US20230380868A1 - Biasing device for spinal device - Google Patents

Biasing device for spinal device Download PDF

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Publication number
US20230380868A1
US20230380868A1 US18/447,787 US202318447787A US2023380868A1 US 20230380868 A1 US20230380868 A1 US 20230380868A1 US 202318447787 A US202318447787 A US 202318447787A US 2023380868 A1 US2023380868 A1 US 2023380868A1
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US
United States
Prior art keywords
implantable
spinal
biasing device
rod
elongated member
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
US18/447,787
Inventor
Uri Arnin
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Apifix Ltd
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Apifix Ltd
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Publication date
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Priority to US18/447,787 priority Critical patent/US20230380868A1/en
Assigned to APIFIX LTD. reassignment APIFIX LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ARNIN, URI
Publication of US20230380868A1 publication Critical patent/US20230380868A1/en
Pending legal-status Critical Current

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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
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
    • A61B17/7002—Longitudinal elements, e.g. rods
    • A61B17/7014—Longitudinal elements, e.g. rods with means for adjusting the distance between two screws or hooks
    • 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
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
    • A61B17/7002—Longitudinal elements, e.g. rods
    • A61B17/7004—Longitudinal elements, e.g. rods with a cross-section which varies along its length
    • A61B17/7007—Parts of the longitudinal elements, e.g. their ends, being specially adapted to fit around the screw or hook heads
    • 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
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
    • A61B17/7002—Longitudinal elements, e.g. rods
    • A61B17/7019—Longitudinal elements having flexible parts, or parts connected together, such that after implantation the elements can move relative to each other
    • 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
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
    • A61B17/7002—Longitudinal elements, e.g. rods
    • A61B17/7019—Longitudinal elements having flexible parts, or parts connected together, such that after implantation the elements can move relative to each other
    • A61B17/7025—Longitudinal elements having flexible parts, or parts connected together, such that after implantation the elements can move relative to each other with a sliding joint
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B2017/00367—Details of actuation of instruments, e.g. relations between pushing buttons, or the like, and activation of the tool, working tip, or the like
    • A61B2017/00407—Ratchet means
    • 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
    • A61B2017/564—Methods for bone or joint treatment
    • 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
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B2017/681—Alignment, compression, or distraction mechanisms

Definitions

  • the present invention relates generally to spinal implants and prostheses, and particularly to an add-on or integral biasing device for a spinal device, such as a spinal rod.
  • Scoliosis is a spinal deformity affecting many people.
  • Current surgical treatment involves affixing long fusion rods to the spine by pedicle screws.
  • the rod system is intended to force the deformed spine into a more healthy position.
  • U.S. patent Ser. No. 10/245,081 to Arnin describes an improved ratcheted spinal device that includes a rod that can move out of a housing. The amount the rod protrudes out of the housing can be lengthened or shortened using a ratchet mechanism. The rod can be connected to standard pedicle screws as well as to other spinal rods or spinal structure, using appropriate connectors.
  • the present invention seeks to provide an improved spinal device or accessory for a spinal device, namely an add-on or integral biasing device for a spinal device, as is described more in detail hereinbelow.
  • a spinal device including a rod which has a first end disposed in a housing and a second end which protrudes out of the housing through an aperture and which is movable to protrude more out of the housing or less out of the housing, and a biasing device, mounted on the rod, which includes a series of connected at-least partial coils, wherein a first end of the biasing device is arranged to abut against the housing and a second end of the biasing device, opposite to the first end, is affixed to the rod.
  • the at-least partial coils may include full coils, or instead, a series of connected partial coils that do not extend completely around the rod but instead subtend an angle of less than 360° and each pair of neighboring coils of the partial coils are connected by a connection member and the connection members are separated from one another by a circumferential gap.
  • a first end of the biasing device is arranged to abut against the housing and a second end of the biasing device, opposite to the first end, is provided with a fastener to affix the second end to the rod.
  • axial fixation of the second end determines a pretension of the biasing device.
  • the rod is coupled with a ratchet mechanism for controlling an amount the rod protrudes out of the housing.
  • a first polyaxial-joint attachment member is at the second end of the rod and a second polyaxial-joint attachment member is at a portion of the housing.
  • a method for adjusting curvature of a spine includes mounting a biasing device on a rod of a spinal device which is installed on spinal structure, the biasing device including a series of connected partial coils that do not extend completely around the rod but instead subtend an angle of less than 360° and each pair of neighboring coils of the partial coils are connected by a connection member and the connection members are separated from one another by a circumferential gap, and using the biasing device to apply an urging force to the rod and to the spinal structure.
  • FIG. 1 is a simplified pictorial illustration of a spinal device, constructed and operative in accordance with an embodiment of the invention
  • FIG. 2 is a simplified enlarged illustration of a biasing device of the spinal device of FIG. 1 ;
  • FIG. 3 is another simplified illustration of the biasing device, showing circumferential gaps between ends of partial coils of the biasing device.
  • FIG. 4 is a simplified sectional illustration of the spinal device.
  • FIGS. 1 - 3 illustrate a spinal device 10 , constructed and operative in accordance with a non-limiting embodiment of the invention.
  • Spinal device 10 includes a rod 12 which has a first end 14 ( FIG. 4 ) disposed in a housing 16 and a second end 18 which protrudes out of housing 16 through an aperture 19 and which is movable to protrude more out of housing 16 or less out of housing 16 .
  • the term “rod” throughout encompasses any element with a round or non-round, regular or irregular perimeter, such as but not limited to, a rod, bar, lug, wire, post and others.
  • rod 12 may be coupled with a ratchet mechanism 20 for controlling the amount rod 12 protrudes out of housing 16 .
  • Ratchet mechanism 20 may include ratchet teeth 22 formed along an axial portion of rod 12 , and a pawl 24 arranged to catch on one of the teeth 22 .
  • Pawl 24 may extend from a controller element 26 mounted about a pivot 27 and provided with an eccentric cam 28 . Rotation of eccentric cam 28 moves pawl 24 to one of three positions: a) in ratchet engagement with teeth 22 so that rod 12 can incrementally move in one direction, b) in locked engagement with teeth 22 so that rod 12 cannot move at all, and c) moved out of engagement with teeth 22 so that rod 12 can move in both directions freely.
  • Other ratchet mechanisms can be used.
  • no ratchet mechanism is used; for example, rod 12 may be urged by an internal spring inside housing 16 .
  • Two polyaxial-joint attachment members 30 may be provided in device 10 , one at the second end 18 of rod 12 and the other one at another portion 21 of housing 16 . Both polyaxial-joint attachment members 30 are used to attach device 10 to available bone structure of the spine, such as by means of pedicle screws that pass through members 30 . It is noted that even after tightening a fastener to member 30 , the fastener securely holds the pedicle screw in place while enabling polyaxial rotation, as shown in U.S. patent Ser. No. 10/245,081.
  • Device 10 includes a biasing device 32 , which may be an add-on accessory which can be added to device 10 prior to or after installation in a patient; alternatively device 10 can be provided by the manufacturer with biasing device 32 .
  • a biasing device 32 which may be an add-on accessory which can be added to device 10 prior to or after installation in a patient; alternatively device 10 can be provided by the manufacturer with biasing device 32 .
  • the biasing device 32 may include a series of connected at-least partial coils 34 (e.g., spring coils).
  • coils 34 are full coils (full 360°).
  • coils 34 are partial coils that do not extend completely around rod 12 but instead subtend an angle of less than 360° and each pair of neighboring partial coils are connected by a connection member 36 .
  • the connection members 36 are separated from one another by a circumferential gap 38 .
  • biasing device 32 includes partial coils 34 , it can be placed directly over any axial portion of rod 12 as opposed to full coils which have to be slipped over an end of rod 12 and then slid axially to a desired axial position (a device with full coils can be supplied by the manufacturer. This feature allows adding biasing device 32 to device 10 even after device 10 has been installed in a patient.
  • a first end 40 of biasing device 32 is arranged to abut against housing 16 and a second end 42 , opposite to the first end 40 , is provided with a fastener 44 , such as a set screw to affix the second end 42 to rod 12 .
  • the axial fixation of the second end 42 determines the pretension of biasing device 32 .
  • the biasing device 32 After installation of device 10 in a patient, in a typical treatment plan, the biasing device 32 provides an urging force to the opposite ends of device 10 , such as to help straighten the patient's spine.

Abstract

A spinal device includes a rod which has a first end disposed in a housing and a second end which protrudes out of the housing through an aperture and which is movable to protrude more out of the housing or less out of the housing. A biasing device, mounted on the rod, includes a series of connected at-least partial coils. A first end of the biasing device is arranged to abut against the housing and a second end of the biasing device, opposite to the first end, is affixed to the rod.

Description

    CROSS REFERENCE TO RELATED APPLICATION(S)
  • This application is a continuation of U.S. patent application Ser. No. 16/726,872, filed Dec. 25, 2019, which is incorporated herein by reference.
    • FIELD OF THE INVENTION
  • The present invention relates generally to spinal implants and prostheses, and particularly to an add-on or integral biasing device for a spinal device, such as a spinal rod.
    • BACKGROUND OF THE INVENTION
  • Scoliosis is a spinal deformity affecting many people. Current surgical treatment involves affixing long fusion rods to the spine by pedicle screws. The rod system is intended to force the deformed spine into a more healthy position.
  • Unfortunately, there are severe shortcomings to this procedure; the deformation is rarely perfectly corrected, the long fusion for life is not a desired clinical situation and failures are not uncommon.
  • U.S. patent Ser. No. 10/245,081 to Arnin describes an improved ratcheted spinal device that includes a rod that can move out of a housing. The amount the rod protrudes out of the housing can be lengthened or shortened using a ratchet mechanism. The rod can be connected to standard pedicle screws as well as to other spinal rods or spinal structure, using appropriate connectors.
    • SUMMARY OF THE INVENTION
  • The present invention seeks to provide an improved spinal device or accessory for a spinal device, namely an add-on or integral biasing device for a spinal device, as is described more in detail hereinbelow.
  • There is thus provided in accordance with a non-limiting embodiment of the present invention a spinal device including a rod which has a first end disposed in a housing and a second end which protrudes out of the housing through an aperture and which is movable to protrude more out of the housing or less out of the housing, and a biasing device, mounted on the rod, which includes a series of connected at-least partial coils, wherein a first end of the biasing device is arranged to abut against the housing and a second end of the biasing device, opposite to the first end, is affixed to the rod.
  • The at-least partial coils may include full coils, or instead, a series of connected partial coils that do not extend completely around the rod but instead subtend an angle of less than 360° and each pair of neighboring coils of the partial coils are connected by a connection member and the connection members are separated from one another by a circumferential gap.
  • In accordance with an embodiment of the present invention a first end of the biasing device is arranged to abut against the housing and a second end of the biasing device, opposite to the first end, is provided with a fastener to affix the second end to the rod.
  • In accordance with an embodiment of the present invention axial fixation of the second end determines a pretension of the biasing device.
  • In accordance with an embodiment of the present invention the rod is coupled with a ratchet mechanism for controlling an amount the rod protrudes out of the housing.
  • In accordance with an embodiment of the present invention a first polyaxial-joint attachment member is at the second end of the rod and a second polyaxial-joint attachment member is at a portion of the housing.
  • In accordance with an embodiment of the present invention a method for adjusting curvature of a spine includes mounting a biasing device on a rod of a spinal device which is installed on spinal structure, the biasing device including a series of connected partial coils that do not extend completely around the rod but instead subtend an angle of less than 360° and each pair of neighboring coils of the partial coils are connected by a connection member and the connection members are separated from one another by a circumferential gap, and using the biasing device to apply an urging force to the rod and to the spinal structure.
    • BRIEF DESCRIPTION OF DRAWINGS
  • The present invention will be understood and appreciated more fully from the following detailed description, taken in conjunction with the drawings in which:
  • FIG. 1 is a simplified pictorial illustration of a spinal device, constructed and operative in accordance with an embodiment of the invention;
  • FIG. 2 is a simplified enlarged illustration of a biasing device of the spinal device of FIG. 1 ;
  • FIG. 3 is another simplified illustration of the biasing device, showing circumferential gaps between ends of partial coils of the biasing device; and
  • FIG. 4 is a simplified sectional illustration of the spinal device.
    •  DETAILED DESCRIPTION OF EMBODIMENTS
  • Reference is now made to FIGS. 1-3 , which illustrate a spinal device 10, constructed and operative in accordance with a non-limiting embodiment of the invention.
  • Spinal device 10 includes a rod 12 which has a first end 14 (FIG. 4 ) disposed in a housing 16 and a second end 18 which protrudes out of housing 16 through an aperture 19 and which is movable to protrude more out of housing 16 or less out of housing 16. The term “rod” throughout encompasses any element with a round or non-round, regular or irregular perimeter, such as but not limited to, a rod, bar, lug, wire, post and others.
  • As seen in FIG. 4 , rod 12 may be coupled with a ratchet mechanism 20 for controlling the amount rod 12 protrudes out of housing 16. Ratchet mechanism 20 may include ratchet teeth 22 formed along an axial portion of rod 12, and a pawl 24 arranged to catch on one of the teeth 22. Pawl 24 may extend from a controller element 26 mounted about a pivot 27 and provided with an eccentric cam 28. Rotation of eccentric cam 28 moves pawl 24 to one of three positions: a) in ratchet engagement with teeth 22 so that rod 12 can incrementally move in one direction, b) in locked engagement with teeth 22 so that rod 12 cannot move at all, and c) moved out of engagement with teeth 22 so that rod 12 can move in both directions freely. Other ratchet mechanisms can be used. Alternatively, no ratchet mechanism is used; for example, rod 12 may be urged by an internal spring inside housing 16.
  • Two polyaxial-joint attachment members 30 (such as but not limited to, a bearing race or simple hole) may be provided in device 10, one at the second end 18 of rod 12 and the other one at another portion 21 of housing 16. Both polyaxial-joint attachment members 30 are used to attach device 10 to available bone structure of the spine, such as by means of pedicle screws that pass through members 30. It is noted that even after tightening a fastener to member 30, the fastener securely holds the pedicle screw in place while enabling polyaxial rotation, as shown in U.S. patent Ser. No. 10/245,081.
  • Device 10 includes a biasing device 32, which may be an add-on accessory which can be added to device 10 prior to or after installation in a patient; alternatively device 10 can be provided by the manufacturer with biasing device 32.
  • The biasing device 32 may include a series of connected at-least partial coils 34 (e.g., spring coils). In one embodiment, coils 34 are full coils (full 360°). In another embodiment, coils 34 are partial coils that do not extend completely around rod 12 but instead subtend an angle of less than 360° and each pair of neighboring partial coils are connected by a connection member 36. As seen in FIG. 3 , the connection members 36 are separated from one another by a circumferential gap 38.
  • If biasing device 32 includes partial coils 34, it can be placed directly over any axial portion of rod 12 as opposed to full coils which have to be slipped over an end of rod 12 and then slid axially to a desired axial position (a device with full coils can be supplied by the manufacturer. This feature allows adding biasing device 32 to device 10 even after device 10 has been installed in a patient.
  • A first end 40 of biasing device 32 is arranged to abut against housing 16 and a second end 42, opposite to the first end 40, is provided with a fastener 44, such as a set screw to affix the second end 42 to rod 12. The axial fixation of the second end 42 determines the pretension of biasing device 32.
  • After installation of device 10 in a patient, in a typical treatment plan, the biasing device 32 provides an urging force to the opposite ends of device 10, such as to help straighten the patient's spine.

Claims (8)

What is claimed is:
1. A spinal device, comprising:
an implantable elongated member; and
an implantable biasing device coupled to said implantable elongated member, said implantable biasing device including a series of connected partial coils extending partially and not completely around said implantable elongated member.
2. The spinal device according to claim 1, wherein said series of connected partial coils subtends an angle of less than 360°.
3. The spinal device according to claim 2, wherein said series of connected partial coils includes pairs of connected neighboring coils, and wherein said pairs of connected neighboring coils are circumferentially separated from one another by a circumferential gap.
4. The spinal device according to claim 3, comprising:
a polyaxial-joint attachment member,
wherein said implantable elongated member extends from said polyaxial-joint attachment member.
5. The spinal device according to claim 4, comprising:
a fastener affixing said implantable biasing device to said implantable elongated member,
wherein said implantable biasing device includes an end portion, and said fastener affixes said end portion of said implantable biasing device to said implantable elongated member.
6. The spinal device according to claim 5, wherein said fastener is a set screw.
7. The spinal device according to claim 3, comprising:
a fastener affixing said implantable biasing device to said implantable elongated member,
wherein said implantable biasing device includes an end portion, and said fastener affixes said end portion of said implantable biasing device to said implantable elongated member.
8. The spinal device according to claim 7, wherein said fastener is a set screw.
US18/447,787 2019-12-25 2023-08-10 Biasing device for spinal device Pending US20230380868A1 (en)

Priority Applications (1)

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US18/447,787 US20230380868A1 (en) 2019-12-25 2023-08-10 Biasing device for spinal device

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Application Number Priority Date Filing Date Title
US16/726,872 US11723691B2 (en) 2019-12-25 2019-12-25 Biasing device for spinal device
US18/447,787 US20230380868A1 (en) 2019-12-25 2023-08-10 Biasing device for spinal device

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US16/726,872 Continuation US11723691B2 (en) 2019-12-25 2019-12-25 Biasing device for spinal device

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US18/447,787 Pending US20230380868A1 (en) 2019-12-25 2023-08-10 Biasing device for spinal device

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EP (1) EP4061263A4 (en)
JP (1) JP2023508391A (en)
KR (1) KR20220123242A (en)
CN (1) CN114867423A (en)
AU (1) AU2020411067A1 (en)
BR (1) BR112022012690A2 (en)
CA (1) CA3165587A1 (en)
MX (1) MX2022007797A (en)
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