CN2803294Y

CN2803294Y - Internal fixing frame for foot bone

Info

Publication number: CN2803294Y
Application number: CN 200520030846
Authority: CN
Inventors: 孙永强
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-06-02
Filing date: 2005-06-02
Publication date: 2006-08-09
Anticipated expiration: 2015-06-02

Abstract

The utility model discloses an internal fixing frame for a foot bone, which is composed of fixed arms provided with screw holes on arm bodies. Screws can pass through the screw holes to fix the fixed arms onto the surface of a calcaneus. The utility model is characterized in that the fixed arms comprise a front side arm, a back side arm and a lower arm which are connected together, presenting a triangular frame structure; the shape of the triangular frame composed of the front side arm, the back side arm and the lower arm is coincided with the shapes of densely distributed regions of a bone trabecula of a calcaneus; an upper top of the triangular frame corresponds to a hill part of a calcaneus and the left and the right lower tops respectively correspond to a tuberculum part and a front part of a calcaneus. The three tops of the triangular frame respectively correspond to the hill part, the tuberculum part and the front part of a calcaneus. The triangular frame structure has the characteristics that the structure is steady, abilities of press resistance and torsion resistance are strong, and force born on the tops is distributed to the side arms. Stress raisers of the calcaneus can be effective fixed and a frail part of a calcaneus body part is furled and reinforced, playing a favorable fixing effect.

Description

A kind of calcaneus inner fixed stand

Technical field

This utility model relates to orthopedic medical device, especially a kind of calcaneus inner fixed stand.

Background technology

Fracture of calcaneus is common clinical, frequently-occurring disease; Therapeutic Method mainly contains two classes; one class is a non-operative treatment; after calcaneus carried out maneuver regulation from the outside; reinforce with Gypsum Fibrosum or the external fixator calcaneus after to regulation and to cure the wound; this class therapeutic modality usually can stay sequela to the patient because of the manual reduction operating difficulties of outside.Another kind of is operative treatment, promptly cuts the skin layer around the calcaneus, in the enterprising horizontal reset regulation of exposed calcaneus, inner fixed stand is installed on calcaneus is then fixed, to help the calcaneus healing that resets.What use always at present clinical is the operative treatment fracture of calcaneus, use more inner fixed stand " Y " type is arranged, " H " type, " three-jaw " type and plasticity calcaneus titanium alloy steel plate, but its fixed effect is not very good, especially because human body when upright the suffered downward heavy burden of calcaneus bigger, and existing inner fixed stand only is that the calcaneus that ruptures is played traction action, its structure can not help calcaneus to decompose downward heavy burden, its support force can't bear the heavy burden of calcaneus, therefore be difficult to effectively correct the dislocation of calcaneus, like this will be unfavorable to resuming treatment of postoperative, cause unsatisfactory curative effect; In addition, the structure of calcaneus and bone trabecula distribute as Fig. 1, shown in Figure 2, zone 6 among the figure is a mound portion, zone 7 is a tuberal part, zone 8 is a body, zone 9 is anterior, as can be seen from the figure, three groups of bone trabecula of calcaneus are sealene triangle, the triangle point upward is positioned at the mound portion of calcaneus, the bone trabecula dense place that distributes is the eburnation part of calcaneus, also be the zone that the suffered stress ratio of calcaneus is concentrated, the triangle middle part is at the cavity of a bone trabecula rareness of body formation of calcaneus, and this place is the structure weakness of calcaneus, need draw in this from the outside fixing, and present inner fixed stand and all not designing according to the distribution of sclerotin density and the stress distribution characteristics of calcaneus.

The utility model content

The purpose of this utility model is to provide a kind of calcaneus inner fixed stand, can effectively decompose the suffered down load of calcaneus to reach the heavy burden requirement of calcaneus, and the biomechanics characteristic that structure meets calcaneus can produce support force preferably to fracture of calcaneus, has resistance to compression preferably, tension and torsional strength.

The technical solution of the utility model is: a kind of calcaneus inner fixed stand, constitute by the fixed arm that has screw on the arm body, described screw can penetrate fixed arm is fixed on the calcaneus surface for screw, it is characterized in that: described fixed arm comprises preceding side arm, posterolateral arm, the underarm that frame structure triangular in shape links together, and the shape in the shape of the triangular framing that described preceding side arm, posterolateral arm, underarm are constituted and the bone trabecular dense distribution zone of calcaneus matches.

Described posterolateral arm middle part is connected with stretch arm, and the intersection of preceding side arm and underarm is connected with the reinforcement arm, and the intersection of described preceding side arm, underarm and reinforcement arm has the arc-shaped recess that can adapt to the anterior convex surfaces of calcaneus.

The triangle that side arm, posterolateral arm, underarm are constituted before described is an isosceles right triangle, be 90 ° of angles between preceding side arm and the posterolateral arm, preceding side arm and posterolateral arm all and between the underarm all are 45 ° of angles, and stretch arm and underarm are 21 ° of angles, strengthen arm 5 and are 45 ° of angles with underarm.

Side arm has the screw that can correspondingly be fixed in the portion of calcaneus mound with the junction that crosses of posterolateral arm before described, posterolateral arm has with the junction that crosses of underarm can correspondingly be fixed in the screw of calcaneal tuberosity subordinate portion, posterolateral arm has the screw that can correspondingly be fixed between tuberal part and the body with the junction of stretch arm, the end of calcaneus stretch arm has the screw that can corresponding be fixed in calcaneal tuberosity portion upper back, before the middle part of side arm have oval screw and squeeze into the sustentaculum tali at the calcaneus back side with attachment screw, strengthen having and can correspondence being fixed in the forward screw of calcaneus on the arm.Has the screw that can corresponding be fixed in the calcaneus body on the underarm.

The calcaneus inner fixed stand that this utility model is designed, fixed arm with frame structure triangular in shape, leg-of-mutton three summits are the mound portion of corresponding calcaneus respectively, tuberal part is with anterior, because it is firm that triangular frame structure has structure, resistance to compression, anti-twisting property is strong, the stressed characteristic in summit to side arm component, so the suffered down load of calcaneus mound portion just can be to two side arms: preceding side arm, posterolateral arm decomposes, make the minimizing that suffers oppression of calcaneus mound portion, therefore calcaneus inner fixed stand of the present utility model can play good supporting and does in order to reach the heavy burden requirement of calcaneus; And the shape of this triangular framing is that shape with the bone trabecular dense distribution zone of calcaneus matches, the biological line of force that meets calcaneus distributes, the effectively fixing stress raiser of calcaneus, and draw the fragile part in calcaneus body place in reinforcing, play good fixation.

In addition, the reinforcement arm and the stretch arm of auxiliary fixation also have been connected with on the triangular framing, strengthen the intersection that arm is connected preceding side arm and underarm, this intersection has the arc-shaped recess that can adapt to the anterior convex surfaces of calcaneus, the design of strengthening arm and this place's arc-shaped recess all is for the forward convex surfaces of better fit calcaneus, is fitted in fixed mount and calcaneus surface and closely is beneficial to fix.The stretch arm that the posterolateral arm middle part connects is the calcaneal tuberosity upper back fixedly, can draw the fixedly tuberal part of calcaneus in.

Description of drawings

Fig. 1 is the sketch map of human body calcaneus;

Fig. 2 is the bone trabecular distribution line chart of calcaneus;

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

Fig. 4 is a perspective view of the present utility model;

Fig. 5 is the sketch map of this utility model when clinical use.

The specific embodiment

As shown in Figure 3, Figure 4, the calcaneus inner fixed stand of this utility model design, material is the TC4 titanium alloy, thick 1.5mm.Constitute by preceding side arm 1, posterolateral arm 2, underarm 3, stretch arm 4, reinforcement arm 5.Preceding side arm 1, posterolateral arm 2 constitutes an isosceles right triangle with underarm 3, be 90 ° of angles between preceding side arm 1 and the posterolateral arm 2, preceding side arm 1 and posterolateral arm 2 all are 45 ° of angles with underarm, stretch arm 4 is connected the middle part of posterolateral arm 2, stretch arm 4 is 21 ° of angles with underarm, strengthen the intersection that arm 5 is connected preceding side arm 1 and underarm 3, strengthen arm 5 and be 45 ° of angles with underarm, preceding side arm 1, the medial surface of underarm 3 and reinforcement arm 5 intersections has an arc-shaped recess 10, this arc-shaped recess 9 is for the convex surface anatomic form at 9 places, front portion that adapt to calcaneus, can play better fixation.The junction that crosses of preceding side arm 1 and posterolateral arm 2---the leg-of-mutton place, summit of going up has a screw 10, posterolateral arm 2 has a screw 11 with the junction of stretch arm 4, the end of stretch arm 4 also has a screw 12, the junction that crosses of posterolateral arm 2 and underarm 3---place, summit, leg-of-mutton lower-left has a screw 13, also have two screws 14 on the underarm 3 in addition, 15, have 2 screws 16 on the reinforcement arm 5 at place, summit, leg-of-mutton bottom right, 17, above

screw

10,11,12,13,14,15,16,17 are circular screw, the middle part of preceding side arm 1 also has an oval-shaped screw 18, the at present employed design that this oval screw is all arranged in this position with inner fixer, this ellipse screw 18 is the mound portion 6 of corresponding calcaneus and anterior 9 junction when clinical use, the back side at this place has a ledge that is called sustentaculum tali, ellipse screw 18 be exactly for be applicable to different angles screw is squeezed into the calcaneus another side sustentaculum tali on, to meet the requirement of medical treatment.

As shown in Figure 5, during clinical use, a plurality of full gomphiasis matter bone screw 19 are hammered into calcaneus by each screw on the calcaneus inner fixed stand, it is fixing that the calcaneus inner fixed stand is combined with calcaneus, before, posterolateral arm 1,2 summits that cross are used for fixing calcaneus mound portion 6, there is an ellipse screw at the middle part of preceding side arm 1, screw is squeezed on the sustentaculum tali of calcaneus another side to be applicable in different angles, posterolateral arm 2 crosses by calcaneus body 8 and underarm 3, the rear lower that is used for fixing calcaneal tuberosity portion 7, stretch arm 4 is used for fixing the calcaneal tuberosity upper back, strengthen arm 5 and be used for fixing calcaneus front portion 9, preceding side arm 1, the arc-shaped recess 10 of underarm 3 and reinforcement arm 5 intersections can allow fixed mount be attached at the outer surface of calcaneus front portion 9 closely, can avoid sclerite to rotate.

This utility model is when clinical use, in conjunction with Fig. 2, Fig. 5 as can be seen, the summit of the triangular structure of calcaneus inner fixed stand is positioned at the mound portion 6 of calcaneus, can be with the suffered down load of calcaneus to two side arms: preceding side arm 1, posterolateral arm 2 decompose, make the minimizing that suffers oppression of calcaneus mound portion, therefore calcaneus inner fixed stand of the present utility model can play good supporting and does in order to reach the heavy burden requirement of calcaneus; And as can be seen in conjunction with Fig. 2, Fig. 5, three limits of the triangular structure of calcaneus inner fixed stand: the position of preceding side arm 1, posterolateral arm 2, underarm 3 is the bone trabecular distributing position of corresponding calcaneus basically, the biological line of force that meets calcaneus distributes, the effectively fixing stress raiser of calcaneus, and draw the fragile part in calcaneus body 8 places in reinforcing, play good fixation.

Claims

1, a kind of calcaneus inner fixed stand, constitute by the fixed arm that has screw on the arm body, described screw can penetrate fixed arm is fixed on the calcaneus surface for screw, it is characterized in that: described fixed arm comprises preceding side arm, posterolateral arm, the underarm that frame structure triangular in shape links together, the shape in the shape of the triangular framing that side arm, posterolateral arm, underarm are constituted before described and the bone trabecular dense distribution zone of calcaneus matches, the mound portion of the corresponding calcaneus in last summit of triangular framing, two left and right respectively corresponding calcaneal tuberosity portions of summit down and anterior.

2, according to the described calcaneus inner fixed stand of claim 1, it is characterized in that: described posterolateral arm middle part is connected with stretch arm, the intersection of preceding side arm and underarm is connected with the reinforcement arm, and the intersection of described preceding side arm, underarm and reinforcement arm has the arc-shaped recess that can adapt to the anterior convex surfaces of calcaneus.

3, according to the described calcaneus inner fixed stand of claim 2, it is characterized in that: the triangle that side arm, posterolateral arm, underarm are constituted before described is an isosceles right triangle, be 90 ° of angles between preceding side arm and the posterolateral arm, preceding side arm and posterolateral arm all and between the underarm all are 45 ° of angles, stretch arm and underarm are 21 ° of angles, strengthen arm (5) and are 45 ° of angles with underarm.

4, according to the described calcaneus inner fixed stand of claim 3, it is characterized in that: side arm has the screw that can correspondingly be fixed in the portion of calcaneus mound with the junction that crosses of posterolateral arm before described, posterolateral arm has with the junction that crosses of underarm can correspondingly be fixed in the screw of calcaneal tuberosity subordinate portion, posterolateral arm has the screw that can correspondingly be fixed between tuberal part and the body with the junction of stretch arm, the end of calcaneus stretch arm has the screw that can corresponding be fixed in calcaneal tuberosity portion upper back, the middle part of preceding side arm has oval screw is squeezed into the calcaneus back side with attachment screw sustentaculum tali, strengthen having and correspondence to be fixed in the forward screw of calcaneus on the arm, have the screw that can corresponding be fixed in the calcaneus body on the underarm.