Medical instrument for tightening double-thread-end steel wire

Abstract

The invention discloses a medical instrument for tightening a double-thread-end steel wire. The medical instrument comprises a double-thread-end rack, a first gear, a first supporting rod, a first retainer, a second gear, a second supporting rod, a second retainer, a first wrench, a second wrench and a fifth hand wheel; the first gear and the first supporting rod form a gear-rack meshing relation;the first retainer enables the first gear and the first supporting rod to keep a certain meshing distance all the time; the second gear and the second supporting rod form a gear-rack meshing relation; the second retainer enables the second gear and the second supporting rod to keep a certain meshing distance all the time; the first wrench is used for clamping the left thread end; the second wrench is used for clamping the right thread end; the fifth hand wheel drives the first supporting rod and the second supporting rod to be opened towards two sides through a transmission structure composedof a first bevel gear set, a right end cover, a second worm gear, a first planet bevel gear, a left end cover, a second bevel gear set and a second planet bevel gear; and tightening and loosening ofa double-thread-end steel wire and steel wires led out of two single thread ends are achieved.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to a medical device used for tightening double wire-end steel wires. Background technique [0002] The patella is located in front of the knee joint and in front of the lower end of the femur. It is the largest sesamoid bone in the human body and is embedded in the quadriceps tendon. It is a triangular flat bone and participates in the formation of the knee joint. The main function of the patella is to protect the knee joint. It has the function of avoiding the friction of the quadriceps tendon on the cartilage surface of the femoral condyle. It transmits the strength of the quadriceps and participates in the function of forming the knee extensor device. It also maintains the stability of the knee joint in a half-squat position and prevents excessive adduction of the knee joint. The functions of abduction and extension and flexion, as well as the function of increasing the r...

AI Technical Summary

Problems solved by technology

[0006] 1) One of the above-mentioned equipment cannot solve the operation involving the extraction of two single wire ends. In this case, only two medical staff can be used to operate two of the above-mentioned equipment to participate in the operation, which not only wastes medical resources, but also occupies the working space of the chief surgeon, reducing surgical efficiency;

[0007] 2) Patella repair surgery will determine a wire binding method according to the actual fracture situation, and the number of wire ends is also determined. In the technical solution involved in the above-mentioned invention patent, the single wire end tensioning mechanism and the double wire end The tensioning mechanisms are respectively located at both ends of the rotating mechanism, that is, the above-mentioned equipment has both a single-thread tensioning mechanism and a double-thread tensioning mechanism, and only one tensioning mechanism is used in the operation, and the other tensioning mechanism It must be idle. Since the above-mentioned equipment is operated by hand, the idle tensioning mechanism not only occupies the operation space, but also increases the load on the arms of the medical staff when operating, increasing the burden on the medical staff;

[0008] 3) With reference to paragraph [0065], paragraph [0066], paragraph [0067] of the description of the above-mentioned patent document and the drawings in the description Figure 23 , Figure 24 , Figure 25, it can be seen that because it uses the first sleeve (311) with the active helical teeth (312) and the second sleeve (313) with the driven helical teeth (314) for transmission, the expected technical effect is One-way transmission, can not rotate in reverse; because in the process of tightening the steel wire, the chief surgeon needs to try the tightening force several times before tying the end of the steel wire, so as to achieve the best effect on the restoration of the bone suture. In the process of tightening the steel wire, if excessive tightening needs to be loosened, the equipment involved in the above-mentioned patent cannot achieve the technical effect of loosening the steel wire, and only the first hand-tightening bolt (214) or the second hand-tightening bolt (214) can be opened. 227) Loosen the compressed steel wire end and restore the initial state of the above-mentioned equipment, then re-tighten the compressed steel wire end, which will not only seriously affect the operation efficiency, but also cause secondary damage to the damaged patella;

[0009] 4) Since the driving helical teeth (312) and the driven helical teeth (314) are actually ratchet transmission structures, and the number of teeth is fixed, the minimum number of steps that can be realized by one round of circumferential rotation is also fixed, which cannot be achieved Stepless transmission, therefore, one less step is too loose and one more step is too tight during the operation. Even if the number of helical teeth is increased, the degree of looseness or tightness can only be reduced, and cannot be completely eliminated. Moreover, the number of teeth increases , the tooth shape will become smaller, and the material has a stress limit, so the number of helical teeth cannot be infinitely increased;

[0010] 5) With reference to the technical features described in paragraph [0065], paragraph [0066] and paragraph [0067] of the above-mentioned patent document description, it can be seen that there is no self-locking transmission between the transition gear one (315) and the drive shaft 238 structure, therefore, the technical effect in paragraph [0065] "When the driving helical tooth 312 rotates in reverse, the driving helical tooth 312 will press the driven helical tooth 314 and make the sleeve two 313 float away from the sleeve one 311 "It cannot be realized, because after the steel wire is tightened for the first time, there is a certain tension in the steel wire, which will cause the driven helical tooth 314 to have a tendency to rotate in the opposite direction. Furthermore, the floating spring 317 pushes the sleeve two 313 to the top Tight to the second sleeve 313, therefore, the actual situation is that when the active helical gear 312 rotates in reverse, the second sleeve 313 will not float away from the first sleeve 311, but reversely rotates together with the active helical gear 312, so that the retraction The tight steel wire is loosened, and the technical effect of repeatedly pulling the wrench 305 to tighten the steel wire cannot be achieved. Such technical defects make the technical solution involved in the above patent unable to achieve its technical purpose, let alone solve the problems existing in the prior art. insufficient

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