DE102009001707A1 - Dorsal nail plate - Google Patents

Abstract

The present invention relates to a bone fixation plate (1) having a plate-like head portion (2) for engaging a broken bone portion having a plurality of apertures (11, 12) for receiving fixation means (13) and an intramedullary shaft portion (8) for placement in the bone in that the shaft area and the head area have at least at their end facing away from the head area a section curved along the longitudinal axis, and a corresponding operating set with such a fixing plate and a target device (15) for attaching anchoring screws.

Description

BACKGROUND OF THE INVENTION

FIELD OF THE INVENTION

The The present invention relates to a fixing plate for Bones with a plate-like head area for attachment to a bone broken bone area with multiple openings for recording of fixatives and an intramedullary shaft area for placement in bone, wherein shaft area and head area connected to each other are. The invention further relates to a corresponding operation set with a target device for arranging the fixation plate in the human body.

STATE OF THE ART

For the treatment of bone fractures, in particular in the area of the wrist, it is known to provide fixation plates which are temporarily arranged as an implant in the human body in the region of the bones in order to fix the bone fragments until they have healed again by mutually growing together. In this connection, it is also known, for example, to use dorsal nail plates for fractures in the area of the wrist, wherein corresponding dorsal nail plates according to the prior art have a T-shaped structure with a plate-shaped head area and a shaft area, as described for example in US Pat WO 03/020007 A2 is disclosed.

Out The prior art also discloses such dorsal nail plates or fixation plates in such a way that the shaft region, the formed as an elongated rod, in the bone marrow canal the spoke is placed while the head area is on the outside of the broken bone area arranged is to receive various fixatives, which are the fragments of Fix bone fracture. Between the outer head area, which is usually plate-shaped, and the intramedullary shaft, which is considered oblong Bar is formed, is an in side view S-shaped Connection area provided, which through an opening is guided in the bone, on the one hand, the outdoor area of the plate-shaped head area on the bone as well to allow intramedullary placement of the shaft in the bone.

at However, such an embodiment has the problem that only temporarily in the body implant difficult to remove on removal after healing of the fracture can be and remove it to bone area injuries comes in which the fixation plate is inserted into the bone so that after removing the fixation plate another longer healing process becomes necessary.

DISCLOSURE OF THE INVENTION

OBJECT OF THE INVENTION

It is therefore an object of the present invention, a fixing plate to provide that allows the fixation plate in a simple way to remove after the healing of the fracture. simultaneously However, the fixation plate should not be worse properties have as the known fixing plates and in particular a safe and stable positioning in or on the bone and fixation allow the bone fragments. About that In addition, the fixation plate should be simple and easy to manufacture be. In addition, it should be for the surgeon overall, so be easy to handle even when inserting.

TECHNICAL SOLUTION

These Task is solved by a fixing plate with the Features of claim 1 and an operation set with the features of claim 15. Advantageous embodiments are the subject of dependent claims.

The Invention is characterized in that the shank area not as in the prior art designed as a straight, elongated rod is, but at its, the head region averted end (free End) has at least one curved portion. By the curved section makes it possible the shaft upon removal of the fixation plate after healing of the fracture in a simple way from the bone marrow canal by unscrewing to remove.

Corresponding is the curved portion of the shaft portion along the longitudinal axis of the fixing plate curved, ie along the direction, ie in the direction of its longest extent or in the direction in which the shaft is in the intramedullary Channel of the bone is introduced.

Of the curved section can spread over the entire Shank area, ie over the entire longitudinal extension of the shaft area, extend or affect only parts thereof.

In addition, the curvature can be the same in particular with regard to the radius of curvature along the entire curvature section or for all curvature sections, or the curvature can occur within the curvature section or in different curvature sections, in particular with regard to the curvature radius be different.

Next the radius of curvature may also be the curvature in terms of the length of the curvature section differ in the different curvature sections. In particular, in the curvature sections also curvatures with different signs, so with respect to the direction of curvature. Corresponding can have concave and convex curvature sections alternate.

The Curvature sections can affect sections in the longitudinal extent of the intramedullary shaft area refer, d. H. that curved along the longitudinal axis or uncurved areas may be present.

About that However, it is also possible that the curvature sections refer to the top and bottom of the fixing plate and for example only the bottom, so the side facing away from the head area The shaft is curved while the top is not curved or other curvature sections having. In particular, the bends can the top and bottom also be different, for example in the In terms of radius of curvature, length and number of Curvature sections, etc.

To a simple embodiment, the shaft as a curved rod with constant radius of curvature be formed, wherein the curvature in particular at the the head area facing concave and at the head area opposite bottom can be convex.

Of the Intramedullary shaft can be replaced by a rod with any Be formed cross-section, such as square, rectangular, round, oval or polygonal cross-section.

Of the Rod can be one over its cross section Length consistent cross-section or to his be formed tapered free end, for example a further relief in the removal of the intramedullary Shafts from the bone marrow canal to allow.

At The shaft may have means for receiving fasteners be provided, such as continuous or baggy Threaded holes for accepting anchor bolts.

Of the curved shaft can be particularly in the connection area between the head area and intramedullary shaft of the Fixation plate can be arranged on the plate of the head area such that between the plate plane and a tangent to the intramedullary Shank forms an acute angle.

Of the plate-like head portion may have an extension which in Direction of the shaft area over the connection area protruding from the head area and shaft area and to the plant The bone wall serves to ensure a secure and firm attachment of the To allow fixation plate.

The Fixation plate can be used in particular as a dorsal nail plate for the dorsal fixation formed in wrist fractures be, wherein the fixing means for fixing the fragments, which are arranged on the fixing plate, not limited to nail but also screws, pins and other suitable fixatives and combinations thereof. However, the invention is not on the use of the fixation plate as a dorsal nail plate limited but includes use in all bone fractures, in which the fixing plate with the inventive Design can be used.

The Fixation plate can also be position and connection means for include a target device that allows a target device in a defined orientation stable and secure to connect with the fixing plate to the target device Anchoring means and / or fixative to bring.

The The invention thus also encompasses an operating set made from a device according to the invention Fixation plate and a corresponding target device.

BRIEF DESCRIPTION OF THE FIGURES

Further Advantages, characteristics and features of the present invention Based on the description of an embodiment with reference to attached drawings clearly. The drawings show here in a purely schematic way in

1 a side view of a fixing plate according to the invention with a target device arranged thereon;

2 a perspective view of the fixing plate with target device 1 ;

3 a side view of the fixing plate and the target device from the 1 and 2 when placed in or on a bone;

4 a side view of a sleeve and drilling assembly for the introduction of anchoring screws on the target device;

5 a plan view of a fixation plate on a bone partially shown;

6 a side view of a fixed in or on a bone fixation plate; and in

7 a representation of the angular distribution of the fixing screws.

Embodiment

1 shows a side view of an inventive surgical set from a fixation plate 1 for placement in a human body and a targeting device 15 which helps the surgeon the fixation plate 1 to arrange in or on a bone. The fixation plate 1 comprises a plate-like head area 2 and a curved shaft 8th acting as an intramedullary area of the fixation plate 1 in the bone marrow canal of a bone, while the plate-like head portion 2 rests on the outside in the region of a broken bone to the bone fragments located there via fixative 13 how to fix nails, pins or screws.

Accordingly, the head area 2 or the plate 6 of the head area 2 perforations 11 . 12 on where the fixatives 13 in the form of pins, nails, screws or the like. The breakthroughs 11 may be formed as a continuous threaded openings, for example, to receive screws therein, or as simple sleeves for receiving nails or the like. The breakthroughs 11 . 12 can in different orientations in the plate of the head area 2 be arranged to fix the fixative 13 to keep in certain orientations. The orientation can be through the opening 11 . 12 be fixed or the opening 11 . 12 may be configured to dictate some orientation, but the fixative 13 can be introduced, for example by a self-tapping thread in an at least certain extent in any orientation, so that the surgeon can enter into the individual circumstances when attaching the fixative.

In the plate-like head area 2 For example, a plurality of apertures may be provided to accommodate a plurality of fixation means 13 to allow, for example, a plurality of fragments to fix, or to hold a fragment safely through a plurality of differently oriented fixatives.

The fixatives 13 as used in the embodiment of 1 are shown, have a screw head with, for example, a hexagon socket or the like to the surgeon easy insertion and removal of the fixing means 13 to allow for example by screwing and unscrewing.

In addition to the fixing elements 13 that over the breakthroughs 11 and 12 in the plate 6 of the head area 2 can be included, rejects the plate 6 of the head area 2 also an aperture (not shown) through which a spiked wire 14 can be introduced into the fixation area of the bone, by means of the spiked wire 14 the orientation of the fixation plate 1 in or on the bone.

At the bottom of the plate 6 of the head area 2 is in the connection area 3 a curved shaft 8th arranged in the form of a curved rod which is placed intramedullary in the bone marrow canal of a bone.

The curved rod of the shaft area 8th is with a constant radius of curvature along its length along the longitudinal extent of the fixing plate 1 curved, ie the shaft 8th represents a part of a circle, wherein the axis of rotation about which the radius must be rotated to form the circle, perpendicular to the image plane of the side view 1 stands. The longitudinal extension of the fixing plate results in this case along the cutting edge of the image plane with the plate plane shown in dashed line representation 7 of the head area 2 , along the head area 2 extends. The longitudinal axis is thus through the shaft 8th and the sequential arrangement of head area 2 and shaft 8th given.

In the embodiment shown, the shaft is 8th both at the head area 2 facing top 10 as well as on the underside facing away from the head area 9 curved in the same way, so that a constant cross-section of the shaft 8th over the longitudinal extent results. At the top 10 the curvature is concave while at the bottom 9 the curvature is convex.

At the free end 4 of the shaft 8th the curved rod is nearly parallel to the plane of the plate 7 cut off.

In the connection area 3 is the shaft in the embodiment shown 8th dull with the plate of the head area 2 connected, ie the curved rod of the shaft 8th is without changing the radius of curvature directly to the plate-shaped head area 2 integrally connected. Alternatively, it is also possible that the shaft 8th in the connection area 3 one to the head area 2 adapted curvature and thus a changed curvature against Over the remaining sections of the sheep 8th has, for example, reverses its direction of curvature and sliding in the manner of an S-shape in the plate 6 the plate-shaped head area 2 flows (not shown). In both cases, however, takes a tangent 40 on the curved shaft portion of the connecting portion 3 with the plate level 7 the plate 6 of the head area 2 an acute angle α, ie an angle ≤ 90 °.

By the curvature of the shaft 8th For example, after healing of the fracture, the fixation plate can be easily removed from or out of the bone without the region in which the shaft is located 8th introduced into the bone, at the removal of the intramedullary shaft 8th to hurt. Also contributes to the acute-angled arrangement of the shaft 8th at the plate 6 of the head area 2 at.

The plate 6 of the head area 2 has an extension 5 on, extending over the connection area 3 out in the direction of the shaft 8th extends. The extension 5 with its underside for attachment to the bone, around the fixation plate 1 firmly and positionally stable in or on the bone to arrange.

The shaft 8th also has two threaded holes 21 and 22 on, which can be designed as blind holes or through holes. These threaded holes or openings 21 . 22 serve to receive anchoring screws that hold the stem 8th firmly connect with the surrounding bone, as shown in more detail in the following drawings.

The 1 also shows a target device 15 which is on the fixation plate 1 is arranged. This is indicated by the target device 15 Positioning and connecting means, such as the screw 16 from, in the 1 only the manual operation area can be seen. The screw 16 is through the main body 20 of the target device 15 passed through into a threaded hole of the plate 6 of the head area 2 the fixation plate 1 intervene. Correspondingly, with the screw 16 a strong connection between the target device 15 and the fixation plate 1 getting produced. In addition, between the main body 20 and the plate 6 Forming elements (not shown) may be arranged, the exact alignment and defined position of the body 20 to the plate 6 or the target device 15 to the fixing plate 1 enable.

At the base body 20 are in the area of the head area 2 two lateral guide plates 41 and 42 arranged, of which in the 1 only the guide plate 41 can be seen (see 2 ). The guide plates 41 . 42 spread over the plate 6 of the head area 2 laterally and thus represent corresponding form-fitting elements, the exact alignment of the target device 15 to the fixing plate 1 enable.

At the base body 20 are also two through holes 25 and 26 (dashed lines) provided with corresponding guide elements 18 . 19 cooperate to allow the operator via the passage openings 25 . 26 To introduce screws into the bone material in the threaded holes 21 . 22 in the shaft 8th intervention. In this way, after arrangement of the fixing plate 1 with the shaft 8th in the marrow canal attachment of the shaft 8th over the threaded hole 21 . 22 be carried out with the surrounding bone in a safe manner.

At the top of the main body 20 is a holding plate 17 arranged, which allows the surgeon the target device 15 to hold and guide.

Between the guide plates 41 and 42 created a clearance, the insertion and removal of a spiked wire 14 in the head area 2 the fixation plate 1 allows.

The target device 15 also has a main body 20 on which it allows the fixing elements 13 in the form of screws, pins, nails etc. in the plate 6 the fixation plate 1 to arrange. This is also particularly in the perspective view of 2 clearly visible. In addition, the shows 2 in a particularly good way the threaded holes 21 and 22 of shaft B.

The 3 shows the fixation plate 1 and the target device 15 in an arrangement at the place of use. The fixation plate 1 is here with the plate 6 on a bone area 28 arranged to be fixed in the fragments of a fracture with the fixing means not shown. The intramedullary shaft 8th is in the bone marrow canal 29 arranged. After the fixation plate 1 in this way on the bone 28 arranged and over a spiked wire 14 provisionally fixed or the correct position is determined by means of the screw 16 the target device 15 on the plate 6 or the fixing plate 1 arranged, with a threaded shaft of the screw 16 in a corresponding threaded hole 27 intervenes. By not shown positive locking elements is the target device 15 exact and stable in position to the fixation plate 1 aligned. Accordingly, it is possible via the passage openings 25 and 26 in the main body 20 of the target device 15 anchoring screws 23 and 24 Introduce through the bone wall 30 through into the threaded holes 21 and 22 of the shaft 8th be introduced. For this purpose, at the passage openings 25 and 26 of the basic body 20 guide elements 18 . 19 as they are in the 1 and 2 is are placed attached.

The guide elements 18 . 19 can according to the presentation of the 4 be formed, namely a first sleeve 31 have, the outer diameter of the diameter of the through holes 25 and 26 in the target device. The inner diameter of the first sleeve corresponds to the diameter of the screw head of the anchoring screws 23 and 24 ,

In the first sleeve 31 becomes a second sleeve 32 arranged, whose outer diameter corresponds to the inner diameter of the first sleeve and whose inner diameter corresponds to the thread diameter of the screw plus in addition has a tolerance range, for example in the order of 0.5 to 0.7 mm.

In the second sleeve 32 can be a sharp rod 33 be performed as a drilling or pushing element to a channel in the bone wall 30 It allows the anchoring screws 23 and 24 with her shaft through the bone wall 30 so that the threaded shaft of the anchoring screws 23 and 24 in the threaded holes 21 and 22 can be included. After the production of a corresponding channel, the second sleeve 32 from the first sleeve 31 remove to pass through the first sleeve 31 the anchoring screws 23 . 24 to be able to introduce.

Through the anchoring screws 23 . 24 is the fixation plate 1 firmly with the bone 28 or the bone wall 30 screwed and fixed in position stable. The fixatives 13 in the form of fixation screws, pins, nails or the like, before and / or after anchoring the fixation plate 1 on the bone wall 30 with the anchoring screws 23 and 24 into the bone material 28 are introduced to fix the fragments of a fracture.

The 5 and 6 show illustrations of the fixation plate 1 with the fixatives 13 in or on the bone 28 , In the plan view of 5 in which the intramedullary shaft is located 8th also shown as being visible, is in particular the different orientation of the fixative 1 in the bone 28 to recognize. In addition, the top view allows the recognition of the threaded hole 27 to connect the target device 15 with the fixing plate 1 as well as the opening 34 for arranging a spiked wire 14 ,

The 6 shows in a side view the anchoring of the fixing plate 1 with the anchoring screws 23 and 24 and the bone wall 30 and again the different orientation of the fixative 13 on the bone 28 ,

The shaft 8th is like in the 6 easy to recognize, in the bone marrow canal 29 arranged, being characterized by the curved shape of the shaft 8th the fixation plate 1 after healing the fracture, slightly off the bone 28 can be removed because after loosening the fixative 13 and the anchoring screws 23 . 24 the fixation plate 1 raised in a simple manner and the shaft 8th without major injury to the surrounding bone wall 30 from the bone marrow canal 29 can be turned out.

The 7 shows in a purely schematic representation of a possible angular distribution of the orientation of the fixing means 13 in the bone 28 , For example, the orientation of the fixative 13 in the bone 28 be chosen so that at least along a cutting plane in each case at a 18 ° angular distance a corresponding fixing means 13 in the bone 28 is anchored.

Even though the present invention with reference to the accompanying drawings described in detail with respect to an embodiment is obvious to a person skilled in the art, that the invention is not limited to this embodiment is limited, but rather that modifications or changes, for example, in terms of omission of individual features or different combinations of the features presented possible are without the scope of the appended claims to leave. The present invention includes in particular all possible combinations of all presented individual features.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• WO 03/020007 A2 [0002]

Claims (15)

Bone fixation plate with a plate-like head portion ( 2 ) for engaging a broken bone area with multiple openings ( 11 . 12 ) for receiving fixatives ( 13 ) and an intramedullary shaft region ( 8th ) for placement in the bone, whereby shaft region and head region are connected to one another, characterized in that the shaft region ( 8th ) at least at its end facing away from the head region ( 4 ) has a curved along the longitudinal axis portion. Fixing plate according to claim 1, characterized in that the shaft region ( 8th ) is curved along the entire longitudinal extent. Fixation plate according to one of the preceding claims, characterized in that the curvature with regard to the radius of curvature along the entire curvature section the same or different. Fixation plate according to one of the preceding claims, characterized in that one or more curved sections with the same or different radii of curvature and / or section lengths are arranged. Fixing plate according to one of the preceding claims, characterized in that the shank region on its underside facing away from the head region ( 9 ) is curved. Fixation plate according to one of the preceding claims, characterized in that the shank region on its top side facing the head region ( 10 ) is curved. Fixation plate according to one of the preceding claims, characterized in that the curvature of lower and Top of the shaft portion with respect to the radius of curvature and / or Length and / or number of curvature sections the same or different. Fixation plate according to one of the preceding claims, characterized in that the curvature at the head region facing top ( 10 ) of the shank region concave and on the underside facing away from the head region ( 9 ) of the shaft portion is convex. Fixation plate according to one of the preceding claims, characterized in that the shaft region ( 8th ) is formed by a rod with a square, rectangular, round, oval or polygonal cross-section. Fixation plate according to one of the preceding claims, characterized in that the shaft region ( 8th ) is formed by a rod with over its longitudinal extension constant cross-section or tapered to its free end cross-sectional dimensions. Fixation plate according to one of the preceding claims, characterized in that in the shaft region ( 8th ) Medium ( 21 . 22 ) are provided for receiving fasteners. Fixing plate according to one of the preceding claims, characterized in that the plate-like head region ( 2 ) a disk plane ( 7 ), along which the head area ( 2 ) extends in its greatest extent, and the shaft region ( 8th ) in the connection area ( 3 ) to the head portion has a curvature portion whose tangent with the plane of the plate forms an acute angle (α). Fixation plate according to one of the preceding claims, characterized in that the head region ( 2 ) an extension ( 5 ), which in the direction of the shaft region ( 8th ) over the connection area ( 3 ) of header area ( 2 ) and shaft area ( 8th ) protrudes and serves to rest against the bone. Fixation plate according to one of the preceding claims, characterized in that positional and connecting means ( 27 . 41 . 42 ) for a target device ( 15 ) are arranged. Operation set from a fixation plate ( 1 ) according to one of the preceding claims and a target device ( 15 ) for the positionally accurate arrangement of fixing agents.