CN2409920Y - Gear type intramedullary nail extractor - Google Patents

Abstract

The utility model relates to a medical gear type intramedullary nail extractor, which is composed of a post, a supporting board, a gear box, a gear, a gear shaft, a rack bar, a half ring nut, a hook, a fulcrum retaining cap, a handle, a spanner and a screw. The utility model is characterized in that the utility model has the advantages of reasonable design, simple structure, novelty and uniqueness, simple operation, easy control and small wound. The utility model is suitable for extracting the clinical intramedullary nail at present, and has no collision injury on neck of femur, femoral head, acetabulum and soft tissues thereof. Especially when the intramedullary nail is fixed for many years or the intramedullary nail has a certain degree bending, using the existing driver-extractor to extract is very difficult or can not extract the nail, however, using the nail extractor can easily and smoothly extract the nail. The fulcrum and the traction force point of the nail extractor are the parallel reversal force, the force component can not be formed, and the nail extractor uses the mechanical traction, so the extracting force is reliable.

Description

Gear type intramedullary pin puller

This utility model is to be used for fracture of shaft of femur row intramedullary pin internal fixation, treat that union of fracture is good after, the medical apparatus and instruments that intramedullary pin is chosen.

Fracture of shaft of femur row intramedullary pin internal fixation is clinically art formulas that adopt more, when treating that union of fracture is good, need intramedullary pin is chosen, the paddle type mill that the past many decades is used so far and the shortcoming of used injection-drawing out device are: its fulcrum is to pass through neck of femur, femoral head arrives at acetabular bone, the collodiaphyseal angle that forms because of neck of femur and femoral shaft is 110 degree～140 degree average out to, 127 degree, so the fulcrum of injection-drawing out device and force then form the component about 26 degree, strength is very not enough so traction is chosen, and beating the bump that pulls out all gives neck of femur at every turn, femoral head, the impact injury that acetabular bone and soft tissue thereof are certain, particularly fixing for many years or when to a certain degree crooked arranged when intramedullary pin, be unable choosing with used injection-drawing out device.

The purpose of this utility model is: develop a kind of gear type intramedullary pin puller, for society provides a kind of reasonable in design, simple in structure, the strength of choosing of modern design uniqueness is big, be applicable to the present puller of choosing of used intramedullary pin clinically, the tooth bar of this puller traction force and the fulcrum of column are parallelly oppositely to put forth effort, no component forms, be again mechanical traction, traction strength is very big and balanced safe so choose, kowtow because of the fulcrum locking cap and to be pressed in the greater trochanter top, so to neck of femur, femoral head, acetabular bone and soft tissue thereof have no impact injury, and be fixing for many years or have when to a certain degree crooked to intramedullary pin especially, with used injection-drawing out device extremely difficulty choose or unable at all choosing, with this puller then can be easier it is chosen, and simple to operate, be easy to grasp, wound is little, the strength of choosing is big, and not having bad stimulation is its principal character.

The purpose of this utility model is achieved in that by column, supporting plate, gear-box, gear, gear shaft, tooth bar, semi-ring nut, hook, fulcrum locking cap, handle, spanner, screw and constitutes.Material is rustless steel or metal chromium plating, the operation that intramedullary pin is chosen, with quincunx intramedullary pin is example, patient is under anesthesia, sterilization skin, the shop aseptic towel is cut local skin and subcutaneous tissue, appear greater trochanter of femur top and intramedullary pin upper end, the handle that the patient holds puller is kowtowed fulcrum locking cap deep-sawing flank and is pressed in inboard, greater trochanter top, will link up with hook in the uropore of intramedullary pin upper end, and spanner and gear shaft be embedding company mutually, and tighten the screw (see figure 1), the rocking-turn spanner, gear shaft and gear rotate thereupon, carry on the intramedullary pin of tooth bar and hook hook is also slow synchronously, until intramedullary pin is chosen, finish the operating process of choosing.

Below in conjunction with drawings and Examples this utility model is further specified.

Fig. 1, be this utility model side front schematic view.

Fig. 2, be the positive side schematic view of spanner of Fig. 1.

Fig. 3, be the gear shaft master TV structure sketch map on Fig. 1.

Column 1 can be cylindrical, square column type or lath-shaped, its length is no less than 20 centimetres, cylindrical diameter is no less than 1.0 centimetres, square column type is no less than 0.5 centimetre, lath-shaped is wide to be no less than 1.0 centimetres, thickly be no less than 0.3 centimetre, vertical welding in column 1 upper end or spiral shell rivet clasp are decided supporting plate 2, supporting plate 2 length are no less than 2.5 centimetres, widely be no less than 1.5 centimetres, supporting plate 2 has a crack that allows tooth bar 6 to pass through, its crack length is no less than 1.0 centimetres, widely be no less than 0.5 centimetre, gear-box 3 is housed on the supporting plate 2, two side length is no less than 2.0 centimetres, widely be no less than 1.5 centimetres, front and rear wall is wide to be no less than 0.5 centimetre, gear 4 is housed in the gear-box 3, its diameter is no less than 1.2 centimetres, thickly be no less than 0.2 centimetre, gear shaft 5 is passed by the hole of gear-box 3 two sides, gear shaft 5 diameters are no less than 0.5 centimetre, rectangular crack and gear 4 close embeddings that tooth bar 6 passes through supporting plate 2 connect (see figure 1), tooth bar 6 length are no less than 20 centimetres, generously be no less than 0.5 centimetre, the lower end of tooth bar 6 is connected with semi-ring nut 7, hook 8 is connected with semi-ring nut 7 hooks alive, the lower end of column 1 is connected with 9 welding of fulcrum locking cap or spiral shell riveting, one side of fulcrum locking cap 9 subtend tooth bars 6 is deep-sawing dentation or bodkin shape structure (see figure 1), it is damaged that its both sides are half arc, fulcrum locking cap 9 diameters are no less than 1.5 centimetres, be no less than 0.5 centimetre deeply, handle 10 (see figure 1)s are equipped with on column 1 top, the arm of force of the spanner 11 among Fig. 1 can be converted into rectangular-shaped, when needing big strength, switching the arm of force can be become straight (see figure 1), spanner 11 and gear shaft 5 embedding mutually connect, and tighten screw 12 (see figure 1) that is fixed as one, when choosing intramedullary pin, fulcrum usefulness is decided medicated cap 9 deep-sawing flanks, thrust inboard, greater trochanter top, kowtow and be pressed in the greater trochanter top, link up with 8 hooks in the uropore of intramedullary pin upper end, rocking-turn this moment spanner 11, gear shaft 5, gear 4 rotates tooth bar 6 thereupon, the intramedullary pin of linking up with 8 hooks is also carried on synchronously, intramedullary pin is chosen on continuous ground, finishes the operation of choosing.

Carry out choosing of intramedullary pin with this utility model following advantage is compared with prior art arranged: this puller is reasonable in design, simple in structure, unique its fulcrum of modern design becomes parallel with the traction force and oppositely puts forth effort, both do not have component and form, be again mechanical traction, strength is very big and safe so choose, neck of femur, femoral head, acetabular bone and soft tissue thereof had no impact injury, especially intramedullary pin is fixed for many years or generation incliner to a certain degree, with this puller then can be easier choose, and it is simple to operate, be easy to grasp, wound is few, does not have bad stimulation and is its characteristics.

Claims (3)

1, a kind of medical gear type intramedullary pin puller is to be made of column (1), supporting plate (2), gear-box (3), gear (4), gear shaft (5), tooth bar (6), semi-ring nut (7), hook (8), fulcrum locking cap (9), handle (10), spanner (11), screw (12), it is characterized in that: vertical welding in column (1) upper end or spiral shell rivet clasp are decided supporting plate (2), supporting plate (2) has a crack that allows tooth bar (6) to pass through, gear-box (3) is housed on the supporting plate (2), gear (4) is housed in the gear-box (3); Gear shaft (5) is passed by gear-box (3) both sides cinclides, crack and the close embedding of gear (4) that tooth bar (6) passes through supporting plate (2) connect, the lower end of tooth bar (6) is connected with semi-ring nut (7), hook (8) and semi-ring nut (7) be hook company mutually, column (1) lower end is connected with fulcrum locking cap (9) welding or spiral shell riveting, one side of fulcrum locking cap (9) subtend tooth bar (6) is deep-sawing dentation or bodkin spline structure, it is damaged that its both sides are half arc, handle (10) is equipped with on column (1) top, spanner (11) and gear shaft (5) embedding mutually connect, and tighten screw (12) and fixed.Spanner (11) can be folded into 90 degree when needing.

2, according to the described gear type intramedullary pin of claim 1 puller, it is characterized in that: column (1) can be cylindrical, square column type and lath-shaped.

3, according to the described gear type intramedullary pin of claim 1 puller, it is characterized in that: material therefor is that metal chromium plating or rustless steel are made.

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