AT524170A1 - Plate for plating, fastener and set - Google Patents

Abstract

Plate (1) for plate osteosynthesis, a first retaining pin opening (9) and a first retaining pin recess (10) protruding from a bore (8). Furthermore, a fastening element (20) for fastening the plate (1) to a bone part, comprising: a head element (21) which is connected to an expansion sleeve (22) via a connecting section (23), a wedge element (24) and a pull rod ( 26), a first retaining pin (27) protruding from the connecting section (23) for insertion into the first retaining pin recess (10). Furthermore, a set (60) for plate osteosynthesis with a plate (1) and at least one fastening element (20).

Description

The invention relates to a plate for plate osteosynthesis, with a plate top, a plate bottom and at least one first connection device with a first connection opening and a second connection device with a

second connection opening.

Furthermore, the invention relates to a fastening element for fastening a plate with a bone part for plate osteosynthesis, having:

- a header;

- an expansion sleeve which is connected to the head element via a connecting section, the outer surfaces of the connecting section and the expanding sleeve lying on a surface of revolution;

- A wedge element, which has an increasing cross-section in an axial direction in a conical section, wherein the expansion sleeve is at least partially pushed onto the wedge element and can be spread open by displacement relative to the wedge element from the conical section; and

- A pull rod with which the wedge element relative to

Expansion sleeve can be moved.

The invention also relates to a set for plate osteosynthesis.

In plate osteosynthesis, bone fractures (particularly in the shaft area of a long tubular bone) are stabilized with a plate. The plate has drilled holes for this purpose, through which screws are inserted into the bone on both sides of the fracture. However, these systems only achieve poor power transmission and low angular stability between the plate and the screws, since the screws are only guided through the small thickness of the plate and the respective screw head limits movement of the plate in only one axial direction (the respective screw) is present. It is therefore necessary that the plate is pressed against the bone by tightening the screws and the plate is thus

mechanical bone and screw head is fixed.

Angle-stable plate systems are also known, such as

shown for example in US 2014/0277180 A1. disadvantageously

these systems also only work with screws.

As a result, these plates cannot be used stably with screws, but rather with fasteners that are not screwed into the bone using a thread. However, there is the disadvantage with screws that the screw thread causes a Schwab effect on the bone, which is why the screws can (especially in the presence of osteoporosis) 165sen. Screws also create predetermined breaking points in the bone due to their thread and its cutting effect, where the bone can easily break. In addition, removal from a plate secured with screws is also difficult and the screws may break off during removal. However, removal is often necessary, since a permanent dismissal

Bone resorption can begin.

It is an object of the invention to overcome one or more of the disadvantages of the prior art. In particular, it is an object of the invention to propose a plate and a fastening element which enable a more stable connection to one another and to a bone. A plate for plate osteosynthesis, a fastening element for fastening a plate with a bone part for plate osteosynthesis and a set for plate osteosynthesis that are easier to attach, achieve improved stability in the bone and/or have a lower risk of damage to the bone are preferably proposed. A subsequent removal is also preferred

tion simplified from the bone.

This is achieved by a plate as mentioned in the opening paragraph, wherein the first connection opening is formed

- through a bore extending from the upper side of the plate to the lower side of the plate for the passage of a substantially rotationally symmetrical body of a fastening element for fastening in a bone part,

- By at least one extending from the top side of the plate and extending radially outwards from the bore along a peripheral section, the first retaining pin opening for inserting one of the essentially rotationally symmetrical

Body of the fastener protruding first retaining pin

- by at least one first retaining pin recess between the upper side of the plate and the lower side of the plate, which extends radially outwards from the bore along a peripheral section, which is adjacent to the first retaining pin opening in the peripheral direction and into which a guided into the first retaining pin opening first retaining pin of the fastening element can be at least partially inserted by rotating about an axis of the essentially rotationally symmetrical body, wherein the first connecting device has at least one first retaining pin contact surface, which the first retaining pin recess in

Limited towards the top of the plate.

The essentially rotationally symmetrical body of the fastening element is guided through the hole in the plate (from the direction of the upper side of the plate in the direction of the lower side of the plate). The first retaining pin protruding from the essentially rotationally symmetrical body is guided through the first retaining pin opening. The fastener can then be rotated to insert the first retaining pin into the first retaining pin recess. There the first retaining pin (in the direction of the top of the plate) lies against the first retaining pin contact surface. This blocks the fastening element from tilting in the bore in this direction, which improves the stability of the connection. Furthermore, the plate is thus fixed in the direction of the bone, since the plate rests against the first retaining pin with the first retaining pin contact surface. Thus, the plate is also suitable for use with non-helical fasteners. A bayonet lock is preferably used between

achieved plate and fastener.

The first connecting device is set up in particular to connect the plate to a bone via a first fastening element and the second connecting device is set up in particular to connect the plate to a bone via a second fastening element. The hole breaks through the top and bottom of the plate. The plate top is in particular the upper plate surface (i.e. the plate surface which is intended to be away from the bone

to be nimble). The underside of the panel is in particular the

posterior plate surface (i.e. the plate surface intended to face the bone). The bore preferably has a radius and/or a large extent in the radial direction from a center point of the bore, which is between 1 mm and 20 mm, in particular between 2 mm and 10 mm. The top of the plate is preferably at least partially parallel to the bottom of the plate. The bore is preferably circular. The bore preferably has a cross-section that remains the same over its depth in the plate. The direction in which the borehole extends in the plate is also referred to below for short as the direction of extention of the borehole and runs along a center line through the borehole. The bore preferably extends orthogonally to the upper side of the plate and/or to the lower side of the plate. However, it is also possible to run at an incline to the upper side and/or the lower side of the panel. The center of the hole is understood to be the centroid of the area of the hole (at a certain depth in the plate).

the.

In particular, the first retaining pin opening breaks through the upper side of the plate. The first retaining pin opening connects to a perimeter of the bore. Thus, the first retaining pin, which protrudes from the essentially rotationally symmetrical body, can be inserted into the first retaining pin opening (when inserting the rotationally symmetrical body into the bore). In this case, usually only the rotationally symmetrical body is introduced first, only in the course of the sliding of the rotationally symmetrical body in the bore is the first retaining pin also inserted into the first retaining pin opening at a point in time. The bore and the first retaining pin opening are in particular directly connected to one another. The first retaining pin opening extends from the bore in the radial direction by preferably at least 0.03 times, more preferably at least 0.1 times, even more preferably at least 0.15 times the radius of the bore (and/or the greatest extent of the borehole in the radial direction from a center point of the borehole). The first retaining pin opening preferably has a constant transverse

cut in the direction of extension of the bore.

Since the first retaining pin recess in the direction of the top of the

side is delimited by the first retaining pin contact surface, the first retaining pin recess in particular does not extend to the top of the plate. The first holding pin recess adjoins the bore, in particular at a peripheral section of the bore. Furthermore, the bore adjoins a section of the retaining pin opening, in particular in a circumferential direction (relative to the circumferential direction of the bore). Preferably, the first retaining pin can be fully inserted into the first retaining pin recess. The first retaining pin contact surface is preferably essentially parallel to the top side of the panel and/or to the underside of the panel. The retaining pin contact surface is preferably flat, at least in sections. In particular, the first retaining pin recess is directly connected to the first retaining pin opening and the bore. The first retaining pin recess extends from the bore in the radial direction by preferably at least 0.03 times, more preferably at least 0.1 times, even more preferably at least 0.15 times the radius of the bore (and /or the greatest extension of the bore in the radial direction from a center point

the bore).

The first connection opening may also have a first additional trunnion opening between the plate top and the plate bottom, which extends radially outward from the bore along a circumferential portion which is circumferentially contiguous with the first trunnion opening (while extending in the opposite circumferential direction adjoining the first retaining pin opening like the first retaining pin recess) and into which a first retaining pin of the fastening element guided into the first retaining pin opening can be at least partially inserted by rotating about an axis of the essentially rotationally symmetrical body, the first connecting device having at least one first additional retaining pin contact surface, which delimits the first additional retaining pin recess in the direction of the top side of the plate. Thus, a fastener inserted into the bore can be rotated in both directions and the first retaining pin can be inserted either into the first retaining pin recess or into the first additional retaining pin recess.

The associated with the first retaining pin recess and /

or the first retaining pin contact surface can (also or only) in the first additional retaining pin recess or the first additional retaining pin

Abutment surface can be provided.

The plate can be of any shape. The plate is preferably rounded off on the upper side of the plate and/or on the lower side of the plate towards the edges of the upper side of the plate or the lower side of the plate. A longitudinal extension of the plate is preferably at least twice as large, particularly preferably at least 3 times, even more preferably at least 4 times, as large as a width extension of the plate. The plate has a length (in the direction of length and at the longest point) of preferably between 2 cm and 50 cm, particularly preferably between 5 cm and 30 cm. The plate has a width extent (in the direction of width extent and at the widest point)) of preferably between 2 mm and 8 cm, particularly preferably between 5 mm and 4 cm. The plate has a thickness (orthogonal to the longitudinal direction and orthogonal to the width direction of the plate and at the thickest point) of preferably between 1 mm and 20 mm, particularly preferably between 2 mm and 10 mm. The plate is preferably substantially rectangular in cross-section orthogonal to the depth (i.e., thickness) extension direction. Preferably, the plate has at its ends in the direction of longitudinal extent decreasing

de latitudes.

It is preferred if the first connecting device has at least one first stop element, which delimits the first retaining pin recess in a circumferential direction of the bore, so that rotation of the fastening element can be blocked by the first retaining pin striking the first stop element. The first stop element can serve as an indicator (by the first retaining pin striking the first stop element) that the first retaining pin has been fully inserted into the retaining pin recess. Furthermore, the stability of the connection between the plate and the fastening element is improved in the circumferential direction. When the fastener is loosened by applying torque to an element of the fastener

movement element (particularly a pull rod) in the bone

is to be spread, the first stop element can also cause the element to be rotated relative to the rest of the fastening element, so that the spreading is effected and not the fastening element itself (further) is rotated. The first stop element preferably protrudes from the first holding pin contact surface in the direction of the underside of the plate. The first stop element is preferably provided on the side of the first retaining pin recess that faces away from the first retaining pin opening. The first retaining pin can be inserted from the first retaining pin opening into the first retaining pin recess by rotating the fastening element, with the first stop element then blocking further rotation of the fastening element. The first stop element preferably runs at least partially essentially parallel to the extension

direction of the hole.

It is advantageous if the first retaining pin opening of the first connection opening extends to the underside of the panel. The first retaining pin opening preferably breaks through the underside of the plate. Alternatively, the first retaining pin opening

also be delimited to the underside of the plate.

It is preferred if the first retaining pin opening and the first retaining pin recess (in particular at least along a peripheral section) have the same extension in the radial direction in relation to a center point of the bore. Thus, the insertion of the first trunnion from the first trunnion hole into the first trunnion hole and the stability are improved. Preferably, the retaining pin recess is substantially in the shape of a partial circle or substantially in the shape of an annulus (i.e. the intersection of an annulus and a sector of a circle) (orthogonal in cross-section

to the direction of extension of the bore) is formed.

It is advantageous if the first connection opening on the top side of the panel has a head recess for receiving a head element of the fastening element, which head recess is delimited by a head contact surface (in particular in the direction of the underside of the panel). That is, it is preferable if

the first connection opening extends from the plate top

extending head depression (breaking through the disk top). Thus, with the fastening element or with a head element of the fastening element, a pull can be exerted on the plate in the direction of the underside of the plate or in the direction of the bone by resting on the head contact surface. The plate is thus advantageously held in the direction in which the thickness extends between the head element of the fastening element and the first retaining pin of the fastening element. The head element can also be used to better block tilting of the plate relative to a fastening element. Furthermore, if the head element is in contact with the radial outer surfaces of the head depression, this counteracts tilting. The head abutment surface is preferably closer to the disk top than the spigot abutment surface. The Head Depression

preferably protrudes from the bore in the radial direction.

It is preferred if the head depression is formed by an annular recess starting from the top side of the disk, the center point of which coincides with the center point of the bore and the diameter of which is larger than the diameter of the bore. The head indentation is preferably connected directly to the bore. The head depression and the first retaining

fen recess may coincide in places.

It is advantageous if the first connection opening is further formed

- through a second retaining pin opening extending from the upper side of the plate and extending radially outwards from the bore along a circumferential section for inserting a second retaining pin protruding from the essentially rotationally symmetrical body of the fastening element, the second retaining pin opening extending from the bore in extends in a different radial direction than the first retaining pin opening, and

- By at least one second retaining pin recess between the plate top and the plate underside, which extends radially outwards from the bore along a peripheral portion, which is adjacent to the second retaining pin opening in the circumferential direction and into which a second

Retaining pin opening guided second retaining pin of the fastening

ment element can be at least partially introduced by rotation about an axis of the substantially rotationally symmetrical body, the first connecting device having a second holding pin contact surface which delimits the second holding pin recess in the direction of the top side of the plate. The tilting stability of the connection between the fastening element and the plate can thus be further improved. The features described in connection with the first retaining pin opening and/or the first retaining pin recess can also be provided in the second retaining pin opening or retaining pin recess. The bore and the second retaining pin opening are in particular directly connected to one another. Preferably, the second trunnion recess extends from the second trunnion aperture in the same direction (i.e., orientation) of the circumferential direction as the first trunnion recess extends from the first trunnion aperture. The second retaining pin opening is preferably from the first

th retaining pin opening spaced.

It is preferred if the first connecting device has at least one second stop element, which delimits the second retaining pin recess in a circumferential direction of the bore, so that rotation of the fastening element is blocked by the second retaining pin striking the second stop element. The preferred features described in connection with the first stop element can (also or only)

be provided at the second stop element.

The features described in connection with the first connection device can (also or only) be provided in connection with the second connection device. It is preferred if the second connection device is configured identically to the first connection device. Fastening to a first bone part is preferably achieved via the first connecting device and fastening to a second bone part, which is separated from the first bone part by a fracture, via the second connecting device. Thus, with both bone parts a tilt-stable connection with the

plate can be reached.

It is advantageous if the first connecting device and

the second connection device in the longitudinal direction

of the plate are spaced apart.

It is preferred if the plate has a bioresorbable material, in particular magnesium, preferably a magnesium alloy. A bioresorbable (also called biodegradable or bioabsorbable) material is understood to mean a material that over a period of time in a physiological environment, in particular in the human and/or animal body, at least 90% by weight, preferably essentially completely, by biological, chemical and/or physical processes are degraded (dissolved, decomposed, fissioned and/or eroded). Degradation of the bioresorbable material may include and/or be followed by removal, restructuring, assimilation, and/or excretion of the degraded material, among other things. For example, the bioresorbable material can be a material that is at least partially, preferably essentially completely, replaced by bone and/or bone marrow during and/or after bioresorption. The replacement with bone and/or bone marrow may involve the macroscopic, microscopic and/or atomic restructuring of the bioresorbable material in situ and/or its removal. The bioresorbable material is preferably broken down into components that are metabolizable and/or excretable. The bioresorbable material is preferably within a period of less than 10 years, more preferably within a period of less than 5 years, even more preferably within a period of 2.5 years, to at least 90% by weight, preferably essentially completely, im adult human body degraded. The bioresorbable material is preferably a bioresorbable metal, a bioresorbable metal alloy, a bioresorbable polymer and/or a bioresorbable composite material. The bioresorbable material is preferably based on magnesium and/or iron. The bioresorbable material can have, for example, poly-L-lactide (PLLA), poly-D-lactide (PDLA) or poly-(L-co-D/L-lactide) (PLDLLA). The bioresorbable material can have one or more bioresorbable substances. The plate preferably consists of at least 20% by weight, particularly preferably at least

at least 50% by weight, more preferably at least 90% by weight

the bioresorbable material. Preferably, the bioresorbable material has a magnesium alloy according to one of the in AT

510087 Al described embodiments.

The plate preferably has titanium, in particular a titanium alloy

greed, on.

The above-mentioned object is also achieved according to the invention by a fastening element for fastening a plate with a bone part for plate osteosynthesis as described at the outset, wherein at least a first

Retaining pin protrudes radially outwards.

With the first holding pin, a force can be exerted on the plate from below (i.e. from the direction of the bone and in the direction of the upper side of the plate), thus stabilizing it better. The advantages described in connection with the plate also apply to the fastening element. The features of the fastening element described in connection with the panel can generally also be used with the fastening element

be provided.

The fastening element is inserted through the plate, in particular through the first connection opening, and then into a preferably pre-drilled drill hole in a bone part. In particular, the expansion sleeve, the wedge element and the tie rod are guided at least partially through the bore, whereas the first retaining pin is guided at least partially through the first retaining pin opening. The fastener is rotated to drive the first trunnion from the first trunnion opening into the first trunnion recess. There the first retaining pin rests against the first retaining pin contact surface in the direction of the upper side of the plate. The wedge element is then displaced relative to the expansion sleeve with the pull rod, the expansion sleeve being pushed (further) onto the conical section of the wedge element and thus expanded. Thus, the fastener in the bone

braced or wedged.

Since the fastener is inserted into a drilled hole,

incorrect (e.g. too deep) insertion in the bone is excluded. This is not possible with a screw, since it has to be screwed in at least partially in order to find a hold in the drilled hole. Furthermore, the expansion sleeve exerts a flat pressure on the surrounding bone tissue. The formation of predetermined breaking points due to the screw thread, which occurs when a screw is used, can thus be avoided. In addition, the removal of the fastening element and thus the screw is also simplified, since the wedge element can be displaced in the opposite direction relative to the expansion sleeve with the pull rod and the expansion can thus be released. Then the fastener can easily

be pulled out of the borehole.

The first retaining pin is thus arranged essentially between the expansion sleeve and the head element. The first retaining pin is in particular in the form of a bulge in the connecting section. The head element can be a screw head. In particular, the head element has a greater radial extent than the connecting section or the expansion sleeve (in the non-expanded state). The first retaining pin extends from the connecting section in the radial direction by preferably at least 0.03 times, more preferably at least 0.1 times, even more preferably at least 0.15 times the radius of the connecting section (and/or the greatest extent of the connecting portion in a radial direction from a midpoint of the connecting portion). The first retaining pin preferably extends at least 0.2 mm, in particular at least 0.5 mm, out of the connecting section. The first retaining pin opening and/or the first retaining pin recess preferably has/have an extension in the radial direction (from a center point of the bore) that is at least equal to or greater than that of the first retaining pin (from a center point of the connecting section). The connecting portion is preferably circular in cross section normal to the longitudinal direction (i.e., axial direction) of the fastener. The connecting section is preferably rigidly connected to the expansion sleeve and/or the head element. The connecting portion is preferably integral with the

Expansion sleeve and / or the head element formed.

The fact that the outer surface of the connecting section lies on a surface of revolution means that the outer surface, with the exception of the first retaining pin and any further retaining pins, is on a

ner surface of revolution.

The expansion sleeve is preferably an expanding sleeve. The expansion sleeve has in particular a sleeve jacket. The expansion sleeve can have other elements in addition to the sleeve jacket. The expansion sleeve and/or the sleeve jacket is/are preferably essentially in the form of a cylinder jacket surface or a truncated cone jacket surface. The wedge element is preferably in the shape of a truncated cone or the surface of a truncated cone in the conical section. In the conical section, the wedge element preferably has a cross section that increases in an axial direction. The cross section of the wedge element in the conical section preferably increases by at least 2%, preferably by at least 5%, even more preferably by at least 10% (related to the smallest cross section and in particular measured as a radius). The diameter of the wedge element in the conical section preferably increases by at least 0.5 mm, particularly preferably by at least 1 mm, from the smallest to the largest diameter. In the conical section, the lateral surface of the wedge element preferably has an angle (i.e. half a cone angle) of preferably 1°, particularly preferably 2°, even more preferably 5°. The wedge element preferably has a cylindrical section (with a substantially cylindrical lateral surface) adjoining the conical section in an axial direction. Preferably the fastener has a length of between 10 and 70mm and a diameter of between 2 and 8mm. The wedge element and the expansion sleeve in the expanded and/or released state preferably have an (outer) diameter of between 1 mm and 40 mm, particularly preferably of between 2 mm and 20 mm. The wedge element and the expansion sleeve preferably have an overall length (in the axial direction) of between 5 mm and 200 mm in the expanded and/or released state, particularly preferably of

between 8mm and 100mm.

The expansion sleeve is in particular in the direction of increasing cross section (at least partially) on the wedge element

sliding. The drawbar is preferably at least partial

radially inside the expansion sleeve and/or the wedge element. The wedge element is in particular in an axial direction, preferably in both opposite axial directions, relative to the

Expanding sleeve moveable.

It is advantageous if the wedge element and the tie rod have connecting devices that work together, with which (or so that) the wedge element can be displaced relative to the expansion sleeve. Preferably, with the cooperating connecting means, the wedge element is slidable in both directions (i.e. the opposite directions) relative to the expansion sleeve. Preferably, the interacting connecting means are configured to convert rotation of the pull rod relative to the wedge member into relative displacement of the wedge member

to convert to an expansion sleeve.

It is preferred if, as the interacting connecting devices, the wedge element has a first thread and the pull rod has a second thread complementary to the first thread. Thus, a displacement of the wedge element in a simple manner

be effected relative to the pull rod or to the expansion sleeve.

It is advantageous if the first thread is formed as an internal thread (i.e. nut thread) and the second thread is formed as an external thread (i.e. screw thread). The pull rod is preferably attached at least partially radially inside the wedge element.

orderly.

It is advantageous if the wedge element has at least one radially protruding anti-rotation projection, in particular extending in the axial direction, which engages in an incision (in particular running in an axial direction) in the expansion sleeve. This can prevent the wedge element from being twisted when a torque is exerted on the tie rod, and thus ensure that the torque or the

Rotation of the drawbar translates into displacement of the wedge element

is converted into an expansion sleeve.

It is preferred if the wedge element and the tie rod are rigid

are connected or can be connected to each other, in particular

are formed in one piece. In this way, the number of separate parts can be reduced and thus manufacture can be simplified. Furthermore, the stability of the implant is thus improved. Thus, a displacement of the pull rod relative to the expansion sleeve directly causes a (same)

Displacement of the wedge element relative to the expansion sleeve.

It is advantageous if the wedge element and/or the tie rod on the one hand and the expansion sleeve, the connecting section and/or the head element on the other hand have interacting connecting devices with which the wedge element and the tie rod can be displaced relative to the expansion sleeve. Preferably, the cooperating connecting means are configured to convert rotation of the tie rod and wedge member relative to the expansion sleeve into displacement of the wedge member and tie rod relative to the expansion sleeve. The cooperating connection means are preferably cooperating threads. In particular, the expansion sleeve preferably has an internal thread and the wedge element and/or the

Pull rod on an external thread.

It is advantageous if the pull rod is at least partially guided through the expansion sleeve. Preferably, an inner surface of the expansion sleeve is at least partially on an outer

surface of the drawbar.

It is preferred if the head element, the connecting section and/or the expansion sleeve on the one hand and the pull rod on the other hand each have a stop element which blocks displacement of the pull rod relative to the expansion sleeve in at least one axial direction, with the direction preferably being in the direction of an increasing cross section of the Wedge element shows in the conical section. It can thus be ensured that the tie rod causes a displacement of the wedge element (and not the tie rod itself), in particular that a rotation of the tie rod results in a displacement of the wedge element (and

not the drawbar itself).

It is advantageous if the head element has a larger radial

extension than the connection section and the head

element forms a bearing surface adjacent to the connecting section and facing the expansion sleeve. The head element can be inserted into the head cavity. The bearing surface then abuts and preferably exerts a force on the head abutment surface to stabilize the disk between the first support post and the head. The head recess preferably has at least the same or greater radial extent (in particular an at least equal

large or larger radius) than the head element.

It is advantageous if the pull rod has a first screw head drive element, in particular in the form of an internal screw head profile, at one end. With this, a torque can be exerted on the pull rod at one end of the pull rod in order to move the wedge element relative to the expansion sleeve and to spread open the expansion sleeve. The first screw head

drive element has, for example, a hexagon socket profile.

It is advantageous if the head element has a second screw head drive element, for example in the form of an external screw head profile. Torque can be exerted on the expansion sleeve with the second screw head drive element. In particular, the expansion sleeve can be prevented from rotating with the aid of the second screw head driving element while the pull rod is being rotated with the second screw head driving element. The second screw head drive element has, for example, an external hexagonal profile (comparable to an Allen key). The second screw head profile can also be in the form of at least two recesses

ments are present at the top of the head element.

It is advantageous if the expansion sleeve has at least two incisions running from an edge of the expansion sleeve that delimits the expansion sleeve in an axial direction and faces away from the head element. In particular, wings are formed between the incisions. The wings can be spread open when pushed onto the wedge element. This simplifies the expansion of the expansion sleeve (even when using a very stiff material for the expansion sleeve). The incisions are

preferably provided by the edge of the expansion sleeve that the

Expansion sleeve limited in that axial direction in which the transverse

section of the wedge element is increasing in the conical section.

It is advantageous if the expansion sleeve has grooves and/or ribs running in the circumferential direction on its outer lateral surface. With these, the stability of the attachment of the implant to the first bone part can be improved in the axial direction. In particular, a low form fit can thus also be achieved. The compression with the bone is improved by the grooves and/or ribs. The grooves and/or

Ribs preferably run (full) circumferentially.

It is preferred if the expansion sleeve has grooves and/or ribs running obliquely to the circumferential direction, in particular running axially, on its outer lateral surface. Thus, a twisting of the expansion sleeve and thus the implant relative to

bones are prevented.

It is advantageous if the grooves and/or ribs running in the circumferential direction and/or the grooves and/or ribs running obliquely to the circumferential direction have a height difference of less than 2 mm, preferably less than 1 mm, particularly preferably less than 0.5 mm are trained. The grooves and/or ribs running in the circumferential direction are formed by a height difference of preferably less than 2 mm, more preferably less than 1 mm, even more preferably less than 0.5 mm or less than 0.3 mm and/or preferably more formed as 0.05 mm. The grooves and/or ribs running obliquely to the circumferential direction are formed and/or preferred by a height difference of preferably less than 2 mm, particularly preferably less than 1 mm, even more preferably less than 0.5 mm or less than 0.3 mm formed more than 0.05 mm. With these values, it is particularly advantageous to

the fact that break-off edges/predetermined breaking points occur in the bone.

It is preferred if the outer lateral surface of the wedge element is essentially cylindrical in an end section of the wedge element remote from the head element and if the outer lateral surface of the expansion sleeve is essentially cylindrical in an end section remote from the head element

End portion of the expansion sleeve is essentially cylindrical.

This simplifies the (partial) insertion of the implant into an implant provided in the bone. A maximum outer circumference of the expansion sleeve in the non-expanded state preferably corresponds to less than 1.2 times, in particular less than 1.1 times, the maximum outer circumference of the wedge

elements.

It is advantageous if a second retaining pin protrudes radially outwards from the connecting section in a different direction than the first retaining pin, which second retaining pin is preferably arranged opposite the first retaining pin. The preferred embodiments described in connection with the first retaining pin can be provided for the second retaining pin. Preferably, the first retaining pin and the second

Retaining pin formed in the same way.

The expansion sleeve, the wedge element, the head element and/or the pull rod and/or the fastening element preferably has/have titanium. The expansion sleeve, the wedge element, the head element and/or the tie rod and/or the fastening element consists/consist of preferably at least 50% by weight, particularly preferably at least 90% by weight, even more preferably essentially

fully made of titanium.

It is preferred if the fastening element has a bioresorbable material, in particular magnesium. The expansion sleeve, the wedge element, the head element and/or the pull rod and/or the fastening element preferably has/have a bioresorbable material. A bioresorbable (also called biodegradable or bioabsorbable) material is understood to mean a material that over a period of time in a physiological environment, in particular in the human and/or animal body, at least 90% by weight, preferably essentially completely, by biological, chemical and/or physical processes are degraded (dissolved, decomposed, fissioned and/or eroded). Degradation of the bioresorbable material may include and/or be followed by removal, restructuring, assimilation, and/or excretion of the degraded material, among other things. For example, the bioresor-

be a material that can be used during and/or after

the bioresorption is at least partially, preferably essentially completely, replaced by bone and/or bone marrow. The replacement with bone and/or bone marrow may involve the macroscopic, microscopic and/or atomic restructuring of the bioresorbable material in situ and/or its removal. The bioresorbable material is preferably broken down into components that are metabolizable and/or excretable. The bioresorbable material is preferably within a period of less than 10 years, more preferably within a period of less than 5 years, even more preferably within a period of 2.5 years, to at least 90% by weight, preferably essentially completely, im adult human body degraded. The bioresorbable material is preferably a bioresorbable metal, a bioresorbable metal alloy, a bioresorbable polymer and/or a bioresorbable composite material. The bioresorbable material is preferably based on magnesium and/or iron. The bioresorbable material can have, for example, poly-L-lactide (PLLA), poly-D-lactide (PDLA) or poly-(L-co-D/L-lactide) (PLDLLA). The bioresorbable material can have one or more bioresorbable substances. The expansion sleeve, the wedge element, the head element and/or the pull rod preferably consist of at least 20% by weight, particularly preferably at least 50% by weight, even more preferably at least 90% by weight, of the bioresorbable material. The fastening element preferably consists overall of at least 20% by weight, particularly preferably at least 50% by weight, even more preferably at least 90% by weight, of the bioresorbable material. The bioresorbable material preferably has a magnesium alloy according to one of those described in AT 510087 A1

embodiments.

The object stated above is also achieved according to the invention by a set for plate osteosynthesis as stated at the outset, the set comprising at least one plate according to one of the embodiments described herein and at least one fastening element according to one of the embodiments described herein.

tion forms.

The set has the already associated with the plate and the

Fastener described advantages. In particular, the plate is designed for use with the fastening element. The fastening element is designed in particular for use with the panel. The set preferably has at least two, particularly preferably at least three, even more preferably at least four, fastening elements. The radial extent of the bore is in particular at least as large as the radial extent of the expansion sleeve in the non-expanded state. Preferably, the first retaining pin and the head element, in particular a side of the first retaining pin facing the head element and the bearing surface formed by the head element, are at a distance from one another which is at least as large as a distance or between 0.9 times and 1. Is twice the distance between the first retaining pin recess, in particular the first retaining pin contact surface, and the head contact surface. Thus, the insertion of the first retaining pin into the first retaining pin recess can be simplified. If necessary, a deadlock is also achieved. The outer surface of the expansion sleeve in the non-expanded state and the connecting section (except for the retaining pin(s)) preferably lie on an essentially rotationally symmetrical body and preferably correspond essentially to the rotational

tion-symmetrical body.

It is advantageous if the first retaining pin opening of the at least first connecting device of the at least one plate and the at least first retaining pin of the at least one fastening element have complementary cross sections normal to the axial direction. Thus, the insertion of the first retaining pin into the first retaining pin opening is facilitated. Preferably, the first retaining pin recess of the at least first connecting device of the plate is designed in such a way that it holds the first retaining pin of the at least one fastening element

can record.

The invention is described below with reference to preferred exemplary embodiments illustrated in the drawings, to which

but should by no means be limited, explained in detail.

Fig. 1 shows schematically a preferred embodiment of a

plate from above;

Fig. 2 shows schematically the same embodiment of the plate as

1 from below;

Fig. 3 shows schematically the same embodiment of the plate as

1 obliquely from above;

Fig. 4 shows schematically the same embodiment of the plate as

1 obliquely from below;

Fig. 5 shows schematically a preferred embodiment of the

fastener in an unexpanded position;

Fig. 6 shows schematically the same embodiment of the fastening element as in Fig. 5 in a section along the line B-B

in Figure 5 and in a spread out position;

7 schematically shows a further preferred embodiment

of the fastener from below;

Fig. 8 shows schematically the same embodiment of the fastening

tion element as in FIG. 7 from above;

Fig. 9 shows schematically the same embodiment of the fastening

tion element as in FIG. 8 from above;

Fig. 10 shows schematically a preferred embodiment of a

Sets for plate osteosynthesis in a sectional view.

1 shows a preferred embodiment of a plate 1 for plate osteosynthesis from above (in a view orthogonal to a plate upper side 2). Fig. 2 shows the plate 1 from below (in a view orthogonal to a plate underside 3). Fig. 3 shows the plate 1 diagonally from above and Fig. 4 shows the plate 1 diagonally from below. The plate 1 is shown only partially. The border of the respective section is marked by a

dashed line symbolized.

The plate 1 has the plate top 2 and the plate bottom

page 3 on. The plate 1 has at least a first connection device 4 with a first connection opening 6 and a second connection device 5 with a second connection opening 7 . In this exemplary embodiment, the plate 1 has two further connecting devices, each with a connecting opening, the first connecting device 4, the second connecting device 5 and the two further connecting devices each being of the same design. Other connecting devices can also be provided outside of the detail shown. The first connecting device 4, the second connecting device 5 and the two further connecting devices are spaced apart from one another in the longitudinal extension panel 19 of the panel 1. Plate 1 is up

the plate top 2 beveled towards its edge.

The first connecting device 6 is formed:

- through a bore 8 extending from the top side 2 of the plate to the bottom side 3 of the plate for the passage of a substantially rotationally symmetrical body of a fastening element for fastening in a bone part,

- through at least one first retaining pin opening 9 extending from the upper side of the plate 2 and extending radially outwards from the bore 8 along a circumferential section for inserting a first retaining pin protruding from the essentially rotationally symmetrical body of the fastening element and

- by at least one first retaining pin recess 10 between the upper side of the plate 2 and the lower side of the plate 3, which extends radially outwards from the bore 8 along a circumferential section, which adjoins the first retaining pin opening 9 in the circumferential direction and into which a first retaining pin opening 9 guided first retaining pin of the fastening element can be at least partially inserted by rotating about an axis of the essentially rotationally symmetrical body, wherein the first connecting device 4 has at least one first retaining pin contact surface 11, which the first retaining pin recess 10 in the direction of the Plate top 2 limited. The bore 8 is essentially a cylindrical recess, the plate top 2 and the plate bottom

3 breaks through. The first connecting device 4 has a first

tes stop element 12, which limits the first retaining pin recess 10 in a circumferential direction of the bore 8, so that rotation of the fastener by a stop of the first

Retaining pin to the first stop element 12 can be blocked.

The first connection opening 6 can also have a first additional retaining pin recess 10' between the top side 2 and the bottom side 3 of the panel. The first additional retaining pin recess 10' extends radially outwards from the bore 8 along a peripheral section. The first additional trunnion recess 10' is circumferentially adjacent to the first trunnion opening 9, being circumferentially adjacent to the first trunnion opening 9 in the opposite circumferential direction as the first trunnion recess 10. Into the first additional trunnion recess 10', a first retaining pin of the fastening element guided into the first retaining pin opening 9 can be at least partially inserted by rotating about an axis (and in the other direction than for insertion into the first retaining pin recess 10) of the essentially rotationally symmetrical body. The first connecting device 6 has at least one first additional retaining pin contact surface 11', which delimits the first additional retaining pin recess 10' in the direction of the top side 2 of the plate.

borders.

The first retaining pin opening 9 of the first connection opening 6 extends to the underside of the plate 3 and breaks through it. Alternatively, the first holding pin opening 9 could also be limited in the direction of the underside 3 of the plate. The first holding pin recess 10 also extends to the underside of the plate 3 and breaks through it. Alternatively, the first holding pin recess 10 in the direction of the plate underside 3 could

be bordered.

The first retaining pin opening 9, the first retaining pin recess 10 and the first additional retaining pin recess 10' have the same extent in the radial direction with respect to a

NEN center of the hole 8 on.

The first connection opening 6 points on the upper side of the plate 2

24/48

a head recess 13 for receiving a head element of the fastening element, which head recess 13 is delimited by a head contact surface 14 . The head depression 13 is formed by an annular recess starting from the top side 2 of the plate, the center point of which coincides with the center point of the bore 8 and the diameter of which is larger than the diameter of the bore 8. A head element of the fastening element can be accommodated in the head depression 13 who-

the.

The first connection opening 6 is further formed:

- through a second retaining pin opening 15 extending from the upper side of the plate 2 and extending radially outwards from the bore 8 along a peripheral section for the insertion of a second retaining pin protruding from the essentially rotationally symmetrical body of the fastening element, the second retaining pin opening 15 extending from of the bore 8 extends in a different radial direction than the first retaining pin opening 9, and

- by at least one second retaining pin recess 16 between the upper side of the plate 2 and the lower side of the plate 3, which extends radially outwards from the bore 8 along a peripheral section, which adjoins the second retaining pin opening 15 in the peripheral direction and into which a second retaining pin opening 15 guided second retaining pin of the fastener can be at least partially inserted by rotating about an axis of the substantially rotationally symmetrical body, wherein the first connecting device 4 has a second retaining pin contact surface 17, which the second retaining pin recess 16 in the direction of the top side of the panel 2 limited. The second retaining pin opening 15 is spaced apart from the first retaining pin opening 9 , in particular opposite the first retaining pin opening 9 . The first connecting device 4 has at least one second stop element 18, which delimits the second retaining pin recess 16 in a circumferential direction of the bore 8, so that the fastening element is rotated by a stop of the second retaining pin

the second stop element 18 is blocked.

Fig. 5 shows a preferred embodiment of the fastening

elements 20 for attaching the plate 1 to a bone part for plate osteosynthesis in a non-spread position. Fig. 6 shows the same embodiment of the fastener 20 as Fig. 5 in a section along the line B-B in Fig. 5 and in an expanded position. A fastener 20 of the same embodiment as Fig. 5 is also shown in Fig. 10 (the right one of the two fasteners 20) in section along B-B

shown in the unexpanded state.

The fastening element 20 has a head element 21 which is connected to an expansion sleeve 22 via a connecting section 23 . The outer surfaces of the connecting section 23 and the expansion sleeve 22 lie on a surface of revolution. The fastening element 20 also has a wedge element 24 . In a conical section, the wedge element 24 has a cross section that increases in an axial direction 25 . The expansion sleeve 22 is at least partially pushed onto the wedge element 24 . By moving it relative to the wedge element 24, the expansion sleeve can be expanded by the conical section. Furthermore, the fastening element 20 has a pull rod 26 with which the wedge element

24 can be moved relative to the expansion sleeve 22.

The wedge element 24 and the pull rod 26 have interacting connecting devices 28 with which the wedge element 24 can be displaced relative to the expansion sleeve 22 . The wedge element 24 has a first thread 29 and the pull rod 26 has a second thread 30 complementary to the first thread 29 as the interacting connecting devices 28 . The first thread 29 is designed as an internal thread and the second thread 30 as an external thread. The wedge element 24 can thus be displaced relative to the expansion sleeve 22 by twisting the pull rod 26 . In order to ensure (in addition to the frictional resistance) that when the pull rod 26 is twisted, the wedge element 24 does not rotate with it, but rather is displaced, the wedge element 24 has at least one radially protruding anti-rotation projection 31 which extends in the axial direction 25 and which is inserted into a -

Section 32 in the expansion sleeve 22 engages.

The connecting portion 23 and the pull rod 26 each have

a stop element 33, 34, which allows a displacement of the train

block rod 26 relative to the expansion sleeve 22 in at least one axial direction 25, which direction points in the direction of an increasing cross-section of the wedge element 24 in the conical section. This prevents the pull rod 26 from being displaced when it is turned and ensures that the

Wedge element 24 is tightened.

The head element 21 has a greater radial extent than the connecting section 23 and the head element 21 forms a bearing surface 35 adjoining the connecting section 23 and facing the expansion sleeve 22. The bearing surface 35 lies in the disk 1 against a head bearing surface 14.

The pull rod 26 has a first screw head drive element 36 in the form of an internal screw head profile at one end thereof. With the first screw head drive element 36 can easily

Torque can be exerted on the pull rod 26.

The expansion sleeve 22 has at least two incisions 32 running from an edge 38 of the expansion sleeve 22 that delimits the expansion sleeve 22 in an axial direction 25 and faces away from the head element 21 . The incisions 32 thus limit the wings

expansion sleeve 22.

The expansion sleeve 22 has grooves and/or ribs 39 running in the circumferential direction on its outer surface. These improve the hold of the fastening element 20 in a bone part, esp.

especially in the axial direction 25.

Furthermore, a second retaining pin 40 protrudes radially outwards from the connecting section 23 in a different direction than the first retaining pin 27 . The second retaining pin 40 is arranged opposite the first retaining pin 27 . With the second retaining pin 40, the stability of the connection between

Fastener 20 and plate 1 improved.

Fig. 7 shows a further preferred embodiment of the fastening element from below at an angle. FIG. 8 shows the same embodiment of the fastening element as FIG. 7 from above. 9

shows the same embodiment of the fastening element as in Fig.

8 from above. A fastener 20 of the same embodiment as FIG. 7 is also shown in FIG. 10 (the left of the two fastener

elements 20) shown in a sectional view.

The same reference numerals are used for the embodiment of FIG. 7 as for FIG. 5 and reference is made to the description in connection with FIG. The embodiment of FIG. 7 differs from the embodiment of FIG. 5 in that the wedge element 24 and the pull rod 26 are designed in one piece. Therefore, the wedge element 24 and the pull rod 26 are also moved together. For this purpose, the wedge element 24 and the tie rod 26 on the one hand and the expansion sleeve 22 and the connecting section 23 on the other hand have interacting connecting devices 41 with which the wedge element 24 and the tie rod 26 can be displaced relative to the expansion sleeve 22 . Since the pull rod 26 has to be displaced in this embodiment, there are also no stop elements 33, 34 (which would block such a displacement). On the one hand, the wedge element 24 and the pull rod 26 have an external thread as interacting connecting devices 41 . On the other hand, the expansion sleeve 22 and the connecting section 23 have an external thread complementary thereto. As can be seen in FIG.

nominal hexagonal profile provided.

10 schematically shows a preferred embodiment of a set 60 for plate osteosynthesis. The set 60 has a plate 1 which is designed in the same way as the embodiment described in connection with FIG. A section of the plate 1 is shown in FIG. 10, the boundaries of the section being indicated by dashed lines. The sectional plane runs through the central longitudinal axis of the plate 1 in FIG. 1. The set 1 also has two fastening elements 20 in this embodiment. The right fastening element 20 is designed according to the embodiment described in connection with FIG. 5 and the left fastening element 20 is designed according to the embodiment described in connection with FIG. 7 . The left fastener 1 is in the first connection opening 6 and the right fastener 1 in

the second connection opening 7 is introduced. The fasteners

Elements 2 are each turned so that their first and second retaining pin 27, 40 are introduced into the first and second retaining pin recess 10, 16 of the respective connecting device 4, 5 (not in the sectional plane and therefore not visible). A stable connection between the plate 1 and the respective fastening element 20 is thus achieved. The fasteners

te 20 are shown in the unexpanded state.

Claims (27)

Patent Claims: 1. Plate (1) for plate osteosynthesis, with a plate upper side (2), a plate lower side (3) and at least one first connecting device (4) with a first connecting opening (6) and a second connecting device (5) with a second connecting opening (7) , characterized in that the first connection opening (6) is formed - through a bore (8) extending from the upper side (2) of the plate to the underside (3) of the plate for the passage of a substantially rotationally symmetrical body of a fastening element for fastening in a bone part, - through at least one first retaining pin opening (9) extending from the top side (2) of the plate and extending radially outwards from the bore (8) along a peripheral section, for the insertion of a first retaining pin protruding from the essentially rotationally symmetrical body of the fastening element and - through at least one first retaining pin recess (10) between the top side (2) and the underside (3) of the plate, which extends radially outwards from the bore (8) along a peripheral section, which is attached to the first retaining pin opening (9) in the circumferential direction and into which a first retaining pin of the fastening element, which is guided into the first retaining pin opening (9), can be at least partially inserted by rotation about an axis of the essentially rotationally symmetrical body, the first connecting device (4) having at least one first retaining pin Has contact surface (11), which the first retaining pin recess (10) in the direction of the platen top (2) limited. 2. Plate (1) according to claim 1, characterized in that the first connecting device (4) has at least one first stop element (12) which delimits the first retaining pin recess (10) in a circumferential direction of the bore (8), so that a Rotation of the fastener by a stop of the first Retaining pin to the first stop element (12) can be blocked. 3. Plate (1) according to claim 1 or 2, characterized in that that the first retaining pin opening (9) of the first connection opening (6) extends to the underside of the plate (3). 4, plate (1) according to any one of the preceding claims, characterized in that the first retaining pin opening (9) and the first retaining pin recess (10) the same extension in the radial direction based on a center point of the bore (8) on- point. 5. Plate (1) according to any one of the preceding claims, characterized in that the first connection opening (6) at the Plate top (2) has a head recess (13) for receiving a head element of the fastener, which head Depression (13) is limited by a head contact surface (14). 6. Disk (1) according to claim 5, characterized in that the head depression (13) is formed by a disk top (2) emanating annular recess whose center coincides with the center of the bore (8) and whose diameter is larger is than the diameter of the bore (8). 7. Plate (1) according to any one of the preceding claims, characterized in that the first connection opening (6) is further formed - through a second retaining pin opening (15) extending from the upper side of the plate (2) and extending radially outwards from the bore (8) along a peripheral section, for the insertion of a second retaining pin protruding from the essentially rotationally symmetrical body of the fastening element, the second The retaining pin hole (15) extends from the bore (8) in a different radial direction than the first retaining pin hole (9), and - through at least one second retaining pin recess (16) between the top side (2) and the underside (3) of the plate, which extends radially outwards from the bore (8) along a peripheral section, which is attached to the second retaining pin opening (15) adjoining in the circumferential direction and into which a second retaining pin guided into the second retaining pin opening (15). of the fastener by rotation about an axis of the we essential rotationally symmetrical body at least partially can be introduced, wherein the first connecting device (4) has a second retaining pin contact surface (17) which the second retaining pin recess (16) in the direction of the plate surface side (2) limited. 8. Plate (1) according to claim 7, characterized in that the first connecting device (4) has at least one second stop element (18) which has the second retaining pin recess (16) limited in a circumferential direction of the bore (8), so that a rotation of the fastening element by a stop of the second retaining pin on the second stop element (18) only is cked. 9, plate (1) according to any one of the preceding claims, characterized in that the second connecting device (5) ident how the first connecting device (4) is designed. 10. Plate (1) according to any one of the preceding claims, characterized in that the first connecting device (4) and the second connecting device (5) in the longitudinal direction direction (19) of the plate (1) are spaced from each other. 11. Plate (1) according to any one of the preceding claims, characterized by a bioresorbable material, in particular material gnesium. 12. Fastening element (20) for fastening a plate (1) with a bone part for plate osteosynthesis, having: - a head element (21); - an expansion sleeve (22) which is connected to the head element (21) via a connecting section (23), the outer surfaces of the connecting section (23) and the expanding sleeve (22) lying on a surface of revolution; - a wedge element (24), which in a conical section has a cross section that increases in an axial direction (25), the expansion sleeve (22) being pushed at least partially onto the wedge element (24) and being moved from the conical section can be spread; - A pull rod (26) with which the wedge element (24) relative can be moved to the expansion sleeve (22); characterized in that from the connecting section (23) at least one first retaining pin (27) protrudes radially outwards. 13. Fastening element (20) according to claim 12, characterized in that the wedge element (24) and the pull rod (26) have cooperating connecting devices (28) with which the wedge element (24) relative to the expansion sleeve (22) ver- is slidable. 14. Fastening element (20) according to claim 13, characterized in that as interacting connecting devices (28) the wedge element (24) has a first thread (29) and the tie rod (26) has a second thread (30) complementary to the first thread (29). has, wherein in particular the first thread (29) is formed as an internal thread and the second thread (30) as an external thread. 15. Fastening element (20) according to any one of claims 13 or 14, characterized in that the wedge element (24) has at least one radially projecting, in particular extending in the axial direction, rotation locking projection (31) in a Incision (32) engages in the expansion sleeve (22). 16. Fastening element (20) according to claim 12, characterized in that the wedge element (24) and the pull rod (26) are rigidly connected to one another or can be connected, in particular are formed in one piece. 17. Fastening element (20) according to claim 15, characterized in that the wedge element (24) and/or the pull rod (26) on the one hand and the expansion sleeve (22), the connecting section (23) and/or the head element (21) on the other hand interact Have connecting devices (41) with which the wedge element (24) and the pull rod (26) relative to the expansion sleeve (22) are movable. 18. Fastening element (20) according to any one of claims 12 to 17, characterized in that the head element (21), the connection formation section (23) and / or the expansion sleeve (22) on the one hand and the pull rod (26), on the other hand, each have a stop element (33, 34) which blocks a displacement of the pull rod (26) relative to the expansion sleeve (22) in at least one axial direction (25), the direction preferably being in the direction of an increasing cross section of the Wedge element (24) shows in the conical section. 19. Fastening element (20) according to one of claims 12 to 18, characterized in that the head element (21) has a greater radial extension than the connecting section (23) and the head element (21) adjoins the connecting section (23), the Expansion sleeve (22) facing the bearing surface (35). 20. Fastening element (20) according to any one of claims 12 to 19, characterized in that the pull rod (26) has a first screw head drive element (36), in particular in the form of an internal nenschraubkopfprofils, having at one end. 21. Fastening element (20) according to any one of claims 12 to 20, characterized in that the head element (21) is a second Has screw head drive element. 22. Fastening element (20) according to one of Claims 12 to 21, characterized in that the expansion sleeve (22) has at least two edges (38 ) the Expansion sleeve (22) has running incisions (32). 23. Fastening element (20) according to one of claims 12 to 22, characterized in that the expansion sleeve (22) has grooves and/or ribs running in the circumferential direction on its outer surface (39). 24. Fastening element (20) according to one of Claims 12 to 23, characterized in that a second retaining pin (40) projects radially outwards from the connecting section (23) in a different direction than the first retaining pin (27), which second retaining pin (40 ) preferably opposite the first holding pin (27) is arranged. 25. Fastening element (20) according to any one of claims 12 to 23, characterized by a bioresorbable material, in particular re magnesium. 26. Set (60) for plate osteosynthesis, characterized by at least one plate (1) according to one of claims 1 to 11 and at least one fastening element (20) according to one of claims 12 to 25. 27. Set (60) according to claim 26, characterized in that the first retaining pin opening (9) of the at least first connecting device (4) of the at least one plate (1) and the at least first retaining pin (27) of the at least one fastening element (20 ) complementary cross-sections normal to the axial direction (25) exhibit.