Bone reamer and methods of use
A bone reamer includes a shaft having a first and a second end. The second end is configured to connect to a rotating power source. A head of the reamer includes a rear face connected to the first end of the shaft, a cutting face on an opposing side of the head relative to the rear face, and a perimeter portion having an inner perimeter diameter and an outer perimeter diameter. The outer perimeter diameter defines outer boundaries of the rear face and the cutting face. A blade member of the reamer is disposed upon the cutting face and extends at least across the inner perimeter diameter of the perimeter portion. A center drill bit is disposed on the cutting face. The drill bit and cutting blade are concentric about a center axis of the reamer.
1 . A bone reamer comprising:
a shaft having a first and a second end, the second end configured to connect to a power source;
a head comprising: (i) a rear face connected to the first end of the shaft, (ii) a cutting face on an opposing side of the head relative to the rear face, and (iii) a perimeter portion having an inner perimeter diameter and an outer perimeter diameter, the outer perimeter diameter defining outer boundaries of the rear face and the cutting face;
a single blade member disposed upon the cutting face and extending at least across the inner perimeter diameter of the perimeter portion, the blade member being configured to alone cut a smooth circular surface into a portion of a bone during rotation of the bone reamer and comprising: (i) a first blade portion having a first cutting edge, and (ii) a second blade portion having a second cutting edge, the first and second cutting edges being disposed on opposing sides of the blade member;
a center drill bit disposed on the cutting face between the first and second blade portions of the blade member, the center drill bit being configured to drill a center bore hole into the portion of the bone during rotation of the bone reamer, the center drill bit and the blade member being concentric with a center axis of the reamer; and
a plurality of cutting pegs disposed symmetrically around an inner circumference of the cutting face at a radial location between the first blade portion and the second blade portion such that all of the cutting pegs on the cutting face are spaced apart from the first blade portion and the second blade portion, the inner circumference being concentric with the center axis and having a smaller diameter than the outer perimeter diameter of the perimeter portion, the cutting pegs being configured to form a circular groove into the smooth circular surface of the portion of the bone formed by the blade member during rotation of the bone reamer.
2 . The bone reamer of claim 1 , wherein each of the at least two cutting pegs comprise:
a peg body having an upper end portion extending away from the cutting face of the head; and
a peg cutting blade disposed on the upper end portion, the peg cutting blade operable to cut through bone as the bone reamer is rotated.
3 . The bone reamer of claim 1 , wherein the at least two cutting pegs comprise at least 6 pegs.
4 . The bone reamer of claim 1 , wherein the perimeter portion includes a first removable member, the first removable member comprising:
a first end having a breakable connection to an adjacent first section of the perimeter portion, the first end configured to break off of the first section when a predetermined torque is applied to the first removable member; and
a second end that is spaced apart from an adjacent second section of the perimeter portion, the second section of the perimeter portion having rounded surfaces disposed between the rear face and the cutting face of the head.
5 . The bone reamer of claim 4 , wherein the perimeter portion includes a second removable member, the second removable member comprising:
a third end having a breakable connection to an adjacent third section of the perimeter portion, the third end configured to break off of the third section when a predetermined torque is applied to the second removable member; and
a fourth end that is spaced apart from an adjacent fourth section of the perimeter portion, the fourth section of the perimeter portion having rounded surfaces disposed between the rear face and the cutting face of the head.
6 . The bone reamer of claim 5 , wherein the first and second removable members each form a circular arc spanning an angular range of between 30 to 45 degrees.
7 . A bone reamer comprising:
a shaft having a first and a second end, the second end configured to connect to a power source;
a head comprising:
a rear face connected to the first end of the shaft,
a cutting face on an opposing side of the head relative to the rear face, and
a perimeter portion having an inner perimeter diameter and an outer perimeter diameter, the outer perimeter diameter defining outer boundaries of the rear face and the cutting face, wherein the perimeter portion also includes a first removable member, the first removable member comprising:
a first end having a breakable connection to an adjacent first section of the perimeter portion, the first end configured to break off of the first section when a predetermined torque is applied to the first removable member, and
a second end that is spaced apart from an adjacent second section of the perimeter portion, the second section of the perimeter portion having rounded surfaces disposed between the rear face and the cutting face of the head; and
a blade member disposed upon the cutting face and extending at least across the inner perimeter diameter of the perimeter portion, the blade member comprising:
a first blade portion having a first cutting edge, and
a second blade portion having a second cutting edge, the first and second cutting edges being disposed on opposing sides of the blade member.
8 . The bone reamer of claim 7 , wherein the perimeter portion includes a second removable member, the second removable member comprising:
a third end having a breakable connection to an adjacent third section of the perimeter portion, the third end configured to break off of the third section when a predetermined torque is applied to the second removable member; and
a fourth end that is spaced apart from an adjacent fourth section of the perimeter portion, the fourth section of the perimeter portion having rounded surfaces disposed between the rear face and the cutting face of the head.
9 . The bone reamer of claim 8 , wherein the first and second removable members each form a circular arc spanning an angular range of between 30 to 45 degrees.
10 . The bone reamer of claim 8 , comprising:
a center drill bit disposed on the cutting face between the first and second cutting edges of the blade member, the center drill bit and the blade member being concentric with a center axis of the reamer.
11 . The bone reamer of claim 8 comprising:
at least two cutting pegs disposed symmetrically around an inner circumference of the cutting face, the inner circumference being concentric about the center axis and having a smaller diameter than the outer perimeter diameter of the perimeter portion.
12 . A surgical kit comprising:
a disposable bone reamer configured to simultaneously machine a circular surface, a circular groove, and a center bore hole in a bone, the bone reamer comprising:
(i) a shaft having a first and a second end, the second end configured to connect to a power source,
(ii) a head comprising: (a) a rear face connected to the first end of the shaft, (b) a cutting face on an opposing side of the head relative to the rear face, and (c) a perimeter portion having an inner perimeter diameter and an outer perimeter diameter, the outer perimeter diameter defining outer boundaries of the rear face and the cutting face, and (iii) a single blade member disposed upon the cutting face and extending at least across the inner perimeter diameter of the perimeter portion, the blade member being configured to alone cut the circular surface into the bone during rotation of the bone reamer and comprising: (a) a first blade portion having a first cutting edge, and (b) a second blade portion having a second cutting edge, the first and second cutting edges being disposed on opposing sides of the blade member,
(iii) a center drill bit disposed on the cutting face between the first and second cutting edges of the blade member, the center drill bit being configured to drill the center bore hole into the bone during rotation of the bone reamer, the center drill bit and the blade member being concentric with a center axis of the reamer, and
(iv) a plurality of cutting pegs disposed symmetrically around an inner circumference of the cutting face at a radial location between the first blade portion and the second blade portion such that all of the cutting pegs on the cutting face are spaced apart from the first blade portion and the second blade portion, the inner circumference being concentric with the center axis and having a smaller diameter than the outer perimeter diameter of the perimeter portion, the cutting pegs being configured to form the circular groove in the bone during rotation of the bone reamer;
a pin for placement of the bone reamer on the bone; and
an implant for insertion onto the circular surface and into the circular groove and the center bore hole of the bone.
13 . The surgical kit of claim 12 , further comprising an insertion tool for use with inserting the implant into the center bore hole of the bone.
14 . The surgical kit of claim 12 , further comprising at least one sizer and a handle for use with placing the pin within the bone.
15 . The surgical kit of claim 12 , further comprising at least one trial for testing the size of the implant within the circular surface and the center bore hole of the bone.