CN2337969Y - Intramedullary nail locked by expanding function - Google Patents

Abstract

The utility model discloses an intramedullary nail locked by an expanding function. The utility model is composed of an inner and an outer nails that are sheathed together. The far end of the inner nail is provided with an ellipsoidal bracing block core, wherein, a short shaft of which is a little larger than a diameter of the outer nail. A pipe opening of the far end of the outer nail is provided with an expanded supporting claw having ordered breaches, and the near end of the outer nail is a pipe section with an expanded diameter. When the supporting block core and the expanded supporting claw are tightly inserted, matched and expanded in the marrow cavity, the intramedullary nail which is composed of the inner and the outer nails can be stably embedded with the fracture femoral bone, and intramedullary fixation can be conducted without fluoroscopy of X-ray. When the fracture is healed, a lengthening intramedullary nail to be extracted is composed of a lengthening rod of the inner and outer nails and a pipe, and the inner and the outer nails of the intramedullary nail can be entirely taken out. The intramedullary nail locked by the expanding function has the advantages of convenient operation, easy control and conspicuous curative effect.

Description

The expansion locking intramedullary pin

This utility model relates to the improvement of bone healing equipment, especially a kind of expansion locking intramedullary pin, and it belongs to technical field of medical instruments.

Intramedullary nail is used for the history in existing more than 100 year for the treatment of of fracture, along with the development of technology, intramedullary nail with lock has the trend that replaces gradually traditional intramedullary nail, but since its in use, horizontal pinning is installed: need under x-ray, locate, be walked crosswise by cortex of bone by the intramedullary nail two ends and penetrate pinning.This operating technology very complex be difficult for to be grasped, in the future after the union, get except the time also difficulty, and somewhat expensive.Therefore still be difficult at present apply.

The purpose of this utility model is that a kind of novel expansion locking intramedullary pin will be provided.This nail is simple in structure, and parts match is reasonable, does not need the x-ray location in using operation, and parts are connected firmly stable, and simultaneously, this nail is used for fracture fixation has pressurization to promote union to fracture end.And get except the time, can eliminate as early as possible lock-out state, extract easily inside and outside nail.

Task of the present utility model has following technical scheme to finish, developed a kind of expansion locking intramedullary pin, it comprises: the inside and outside nail that sleeve is combined together, interior nail slightly is longer than outer nail, and outside the far-end mouth of pipe insertion of outer nail, follow closely in the tube chamber, the near-end that stretches out the interior nail of outer nail near-end is one section hollow pipe that has internal and external screw thread, and distal head of nail is provided with support that minor axis is slightly larger than the elliposoidal of the outer nail diameter stifled core that rises in this; The pipeline section at the far-end mouth of pipe place of outer nail is provided with the orderly expansion support claw of breach; The clamp nut that threaded engagement is followed closely in this on near-end external screw thread is followed closely near-end outward by compressing, and insert to rise from the outer nail far-end mouth of pipe and enter in the expansion support claw inner chamber of following closely this outside by the support of following closely in this stifled core that rises, thereby constituting all support claws is risen by support and upsprings and be fastened on state on this stifled core spheroid, the promptly inside and outside intramedullary pin with two fixing points that fits in firm one admittedly that clenches.One section hollow tube with internal thread of described interior nail near-end, the interior nail elongated bar that can be threaded in it, these rod two ends all are provided with one section screw thread.Described outer nail near-end, its mouth of pipe be one section with the hole enlargement pipeline section of riffled tube, in this internal thread pipeline section there be with externally threaded outer nail extension pipe threaded engagement, arrange to pull out on this pipe upper end tube wall and carry side opening, nail and elongated bar thereof are passed this pipeline section in being somebody's turn to do,--outward nail and the extension pipe thereof--intramedullary nail to be pulled out that the intramedullary nail clamp nut is integrated that and is engaged on the elongated bar of following closely in this nail and elongated bar thereof in consisting of by locknut.Described outer nail near-end, its mouth of pipe also can be with externally threaded pipeline section, this pipeline section threaded engagement has the outer nail extension pipe with internal thread, this pipe upper end also arranges to pull out carries side opening, nail and elongated bar thereof are also passed this pipeline section in being somebody's turn to do, and be engaged in this on nail elongated bar nail and elongated bar thereof in consisting of by locknut and clench in--outward nail and extension pipe thereof--and decide nut all-in-one-piece intramedullary nail to be pulled out.

The advantage of intramedullary nail of the present utility model is: because the support that has designed interior nail far-end is risen stifled core and with the expansion support claw of its coupling.Both tightly overlap cooperation and can be mounted in tightly on the pulp cavity inwall cortex of bone, are equipped with the clamp nut pressurization of interior nail near-end again; Like this, the interior nail that inserts the ossis marrow has two fixing points to be fastened on the femoral bone cavitas medullaris of fracture, makes fracture two ends build-in and pressurization is arranged, and promotes union.This intramedullary pin is owing to adopt in intra medullary nail far-end expansion locking mode, can also be as required after locking, the support of following closely in also can unblanking at any time in the art to make is risen and is blocked up the expansion support claw that core breaks away from outer nail, this support claw bounces back automatically, this intramedullary pin is pulled out, thereby adjust fastening position or fracture para-position, again the expansion locking of row two nails.The anti-cripetura of this intramedullary nail, anti-rotation power is strong, and locking effect is good.The expansion locking of inside and outside nail far-end is reasonable in design, and is novel, fixation, and without the roentgen radiation x location, operation is practical.Owing to designed healing in the future for interior nail elongated bar and the nail extension pipe got except intramedullary nail.This rod or tubular construction are reasonable in design, be suitable for using, the nail elongated bar is passed outer nail extension pipe in utilizing, be threaded in respectively interior nail or nail on outward, by the locknut that is fixed on the interior nail elongated bar inside and outside nail and elongated bar thereof, pipe are tightened together again, follow closely pulling out on the extension pipe outward by lancet and carry side opening, the parts such as inside and outside nail can be consisted of get to get from ossis except intramedullary nail removed.It is simple to operate, without X line positioning action, removes with regard to desirable.This intramedullary nail is suitable for the interior fixing of femoral fracture, is particularly useful for pulverizing unstable fracture, and easily thick the and intramedullary nail femoral fracture partially thin and that easily rotate dislocation of the fracture of cripetura and pulp cavity is interior fixing.

Embodiment of the present utility model further describes as follows in conjunction with the accompanying drawings:

Fig. 1, be the schematic diagram of the fixing fracture of intramedullary nail of inside and outside nail combination.

Fig. 2, inside and outside and elongated bar, pipe composite structure sketch map when pulling out for intramedullary pin.

Fig. 3, interior nail and elongated bar thereof in conjunction with sketch map.

Fig. 4, outer pin structure sketch map.

Fig. 5, outer pin structure sketch map.

Make a secondary expansion locking intramedullary pin, referring to Fig. 1, Fig. 3, Fig. 4, it comprises: the inside and outside nail 2,3 that sleeve is combined together.Nail 2 slightly is longer than outer nail 3 wherein, and inserts outer the nail in 3 tube chambers from the far-end mouth of pipe of outer nail 3, the near-end that stretches out the interior nail 2 of outer nail 3 near-ends be one section with internal and external screw thread 9,6 hollow tube.Should in nail 2 distal head be provided with support that minor axis is slightly larger than the elliposoidal of the outer nail 3 diameters stifled core 5 that rises.One pipeline section at the far-end mouth of pipe place of outer nail 3 is provided with the breach expansion support claw 4 of orderly (four divide equally breach or six divides equally breach).Threaded engagement has clamp nut 7 on the nail 2 near-end external screw threads 6 in this, this nut 7 is by compressing outer nail 3 near-ends, and insert to rise from the outer nail 3 far-end mouths of pipe and enter in expansion support claw 4 inner chambers of nail 3 this outside by the stifled core that rises of nail 2 support in this, supportted that rising upsprings and be fastened on state on these stifled core 5 spheroids thereby consist of all support claws 4.It is the intramedullary pin that inside and outside nail 2,3 secure fit become firm one with two fixing points.This intramedullary nail in use, first otch above the femoral greater trochanter of fracture is with the reaming of tuberosity reamer and expand marrow.Again sleeve inside and outside nail 2,3 is together penetrated this inside and outside nail 2,3 simultaneously from the greater trochanter reaming of femur, the far-end that makes this intramedullary pin is by fracture site and then arrive the fracture far-end.On the external screw thread 6 of interior nail 2 near-ends, screw and tighten nut 7, the support of the nail 2 far-ends stifled core 5 that rises is inserted to rise and is entered four of this outer nail 3 and divide equally in expansion support claw 4 inner chambers of breach in can making by the outer nail 3 near-end mouths of pipe that bear down on one, all support claws 4 build-in that rises is tightly fixed on the medullary cavity 1 inwall cortical bone, be about to fracture site like this and in pulp cavity, lock securely.Add and tighten female 7 fastening effect at interior nail 2 near-end external screw threads and make fracture two ends embedding tight and pressurization arranged.

This intramedullary nail need to be got except this inside and outside nail 2,3 in union or opportune moment.Referring to Fig. 2, Fig. 5, concrete operations are as follows: elder generation's otch above greater trochanter, appear nail 2 and clamp nut 7 thereof in this, get except nut 7, interior nail elongated bar 10 is connected with the internal thread 9 of interior nail 2 near-ends by its 10 external screw thread, consist of the interior nail 2 of lengthening.Again outer nail extension pipe 12 is enclosed within outside the interior nail elongated bar 10, and is connected with this external screw thread 13 of managing 12 lower ends in the riffled tube of hole enlargement pipeline section 8 of outer nail 3 near-ends.After inside and outside nail 2,3 lengthens in succession, knock nail elongated bar 10 with glue hammer or wooden mallet, the support of the interior nail 2 far-ends stifled core 5 that rises is withdrawed from from expansion support claw 4 chambeies, all support claws 4 because of the reducing of bullet contracting power automatic folding directly.At last, on the upper external screw thread of interior nail elongated bar 10, screw deflation one locknut 11 again, inside and outside playing fixed, follow closely 2,3 all-in-one-piece effects.Use common bone nail extractor to hook pulling out on the outer nail extension pipe 12 upper end tube walls and carry side opening 14, intramedullary pin the to be pulled out integral body from femoral bone cavitas medullaris that outer nail 3 of nail 2 and elongated bar 10--thereof and extension pipe 12--locknut 11 thereof constitute one in can making is got and is removed.

The outer nail extension pipe 12 of this intramedullary nail design can also its lower end mouth of pipe be the pipeline section with internal thread, the near-end mouth of pipe of corresponding outer nail 3 is with externally threaded pipeline section, internal and external screw thread cooperates can to play equally and connects the effect that lengthens outer nail 3 like this, also can consist of inside and outside nail 2,3 and elongated bar, pipe 10,12 and locknut 11 cooperate whole intramedullary nail to be pulled out.

Claims (4)

1, a kind of expansion locking intramedullary pin, it comprises: the inside and outside nail that sleeve is combined together, it is characterized in that: interior nail slightly is longer than outer nail, and outside the far-end mouth of pipe insertion of outer nail, follow closely in the tube chamber, the near-end that stretches out the interior nail of outer nail near-end is one section hollow pipe that has internal and external screw thread, and distal head of nail is provided with support that minor axis is slightly larger than the elliposoidal of the outer nail diameter stifled core that rises in this; The pipeline section at the far-end mouth of pipe place of outer nail is provided with the orderly expansion support claw of breach; The clamp nut that threaded engagement is followed closely in this on near-end external screw thread is followed closely near-end outward by compressing, and insert to rise from the outer nail far-end mouth of pipe and enter in the expansion support claw inner chamber of following closely this outside by the support of following closely in this stifled core that rises, thereby constituting all support claws establishes support and rises and upspring and be fastened on state on this all core spheroid, the promptly inside and outside intramedullary pin with two fixing points that fits in firm one admittedly that clenches.

2, according to the described intramedullary nail locked by expanding function of claim 1, it is characterized in that: one section hollow tube with internal thread of described interior nail near-end, the interior nail elongated bar that can be threaded in its pipe, these rod two ends all are provided with one section screw thread.

3, according to the described expansion locking intramedullary pin of claim 1, it is characterized in that: described outer nail near-end, its mouth of pipe is one section tapped hole enlargement pipeline section, threaded engagement has the outer nail extension pipe that has outer Piao stricture of vagina in this female thread pipeline section, be provided with to pull out on this pipe upper end tube wall and carry side opening, should in nail and elongated bar thereof pass this pipeline section, and be engaged in this on nail elongated bar nail and elongated bar thereof in constituting by locknut--nail and extension pipe thereof--outward locknut is the intramedullary pin to be pulled out of one.

4, according to claim 1 or 3 described expansion locking intramedullary pins, its claim is: described outer nail near-end, its mouth of pipe also can be to have externally threaded pipeline section, this pipeline section threaded engagement has the outer nail extension pipe that has female thread, this pipe upper end also is provided with to pull out carries side opening, should in nail and elongated bar thereof also pass this pipeline section,--nail and extension pipe thereof--the outward intramedullary pin that the locknut all-in-one-piece is to be pulled out that and is engaged in this on nail elongated bar nail and elongated bar thereof in constituting by locknut.