Source: https://patents.justia.com/patent/20080234734
Timestamp: 2020-02-25 10:15:44
Document Index: 794463662

Matched Legal Cases: ['art 20', 'art 22', 'art 20', 'art 20', 'art 20', 'art 20', 'art 20']

US Patent Application for PEDICLE SCREW FOR INTERVERTEBRAL SUPPORT ELEMENTS Patent Application (Application #20080234734 issued September 25, 2008) - Justia Patents Search
Justia Patents Spinal Positioner Or StabilizerUS Patent Application for PEDICLE SCREW FOR INTERVERTEBRAL SUPPORT ELEMENTS Patent Application (Application #20080234734)
A first embodiment of the head 2 of a pedicle screw 1 in accordance with the invention is illustrated in FIG. 4 together with a support element 3. A part 20 of the head 2 which comprises two lugs 20a and 20b and which is firmly connected to the shaft 10 contains a base groove 21 which is oriented transversely to the shaft 10 and a thread 24. A part of the band 31 which is to be secured is inserted into the base groove 21 during the securing of the support element 3 and is fixed with a screw 22. The base groove 21 has a shape which corresponds to the shape of the band in such a manner that the base groove is formed complementarily in the insertion region. An edge region 21′ of the base groove 21 can—in order to prevent a damage to the inserted band 31—be formed in such a manner that the base groove 21 widens in the direction towards the contact surface 23.
The embodiment of FIG. 4 is a first example of a pedicle screw in accordance with the invention, in which the lugs 20a, 20b, which form flanks of the base groove 21, have depressions 24 on their inner sides into which a securing part, namely the screw 22, can be firmly anchored by means of a form lock. After the production of the form lock the lugs 20a, 20b are advantageously elastically spread apart somewhat by the securing part 22, so that the position of the latter is additionally fixed as a result of an increased adhesive friction and thus of a force lock.
A second example is shown in FIG. 5, in which the lugs 20a, 20b have groove-like depressions 24a on their inner sides. A T-shaped groovestone 25 with lateral ribs 25a is pushed in between the grooves 24a after the insertion of the band 31—cf. FIG. 5—and for fixing the band 31a setting screw 22—cf. FIG. 5—is screwed into a bore in the groove-stone 25 with inner thread 250.
FIG. 8 shows a head 2 with a core part 20 and with a connector 27 which is a sleeve-like part and the inner space of which has a square profile which is formed by planar surfaces. The core part 20 is tightly enclosed by the connector 27, so that a spreading open of the lugs 20a, 20b during the screwing in of a screw 22 (see FIG. 10) into the thread 24 is prevented.
FIG. 11 shows a further embodiment of the head 2 with a connector 29. The band 31 can be secured in the connector 29 in a bore 293. During the operation the connector 29, which contains the band 31, is placed onto the core part 20 of the head 2, with a connecting piece 292 of the connector 29, which has a prismatic shape, being laid in into the corresponding complementarily shaped groove 21. The securing between the connector 29 and the core part 20 can be produced for example with two screws. The non-illustrated screws are inserted through bores 291a of the connector 29 and are screwed tight in threaded bores 291b of the core part 20.
Publication number: 20080234734
Patent Grant number: 7758618
Inventors: Reto Walder (Pfungen), Reto Braunschweiler (Neftenbach)
Application Number: 12/128,744
Current U.S. Class: Spinal Positioner Or Stabilizer (606/246); Threaded Fastener Element (606/301); Head Structure (606/305)