CN201200470Y

CN201200470Y - Slidable pressurised intramedullary nail

Info

Publication number: CN201200470Y
Application number: CNU2008200529852U
Authority: CN
Inventors: 李康华; 罗令; 孙晓峰
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-04-28
Filing date: 2008-04-28
Publication date: 2009-03-04
Anticipated expiration: 2018-04-28

Abstract

The utility model discloses an intramedullary nail which can pressurize a fracture part in a sliding way, and comprises an intramedullary nail. Two or more than two locking holes are arranged at the proximal end of the intramedullary nail; a lock pin is arranged in each locking hole; the far end of the intramedullary nail is provided with a fixed screw hole and a sliding screw hole in a long circle shape; a sliding pressurizing bolt is arranged in the sliding screw hole; both ends of the far end of the sliding screw hole are provided with sliding guide inclined planes, and the proximal end is provided with internal threads; the head part of the sliding pressurizing bolt is provided with a flange which can slide relatively to the sliding guide inclined planes; and a fixed bolt is arranged in the fixed screw hole. The utility model has the advantages that the intramedullary nail which can pressurize a fracture part can perform prepressurization for the fracture part so as to promote the healing of the fracture and prevent the lock pins from loosening and withdrawing.

Description

Jia Ya intramedullary pin slidably

Technical field

This utility model relates to the internal fixation system that is used for fractures, relates in particular to the slidably intramedullary pin of pressurization.

Background technology

The internal fixation system that is used for fractures at present mainly contains hollow nail system, pegboard systems and intramedullary nail system.Wherein intramedullary nail system more meets internal fixation theory biology, and indication is more, and wound is little.Existing intramedullary pin is to the pressurization of fracture end, adopts in the art fixedly that far-end to be carried out the people behind the proximal screw be the method for hitting of kowtowing, and the disconnected closely chimeric degree of fracture can't accurately be held, and easily loosening once more, influences union of fracture; Existing intramedullary pin locking nail hole inwall is smooth design, and the stress that hold-down screw is born can not completely be transmitted on the intramedullary pin, causes hold-down screw to slide easily, the fracture site solid failure, or the hold-down screw stress concentration causes harmful effects such as fracture; The screw mounting hole that designs for power pressurization and load conduction during fracture of femoral neck is fixing is the unthreaded hole that does not have female thread, after the fracture end fracture absorbs, easily cause moving back the generation of nail or cause screw to wear out femoral head, especially for osteoporotic patient, the design of the motorization of screw also is not suitable for, and easily bone trabecular subsiding is taken place and makes solid failure; For less fracture fixations of bone amount such as comminuted fracture or osteoporosises, the stability of intramedullary pin is particularly necessary, and becoming flexible between staple and the intramedullary pin easily causes negative effect to stability.

The utility model content

The technical problems to be solved in the utility model is to overcome the deficiencies in the prior art, provide a kind of can be to fracture precharge, promote union of fracture, prevent nail loose, move back the slidably intramedullary pin of pressurization of nail.

For solving the problems of the technologies described above, this utility model by the following technical solutions.

A kind of slidably intramedullary pin of pressurization, comprise intramedullary pin, the close end of intramedullary pin offers two or more lock holes, be equiped with pinning in the lock hole, the distal portion of intramedullary pin offers fixing threaded hole and is oblong slip screw, be equiped with the slip forcing screw in the described slip screw, the two ends of slip screw distal side are equipped with the slide-and-guide inclined-plane, the proximal lateral is provided with female thread, the head of slip forcing screw is provided with the flange of slide-and-guide inclined-plane slip relatively, is equiped with hold-down screw in the described fixing threaded hole.

Described slip screw is positioned at the near-end of fixing threaded hole.

Described lock hole is provided with female thread, and described pinning is provided with the external screw thread that the female thread with lock hole is complementary.

Described pinning comprises fixedly pinning and/or pulling force pinning, and described fixedly pinning is the full thread screw, and the head of described pulling force pinning is provided with pad, and the pulling force pinning is a smooth section near an end of head, and the other end is a thread segment.

Compared with prior art, advantage of the present utility model just is: the distal portion at intramedullary pin offers the slip screw, to the slip screw far-end slip forcing screw of packing into, flange extruding slide-and-guide inclined-plane with slip forcing screw head, make intramedullary pin and slip forcing screw drive knochenbruch and produce the motion that compresses mutually, the reuse hold-down screw is fixed, thereby realizes the precharge to the knochenbruch place, make to keep accurate, fastening butt joint between two knochenbruch, play the effect that promotes union of fracture; The slip screw is arranged at the near-end of fixing threaded hole, can make the combination of knochenbruch tightr, more firm; Lock hole at intramedullary pin is provided with female thread, pinning is provided with the external screw thread that the female thread with lock hole is complementary, make pinning pass through the screw thread relative fixed, prevent that pinning from producing slip relatively in the lock hole of intramedullary pin, avoid nail loose, move back nail with intramedullary pin; Pinning comprises fixedly these two kinds of pinnings and pulling force pinning, fixedly pinning is the full thread screw, can realize complete stationary, be particularly suitable for that the pulling force pinning can play the effect to fracture precharge, promotion union of fracture to comminuted fracture and sufferers of osteoporosis face treatment of fractures; In fracture healing process, can take out the hold-down screw of far-end, keep the slip forcing screw, allow fracture end under action of gravity, to produce the fine motion that helps union of fracture.

Description of drawings

Fig. 1 is the structural representation of intramedullary pin in this utility model;

Fig. 2 is A-A cross section view of Fig. 1;

Fig. 3 is a structural representation of the present utility model.

Each label is represented among the figure:

1, intramedullary pin 2, lock hole

3, fixing threaded hole 4, slip screw

5, hold-down screw 6, slip forcing screw

7, fixedly pinning 8, pulling force pinning

9, femur 11, close end

12, distal portion 61, flange

41, slide-and-guide inclined-plane 81, pad

82, smooth section 83, thread segment

The specific embodiment

Be example with the intramedullary pin that is used for the treatment of Fracture of femur below, this utility model is described in further detail.

As shown in Figure 1 to Figure 3, the slidably intramedullary pin of pressurization of the present utility model comprises intramedullary pin 1, and (near-end is depended on an end of nearly heart at the close end 11 of intramedullary pin 1, far-end refers to the end away from heart) offer two lock holes that are arranged in parallel 2, be equiped with pinning in the lock hole 2.The distal portion 12 of intramedullary pin 1 offers fixing threaded hole 3 and is oblong slip screw 4, is equiped with slip forcing screw 6 in the slip screw 4, and hold-down screw 5 is installed in the fixing threaded hole 3.The two ends of slip screw 4 distal sides are equipped with slide-and-guide inclined-plane 41, and this slide-and-guide inclined-plane 41 is a shiny surface, and slip screw 4 proximal laterals are provided with female thread.The head of slip forcing screw 6 is provided with the flange 61 of slide-and-guide inclined-plane 41 slips relatively, when slip forcing screw 6 is installed, can select to pack into from an end of slip screw 4 distal sides, utilize the flange 61 extruding slide-and-guide inclined-planes 41 of slip forcing screw 6 heads, intramedullary pin 1 relative slip forcing screw 6 is slided to far-end, and drive knochenbruch by intramedullary pin 1 with slip forcing screw 6 and produce the motion that compresses mutually, realization is to the precharge at knochenbruch place, the knochenbruch place is combined closely, play the effect that promotes union of fracture.Under the situation of pressurization that do not need to slide, also can select slip forcing screw 6 is screwed in the set female thread in slip screw 4 proximal laterals, play fixation.Slip screw 4 is set in place in the position of fixing threaded hole 3 near-ends, so that the combination of knochenbruch is tightr, more firm.Slide in order to prevent that pinning from producing relatively in the lock hole 2 of intramedullary pin 1, avoid nail loose, move back nail, in lock hole 2, be provided with female thread, pinning is designed to fixedly pinning 7 and pulling force pinning 8, fixedly pinning 7 is the full thread screw, can with lock hole 2 by being threaded, realize complete stationary, be particularly suitable for comminuted fracture and sufferers of osteoporosis face treatment of fractures, head at pulling force pinning 8 is provided with pad 81, pulling force pinning 8 is a smooth section 82 near an end of head, and the other end is a thread segment 83, and smooth section 82 equates with the screw thread path of lock hole 2, when pulling force pinning 8 is installed, by tapped

lock hole

2,82 of smooth section can be sheathed in the lock hole 2 its thread segment 83 through rotation, and pulling force pinning 8 can play fracture precharge, promote the effect of union of fracture.

Different according to the kind of bone and size, lock hole 2 also can be set to more than two; According to the different of character and fracture situation of fracturing, the pinnings that are installed in the lock hole 2 can all be selected fixedly pinning 7 for use, or all select pulling force pinning 8 for use, or select fixedly pinning 7 and pulling force pinning 8 for use, and this class conversion all should drop within the protection domain of the present utility model.

When the intramedullary pin of the slidably pressurization of the present utility model of in having produced the femur 9 of fracturing as shown in Figure 3, packing into, earlier fracture site is resetted, to the medullary cavity processing of preparing, intramedullary pin 1 is inserted in the medullary cavity, with guider two pieces of guide pins being inserted femoral head along a lock hole 2 respectively does temporary fixed, by sight pulling force pinning 8 is pierced in the femoral head along guide pin, the smooth section 82 of pulling force pinning 8 is placed in the lock hole 2, thread segment 83 surpasses the fracture line at femoral head place, and tighten pulling force pinning 8, pad 81 and surface of bone are fitted, withdraw from guide pin simultaneously, realize fracture precharge, fixedly pinning 7 pierces in the femoral head along another guide pin again, make fixedly that pinning 7 is threaded with intramedullary pin 1, and withdraw from guide pin, can finish fixation of fractures bone thigh head place; Fracture for the femoral shaft place, earlier slip forcing screw 6 is pierced the side of slip screw 4 by slide-and-guide inclined-plane 41, the flange 61 of slip forcing screw 6 heads is contacted with slide-and-guide inclined-plane 41, utilize flange 61 extruding slide-and-guide inclined-planes 41, intramedullary pin 1 relative slip forcing screw 6 is slided to far-end, and drive knochenbruch by intramedullary pin 1 with slip forcing screw 6 and produce the motion that compresses mutually, realization is to the precharge at knochenbruch place, again hold-down screw 5 is pierced and be fixed in the fixing threaded hole 3, thereby make the combination of knochenbruch tighter, more firm, play the effect that promotes union of fracture.In fracture healing process, can take out the hold-down screw 5 of far-end, keep slip forcing screw 6, allow fracture end under action of gravity, to produce the fine motion that helps union of fracture.

Claims

1, a kind of slidably intramedullary pin of pressurization, comprise intramedullary pin (1), the close end (11) of intramedullary pin (1) offers two or more lock holes (2), lock hole is equiped with pinning in (2), the distal portion (12) that it is characterized in that intramedullary pin (1) offers fixing threaded hole (3) and is oblong slip screw (4), be equiped with slip forcing screw (6) in the described slip screw (4), the two ends of slip screw (4) distal side are equipped with slide-and-guide inclined-plane (41), the proximal lateral is provided with female thread, the head of slip forcing screw (6) is provided with the flange (61) of slide-and-guide inclined-plane (41) slip relatively, is equiped with hold-down screw (5) in the described fixing threaded hole (3).

2, the slidably intramedullary pin of pressurization according to claim 1 is characterized in that described slip screw (4) is positioned at the near-end of fixing threaded hole (3).

3, the slidably intramedullary pin of pressurization according to claim 1 and 2 is characterized in that described lock hole (2) is provided with female thread, and described pinning is provided with the external screw thread that the female thread with lock hole (2) is complementary.

4, the slidably intramedullary pin of pressurization according to claim 3, it is characterized in that described pinning comprises fixedly pinning (7) and/or pulling force pinning (8), described fixedly pinning (7) is the full thread screw, the head of described pulling force pinning (8) is provided with pad (81), pulling force pinning (8) is smooth section (82) near an end of head, and the other end is thread segment (83).