Motion disc spike seating instrument
OwnerDouglas Raymondinventor
Life of this patent
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Abstract
A seating device having a shaft and a U-shaped head for interposition between the prosthetic endplates of an intervertebral motion disc which, upon pivoting, more fully seats the teeth of the prosthetic endplates that lie upon the outer surfaces of the endplates.
Claims32
An assembly for seating prosthetic endplates of an intervertebral disc between upper and lower vertebral endplates, comprising:
- a) an upper prosthetic endplate having an outer surface having teeth for engaging the upper vertebral endplate and an inner surface having a peripheral rim,
- b) a lower prosthetic endplate having an outer surface having teeth for engaging the lower vertebral endplate and an inner surface having a peripheral rim,
- c) a seating device having a proximal shaft, an intermediate portion, and first and second distal tynes extending distally from the intermediate portion, each tyne having a distal end, an upper surface and a lower surface, wherein the inner surfaces of the endplates oppose each other to define a gap therebetween,
- wherein the intermediate portion and the tynes of the seating device are positioned within the gap, and
- wherein the thickness of the tynes is less than the thickness of the gap so that the distal end of one tyne does not contact an endplate.
A seating device for seating endplates of an intervertebral disc between upper and lower vertebral endplates, comprising:
- a) a proximal shaft,
- b) an intermediate portion extending transverse to the proximal shaft, and
- c) first and second distal tynes extending distally from the intermediate portion, each tyne having an upper surface and a lower surface,
- wherein at least one of the upper and lower surfaces is contoured with a protrusion to provide point contact with an inner surface of the respective endplate.
A method for seating endplates of an intervertebral disc between upper and lower vertebral endplates, comprising the steps of:
- a) providing an upper prosthetic endplate having an outer surface having teeth for engaging the upper vertebral endplate and an inner surface having a peripheral rim,
- b) providing a lower prosthetic endplate having an outer surface having teeth for engaging the lower vertebral endplate and an inner surface having a peripheral rim,
- c) engaging each prosthetic endplate to its respective vertebral endplate to define a gap between the inner surfaces of the endplates,
- d) inserting a seating device comprising a head portion having a thickness less than the gap between the endplates, and
- e) pivoting the head portion upon an endplate to force the teeth of the prosthetic endplates into the respective vertebral endplates.
A seating device for seating a prosthetic vertebral endplate, comprising:
- a) a proximal shaft having a proximal portion defining a longitudinal axis and a distal end portion offset from the longitudinal axis,
- b) an intermediate portion extending transversely from the distal end portion of the proximal shaft and having an upper surface and a lower surface, and
- c) first and second distal tynes extending distally from the intermediate portion, each tyne having an upper surface and a lower surface.
A seating device for seating a prosthetic vertebral endplate, comprising:
- a) a proximal shaft having a proximal portion defining a longitudinal axis and a docking arm extending transversely from the longitudinal axis,
- b) an intermediate portion extending transversely from the distal end portion of the proximal shaft and having an upper surface and a lower surface, and
- c) first and second distal tynes extending distally from the intermediate portion, each tyne having an upper surface and a lower surface.
A seating device for seating a prosthetic vertebral endplate, comprising:
- a) first and second handles defining a first longitudinal axis;
- b) first and second shafts respectively pivotally connected with the first and second handles, each shaft having a distal end;
- c) a U-shaped head portion for seating prosthetic endplates connected to the distal end of the first shaft,
- d) a docking arm for docking to a distractor tube connected to the distal end of the second.
A seating device for seating endplates of an intervertebral disc between upper and lower vertebral endplates, comprising:
- a) a proximal shaft having a distal end,
- b) first and second distal tynes extending distally from the distal end of the proximal shaft to form first and second arcs defining a circle having a midpoint, each tyne having an end,
- wherein the end of the first tyne forms an angle α. with respect to the distal end of the shaft and the midpoint, wherein the angle α is greater than 90 degrees, and.
- wherein the end of the second tyne forms an angle β with respect to the distal end of the shaft and the midpoint, wherein the angle β is less than 90 degrees.
Dependencies are inferred from the claim text.