Distractor
First Claim
Patent Images
1. A surgical distractor, comprising:
- a base plate having an annular portion;
an intermediate stage comprising a ring coupled to the annular portion by a first coupling, the first coupling comprising three helical structures adapted such that the annular portion and the intermediate stage are coupled together at three points spaced apart around the circumference of the annular portion and the intermediate stage; and
a distraction plate having a circular portion, the circular portion being coupled to the intermediate stage by a second coupling, the second comprising three helical structures adapted such that the intermediate stage and the distraction plate are coupled together at three points spaced apart around the circumference of the intermediate stage and the circular portion of the distraction plate;
wherein the at least one of the helical structures of the first and second couplings are configured to adapt relative rotary movement between the intermediate stage and at least one of the base plate and the distraction plate about an axis of rotation into relative linear movement between the intermediate stage and the base plate or distraction plate along the axis of rotation; and
wherein the pitch of each helical structure for each of the first coupling and the second coupling are the same.
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Accused Products
Abstract
A surgical distractor comprising a base plate (2), an intermediate stage (6) telescopically coupled to the base plate (2) and a distraction plate (4) telescopically coupled to the intermediate stage (6). The intermediate stage (6) is arranged to rotate relative to at least one of the base plate (2) and the distraction plate (4) to cause telescopic movement between the intermediate plate (6) and at least one of the base plate (2) and the distraction plate (4) such that the distraction plate (4) moves towards or away from the base plate (2). Surgical instrument kits incorporating distractors and drive elements and a method of distracting two bones within a joint are also disclosed.
89 Citations
10 Claims
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1. A surgical distractor, comprising:
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a base plate having an annular portion; an intermediate stage comprising a ring coupled to the annular portion by a first coupling, the first coupling comprising three helical structures adapted such that the annular portion and the intermediate stage are coupled together at three points spaced apart around the circumference of the annular portion and the intermediate stage; and a distraction plate having a circular portion, the circular portion being coupled to the intermediate stage by a second coupling, the second comprising three helical structures adapted such that the intermediate stage and the distraction plate are coupled together at three points spaced apart around the circumference of the intermediate stage and the circular portion of the distraction plate; wherein the at least one of the helical structures of the first and second couplings are configured to adapt relative rotary movement between the intermediate stage and at least one of the base plate and the distraction plate about an axis of rotation into relative linear movement between the intermediate stage and the base plate or distraction plate along the axis of rotation; and wherein the pitch of each helical structure for each of the first coupling and the second coupling are the same.
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2. A surgical distractor, comprising:
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a base plate having an annular portion; an intermediate stage comprising a ring coupled to the annular portion by a first coupling, the first coupling comprising three helical structures adapted such that the annular portion and the intermediate stage are coupled together at three points spaced apart around the circumference of the annular portion and the intermediate stage; a distraction plate having a circular portion, the circular portion being coupled to the intermediate stage by a second coupling, the second comprising three helical structures adapted such that the intermediate stage and the distraction plate are coupled together at three points spaced apart around the circumference of the intermediate stage and the circular portion of the distraction plate; and a second intermediate stage coupled between the intermediate stage and the distraction plate wherein the at least one of the helical structures of the first and second couplings are configured to adapt relative rotary movement between the intermediate stage and at least one of the base plate and the distraction plate about an axis of rotation into relative linear movement between the intermediate stage and the base plate or distraction plate along the axis of rotation.
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3. A surgical distractor, comprising:
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a base plate having an annular portion; an intermediate stage comprising a ring coupled to the annular portion by a first coupling, the first coupling comprising three helical structures adapted such that the annular portion and the intermediate stage are coupled together at three points spaced apart around the circumference of the annular portion and the intermediate stage; and a distraction plate having a circular portion, the circular portion being coupled to the intermediate stage by a second coupling, the second comprising three helical structures adapted such that the intermediate stage and the distraction plate are coupled together at three points spaced apart around the circumference of the intermediate stage and the circular portion of the distraction plate; wherein the at least one of the helical structures of the first and second couplings are configured to adapt relative rotary movement between the intermediate stage and at least one of the base plate and the distraction plate about an axis of rotation into relative linear movement between the intermediate stage and the base plate or distraction plate along the axis of rotation; and wherein each of the first coupling and the second coupling includes at least one inclined slot formed in at least one of the base plate, the intermediate stage and the distraction plate and at least one pin extending at least one of the base plate, the intermediate stage and the distraction plate sized and adapted to be received within the at least one inclined slot.
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4. A surgical distractor, comprising:
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a base plate having an annular portion; an intermediate stage comprising a ring coupled to the annular portion by a first coupling, the first coupling comprising three helical structures adapted such that the annular portion and the intermediate stage are coupled together at three points spaced apart around the circumference of the annular portion and the intermediate stage; and a distraction plate having a circular portion, the circular portion being coupled to the intermediate stage by a second coupling, the second comprising three helical structures adapted such that the intermediate stage and the distraction plate are coupled together at three points spaced apart around the circumference of the intermediate stage and the circular portion of the distraction plate; wherein the at least one of the helical structures of the first and second couplings are configured to adapt relative rotary movement between the intermediate stage and at least one of the base plate and the distraction plate about an axis of rotation into relative linear movement between the intermediate stage and the base plate or distraction plate along the axis of rotation; and wherein the distraction plate is arranged to rotate relative to the base plate to cause telescopic movement.
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5. A surgical instrument kit comprising:
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a surgical distractor comprising a base plate, an intermediate stage and a distraction plate, the base plate having an annular portion; the intermediate stage comprising a ring coupled to the annular portion by a first coupling, the first coupling comprising three helical structures adapted such that the annular portion and the intermediate stage are coupled together at three points spaced apart around the circumference of the annular portion and the intermediate stage; and the distraction plate having a circular portion, the circular portion being coupled to the intermediate stage by a second coupling, the second comprising three helical structures adapted such that the intermediate stage and the distraction plate are coupled together at three points spaced apart around the circumference of the intermediate stage and the circular portion of the distraction plate; wherein the at least one of the helical structures of the first and second couplings are configured to adapt relative rotary movement between the intermediate stage and at least one of the base plate and the distraction plate about an axis of rotation into relative linear movement between the intermediate stage and the base plate or distraction plate along the axis of rotation; wherein the distraction plate comprises a knurled rim and the surgical distractor further comprises an axle hole formed in the base plate; and an adjustment drive shaft having a tip to be received within the axle hole and a splined shaft proximal to the tip arranged to engage the knurled rim of the distraction plate when the tip is inserted into the axle hole; wherein rotating the drive shaft when the tip is received within the axle hole rotates the distraction plate relative to the base plate causing the distraction plate to move towards or away from the base plate. - View Dependent Claims (6, 7, 8, 9, 10)
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Specification