WO2023048948A1 - Mécanisme de réglage rapide d'une entretoise motorisée dans un cadre spatial - Google Patents

Mécanisme de réglage rapide d'une entretoise motorisée dans un cadre spatial Download PDF

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Publication number
WO2023048948A1
WO2023048948A1 PCT/US2022/042863 US2022042863W WO2023048948A1 WO 2023048948 A1 WO2023048948 A1 WO 2023048948A1 US 2022042863 W US2022042863 W US 2022042863W WO 2023048948 A1 WO2023048948 A1 WO 2023048948A1
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WO
WIPO (PCT)
Prior art keywords
motorized
strut
jaw members
inner body
struts
Prior art date
Application number
PCT/US2022/042863
Other languages
English (en)
Inventor
Paul Bell
Sied W. Janna
Darren J. Wilson
Original Assignee
Smith & Nephew, Inc.
Smith & Nephew Orthopaedics Ag
Smith & Nephew Asia Pacific Pte. Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Smith & Nephew, Inc., Smith & Nephew Orthopaedics Ag, Smith & Nephew Asia Pacific Pte. Limited filed Critical Smith & Nephew, Inc.
Publication of WO2023048948A1 publication Critical patent/WO2023048948A1/fr

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/60—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like for external osteosynthesis, e.g. distractors, contractors
    • A61B17/62—Ring frames, i.e. devices extending around the bones to be positioned
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/60—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like for external osteosynthesis, e.g. distractors, contractors
    • A61B17/66—Alignment, compression or distraction mechanisms

Definitions

  • the present disclosure relates generally to orthopedic devices, systems, and methods for facilitating fracture alignment such as the treatment of musculoskeletal conditions with a spatial frame, and particularly to motorized struts for use in a spatial frame, the motorized struts including and/or being operatively associated with an adjustment mechanism arranged and configured to transition the motorized struts between first and second modes of operation so that in the first mode of operation, surgeons can quickly adjust the length of the motorized struts to, for example, initially setup the spatial frame.
  • a person that suffers a bone fracture is required to use a bone alignment device such as, for example, an external fixation system, a spatial frame, a hexapod, etc. (terms used interchangeably herein without the intent to limit or distinguish) to align two or more bones, bone fragments, bone pieces, etc. (terms used interchangeably herein without the intent to limit or distinguish).
  • a bone alignment device such as, for example, an external fixation system, a spatial frame, a hexapod, etc. (terms used interchangeably herein without the intent to limit or distinguish) to align two or more bones, bone fragments, bone pieces, etc. (terms used interchangeably herein without the intent to limit or distinguish).
  • spatial frames allow for polyaxial movement of the coupled bones and are typically used to keep fractured bones stabilized and in alignment during the treatment period.
  • the spatial frame may include first and second rings, platforms, frames, bases, etc. (terms used interchangeably herein without the intent to limit or distinguish) intercoupled by a plurality of struts.
  • the struts have adjustable lengths that may be manually adjusted regularly (e.g., daily) in accordance with a prescription or treatment plan (terms used interchangeably herein without the intent to limit or distinguish).
  • a prescription or treatment plan (terms used interchangeably herein without the intent to limit or distinguish).
  • the treatment plan specifies strut length adjustments to be made to each of the struts over time to ensure successful bone alignment.
  • TAYLOR SPATIAL FRAME® manufactured and sold by Smith Nephew, Inc.
  • the TAYLOR SPATIAL FRAME® is based on the general concept of a Stewart platform.
  • Smith & Nephew, Inc. is the owner of U.S. Patent Nos. 5,702,389; 5,728,095; 5,891,143; RE40,914, 5,971,984; 6,030,386; and 6,129,727; and U.S. Published Patent Application Nos. 20030191466; 2004/0073211; 2005/0215997; and 2016/0092651 that disclose many concepts of and improvements to the Stewart platform based spatial frame, including methods of use, systems, and devices that enhance use of the spatial frame.
  • the treatment plan may require multiple daily adjustments to be made to each of the plurality of struts.
  • a patient may be required to manually adjust one or more of the struts, typically two or more times each day, and often over long periods of time with support from either a family member, a clinician, or both.
  • compliance with the treatment plan may be burdensome, painful, and prone to errors, which may rise as the number of manual daily adjustment increases.
  • the number of adjustments dictated by the treatment plan may be limited.
  • treatment plans often limit the required number of daily adjustments to each of the plurality of struts to four per day.
  • this may equate to approximately 720 adjustments (e.g., turns) over a one-month treatment span (e.g., 6 struts x 4 adjustments per day x 30 days).
  • this may equate to approximately 2,160 adjustments (e.g., turns) over a three-month treatment span (e.g., 6 struts x 4 adjustments per day x 90 days).
  • the patient may require numerous clinical visits to confirm proper strut adjustments to ensure compliance and avoid incorrect adjustment, which has historically been the leading cause of treatment failure.
  • Motorized and/or automated spatial frames could provide numerous advantages over manually adjustable struts.
  • electric motors, motor-drive units, and a control unit e.g., a central control unit
  • a control unit e.g., a central control unit
  • an automated and/or motorized system could eliminate the need for patient compliance and decrease the frequency of postoperative visits for patient supervision given that the spatial frame only has to be activated at the start of the distraction phase and terminated at the end of the distraction phase without any patient intervention.
  • the burden of manual adjustment can be overcome by automating and/or motorizing the struts, which in turn, enables a more independent lifestyle during treatment.
  • automated and/or motorized spatial frames allow the implementation of more diverse treatment schedules.
  • automatic distraction could enable a higher distraction frequency and result in smaller excursions per activation.
  • Smaller excursions or adjustments have the potential to result in less damage to the distracted tissues, improving bone regeneration and adaptation of the surrounding soft tissues.
  • spatial frames equipped with motorized struts offer the potential to increase the number of daily distraction adjustments by enabling finer (e.g., smaller) adjustments at a controllable rate and frequency of distraction that encourages better quality bone formation.
  • Making finer (e.g., smaller) adjustments during limb lengthening can have significant advantages in terms of reduced soft tissue damage, less pain, and opioid usage and accelerated bone healing.
  • the bone fixation index was only 5-6 days/cm when using motorized and/or automated distraction compared to 22-24 days/cm by manual adjustment.
  • a motorized strut could be programmed to perform anywhere from one adjustment per day to continuous adjustments. Finer adjustments could increase the number of adjustments over a one-month period from approximately 720 adjustments to approximately 3,600 adjustments (e.g., 6 struts x 20 adjustments per day x 30 days). Alternatively, finer adjustments could increase the number of adjustments over a one-month period to approximately 259,200 adjustments (e.g., 6 struts x 1440 adjustments per day x 30 days). Over an extended three-month treatment period, this could increase the number of adjustments from approximately 2,160 adjustments to approximately 10,800 adjustments (e.g., 6 struts x 20 adjustments per day x 90 days).
  • finer adjustments could increase the number of adjustments over a three- month period to approximately 777,600 adjustments (e.g., 6 struts x 1440 adjustments per day x 90 days).
  • automated and/or motorized spatial frames face a number of challenges that need to be overcome.
  • the automated and/or motorized spatial frame needs to provide (a) sufficient power to the individual struts in order for them to carry out the required adjustments on a daily basis over the treatment period and (b) needed data connections to the struts, while reducing the overall bulkiness (e.g., size and weight) of the spatial frame and motorized struts so that the spatial frame can be effectively worn by the patient during the treatment period.
  • the motorized struts it would be advantageous for the motorized struts to be selectively configured to include first and second modes of operation.
  • a first mode of operation during, for example, initial setup (e.g., construction, assembly, and/or attachment) of the spatial frame to the patient’s bone (e.g., leg), it would be beneficial to enable the motorized strut to be manually adjustable to enable quicker or faster lengthening or shortening of the motorized struts (e.g., to allow the surgeon to freely telescope the motorized struts to quickly adjust the length of the motorized struts without requiring actuation of the motor, which is designed and configured for smaller and slower adjustments).
  • the motorized struts can be transitioned to a second mode of operation, wherein actuation of the struts is performed by the motor in order to make discrete, incremental adjustments of the overall length of the strut during, for example, the distraction phase according to the prescription plan.
  • a motorized strut arranged and configured to be used in a spatial frame is disclosed.
  • a motorized spatial frame including a first platform, a second platform, and a plurality of motorized struts coupled to the first and second platforms.
  • movement of the motorized struts move the first and second platforms, and hence the first and second bone portions coupled thereto (e.g., each of the plurality of motorized struts is configured to extend and retract in response to an electrical signal to move the first and second platforms relative to each other).
  • the motorized struts may include an outer body, an inner body, a threaded rod (e.g., a lead screw), a motor, and an adjustment mechanism arranged and configured to enable the motorized strut to be transitioned between first and second modes of operation.
  • the motorized strut In the first mode of operation, the motorized strut is arranged and configured so that actuation of the motor is not required to move, translate, etc. the inner body relative to the outer body to adjust an overall length of the motorized strut.
  • actuation of the motor is required to move, translate, etc. the inner body relative to the outer body to adjust the overall length of the motorized strut.
  • the inner body in the first mode of operation, can be manually adjusted to adjust the overall length of the motorized strut (e.g., the inner body is manually adjustable relative to the outer body to adjust the overall length of the motorized strut).
  • the inner body includes internal threads arranged and configured to threadably engage the externally threaded rod.
  • the inner body is keyed to the outer body so that rotation of the inner body is prevented relative to the outer body.
  • the adjustment mechanism includes one or more set screws extending through the outer body and into contact with one or more keyways or grooves formed in an outer surface of the inner body.
  • the motorized strut is arranged and configured in the second mode of operation so that actuation of the motor rotates the threaded rod, which rotates within the inner body, which causes the inner body to translate relative to the outer body.
  • the motorized strut In use, removal of the set screws so that they no longer contact the key ways formed in the inner body, transitions the motorized strut to the first mode of operation.
  • the inner body In the first mode of operation, the inner body can be manually rotated relative to the threaded rod to translate the inner body relative to the outer body.
  • the inner body includes internal threads arranged and configured to threadably engage the externally threaded rod.
  • the inner body is keyed to the outer body so that rotation of the inner body is prevented relative to the outer body.
  • the adjustment mechanism includes one or more spring-loaded mechanisms or levers for transitioning the motorized strut between the first and second modes of operation.
  • the spring-loaded mechanisms or levers include a plunger arranged and configured to contact one or more keyways formed in an outer surface of the inner body.
  • the spring-loaded mechanisms or levers are biased into contact with the keyways so that the motorized strut is biased into the second mode of operation.
  • depressing the spring-loaded mechanisms or levers disengage the plunger from the keyway so that the motorized strut is transitioned to the first mode of operation wherein the inner body is manually rotatable relative to the threaded rod to adjust the overall length of the strut.
  • the adjustment mechanism is arranged and configured to decouple the outer body and/or the inner body from the threaded rod so that, in the first mode of operation, the inner body is freely translatable relative to the outer body to adjust the overall length of the strut.
  • the inner body and the outer body are devoid of internal threads.
  • the inner body and the outer body are not threadably coupled to the threaded rod.
  • the inner body includes one or more windows or openings formed therein.
  • the motorized strut includes one or more jaw members positioned within the windows or openings.
  • the jaw members include internal threads for engaging with the threaded rod.
  • the jaw members include a spring arranged and configured to bias the jaw members into engagement with the threaded rod.
  • the jaw members include a spring arranged and configured to bias the jaw members away from (e.g., out of engagement with) the threaded rod.
  • depressing the jaw members causes the internal threads formed on the jaw members to engage the threaded rod to transition the motorized strut into the second mode of operation wherein actuation of the motor is required to translate the inner body relative to the outer body to adjust an overall length of the motorized strut.
  • releasing the jaw members causes the internal threads on the jaw members to disengage from the threaded rod to transition the motorized strut to the first mode of operation so that the inner body can be freely translated relative to the outer body to adjust the overall length of the motorized strut.
  • the adjustment mechanism further includes a lockout mechanism to inhibit unintentional depressing of the jaw members.
  • the lockout mechanism includes a rotating lockout sleeve rotatable between first and second positions. In the second position, the lockout sleeve is arranged and configured to enable the jaw members to extend outward away from the threaded rod so that the internal threads formed on the jaw members are disengaged from the threaded rod. In the first position, the lockout sleeve compresses the jaw members inwards towards the threaded rod so that the internal threads formed on the jaw members engage the threaded rod. [0033] In any preceding or subsequent example, the jaw members are operatively coupled to the inner body so that movement of the inner body and the jaw members occurs in unison.
  • a method for using a motorized spatial frame including positioning a plurality of motorized struts into a first mode of operation, manually adjusting an overall length of the plurality of motorized struts, transiting the plurality of motorized struts into a second mode of operation, and actuating the motors to adjust the overall length of the plurality of motorized struts.
  • Example embodiments of the present disclosure provide numerous advantages. For example, providing a motorized strut including first and second modes of operation, a surgeon can transition the motorized strut to the first mode of operation, to enable the surgeon to manually adjust the overall length of the motorized strut.
  • the first mode of operation can be particularly useful as an intraoperative tool for reducing fractures during trauma surgery or pre-setting the motorized struts to desirable positions in a more efficient manner.
  • the surgeon can transition the motorized struts to their second mode of operation, wherein the overall length of the struts can be adjusted using the built-in motor, which provides slower, more precise control.
  • the second mode of operation can be particularly useful during the correction phase of the treatment plan.
  • FIG. 1 illustrates a perspective view of a conventional spatial frame
  • FIG. 2 illustrates a cross-sectional view of an example embodiment of a motorized strut that may be used in a spatial frame in accordance with one or more features of the present disclosure
  • FIG. 3 illustrates a perspective view of an example embodiment of a motorized spatial frame including a Smart Ring (e.g., an integrated control unit and power supply) in accordance with one or more features of the present disclosure;
  • a Smart Ring e.g., an integrated control unit and power supply
  • FIGS. 4A and 4B illustrate various views of a motorized strut including first and second modes of operation in accordance with one or more features of the present disclosure, FIG. 4A schematically illustrating the first mode of operation, FIG. 4B schematically illustrating the first mode of operation, FIG.
  • FIG. 5 illustrates a first example embodiment of a motorized strut including first and second modes of operation in accordance with one or more features of the present disclosure
  • FIG. 6 illustrates a second example embodiment of a motorized strut including first and second modes of operation in accordance with one or more features of the present disclosure
  • FIGS. 7A-7E illustrate various views of a third example embodiment of a motorized strut including first and second modes of operation in accordance with one or more features of the present disclosure
  • FIGS. 7F-7J illustrate various views of a lockout mechanism that may be used in connection with the motorized strut shown in FIGS. 7A-7E in accordance with one or more features of the present disclosure
  • FIGS. 7K-7N illustrate various views of an alternate lockout mechanism that may be used in connection with the motorized strut shown in FIGS. 7A-7E in accordance with one or more features of the present disclosure
  • FIGS. 8A-8D illustrate various views of a fourth example embodiment of a motorized strut including first and second modes of operation in accordance with one or more features of the present disclosure
  • FIGS. 9A and 9B illustrate various views of a fifth example embodiment of a motorized strut including first and second modes of operation in accordance with one or more features of the present disclosure
  • FIGS. 10A-10E illustrate various views of a sixth example embodiment of a motorized strut including first and second modes of operation in accordance with one or more features of the present disclosure.
  • motorized strut including and/or being operatively associated with an adjustment mechanism to enable first and second modes of operation to facilitate faster and/or manual adjustment during, for example, initial construction of a spatial frame
  • motorized struts as disclosed herein may be embodied in many different forms and may selectively include one or more concepts, features, or functions described herein. As such, the motorized strut should not be construed as being limited to the specific examples set forth herein. Rather, these examples are provided so that this disclosure will convey certain features of the motorized strut to those skilled in the art.
  • the motorized strut is arranged and configured to be used in a spatial frame.
  • the spatial frame includes a plurality of motorized struts coupled to first and second platforms.
  • movement of the motorized struts move the first and second platforms, and hence the first and second bone portions coupled thereto.
  • the motorized strut is arranged and configured to be transitioned between first and second modes of operation.
  • the motorized strut In the first mode of operation, the motorized strut is arranged and configured so that actuation of the motor is not required to move, translate, etc. an inner body of the motorized strut relative to an outer body of the motorized strut to adjust an overall length of the motorized strut.
  • the inner body and/or threaded rod can be manually adjusted to adjust the overall length of the motorized strut.
  • a surgeon can quickly, and more efficiently, manually adjust the plurality of motorized struts to their initial length during initial construction of the spatial frame (e.g., in the first mode of operation, or quick manual adjustment mode, the surgeon can freely move or adjust the overall lengths of the motorized struts without actuation of the motors, which is useful during, for example, fracture reduction during trauma surgery or initially pre-setting the motorized struts to desirable positions).
  • the motorized struts may be transitioned to their second mode of operation wherein actuation of the motor is required to move, translate, etc. the inner body relative to the outer body to adjust the overall length of the motorized strut.
  • the threaded rod can be adjusted by actuation of the motor to adjust the overall length of the motorized strut.
  • a patient or caregiver can actuate the motor to more precisely control and adjust the overall length of the plurality of motorized struts (e.g., in the second mode of operation, or motorized adjustment mode, the motorized struts are arranged and configured to move more slowly and more precisely so that, for example, during the correction phase, precise adjustments can be made to the overall lengths of the motorized struts).
  • FIG. 1 illustrates an example embodiment of a bone alignment device such as, for example, an external fixation system, a spatial frame, a hexapod, etc. 100 (terms used interchangeably herein without the intent to limit or distinguish).
  • the spatial frame 100 may form a hexapod having a circular, metal frame with a first platform 102 and a second platform 104 connected by six adjustable length struts 106 (labeled as struts 106-1 through 106-6 in FIG. 1).
  • Each strut 106 may be independently lengthened or shortened relative to the rest of the frame, thereby allowing for six different axes of movement.
  • Each strut 106 may include an outer body and an inner body, which may be configured as, or be operatively coupled to, a threaded rod or lead screw(terms used interchangeably without the intent to limit or distinguish).
  • the outer body may be coupled to one of the platforms, such as, the second platform 104 by way of a joint as shown.
  • the inner body may be coupled to the other platform, such as, the first platform 102 by way of a joint as shown.
  • the outer body and the inner body may be moved or translated relative to one another.
  • the strut 106 may include an adjustment nut wherein rotation of the adjustment nut moves the inner body (e.g., lead screw) relative to the outer body to adjust an overall length of the strut.
  • the spatial frame 100 may be used to treat a variety of skeletal fractures of a patient.
  • the spatial frame 100 is positioned around the patient’s bone portions and is used to align two or more bone portions.
  • a length of each strut 106 may be incrementally adjusted (e.g., shortened or lengthened) in accordance with a treatment plan that specifies adjustments to be made to each strut 106 over time to ensure successful bone alignment.
  • the length of each strut 106 should be adjusted daily to comply with the provided treatment plan. Adjusting the length of each strut 106 adjusts the distance between the first and second platforms 102, 104, and hence the first and second bone portions coupled thereto.
  • each strut 106 may include a motor and may be used in a spatial frame such as, for example, spatial frame 100 to move the first and second platforms 102, 104, respectively, to align two or more bones.
  • the spatial frame and/or system architectural may be arranged and configured to automatically adjust the motorized struts according to the prescribed treatment plan (e.g., automatically adjust the plurality of motorized struts without patient intervention - manual adjustments of each of the plurality of struts is not required).
  • the spatial frame and/or system architecture may be arranged and configured to require patient and/or caregiver activation to begin the process of automatically adjusting the motorized struts according to the prescribed treatment plan.
  • the spatial frame may be arranged to intermittently auto-adjust the motorized struts at predetermined times according to the treatment plan.
  • the spatial frame may be arranged to intermittently auto-adjust the motorized struts at select times when convenient and/or selected by the patient.
  • the spatial frame may be arranged and configured to continuously auto-adjust the motorized struts in small discrete increments. In either event, by providing an automated, auto-adjusting spatial frame (e.g., a motorized, auto-adjusting spatial frame), the motorized struts may be adjusted in higher frequency, smaller discrete increments thereby facilitating clinical advantageous as previously discussed.
  • an automated, auto-adjusting spatial frame e.g., a motorized, auto-adjusting spatial frame
  • the spatial frame in accordance with the present disclosure may include, first and second platforms, a plurality of motorized struts coupled to the first and second platforms, and a control unit arranged and configured to communicate with the motorized struts.
  • the control unit may be arranged and configured to supply power to the motorized struts and to exchange (e.g., receive and/or transmit) data with the motorized struts.
  • the motorized strut 200 may be coupled to first and second platforms in a spatial frame.
  • the motorized strut 200 may be used in place of the manually adjustable struts 106 shown in FIG. 1.
  • the motorized strut 200 may include an outer body 202 operatively coupled with a first joint 204 for coupling to a first platform, an inner body 210 operatively coupled with a second joint 212 for coupling to a second platform, and a drive mechanism, actuator, etc. 220 (terms used interchangeably herein without the intent to limit or distinguish).
  • actuation of the drive mechanism 220 moves the inner body 210 relative to the outer body 202 to adjust a length of the motorized strut 200.
  • the first and second joints 204, 212 may have any suitable configuration now known or hereafter developed such as, for example, shoulder bolts, U-joints, etc.
  • the first and second joints 204, 212 are arranged and configured to couple the motorized struts to the platforms at predefined locations as will be appreciated by one of ordinary skill in the art.
  • the drive mechanism 220 may include a motor 222 and a lead screw 224 arranged and configured so that, in use, actuation of the motor 222 rotates the lead screw 224, which moves the inner body 210 relative to the outer body 202 to adjust an overall length of the motorized strut 200.
  • the drive mechanism 220 may include one or more gears to adjust speed and torque of the motor 222.
  • the motorized strut 200 may include any required circuity.
  • each motorized strut 200 may include a control circuit that controls the motor speed and direction according to the treatment plan.
  • a motor control circuit may also provide hardware and software protections that prevent any deviation from the treatment plan and alert the patient in the event of a malfunction.
  • the motorized strut 200 may include one or more position sensors to, for example, monitor absolute position or length of the strut 200.
  • the motorized strut 200 may include other sensors for monitoring various biomechanical parameters such as, for example, a force sensor 230 for monitoring stresses and forces, across the bone gap and/or the soft tissues (muscle, apposing cartilage or peripheral sensory nerves), an accelerometer for capturing patient ambulation data (steps, distance, speed and cadence), a gyroscope for measuring the degree of alignment between the bone fragments, a sensor motor support 232, etc.
  • the motorized strut 200 may include an encoder such as, for example, a rotary encoder for measuring rotation of the motor 222 for accurate positioning and motion control.
  • the motorized strut 200 may include memory for storing unique identifiers (e.g., addresses) and for storing current position, biomechanical and ambulatory data, etc.
  • the motorized struts 200 are arranged and configured to receive power and to exchange data with the control unit (e.g., PCB modules).
  • the motorized struts 200 may be operatively coupled to the control unit via, for example, a hardwired connection, although it is envisioned that the motorized struts may receive power and/or exchange data with the control unit by any other suitable mechanism now known or hereafter developed including, for example, wireless power and/or data transmission.
  • the motorized struts 200 may be arranged and configured to be operatively coupled to the control unit for receiving power, exchanging data, or a combination thereof.
  • the motorized struts 200 need not incorporate individual power supplies (e.g., a battery, etc. as such each motorized strut 200 may be battery-less or devoid of any power supply), although it is envisioned that the motorized struts may incorporate a power supply unit (e.g., battery).
  • a battery-less motorized strut design and manufacture of the motorized struts is simplified thereby minimizing, or at least reducing, strut complexity and thus likelihood that individual struts will fail.
  • the motorized struts 200 may include a communications interface for coupling to the control unit.
  • the communication interface may be used to exchange data with the control unit and/or to receive power from the control unit.
  • the communication interface may be any suitable interface now known or hereafter developed.
  • the communication interface may be configured to exchange data over a wired connection.
  • the struts 200 may be coupled to the PCB modules via one or more pogo pin connector and socket assemblies.
  • the communication interface may be configured to exchange data over a wireless connection.
  • the motorized struts 200 may be waterproofed to facilitate the patient, for example, taking a shower or bath.
  • bellows may be coupled to the ends of the motorized struts or the individual external housing components of the motorized strut may be sealed with O-rings.
  • the motorized struts and/or the spatial frame may be covered by, for example, a bag during a shower thus alleviating the necessity for water-proofing each of the motorized struts.
  • the spatial frame and corresponding system architectural according to the present disclosure may be used with any suitable motorized strut now known or hereafter developed.
  • the present disclosure should not be limited to the details of the motorized strut disclosed and illustrated herein unless specifically claimed. Rather, it should be understood that any suitable motorized strut may be used in connection with the principles of the present disclosure.
  • the motorized spatial frame 300 includes a first platform such as, for example, first platform 102, a second platform such as, for example, second platform 104, and a plurality of motorized struts such as, for example, motorized struts 200, coupled to the first and second platforms 102, 104.
  • the motorized spatial frame 300 may include a control unit.
  • the control unit may be arranged and configured to: (i) supply power to the motorized struts 200; (ii) exchange (e.g., receive and/or transmit) data with the motorized struts 200 such as, for example, exchange positional data and/or instructions with the motorized struts 200; (iii) control each of the motors of the motorized struts 200 for which it is responsible; and (iv) store and update current positional data associated with each of the motorized struts 200.
  • the control unit may be arranged and configured to communicate with an external computing system to, for example, receive spatial frame treatment plans and/or updates.
  • the control unit may communicate with the external computing system via any suitable mechanism now known or hereafter developed. For example, via a wired network or connection, such as a USB connection, via wireless communication or a wireless network.
  • the control unit may include a communication transceiver for communicating with the external computing system.
  • the control unit and the external computing system are communicatively coupled to exchange data such as, for example, treatment plan information, updates, strut positional data, etc.
  • the control unit can supply power to the motorized struts 200 and convert the treatment plan into instructions to control each of the motorized struts 200.
  • the external computing system may connect to the control unit to control the plurality of motorized struts 200.
  • the motorized struts 200 may move individually (e.g., sequentially) or simultaneously according to the treatment plan.
  • the control unit may periodically supply real time actuation data and/or updates to the external computing system thereby conforming compliance with the treatment plan.
  • the external computing system may be any suitable external computing system now known or hereafter developed including, for example, a desktop computer residing, for example, in a surgeon’s office, a laptop, an APP running on a smartphone, a tablet, etc., or combinations thereof.
  • the communication transceiver may be any suitable communication interface now known or hereafter developed including, for example, wired and wireless transceivers.
  • the communication interface may be a wireless communication transceiver for wirelessly communicating with the external computing system.
  • control unit may be arranged and configured to exchange data such as, for example, a treatment plan, with the external computing system and to exchange data such as, for example, adjustment instructions, with the plurality of motorized struts 200.
  • control unit may be arranged and configured to deliver power to the plurality of motorized struts 200.
  • control unit may be arranged and configured to control and/or power the plurality of motorized struts 200.
  • the control unit may be in the form of one or more PCB modules 310 positioned in the spaces or pockets 109 formed in the platform (illustrated as platform 104), the spaces or pockets 109 located between the laterally extending adjacent tabs 108 on, for example, an existing platform.
  • the controlling electronics may be embedded within the spaces or pockets 109 between the tabs 108.
  • the platform and the PCB modules 310 may be referred to as a Smart Ring 320.
  • the Smart Ring 320 may be interpreted to encompass the platform 104 and the control unit inclusive of the plurality of PCB modules 310 including any necessary power supply units and integrated connectivity.
  • the Smart Ring 320 is designed to control the movements and manage the power requirements of the motorized struts such as, for example, motorized struts 200. That is, for example, the Smart Ring 320 is arranged and configured as centralized controllers to control each of the plurality of motorized struts 200. Thus arranged, in some example embodiments, the Smart Ring 320 may be arranged and configured to substantially match the existing profile of a standard platform while providing or incorporating one or more control units and integrated power supplies arranged and configured to provide localized intelligence to supply data and/or power to each of the plurality of motorized struts 200.
  • the Smart Ring 320 includes any circuity necessary to control actuation of the motorized struts 200.
  • the Smart Ring 320 includes one or more processors, controllers, or the like for implementing the treatment plan (e.g., controlling / providing data such as, for example, adjustment instructions to each of the motorized struts 200).
  • the Smart Ring 320 may include memory for storing information such as, for example, treatment plan information, strut information including unique identifiers or addresses for each of the motorized struts, target strut length for each of the motorized struts, absolute strut length for each of the motorized struts, lengthening direction for each of the motorized struts, rate of distraction for each of the motorized struts, rhythm and/or timing of distraction for each of the motorized struts, total amount of distraction for each of the motorized struts, lengthening schedule, number of motor turns, force exerted, etc.
  • the Smart Ring 320 may include memory for storing information such as, for example, treatment plan information, strut information including unique identifiers or addresses for each of the motorized struts, target strut length for each of the motorized struts, absolute strut length for each of the motorized struts, lengthening direction for each of the motorized struts, rate of distraction for
  • Ring 320 may include a real-time clock.
  • the control unit may be provided as a plurality of separate and distinct PCB modules 310.
  • the control unit may include three separate PCB modules 310, although alternate configurations are envisioned including, for example, more or less PCB modules such as one, two, four, or more.
  • Each PCB module 310 may be coupled to the platform of the motorized spatial frame 300.
  • the PCB modules 310 control the movement of the motorized struts 200.
  • each PCB module 310 may be responsible for controlling two motorized struts 200 (e.g., each PCB module 310 may include the needed circuity, power, and connectivity to control two (2) motorized struts 200).
  • each PCB module 310 may be independently powered and operated as a stand-alone system.
  • each of the PCB modules 310 may communicated with the other PCB modules 310 wirelessly such as, for example, by Bluetooth Low Energy (BLE) or the like.
  • BLE Bluetooth Low Energy
  • each of the PCB modules 310 may communicated with the other PCB modules 310 via a wired connection.
  • each PCB module 310 may include a PCB board and a battery board coupled to each other via a connector.
  • electrical connection between the PCB board and the battery board in each PCB module 310 across the tabs 108 in the platform may be achieved using a flexi/flex-rigid PCB connector positioned in a narrow trench or groove formed in the platform.
  • a groove or recess may be provided in an arc in the perimeter of the platform to accommodate the flex rigid PCB connector.
  • the PCB board may include, for example, the microcontroller and associated electronics.
  • the battery board may include the power supply and associated electronics.
  • each battery board may include a plurality of coin cell batteries such as, for example, 3-coin cells, although this is but one configuration and other numbers and types of batteries may be utilized.
  • the Smart Ring 320 includes communication interfaces for communicating with the motorized struts 200.
  • the Smart Ring 320 may incorporate integrated connectivity to enable connection to the motorized struts 200.
  • a wire loom or cable arranged and configured to provide data and/or power to the motorized struts 200 may be provided.
  • the wire loom or cable may be arranged and configured with local terminations or connectors for exchanging data and providing power to the motorized struts 200.
  • the connectors may be any suitable connector arranged and configured to enable power and/or data transfer between the motorized struts 200 and the Smart Ring 320 including, for example, jack plugs and sockets, a header connector, pogo pin connectors and socket assemblies at each of the six tabs 108 formed on the platform, etc.
  • the Smart Ring 320 may include a second communication interface for communicating with the external computing system and, in connection with preferred embodiments where the Smart Ring includes three- separate and distinct PCB modules 310, a communication interface so that each PCB module can communicate with the other PCB modules.
  • the Smart Ring may be arranged and configured to synchronize movements of the motorized struts 200.
  • the Smart Ring 320 may be arranged and configured to control each motorized strut 200 simultaneously or individually.
  • the Smart Ring 320 may be arranged and configured to control each motorized strut 200 sequentially (e.g., the Smart Ring 320 may be arranged and configured to control (adjust) each of the motorized struts 200 sequentially (e.g., one at a time), or in any combination thereof).
  • the motorized struts 200 may be arranged and configured to transmit data to the Smart Ring 320.
  • the motorized struts 200 may include one or more sensors for transmitting data pertaining to strut position, forces acting upon the motorized struts 200, motor temperature, motor current, etc. to the Smart Ring 320.
  • the Smart Ring 320 including the PCB modules 310 may be hermetically sealed using any suitable method and/or material now known or hereafter developed such as, for example, a press-fit plastic or metal lid or a biocompatible potting compound (e.g., medical grade epoxy, silicone elastomer, polyurethane material, etc.).
  • a press-fit plastic or metal lid or a biocompatible potting compound (e.g., medical grade epoxy, silicone elastomer, polyurethane material, etc.).
  • the pockets or spaces 109 may be overmoulded to encapsulate the electronics (e.g., PCB modules 310).
  • control unit may be arranged and configured to be coupled to one of the platforms 102, 104.
  • the control unit may include one or more power supplies (e.g., a plurality of coin cells), one or more micro-controllers, and connectors (e.g., pin pogo connectors) to provide power and positional control to the motorized struts 200.
  • power supplies e.g., a plurality of coin cells
  • micro-controllers e.g., a plurality of coin cells
  • connectors e.g., pin pogo connectors
  • control unit e.g., PCB modules 310) may be coupled to the spatial frame (e.g., platform 102, 104) via any suitable mechanism now known or hereafter developed.
  • control unit e.g., PCB modules 310) may be detachably coupled to the platforms 102, 104.
  • control unit e.g., PCB modules 310) are arranged and configured to be coupled to the platforms 102, 104 using one or more quick-coupling mechanical fasteners.
  • FIGS. 4A and 4B a motorized strut 400 including first and second modes of operation is illustrated.
  • FIG. 4A schematically illustrating the first mode of operation.
  • FIG. 4B schematically illustrating the second mode of operation.
  • the motorized strut 400 includes an inner body 410, an outer body 420, a threaded rod 430 (also referred to herein as a lead screw), a motor, and an adjustment mechanism 450.
  • the adjustment mechanism 450 is arranged and configured to transition the motorized strut 400 between the first and second modes of operation.
  • the motorized strut 400 is arranged and configured so that actuation of the motor such as, for example, motor 222 is not required to move, translate, etc. the inner body 410 and/or threaded rod 430 to adjust an overall length of the motorized strut 400.
  • the inner body 410 can be manually or freely adjustable relative to the outer body 420 to adjust the overall length of the motorized strut 400.
  • a surgeon can quickly, and more efficiently, manually adjust the plurality of motorized struts to their initial length during initial construction of the spatial frame (e.g., in the first mode of operation, or quick manual adjustment mode, the surgeon can freely move or adjust the overall lengths of the motorized struts without actuation of the motors).
  • the motorized struts 400 may be transitioned to their second mode of operation wherein actuation of the motor to adjust the overall length of the motorized strut 400 is required.
  • a patient or caregiver can actuate the motor to more precisely control and adjust the overall length of the plurality of motorized struts (e.g., in the second mode of operation, or motorized adjustment mode, the motorized struts are arranged and configured to move more slowly and more precisely so that, for example, during the correction phase, precise adjustments can be made to the overall lengths of the motorized struts).
  • the inner body 410 includes internal threads arranged and configured to threadably engage the threaded rod (e.g., externally threaded lead screw) 430.
  • the lead screw 430 is coupled to the motor.
  • the inner body 410 is keyed to the outer body 420. That is, the inner body 410 is coupled to the outer body 420 via an anti-rotational mechanism.
  • actuation of the motor rotates the lead screw 430, which rotates the inner body 410 to adjust the length or position of the inner body 410 relative to the outer body 420.
  • the inner body 410 can be keyed to the outer body 420 by any suitable mechanism now known or hereafter developed.
  • the inner body 410 may include one or more key ways 412 formed in an outer surface thereof.
  • the outer body 420 may include one or more set screws 422 arranged and configured to interact with the key ways 412 formed in the inner body 410.
  • actuation of the motor rotates the lead screw 430, which rotates the inner body 410, which due to the keyed engagement, causes the inner body 410 to translate relative to the outer body 420.
  • the anti-rotational mechanism/keyways may be provided in any suitable form now known or hereafter developed such as, for example, shape of the keyway could vary between a male or female, V-shaped, radiused, flat, etc.
  • shape of the keyway could vary between a male or female, V-shaped, radiused, flat, etc.
  • the inner body could be non-cylindrical with one or more flat surfaces.
  • the motorized strut 400 is transitioned to the first mode of operation, wherein the inner body 410 can be manually rotated relative to the lead screw 430 to translate the inner body 410 relative to the outer body 420 to facilitate quicker adjustment of the overall length of the motorized strut 400. That is, in use, by keying the inner body 410 to the outer body 420, the user can disengage the key (e.g., anti-rotational mechanism) thus allowing manual rotation of the inner body 410 about the lead screw 430, which remains stationary.
  • the key e.g., anti-rotational mechanism
  • the set screw 422 and key ways 412 act as the adjustment mechanism 450 for transitioning the motorized strut 400 between the first and second modes of operation.
  • the motorized strut 400 may also include a gasket 460 to prevent water, etc. from entering into the outer body 420.
  • the gasket 460 may be provided in any suitable form now known or hereafter developed.
  • the outer body 420 may include a threaded end cap, the gasket 460 can be positioned between the outer body 420 and the inner body 410 to maintain, for example, IP67 protection.
  • the motorized strut 400 may include one or more stops 470 to prevent undesirable decoupling of the inner body 410 from the lead screw 430.
  • the stops 470 can be provided in any suitable form now known or hereafter developed.
  • the stops 470 may be arranged and configured as raised features positioned at the end of the lead screw 430 and/or inner body 410 to ensure that the inner body 410 cannot be threaded too far and eventually disengaged from the lead screw 430.
  • the adjustment mechanism 450 may be provided in alternate forms.
  • the set screws 422 can be replaced with one or more spring-loaded levers that could be quickly disengaged by the surgeon.
  • the adjustment mechanism 450 could be provided in the form of slip/press fit pins or a spring-loaded mechanism 452 allowing engagement/disengagement of the key way through the outer body 420.
  • the spring- loaded mechanism 452 includes a projection, a plunger, etc. arranged and configured to contact, interact with, etc. the keyways 412 formed in the outer surface of the inner body 410.
  • the spring-loaded mechanism 452 may be arranged and configured to be biased into contact with the key ways 412 so that the motorized strut 400 is biased into the second mode of operation. However, during, for example, initial construction of the spatial frame, the surgeon may depress the spring-loaded mechanism 452 to disengage the plunger from the key way 412 so that the motorized strut 400 is transitioned to the first mode of operation wherein the inner body 410 can be manually rotated relative to the lead screw 430, which remains stationary. As such, in connection with this example embodiment, the spring-loaded mechanism 452 and key ways 412 act as the adjustment mechanism 450 for transitioning the motorized strut 400 between the first and second modes of operation.
  • the motorized strut 500 includes an inner body 510, an outer body 520, a threaded rod 530 (also referred to herein as a lead screw), a motor, and an adjustment mechanism 550.
  • the adjustment mechanism 550 is arranged and configured to decouple the inner body 510 from the externally threaded rod or lead screw 530.
  • the internal threads associated with the inner body 510 may be completely disengaged from the externally threaded lead screw 530 so that free translation of the inner body 510 relative to the outer body 520 is enabled.
  • the inner body 510 no longer needs to be rotated in the first mode of operation. Rather, the inner body 510 can be purely translated relative to the outer body 520 to adjust the overall length of the motorized strut 500.
  • the inner body 510 and the outer body 520 may be devoid of any internal threads.
  • the inner body 510 and/or the outer body 530 include a window or opening 512 formed therein.
  • One or more jaw members 575 may be positioned within the windows 512 formed in the inner body 510 and/or the outer body 530. As illustrated, in some example embodiments, two diametrically opposed, spring-biased, partially threaded translating jaw members 575 may be provided, although this is but one configuration and more or less jaw members 575 may be provided. In use, the jaw members 575 are operatively coupled to the inner body 510 so that movement of the inner body 510 and the jaw members 575 occurs in unison (e.g., the jaw members 575 translate in unison with the inner body 510, the jaw members 575 move along the longitudinal axis of the threaded rod 530 together with the inner body 510).
  • the motorized strut 500 includes an anti-rotation feature to ensure that the inner body 510 and jaw members 575 can only translate relative to each other.
  • the anti-rotational feature may be any suitable featured disclosed herein or any other feature now known or hereafter developed such as, for example, the translating jaw members 575 can include protrusions that extend into a slot formed in the outer body 520.
  • the jaw members 575 include internal threads for engaging with the externally threaded lead screw 530.
  • the jaw members 575 include a spring 576, which may be arranged and configured to either bias the jaw members 575 into engagement with the externally threaded lead screw 530 or away from the externally threaded lead screw 530.
  • releasing the jaw members 575 causes the internal threads on the jaw members 575 to engage the externally threaded lead screw 530 to transition the motorized strut 500 to the second mode of operation wherein actuation of the motor is required to adjust the position of the inner body 510 relative to the outer body 520 and thus adjust the overall length of the motorized strut 500.
  • releasing the jaw members 575 causes the internal threads on the jaw members 575 to disengage from the externally threaded lead screw 530 to transition the motorized strut 500 to the first mode of operation so that the inner body 510 can be freely translated relative to the outer body 520 to adjust the overall length of the motorized strut 500.
  • the adjustment mechanism 550 preferably further includes a lockout mechanism, device, sleeve, or the like (terms used interchangeably herein without the intent to limit or distinguish) to prevent the jaw members 575 from slipping under load.
  • the lockout mechanism 580 also prevents unintentional depressing of the jaw members 575 to prevent unintentional transitioning to the first mode of operation and hence unwanted free translation of the inner body 510 relative to the outer body 520.
  • FIGS. 7F-7J an example embodiment of a lockout mechanism 580 is illustrated.
  • the lockout mechanism 580 is arranged and configured to receive the jaw members 575.
  • the lockout mechanism 580 may include a recess 582 arranged and configured to receive the protruding portions of the jaw members 575 so that the lockout mechanism 580 can move, slide, etc. about the outer body 520 and into engagement with the jaw members 575 as generally illustrated in FIG.
  • the lockout mechanism 580 may be arranged and configured to rotate relative to the outer body 520 and relative to the jaw members 575 positioned within the recess 582 formed in the lockout mechanism 580 as generally illustrated in FIG. 7G.
  • a secondary movement of the lockout mechanism 580 relative to the outer body 520 and the jaw members 575 may be utilized to prevent, or at least inhibit, unintentional transitioning of the motorized strut 500 between the first and second modes of operation (e.g., the lockout mechanism 580 can be initially translated into engagement with the jaw members 575 and then rotated relative to the jaw members 575 thereby preventing the jaw members 575 from being depressed and hence preventing the threads formed on the jaw members 575 from disengaging the threaded rod 530).
  • interconnecting projections and recesses may be used to engage the jaw members 575 to the lockout mechanism 580.
  • an optional secondary lockout mechanism 590 could be used.
  • the secondary lockout mechanism 590 is arranged and configured to be received within the remaining open spaces of the recess 582 formed in the lockout mechanism 580.
  • the secondary lockout mechanism 590 may include arms 592 arranged and configured to move, slide, etc.
  • the jaw members 575 are arranged and configured to be biased out of engagement with the externally threaded lead screw 530 so that depressing the jaw members 575 causes the internal threads formed on the jaw members 575 to engage the externally threaded lead screw 530 (e.g., designed to engage when depressed), a user can depress the two protruding portions of the jaw members 575 to transition the motorized strut 500 to the second mode of operation so that actuation of the motor is required to translate the inner body 510 relative to the outer body 520.
  • the adjustment mechanism 550 also preferably includes a lockout mechanism 580 to prevent the motorized strut 500 from unintentionally transitioning between first and second modes of operation.
  • the lockout mechanism 580 may be in the form of a rotating lockout sleeve, thus terms lockout mechanism and lockout sleeve are used interchangeably herein without the intent to limit or distinguish.
  • the protruding portions of the jaw members 575 may include an angled outer surface 583 such that when the lockout sleeve 580 is rotated from a first position (FIG. 7K) to a second position (FIG.
  • the jaw members 575 are permitted to extend outward away from the externally threaded lead screw 530 so that the internal threads formed on the jaw members 575 are disengaged from the externally threaded lead screw 530.
  • the lockout sleeve 580 is rotated to the first position (FIG. 7K)
  • the interaction between the inner surface of the lockout sleeve 580 and the outer surface of the jaw members 575 compresses the jaw members 575 inwards towards the externally threaded lead screw 530 so that the internal threads formed on the jaw members 575 engage the externally threaded lead screw 530.
  • the lockout sleeve 580 when constrained at their inner location (e.g., first position as illustrated in FIG.
  • the springs 576 would be compressed and the threads would be engaged.
  • the spring 576 When allowed to extend outward (e.g., second position as illustrated in FIG. 7L), the spring 576 would be extended and the threads would be disengaged, allowing free translation of the inner body 510.
  • the lockout sleeve 580 may be arranged and configured to only cover the jaw members 575.
  • the lockout sleeve 580 would be arranged and configured to translate along with the jaw members 575 during adjustment to the overall length of the motorized strut 500.
  • the lockout sleeve 580 could be arranged and configured to extend the length of the outer body 520, or a substantial portion thereof. In this configuration, the lockout sleeve 580 would not need to translate with the jaw members 575 when adjusted.
  • a secondary safety mechanism could also be incorporated to prevent, or at least inhibit, unintentional movement.
  • a secondary movement may be required in order to move the lockout sleeve 580 from the first position to the second position. That is, for example, similar to the example embodiment previously described, a pin and recess may be utilized. In use, initial translation followed by rotation of the lockout sleeve 580 relative to the jaw members 575 could be required to position the pin of the jaw members into the recess.
  • the motorized strut 500 is arranged and configured to prevent ingress of water, etc.
  • the electronics and optional battery contained within the motorized strut may be contained and sealed within the non-telescoping end of the strut.
  • a motorized strut 600 including first and second modes of operation is illustrated.
  • the motorized strut 600 includes a manual override feature 650 arranged and configured to enable rapid adjustment to the overall length of the motorized strut 600 (e.g., manual override feature 650 is arranged and configured to move or translate the inner body 610 of the motorized strut 600 relative to the outer body 620 of the motorized strut 600 without actuation of the motor).
  • the motorized strut 600 includes a plug 652 arranged and configured to removably engage the motorized strut 600 such as, for example, the outer body 620 of the motorized strut 600.
  • the plug 652 may be any suitable plug now known or hereafter developed to removably engage the motorized strut 600.
  • the removable plug may be in the form of a plastic bung, a set screw, or the like.
  • the plug 652 provides access to the motor pinion gear 654.
  • the user may matingly engage the motor pinion gear 654 with, for example, a tool 660.
  • the tool 660 may be any suitable tool now known or hereafter developed for engaging the motor pinion gear 654.
  • the motor pinion gear 654 may include a tooth key or gear
  • the tool 660 includes a first or distal end 662 arranged and configured to engage the motor pinion gear 654.
  • the user may rotate the tool 660 to manually rotate the motor pinion gear 654.
  • the motorized strut 600 may be transitioned to the first mode of operation to quickly adjust the overall length of the motorized strut 600.
  • the tool 660 may be disengaged from the motor pinion gear 654 and the plug 652 may be reengaged onto the motorized strut 600 so that the actuation of the motor is used to adjust the overall length of the motorized strut 600 and thereby transition the motorized strut 600 to the second mode of operation.
  • one manual or full rotation of the tool 660 may equate to approximately 40-degrees of pinion movement and approximately 0.04 mm lead screw movement (e.g., translation), although this is but one configuration and rotation of the tool may result in more or less rotation of the motor pinion gear 654 and resulting translation of the lead screw.
  • the tool 660 may include a coupler 664 such as, for example, an internal HEX coupling arranged and configured to mate with a power tool such as, for example, a powered screwdriver, a drill, etc.
  • a power tool such as, for example, a powered screwdriver, a drill, etc.
  • the power tool may be coupled to the motor pinion gear 654 via the tool 660 to enable faster adjustments.
  • the manual override feature of the motorized strut 600 provides the added benefit that adjustments can be made to the overall length of the motorized strut in the event of a motor failure.
  • the inner body 610 may be equipped with visual markings 614 to help track the movement of the strut.
  • a motorized strut 700 including first and second modes of operation is illustrated.
  • the motorized strut 700 includes an adjustment mechanism or feature arranged and configured to enable the motorized strut 700 to be adjusted (e.g., rotated) at higher speeds during, for example, initial construction.
  • the motorized strut 700 is arranged and configured to be connected to an external power source 710 such as, for example, an external motor controller and power supply, via the positive and negative motor terminals MT (e.g., motor +ve and -ve terminals) positioned on the motor 702 of the strut 700.
  • the motorized strut 700 can be connected to the external power source 710 via the motor terminals MT thereby placing the motorized strut 700 into the first mode of operation.
  • the motorized strut 700 is supplied power via the Smart Ring 320.
  • the Smart Ring 320 includes a plurality of batteries (e.g., coin cell batteries).
  • the batteries are arranged and configured to deliver a maximum mean current of approximately 100 pA.
  • the motorized struts 700 can receive approximately 100 mA (lOOOx greater than the batteries) thereby enabling the motor 702 to obtain higher speeds to adjust the overall length of the motorized strut 700.
  • the motor 702 can be driven at a higher speed.
  • the system of the present example embodiment includes an external power source 710, which includes any and all external electrical contacts.
  • remote power to the motor 702 of the motorized strut 700 could be facilitated by gaining direct access to the motor terminals MT from external electrodes placed on the external surface of the motorized strut 700.
  • the motorized strut 700 may include a pair of access nodes from the internal motor of the motorized strut 700. In use, the access nodes are arranged and configured to connect to the external power supply.
  • the internal motor 702 of the motorized strut 700 can be isolated (e.g., disconnected from the internal circuitry of the motorized strut 700).
  • the transistors and current switches are switched off. That is, for example, in some example embodiments, the external power source 710 could directly engage with the motor 702 (e.g., internal DC brushed motor) of the motorized strut 700 (e.g., when used with an internal DC brushed motor, access to the internal motor 702 of the motorized strut 700 could be achieved utilizing two external electrodes or access nodes).
  • the internal electronics and circuity of the motorized strut 700 including, for example, the capacitive charging circuit and PCB control circuitry would be isolated from the external power source 710 by, for example, isolator switches.
  • the external power source 710 would simply drive the internal motor 702 of the motorized strut 700 either forward or in reverse as desired.
  • the motorized strut 700 included a brushless motor, one or more electrodes could be used to access the internal DC brushless motor from outside of the motorized strut.
  • the access nodes protruding from the motorized strut 700 can be connected to external instruments including, for example, an external motor controller, an external power supply, and any other needed circuity to power and deliver the higher current from the external power supply to the internal motor of the motorized strut 700.
  • external instruments can be used to independently control and/or move the strut at a rate of 1 mm every 3 to 4 seconds.
  • a powered instrument could be connected to the access nodes protruding from the motorized strut 700 to supply power to the motors.
  • the motor speed of the internal DC motor of the motorized strut 700 can be modulated by controlling the input voltage to the motor using a Pulse Width Modulation (PWM) signal.
  • PWM Pulse Width Modulation
  • direction of the current flow through the motor can be inversed using an H-Bridge.
  • An H-Bridge circuit contains four switching elements, transistors or MOSFETs, with the motor at the center forming an H-like configuration. By activating two particular switches at the same time, the direction of the current flow can be changed, changing the rotation direction of the motor.
  • a motorized strut 800 including first and second modes of operation is illustrated.
  • the motorized strut 800 includes an adjustment mechanism or feature arranged and configured to enable the threaded rod or lead screw 830 of the motorized strut 800 to be decoupled from the motor 840 (e.g., internal motor of the motorized strut 800).
  • the motorized strut 800 is arranged and configured to enable manual rotation of the threaded rod 830, causing the inner body 810 to move (e.g., translate) relative to the outer body 820 at a faster rate than provided by the internal motor of the motorized strut 800.
  • the motorized strut 800 includes features/mechanisms allowing the user to manually rotate the threaded rod 830. Once the desired position or length of the motorized strut 800 is achieved, the threaded rod 830 can be recoupled to the motor 840 thereby transitioning the motorized strut 800 to the second mode of operation.
  • the outer body of the motorized strut 800 is manufactured from first and second outer bodies or housing components 820A, 820B, although this is but one configuration.
  • the first and second outer bodies 820A, 820B are selectively engageable with each other to enable the user to access the internal components of the motorized strut 800.
  • the first and second outer bodies 820A, 820B may be threadably coupled to each other, although any other suitable connection mechanism may be used.
  • the outer bodies 820A, 820B include removable aluminum tubes, which are threaded together to form a tight seal. In use, the outer bodies 820A, 820B protect the motor from axial and side impact forces and provide a waterproof seal.
  • the first and second outer bodies 820A, 820B may be disconnected from each other to provide access to the internal components as generally illustrated in FIG. 10B.
  • the motorized strut 800 includes a number of internal components including a thrust bearing 860 and an anti-rotation sleeve 865.
  • the anti-rotation sleeve 865 ensures that rotational movement from the motor 840 is translated into axial motion of the inner body 810 relative to the outer bodies 820 A, 820B.
  • the threaded rod 830 in use, with access to the internal components provided by disconnecting the first and second outer bodies 820A, 820B, the threaded rod 830 can be disengaged from the anti-rotation sleeve 865 thereby allowing the inner body 810 to freely move (e.g., freely translate).
  • the threaded rod 830 includes a coupling mechanism that enables the threaded rod 830 to be removably coupled to and decoupled from the motor 840.
  • the threaded rod 830 may include a cap screw 832 and a taper lock 834 for selectively engaging and disengaging from the motor 840, although this is but one configuration and any suitable coupling mechanism for selectively engaging and disengaging the threaded rod 830 relative to the motor 840 may be used such as, for example, a spring-loaded assembly.
  • a spring-loaded assembly such as, for example, a spring-loaded assembly.
  • conventional motorized struts wherein the motor is permanently coupled to the threaded rod via, for example, a counterbore press fit, a hollow shaft press-fit or by welding the threaded rod directly to the motor.
  • decoupling of the threaded rod from the motor is prohibited and thus manual adjust of the threaded rod in the event of a motor failure or the need to rapidly adjust the strut is also prohibited.
  • the threaded rod 830 may also include a coupling segment or flat 836 placed on the end of the threaded rod 830 opposite the coupling mechanism for engaging the motor 840.
  • the coupling segment or flat 836 can be engaged by, for example, a tool such as, for example, a torque wrench 872 to rotate the threaded rod 830.
  • the cap screw 832 can be loosened using, for example, an alley key 870, the threads disengaged, and the threaded rod 830 removed from the motor 840.
  • a motorized strut including first and second modes of operation is provided. In the first mode of operation, a surgeon can manually adjust the motorized strut to adjust the overall length of the motorized strut.
  • the first mode of operation can be particularly useful as an intraoperative tool for reducing fractures during trauma surgery or pre-setting the motorized struts to desirable positions in a more efficient manner.
  • the motorized strut relies on the built-in motor to move the inner body relative to the outer body to adjust the overall length of the strut in a slower, more precise manner.
  • the second mode of operation can be particularly useful during the correction phase.
  • any example embodiment or feature of any section, portion, or any other component shown or particularly described in relation to various example embodiments of similar sections, portions, or components herein may be interchangeably applied to any other similar example embodiment or feature shown or described herein. Additionally, components with the same name may be the same or different, and one of ordinary skill in the art would understand each component could be modified in a similar fashion or substituted to perform the same function.
  • Connection references are to be construed broadly and may include intermediate members between a collection of elements and relative to movement between elements unless otherwise indicated. As such, connection references do not necessarily infer that two elements are directly connected and in fixed relation to each other. All rotational references describe relative movement between the various elements. Identification references (e.g., primary, secondary, first, second, third, fourth, etc.) are not intended to connote importance or priority but are used to distinguish one feature from another.
  • the drawings are for purposes of illustration only and the dimensions, positions, order and relative to sizes reflected in the drawings attached hereto may vary.

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  • Biomedical Technology (AREA)
  • Engineering & Computer Science (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Medical Informatics (AREA)
  • Molecular Biology (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Accommodation For Nursing Or Treatment Tables (AREA)

Abstract

L'invention concerne une entretoise motorisée destinée à être utilisée dans un cadre spatial motorisé. L'entretoise motorisée comprend un mécanisme de réglage agencé et configuré pour permettre à l'entretoise motorisée d'être passée entre des premier et second modes de fonctionnement. Dans le premier mode de fonctionnement, l'entretoise motorisée est agencée et configurée de telle sorte que l'actionnement du moteur n'est pas nécessaire pour déplacer un corps interne de l'entretoise motorisée par rapport à un corps externe de l'entretoise motorisée pour régler une longueur totale de l'entretoise motorisée. Ainsi, dans le premier mode de fonctionnement, la longueur globale de l'entretoise peut être réglée manuellement pour faciliter un réglage de longueur plus efficace (par exemple, plus rapide). Dans le second mode de fonctionnement, l'actionnement du moteur est nécessaire pour régler la longueur totale de l'entretoise motorisée pour faciliter un réglage plus lent et plus précis de l'entretoise motorisée.
PCT/US2022/042863 2021-09-22 2022-09-08 Mécanisme de réglage rapide d'une entretoise motorisée dans un cadre spatial WO2023048948A1 (fr)

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Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4973331A (en) * 1989-03-08 1990-11-27 Autogenesis Corporation Automatic compression-distraction-torsion method and apparatus
US5702389A (en) 1995-03-01 1997-12-30 Smith & Nephew Richards, Inc. Orthopaedic fixation device
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US5891143A (en) 1997-10-20 1999-04-06 Smith & Nephew, Inc. Orthopaedic fixation plate
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