Abstract:
This invention relates to a bone fixation device, and more particularly to a bone fixation device being injectable with medical fillings, comprising: a hollow fixation part having a joining end at a proximal end thereof, and an injecting end at a distal end thereof; a cover part being joined with the injecting end of said hollow fixation part; a medical filling being forceable and/or injectable via the injecting end of said hollow fixation part and into said cover part, such that the medical filling is allowed to become lump-like after injecting.

Description:
FIELD OF THE INVENTION 
       [0001]    This invention relates to a bone fixation device, and more particularly to a bone fixation device being injectable with medical fillings. 
       DESCRIPTION OF PRIOR ART 
       [0002]    Traditionally, bone fixation devices are designed differently according to various purposes, as exemplified by the bone nails found in spine fixation devices (refer to Taiwan Patent No. 250680, Component No. 20), the inner bone nails used in long bone fixation devices (refer to Taiwan Patent No. M316059, Component No. 3), as well as the screws used in artificial hip joints (please refer to Taiwan Patent No. 153907 and 245118, Component No. 30), all of which are structurally different from each other. However, none of said bone nails found in spine fixation devices, said inner bone nails found in long bone fixation devices, or said screws used in artificial hip joints can be integrally combined with the cancellous bones from the sites awaiting surgical fixation. For instance, for the bone nails found in spine fixation devices, the bone nails are inserted and secured into a vertebra simply by allowing the spaces between the crests on each nail to fit into the external cortical bone and the internal cancellous bone of said vertebra. Therefore, the bone nails could become loosened from the surgical sites due to losses of bone mass for the bone nails to hold onto, caused by changes in affected patients&#39; weight, activities, bone growth, severe osteoporosis (which is the loss of cancellous bone), or other factors. 
         [0003]    In order to resolve the aforesaid shortcomings, a number of patents had modified the bone nails structurally to enhance the stability thereof. For example, in the patent EP0714643, the bone nails have threads disposed thereon, so as to increase the contact area between the bone nails and the bones; in the patent DE19801219, hardened barb-like protrusions are arranged surroundingly on a perimeter of each bone nail, so that the brab-like protrusions can secure the bone nails against loosening. Similar examples can also be found in Taiwan Patent No. 200716052, which also utilizes barbs to prevent the bone nails from loosening from bones; as well as in Taiwan Patent No. M306498, which applies the concept of expansive screws on the bone nails, so that the bone nails can be secured in bones more effectively and firmly. Overall, the aforesaid patents aimed to reduce the incidence of bone nails loosened from bones after surgery by structurally enhancing the bone nails. However, said incidents still occur and do greater damage to the affected patients, due to the fact that most of the bone nails are made of metal, which are structurally stronger than bones, and often leads to loosening of bone nails from bones after the bones become worn off by the nails. 
         [0004]    In known prior arts, bone cement and bone nails are used in combination on patients suffering from osteoporosis, in which bone cement is injected into a patient&#39;s bone first, and then a bone nail is screwed through a bone plate and into the bone injected with the bone cement. As the bone nail is screwed into the bone, spaces between the superficial threads of the bone nail and the bone are filled up by the bone cement, so as to further secure the bone nail within the bone when the bone cement becomes solidified. But the solidification of bone cement could also prevent the body of bone nail from completely entering into the bone, or conversely becomes damaged when bone nail is entered, which would result in the loosening of bone nail and bone plate in both cases. 
         [0005]    In Taiwan Patents M306498, M346406, 267342, or other similar patents, a medical filling such as bone cement is injected via an opening disposed on a hollow bone nail, wherein the medical filling is usually a bone cement being made into a pulp-like form before surgery, and becomes solidified after surgery, so as to stabilize the bone nail after being injected into surgical sites. But in actual applications, the injected bone cement often accumulates or even forms spikes around small openings due to high viscosity thereof. As a result, the affected surgical site cannot grow more bone mass for the bone nail to hold onto, which restricts the stability of the bone nail consequently. 
         [0006]    In the bone fixation device of the present invention, a hollow fixation part has a cover part joined therewith, which may be used to limit the scope for injecting a medical filling, such that the medical filling is allowed to form a lump-like structure with said cover part after being injected; said lump-like structure then further fixes the bone fixation device of this invention onto a surgical site awaiting fixation (such as a vertebra, a hip joint, or a long bone). 
       SUMMARY OF THE INVENTION 
       [0007]    A primary objective of the invention is to provide a bone fixation device. 
         [0008]    Another objective of the invention is to provide a bone fixation device having a cover part, and being injectable with a medical filling via a hollow fixation part thereof. 
         [0009]    Yet another objective of the invention is to provide a bone fixation device in which said cover part may be expanded after a medical filling is injected thereinto. 
         [0010]    Yet another objective of the invention is to provide a bone fixation device in which said medical filling may be injected into a cover part thereof, and subsequently becomes solidified and secured on bones. 
         [0011]    Still another objective of the invention is to provide a bone fixation device having a cover part that may limit the scope for injecting a medical filling. 
         [0012]    Yet another objective of the invention is to provide a bone fixation device having a cover part that may form a lump-like structure with a medical filling, after the medical filling is injected. 
         [0013]    A further objective of the invention is to provide a spine fixation system using bone joining devices to join with bone fixation devices. 
         [0014]    Yet another objective of the invention is to provide an artificial hip joint replacement system using hip joint substitutes and acetabular implants to join with bone fixation devices. 
         [0015]    Still another objective of the invention is to provide a long bone fixation system using tightening devices to join with a plurality of bone fixation devices. 
         [0016]    The bone fixation device of the present invention, comprising:
       a hollow fixation part having a joining end at a proximal end thereof, and an injecting end at a distal end thereof;   a cover part being joined with the injecting end of said hollow fixation part;   a medical filling being forceable and/or injectable via the injecting end of said hollow fixation part and into said cover part, such that the medical filling is allowed to become lump-like after injecting.       
 
         [0020]    The joining end of said hollow fixation part, which can be used to join with any known bone joining devices (such as the joining rods or the bone plates used for spine fixation devices, and the acetabular implants used for artificial hip joint replacement devices), or any known tightening devices (such as the nuts used for long bone fixation devices), such that after injecting a medical filling, said bone fixation device secures bones of surgical sites to the expanded and solidified cover part, as well as fitting said bones to the bone joining device at the joining end of said hollow fixation part, thereby enhancing the stability of said bone fixation device. 
         [0021]    The joining end of said hollow fixation part, which may further comprise a tightening mechanism when joined with known bone joining devices. When joined with the bone joining devices, said tightening mechanism may be used to adjust distances between the bone joining devices and lump-like medical fillings, so as to strengthen the stability of said bone fixation devices. 
         [0022]    The joining end of said hollow fixation part, which can be joined with bone joining devices (including tightening mechanisms if necessary) or tightening devices by using any known methods of joining, such as by the formation into a unibody (refer to  FIGS. 3   b ,  3   c ,  3   d , and  3   e ), locking, clasping, or screwing. 
         [0023]    In said hollow fixation part, a body between the joining end and the injecting end may include various textures like: annular textures, striped textures, speckled textures, or mesh-like textures (refer to  FIGS. 3   b ,  3   c , and  3   d ); so as to increase the friction between said hollow fixation part and bones, thus preventing said hollow fixation part from loosening after surgery. 
         [0024]    The injecting end of said hollow fixation part, which may be of any known configurations, such as an injecting end having multiple slits or holes (refer to  FIGS. 5   b  and  5   c ), and is more preferably configured with multiple slits. 
         [0025]    Said cover part may be secured to the body, the injecting end, or the joining end of said hollow fixation part, and is more preferably secured to the body. 
         [0026]    Said hollow fixation part and said cover part may be joined together by using any known methods of joining. As the body of said hollow fixation part has an annular trough disposed thereon, and the annular trough is used to secure said cover part to the body of said hollow fixation part, wherein the cover part may be secured to the annular trough by using any known methods of joining, such as by riveting, clasping, locking, adhering, or binding (refer to  FIGS. 8   a ,  8   b ,  8   c , and  8   d ), and is more preferably secured by riveting or clasping. 
         [0027]    Said cover part may completely or partially cover the injecting end of said hollow fixation part. 
         [0028]    Said cover part may be of any known cover parts, such as elastic cover parts, mesh-like cover parts, porous cover parts, or metal cover parts (refer to  FIGS. 7   a ,  7   b ,  7   c , and  7   d ). 
         [0029]    Said cover part may be of any shapes, such as cylindrical, cone-like, ball-like, quasi-balls, or quasi-cubes. 
         [0030]    Said medical filling is allowed to become lump-like after injecting, wherein said lump-like structure may be of any known shapes, such as cylindrical, cone-like, ball-like, quasi-balls, or quasi-cubes, and is more preferably cylindrical. 
         [0031]    Said medical filling may be any known medical fillings, such as bone grafts, bone substitutes, bone cement, and/or a mixture, a composition, a composite thereof, as referred to in TW-097141700, TW-I227146, and U.S. Pat. No. 20070088436. Generally, said medical filling could be as simple as bone grafts like autografts or allografts, but this result in relatively less secure fixation of bones. Therefore, said medical filling is more preferably to include at least a pulp that can become solidified, such as a pulp-like medical filling, or be filled with said bone grafts and then injected with a solidifiable pulp, such that the pulp is allowed to completely fill up or even slightly expand the lump-like structure, so as to strengthen joining thereof. Said medical filling is most preferably to be a pulp-like medical filling. The pulp-like medical filling refers to a medical filling that can be made into a pulp during or before actual use, and become solidified within an adequate amount of time after being injecting into the lump-like structure. For example, this may include the aforesaid bone substitutes, bone cement, and/or a mixture, a composition, a composite thereof. Said medical filling is preferably to be osteo-conductive and/or osteo-inductive, such as the known HA type of bone fillings, and is more preferably to be osteo-inductive like the SrHA type of medical fillings, as referred to in TW-097141700. Anyone of ordinary skill in the art knows that in addition to the known medical fillings, the above-described medical filling may be substituted with any medical fillings reconstituted or modified from any known medical fillings, or with any newly developed medical fillings having equivalent effects. 
         [0032]    Said hollow fixation part may be made of a single section or a combination of multiple sections. A single-section hollow fixation part is hollow throughout the section; whereas a multiple-section fixation part has a hollow distal injecting end, and other ends may be hollow or solid (refer to  FIG. 2   b ). Each of the sections may be joined together by using any known methods of joining, such as by locking, clasping, or screwing (refer to  FIGS. 6   b  and  6   c ). 
         [0033]    Said bone fixation device may be used in combination with a bone joining device, in order to make up a spine fixation system (refer to  FIG. 15 ), which is the spine fixation system of the present invention, comprising:
       a plurality of fixation parts having joining ends at proximal ends thereof, and distal ends thereof are used to secure vertebrae awaiting fixation;   a bone joining device joined with the joining end of said fixation part; characterized in that:       
 
         [0036]    Said fixation part includes at least one hollow fixation part having a joining end at a proximal end thereof, and an injecting end at a distal end thereof; at least one said hollow fixation part being further joined with a cover part, so as to force or inject a medical filling via the injecting end of said hollow fixation part and into said cover part, such that the medical filling is allowed to become lump-like after injecting. 
         [0037]    Said fixation part may be any known fixation parts, such as bone nails, screws, and/or hollow fixation parts, as referred to in the following diagrams and descriptions thereof. 
         [0038]    Said bone joining device may be any known bone joining devices, which may be a single part like a bone plate, or made up of a plurality of parts like joining rods, tightening devices, receiving troughs, rods, or barbs (refer to  FIGS. 4   a ,  4   b ,  4   c ,  4   d , and  4   e ). 
         [0039]    The above-described hollow fixation part, cover part, and medical filling are as described before. 
         [0040]    The present invention also discloses a method for operating on a spine, comprising the steps of:
   (1) creating a hole on a vertebra;   (2) placing said hollow fixation part and said cover part joined therewith into the hole, and leaving the joining end of said hollow fixation part outside of the vertebra and exposed;   (3) injecting said medical filling into said cover part via an injecting device and said hollow fixation part;   (4) injecting said medical filling so that said medical filling and the cover part together form a lump;   (5) removing said injecting device from said hollow fixation part.   
 
         [0046]    Said step (1) may utilize any known steps for creating holes, an example of which can be referred to in TW-557785. 
         [0047]    Said step (2) may use any known steps for placing, such as using a tube to place said hollow fixation part and said cover part joined therewith into the hole, as indicated in  FIG. 10   a , or directly placing the spine fixation system into the hole, as indicated in  FIG. 12   a.    
         [0048]    Preferably, said injecting device is joined with the joining end of said hollow fixation part, as shown in  FIG. 10   a.    
         [0049]    Said steps (3) and (4) may use any known steps for injecting, characterized in that the cover part is used to limit a scope for injecting the medical filling. 
         [0050]    Said step (5) may use any known steps for removing injecting devices. 
         [0051]    The method of this invention may further comprise a step (6), in which a bone joining device is joined with the joining end of said hollow fixation part. 
         [0052]    Said bone fixation device may be used in combination with a hip joint substitute and an acetabular implant to form an artificial hip joint replacement, system (refer to  FIGS. 16   a ,  16   b ,  17 ,  18 ,  19 ,  20 ,  21 ,  22   a , and  22   b ), which is the artificial hip joint replacement system of this invention, comprising:
       a hollow fixation part having a joining end at a proximal end thereof, and an injecting end at a distal end thereof;   a cover part being joined with the injecting end of said hollow fixation part;   a hip joint substitute being joined with the hollow fixation part, and is used for covering over a pre-finished femur;   an acetabular implant being joined with the joining end of said hollow fixation part; and   a medical filling being forceable and/or injectable via the injecting end of said hollow fixation part and into said cover part, such that the medical filling is allowed to become lump-like after injecting.       
 
         [0058]    Said hollow fixation part allows said artificial hip joint replacement system to secure bones of surgical sites to the expanded and solidified cover part after injecting the medical filling, and the joining of said hollow fixation part with a tightening device further stabilizes said artificial hip joint replacement system. 
         [0059]    Said hollow fixation part can be joined with hip joint substitutes by using any known methods of joining, such as by the formation into a unibody (refer to  FIG. 16   a ), adhering, locking, clasping, or screwing. 
         [0060]    Said cover part may further include a halting part for allowing a guiding device to go through the injecting end of said hollow fixation part. Said guiding device pushes against the halting part such that said cover part is guided into an injecting position when inserted into a bone, and is not squeezed or collapsed. 
         [0061]    Said hip joint substitute may be any known hip joint substitutes, like the ones described in the Taiwan Patent No. 245118 and I53907. 
         [0062]    Said hip joint substitute may be joined with tightening devices by using any known methods of joining, such as by locking, clasping, or screwing. 
         [0063]    Said acetabular implant may be any known acetabular implants, like the ones described in the Taiwan Patent No. 245118 and I53907. 
         [0064]    Said artificial hip joint replacement system may further include a plurality of hollow fixation parts and cover parts (refer to  FIG. 22   a ), which are also injected with a medical filling so as to strengthen the stability of said artificial hip joint replacement system. 
         [0065]    Said artificial hip joint replacement system may further include a supplementary fixation device for further strengthening the stability thereof, which can be a securing cable, a bone plate, a joining rod, a bone nail, a screw, a rod, or a barb. 
         [0066]    Said hip joint replacement system may be joined with the supplementary fixation device by using any known methods of joining, such as by locking, clasping, or screwing. 
         [0067]    The above-described hollow fixation part, cover part, and medical filling are as described before. 
         [0068]    Said bone fixation device may also be used in combination with a tightening device to form a long bone fixation system (refer to  FIGS. 23-28  and  29   a - 29   k ), which is the long bone fixation system of the present invention, comprising:
       a hollow fixation part having a joining end at a proximal end thereof, and an injecting end at a distal end thereof;   a cover part being joined with the injecting end of said hollow fixation part;   a medical filling being forceable and/or injectable via the injecting end of said hollow fixation part and into said cover part, such that the medical filling is allowed to become lump-like after injecting; and   a tightening device being joined with the joining end of said hollow fixation part, so as to tighten the lump-like cover part against the bones of surgical sites.       
 
         [0073]    Said tightening device may be any known tightening devices, as long as it can be used to tighten the lump-like cover part against the bones of surgical sites and strengthen the stability of said long bone fixation system, such as screws and bone plates/screws (refer to  FIG. 25 ). 
         [0074]    The joining end of said hollow fixation part may be used to join with any known tightening devices, such that said long bone fixation system secures the bones of surgical sites to the expanded and solidified cover part, and the bone joining device fitted on the joining end of said hollow fixation part after injecting the medical filling, so as to enhance the stability of said long bone fixation system. 
         [0075]    The joining end of said hollow fixation part may be joined with the tightening devices by using any known methods of joining, such as by locking, clasping, or screwing. 
         [0076]    Said cover part may further include a halting part for allowing a guiding device to go through the injecting end of said hollow fixation part. Said guiding device pushes against the halting part so that said cover part is guided into an injecting position when inserted into a bone, and is not squeezed or collapsed. 
         [0077]    Said hollow fixation part may further include a second cover part, which can be joined with the body of the hollow fixation part, thus further strengthening the coupling between two broken bones (refer to  FIG. 28 ). 
         [0078]    Said long bone fixation system may further include a supplementary fixation device for further strengthening the stability thereof, which can be a bone plate, a joining rod, a bone nail, a screw, a rod, or a barb. 
     
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         [0079]      FIG. 1   a  is a schematic view showing a fully assembled bone fixation device according to a preferred embodiment of the present invention. 
           [0080]      FIG. 1   b  is a schematic view showing the bone fixation device of  FIG. 1   a  after injecting is completed. 
           [0081]      FIG. 2   a  is a schematic view showing a fully disassembled bone fixation device according to a preferred embodiment of the present invention. 
           [0082]      FIG. 2   b  is a schematic view showing a fully disassembled bone fixation device according to another preferred embodiment of the present invention. 
           [0083]      FIGS. 3   a ,  3   b ,  3   c ,  3   d , and  3   e  are schematic views showing five different types of body texture for a hollow fixation part of the bone fixation device of the present invention. 
           [0084]      FIGS. 4   a ,  4   b ,  4   c ,  4   d , and  4   e  are schematic views showing the joining between the hollow fixation device of the bone fixation device with four types of bone joining device according to a preferred embodiment of the present invention. 
           [0085]      FIGS. 5   a ,  5   b , and  5   c  are schematic views showing three types of injecting end of the hollow fixation device of the bone fixation device according to a preferred embodiment of the present invention. 
           [0086]      FIGS. 6   a ,  6   b , and  6   c  are schematic views showing three types of coupling for the hollow fixation device of the bone fixation device according to a preferred embodiment of the present invention. 
           [0087]      FIGS. 7   a ,  7   b ,  7   c , and  7   d  are schematic views showing four types of cover part for the bone fixation device according to a preferred embodiment of the present invention. 
           [0088]      FIGS. 8   a ,  8   b ,  8   c , and  8   d  are schematic views showing the joining between four types of cover part with the hollow fixation part of the bone fixation device according to a preferred embodiment of the present invention. 
           [0089]      FIGS. 9   a ,  9   b , and  9   c  are schematic views showing the joining between three types of metal cover part with the hollow fixation device of the bone fixation device according to a preferred embodiment of the present invention. 
           [0090]      FIGS. 10   a ,  10   b ,  10   c ,  10   d ,  10   e , and  10   f  are schematic views showing the surgical steps for joining the bone fixation device of the invention with a bone joining device. 
           [0091]      FIGS. 11   a ,  11   b , and  11   c  are schematic views showing the joining between the bone fixation device of the invention with a bone joining device having a tightening mechanism. 
           [0092]      FIGS. 12   a ,  12   b , and  12   c  are schematic views showing the surgical steps for joining the bone fixation device of the invention with a cover part made of PET. 
           [0093]      FIGS. 13   a ,  13   b ,  13   c ,  13   d , and  13   e  are schematic views showing the surgical steps for joining the bone fixation device of the invention with a bone joining device having a tightening mechanism. 
           [0094]      FIGS. 14   a ,  14   b , and  14   c  are schematic views showing the surgical steps for joining the bone fixation device of the invention with an elastic metal cover part. 
           [0095]      FIG. 15  is a schematic view showing a spine fixation system comprised of the bone fixation device of the invention in combination with a bone joining device. 
           [0096]      FIG. 16   a  is a schematic view showing a hip joint replacement system comprising the bone fixation device being joined with a hip joint substitute and an acetabular implant, according to a preferred embodiment of the present invention. 
           [0097]      FIG. 16   b  is a schematic view showing the system of  FIG. 16   a  after injecting is completed according to a preferred embodiment of the present invention. 
           [0098]      FIG. 17  is a schematic view showing an artificial hip joint replacement system comprising the bone fixation device being joined with a hip joint substitute and an acetabular implant, according to another preferred embodiment of the present invention. 
           [0099]      FIG. 18  is a schematic view showing an artificial hip joint replacement system comprising the bone fixation device being joined with a hip joint substitute and an acetabular implant, according to yet another preferred embodiment of the present invention. 
           [0100]      FIG. 19  is a schematic view showing an artificial hip joint replacement system comprising the bone fixation device being joined with a hip joint substitute and an acetabular implant, according to still another preferred embodiment of the present invention. 
           [0101]      FIG. 20  is a schematic view showing an artificial hip joint replacement system comprising the bone fixation device being joined with a hip joint substitute and an acetabular implant, according to a further preferred embodiment of the present invention. 
           [0102]      FIG. 21  is a schematic view showing an artificial hip joint replacement system comprising the bone fixation device being joined with a hip joint substitute and an acetabular implant, according to yet another preferred embodiment of the present invention. 
           [0103]      FIG. 22   a  is a schematic view showing an artificial hip joint replacement system comprising the bone fixation device being joined with a hip joint substitute and an acetabular implant, according to still another preferred embodiment of the present invention. 
           [0104]      FIG. 22   b  is a schematic view showing the system of  FIG. 22   a  from another angle of view. 
           [0105]      FIG. 23  is a schematic view showing a long bone fixation system comprising the bone fixation device being joined with a tightening device, according to a preferred embodiment of the present invention. 
           [0106]      FIG. 24  is a schematic view showing a long bone fixation system comprising the bone fixation device being joined with a tightening device, according to another preferred embodiment of the present invention. 
           [0107]      FIG. 25  is a schematic view showing a long bone fixation system comprising the bone fixation device being joined with a tightening device, according to yet another preferred embodiment of the present invention. 
           [0108]      FIG. 26  is a schematic view showing a long bone fixation system comprising the bone fixation device being joined with a tightening device, according to yet another preferred embodiment of the present invention. 
           [0109]      FIG. 27  is a schematic view showing a long bone fixation system comprising the bone fixation device being joined with a tightening device, according to still another preferred embodiment of the present invention. 
           [0110]      FIG. 28  is a schematic view showing a long bone fixation system comprising the bone fixation device being joined with a tightening device, according to a further preferred embodiment of the present invention. 
           [0111]      FIGS. 29   a  to  29   k  are schematic views showing the surgical steps for installing the long bone fixation system of the invention. 
       
    
    
     DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS 
       [0112]      FIG. 1   a  is a schematic view showing a fully assembled bone fixation device according to a preferred embodiment of the present invention. In which  100  is a hollow fixation part,  110  is a joining end,  120  is an injecting end,  130  is a body having a mesh-like texture superficially,  200  is a cover part,  210  is a securing ring, and  220  is a halting part. The hollow fixation part  100  is formed as a unibody, and the securing ring  210  is used to secure the cover part  200  to the body  130  of the hollow fixation part  100 . 
         [0113]      FIG. 1   b  is a schematic view showing the bone fixation device of  FIG. 1   a  after injecting is completed. In which  100  is a hollow fixation part,  110  is a joining end,  120  is an injecting end,  130  is a body,  200  is a cover part,  210  is a securing ring,  220  is a halting part, and  300  is a medical filling. Wherein the medical filling  300  is injected into the cover part  200  via the injecting end  120  of the hollow fixation part  100 , and the medical filling  300  is allowed to completely fill up the cover part  200  and become lump-like. 
         [0114]      FIG. 2   a  is a schematic view showing a fully disassembled bone fixation device according to a preferred embodiment of the present invention. In which  100  is a hollow fixation part,  110  is a joining end,  120  is an injecting end,  130  is a body,  131  is an annular trough,  200  is a cover part,  210  is a securing ring,  220  is a halting part,  221  is an anterior halting component, and  222  is a posterior halting component. Moreover, the securing ring  210  is used to secure the cover part  200  to the annular trough  131  of the hollow fixation part  100 . 
         [0115]      FIG. 2   b  is a schematic view showing a fully disassembled bone fixation device according to another preferred embodiment of the present invention. In which  110  is a joining end,  111  is a coupling end of the joining end  110 ,  120  is an injecting end,  121  is a coupling end of the injecting end  120 ,  131  is an annular trough,  200  is a cover part,  210  is a securing ring,  220  is a halting part,  221  is an anterior halting component, and  222  is a posterior halting component. Wherein the hollow fixation part is divided into two portions including the joining end  110  and the injecting end  120 , and the joining end  110  and the injecting end  120  are joined together by screwing. Moreover, the securing ring  210  is used to secure the cover part  200  to the annular trough  131  of the hollow fixation part  100 . 
         [0116]      FIGS. 3   a ,  3   b ,  3   c ,  3   d , and  3   e  are schematic views showing five different types of body texture for a hollow fixation part of the bone fixation device of the present invention.  FIG. 3   a  shows: A bone joining device  400  and a hollow fixation part are formed as a unibody, a body  130  having no textures, an injecting end  120  having a plurality of holes for injecting a medical filling into a cover part via the injecting end  120 .  FIG. 3   b  shows: A bone joining device  400  and a hollow fixation part are formed as a unibody, a body  130  having an annular texture, an injecting end  120  having a plurality of holes for injecting a medical filling into a cover part via the injecting end  120 .  FIG. 3   c  shows: A bone joining device  400  and a hollow fixation part are formed as a unibody, a body  130  having a striped texture, an injecting end  120  having a plurality of holes for injecting a medical filling into a cover part via the injecting end  120 .  FIG. 3   d  shows: A bone joining device  400  and a hollow fixation part are formed as a unibody, a body  130  having a speckled texture, an injecting end  120  having a plurality of holes for injecting a medical filling into a cover part via the injecting end  120 .  FIG. 3   e  shows: A bone joining device  400  and a hollow fixation part are formed as a unibody, a body  130  having a mesh-like texture, an injecting end  120  having a plurality of holes for injecting a medical filling into a cover part via the injecting end  120 . 
         [0117]      FIGS. 4   a ,  4   b ,  4   c ,  4   d , and  4   e  are schematic views showing the joining between the bone fixation device with four types of bone joining device to form a spine fixation system, according to a preferred embodiment of the present invention.  FIG. 4   a  shows: A bone joining device  400  being a receiving trough and may be screwed together with a hollow fixation part, a body  130  having a mesh-like texture, an injecting end  120  having a plurality of holes for injecting a medical filling into a cover part via the injecting end  120 .  FIG. 4   b  shows: A bone joining device  400  being a joining rod and may be screwed together with a hollow fixation part, a body  130  having a mesh-like texture, an injecting end  120  having a plurality of holes for injecting a medical filling into a cover part via the injecting end  120 .  FIG. 4   c  shows: A bone joining device  400  being a joining rod, the joining rod  400  is joined with a tightening device  420  and may be screwed together with a hollow fixation part, a body  130  having a mesh-like texture, an injecting end  120  having a plurality of holes for injecting a medical filling into a cover part via the injecting end  120 .  FIG. 4   d  shows: A bone joining device  400  being a bone plate and may be screwed together with a hollow fixation part, a body  130  having a mesh-like texture, an injecting end  120  having a plurality of holes for injecting a medical filling into a cover part via the injecting end  120 .  FIG. 4   e  shows: A bone joining device  400  being a receiving trough, the receiving trough  400  is joined with holders  430  by using rods  500 , and may be screwed together with hollow fixation parts, a body  130  having a mesh-like texture, an injecting end  120  having a plurality of holes for injecting a medical filling into a cover part via the injecting end  120 . 
         [0118]      FIGS. 5   a ,  5   b , and  5   c  are schematic views showing three types of injecting end of the hollow fixation device of the bone fixation device according to a preferred embodiment of the present invention. Wherein  100  is a hollow fixation part, and  120  is an injecting end.  FIG. 5   a  shows: The injecting end  120  having no holes or slits.  FIG. 5   b  shows: The injecting end  120  having a plurality of slits for injecting a medical filling into a cover part via the injecting end  120 .  FIG. 5   c  shows: The injecting end  120  having a plurality of holes for injecting a medical filling into a cover part via the injecting end  120 . 
         [0119]      FIGS. 6   a ,  6   b , and  6   c  are schematic views showing three types of coupling for the hollow fixation device of the bone fixation device according to a preferred embodiment of the present invention. Wherein  100  is a hollow fixation part,  110  is a joining end,  111  is a coupling end of the joining end  110 ,  120  is an injecting end, and  121  is a coupling end of the injecting end  120 .  FIG. 6   a  shows: The hollow fixation part  100  being formed as a unibody.  FIG. 6   b  shows: The joining end  110  being coupled to the injecting end  120  by screwing.  FIG. 6   c  shows: The joining end  110  being coupled to the injecting end  120  by clasping. 
         [0120]      FIGS. 7   a ,  7   b ,  7   c , and  7   d  are schematic views showing four types of cover part for the bone fixation device according to a preferred embodiment of the present invention. Wherein  200  is a cover part.  FIG. 7   a  shows: The cover part  200  being mesh-like.  FIG. 7   b  shows: The cover part  200  being made of PET materials.  FIG. 7   c  shows: The cover part  200  being made of metal.  FIG. 7   d  shows: The cover part  200  being elastic. 
         [0121]      FIGS. 8   a ,  8   b ,  8   c , and  8   d  are schematic views showing the joining between four types of cover part with the hollow fixation part of the bone fixation device according to a preferred embodiment of the present invention. Wherein  130  is a body,  200  is a cover part, and  210  is a securing ring.  FIG. 8   a  shows: The body  130  being coupled to the cover part  200  by riveting.  FIG. 8   b  shows: The body  130  being coupled to the cover part  200  by screwing.  FIG. 8   c  shows: The body  130  being coupled to the cover part  200  by tightening.  FIG. 8   d  shows: The body  130  being coupled to the cover part  200  by binding. 
         [0122]      FIGS. 9   a ,  9   b , and  9   c  are schematic views showing the joining between three types of metal cover part with the hollow fixation device of the bone fixation device according to a preferred embodiment of the present invention. Wherein  130  is a body,  200  is a cover part, and  210  is a securing ring.  FIG. 9   a  shows: The cover part  200  being made of metal, and the body  130  being coupled to the cover part  200  by riveting.  FIG. 9   b  shows: The cover part  200  being made of metal, and the body  130  being coupled to the cover part  200  by screwing.  FIG. 9   c  shows: The cover part  200  being made of metal, and the body  130  being coupled to the cover part  200  by tightening. 
         [0123]      FIGS. 10   a ,  10   b ,  10   c ,  10   d ,  10   e , and  10   f  are schematic views showing the surgical steps for joining the bone fixation device of the invention with a bone joining device. Wherein  100  is a hollow fixation part,  120  is an injecting end,  200  is a cover part,  300  is a medical filling,  400  is a bone joining device,  410  is a coupling end,  600  is a tube,  700  is an injecting device,  800  is a vertebra, and  900  is a combined device.  FIG. 10   a  shows: The injecting device  700 , the hollow fixation part  100 , and the cover part  200  are sequentially placed into the tube  600 , and then the tube  600  is implanted into the vertebra  800  where a hole has been created.  FIG. 10   b  shows: The injecting device  700 , the hollow fixation part  100 , and the cover part  200  are implanted into the vertebra  800  where a hole has been created, then the tube  600  is removed.  FIG. 10   c  shows: The medical filling  300  is subsequently injected into the hollow fixation part  100  via the injecting device  700 , and then into the cover part  200  via the injecting end  120 .  FIG. 10   d  shows: The medical filling  300  and the cover part  200  have become lump-like.  FIG. 10   e  shows: After injecting is completed, the injecting device  700  is removed.  FIG. 10   f  shows: The bone joining device  400  is then locked into the hollow fixation part  100 . 
         [0124]      FIGS. 11   a ,  11   b , and  11   c  are schematic views showing the joining between the bone fixation device of the invention with a bone joining device having a tightening mechanism. Wherein  100  is a hollow fixation part,  300  is a medical filling, and  400  is a bone joining device.  FIG. 11   a  shows: The lump-like medical filling  300  fixes a spine fixation system on the vertebra along with a unibody of the hollow fixation part  100  and the bone joining device  400 .  FIG. 11   b  shows: The spine fixation system fixes itself on the vertebra by using a clasping-type tightening mechanism between the hollow fixation part  100  and the bone joining device  400 .  FIG. 11   c  shows: The spine fixation system fixes itself on the vertebra by using a screwing-type tightening mechanism between the hollow fixation part  100  and the bone joining device  400 . 
         [0125]      FIGS. 12   a ,  12   b , and  12   c  are schematic views showing the surgical steps for joining the bone fixation device of the invention with a cover part made of PET. Wherein  100  is a hollow fixation part,  120  is an injecting end,  300  is a medical filling,  700  is an injecting device, and  800  is a vertebra.  FIG. 12   a  shows: The hollow fixation part  100  is implanted into the vertebra  800  where a hole has been created by employing the injecting device  700 .  FIG. 12   b  shows: The medical filling  300  is subsequently injected into the hollow fixation part  100  via the injecting device  700 , and then into the cover part via the injecting end  120 .  FIG. 12   c  shows: The medical filling  300  has become lump-like completely. 
         [0126]      FIGS. 13   a ,  13   b ,  13   c ,  13   d , and  13   e  are schematic views showing the surgical steps for joining the bone fixation device of the invention with a bone joining device having a tightening mechanism. Wherein  100  is a hollow fixation part,  200  is a cover part,  300  is a medical filling,  400  is a bone joining device,  700  is an injecting device,  800  is a vertebra, and  900  is a combined device.  FIG. 13   a  shows: The hollow fixation part  100  is implanted into the vertebra  800  where a hole has been created by utilizing the injecting device  700 .  FIG. 13   b  shows: The medical filling  300  is then injected into the hollow fixation part  100  via the injecting device  700 , and then into the cover part via the injecting end.  FIG. 13   c  shows: The medical filling  300  has become lump-like completely.  FIG. 13   d  shows: The bone joining device  400  is then locked into the hollow fixation part  100 .  FIG. 13   e  shows: The bone joining device  400  has been fully combined into the hollow fixation part  100 . 
         [0127]      FIGS. 14   a ,  14   b , and  14   c  are schematic views showing the surgical steps for joining the bone fixation device of the invention with an elastic metal cover part. Wherein  100  is a hollow fixation part,  200  is a cover part,  300  is a medical filling,  400  is a bone joining device,  700  is an injecting device, and  800  is a vertebra.  FIG. 14   a  shows: The cover part  200  is made of metal, and the injecting device  700  is used to implant the hollow fixation part  100  into the vertebra  800  where a hole has been created.  FIG. 14   b  shows: The medical filling  300  is then injected into the hollow fixation part  100  via the injecting device  700 , and then into the metal cover part  200  via the injecting end, so as to push open the metal cover part.  FIG. 14   c  shows: The medical filling  300  has been completely injected and pushed open the metal cover part  200  so it becomes lump-like. 
         [0128]      FIG. 15  is a schematic view showing a spine fixation system comprising the bone fixation device of the invention being joined with a bone joining device. Wherein  100  is a hollow fixation part,  300  is a medical filling,  400  is a bone joining device,  500  is a rod, and  910  is a bone nail. The hollow fixation part  100  is joined to the bone nail  910  by using the bone joining device  400  and the rod  500 . 
         [0129]      FIG. 16   a  is a schematic view showing an artificial hip joint replacement system comprising the bone fixation device being joined with a hip joint substitute and an acetabular implant, according to a preferred embodiment of the present invention. Wherein  100  is a hollow fixation part,  200  is a cover part,  520  is a hip joint substitute,  620  is an acetabular implant,  820  is a hip joint, and  810  is a hole. The hollow fixation part  100  and the hip joint substitute  520  are formed as a unibody. During surgery, the hollow fixation part  100  and the cover part  200  are placed into the hole  810  of the hip joint  820  created beforehand. 
         [0130]      FIG. 16   b  is a schematic view showing the system of  FIG. 16   a  after injecting is completed according to a preferred embodiment of the present invention. Wherein  100  is a hollow fixation part,  200  is a cover part,  300  is a medical filling,  520  is a hip joint substitute,  620  is an acetabular implant, and  820  is a hip joint. Moreover, the medical filling  300  is injected into the cover part  200  via the injecting end of the hollow fixation part  100 , and the medical filling  300  is allowed to completely fill up the cover part  200  and become lump-like. 
         [0131]      FIG. 17  is a schematic view showing an artificial hip joint replacement system comprising the bone fixation device being joined with a hip joint substitute and an acetabular implant, according to another preferred embodiment of the present invention. Wherein  110  is a joining end,  120  is an injecting end,  200  is a cover part,  520  is a hip joint substitute,  620  is an acetabular implant, and  820  is a hip joint. A hollow fixation part and the hip joint substitute  520  are formed as two parts and joined together by screwing. During surgery, the hollow fixation part  100  and the cover part  200  are placed into the hole  810  of the hip joint  820  created beforehand. 
         [0132]      FIG. 18  is a schematic view showing an artificial hip joint replacement system comprising the bone fixation device being joined with a hip joint substitute and an acetabular implant, according to yet another preferred embodiment of the present invention. Wherein  100  is a hollow fixation part,  200  is a cover part,  300  is a medical filling,  520  is a hip joint substitute,  620  is an acetabular implant,  420  is a tightening device, and  820  is a hip joint. After injecting the medical filling into this artificial hip joint replacement system, a tightening device  420  is used to push and tighten the lump-like cover part toward the bone of surgical site. 
         [0133]      FIG. 19  is a schematic view showing an artificial hip joint replacement system comprising the bone fixation device being joined with a hip joint substitute and an acetabular implant, according to still another preferred embodiment of the present invention. Wherein  100  is a hollow fixation part,  200  is a cover part,  520  is a hip joint substitute,  620  is an acetabular implant,  710  is a first screw,  720  is a second screw,  730  is a plate,  820  is a hip joint, and  810  is a hole. After injecting the medical filling into this artificial hip joint replacement system, the first screw  710 , the second screw  720 , and the plate  730  are used to push and tighten the lump-like cover part toward the bone of surgical site. 
         [0134]      FIG. 20  is a schematic view showing an artificial hip joint replacement system of the invention being joined with screws and a securing cable, according to a preferred embodiment of the present invention. Wherein  100  is a hollow fixation part,  200  is a cover part,  520  is a hip joint substitute,  620  is an acetabular implant,  710  is a first screw,  720  is a second screw,  730  is a plate,  740  is a securing cable,  820  is a hip joint, and  810  is a hole. After injecting the medical filling into the artificial hip joint replacement system, the first screw  710 , the second screw  720 , the plate  730 , and the securing cable  740  are used to push and tighten the lump-like cover part toward the bone of surgical site. 
         [0135]      FIG. 21  is a schematic view showing an artificial hip joint replacement system of the invention being joined with screws, according to another preferred embodiment of the present invention. Wherein  100  is a hollow fixation part,  200  is a cover part,  520  is a hip joint substitute,  620  is an acetabular implant,  710  is a first screw,  711  is a first nut,  720  is a second screw,  721  is a second nut,  750  is a third screw,  820  is a hip joint, and  810  is a hole. After injecting the medical filling into the artificial hip joint replacement system, the first screw  710 , the second screw  720 , the first nut  711 , the second nut  721 , and the third screw  750  are used to push and tighten the lump-like cover part toward the bone of surgical site. 
         [0136]      FIG. 22   a  is a schematic view showing an artificial hip joint replacement system of the invention being joined with a second hollow fixation part, according to a preferred embodiment of the present invention Wherein  100  is a hollow fixation part,  200  is a cover part,  300  is a medical filling,  150  is a second hollow fixation part,  520  is a hip joint substitute,  820  is a hip joint, and  920  is a securing plate. The artificial hip joint replacement system is internally reinforced by using the second hollow fixation part  150  and the cover part to provide additional space for injecting the medical filling  300 , and also externally reinforced by further using the securing plate  920  and screws. 
         [0137]      FIG. 22   b  is a schematic view showing the system of  FIG. 22   a  from another angle of view. 
         [0138]      FIG. 23  is a schematic view showing a long bone fixation system comprising the bone fixation device being joined with a tightening device, according to a preferred embodiment of the present invention. Wherein  100  is a hollow fixation part,  200  is a cover part,  300  is a medical filling,  420  is a tightening device,  650  is a front broken bone,  660  is a rear broken bone, and  670  is a split. The hollow fixation part  100  and the cover part  200  are fitted through the rear broken bone  660 , the split  670 , and the front broken bone  650 , and the front and rear broken bones  650  and  660  are rejoined by injecting the medical filling  300 . The tightening device  420  is further employed to reinforce the joining between the front broken bone  650 , the rear broken bone  660 , and the hollow fixation part  100  in order to enhance the stability thereof. The surgical method thereof is further described in  FIGS. 29   a  to  29   k.    
         [0139]      FIG. 24  is a schematic view showing a long bone fixation system comprising the bone fixation device being joined with a tightening device, according to another preferred embodiment of the present invention. Wherein  100  is a hollow fixation part,  200  is a cover part,  300  is a medical filling,  420  is a tightening device,  650  is a front broken bone,  660  is a rear broken bone, and  670  is a split. The hollow fixation part  100  and the cover part  200  are fitted through the front broken bone  650 , the split  670 , and the rear broken bone  660 , and the front and rear broken bones  650  and  660  are rejoined by injecting the medical filling  300 . The tightening device  420  is further employed to reinforce the joining between the front broken bone  650 , the rear broken bone  660 , and the hollow fixation part  100  in order to enhance the stability thereof. The surgical method thereof is further described in  FIGS. 29   a  to  29   k.    
         [0140]      FIG. 25  is a schematic view showing a long bone fixation system comprising the bone fixation device being joined with a tightening device, according to yet another preferred embodiment of the present invention. Wherein  100  is a hollow fixation part,  200  is a cover part,  300  is a medical filling,  420  is a tightening device,  550  is a supplementary fixation device,  650  is a front broken bone,  660  is a rear broken bone, and  670  is a split. The hollow fixation part  100  and the cover part  200  are fitted through the supplementary fixation device  550 , the front broken bone  650 , the split  670 , and the rear broken bone  660 , and the front and rear broken bones  650  and  660  are rejoined by injecting the medical filling  300 . The tightening device  420  is further employed to reinforce the joining between the front broken bone  650 , the rear broken bone  660 , and the hollow fixation part  100  in order to enhance the stability thereof. The surgical method thereof is further described in  FIGS. 29   a  to  29   k.    
         [0141]      FIG. 26  is a schematic view showing a long bone fixation system comprising the bone fixation device being joined with a tightening device, according to yet another preferred embodiment of the present invention. Wherein  100  is a hollow fixation part,  200  is a cover part,  300  is a medical filling,  420  is a tightening device,  650  is a front broken bone,  660  is a rear broken bone, and  670  is a split. The hollow fixation part  100  and the cover part  200  are fitted through the front broken bone  650 , the split  670 , and the rear broken bone  660 , and the front and rear broken bones  650  and  660  are rejoined by injecting the medical filling  300 . The tightening device  420  is further employed to reinforce the joining between the front broken bone  650 , the rear broken bone  660 , and the hollow fixation part  100  in order to enhance the stability thereof. The surgical method thereof is further described in  FIGS. 29   a  to  29   k.    
         [0142]      FIG. 27  is a schematic view showing a long bone fixation system comprising the bone fixation device being joined with a tightening device, according to still another preferred embodiment of the present invention. Wherein  100  is a hollow fixation part,  200  is a cover part,  300  is a medical filling,  420  is a tightening device,  550  is a supplementary fixation device,  650  is a front broken bone,  660  is a rear broken bone, and  670  is a split. The hollow fixation part  100  and the cover part  200  are fitted through the rear broken bone  660 , the supplementary fixation device  550 , the split  670 , and the front broken bone  650 , and the front and rear broken bones  650  and  660  are rejoined by injecting the medical filling  300 . The tightening device  420  is further utilized to reinforce the joining between the front broken bone  650 , the rear broken bone  660 , and the hollow fixation part  100  in order to enhance the stability thereof. The surgical method thereof is further described in  FIGS. 29   a  to  29   k.    
         [0143]      FIG. 28  is a schematic view showing a long bone fixation system comprising the bone fixation device being joined with a tightening device, according to a further preferred embodiment of the present invention. Wherein  100  is a hollow fixation part,  200  is a cover part,  230  is a second cover part,  300  is a medical filling,  420  is a tightening device,  650  is a front broken bone,  660  is a rear broken bone, and  670  is a split. The hollow fixation part  100 , the cover part  200 , and the second cover part  230  are fitted through the rear broken bone  660 , the split  670 , and the front broken bone  650 , then the front and rear broken bones  650  and  660  are secured together by injecting the medical filling  300  into the cover part  200 , and then reinforced by injecting the medical filling  300  into the second cover part  230 . The tightening device  420  is further utilized to reinforce the joining between the front broken bone  650 , the rear broken bone  660 , and the hollow fixation part  100  in order to enhance the stability thereof. 
         [0144]      FIGS. 29   a  to  29   k  are schematic views showing the surgical steps for installing the long bone fixation system of the invention. Wherein  100  is a hollow fixation part,  200  is a cover part,  220  is a halting part,  300  is a medical filling,  420  is a tightening device,  650  is a front broken bone,  660  is a rear broken bone,  670  is a split,  770  is a drilling device,  780  is a guiding device,  700  is an injecting device, and  790  is a locking device.  FIG. 29   a  shows: The drilling device  770  drilling into the rear broken bone  660 .  FIG. 29   b  shows: The drilling device  770  drilling into the rear broken bone  660 , via the split  670 , and into the front broken bone  650 .  FIG. 29   c  shows: The drilling device  770  being removed after drilling is completed.  FIG. 29   d  shows: The hollow fixation part  100  and the cover part  200  are placed into a hole  850  created by the drilling device  770 , wherein the injecting device  700  is joined with the hollow fixation part  100 , and the guiding device  780  is allowed to go through the hollow fixation part  100  via the injecting device  700 , into the cover part  200  and push against the halting part  220 , so as to support and protect the cover part  200  from collapsing when it is inserted into the broken bone.  FIG. 29   e  shows: The hollow fixation part  100  and the cover part  200  being completely inserted into the hole  850 .  FIG. 29   f  shows: The long bone fixation system being placed into position, and the guiding device  780  is then removed from the system.  FIG. 29   g  shows: The medical filling  300  is injected into the cover part  200  via the injecting device  700  and the hollow fixation part  100 .  FIG. 29   h  shows: The medical filling  300  and the cover part  200  have become lump-like.  FIG. 29   i  shows: The injecting device  700  being removed from the hollow fixation part  100  after injecting is completed.  FIG. 29   j  shows: The tightening device  420  being locked into the hollow fixation part  100  by using the locking device  790 .  FIG. 29   k  shows: The tightening device  420  being locked into the hollow fixation part  100  and used to tighten the joining between the front broken bone  650 , the rear broken bone  660 , and the hollow fixation part.