Femur lift of an operating table

Abstract

Femur lift (1) of an operating table (2) comprising a control device (5) for a support arm (3) mounted therein in a longitudinally adjustable position in a transverse recess (27) of an angularly pivotable control disk (6), with an end-side femur support (4) and a pivot-releasable return locking mechanism (7) made of a spring-loaded control wedge (8) which engages in a wedge gap between a functional surface (17) of the control device (5) and a convex end-face control surface (16) of the control disk (6), characterized in that the control device (5) is equipped with an adjusting device (25) which has a control slide (20) extending in front of a narrow side of the control wedge (8) and the control wedge (8) is held in a zero position out of engagement with the control surface (16),which, in an operating position with the control slide (20) moved out of contact, is engaged with the control surface (16) and allows an angular adjustment of a support arm (3) in one direction of rotation from bottom to top and locks in the opposite direction of rotation from top to bottom.

Description

[0001] The invention relates to a femur lift of an operating table comprising a control device for a support arm mounted therein in a longitudinally adjustable manner in a transverse recess of an angle-pivoting control disc, with an end-side femur support and a return pivot lock that can be released in the pivoting direction, made of a spring-loaded control wedge which engages in a wedge gap between a functional surface of the control device and a convex end-face control surface of the control disc.

[0002] A hypomochlion of an operating table is known, DE 10 2022 105 130 A1, which, like this femur lift, serves to create sufficiently large spaces for a minimally invasive procedure in a patient's joint. To support optimal positioning, such hypomochlia or femur lifts are known that generate additional pressure or leverage forces on a patient's limb where necessary, for example, to optimize the relative position of joint surfaces. While the known hypomochlion already provides a control system that is easy to use and simplifies necessary position adjustments even during surgery under load, its operation is still too complex, and its manufacture is very expensive and complicated. It also lacks an adjustable limit to the swivel angle of the support arm against the direction of support.

[0003] The object of the invention is therefore to provide a femur lift for an operating table that is far less complicated in design, easy and uncomplicated to handle, and has a limitable angular deflection of the support arm and thus of the femur support.

[0004] The solution to this problem, in conjunction with the features of the preamble, is achieved according to the invention in connection with the technical features of the characterizing part of the main claim, in that the control device is equipped with an adjusting device comprising a control slide extending in front of a narrow side of the control wedge, and the control wedge is held in a zero position out of engagement with the control surface, which, in an operating position with the control slide moved out of contact, is engaged with the control surface and then allows an angular adjustment of a support arm of a femoral support in a pivoting direction from bottom to top and locks it in the opposite direction from top to bottom. This inventive femoral lift also makes it possible, for example, in the event of a yielding of a femoral support designed as a cushion roller, to adjust the position without tools.Further pivoting of the support arm, which then immediately locks itself back into the new position, so that such a correction can be carried out quickly and easily without having to open and tighten fastening screws under load, so that optimal operating conditions can be maintained at all times, whereby to put the femur lift into operation only the control slide has to be pivoted from a zero position to an operating position, which greatly simplifies the handling of the inventive femur lift.

[0005] Further advantageous embodiments of the subject matter of the invention result from and in combination with the following dependent claims.

[0006] A particularly advantageous design is that of a femur lift in which the control wedge has a shallow wedge angle between 2° and 8° and its wedge surface and the control surface of the control disc have mutual detents, which are very finely designed, thus enabling almost stepless adjustment of the femur lift. The control wedge is pre-tensioned by an elastic element in the direction of the gap between the control surface of the control disc and a flat bearing surface of the control device for the control wedge, whereby the elastic element can consist of a metallic helical spring designed as a compression spring.In an operating position, the support arm of the femur lift can be pivoted in a direction opposite to the preload force of the compression spring. The fine toothing engages accordingly, and during a pivoting movement of the control disc in the pressure direction of the elastic element, the clamping effect of the control disc on the control wedge and the functional surface of the control device is increased. This ensures that a return pivoting movement of the femur support arm is locked securely, both by force and, more importantly, by positive locking. Unintentional slippage of the control disc is thus reliably prevented.

[0007] According to a particularly preferred embodiment of the invention, the control disc is equipped on its side opposite the downwardly directed toothed concave control surface with an upper stop surface, on which a height stop of the control device adjustably engages in a transverse direction to the pivot axis of the control disc and thus adjustably limits the possible angular deflection of the support arm against its support direction.

[0008] The femur lift basically features a control mount with a protruding bolt below the pivot axis of the control disc. This bolt extends through an arc-shaped recess around the pivot axis in the control disc, thus limiting its maximum possible pivoting movement. However, the height stop allows for adjustable limitation of the control disc's angular deflection. The control disc is pivotally mounted between a control mount and a control cover. A guide plate with a slotted hole oriented transversely to the pivot axis is clamped between these components above the upper stop surface of the control disc. A clamping screw extends from above through this slot into the height stop located beneath the guide plate, which is laterally movable within the slot.

[0009] The underside of the guide plate facing the height stop, and also the side of the height stop facing it, feature mutually facing detent surfaces, which are also equipped with fine teeth. This allows the clamping screw, located in a neutral zero position above the pivot axis of the control disc, to be moved laterally across the stop surface of the control disc and locked in place, thereby reducing the possible adjustment angle as desired. The surface of the stop surface can be designed to deviate from a flat surface, either rising or falling, thus enabling a progressive or degressive adjustment of the pivot limit of the control disc.

[0010] According to an advantageous embodiment of the invention, the adjustment device is equipped with an actuating lever for the control slide, which is designed to be releasably locked in a zero position and in at least one operating position. In one embodiment, for the femur lift to be positioned on either side of an operating table, the lever is designed to be releasably locked in two operating positions around the zero position. The control device has two control wedges arranged in opposite directions with their tips facing each other. In a zero position, both of these wedges rest against the control slide, so that the control disc is freely pivotable above the pivot axis of the control disc when the star knob is released and the height stop is in a center position.

[0011] The inventive femur lift can therefore be controlled particularly easily via a single operating lever, while the mechanical design is very simple and robust, with the additional limitation of the possible angle adjustment of a support arm reliably preventing accidental overloading of a patient's femur.

[0012] An embodiment of the invention is described in more detail below with reference to the drawings. The drawings show: Fig. 1. A spatial view of an operating table with a femur lift arranged on the right side. Fig. 2 an enlarged spatial representation of the femur lift, Fig. 3 a cutaway front view of the control device of the femur lift in a further enlarged view, and Fig. 4. A spatial exploded view of the control device. Reference symbol list: 1 Femur lift 2 operating tables 3 support arm 4 Femoral support 5 Control device 6 Control disc 7. Swing-back locking mechanism 8 Steering wedge 9 compression spring 10 Base plate 11 bracket 12 operating table rails 13 Control unit 14 Control covers 15 Exclusion 16 Control surface 17 functional areas 18 wedge surface 19 elongated holes 20 control valves 21 guide pins 22 arc-shaped recesses 23 Bearing bushing 24 clamping screw 25 Adjustment device 26 Star handle 27 transverse recess 28 Exclusion 29 clamping screw 30 Guide plate 31 Swivel axis 32 slotted holes 33 lead 34 recordings 35 Height stop 36 Stop surface 37 rest area 38 Cylinder pin 39 Actuating levers 40 contact area 41 functional area

[0013] The femur lift 1 of an operating table 2, which can be arranged on either side of an operating table, essentially consists of a control device 5 for a support arm 3 which is longitudinally adjustable in a transverse recess 27 of an angle-pivoting control disc 6, is inserted therein from back to front and has a femur support 4 at its right-angled end, which here is designed as a cushion roll, as is the case in Fig. Figures 1 and 2 are also shown. Furthermore, the femur lift 1 on each side of the operating table consists of a return swivel device 7 which can be released in the swiveling direction from bottom to top and of a spring-loaded control wedge 8 which engages in a wedge gap between a functional surface 17 of the control device 5 and a convex end-face control surface 16 of the control disc 6, wherein the control device 5 is equipped with an adjustment device 25 common to both control wedges 8.

[0014] This adjusting device 25 has a control slide 20 extending from below in front of the narrow sides of the control wedges 8, which are designed as contact surfaces 40, and which has functional surfaces 41 with its contact surfaces 40 that simultaneously hold both control wedges 8 out of engagement with the control disk 6 in a zero position, as shown in Fig. 3 is shown.

[0015] In an operating position, the control slide 20 is moved laterally forward to such an extent that a functional surface 41 and a contact surface 40 on the opposite side are out of contact, and the corresponding rear control wedge 8 with its wedge surface 18 is pressed into the wedge gap. This allows for angular adjustment of a support arm 3 of a femur lift 1 from bottom to top, but locks it in the top-down position. This enables the femur support 4 of the femur lift 1 to be used as a support under the femur of a patient during an operation without being able to unintentionally yield.

[0016] The control device 5 essentially consists of a vertical base plate 10 with a clamp 11 facing the operating table rail 12 and end clamping screws 24 for clamping to the operating table rail 12. On the side opposite the clamp 11, the base plate 10 carries the control receptacle 13 of the control device 5, which, like the control cover 14 of the control device 5, also has bearing bushings 23 for rotatable pivoting of the control disk 6 between the control receptacle 13 and the cover 14. Furthermore, the control receptacle 13 is provided with a stationary horizontal guide pin 21, which extends through an arcuate recess 22 in the control disk 6, the recess 22 having a radius around the pivot axis 31 and thus mechanically limiting the maximum pivoting movement of the control disk 6.

[0017] The control device 5 is designed symmetrically for its ability to be arranged on either side of an operating table 2, and the control disc 6 advantageously has a cylindrical section-shaped control surface 16 of the control disc 6 common to both wedge surfaces 18 of the control wedges 8, which drastically simplifies the manufacture of the control disc 6 compared to the control disc known from the prior art with two separate curve lines.

[0018] The control receptacle 13 further comprises a straight, flat functional surface 17 spaced parallel to the tangent to the control surface 16. Two control wedges 8, directed in opposite directions at acute angles to each other, are arranged on this surface. Each wedge extends from both sides, from the outside inwards, into the clamping gap between the functional surface 17 and the control surface 16 of the control disk 6 by means of elastic compression springs 9, which are designed as metallic coil springs. The two control wedges 8 have a shallow wedge angle between 2° and 8°. The effective wedge surface 18 and the control surface 16 of the control disk 6 have mutual detents that engage in an operating position of the femur lift 1. Furthermore, each of the control wedges 8 has a recess 28 at its end for cylindrical pins 38 arranged in the control receptacle 13, which support the compression springs 9.

[0019] To enable external actuation of the control wedges 8, an adjusting device 25 is arranged below the control device 5. A control slide 20 extends upwards from this device through an elongated hole 19 in the control receptacle 13. In a neutral position, the tips of the control wedges 8 with their functional surfaces 40 rest against the control slide 20 in such a way that the control wedges 8 do not contact the control surface 13 or the teeth of the control disk 6. The control slide 20 can be moved forwards in the adjusting device 25 towards the head of an operating table 2 by means of an actuating lever 39. In this position, the control wedge 8 arranged in this direction is moved further out of the wedge gap against the spring force of the compression spring 9, and the opposite control wedge 8 no longer abuts the functional surface 41 of the control slide 20 but is pressed into the wedge gap by the compression spring 9.With the support arm 3 of the femur lift 1 inserted from back to front into the transverse recess 27 of the control disc 6, the femur support 4 can now be moved in a circular arc around the pivot axis 31 from bottom to top, whereby the corresponding control wedge 8 can be moved slightly in the direction of the compression spring 9, skipping the fine teeth, whereas a return pivoting movement of the support arm 3 is prevented by the teeth of the control wedge 8, since it rests on the surface 17 of the control receptacle 13 and is pressed further into the wedge gap by the teeth, thereby reinforcing the locking mechanism and forming a reliable return locking mechanism 7.

[0020] The control disc 6 is equipped on its upper side opposite the lower toothed concave control surface 16 with a stop surface 36, on which a height stop 35 of the control device 5 engages adjustableably in the transverse direction to the pivot axis 31 of the control disc 6 and adjustably limits the angular deflection of the support arm 3.

[0021] The control receptacle 13 and the control cover 14, between which the control disc 6 is pivotably arranged, have two upper horizontal receiving grooves 34 into which projections 33 of a guide plate 30 extend, which is arranged above the control disc 6 and is clamped between the control receptacle 13 and the control cover 14 and which has a horizontal elongated hole 32 through which a clamping screw 29 extends from top to bottom into the height stop 35, the elongated hole 32 being oriented transversely to the pivot axis 31 of the control disc 6, so that the height stop 35 can be positioned in a zero position centrally above the pivot axis 31 of the control disc 6 or can be moved from it in the elongated hole 32 towards the femoral support 4 and thereby rests on the stop surface 36 of the control disc 6 and can thus adjustably limit its pivot angle.The detent surface 37 of the height stop 35 facing the guide plate 30, as well as the underside of the guide plate 30, is equipped with mutual toothing, so that once an angle adjustment of the support arm 3 has been set, it can be fixed by force and form locking.

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