Patent Application
20180125506
The present invention relates to a reamer for acetabular procedures. More particularly, this invention relates to a reamer for acetabular procedures.
A need for a reamer for acetabular procedures has been present for a long time considering the expansive demands in the everyday life. This invention is directed to solve these problems and satisfy the long-felt need.
The present invention contrives to solve the disadvantages of the prior art.
An object of the invention is to provide a reamer for acetabular procedures.
Another object of the invention is to provide a reamer for acetabular procedures.
An aspect of the invention provides a reamer for acetabular procedures.
A reamer for acetabular procedures comprises a hemispherical head portion, a plurality of through-holes, a stem portion, a center hole, and a tool-engaging portion.
The plurality of through-holes are bored through a shell portion of the hemispherical head portion.
The stem portion extends from an inner peak portion of the hemispherical head portion and has a specific length.
The center hole is bored through the stem portion and the shell portion of the hemispherical head portion.
The tool-engaging portion is provided at an end portion of the stem portion and configured for engaging an external tool for spinning the reamer.
A size of each of the plurality of through-holes may be proportional to a distance from the peak portion to the position of the specific through-hole.
Each of the plurality of through-holes may be configured for grinding a bone structure and removes the ground bone powder therethrough from an outside of the hemispherical head portion to an inside of the hemispherical head portion.
The hemispherical head portion may be hollow inside. The hemispherical head portion may open rearwards.
Alternatively, the hemispherical head portion may be closed rearwards by a blocking surface portion.
The stem portion may have a circular cross-section.
The tool-engaging portion may have a cross-section of a regular polygon.
The regular polygon may comprise a square and a hexagon.
The reamer may further comprise a center pin having an engaging portion provided an end portion thereof and a guiding portion extending from the engaging portion, and the center pin is configured for being fixed to the acetabulum by the engaging portion and queued through the center hole by the guiding portion.
The advantages of the present invention are: the reamer for acetabular procedures according to the invention can provide:
(1) helping the surgeon in preparation of the acetabular procedures; and
(2) making the reaming of acetabulum precise.
Although the present invention is briefly summarized, the fuller understanding of the invention can be obtained by the following drawings, detailed description and appended claims.
These and other features, aspects and advantages of the present invention will become better understood with reference to the accompanying drawings, wherein:
Computer navigated patient specific custom mold is provided for anatomic acetabular preparation.
The device is prepared through MRI/CT scan and this device is patient specific accurate pin centering guide.
The device includes custom molded acetabular portion with central pin guided hole, reamer guide device, and reamer with center hole.
After surgical open of the hip joint, the acetabular portion is placed in prenavigated corresponding acetabular cavity, and stabilizing pins at 12 o'clock in ilium, 6 o'clock in ischium, and 8 o'clock in pubic bone.
(1) First Option: a guide pin is introduced to center of acetabulum in depth of acetabular wall through the center hole of the device after removed the device, reaming acetabulum with central holes, reamer along the guide pin.
(2) Second Option: after removed the first device (acetabular occupying device), the second device (reamer guide device) is placed along the corresponding stabilizing pins at ilium, ischium, and pubic bone, reaming acetabulum along the reamer guide groove.
An aspect of the invention provides a positioning device 100 for acetabular procedures.
The positioning device 100 for acetabular procedures includes a base plate 10, a central pin guide hole 20, a first positioning hole 30, and a second positioning hole 40 as shown in
The base plate 10 has a top surface portion 12, a bottom surface portion 14, and side edge portion 16 connecting the top surface portion 12 and the bottom surface portion 12 as shown in
The central pin guide hole 20 is provided through a central portion of the base plate 10 and configured for guiding a center pin 60 to be disposed in a specific portion of an acetabulum 920 of a patient as shown in
The first positioning hole 30 is provided through a first edge portion of the base plate 10 and configured for guiding a first stabilizing pin 31 as shown in
The second positioning hole 40 is provided through a second edge portion of the base plate 10 and configured for guiding a second stabilizing pin 41 as shown in
The positioning device 100 may further comprise a third positioning hole 50 provided through a third edge portion of the base plate 10 and configured for guiding a third stabilizing pin 51 as shown in
The first positioning hole 30 may be provided approximately at a superior direction configured for being fixed at a portion of ilium 930 and the second positioning hole 40 is provided approximately at an inferior direction configured for being fixed at a portion of ischium 940.
In certain embodiments of the invention, the superior direction may be a 12 o'clock direction.
In certain embodiments of the invention, the inferior direction may be a 6 o'clock direction.
The third positioning hole 50 may be provided approximately at a posterior direction configured for being fixed at a portion of pubic bone.
In certain embodiments of the invention, the posterior direction may be an 8 o'clock direction.
The base plate 10 may have a substantially circular shape as shown in
The circular shape of the base plate 10 may have a diameter large enough to cover an opening of the acetabulum 920 as shown in
Each of the first, second, and third positioning holes 30, 40, 50 may be provided through an edge portion of the base plate 10, and the edge portion protrudes from a circumferential portion of the base plate 10 as shown in
In certain embodiments of the invention, one or two, or none of the first, second, and third positioning holes 30, 40, 50 may protrude from a circumferential portion of the base plate 10.
The central pin guide hole 20 may be provided through a cylindrical protrusion 22 protruding vertically from the top surface portion of the base plate 10 as shown in
The base plate 10 may further comprise a side cutout portion 18 from the central pin guide hole 20 to the outer edge portion of the base plate 10 as shown in
In certain embodiments of the invention, the base plate 10 with the side cutout portion 18, shown in
The gap of the side cutout portion 18 may be smaller than the diameter of the central pin guide hole 20.
The first positioning hole 30 may be provided approximately at a superior direction configured for being fixed at a portion of ilium 930 and the second positioning hole 40 is provided approximately at a posterior direction configured for being fixed at a portion of pubic bone 950 as shown in
In certain embodiments of the invention as shown in
As shown in
An aspect of the invention provides a reamer 200 for acetabular procedures.
A reamer 200 for acetabular procedures comprises a hemispherical head portion 210, a plurality of through-holes 220, a stem portion 230, a center hole 240, and a tool-engaging portion 250 as shown in
The plurality of through-holes 220 are bored through a shell portion of the hemispherical head portion 210.
The stem portion 230 extends from an inner peak portion of the hemispherical head portion 210 all the way down to the lower end of the reamer 200 and has a specific length.
The center hole 240 is bored through the stem portion 230 and the shell portion of the hemispherical head portion 210.
The tool-engaging portion 250 is provided at an end portion of the stem portion 230 and configured for engaging an external tool (not shown) for spinning the reamer 200.
A size of each of the plurality of through-holes 220 may be proportional to a distance from the peak portion to the position of the specific through-hole 220.
Each of the plurality of through-holes 220 may be configured for grinding a bone structure and removes the ground bone powder therethrough from an outside of the hemispherical head portion 210 to an inside of the hemispherical head portion 210.
The hemispherical head portion 210 may be hollow inside as shown in
The hemispherical head portion 210 may open rearwards as shown in
Alternatively, the hemispherical head portion 210 may be closed rearwards by a blocking surface portion. This may be envisioned using
The stem portion 230 may have a circular cross-section. The tool-engaging portion 250 may have a cross-section of a regular polygon.
The regular polygon may comprise a square and a hexagon.
The reamer 200 may further comprise a center pin 60 having an engaging portion 62 provided an end portion thereof and a guiding portion extending from the engaging portion 62, and the center pin 60 is configured for being fixed to the acetabulum by the engaging portion 62 and queued through the center hole 240 by the guiding portion.
The center pin 60 is to be queued through the center hole 240, which is shown by the dashed line in
The reamer guide 300 can be used to position over the acetabulum 920 as shown in
While the invention has been shown and described with reference to different embodiments thereof, it will be appreciated by those skilled in the art that variations in form, detail, compositions and operation may be made without departing from the spirit and scope of the invention as defined by the accompanying claims.
