System and device for designing and forming a surgical implant
A method is provided for determining the shape of a surgical linking device that is to be attached to a bony body structure such as the spinal column based on digitized locations of a plurality of attachment elements engaged to the bony structure. The method is implemented by a computer system through a GUI to generate an initial bend curve to mate with the plurality of attachment elements. The initial bend curve may be simplified based on user input to the GUI to reduce the number of bends necessary to produce a well-fitting linking device and may be altered to help obtain the goals of the surgery.
1. A device for bending a spinal rod comprising:
a fixed die;
a moving die spaced apart from the fixed die to receive the spinal rod between the fixed die and moving die;
a first elongated member supporting the fixed die;
a second elongated member supporting the moving die and pivotably engaged to the first member to pivot the moving die relative to the fixed die, each die having a surface contacting the spinal rod and configured to impart a bend to the spinal rod upon pivoting of said moving die;
an angle gauge positioned between said first and second elongated members, said angle gauge configured for initially supporting said second elongated member relative to said first elongated member in one of a plurality of pre-determined angular positions, said angle gauge further rotatable about an outer surface of said fixed die;
a clamp mounted to said one of said first and second elongated members and configured to engage the spinal rod with the rod in position between the fixed and moving dies; and
a dial associated with said clamp and configured to rotate said clamp about the longitudinal axis of the spinal rod to a pre-determined angular orientation.
2. The device for bending a spinal rod of claim 1 , wherein said clamp is carried by a block slidably mounted to said one of said first and second elongated members.
3. The device for bending a spinal rod of claim 2 , wherein said block and said one of said first and second elongated members defines a series of stops at pre-determined locations along a length of the elongated member.
4. The device for bending a spinal rod of claim 1 , wherein said first and second elongated members are pivotably mounted to each other so that pivoting said elongated members through said one of a plurality of pre-determined angular positions imparts a bend to the spinal rod disposed between the fixed and moving dies.
5. The device for bending a spinal rod of claim 1 , wherein the pre-determined angular positions of the angle gauge are variable in 5 degree increments.
6. The device for bending a spinal rod of claim 1 , wherein the pre-determined angular orientation of the dial are variable in 5 degree increments.
7. The device for bending a spinal rod of claim 3 , wherein the distance between the stops is 5 millimeters.
8. The device for bending a spinal rod of claim 1 , wherein the first elongated member is a lever.
9. The device for bending a spinal rod of claim 1 , wherein the second elongated member is a lever with a handle.
10. A device for bending a spinal rod comprising:
a fixed die;
a moving die spaced apart from the fixed die to receive the rod between the fixed die and the moving die;'
a first elongated member supporting the fixed die;
a second elongated member supporting the moving die and pivotably engaged to the first elongated member to pivot the moving die relative to the fixed die, each die having a surface contacting the rod and configured to impart a bend to the rod upon pivoting of said moving die;
a support member positioned between said first and second elongated members, said support member configured for initially supporting said second elongated member relative to said first elongated member in one of a plurality of pre-determined angular positions, said support member further rotatable about an outer surface of said fixed die;
wherein the device has a first adjustment mechanism that adjusts the position of the rod relative to the fixed die and the moving die to select a bend location along the longitudinal axis of the rod, a second adjustment mechanism that rotates the rod about its longitudinal axis to select a bend plane, and a third adjustment mechanism that adjusts the travel of the moving die about the circumference of the fixed die to select a bend angle for the rod.
11. The device for bending a spinal rod of claim 10 , wherein the first adjustment mechanism is associated with the first elongated member.
12. The device for bending a spinal rod of claim 10 , wherein the second adjustment mechanism is associated with the first elongated member.
13. The device for bending a spinal rod of claim 11 , wherein the third adjustment mechanism comprises said support member and imparts the bend through cooperation of the first and second elongated members.
14. The device for bending a spinal rod of claim 10 , wherein the first adjustment mechanism changes the bend location by sliding the rod along a series of stops at pre-determined locations along a length of the first elongated member.
15. The device for bending a spinal rod of claim 14 , wherein the distance between the stops is 5 millimeters.
16. The device for bending a spinal rod of claim 10 , wherein the second adjustment mechanism is a dial configured to rotate the first adjustment mechanism about the longitudinal axis of the rod to a pre-determined angular orientation.
17. The device for bending a spinal rod of claim 10 , wherein the second adjustment mechanism rotates the position of the rod in 5 degree increments.
18. The device for bending a spinal rod of claim 10 , wherein the third adjustment mechanism is a pivot mechanism.
19. The device for bending a spinal rod of claim 18 , wherein the third adjustment mechanism changes the bend angle by selecting a pivot through one of a plurality of pre-determined angular positions from a first pre-determined angular position to a second pre-determined angular position.
20. The device for bending a spinal rod of claim 17 , wherein the pre-determined angular positions are adjustable in 5 degree increments.
21. The device for bending a spinal rod of claim 10 , wherein the first elongated member is a lever.
22. The device for bending a spinal rod of claim 10 , wherein the second elongated member is a lever with a handle.