BRIEF DESCRIPTIONS OF THE DRAWINGS
FIG. 1 illustrates the exploded view of the present invention
FIGS. 2
a-2b illustrate the vertical views of the femoral IM alignment guide with 5° valgus angle of horizontal openings;
FIGS. 2
c-2d illustrate the vertical views of the femoral IM alignment guide with 7° valgus angle of horizontal openings;
FIGS. 2
e-2f illustrate the vertical views of the femoral IM alignment guide with 9° valgus angle of horizontal openings;
FIGS. 3
a-3b illustrate the vertical views and front views of the distal femoral cutting guide before the positioning device spun;
FIGS. 3
c-3d illustrate the vertical views and front views of the distal femoral cutting guide after the positioning device spun;
FIG. 4 illustrates the perspective view of adopting the femoral IM rod and the femoral IM alignment guide;
FIG. 5 illustrates the perspective view of adopting the distal femoral alignment guide;
FIG. 6 illustrates the perspective view of adopting the distal femoral cutting guide;
FIG. 7 illustrates the perspective view of fixing the distal femoral cutting guide; and
FIG. 8 illustrates the perspective view of the final distal femoral cutting.
DETAILED DESCRIPTIONS OF THE PREFERRED EMBODIMENT
FIG. 1 illustrates the exploded view of surgical tool assembly adopted in TKA, including a femoral IM rod 1, a femoral IM alignment guide 2, a distal femoral alignment guide 3, and a distal femoral cutting guide 4. The femoral IM rod 1 is a T-shaped structure formed by a shaft 11 and a rod 12. The femoral IM alignment guide 2 comprises a wing section 21 at both sides respectively, a horizontal opening 22 for receiving the IM rod 1 in the middle and two vertical openings 23 on the top. The distal femoral alignment guide 3 includes a platform 31, a sliding track 32 on the platform 31, and two legs 33 beneath inserted into the two vertical openings 23. The distal femoral cutting guide 4 comprises a positioning device 41, a saw slot 42, fixing holes 43, and a sliding concave 44 for receiving the sliding track 31.
The structure of the invention utilizes the distal femoral cutting guide slid to the distal femoral alignment guide in the orientation from distal to proximal to reduce the size of the incision and provide more convenience to the knee replacement surgical procedure and to minimize the femoral quadriceps damage to facilitate patients' rehabilitation after surgery.
Referring to FIGS. 2a-2f, individually illustrating the vertical views of the femoral IM alignment guide 2 with 5°, 7° and 9° valgus angles. The angles coincide with the differences between the mechanical axes and the anatomical axes.
As illustrated in FIGS. 3a-3b, the positioning device protruding 45 hides inside the distal femoral cutting guide 4 before the positioning device 41 spun 41. As illustrated in FIGS. 3c-3d, the positioning device protruding 45 extended to fasten the distal femoral cutting guide 4 after the positioning device 41 spun.
As illustrated in FIG. 4, the rod 12 is inserted throughout the horizontal opening 22 of the femoral IM alignment guide 2 into the femur 5 to locate the femoral IM alignment guide 2 with respect to the femur 5. The horizontal openings are with the valgus angles coinciding to the differences between the mechanical axes and the anatomical axes. As illustrated in FIG. 5, the distal femoral alignment guide 3 is combined with the femoral IM alignment guide 2 by inserting the two legs 33 into the corresponding vertical openings 23 and the distal femoral alignment guide 3 is adjusted to a proper height according to the thickness of the distal femur 5. Then referring to FIG. 6, in the orientation from distal to proximal, the distal femoral cutting guide 4 is slid to the distal femoral alignment guide 3 by integrating the sliding concave 44 with the sliding track 32 and the size of the distal resection depends on the distal resection numbers 321 carved on the sliding track 32. There are four locking concaves on the sliding track of the distal femoral alignment guide 3. After the positioning device 41 spun, the positioning device protruding 45 extended to locate in the proper locking concave 322 of the distal femoral alignment guide 3 to lock the distal femoral cutting guide 4. The pins 46 are drilled through the fixing holes 43 into the distal femur 5 for securing the distal femoral cutting guide 4 with respect to the medullary canal and distal condyle as illustrated in FIG. 7. The femoral IM rod 1, the femoral IM alignment guide 2 and the distal femoral alignment guide 3 may then be removed and the distal cut may be performed by putting the saw 47 into the saw slot 42 as illustrated in FIG. 8 to form a cutting plane perpendicular to the mechanical axis.
While the invention has been particularly shown and described with reference to the preferred embodiments thereof, these are, of course, merely examples to help clarify the invention and are not intended to limit the invention. It will be understood by those skilled in the art that various changes, modifications, and alterations in form and details may be made therein without departing from the spirit and scope of the invention, as set forth in the following claims.
Patent Application
20080097451
