative to the elongate extension member comprises two transducers located radially equidistant from the elongate extension member, and estimating the position of the transducer positioned adjacent the screw receiving aperture comprises comparing the signal amplitudes of one or more receive signals from each of the two transducers located radially equidistant from the elongate extension member.

10. A method of generating an offset table for a memory in a controller of an electromagnetic intramedullary nail screw positioning system, the method comprising:

performing a reference calibration using a reference intramedullary nail with an electromagnetic intramedullary nail screw positioning system prior to surgery;

for each intramedullary nail in a set of intramedullary nails types, where each type comprises a unique combination of nail diameter, nail composition and nail length, inserting an intramedullary nail in the electromagnetic intramedullary nail screw positioning system, measuring an alignment offset of the inserted intramedullary nail with respect to the reference nail; and

storing the set of measured alignment offsets in a memory with the associated nail type.

1 1. The method as claimed in claim 1 , further comprising storing the set of measured alignment offsets in a memory of each of a plurality of electromagnetic intramedullary nail screw positioning system.

12. The method as claimed in claim 2, further comprising fitting a predictive model to the measured alignment offsets, and storing the predictive model in a memory of each of a plurality of electromagnetic intramedullary nail screw positioning system.

13. A method for use of an electromagnetic intramedullary nail screw positioning system, comprising:

performing a reference calibration using a reference nail with the electromagnetic intramedullary nail screw positioning system prior to surgery;

entering a nail identifier into a controller of the electromagnetic intramedullary nail screw positioning system, wherein the controller comprises a memory storing an offset associated with the nail identifier;

using the electromagnetic intramedullary nail screw positioning system to estimate a location of a target aperture in the nail, wherein the offset is applied to one or more positioning measurement from the electromagnetic intramedullary nail screw positioning system to generate an updated estimate of the location of a target aperture in the nail, and the updated estimate is indicated to a user.

14. The method as claimed in claim 13, wherein entering a nail identifier comprises entering one or more of a nail diameter, nail composition, nail length and nail side.

15. The method as claimed in claim 13, wherein entering a nail identifier comprises entering a product code or catalogue number.

16. The method as claimed in claim 13, wherein entering a nail identifier comprises scanning a code.