Intertrochanteric fracture intramedullary fixation system

Abstract

The invention relates to an intertrochanteric fracture intramedullary fixation system, comprising: an intramedullary nail, a proximal tension locking nail and a distal locking nail; the intramedullary nail comprises a proximal end and a distal end provided with a first hole and a second hole respectively; the proximal tension locking nail penetrates through the first hole, with the front end entering the femoral head and the tail end fixed to the intramedullary nail through a fixing part; the distal locking nail is fixed to the intramedullary nail through the second hole; the tail end of the distal tension locking nail is a releasable mounting tool and a pressure tool, the pressure tool is of hollow structure, the inner wall of the pressure tool is in threaded connection with the proximal tension locking nail. Compared with the prior art, the intertrochanteric fracture intramedullary fixation system integrates the advantages in both an intramedullary nail and a locking steel plate, marrow expanding is not required, surgical time is effectively shortened, disturbances on the medullary cavity are significantly reduced, intraoperative and postoperative hemorrhage is greatly reduced, auxiliary structures such as an anti-rotation nail are not required, surgical time is further shortened, and the system is more suitable for Chinese people to use.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to an intramedullary fixation system for intertrochanteric fractures. Background technique [0002] Intertrochanteric fracture is a common orthopedic disease, 90% of which are caused by falls. The overall incidence rate of the population is 63 / 100,000 for women and 34 / 100,000 for men. 30% of them occur in Asia, and most of them are in China. With the average life expectancy The incidence rate of prolongation and aging is increasing year by year. [0003] Surgical treatment is currently routinely used, which has the advantages of promoting early mobilization, facilitating rehabilitation, preventing bed rest complications, and reducing mortality. Surgical fixation methods are divided into: plate fixation (extramedullary), and intramedullary nail fixation (intramedullary). [0004] Plate fixation (extramedullary) mainly adopts DHS (Dynamic Hip Screw), which achieves the maximu...

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Problems solved by technology

[0004] Plate fixation (extramedullary) mainly adopts DHS (Dynamic Hip Screw), which achieves the maximum contact with the fracture surface through sliding pressure, thereby reducing the load on the internal fixation, but it has the following disadvantages: it is only suitable for stable fractures ;Larger surgical exposure, increasing the risk of bleeding and infection; Eccentric fixation, poor stability, prone to the risk of broken nails, broken plates, and cutting out the femoral head; prone to coxa varus

[0005] Intramedullary nail fixation (intramedullary method) belongs to central fixation with good mechanical properties and is suitable for all types of fractures. For reasons such as more stable fixation and selection of a more suitable intramedullary nail, most intramedullary nails need to be reamed, resulting in temporary damage to the blood supply of the medullary cavity, increased intraoperative (post) bleeding, prolonged operation time, and increased related surgical risks; Too thick and not suitable for the bone characteristics of Chinese people. At present, most of the instruments are designed according to the bone characteristics of European and American people, and they are generally thick. Take the Intertan double nail design as an example. The double nails occupy more space in the femoral neck, which makes it impossible for some people with short stature to use it or during surgery. Increased fracture risk; limited or no compression, Gamma-3 has limited compression capacity, and PFNA cannot pressurize; intraoperative fracture displacement is prone to occur, and intramedullary nails are placed due to anatomical mismatch and too thick intramedullary nails. The insertion force is strong or even rough insertion, resulting in fracture displacement, and the PFNA helical blade can also cause the separation and displacement of fracture ends

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