CN1193712C

CN1193712C - Pier bridge style screw system for vertebral arch pedicle

Info

Publication number: CN1193712C
Application number: CNB02157300XA
Authority: CN
Inventors: 毛广平; 赵建宁; 王与荣; 陈跃先; 黎介寿
Original assignee: Nanjing General Hospital of Nanjing Command PLA
Current assignee: Nanjing General Hospital of Nanjing Command PLA
Priority date: 2002-12-31
Filing date: 2002-12-31
Publication date: 2005-03-23
Anticipated expiration: 2022-12-31
Also published as: CN1424000A

Abstract

The present invention relates to an internal fixture for thefor hospital orthopaedic surgery. The present invention is composed of a plurality of orthopedic rods, a plurality of cross bridges and a plurality of vertebral arch pedicle screws, wherein each orthopedic rod is a cylindrical barred body, and each cross bridge is a flat square cylinder; each vertebral arch pedicle screw comprises a screw shank, the lower section shank body of the screw shank is provided with external threads, an expanding screw head of the upper end of the screw shank is provided with U-shaped deep grooves which are fit with the external diameter of the orthopedic rod, the two side walls of the expanding screw head corresponding to the U-shaped deep grooves are respectively provided with internal threads and external threads, and the two side walls of the expanding screw head are provided with shallow square grooves which are vertical with the direction of the U-shaped deep groove and are fit with the external shape of the cross bridge; the orthopedic rods are arranged in the U-shaped deep groove of the expanding screw head of the vertebral arch pedicle screw, are pressed against by a first internal core with external threads through the internal threads of the two side walls of the screw head, and are simultaneously pressed against by a first external sleeve with internal threads through the external threads of the two side walls of the screw head; the cross bridges are arranged in shallow square grooves of the two side walls of the expanding screw head, are positioned on the first internal core and the first external sleeve, and are pressed against by a second internal core with external threads and a second internal core with internal threads through the internal threads and the externals threads of the two side walls of the screw head, and the orthopedic rods and the cross bridges are simultaneously fixed to the expanding screw head of the same vertebral arch pedicle screw.

Description

Pier bridge-type pedicle screw system

Technical field

The present invention relates to a kind of pedicle internal fixation device of hospital orthopedics operation usefulness.

Background technology

At present, the pedicle internal fixation device of hospital orthopedics operation usefulness is existing many, but group, accessory are more mostly, processed complex, and consumptive material, consuming time costs an arm and a leg.Particularly horizontal connection is to link to each other with two orthopedic rods by a pair of relay part, and relay part producing cost, material and one piece of screw of time ratio are much higher between one piece.Horizontal connection is in order to adapt to the various different in width of two orthopedic excellent distances, and it is various to make specification, but real a few specification of having only commonly used, other specification can have again, so the idle parts of stock are more.Horizontal connection is not seen directly and pedicle screw connection person's report mutually at present.

Summary of the invention

Purpose of the present invention is exactly in order to address the above problem, and a kind of relay part that need not is provided, and makes the direct pier bridge-type pedicle screw system that connects mutually with pedicle screw of horizontal connection.

Technical solution of the present invention:

A kind of pier bridge-type pedicle screw system, it is made up of some orthopedic rods and cross-bridges and a plurality of pedicle screw, wherein orthopedic rod is cylindrical barred body, cross-bridges is flat square body, pedicle screw includes shank of screw, the hypomere body of rod of shank of screw is provided with external screw thread, its upper end is expanded head of screw and is had and the orthopedic rod outside diameter U moldeed depth groove that matches, and expand in the two side of corresponding U moldeed depth groove of head of screw is equipped with, external screw thread, it is characterized in that having on the two side of head of screw and U moldeed depth groove direction shallow square groove perpendicular and that match with the cross-bridges profile expanding, orthopedic rod places pedicle screw to expand in the U moldeed depth groove of head of screw, by pushing down by the female thread on the head of screw two side with externally threaded first inner core, push down by the external screw thread on the head of screw two side by tapped first overcoat again simultaneously, cross-bridges places and expands in the shallow square groove of two side of head of screw, it is positioned on first inner core and first overcoat, and also by with externally threaded second inner core and tapped second overcoat also respectively by on the head of screw two side, external screw thread is pushed down, and makes orthopedic rod and cross-bridges be fixed on expanding on the head of screw of same pedicle screw simultaneously.

Screw tail end of the present invention is an after-opening, orthopedic rod, horizontal connection by the rear be pressed into install in the groove very convenient, the horizontal connection of its initiative is directly installed on the pedicle screw that (screw is like bridge pier, horizontal connection likens bridge-Dun Qiao) to, and is better to the stability of screw than other horizontal connection that is positioned on the orthopedic rod theoretically.Orthopedic rod of the present invention is by two pieces of spiral shell cores, and two pieces of swivel nuts carry out the quadruple locking, and loosening rate is extremely low, and horizontal connection is by one piece of spiral shell core and one piece of swivel nut double locking, and is very firm.Orthopedic rod all has only a length with horizontal the connection, cuts off according to needs of patients length during use, has avoided the stock of all size preparation, saves unnecessary producing cost, reduces cost, and saves financial burden to the patient.Horizontal connection directly is connected with screw, has saved relay part between four that horizontal connection is connected with orthopedic rod, for the patient has saved a large sum of expense again.The present invention is simple in structure, assembly refine, easy for installation, function admirable, with low cost, multipotency multiple-effect, widely applicable, be convenient to penetration and promotion, its overall structure is very simple, is being the minimum internal fixation device of metallic structures that implants in the similar products at home and abroad at present.

Description of drawings

Fig. 1 is the decomposition texture sketch map of system of the present invention.

Fig. 2 is the local all directions sketch map of pedicle screw in the system of the present invention.

Fig. 3 is the overall structure sketch map of system of the present invention.

Fig. 4 is the vertical view of Fig. 3.

Fig. 5 is the side view of Fig. 3.

The specific embodiment

As Fig. 1,2, pier bridge-type pedicle screw system of the present invention, it by some orthopedic excellent 1 and cross-bridges 2 and a plurality of pedicle screw 3 form, wherein orthopedic excellent 1 is cylindrical barred body, cross-bridges 2 is flat square body, pedicle screw 3 includes shank of screw 4, the hypomere body of rod of shank of screw 4 is provided with external screw thread 5, its upper end is expanded head of screw 6 and is had and the orthopedic excellent 1 external diameter U moldeed depth groove 7 that matches, and expand in the two side of corresponding U moldeed depth groove 7 of head of screw 6 is equipped with, external screw thread 8,9, characteristics of the present invention are, have on the two side of head of screw 6 and U moldeed depth groove 7 directions shallow square groove 10 perpendicular and that match with cross-bridges 2 profiles expanding, orthopedic excellent 1 places pedicle screw to expand in the U moldeed depth groove 7 of head of screw 6, by pushing down by the female thread 8 on head of screw 6 two sides with externally threaded first inner core 11, push down by the external screw thread 9 on head of screw 6 two sides by tapped first overcoat 12 again simultaneously, cross-bridges 2 places and expands in the shallow square groove 10 of two side of head of screw 6, it is positioned on first inner core 11 and first overcoat 12, and also by with externally threaded second inner core 13 and tapped second overcoat 14 also respectively by on head of screw 6 two sides, external screw thread 8,9 push down, make orthopedic excellent 1 and cross-bridges 2 be fixed on expanding on the head of screw 6 of same pedicle screw 3 simultaneously, so the stablizing effect of this pedicle screw 3 is not nailing on stablizing effect and will get well with respect to cross-bridges 2, produce effect to preventing the loosening of screw and withdrawing from more, structure is simpler.

Among the present invention, the upper surface of first inner core 11 and second inner core 13 is provided with indent hexagonal hole 15, is convenient to operate with the specific purpose tool insertion of six square toes.The position of expanding above correspondence first overcoat 12 of head of screw 6 two sides at pedicle screw 3 is provided with open washer 16, the opening 17 of this packing ring 16 is consistent with shallow square groove 10 directions of head of screw 6 two sides, so that cross-bridges 2 is put into, the projection 18 in integral body inwardly is connected with respectively in the position of the corresponding head of screw 6 two side U moldeed depth grooves 7 of packing ring 16, and embedding is embedded in the U moldeed depth groove 7, it works to reinforce the two side of expanding head of screw 6 on the one hand, the thrust of second overcoat 14 is transmitted on first overcoat 12, further increase and compress orthopedic excellent 1 thrust, it is eliminated the gap between first overcoat 12 and second overcoat 14 again simultaneously, can prevent that first overcoat 12 is loosening.

When system of the present invention uses, according to patient's situation a plurality of pedicle screws 3 are screwed in patient's pedicle of vertebral arch, each pedicle screw 3 of same vertical row expands to be put in the U moldeed depth groove 7 of head of screw 6 orthopedic excellently 1, and pushes down by separately first inner core 11 and first overcoat 12.Simultaneously two vertical rows' two pedicle screws 3 on the same vertebra of being positioned at expand the shallow square groove 10 of head of screw 6 and put into cross-bridges 2, are pushed down by separately second inner core 13 and second overcoat 14, finish the internal fixation of patient's pedicle, as Fig. 3,4,5.

Claims

1, a kind of pier bridge-type pedicle screw system, it is made up of some orthopedic rods and cross-bridges and a plurality of pedicle screw, wherein orthopedic rod is cylindrical barred body, cross-bridges is flat square body, pedicle screw includes shank of screw, the hypomere body of rod of shank of screw is provided with external screw thread, its upper end is expanded head of screw and is had and the orthopedic rod outside diameter U moldeed depth groove that matches, and expand in the two side of corresponding U moldeed depth groove of head of screw is equipped with, external screw thread, it is characterized in that having on the two side of head of screw and U moldeed depth groove direction shallow square groove perpendicular and that match with the cross-bridges profile expanding, orthopedic rod places pedicle screw to expand in the U moldeed depth groove of head of screw, by pushing down by the female thread on the head of screw two side with externally threaded first inner core, push down by the external screw thread on the head of screw two side by tapped first overcoat again simultaneously, cross-bridges places and expands in the shallow square groove of two side of head of screw, it is positioned on first inner core and first overcoat, and also by with externally threaded second inner core and tapped second overcoat also respectively by on the head of screw two side, external screw thread is pushed down, and makes orthopedic rod and cross-bridges be fixed on expanding on the head of screw of same pedicle screw simultaneously.

2, pier bridge-type pedicle screw system according to claim 1 is characterized in that the upper surface of described first inner core and second inner core is provided with the indent hexagonal hole.

3, pier bridge-type pedicle screw system according to claim 1, it is characterized in that being provided with open washer in the position that pedicle screw expands above correspondence first overcoat of head of screw two side, the opening of this packing ring is consistent with the shallow square groove direction of head of screw two side, to put into cross-bridges, integral body inwardly is connected with interior projection respectively in the position of the corresponding head of screw two side of packing ring U moldeed depth groove, and embedding is embedded in the U moldeed depth groove.