Abstract:
The canulated titanium implant (screw) for correction of flat feet in children characterized by that: a) the diameter of the stem is D=4,8mm±25%, recommended 4,8mm±10%, and especially recommended 4,8mm, b) it is canulated, whose diameter is C=2mm+25%, recommended 2mm±10%, and especially recommended 2mm, c) the screw-thread height is l,15mm±25%, recommended l/15mm±10%, and especially recommended 1,15mm, d) on the point of the screw, which ends at the angle of 90°, on the apex thread are trisect cuts at the angle of 120°. The edges of the apex thread are cut at the angle of 55°. At the very top of the point of the screw, the trisect cuts of the apex thread go inward the tunnel in the length of the screw by 1,5mm, e) this type of the point replaces the use of the drill and the tapping device.
Abstract:
A bone fixing device and a method of distracting a fracture are described. The bone fixing device has threads at both a leading end (240) and a trailing end (230), and the pitch of the threads (235, 245) are greater at the trailing end. This causes the leading end of the bone fixing device to travel more slowly through the bone than the trailing end, which loads the threads of the screw to put the screw under compression, so that the threads bite more effectively into the bone. A jig and method for insertion of two bone fixing devices are also described. The jig defines parallel planes of insertion which cross when viewed in a direction perpendicular to the parallel planes.
Abstract:
Die Vorrichtung zur Knochenfixation umfasst eine aus einem polymeren Material gefertigte Knochenplatte (1) mit einer Oberseite (2), einer zur Anlage an den Knochen bestimmten Unterseite (3) und N ≥ 2 die Oberseite (2) mit der Unterseite (3) verbindende Plattenlöcher (4) des Durchmessers „D" und mit einer Lochachse (5) und mehrere, zur Einführung in die N Plattenlöcher (4) bestimmte, longitudinale Knochenfixationselemente (10) mit einem Aussengewinde (11) vom Durchmesser „A" und einem Kerndurchmesser „K". Dabei gilt die Beziehung K
Abstract:
The invention relates to self-compressing screws and advantageously self-threading screws. The inventive screw is characterised essentially in that it comprises a screw shaft (1) having an axis of revolution (2), said screw shaft (1) being provided with two threads (11, 22) that are centred on the axis of revolution, and in that the first envelope (15) in the form of a rotary hollow cylinder defined by the thread (11), between the base (12) and the tip (13) of an individual thread section (14), entirely fits inside the second envelope (25) in the form of a rotary hollow cylinder defined by the thread (22), between the base (23) and the tip (24) of an individual thread section (25), the pitch P11 of the thread (11) being smaller than the pitch P22 of the thread (22). The invention also relates to the application of said screw for joining two bone segments in order to perform an osteosynthesis operation between said two bone segments.
Abstract:
A spine fixation assembly (100) connecting a first (92) and a second (94) vertebra includes first (112) and second (110) elongated plates that form an X-shaped structure (Figure 2A, Figure 6). The first elongated plate has a first (112a) and a second (112b) end that are attached to a first location of the first vertebra and to a second location of the second vertebra, respectively. The second elongated plate (110) has a first (110a) and a second (110b) end that are attached to a second location of the first vertebra and to a first location of the second vertebra, respectively. The ends of the plates are attached to the various locations of the vertebra via screws (120a, 120b, 122a and 122b) or hooks. The elongated plates may have adjustable length, may be rotated around a central axis passing through the center of the X-shaped structure and may be cross-coupled to each other via a screw. A third (114) and fourth (116) elongated plate may be attached horizontally across the top and bottom of the X-shaped structure, respectively.
Abstract:
An internal fixation pin (10) comprises first (12) and second portions (14) with threads of different diameters, but having the same pitch and thread depth. The first portion (12) includes a self-tapping tip (20). No enlarged head portion is provided to the pin at the end opposite the tip. A non-threaded shaft portion (26) is frangibly connected to the second portion (14) and is a mechanism for rotating the pin for threaded insertion into bone. A plurality of circumferentially spaced-apart longitudinal grooves (30) are provided on the second portion (14) adjacent its intersection with the shaft portion (26). After insertion of the first (12) and second portions (14) across a fracture, the shaft portion (26) is removed. The grooves (30) permit rotation of the pin for removal should removal be necessary. A driver (40) for pin removal is also provided, as well as a mill tool (60).
Abstract:
An interference screw is provided by machining a fragment of autograft, allograft or xenograft cortical bone from a donor or from a recipient's amputated bone. The interference screw has a cortical surface into which a self-tapping thread is machined. The interference screw has a machined pointed, rounded or flush end and an opposite machined end which mates with a drive means, and has advantages over conventional interference screws known in the art in that subsequent to implantation, no residual hardware that must later be removed remains at the implant site.
Abstract:
A method for securing soft tissue to bone with excellent pull-out strength which does not require the surgeon to tie suture knots to secure the tissue to the bone. A blind hole or socket is created in the bone at the location the graft is to be secured. Preferably, suture is then passed through the graft at desired points. A cannulated driver is pre-loaded with a cannulated plug or screw slidably disposed onto the distal portion of the driver. In a preferred embodiment, a separate piece of suture is passed through the cannula of the driver with a loop end of that suture exposed at the distal end of the driver. The ends of the suture attached to the graft are fed through the suture loop at the end of the driver. Alternatively, the graft itself may be fed through the suture loop, in which case it is not necessary to attach suture through the graft. In another embodiment, the suture loop exposed at the distal end of the cannula of the driver may be omitted, and the sutures attached to the graft may then be fed through the driver cannula from the distal end to position the graft relative to the driver. The driver is inserted into the hole with the screw or plug just outside the hole. Tension is then placed on the suture. Once adequate tension is achieved on the suture, the driver is pressed into the hole, which engages the first thread or bump of the screw or plug on the bone. The screw or plug is then fully advanced into the hole using the driver. When the screw or plug is fully inserted, the suture loop is freed and the driver is removed. The loose ends of the sutures protruding from the anchor site can be cleaned up by clipping them short.
Abstract:
A surgical system that includes a flowable, curable biopolymer and a porous, implantable anchor biomaterial, the anchor material being adapted (e.g., in terms of porosity and chemical compatibility) to permit the flowable biopolymer to infiltrate some or all of the material's pores and there cure in order to retain and anchor the resultant composite material. The composite material can be adapted to encourage new bone ingrowth, in order to stabilize the retention of the implant over extended use. In one embodiment the biopolymer comprises the components of a polyurethane and the porous anchor material comprises a reticulated open cell carbon foam infiltrated with tantalum by a process of chemical vapor deposition (CVD).
Abstract:
A Bone implant (1) for stabilizing fractured or non-fractured bones comprises an implant body (2), preferably a cylindrical body, extending along a longitudinal axis (3) from a front side (4) to an end side (5). The implant has an implant width (6) ex- tending perpendicularly to the longitudinal axis (3), wherein a length of the implant body (2) along the longitudinal axis (3) is at least 5 times the implant width (6). The implant body (2) has an outer surface, being at least divided into a first sur- face (7) and a second surface (8. The first surface (7) consists of an anchorage area (9) which extends at least partially over the outer surface, preferably maximum over half of the outer surface.