Disclosure of Invention
Therefore, the invention aims to provide the combined marrow needle for fixing the femur fracture, which only needs to fix the proximal end of the marrow needle, does not need to fix the distal end, reduces the using amount of the locking nails, avoids the influence of the locking nails on the area near the fracture section, can eliminate the stress concentration phenomenon generated at the end of the marrow needle, reduces the mutual influence between the end of the marrow needle and the femur, does not influence the axial pressure action and the stimulation action of the fracture section, is more beneficial to promoting fracture healing and accelerating the fracture healing period.
The invention relates to a combined marrow needle for fixing femur fracture, which comprises two marrow needle bodies which can penetrate along two ends of femur and are fixedly connected in femur marrow in an axial detachable manner;
further, the device also comprises a connecting rod for axially and fixedly connecting the two marrow needle bodies to the femur intramedullary along the puncture end;
Further, the marrow needle body is provided with a hollow inner cavity, and two ends of the connecting rod respectively penetrate into the hollow inner cavities of the two marrow needle bodies along the puncture ends of the marrow needle bodies to be fixedly connected;
Further, the marrow needle body comprises a hollow needle body and a needle seat, an inner sleeve used for being connected with the connecting rod is arranged in the needle seat, and the inner wall of the inner sleeve is in threaded connection with the connecting rod;
further, the inner sleeve is in threaded connection with the inner wall of the needle seat;
Further, a limiting clamping block for axially limiting and fixing the inner sleeve is arranged in the needle seat, and the limiting clamping block is in threaded connection with the inner wall of the needle seat;
Further, the marrow needle body is provided with anti-rotation connecting ports for mutually butting puncture ends;
further, the anti-rotation connecting port is at least 2 axial teeth circumferentially arranged along the puncture ends of the marrow needle bodies, and the puncture ends of the two marrow needle bodies are fixedly connected through the axial teeth in a meshed manner;
Further, the section of the tooth surface of each axial tooth is arc-shaped, and the adjacent axial teeth are in smooth transition;
further, the limit clamping block and the inner sleeve are nuts, and the section of the inner sleeve is U-shaped.
The beneficial effects of the invention are as follows: the two marrow needles can be connected and fixed into a whole, and in the using process, only the proximal end of the marrow needle is required to be fixed by a locking nail, the distal end is not required to be fixed by the locking nail, the using amount of the locking nail is reduced, the damage of the installation of the marrow needle to the bone part is reduced, and the influence of the locking nail on the area near the fracture section is avoided. The combined marrow needle can be used in combination or independently, and has strong universality. The marrow needle is suitable for the following cases: 1. the femur distal and proximal ends are simultaneously fractured, so that stress concentration and poor fixation strength caused by other combined fixation are avoided; 2. femoral pathological fractures have been treated with palliative treatment, either intramedullary or extramedullary, eventually failing in the short term due to the erosive destruction of the tumor. The femoral through long intramedullary nail is fixed at the far end and the near end, so that the effective fixing time can be greatly prolonged, and the pain of a patient is relieved; 3. in the past, the femur fracture adopts the intramedullary nail to fix and appears the fracture around the tail end of the intramedullary nail, and the remedial measure has a plurality of problems.
Detailed Description
FIG. 1 is a schematic view of a partial cross-sectional structure of the assembled intramedullary nail of the present invention; FIG. 2 is a schematic view of the assembled structure of the spinal needle of the present invention; fig. 3 is a schematic view of the structure of the connecting rod of the marrow needle. As shown in the figure: the combined marrow needle for fixing the femoral fracture comprises two marrow needle bodies 1 which can penetrate along two ends of a femur and are fixedly connected in the femur marrow in an axially detachable manner; the two marrow needle bodies 1 penetrate into the marrow of the femur along the two ends of the femur and are connected into a whole in a penetrating end connecting mode, and the two marrow needles form one marrow needle, so that locking nails are only required to be fixed at the proximal ends (penetrating ends of the femur) of the two marrow needle bodies 1, the distal ends of the two marrow needle bodies 1 are not required to be fixed by the locking nails, the dosage of the locking nails is reduced, meanwhile, the trauma to the femur is reduced, the stress concentration phenomenon generated at the end of the marrow needle can be eliminated, the mutual influence between the end of the marrow needle and the femur is reduced, and the marrow needle is convenient to dismantle. For the condition of fracture at multiple positions of femur, the two marrow needle bodies 1 can realize the connection of fracture injury parts at multiple positions, and the connecting ends of the two marrow needle bodies 1 are naturally positioned between the fracture injury parts, so that the locking nails can be prevented from being locked between the fracture injury parts through the connection and fixation of the two marrow needle bodies 1, the operation difficulty can be reduced, and meanwhile, the injury and pain can be effectively reduced. The traditional marrow needles are not connected, and a locking nail is required to be locked between fracture injury parts to fix the distal ends of the marrow needles, so that the operation difficulty is increased, and meanwhile, the fracture injury parts are inevitably damaged additionally.
In the embodiment, the device also comprises a connecting rod 2 for axially and fixedly connecting the two marrow needle bodies 1 to the femur intramedullary along the puncture end; the connecting rod 2 is adopted to connect and fix the two marrow needle bodies 1, and the structure is simple.
In this embodiment, the intramedullary pin body 1 has a hollow cavity, and two ends of the connecting rod 2 respectively penetrate into the hollow cavities of the two intramedullary pin bodies 1 along the piercing ends of the intramedullary pin bodies 1 to be fixedly connected; the marrow needle body 1 adopts the traditional hollow tubular structure of the marrow needle, so the purpose of fixing two marrow needles into one is realized by the internal fixation of the hollow tubular structures of the two marrow needle bodies 1 respectively penetrated by the connecting rod 2, the structure is simpler, and the operation is easier. Because the marrow needle bodies 1 are all communicated cavity structures, because the two ends of the marrow needle bodies 1 in the circumferential direction are naturally also open structures, when in use, the two marrow needle bodies 1 respectively enter the marrow along the two ends of the femur, then the connecting rod 2 penetrates into the inner cavity of the marrow needle body 1 along the proximal opening part of one marrow needle and enters the inner cavity of the other marrow needle body 1 for fixation, thereby achieving the purpose of fixing the two marrow needles into one marrow needle, and then the locking nails are respectively fixed at the proximal end parts of the marrow needle bodies 1.
In this embodiment, the intramedullary pin body 1 includes a hollow pin body 11 and a pin seat 12, an inner sleeve 3 for connecting with the connecting rod 2 is disposed in the pin seat 12, and an inner wall of the inner sleeve 3 is in threaded connection with the connecting rod 2; the inner sleeve 3 is in threaded connection with the inner wall of the needle seat 12; a limiting clamping block 4 for axially limiting and fixing the inner sleeve 3 is further arranged in the needle seat 12, and the limiting clamping block 4 is in threaded connection with the inner wall of the needle seat 12; the needle body 11 and the needle seat 12 are hollow tubular structures, after the connecting rod 2 is connected and penetrates into the cavities of the two marrow needle bodies 1, two ends of the connecting rod 2 are fixed through threaded connection with the inner sleeves 3 arranged in the cavities of the two marrow needle bodies 1, the inner sleeves 3 are fixed through threaded connection with the inner walls of the cavities of the marrow needle bodies 1, and meanwhile, in order to prevent the inner sleeves 3 from loosening, the end parts of the inner sleeves 3 are provided with limiting clamping blocks 4 so as to limit the axial movement of the inner sleeves 3, so that the connection stability of the connecting rod 2 and the structural strength of the fixed ends are improved. After the connecting rod 2 penetrates into the inner cavity of the marrow needle body 1, the inner sleeve 3 is placed into the inner cavity of the marrow needle body 1 and is fixedly connected with the end part of the connecting rod 2 through threads, and then the limit clamping block 4 is placed into the inner cavity of the marrow needle body 1 and is placed into the inner sleeve 3 to prevent the inner sleeve 3 from loosening. After the two marrow needles are fixed, locking nails are locked and fixed at the proximal ends of the marrow needles.
In this embodiment, the intramedullary pin body 1 is provided with anti-rotation connection ports 5 for mutually abutting puncture ends; the puncture ends of the two marrow needle bodies 1 are fixedly connected through the anti-rotation connection port 5, that is, not only the two marrow needle bodies 1 are connected by the connecting rod 2 in the cavity, but also the puncture ends of the two marrow needle bodies 1 are mutually connected, so that the internal and external dual connection fixation is realized, the connection stability of the puncture ends of the marrow needle bodies 1 is improved, the two marrow needle bodies 1 are prevented from rotating along the connecting rod 2, the puncture ends of the marrow needle bodies 1 are mutually locked, the two marrow needle bodies 1 can be integrally stressed, and the stress uniformity of the two marrow needle bodies 1 is ensured. That is, the transverse and longitudinal limit fixing of the two marrow needles is realized through the connecting rod 2 and the anti-rotation connecting port 5 of the puncture end of the marrow needle body 1, the structural strength is higher, and the stress concentration phenomenon in the stress process can be effectively avoided.
In this embodiment, the anti-rotation connection port 5 is at least 2 axial teeth circumferentially arranged along the piercing end of the intramedullary nail body 1, and the piercing ends of the two intramedullary nail bodies 1 are fixedly connected by axial teeth in a meshing manner; the piercing end (also referred to as the needle tip) of the needle body 1 may be of a necked-in configuration. Preferably 2, axially directed teeth and are axially opposed along the piercing end of the hollow needle body 1. The 2 axial teeth form a fish-mouth-like anti-rotation connecting port 5 at the puncture end, and further the teeth are mutually penetrated through the fork to realize radial and axial limiting fixation, so that the structure is simpler, and the positioning, the installation and the fixation are convenient to realize. The axial teeth are arranged along the axial direction of the marrow needle body 1, the two marrow needle bodies 1 are opposite to each other to form a shape that the teeth are opposite to each other, and when the connection and the fixation are realized, the tooth convex of one puncture end corresponds to the tooth concave of the other puncture end to be meshed and fixed. The two marrow needle bodies 1 are identical in size, and teeth are identical in size, so that the two marrow needle bodies are convenient to engage. In addition, the structure of the anti-rotation connection port 5 is also beneficial to positioning during installation, and the convenience and accuracy of installation are improved.
In this embodiment, the tooth surface section of the axial teeth is arc-shaped, and the adjacent axial teeth are in smooth transition; is convenient for meshing, matching and fixing, and has higher firmness and stronger stability.
In this embodiment, the limit clamping block 4 and the inner sleeve 3 are nuts, and the cross section of the inner sleeve 3 is U-shaped. Simple structure, the fastness is high, and stability is strong, also is convenient for install and dismantle. The intramedullary pin with proper length can be selected for installation according to actual needs, and the intramedullary pin is convenient to detach.
In summary, the above-described embodiment of the intramedullary nail is applicable to the following cases: 1. the femur distal and proximal ends are simultaneously fractured, so that stress concentration and poor fixation strength caused by other combined fixation are avoided; 2. femoral pathological fractures have been treated with palliative treatment, either intramedullary or extramedullary, eventually failing in the short term due to the erosive destruction of the tumor. The femoral through long intramedullary nail is fixed at the far end and the near end, so that the effective fixing time can be greatly prolonged, and the pain of a patient is relieved; 3. in the past, the femur fracture adopts the intramedullary nail to fix and appears the fracture around the tail end of the intramedullary nail, and the remedial measure has a plurality of problems.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered by the scope of the claims of the present invention.