CN103099668B - Expanding type extrusion nail - Google Patents

Abstract

The invention relates to an expanding type extrusion nail and belongs to a surgical implant which is used for fixing a tendon implant in a knee anterior cruciate ligament reconstruction surgery. The expanding type extrusion nail comprises an expanding type extrusion nail body, an eccentric toothed rotating rod, a telescopic rod, a telescopic spring and a locking bolt. A threaded stepped hole is formed in one side of the expanding type extrusion nail body. An eccentric toothed rotating rod installing notch is formed in the other side of the expanding type extrusion nail body. Positioning holes are formed in two ends of the eccentric toothed rotating rod installing notch. One surface of the eccentric toothed rotating rod is a smooth surface, and the other surface of the eccentric toothed rotating rod is a toothed surface. A locking groove is formed in the middle of the eccentric toothed rotating rod. The eccentric toothed rotating rod is arranged in the eccentric toothed rotating rod installing notch in an inserted mode. Short shafts which are arranged at the upper end and the lower end of the eccentric toothed rotating rod are arranged in the positioning holes of the two ends of the expanding type extrusion nail in an inserted mode. The telescopic spring is arranged on the telescopic rod in a sleeved mode. The telescopic rod is arranged inside the threaded stepped hole of the middle portion of the expanding type extrusion nail body in an inserted mode. The telescopic rod is compressed tightly by the locking bolt.

Description

Expansion type extruding nail

Technical field

What expansion type extruding nail of the present invention related to is a kind of surgical implant being used for the treatment of due to fixation muscles tendon graft in anterior cruciate ligament of knee joint reconstruction operations.

Background technology

Anterior cruciate ligament be to maintain one of main device that knee joint is stable; the damage of anterior cruciate ligament, fracture can cause instability of knee as malpractice; secondary articular cartilage damage; finally cause the generation of osteoarthritis; have a strong impact on knee joint function; cause patient's daily routines limited, and cause gradually the decline of self-care ability and the forfeiture of self-confidence.

Anterior Cruciate Ligament Ruptures operation can use can absorption interface screw or bone extruding nail carry out tendon graft to be fixed, but can the cutting operation of absorption interface screw to tendon graft, further affected tensile strength and tendon and the knitting of tendon.And bone extruding nail is because surface is relatively smooth, cannot form extruding closely with osseous tunnel.

Summary of the invention

The object of the invention is provides a kind of expansion type extruding nail for above-mentioned weak point, and expansion type extruding nail is reasonable in design, simple in structure, performs the operation easy for installation, reduces patient's misery, is convenient to post-operative recovery.Expansion type extruding nail and tendon graft and osseous tunnel extruding closely, can not cause cutting operation to tendon graft simultaneously.

Expansion type extruding nail of the present invention takes following technical scheme to realize:

Expansion type extruding nail comprises expansion type extruding nail body, eccentric band tooth spiral bull stick, expansion link, coil tension spring and lock-screw.

In expansion type extruding nail body one side, be provided with a screw thread stepped hole, expansion type extruding nail body opposite side is provided with eccentric band tooth spiral bull stick notch is installed, and eccentric band tooth spiral bull stick is installed notch two ends and is provided with locating hole.

Eccentric band tooth spiral bull stick is simultaneously shiny surface, eccentric band tooth spiral bull stick another side is the band flank of tooth, eccentric band tooth spiral bull stick middle part is provided with locking slot, at bias band tooth spiral bull stick upper and lower end, be provided with rotating shaft, in the lower end rotating shaft of bias band tooth spiral bull stick, be provided with interior hex slot, eccentric band tooth spiral bull stick plugs in bias band tooth spiral bull stick is installed notch, and bias plugs in the locating hole of expansion type extruding nail two ends with the rotating shaft of tooth spiral bull stick upper and lower end setting.

Coil tension spring is enclosed within on expansion link, and expansion link plugs in the screw thread stepped hole of extruding nail body middle part, adopts lock-screw to compress expansion link.

Described expansion link utilizes lock-screw by coil tension spring, expansion link arc surface top to be pressed in eccentric band tooth spiral bull stick intermediate channel, in operation process, utilize outer hexagonal spanner rotating eccentricity band tooth spiral bull stick, expansion link is pressed in the locking slot of bias with tooth spiral bull stick.

Described expansion type extruding nail body, eccentric band tooth spiral bull stick, expansion link, coil tension spring and lock-screw all adopt titanium alloy material to make.

Operation principle:

At joint, set up osseous tunnel, implant after the ligamentaum cruciatum of rebuilding, select the expansion type extruding nail of an applicable size, eccentric band tooth spiral bull stick shiny surface is outside, in implantation joint osseous tunnel, compress the ligamentaum cruciatum of rebuilding, utilize outer hexagonal spanner to insert eccentric with rotation in the interior hex slot of tooth spiral bull stick one end, bias is entered in osseous tunnel with the tooth spiral on tooth spiral bull stick, in the locking slot of the eccentric band of simultaneous retractable bar one end embedding tooth spiral bull stick middle part, position fixing.

Expansion type extruding nail advantage:

Expansion type extruding nail is reasonable in design, simple in structure, performs the operation easy for installation, reduces patient's misery, is convenient to post-operative recovery.Expansion type extruding nail and tendon graft and osseous tunnel extruding closely, can not cause cutting operation to tendon graft simultaneously, can well guarantee tensile strength and tendon and the knitting of tendon.

Accompanying drawing explanation

Below with reference to accompanying drawing, the invention will be further described:

Fig. 1 is expansion type extruding nail unused state structural representation.

Fig. 2 is expansion type extruding nail using state structural representation.

Fig. 3 is Fig. 1 expansion type extruding nail unused state structure A-A section diagram.

Fig. 4 is Fig. 2 expansion type extruding nail using state structure B-B section diagram.

Fig. 5 is Fig. 1 expansion type extruding nail unused state expansion link state I partial view.

Fig. 6 is Fig. 2 expansion type extruding nail using state expansion link state I I partial view.

In figure: 1, expansion type extruding nail body, 2, eccentric band tooth spiral turns, 3, the band flank of tooth, 4, locking slot, 5, hexagon ring, 6, flexible, 7, coil tension spring, 8, lock-screw, 9, notch is installed, 10, locating hole, 11, screw thread stepped hole, 12, rotating shaft.

The specific embodiment

With reference to accompanying drawing 1～6, expansion type extruding nail comprises expansion type extruding nail body 1, eccentric band tooth spiral bull stick 2, expansion link 6, coil tension spring 7 and lock-screw 8.

In expansion type extruding nail body 1 one sides, be provided with a screw thread stepped hole 11, expansion type extruding nail body opposite side is provided with eccentric band tooth spiral bull stick notch 9 is installed, and eccentric band tooth spiral bull stick is installed notch 9 two ends and is provided with locating hole 10.

Eccentric band tooth spiral bull stick 2 one sides are shiny surface, eccentric band tooth spiral bull stick 2 another sides are the band flank of tooth 3, eccentric band tooth spiral bull stick middle part is provided with locking slot 4, at bias band tooth spiral bull stick upper and lower end, be provided with rotating shaft 12, in bias band tooth spiral bull stick lower end rotating shaft 12, be provided with interior hex slot 5, eccentric band tooth spiral bull stick plugs in bias band tooth spiral bull stick is installed notch 9, and bias plugs in expansion type extruding nail two ends locating hole 10 with the rotating shaft 12 of tooth spiral bull stick upper and lower end setting.

Coil tension spring 7 is enclosed within on expansion link 6, and expansion link 6 plugs in extruding nail body middle part screw thread stepped hole 11, adopts lock-screw 8 to compress expansion link.

Expansion link 6 utilizes lock-screw 8 by coil tension spring 7, expansion link 6 arc surface tops to be pressed in eccentric band tooth spiral bull stick 2 intermediate channel, in operation process, utilize outer hexagonal spanner rotating eccentricity band tooth spiral bull stick 2, expansion link 6 is pressed in the locking slot 4 of bias with tooth spiral bull stick 2..

Described expansion type extruding nail body 1, eccentric band tooth spiral bull stick 2, expansion link 6, coil tension spring 7 and lock-screw 8 all adopt titanium alloy material to make.

When expansion type extruding nail is used, when outside (accompanying drawing 1) state of bias band tooth spiral bull stick shiny surface, insert in human bone tunnel, utilize outer hexagonal spanner to insert in eccentric band tooth spiral bull stick 2 lower end inner hexagonal holes 5, rotating spanner, bias is clamp-oned in osseous tunnel wall with the band flank of tooth 3 on tooth spiral bull stick 2, utilize coil tension spring 7 that expansion link 6 is sprung in eccentric band tooth spiral bull stick 2 middle part locking slots 4 simultaneously, be with tooth spiral bull stick 2 fixing bias.

Claims (3)

1. an expansion type extruding nail, is characterized in that: comprise expansion type extruding nail body, eccentric band tooth spiral bull stick, expansion link, coil tension spring and lock-screw;

In expansion type extruding nail body one side, be provided with a screw thread stepped hole, expansion type extruding nail body opposite side is provided with eccentric band tooth spiral bull stick notch is installed, and eccentric band tooth spiral bull stick is installed notch two ends and is provided with locating hole;

Eccentric band tooth spiral bull stick is simultaneously shiny surface, eccentric band tooth spiral bull stick another side is the band flank of tooth, eccentric band tooth spiral bull stick middle part is provided with locking slot, at bias band tooth spiral bull stick upper and lower end, be provided with rotating shaft, in the lower end rotating shaft of bias band tooth spiral bull stick, be provided with interior hex slot, eccentric band tooth spiral bull stick plugs in bias band tooth spiral bull stick is installed notch, and bias plugs in the locating hole of expansion type extruding nail two ends with the rotating shaft of tooth spiral bull stick upper and lower end setting;

Coil tension spring is enclosed within on expansion link, and expansion link plugs in the screw thread stepped hole of extruding nail body middle part, adopts lock-screw to compress expansion link.

2. expansion type extruding according to claim 1 is followed closely, it is characterized in that: described expansion link utilizes lock-screw by coil tension spring, expansion link arc surface top to be pressed in eccentric band tooth spiral bull stick intermediate channel, in operation process, utilize outer hexagonal spanner rotating eccentricity band tooth spiral bull stick, can make expansion link be pressed in the locking slot of bias with tooth spiral bull stick.

3. expansion type extruding nail according to claim 1, is characterized in that: described expansion type extruding nail body, eccentric band tooth spiral bull stick, expansion link, coil tension spring and lock-screw all adopt titanium alloy material to make.