a femoral stem
A femoral stem and femoral neck technology, applied in the direction of the femoral shaft, femoral head, hip joint, etc., can solve the problems of jumping, running, loose prosthesis, etc., and achieve the effect of reducing compressive stress and expanding the force-bearing area
Inactive Publication Date: 2020-09-04
吴承锦
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Problems solved by technology
[0004] The existing femoral stem prosthesis, no matter whether it is a one-piece structure or a modular structure, can only be used for walking, but not for jumping and running, because when people jump and run, the hip joint has to bear greater stress. This stress exceeds the strength of the femoral stem combined with the femoral canal of the prior art, causing the prosthesis to loosen
Method used
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Embodiment Construction
[0024] Embodiments of the femoral stem of the present invention will be described below with reference to the accompanying drawings. Those skilled in the art would recognize that the described embodiments can be modified in various ways or combinations thereof without departing from the spirit and scope of the invention. Accordingly, the drawings and description are illustrative in nature and not intended to limit the scope of the claims. Also, in this specification, the drawings are not drawn to scale, and like reference numerals denote like parts.
[0025] Such as figure 1 As shown, the femoral stem of the present invention includes a femoral neck 1 and a stem body 2 . The upper end of the femoral neck 1 is usually an elliptical structure, the upper end of the femoral neck 1 is connected with the femoral head 5, and is coupled with the femoral head 5 and the acetabular cup (not shown), and the handle 2 is used for It is inserted into the bone marrow cavity 100 of the femu...
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A prosthtic femoral stem comprises a stem body, a femoral neck, a first spring and a second spring, wherein a channel is formed in the stem body; the femoral neck downwards extends to obtain a transmission rod which moves in the channel in a reciprocating manner; and the first spring is arranged between the outer periphery of the transmission rod and the channel. The second spring is arranged between a position of the upper third of the transmission rod facing inwards and the channel, and the compression travel of the second spring is shorter than that of the first spring. A gear and rack engaged section is arranged between the outer side wall of the transmission rod and the side wall of the channel, a pull wire is wound on a reel which is coaxial with a gear, and the other end of the pullwire is fixed at the upper third of the transmission rod. In a downward movement process of the transmission rod, the second spring is compressed to a limited position before the first spring, part of pressure stress applied to the inside is transmitted to a proximal end of femur at first, a rack drives the gear to rotate, and the pull wire downwards pull the upper third of the transmission rod to relieve upward tensile stress applied to the transmission rod. The prosthtic femoral stem conforms to a bearing and stress conduction mode of femur in a physiological status.
Description
technical field [0001] The invention relates to the field of medical instruments, in particular to a femoral stem. Background technique [0002] A femoral stem is a surgical implant used to replace the femoral portion of the human hip joint. The femoral stem includes a generally cylindrical femoral neck and a generally rod-shaped stem. The stem extends from the femoral neck and is inserted into the medullary cavity of the femur. The femoral neck is connected to the femoral head, and the femoral head is embedded in the acetabular prosthesis. The femoral head can rotate within the acetabular component. After the stem is inserted into the femoral cavity, various forms can be used to connect and fix the stem with the inner wall of the proximal femur, such as bone cement and press-fit biological fixation, so that the femoral stem can transmit the applied stress to the bone of the proximal femur , to achieve the purpose of conducting stress when people walk. [0003] When the ...
Claims
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IPC IPC(8): A61F2/36
CPCA61F2/3609A61F2/3662A61F2/3676A61F2002/3625A61F2002/3678
Inventor 吴承锦
Owner 吴承锦