CN103654934B - For blade plate combined locking screw and comprise its bone plate system - Google Patents

Abstract

The invention provides a kind of combined locking screw for blade plate and comprise its bone plate system, it is particularly suitable for fracture bone plate.Described lock screw comprises bone screw for implant into body and Lock Part, bone screw is provided with the through hole of the angle that to tilt relative to its longitudinal axis on head portion, extend through for Lock Part, and described through hole is provided with engagement device on the inwall of hole, the corresponding engagement device on coalescing lock parts.Combined locking screw of the present invention avoids fracture bone plate system weak point, and performance meets or exceeds locking steel plate system, and price is low, operation technique is simple.

Description

For blade plate combined locking screw and comprise its bone plate system

Technical field

The present invention relates to medical device implants, be specifically related to lock screw and the bone plate system of use in orthopedic injury treatment operation.

Background technology

The object of fracture surgical operation therapy is to rebuild dissection and restore funcitons.According to AO(ASIF) principle, Fracture internal fixaiion is the comprehensive treatment on a kind of basis building on accurate fracture anatomical reduction, stable fixing, blood fortune (blood supply) that retains bone as far as possible, early function sexual activity.

What Fracture internal fixaiion adopted in early days is fracture bone plate technology.But fracture bone plate system not can be used for the structure locked, and makes the connection of the screw of fracture bone plate system and blade plate not formed fixing.So, there is biomechanics defect in fracture bone plate system: oppresses periosteum, affects fracture end blood supply, this causes traditional plate osteosynthesis fixedly secured to have quite high complication rate, comprises infection, Plate break, delayed union and disunion.

Development in recent years locking bone fracture plate technology, it relies on the connection of the taper thread on synthetism plate hole and lock screw head taper thread to produce locking effect.Locking bone fracture plate system does not rely on the frictional force between bone-steel plate interface, thus reduces the damage of periosteum, remains the blood fortune of bone as much as possible.The stability of locking bone fracture plate system maintains by the interface had between the screw of angle stabilization and steel plate.Because this locking inner fixer has stable globality, the resisting pull out forces of the screw of its elongated insertion part comparatively plain screw exceeds a lot, and therefore the utilization commercially of current lock blade plate technology gets more and more.

Chinese invention patent application CN201110003221.0 discloses a kind of steel plate screw system with universal lock screw, and this system comprises the lock screw that steel plate and at least two have the taper head of a nail.

Chinese utility model patent CN201020132646.2 discloses a kind of locking steel plate device of fix bone, and the first locking bushing that it comprises lock screw, offers the locking steel plate in locking screw thread hole, external diameter is consistent with the head of lock screw and internal diameter are slightly larger than the second locking bushing of the head of lock screw.

Chinese utility model patent CN200920026695.5 discloses a kind of fixing system in locking plate at proximal end of thighbone, its structure comprises lockplate, lock screw, lockplate upper end-face edge has sewing hole, tuberosity hook is fixed on sewing hole by retainer ring, lockplate top has neck of femur locking nail, and nail is fixed with neck of femur locking nail by screw thread.

But, although the connection of the lock screw of locking bone fracture plate system and blade plate can be formed fixing, resistance to plucking output capacity and the radial anti-rotation performance of lock screw axis are undesirable.And locking bone fracture plate comparatively general steel plate is far expensive, and some fracture also need not be treated with locking bone fracture plate.In addition, be difficult in operation utilize locking bone fracture plate fully to reset to fracture, especially only have the special plate of lock hole.In this case, before Interal fixation, must first by fracture end reduction.Once lock screw squeezes into epiphysis through steel plate, epiphysis is not just by squeezing into other screw or using the modes such as pressue device to adjust position.

Summary of the invention

The connection that the object of the invention is the screw and blade plate solving fracture bone plate system can not form the resistance to plucking output capacity of the lock screw axis after the lock screw of fixing problem and locking bone fracture plate system and the connection of blade plate and the problem of radial anti-rotation performance deficiency.

According to a first aspect of the invention, a kind of combined locking screw for blade plate is provided, is particularly suitable for fracture bone plate system.Described lock screw comprises bone screw for implant into body and Lock Part, bone screw is provided with the through hole of the angle that to tilt relative to its longitudinal axis on head portion, extend through for Lock Part, and described through hole is provided with engagement device on the inwall of hole, the corresponding engagement device on coalescing lock parts.In an embodiment of the present invention, the engagement device of bone screw and the engagement device of Lock Part comprise screw thread, and Lock Part is locking nail.

According to the present invention, the angle that through hole tilts relative to the longitudinal axis of bone screw is between 10 °-30 °.

According to embodiments of the invention, Lock Part can comprise the lock part, front end that is provided with engagement device and be connected to lock part, front end and broken end section.In an embodiment of the present invention, Lock Part is locking pin, and lock part, front end is locking shank, and end section is then empennage, and locking shank is provided with holding tank on the one end be connected with empennage.In the case, when implanting, clamping empennage by clamping device and implanting locking pin, and when taking out, clamping holding tank when empennage fractures by clamping device and taking out locking shank.

According to another embodiment of the present invention, the head of bone screw comprises interior Flos Mume, so that implant and take out bone screw.Equally, the head of Lock Part comprises interior hexagonal, so that implant and take out Lock Part.

According to a second aspect of the invention, provide a kind of bone plate system, it comprises blade plate and one or more above-mentioned combined locking screw.Can according to the several combined locking screw of the fracture situation choice for use of patient.

The present invention can make fracture bone plate and combined locking screw form stable entirety by common bone screw of the prior art is changed over combined locking screw when adopting fracture bone plate, improves fracture bone plate system.Combined locking screw of the present invention avoids fracture bone plate system weak point, and performance meets or exceeds locking steel plate system, and price is low, operation technique is simple.

Accompanying drawing explanation

By with reference to the accompanying drawings to the detailed description that the embodiment of the present invention is carried out, feature of the present invention and advantage thereof will be apparent.In the drawings:

Fig. 1 is the view of the combined locking screw according to the embodiment of the present invention.

Fig. 2 is the fracture bone plate system view according to the combined locking screw with the embodiment of the present invention, and wherein lock screw has loaded in the hole of blade plate.

Fig. 3 A-3C is the front view of the bone screw of combined locking screw according to the embodiment of the present invention, the profile of A-A along the line and perspective view respectively.

Fig. 4 is the perspective view of the locking nail of combined locking screw according to the embodiment of the present invention.

Fig. 5 is the perspective view of combined locking screw according to another embodiment of the present invention.

Fig. 6 is the perspective view of the locking pin of combined locking screw according to another embodiment of the present invention.

Fig. 7 is the perspective view according to another embodiment of the present invention after combined locking screw installation in position.

Reference numerals list

1, combined locking screw 2, locking nail 3, bone screw

1 ', combined locking screw 3 ', bone screw 4, locking pin

5, interior Flos Mume 6, skewed screw hole 7, locking nail bar

8, ailhead 9, interior hexagonal 10, empennage is locked

11, holding tank 12, locking shank 13, bone-fracture fixation steel plate

Detailed description of the invention

With reference to the accompanying drawings embodiments of the invention are described.

Embodiment 1

Fig. 1 shows assembling all-in-one-piece combined locking screw 1, and it comprises bone screw 3 and locking nail 2.Bone screw 3 as shown in figs. 3 a-3 c, is provided with interior Flos Mume 5 on head portion, so that implant and take out bone screw 3.In addition, bone screw 3 is also provided with the skewed screw hole 6 running through head on head portion.In this example, the longitudinal axis angle a of skewed screw hole 6 and bone screw 3 is between 10 ° ~ 30 °.Skewed screw hole diameter is 2.5 ~ 6.0mm.

As shown in Figure 4, it comprises the locking nail bar 7 of front end and the locking ailhead 8 of tail end to locking nail 2, and locking nail bar 7 is in implant into body, and locking ailhead 8 is provided with external screw thread, engages with the female thread of the skewed screw hole 6 with bone screw 3.In addition, the tail end of locking nail 2 is provided with interior hexagonal 9, so that implant and take out locking nail 2.In this example, the locking ailhead 8 on locking nail 2 is connected and fixed with double thread with the skewed screw hole 6 of bone screw 3.

During operation, first bone screw 3 is pressed the operational approach implant into body of fracture bone plate technology.Then, select to increase one or more locking nail 2, by locking nail 2 along skewed screw hole 6 implant into body on bone screw 3, until the locking head on locking nail 2 is all imbedded in the interior Flos Mume 5 of bone screw 3 according to patients with fractures's situation.Fig. 2 shows the bone plate system comprising combined locking screw 1, and wherein 4 lock screw 1 have been installed in the hole of blade plate 13.

Embodiment 2

As shown in Figure 5, combined locking screw 1 ' comprises bone screw 3 ' and locking pin 4.Bone screw 3 ' is substantially identical with the bone screw 3 of embodiment 1.In this example, skewed screw hole diameter 2.5 ~ 10mm, identical with embodiment 1 of angle.

Embodiment 2 is locking pin 4 with the difference of embodiment 1.As shown in Figure 6, locking pin 4 comprises the locking shank 12 of front end, in implant into body, and broken empennage 10.In addition, lock shank 12 and be provided with holding tank 11 on the one end be connected with empennage 10.

During operation, by locking pin 4 along skewed screw hole 6 implant into body on bone screw 3.After implantation puts in place, fracture empennage 10, only leaves the locking shank 12 being provided with holding tank 11, as shown in Figure 7.During implantation, clamp empennage 10 by clamping device (not shown) and implant locking pin 4; During taking-up, clamp holding tank 11 when empennage 10 fractures by clamping device and take out locking shank 12.

Combined locking screw of the present invention can use individually the blade plate of AO standard and screw technology, also can use individually the principle of inner fixed support, can also being combined two kinds of methods.Therefore, the present invention can obtain best clinical effectiveness to the treatment of any fracture.

It will be understood by those skilled in the art that above description is exemplary.When not deviating from thought of the present invention and scope, those skilled in the art can make numerous modifications and variations to the present invention.

Claims (5)

1. the combined locking screw for blade plate, it is characterized in that, described lock screw comprises bone screw for implant into body and Lock Part, bone screw is provided with the through hole of the angle that to tilt relative to its longitudinal axis on head portion, extend through for Lock Part, and described through hole is provided with the first engagement device on the inwall of hole, corresponding second engagement device on coalescing lock parts, described Lock Part is locking pin, described Lock Part comprises the lock part, front end that is provided with described second engagement device and is connected to lock part, front end and broken end section, lock part, described front end is locking shank, described end section is then empennage, described locking shank is provided with holding tank on the one end be connected with described empennage, when implanting, clamping described empennage by clamping device and implanting described locking pin, and when taking out, clamping described holding tank when described empennage fractures by clamping device and taking out described locking shank.

2. combined locking screw according to claim 1, wherein said angle is between 10 °-30 °.

3. the combined locking screw described in claim 1 or 2, the first engagement device of wherein said bone screw and the second engagement device of described Lock Part comprise screw thread.

4. the combined locking screw described in claim 1 or 2, wherein blade plate is fracture bone plate.

5. a bone plate system, it comprises blade plate and the combined locking screw any one of one or more claim 1-4.