Source: http://www.google.com/patents/US20050015095?dq=5958006
Timestamp: 2016-04-29 22:09:33
Document Index: 118415121

Matched Legal Cases: ['art 21', 'art 22', 'arts 21', 'arts 22', 'arts 21', 'arts 22', 'arts 22', 'arts 22', 'arts 22', 'art 22', 'art 32', 'arts 21', 'arts 21', 'arts 21', 'art 21', 'arts 21', 'arts 21', 'arts 21', 'arts 21', 'art 31', 'art 21', 'arts 22', 'arts 22']

Patent US20050015095 - Insertion instrument for cervical prostheses - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsInsertion instrument for a multi-part intervertebral endoprosthesis (9) which comprises two closure plates (91, 92) and a sliding core (93) arranged between these, said insertion instrument having a handgrip part (21, 31), gripping members which hold the closure plates between them, and a force-receiving...http://www.google.com/patents/US20050015095?utm_source=gb-gplus-sharePatent US20050015095 - Insertion instrument for cervical prosthesesAdvanced Patent SearchPublication numberUS20050015095 A1Publication typeApplicationApplication numberUS 10/619,180Publication dateJan 20, 2005Filing dateJul 15, 2003Priority dateJul 15, 2003Also published asCA2532480A1, CN1822804A, CN100528105C, DE502004009361D1, EP1646341A1, EP1646341B1, US7569067, US20060004377, WO2005007044A1Publication number10619180, 619180, US 2005/0015095 A1, US 2005/015095 A1, US 20050015095 A1, US 20050015095A1, US 2005015095 A1, US 2005015095A1, US-A1-20050015095, US-A1-2005015095, US2005/0015095A1, US2005/015095A1, US20050015095 A1, US20050015095A1, US2005015095 A1, US2005015095A1InventorsArnold KellerOriginal AssigneeCervitech, Inc.Export CitationBiBTeX, EndNote, RefManPatent Citations (7), Referenced by (163), Classifications (12), Legal Events (1) External Links: USPTO, USPTO Assignment, EspacenetInsertion instrument for cervical prostheses
[0022] The illustrative embodiment, shown in the figures, of an insertion instrument according to the invention is a forceps, labeled as a whole by reference number 1. It is used for inserting cervical prostheses 9 into the intervertebral space of two adjacent vertebral bodies of the cervical spine (not shown). [0023] The forceps 1 is made up of two forceps halves 2, 3 which are connected to one another movably via a pivot hinge 4. In their rear area, the forceps halves 2, 3 have a respective handgrip part 21, 31 and in their front area they have a respective jaw part 22, 32. The pivot hinge 4 is arranged at the transition between the handgrip parts 21, 31 and the jaw parts 22, 32. It is formed by a pin 42 on the forceps half 2 (in FIG. 1 it extends upward from the plane of the drawing), which pin 42 is mounted in a matching opening 43 in the central area of the other forceps half 3. The bearing pin 42 has a through-bore 44 which runs from the handgrip area of the forceps halves 2, 3 to the jaw area. It will be discussed in more detail later. The pivot hinge 4 allows the handgrip parts 21, 31 of the forceps halves 2, 3 to be moved toward one another so that the jaw parts 22, 32 close, and vice versa. [0024] The jaw parts 22, 32 function as gripping members. In the front area, on their mutually facing inner surfaces, they each have two projections 51, 52 pointing in the tensioning direction 12. These projections are not arranged directly on the jaw parts 22, 32, but instead on jaw inserts 53 which are secured exchangeably, by means of a screw (not shown), in a corresponding recess on the outer surfaces of the jaw parts 22, 32. Each jaw insert 53 has a projection 51 and a projection 52. The projection 51 is formed like a pin and is located in the upper area of the jaw insert 53, while the projection 52 is formed like a small plate and is located in the lower area of the jaw insert 53. The dimensions and arrangement of the projections 51, 52 are adapted to corresponding receiving openings on the cervical prostheses 9 to be received. This will be explained in more detail later. [0025] Arranged on the jaw part 22 there is a guide rail 60 which holds a block 61 such that the latter is longitudinally displaceable in the forward and rearward directions on the forceps half 2. The guide rail 60 is designed as an elongate hole in the jaw insert 53 of the jaw part 32. A grub screw arranged laterally in the block 61 engages in the oblong hole forming the guide rail 60 and guides the block in the longitudinal direction. Instead of the oblong hole, other guide elements can also be provided which allow the block 61 to be guided in forward and rearward movement in the longitudinal direction, for example a dovetail guide. At its front end, the block 61 is provided with an abutment surface 62 designed to cooperate with the cervical prosthesis 9. [0026] The block 61 is engaged by an actuating device 7 which extends from the rear area of the block 61 via the through-bore 44 and into the area between the handgrip parts 21, 31. The actuating device 7 comprises a coupling element 70 for connection to the block 61, which, in the illustrative embodiment shown, is a vertebra support suitable for transmitting shear forces, and it moreover comprises a rod 71 and a handle 72 for actuation. Provided in the front area of the rod 71 there is an external thread 73 which cooperates with a complementary internal thread (not shown) in the through-bore 44 of the pin 42 as an instrument-fixed guide. By turning the handle 72, it is thus possible for the rod 71, and with it the block 61 via the coupling element 70, to be moved backward and forward along the guide rail 60. The handle 72 is designed as a rotatable knob which, on its outer circumference 74, has a suitable surface finish, for example a coarse ribbing 75, to allow the operating surgeon a good grip. [0027] The rear end of the handle 72 is provided with a convex bulge 76. It serves as a strike head for the actuating device 7. Impulses acting on the bulge 76 of the strike head are transmitted by this via the rod 71 of the actuating device 7, the shear-resistant vertebral support 70 and the block 61, to the latter's abutment surface 62. [0028] A locking device 8 for the handgrip parts 21, 31 is provided in the rear area of the forceps 1. This locking device 8 comprises a pivotably movable catch element 83 and a locking pawl 84 (which are arranged opposite one another on the handgrip parts 21, 31), a release device 81, a base 82 and a spring 87. The rear end of the handgrip part 21 is designed as a fork, the locking pawl 84 being formed by a beveling of the base of the fork. The catch element 83 is mounted by the base 82 in the plane enclosed by the handgrip parts 21, 31. The spring 87 is designed as a leaf spring and acts on that end of the catch element 83 mounted in the base 82 in such a way that it is pressed forward to the locking pawl 84. Starting from the base 82, the catch element 83 has a wide area and a narrow area. In its narrow area, the catch element 83 has, on its front face, a toothing 86 into which, when the forceps 1 is closed, the locking pawl 84 engages and is locked, so that the handgrip parts 21, 31 cannot move away from one another and, as a result, the insertion instrument 1 is safeguarded against inadvertently springing open. In this way, it is possible for even substantial loads, for example hammer strikes, to be applied to the bulge 76 on the forceps 1 without any fear of inadvertent opening and without the operating surgeon needing to secure the handgrip parts 21, 31 by manual force against undesired opening. To open the forceps 1 after implantation has been carried out, the catch element 83 is pivoted rearward by applying rearward pressure on the release element 81, by which means the locking pawl 84 is freed from the catch element 83, and the handgrip parts 21, 31 thus move apart from one another under the action of the spring 11. With the forceps 1 in the opened state, the catch element 83 is pivoted rearward counter to the force of the spring 87. Provided in the wide area of the catch element 83 there is a guide 85 which is designed as an oblong hole and which is used to hold the rod 71, even when the forceps 1 is open, in a defined position in the longitudinal axis 10 and to avoid deflection of the rod 71 even under high loads. [0029] Also fixed on the handgrip part 31 there is a leaf spring 11 which is guided round the rod 71 to the other handgrip part 21. With the forceps 1 closed, this leaf spring 11 is tensioned and has the effect that, after release of the catch elements 82 83, the insertion instrument 1 automatically opens to permit removal. [0030] The cooperation with the cervical prosthesis 9 will be described now with reference to FIGS. 3 and 5. The cervical prosthesis 9 consists of an upper closure plate 91 and a lower closure plate 92, with a pivot [sic] element 93 arranged between them. The cervical prosthesis 9 is intended for implantation in the interspace between two adjacent vertebrae of a human cervical spine. The top closure plate 91 is secured to the upper vertebra and the bottom closure pate 92 is secured to the lower vertebra. To arrange the cervical prosthesis 9 securely on the forceps 1 for insertion into the intervertebral space, the top and bottom closure plates 91, 92 have receiving openings on their lateral flanks in the area of their front flange 94, 95. The receiving opening on the top closure plate 91 is designed as a bore 97 with an additional countersink. The receiving opening on the bottom closure plate 92 is designed as a slit 96. In its flange-side area, the sliding core 93 is likewise provided with a slit 96′ which is arranged in such a way that it is flush with the slit 96 of the bottom closure plate 92. The slits 96, 96′ thus result in a continuous groove. [0031] To receive the cervical prosthesis 9 with the forceps 1, the cervical prosthesis 9 is brought into the area between the jaw parts 22, 32 and the forceps 1 is closed, as a result of which the jaw parts 22, 32 move toward one another. In so doing, the projections 51, 52 engage in the corresponding receiving openings of the two closure plates 91, 92, the pins 51 engaging in the bore 97 and the small plates 52 engaging in the slits 96, 96′. In this way, the cervical prosthesis 9, in the tensioning direction, is held free from play on the forceps 1. The different design of the projections 51, 52 and of the receiving openings configured as bores 97 and slits 96 ensures that the cervical prosthesis 9 can be held on the forceps 1 only with the correct orientation. If, as in the illustrated embodiment, the forceps 1 is additionally provided with a marking 14 for the top, this virtually eliminates the possibility of incorrect implantation as a result of incorrect orientation of the cervical prosthesis 9. After the cervical prosthesis 9 has in this way been received in the correct orientation on the forceps 1, the rod 71 can be moved forward via the actuating device 7 by turning the handle 72, with the result that the block 61 comes to lie, from the rear, with its abutment surface 62 on the flange 94, 95 of the cervical prosthesis 9. In doing so, the block 61 tensions the cervical prosthesis 9 against the projections 51, 52 and thus orients the cervical prosthesis 9 in a defined position. Any play existing in the longitudinal axis direction between the projections 51, 52 and the bores 97 and the slits 96 is compensated in this way. The cervical prosthesis 9 is thus held securely and in a precise position on the forceps 1. In addition, the fact that the block 61 bears on the flanges 93, 94 of the two closure plates 91, 92 ensures that the two closure plates 91, 92 do not move away from one another at their front end. This eliminates the possibility of the cervical prosthesis 9 opening, which would prevent successful introduction into the intervertebral space. [0032] It is furthermore made possible to implant cervical prostheses of different height without making changes to the forceps 1. FIG. 3 b shows a cervical prosthesis 9′ which has a thicker sliding core 93′. Like the sliding core 93, it is provided with a slit 96″ which is flush with the slit 96 of the bottom closure plate 92. This configuration of the receiving opening on the bottom closure plate 92 as a slit 96 and its continuation as slit 96″ in the sliding core 93′ ensure that the thicker cervical prosthesis 9′ can be gripped and securely held with the same forceps 1 without changing the arrangement of the projections 51, 52. The positioning precision is in this case guaranteed by the pin-like projections 51 which engage in the bores 97. [0033] If necessary, however, it is also possible to provide other jaw inserts 53′ which have a different arrangement of the projections 51′, 52′, as is shown in FIG. 4. In this way, the forceps 1 can be adapted to other intervertebral endoprostheses, for example to particularly small ones for treatment of children. [0034] With its abutment surface 62, the block 61 affords a sufficiently large force transmission surface for transmitting to the cervical prosthesis 9 the impulses applied to the bulge 76 acting as the strike head. The great advantage of this is that the projections 51, 52, which have been finely dimensioned in the interest of precise positioning, do not have to transmit the strike forces, so that the risk of bending or even breaking of the projections 51, 52 as a result of overloading is excluded, by virtue of the block 61 and its abutment surface 62 assuming the role of force transmission. [0035] The forceps 1 according to the invention allows the cervical prosthesis 9 to be arranged with precise positioning and without any risk of its being the wrong way round on the forceps 1, thereby preventing any undesired opening of the cervical prosthesis 9. Moreover, by virtue of the block 61 with the abutment surface 62, it also permits transmission of forces even in the case of forceps 1 of small dimensions. In this way, reliable implantation of the prosthesis is guaranteed. The small dimensioning of the forceps 1 also has the advantage that it gives the operating surgeon good access to and a good overall view of the implantation site. 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Classification606/99International ClassificationA61F2/30, A61F2/44, A61F2/46Cooperative ClassificationA61F2002/30616, A61F2002/4623, A61F2002/443, A61F2002/4628, A61F2/4611, A61F2002/4622, A61F2002/30904European ClassificationA61F2/46B7Legal EventsDateCodeEventDescriptionMar 26, 2004ASAssignmentOwner name: CERVITECH, INC., NEW JERSEYFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:KELLER, ARNOLD;REEL/FRAME:015142/0776Effective date: 20040116RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services