DE202008017200U1 - Surgical rasp handle and surgical rasp - Google Patents

Abstract

surgical Rasp handle (12) for releasable connection to a rasp body (14) by means of a coupling mechanism (30) for forming a surgical rasp (10), the rasp handle (12) having a first Bearing surface (72) which in a connection position, in which the rasp body (14) and the rasp handle (12) connected to each other at a second contact surface (24) of the rasp body (14) rests, wherein the rasp handle (12) a first coupling element (32) is formed or arranged is, which forms part of the clutch mechanism (30) and in the connecting position with a second, on the rasp body (14) trained or arranged coupling element (34) force and / or positive or substantially kraftund / or positive fit engageable, characterized in that the first Coupling element (32) at least two relatively movable Coupling members (66, 68) includes that the first coupling member (66) for transferring the rasp (10) from a Release position, in which the rasp handle (12) and the Grater body (14) separated or loose with each other are connected, can be brought into the connection position ...

Description

The The present invention relates to a surgical rasp handle for releasably connecting to a rasp body by means of a coupling mechanism for forming a surgical rasp, wherein the rasp handle identifies a first contact surface, which in a connecting position, in which the rasp body and the rasp handle are connected together, at a second Rests contact surface of the rasp body, wherein formed or arranged on the rasp handle a first coupling element is, which forms part of the clutch mechanism and in the Connection position with a second, on the rasp body trained or arranged coupling element force and / or positive or substantially non-positive and / or positive can be brought into engagement.

Further The present invention relates to a surgical rasp with a rasp body, a rasp handle and a clutch mechanism for detachably connecting the rasp body and the Rasp handle, wherein the Raspelgriff a first and the Raspelkörper have a second contact surface, which in a connecting position, in which the rasp body and the rasp handle with each other are connected, abut each other, which clutch mechanism a first, arranged on the rasp handle or trained coupling element and a second one formed on the rasp body Coupling element comprises, which in the connecting position force and / or positive or substantially power and / or interlock positively.

surgical Rasps of the type described are used in surgery for used many purposes. In particular, they serve to a bone bed to prepare for receiving an implant part. For example Bone rasps are used to make a cavity in one Preparing femur for receiving a shaft of a hip joint endoprosthesis.

A rasp of the type described is for example from the EP 0 744 917 B1 known. In the known rasp, it is particularly disadvantageous that the parts for connecting the rasp handle to the rasp body lie wholly or partially above a resection plane of the femur. Namely, such a construction has several disadvantages. The connection of the rasp handle with the rasp body requires a relatively large amount of space and therefore restricts the free space of the surgeon in the wound area during surgery. Furthermore, a backlash of the EP 0 744 917 B1 known coupling mechanism is not guaranteed, so that such operations were carried out with the assistance of a navigation system, but the required and desired accuracy in the navigation of the rasp was not guaranteed. Furthermore, the rasp above the resection level must be oriented to the geometry of the implant, if the rasp, in particular the rasp body, should also be used for trial reduction. Therefore, the rasp handle must be based on the geometry of the later implant. Consequently, a rasp handle adapted to this family is needed for each conventional prosthetic family. Rasps in which the rasp handle is provided with a female coupling element and the rasp body with a male coupling element have the disadvantage that the male part of the rasp body can protrude into the wound area and thus hinder a minimally invasive surgical technique. Furthermore, this has the consequence that a surgical technique must be used in which the acetabulum must be prepared first, so the free wound area, and then only the prosthesis stem or the rasp body is used for a trial reduction, in which case due to the configuration of the second coupling element the rasp body protrudes at least partially into the wound area. However, such a surgical technique is not optimal, since in a possible malposition of one of the components, that is, in a hip joint endoprosthesis, the shaft or the pan, for the surgeon more opportunities in the acetabulum for a correction than on the hip stem. It would therefore be desirable first to implant the stem, to control the position of the implant stem in the bone, and to be able to make any corrections in a subsequent processing of the actabulum here.

It is therefore an object of the present invention, a surgical Rasp handle and a surgical rasp the described above Art to improve so that a handling of the same, in particular In minimally invasive operations, it becomes easier and safer.

These Task is a surgical rasp handle described above Art solved according to the invention that the first coupling element at least two relatively movable Coupling members comprises that the first coupling member for transferring the rasp from a release position, in which the rasp handle and the rasp body separated or loose with each other are connected, can be brought into the connection position by a Movement in the distal direction in the second coupling member in the release position unfilled space one the second coupling element forming recess movable into it is.

The inventively proposed development of a rasp handle of the type described above allows a simple way to use the rasp handle in minimally invasive surgical procedures. It is particularly possible to use a rasp body which has only a single female coupling element. This also has the advantage that, for a trial reduction, the rasp body inserted into the machined bone cavity does not project beyond a resection plane with a coupling element for connection to the rasp handle. Thus, a surgical technique is possible in which the shaft of the prosthesis can be optimally inserted first into a femur and anchored in this. The coupling mechanism can be made very compact overall, since the first coupling element of the rasp handle must be inserted substantially only in the distal direction in the second coupling element of the rasp body, which is in the form of a recess. It only requires a movement of the first coupling member relative to the second coupling member in a distal or substantially distal direction for a secure and in particular backlash-free connection of the rasp handle with the rasp body. Furthermore, such a rasp handle can be universally connected to rasp bodies of a wide variety of prosthesis families, so that the number of rasp handles to be provided, for example, in a hospital can be significantly reduced. In particular, the recess may have an inner cross-section, which increases continuously, at least in sections, starting from the second contact surface in the distal direction. The recess may optionally also have a recess section, which is enlarged in comparison to an inner cross section in the region of the second contact surface. In this case, the inner cross section can remain constant in the region of the recess section, increasing or decreasing in the distal direction. In particular, all conceivable shapes of the recess are possible, which define an undercut thereof, in which engages the first coupling member in the connecting position. The recess preferably has at least two recess sections which have a different internal cross section. As a result of the development according to the invention, a defined positive connection between the cooperating elements of the rasp handle and the rasp body can be produced in a simple manner in particular.

Advantageous it is when the first coupling member slidably on the rasp handle is stored. Due to the sliding storage, a movement of the first coupling member relative to the second coupling member easy and be given safely in a defined way. This does it in particular, also possible to navigate the rasp handle surgical interventions.

Conceivable It would be that a cross-section of the first coupling member when moving in a distal or substantially distal direction, in particular increased. Especially easy is the Formation of the coupling mechanism when a shift direction, in which the first coupling member is displaceable, relative to one with respect to the first or second contact surface perpendicular extending surface normal to a displacement direction angle is inclined. The inclination of the displacement direction angle allows it, the first coupling member, for example in the second coupling element, which is in the form of an undercut recess, so introduce it after inserting the second coupling member in the recess so blocked, that is in particular positive and / or positive holds that it can not be removed in the connection position. The first coupling member may therefore also be referred to as a blocking member which, after transferring into the connecting position a simple and defined locking of the second coupling member in the recess defining the second coupling element, allows.

Especially simple in the manufacture and in the operation becomes the surgical one Rasp handle when the displacement angle is a value in one Range of 1 ° to 80 °.

advantageously, The displacement angle has a value in a range from 10 ° to 50 °. So can in particular a secure connection between the rasp handle and the rasp body can be achieved without too much transversal motion component based on a surface normal of the first and / or second Investment surface is required.

conveniently, are the first and second contact surface flat or in Essentially flat and / or structured. Preferably, they are complete just up to the respective coupling elements. this makes possible it, the rasp body so in the bone cavity to be processed introduce that the second contact surface for example lies in a resection plane of the femur. So no parts protrude of the rasp body in the wound area and can thus not a surgeon during the procedure hinder. This is especially true for minimally invasive procedures especially advantageous. Have structured contact surfaces the advantage that the connection of the rasp handle with the Raspelkörper when Abut one another of the contact surfaces in addition is stabilized. The contact surfaces can in particular be flat and provided with a structure, for example jagged, in the form of teeth, rows of teeth, grooves, depressions or a regular pattern of surfaces Protrusions and depressions.

For a particularly good connection, in particular locking, of the rasp body and the rasp handle with each other, it is convenient if the second coupling member a sliding surface for the first coupling member defines such that the first coupling member when transferring the rasp from the release position slip into the connection position on the sliding surface can. The Aufgleitfläche can on the one hand a defined Specify movement of the first coupling member and the other the first Coupling member when inserted into the second coupling element support.

According to one preferred embodiment of the invention may be advantageous when the sliding surface is a sliding surface angle based on the surface normal of the first or second Fixed contact surface and when the sliding surface angle is the same or greater than the displacement angle. In particular, when the Aufgleitflächenwinkel larger is as the displacement angle, it can be one of the connection between the rasp handle and the rasp body promoting wedging the first and second coupling elements come together.

advantageously, The sliding surface angle has a value in a range from 5 ° to 85 °. So especially in connection with an appropriate displacement angle an optimal and defined clamping between the first and second coupling elements be reached, defined by the rasp handle and the rasp body to connect with each other.

Preferably the slip surface angle has a value in a value from 15 ° to 50 °. Such a sliding surface angle is in particular at a displacement angle with a value in a range of 10 ° to 50 °, with minimal effort during transfer the rasp handle from the release position into the connecting position an optimal and defined connection of the rasp handle with the To obtain grating body.

Of the Structure of the rasp handle can be characterized, for example simplify that the second coupling member immovable on the rasp handle is arranged. The rasp handle can thus only by a Movement of the first coupling member, relative to the second Coupling member, transferred from the release position to the connection position become.

Cheap However, it may also be when the second coupling member movable is mounted on the rasp handle. By appropriate movement of the two Coupling members can then so the rasp handle from the release position be transferred to the connection position and vice versa.

Advantageous it is when a distal end of the first coupling member a defined first coupling portion, whose cross-section starting continuously increases from the distal end. This configuration allows In addition to an undercut, it also has a conical shape Jamming or cone clamping between the first coupling member and one of the second coupling member not filled area or space of the second coupling element form.

The Handling of the rasp handle and the associated rasp body is greatly simplified and improved when the first and the second abutment planes define which transverse or in the Substantially transverse to longitudinal axes of the rasp handle and / or of the rasp body. In particular, they are lost transverse or substantially transverse to longitudinal axes of sections of the rasp handle and the rasp body, which are the first or second contact surface. So can one Operators directly recognize in which direction a connection between the rasp body and the rasp handle are made can. Furthermore, forces can be so direct in one Connec tion direction, which by, for example, longitudinal axes the coupling elements is defined to be initiated.

According to one Another preferred embodiment of the invention a part of the clutch mechanism forming release / locking lever be provided, which is mounted pivotably and / or displaceably and coupled directly or indirectly to the first coupling member is. Preferably, the release / lock lever is directly on Rasp handle pivotally mounted. By the storable storage can in particular high actuation forces introduced and transmitted to the first coupling member become. In particular, the first coupling member can also be in one piece are formed with the release / locking lever. Of Further, the release / lock lever can also be arranged one that he undergoes during a surgical procedure outside the actual wound area is located. This facilitates both solving as well as connecting with one in one Patient body introduced Raspelkörper.

Especially can form stable the coupling mechanism, if arranged the first coupling member distally on a push and pull member or is training. It can therefore in particular in one piece formed or fixed to the push and pull member, either releasably or permanently connected.

Preferably, a guide for the push and pull member is provided on the rasp handle. In particular, it is favorable if the push and pull member parallel to the displacement direction of the rasp handle is slidably mounted. Such guidance of the push and pull member can in particular ensure that the first coupling member disposed thereon can not escape in an undesired manner and thus is always movable in a defined manner relative to the second coupling member.

Around an optimal power transmission to the first coupling member To obtain, it is favorable if the push and pull member Slidably mounted parallel to the direction of the Raspelgriff is.

Advantageous it may also be, if a stop device is provided for limiting movement of the first coupling member in the distal and / or proximal direction. The stop device can in particular include one or more attacks directly and indirectly interact with the first coupling member and a movement thereof in the distal or proximal direction limit. Preferably one or two stops are provided, which simultaneously one Can form part of the guidance of the push and pull member, so that overall achieves a very compact construction of the rasp handle can be.

Around optimal power transmission from the release / lock lever to reach the push and pull link, it is convenient when the push and pull link is movable with the release / lock lever is coupled. In particular, such a coupling can to an articulated coupling in the form of a pivot and / or sliding connection between the push and pull member and the release / lock lever act. Depending on the storage of the release / locking lever or the push and pull member on the rasp handle can movable coupling of the two parts one, two or more Provide degrees of freedom of movement, for example a rotational degree of freedom and / or a translational degree of freedom.

In order to the rasp handle is not inadvertently inadvertently from the, grating body can solve, it is advantageous if a locking device is provided for locking of the rasp handle in the connecting position.

Especially simply the locking device can be formed, when it is configured to lock the release / lock lever on the rasp handle in the connecting position.

A Locking can be achieved in a simple way that the locking position comprises at least one securing member, which in the release position with the release / locking lever out of engagement and in a locking position with the Release / locking lever is engaged. Then, when the at least one securing member with the release / locking lever is in particular a movement of the same relative to the grater handle are prevented, which at the same time a movement the first coupling member with a corresponding coupling of the release / locking lever prevented with the first coupling member.

Preferably is the locking device in the connecting position in the Locking position brought. For example, it can be so formed be that only when the rasp handle the connection position occupies, the locking device in the locked position can be transferred is, for example, a movement of the first coupling member to prevent.

A simple and secure locking in the locked position can be made possible in particular by the release / locking lever and the at least one securing member in the locking position force and / or positively engaged. So can at least one relative movement of the release / locking lever relative to the at least one securing member in the locking position be prevented.

in principle it would be conceivable, the at least one securing member pivotable store on the rasp handle. Conveniently, it is slidably mounted on the rasp handle. So the rasp handle altogether be made very slim. In particular, the securing member be arranged so that it in its most distal position, the locking position occupies. In other words, it means that it is more proximal Direction can be moved to the locking device unlock, which then simultaneously a movement of the first coupling member also in the proximal or substantially proximal direction. The United connection position and the locking position are in one such case oriented the same, that is a connection or locking takes place in each case in a distal position, the Loosen or unlock each in a proximal Position of each movably mounted elements.

Especially simply this can be at least one fuse link Arrange on the rasp handle when it is parallel or substantially parallel is movable to a longitudinal axis defined by the rasp handle. The longitudinal axis may also be a longitudinal axis a non-negligible portion of the rasp handle act, such as a proximal or distal portion thereof.

To ensure that the rasp handle can not automatically solve the rasp body, it is advantageous if the at least one securing member in a basic position the locking position occupies. The at least one securing member must therefore be actively moved to unlock the locking device by an operator.

In order to It can be ensured that the at least one securing member it is in a home position the locking position favorable if the at least one securing element forcibly is held in the basic position.

Preferably is the at least one securing member resiliently biased in the Basic position held. So it is possible, for example with a simple spring element, for example a coil spring or a leaf spring, the at least one securing member in the Basic position.

Cheap It may also be when the at least one securing member by a restoring device held in the basic position is. The restoring device makes it possible in particular, the at least one, deflected from the basic position securing member back to the basic position to lead over. The restoring device can in particular in the form of a elastically resilient element, such as a screw, plate or leaf spring may be formed.

According to one preferred embodiment of the invention can also be provided be that the at least one securing member a first securing projection or having a first securing recess, which in the locking position with a corresponding second securing recess or a corresponding second securing projection of the release / locking lever engaged. By simply engaging the at least a securing member with the corresponding element of the release / locking lever so the locking position can be defined defined.

Around the at least one securing member in the desired manner to be able to move, for example, to transfer the locking device of the locking position in the Release position and / or vice versa, it is advantageous if the at least one securing member at least one operating portion which has an outer contour the rasp handle protrudes. On the one hand, an operator can do this immediately recognize a position of the locking device and the other the Press locking device, for example, they enable or disable.

to Improvement of the ergonomics of the rasp handle is favorable, when the release / lock lever in the locked position a part of an outer contour of the rasp handle forms. The release / locking lever is then not in particular from the remaining part of the rasp handle. This allows, for example, that an operator holding the rasp handle the release / lock lever at the same time with embraces and thus additionally in the Locking position holds.

Cheap it is when the release / locking lever in the form or is formed substantially in the form of a toggle lever, with which an introduced into an operating part locking force for transmission can be amplified on the first coupling member. Especially the release / lock lever can be two different having long legs, wherein the longer leg, which then forms the actuating part, by an operator to transfer the release / lock lever actuated and the short legs of the toggle lever with the first coupling member directly or indirectly connected.

Around a rasp body connected to the rasp handle in the desired Introduce way into a bone cavity, in particular to beat, too can, it is convenient if at a proximal end of the rasp handle a striking face pointing in the proximal direction is trained.

The The object initially posed is in a surgical rasp of Initially described type according to the invention thereby solved that the first coupling element at least two relatively movable coupling members comprises that the second Coupling element in the form of a starting from the second contact surface formed in the rasp body extending recess and that the first coupling member for transferring the rasp from a release position, in which the rasp handle and the rasp body separated or loose with each other are connected, in the connection position in the distal direction in the not filled by the second coupling member in the release position Space of the recess is movable into it.

Such a surgical rasp makes it possible in particular to be used in minimally invasive surgical procedures. In particular, an exclusively female trained second coupling element on the rasp body allows a space-saving design that leaves a surgeon a maximum amount of space after removal of the rasp handle in the wound area. In particular, the recess may have an inner cross-section, which increases continuously, at least in sections, starting from the second contact surface in the distal direction. The recess may optionally also have a recess portion, which in comparison to an inner cross section in the area the second contact surface is increased. In this case, the inner cross section can remain constant in the region of the recess section, increasing or decreasing in the distal direction. In particular, all conceivable shapes of the recess are possible, which define an undercut thereof, in which engages the first coupling member in the connecting position. The recess preferably has at least two recess sections which have a different internal cross section. As a result of the development according to the invention, a defined positive connection between the cooperating elements of the rasp handle and the rasp body can be produced in a simple manner in particular.

conveniently, is the rasp handle of the rasp in the form of one of the above Rasp handles formed. He will then also the already in connection with the preferred embodiments described above explained advantages in an analogous manner.

advantageously, has the second bearing surface in the proximal or substantially in the proximal direction and surrounds the recess annular. This allows optimal support of the rasp handle on the rasp body be achieved. In an analogous manner, the first contact surface the two coupling members are surrounded annularly.

Especially it is favorable if the rasp in the form of a Hüftprothesenraspel is trained. So you can easily cavities with her be prepared in a femur for receiving a hip joint endoprosthesis shaft.

advantageously, are two or more releasably connectable to the rasp handle, differently shaped rasp body provided to form a surgical rasp set. Such a surgical rasp set So comes with only a single rasp handle. As required, especially considering a present Physiology of the patient, then can be the optimally suitable rasp body to be selected. All rasp bodies can be connected with the one rasp handle, so that the total for one surgery required instruments in numbers can be minimized. This also reduces in particular the cost of a surgical procedure, since only a minimal number cleaned and sterilized on instruments after surgery must become.

The following description of preferred embodiments The invention is in connection with the drawing of the closer Explanation. Show it:

1 a side view of a surgical rasp with a rasp handle and a rasp body inserted into a femur;

2 : A partially sectioned longitudinal view of a distal portion of the rasp handle 1 in the connection position;

3 : a view similar 2 in the release position;

4 a partially sectioned view of the rasp in the connection area between the rasp handle and the rasp body in the release position; and

5 : a view analog 5 in the connection position.

In the 1 to 5 is a total with the reference numerals 10 provided surgical rasp. It includes a rasp handle 12 and one with the rasp handle 12 releasably connectable grater body 14 ,

The rasp body 14 includes a shaft 16 , which with a variety of rasping teeth 18 is provided to the medullary canal 20 of a femur 22 prepare a patient for the implantation of a not shown in the figures shaft of a hip joint endoprosthesis. The rasp body 14 is also preferably used for a trial reduction and therefore has an outer contour which is very similar to or substantially identical to that of the prosthesis stem actually to be implanted. The rasping teeth 18 can vary depending on the shape of the shaft 16 on all or part of the outer surface of the shaft 16 be arranged or formed.

The rasp 10 can also have several differently shaped rasp bodies 14 so as to form a surgical rasp set. This means that the rasp handle 12 with the different rasp bodies 14 optionally connectable. Different rasps 14 are preferably provided to select the optimal matching prosthesis stem and the corresponding rasp body depending on the physiology of the patient 14 for the preparation of the medullary cavity 20 which is a cavity in the femur 22 to be able to prepare.

A proximal end of the rasp body 14 is defined by a pointing in the proximal direction and within the meaning of the claims as a second contact surface 24 designated end face. The rasp body 14 is preferably chosen so that the second bearing surface 24 lying in a certain level, the so-called resection level 26 , In this han It is the plane defined by the saw cut to resect the femoral head. It thus remains on the femur 22 a pointing in the proximal direction, the medullary cavity 20 surrounding endface 28 , The rasp body 14 is preferably chosen so that the second bearing surface 24 in the resection level 26 or slightly distal from it when the stem 16 for a trial reduction in the medullary cavity 20 is introduced.

For connecting the rasp handle 12 with the rasp body 14 serves a total with the reference numeral 30 provided clutch mechanism. This comprises a first coupling element described in more detail below 32 the rasp handle 12 and a second coupling element 34 of the rasp body 14 , The second coupling element 34 is formed by a recess 36 which is essentially a longitudinal axis 38 defining blind hole 40 includes, which in principle may have any cross-section. Preferably, the cross section of the blind hole is perpendicular to the longitudinal axis 38 out of round, for example oval, so that when engaging the coupling elements 32 and 34 at the same time an anti-rotation is formed, which is a rotation of the rasp handle 12 and the rasp body 14 relative to each other about the longitudinal axis 38 avoided. The longitudinal axis 38 is perpendicular to the second contact surface 24 oriented.

The recess 36 is additionally with a lateral undercut 42 provided, which one with respect to the longitudinal axis 38 inclined side surface 44 having. The undercut 42 extends from a recess 36 in the resection level 26 circumferential edge 46 which alone through the blind hole 40 is defined in a sidewall 48 the blind hole 40 into it, so that an inner cross-section of the recess 36 starting from the edge 46 in the distal direction to the distal end 50 of the undercut 42 increases in sections, ie in the area of the undercut 42 defined portion of the recess 36 , A distal end 52 the blind hole 40 has a cross-sectional area, that of the edge 46 surrounded or essentially corresponds to surrounded cross-sectional area.

The rasp handle 12 comprises an elongated, rectangular in cross-section shaft 54 which has a distal shaft portion 56 and a proximal shaft portion 58 includes. longitudinal axes 60 and 62 of the distal shaft portion 56 or the proximal shaft portion 58 are inclined to each other at an angle 64 from about 25 °. The length of the distal shaft section 56 is about one fifth of the total length of the shaft 54 ,

The first coupling element 32 includes a first, on the shaft 54 movably mounted coupling member 66 and a second, on the shaft 54 fixedly arranged second coupling member 68 , The second coupling member 68 is from a distal facing end face 70 essentially perpendicular, leaving the end face 70 at the same time a first coupling element 32 annularly surrounding first contact surface 72 defined, which is flat and perpendicular to the longitudinal axis 60 runs. The second coupling member 68 is essentially complementary to the blind hole 40 trained, in the form of a pin 74 , which is flattened on one side, so that it has a sliding surface 76 for the first coupling member 66 Are defined. One between the sliding surface 76 and the longitudinal axis 38 enclosed sliding surface angle 78 is approximately 25 ° in the embodiment shown in the figures. An end face 80 of the pin 74 lies in a connection position of the rasp 10 flat at a bottom of the blind hole 40 at. By partially removing the pin 74 a total remains with the reference numeral 84 provided space, which both the removed part of the pin 74 as well as the undercut 42 includes and to the sliding surface 76 borders. The so after insertion of the pin 74 into the recess 76 remaining space 84 it tapers slightly in the distal direction and is therefore conically shaped as a whole. He can go through a distal end 85 of the first coupling member 66 , which has a first coupling section 86 defined to be filled in the connection position. The first coupling section 86 preferably has a cross-section which, starting from the distal end 85 increases continuously in the proximal direction up to a second coupling section 88 of the first coupling member 66 , which has a proximal end part of the first coupling member 66 defined and formed substantially cylindrical.

The first coupling member 66 is parallel to a longitudinal axis 90 displaceable, which defines a displacement direction. The longitudinal axis 90 runs essentially parallel to one from the room 84 defined longitudinal axis. The first coupling member 66 can thus in the distal direction after insertion of the second coupling member 68 in the Aufnehmung 36 , and that in the unfilled in the release position space 84 , are moved in by a movement in the distal direction. This is to be understood in particular that the movement has at least one directional component which is parallel to the longitudinal axis 38 is oriented. When inserting the first coupling member 66 in the room 84 into it slides the first coupling member 66 at the sliding surface 76 on and jammed in the room due to a Konusklemmung. At the same time, the second coupling member 68 in the recess 36 secured, by the fact that the first coupling member 66 in the undercut 42 engages, so that neither a rotation about the longitudinal axis 38 still a movement parallel to this is possible. The first contact surface 72 lies in this in the 2 and 5 illustrated connection position of the rasp 10 at the second contact surface 24 flat on.

The first coupling member 66 forms a distal end of a flat, cuboid push and pull member 92 , which in a unilaterally open, cuboid recess 94 of the distal shaft portion 56 parallel to the longitudinal axis 90 is slidably mounted. So that the first coupling member 66 into the recess 36 can be moved in, starting from the recess 94 an opening 95 formed, which in interlocking coupling elements 32 and 34 directly to the free space 84 connects when the second coupling member 68 into the recess 36 protrudes, as for example in the 4 and 5 is shown. The push and pull link 92 with two spaced slots 96 provided, whose longitudinal axes parallel to the longitudinal axis 90 run. In the oblong holes 96 is guided in each case a bearing pin 98 which the recess 94 transverse to the longitudinal direction 90 interspersed. The bearing pins 98 together form a stop device 100 from each and a discount of the same, which is a movement of the push and pull member 92 limited in the distal direction and in the proximal direction.

In the transition region between the proximal shaft portion 58 and the distal shaft portion 56 is a release / lock lever 102 around one transverse to the longitudinal axes 60 and 62 extending pivot axis 104 pivoted. The release / lock lever 102 is designed in the form of a toggle lever, which has a short lever arm 106 and a long lever arm 108 defined, which are substantially transverse to each other and to the pivot axis 104 are oriented. The long lever arm 108 of the release / lock lever 102 has a length which is about half the length of the proximal sheep tabschnitts 58 equivalent. At the short lever arm 106 is another slot 110 provided, through which a in a proximal end region of the push and pull member 92 arranged bearing pin 112 extends. The bearing pin 112 is in the slot 110 forcibly guided, so that the push and pull member 92 relative to the release / lock lever 102 can perform a superimposed rotational / translational movement. The short lever arm 106 is altogether so short that it is independent of a position of the release / lock lever 102 not over outer surfaces of the shaft 54 protrudes.

As already indicated, defines the longitudinal axis 90 a displacement direction in which the first coupling member 66 is displaceable, with the longitudinal axis 90 relative to the longitudinal axis 38 around a displacement angle 114 is inclined. This is slightly smaller than the Aufleitleitwinkel 78 and is in the embodiment shown in the figures about 22 °.

An outer surface of the release / lock lever 102 is with a plurality of mutually parallel and transverse to the longitudinal axis 62 oriented flat transverse grooves 116 Mistake. At the proximal shaft section 58 is a shallow depression 118 formed, in which the release / locking lever 102 is substantially completely immersed in the locking position, so that with the transverse grooves 116 provided side surface of the release / locking lever 102 a part of an outer surface of the shaft 54 Are defined.

The rasp handle 12 also has a locking device 120 on to lock the rasp handle 12 in the connection position. This is achieved in that the locking device 120 is designed to lock the release / lock lever 102 at the grater handle 12 in the connection position.

A part of the locking device 120 forms a transverse projection 122 , which is one of the shaft 54 facing inner surface 124 of the release / lock lever 102 in the area of its proximal end 126 perpendicularly protrudes and a free end 128 having. At the cross projection 122 is an opening 130 formed, which defines a longitudinal axis which is parallel to one of the long lever arm 108 defined longitudinal axis is oriented. Is the release / lock lever 102 to the shaft 54 swung up and dives into the depression 118 a, extends the longitudinal axis of the opening 130 parallel to the longitudinal axis 62 , So the release / lock lever 102 at all in the depression 118 can dip is on the shaft 54 one transverse to the longitudinal axis 62 running aperture 132 provided, which is dimensioned so that the transverse projection 122 can swing into it.

In the from the depression 118 pointing away side surface 134 of the proximal shaft portion 58 is another recess 136 formed in which a securing member 138 parallel to the longitudinal axis 62 is held displaceable. The fuse link 138 each includes a cylinder section on the proximal and distal sides 144 that have the same diameter. They become distal and proximal of the opening 132 in the recess 136 guided, which is the distal side of the opening 132 through two pins 142 , on the proximal side of the opening 132 through three pins 142 is secured, whose longitudinal axes transverse to the longitudinal axis 62 are oriented. Through the pins 142 is the security member 138 longitudinally displaceable, that is parallel to the longitudinal axis 62 in the recess 136 held.

To the proximal-side cylinder section 144 closes in from the recess 136 over the side surface 134 protruding actuator 144 in the form of a flat cuboid projection. Between the actuator 144 and the distal-side cylinder portion 140 extends another cylinder section 146 whose diameter is about half the diameter of the cylinder sections 140 , The diameter of the cylinder section 146 is slightly smaller than a minimum width of an insertion slot 148 of the cross projection 122 , The insertion slot 148 opens the opening 130 laterally so that the cylinder section 146 whose diameter is also smaller than the diameter of the opening 130 , through the insertion slot 148 in the opening 130 can be introduced.

The fuse link 138 further comprises a securing projection 150 , which is directly distal to the actuator 144 connects and the cylinder section 146 partially surrounds. The security advantage 150 has one for breakthrough 130 corresponding diameter, so that it form-fitting in the opening 130 can dive. The security advantage 150 also has a sliding surface 152 on which the cylinder section 146 annularly surrounding and with respect to the longitudinal axis of the cylinder portion 146 inclined by about 45 ° so that it is distally as well as towards the transverse projection 122 points. The end 128 of the cross projection 122 is also bevelled and defined on both sides of the insertion slot 148 two additional sliding surfaces 154 that with the sliding surface 152 interact when the cross projection 122 in the opening 132 is introduced and with the securing member 138 comes into contact. As a result of slipping on the sliding surfaces 152 and 154 together, the fuse link 138 forcibly moved in the proximal direction. At a proximal end surface 156 the proximal-side cylinder portion 140 supports a coil spring 158 whose other end is at a distally facing inner side surface 160 the recess 136 is applied. The coil spring 158 forms a return device and serves to the securing member 138 resiliently biased to hold in a normal position. In the basic position is an end face pointing in the distal direction 162 the distal-side cylinder portion 140 on one to the side surface 160 parallel side surface 164 which points in the proximal direction.

In 2 is the rasp handle 12 shown in the locked position. The security advantage 150 engages in the opening 130 one. Will the actuator 144 in the direction of the arrow 166 shifted in the proximal direction, gives the safety projection 150 the opening 130 free. The displacement of the securing member 138 in the proximal direction is only against the action of the coil spring 158 possible. Also as a result of slipping on the sliding surfaces 152 and 154 becomes the coil spring 158 compressed. Will the actuator 144 let go, pushes the coil spring 158 the securing member 138 automatically return to the basic position.

In the release position, the in 3 is shown, the release / lock lever 102 in the direction of the arrow 168 from the shaft 54 around the pivot axis 104 be pivoted outward away. This has the consequence that the both sides of the push and pull member projecting bearing pins 98 be moved in the proximal direction. However, this is also the first coupling member 66 and that's about as far as the end 50 not or only insignificantly over the first contact surface 72 protrudes distally, moved in the proximal direction.

To connect the rapeseed handle 12 with the rasp body 14 becomes the rasp handle 12 initially transferred to the release position. Then the pin can 74 into the recess 36 be introduced until the contact surfaces 72 and 24 lie flat against each other. By pivoting the release / locking lever 102 into the depression 118 into, becomes the first coupling member 66 in the room 84 then moved in and then locked by a total positive and positive connection between the coupling elements 32 and 34 the rasp handle 12 with the rasp body 14 , The connection position is secured by the locking device 120 , which the release / lock lever 102 holds in the connecting position and at the same time in the locking position.

To the rasp body 14 in the desired way in the medullary canal 20 is to strike, is at a proximal end of the proximal shaft portion 58 a striker 170 arranged, which in the proximal direction facing, slightly convex curved face 172 having. With a hammer can be so simple and safe power strokes by hitting the hammer on the clubface 172 on the rasp 10 be transferred to the medullary cavity 20 to prepare as desired a cavity for the implantation of a prosthetic shaft.

Is the medullary cavity 20 so prepared that the rasp body 14 assumes the desired position of the prosthetic stem to be implanted, the rasp handle 12 again in a simple way from the grater body 14 be solved, by transferring the rasp handle 12 from the connecting position to the release position, wherein first the locking device 120 should be transferred from the locking position to the release position. Optional can the rasp body 14 be connected to a probing head to select, especially in a modular prosthesis system, the optimal matching prosthesis parts, for example, by trial and error.

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

• - EP 0744917 B1 [0004, 0004]

Claims (40)

Surgical rasping handle ( 12 ) for detachable connection to a rasp body ( 14 ) by means of a coupling mechanism ( 30 ) for forming a surgical rasp ( 10 ), whereby the rasp handle ( 12 ) a first contact surface ( 72 ), which in a connecting position, in which the rasp body ( 14 ) and the rasp handle ( 12 ) are connected to each other at a second contact surface ( 24 ) of the rasp body ( 14 ) is applied, wherein the rasp handle ( 12 ) a first coupling element ( 32 ) is formed or arranged, which forms part of the coupling mechanism ( 30 ) and in the connecting position with a second, on the rasp body ( 14 ) formed or arranged coupling element ( 34 ) is non-positively and / or positively or substantially non-positively and / or positively engageable engageable, characterized in that the first coupling element ( 32 ) at least two relatively movable coupling members ( 66 . 68 ), that the first coupling member ( 66 ) for transferring the rasp ( 10 ) from a release position, in which the rasp handle ( 12 ) and the rasp body ( 14 ) are separated or loosely connected to each other, can be brought into the connecting position by a movement in the distal direction in the from the second coupling member ( 68 ) in the release position unfilled space ( 84 ) one of the second coupling element ( 34 ) forming recess ( 36 ) is movable into it. Surgical rasp handle according to claim 1, characterized in that the first coupling member ( 66 ) displaceable on the rasp handle ( 12 ) is stored. Surgical rasp handle according to claim 2, characterized in that a displacement direction ( 90 ), in which the first coupling member ( 66 ) is displaceable relative to a gefläche relative to the first or second Anla ( 72 . 24 ) perpendicular surface normals ( 38 ) by a displacement angle ( 114 ) is inclined. Surgical rasping handle according to claim 3, characterized in that the displacement angle ( 114 ) has a value in a range of 1 ° to 80 °. Surgical rasping handle according to claim 4, characterized in that the displacement angle ( 114 ) has a value in a range of 10 ° to 50 °. Surgical rasping handle according to one of the preceding claims, characterized in that the first ( 72 ) and the second ( 24 ) Contact surface are flat or substantially planar and / or structured. Surgical rasp handle according to one of the preceding claims, characterized in that the second coupling member ( 68 ) a sliding surface ( 76 ) for the first coupling member ( 66 ) defines such that the first coupling member ( 66 ) when transferring the rasp ( 10 ) from the release position into the connection position on the sliding surface ( 76 ) can slip on. Surgical rasping handle according to claim 7, characterized in that the sliding surface ( 76 ) a sliding surface angle ( 78 ) relative to the surface normal ( 38 ) the first ( 72 ) or second ( 24 ) Contact surface and that the sliding surface angle ( 78 ) is equal to or greater than the displacement angle ( 114 ). Surgical rasping handle according to claim 8, characterized in that the sliding surface angle ( 78 ) has a value in a range of 5 ° to 85 °. Surgical rasping handle according to claim 9, characterized in that the sliding surface angle ( 78 ) has a value in a range of 15 ° to 55 °. Surgical rasp handle according to one of the preceding claims, characterized in that the second coupling member ( 68 ) immovable on the grater handle ( 12 ) is arranged. Surgical rasp handle according to one of the preceding claims, characterized in that the second coupling member ( 68 ) movable on the grater handle ( 12 ) is stored. Surgical rasping handle according to one of the preceding claims, characterized in that a distal end ( 50 ) of the first coupling member ( 66 ) a first coupling portion ( 86 ) whose cross-section starting from the distal end ( 50 ) increases continuously. Surgical rasping handle according to one of the preceding claims, characterized in that the first ( 72 ) and the second ( 24 ) Contact surface levels ( 26 ) which are transverse or substantially transverse to longitudinal axes ( 38 . 60 ) of the rasp handle ( 12 ) and / or the rasp body ( 14 ). Surgical rasping handle according to one of the preceding claims, characterized by a part of the coupling mechanism ( 30 ) forming release / locking levers ( 102 ), which is mounted pivotably and / or displaceably and directly or indirectly with the first coupling member ( 66 ) is coupled. Surgical rasp handle after one of the vo according to the preceding claims, characterized in that the first coupling member ( 66 ) distally on a push and pull member ( 92 ) is arranged or formed. A surgical rasp handle according to claim 16, characterized in that the push and pull member ( 92 ) parallel to the direction of displacement ( 90 ) on the grater handle ( 12 ) is slidably mounted. Surgical rasping handle according to one of the preceding claims, characterized in that a stop device ( 100 ) is provided for limiting a movement of the first coupling member ( 66 ) in the distal and / or proximal direction. Surgical rasp handle according to one of claims 16 to 18, characterized in that the push and pull member ( 92 ) movable with the release / lock lever ( 102 ) is coupled. Surgical rasping handle according to one of the preceding claims, characterized by a locking device ( 120 ) for locking the rasp handle ( 12 ) in the connection position. Surgical rasping handle according to claim 20, characterized in that the locking device ( 120 ) is formed for locking the release / locking lever ( 102 ) on the grater handle ( 12 ) in the connection position. A surgical rasp handle according to claim 20 or 21, characterized in that the locking device ( 120 ) at least one securing member ( 138 ), which in the release position with the release / locking lever ( 102 ) and in a locking position with the release / lock lever ( 102 ) is engaged. A surgical rasp handle according to any one of claims 20 to 22, characterized in that the locking device ( 120 ) Can be brought in the connecting position in the locking position. Surgical rasping handle according to claim 22 or 23, characterized in that the release / locking lever ( 102 ) and the at least one securing member ( 138 ) in the locked position force and / or positively engaged. Surgical rasping handle according to one of claims 22 to 24, characterized in that the at least one securing member ( 138 ) displaceable on the rasp handle ( 12 ) is stored. Surgical rasp handle according to one of claims 22 to 25, characterized in that the at least one securing member ( 138 ) parallel or substantially parallel to one of the rasp handle ( 12 ) defined longitudinal axis ( 62 ) is movable. A surgical rasp handle according to any one of claims 22 to 26, characterized in that the at least one securing member ( 138 ) assumes the locking position in a basic position. A surgical rasp handle according to claim 27, characterized in that the at least one securing member ( 138 ) is held compulsorily in the basic position. A surgical rasp handle according to claim 27 or 28, characterized in that the at least one securing member ( 138 ) is held resiliently biased in the basic position. A surgical rasp handle according to any one of claims 27 to 29, characterized in that the at least one securing member ( 138 ) by a reset device ( 158 ) is held in the basic position. A surgical rasp handle according to any one of claims 27 to 30, characterized in that the at least one securing member ( 138 ) a first securing projection ( 150 ) or a first Sicherungsausneh tion, which in the locked position with a corresponding second Sicherungsausnehmung ( 130 ) or a corresponding second securing projection of the release / locking lever ( 102 ) is engaged. A surgical rasp handle according to any one of claims 27 to 31, characterized in that the at least one securing member ( 138 ) at least one operating section ( 144 ), which over an outer contour of the rasp handle ( 12 ) protrudes. Surgical rasp handle according to one of claims 15 to 32, characterized in that the release / locking lever ( 102 ) in the locking position a part of an outer contour of the rasp handle ( 12 ). Surgical rasping handle according to one of claims 15 to 33, characterized in that the release / locking lever ( 102 ) in the form or substantially in the form of a toggle lever ( 102 ) is formed, with which a in an operating part ( 108 ) introduced locking force for transmission to the first coupling member ( 66 ) is amplifiable. Surgical rasp handle according to one of the preceding claims, characterized in that at a proximal end of the rasp handle ( 12 ) a striking surface pointing in the proximal direction che ( 172 ) is trained. Surgical rasp ( 10 ) with a rasp body ( 14 ), a rasp handle ( 12 ) and a clutch mechanism ( 30 ) for releasably connecting the rasp body ( 14 ) and the rasp handle ( 12 ), whereby the rasp handle ( 12 ) a first and the rasp bodies ( 14 ) a second contact surface ( 24 ), which in a connecting position, in which the rasp body ( 14 ) and the rasp handle ( 12 ) are in contact with each other, which coupling mechanism ( 30 ) a first, on the rasp handle ( 12 ) arranged or formed coupling element ( 32 ) and a second, on the grater body ( 14 ) formed or arranged coupling element ( 34 ), which in the connecting position non-positively and / or positively or substantially non-positively and / or positively interlock, characterized in that the first coupling element ( 32 ) at least two relatively movable coupling members ( 66 . 68 ), that the second coupling element ( 34 ) in the form of a starting from the second bearing surface ( 24 ) in the rasp body ( 14 ) extending recess ( 36 ) is formed and that the first coupling member ( 66 ) for transferring the rasp ( 10 ) from a release position in which the rasp handle ( 12 ) and the rasp body ( 14 ) are separated or loosely connected to each other in the connecting position in the distal direction in the second coupling member ( 68 ) in the release position unfilled space ( 84 ) of the recess ( 36 ) is movable into it. Surgical rasp according to claim 36, characterized by a rasp handle ( 12 ) according to one of claims 2 to 35. Surgical rasp according to claim 36 or 37, characterized in that the second bearing surface ( 24 ) in the proximal or substantially proximal direction and the recess ( 36 ) surrounds annularly. Surgical rasp according to one of claims 36 to 38, characterized in that the rasp ( 10 ) in the form of a hip prosthesis rasp ( 10 ) is trained. Surgical rasp according to one of claims 36 to 39, characterized in that two or more are connected to the rasp handle ( 12 ) detachably connectable, differently shaped rasp bodies ( 14 ) are provided for forming a surgical rasp set.