Abstract:
The present invention relates to an apparatus for fitting a protecting femoral neck device. The said apparatus includes a clamping base. A fixation element whose circumference size can be adjusted according to the size of the femoral neck in mounted on an end of the said clamping base and a locating element is mounted on the other end of the said clamping base. An element for shaping the bone can be fixed on the said locating element.

Description:
BACKGROUND OF THE INVENTION 
   1. Field of the Invention 
   The present invention relates to a medical apparatus for fitting a protecting femoral neck device, more particularly to an apparatus for easily fitting a protecting femoral neck device onto an injured femoral neck that can shorten the time of the surgical operation and reduce the patient&#39;s pain. 
   2. Description of the Related Art 
   In general, the method for connecting a femoral neck is nothing more than covering the femoral neck with a sheet steel and fixing into the femur. Since poor structure and design for such connection are common, therefore the foregoing method has the drawbacks that the fixation and coverage are not stable, and the newly grown blood vessels and callous formations cannot effectively cover the whole steel material. The sheet steel cannot be coupled with the femur fully as a whole for the protection, and thus limits the endurance of the femur and the covered steel material for bearing forces and usually results in an easy separation. Such method has a significant deficiency in its application and increases the pain of the patient. The foregoing drawbacks have been bothering medical staffs and the patients for long. 
   To overcome the foregoing drawbacks, a protecting femoral neck device is invented. The protecting femoral neck device is a hollow sleeve which comprises a screw passing through the sleeve for protecting the femoral neck from being injured again. However, before the prosthetic device can be used, the injured femur must be cut into the shape that precisely fits the connection of the sleeve onto the cut femur, so that the flange of the sleeve can attach closely onto the surface of the femur, and then a screw is secured to the bone connected with the femoral neck. The current common installation method adopts an operating knife or a reamer for the surgical operation and bases on the surgeon&#39;s experience to slowly cut the femoral neck into the required shape. Such arrangement not just takes a long time for the surgical operation, but also has difficulty for precisely cutting the femur into the required size or may even cause pain to the patient during the surgical operation. 
   SUMMARY OF THE INVENTION 
   Therefore it is the primary objective of the present invention to provide a technical solution for the foregoing problems as well as an apparatus for easily fitting a protecting femoral neck device onto an injured femoral neck that can shorten the time of the surgical operation and reduce the patient&#39;s pain. 
   The technical measures taken by the present invention to solve the foregoing problems by providing an apparatus for fitting the protecting femoral neck device that comprises: a clamping base, and the clamping base has a fixation element thereon, and the fixation element is comprised of two symmetrical semicircular rings. The semicircular rings are pivotally coupled with each other at one end and selectively opened and closed at the other end, and the clamping base further comprises a movable locating element being disposed at position corresponding to the fixation element and keeping a predetermined distance from the fixation element, and the locating element comprises an open groove and a broach being sheathed onto the clamping base and having a support rod disposed on the broach, and the support rod has a locating member and is coupled to a sleeve, and the sleeve has a serration disposed at the periphery of an opening of the sleeve. It is obvious that the following beneficial results will be obtained when the aforementioned solution is adopted. The structure of this invention is feasible, and the idea is great. The fixation element can be adjusted according to the size of the femoral neck for its application, so that the fixation element can be clamped and fixed onto the femoral neck. After a boring head is connected to the fixation element at a specific position of a boring hole on the femur, the broach passes into the fixation element and connects to a portion of the periphery of the femoral neck. Therefore, the femur can be grinded into the required shape, and a surgeon can easily fit the protecting femoral neck device onto the femoral neck. The present invention is simple-to-use and easy-to-install and thus worthy for its promotion. 
   To make it easier for our examiner to understand the objective of the invention, its structure, innovative features, and performance, we use a preferred embodiment together with the attached drawings for the detailed description of the invention. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
       FIG. 1  is a perspective view of the disassembled apparatus for easily fitting a protecting femoral neck device according to the present invention. 
       FIG. 2  is a perspective view of the apparatus for easily fitting a protecting femoral neck device according to the present invention. 
       FIG. 3  is a perspective view of the clamping base being coupled to the femoral neck according to the present invention. 
       FIG. 4  is a perspective view of the disassembled structure of the clamping base being coupled to the femoral neck according to the present invention. 
       FIG. 5  is a perspective view of the clamping base being coupled to the femoral neck for its use according to the present invention. 
       FIG. 6  is a perspective view of the clamping base being coupled to the femoral neck for boring according to the present invention. 
       FIG. 7  is a perspective view of the broach as depicted in  FIG. 1  being coupled to the clamping base according to the present invention. 
       FIG. 8  is a perspective view of the broach when it is boring according to the present invention. 
       FIG. 9  is a perspective view of the broach and the clamping base being removed from the femoral neck according to the present invention. 
       FIG. 10  is a perspective view of the apparatus for easily fitting a protecting femoral neck device being coupled to the femoral neck for boring according to the present invention. 
   

   DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
   Please refer to  FIGS. 1 and 2  for an apparatus for fitting a protecting femoral neck device according to the present invention. The apparatus comprises a clamping base  10 , and the clamping base  10  has a fixation element  20 , and the fixation element  20  is in a tapered shape and comprised of two symmetrical semicircular rings  21 , and the semicircular rings  21  has an upwardly extending flange  211  disposed at an inwardly contracted end, and a pivotal member  22  for movably coupled the semicircular rings  21  is disposed at one end of the flanges  211 , and thus the connection of the semicircular rings  21  by the pivotal member  22  can couple the semicircular rings as well as providing the opening and closing functions. Further, an embedding body  23  and a corresponding serrated bar  24  are disposed on the surface of an edge at the other end of the semicircular rings  21 ; wherein the serrated bar  24  is comprised of a plurality of equidistant serrations  241 , so that the embedding body  23  can be embedded into one of the serrations  241  of the serrated bar  24  according to the size of the femoral neck when the apparatus is in use. Then, the fixation element  2  can be mounted closely to the femoral neck and cannot be rotated freely as shown in  FIG. 4 . 
   Further, one of the semicircular rings  21  of the fixation element  20  is pivotally coupled with a movable support rod  31  at a predetermined position, and the support rod  31  is coupled with a pivotal base  212  of the semicircular ring  21  by the insertion of an insert pin only, so that the support rod  31  can be inclined to an angle to be fixed onto the fixation element  20  and also moved outward. The support rod  31  has a locating element  30  on the other end corresponding to the fixation element  20 , and the locating element  30  is a cup structure for this embodiment. The locating element  30  comprises an indented plane  32 , an open groove  33  disposed on the indented plane  32 , an embedded groove  321  disposed on the periphery of the indented plane  32 , a locating member  34  disposed on plane  32  and attached onto the embedded groove  321 , and a through hole disposed on the locating member  34  corresponding to the open groove  33  as shown in  FIG. 5 . 
   Please refer to  FIGS. 7 ,  8  and  9 . The clamping base comprises a broach  40 , a support rod  41  disposed on the broach  40 , a locating member  44  disposed on the support rod  41 , a rotary base  42  coupled to an end of the support rod  41 , a sleeve  43  disposed on the other end of the support rod  41 , and a serration  431  disposed at the periphery of an open end of the sleeve  43 . 
   Please refer to  FIGS. 3 to 10  for using. The connected ends of the semicircular rings  21  of the fixation element  20  are opened first as shown in  FIG. 3 , and the fixation element  2  is sheathed onto the femoral neck, and the embedded body  23  on one semicircular ring  21  is latched into the serration  241  of the serrated bar  24  of another semicircular ring  21  according to the size of the injured femur, so that the fixation element  20  can be secured onto the femur as shown in  FIG. 4 , and then the locating member  34  is embedded on the locating element  30  as shown in  FIG. 5 . A boring head  50  passes through a through hole  341  and implanted deeply into the surface of the femur, so that the boring head  50  can rotate at a fixed position under the limitation of the through hole  341  and drill a hole at the center of the femur to a predetermined depth as shown in  FIG. 6 . 
   Later, the boring head  50  is withdrawn from the femur to move the locating element  30  outward as shown in  FIG. 7  and the sleeve  43  of the broach  41  connects to the periphery of the femoral neck, and the locating element  30  returns to its original position to move the locating member  44  on the support rod  42  to a position corresponding to the locating element  30 . In the meantime, the locating member  44  embedded in the plane  32  of the locating element  30 , so that the broach  40  can used the center of the locating element  30  for carrying out the grinding and rotate the sleeve  43  under the limitation of the open groove  33  of the locating element  30 . As a result, the serrations  431  at the sleeve  43  disposed on the periphery of femur cut and grind the femur into a required shape as shown in  FIG. 8 . Then, the clamping base  10  and the broach  40  are removed from the femur as shown in  FIG. 9  to allow the surgeon to fit the protecting femoral neck device  60  onto the femur as shown in  FIG. 10 . The present invention has the simple-to-use and easy-to-install functions. 
   In summation of the description above, the present invention overcomes the shortcomings of the prior-art and enhances the performance than the conventional structure and further complies with the patent application requirements and is submitted to the Patent Office for review and granting of the commensurate patent rights. 
   While the invention has been described by way of example and in terms of a preferred embodiment, it is to be understood that the invention is not limited thereto. To the contrary, it is intended to cover various modifications and similar arrangements and procedures, and the scope of the appended claims therefore should be accorded the broadest interpretation so as to encompass all such modifications and similar arrangements.