DE202009006971U1 - Holding device for fixing objects on a support rail of a surgical table - Google Patents

Abstract

Holding device for fixing objects on a support rail of a surgical table with two clampable in a clamping position to the support rail and the holding while clamped to the retaining rail jaws, characterized in that the clamping jaws (16, 21) in the clamping position by an elastic energy storage (29 ) permanently clamped on the support rail (5) and that a release device (31) is provided which, when activated, the two jaws (6, 21) against the action of the elastic force accumulator (29) moves relative to each other, thereby canceling the clamping action, so in that the holding device (6) is displaceable along the holding rail (5).

Description

The The invention relates to a holding device for fixing objects a retaining rail of a surgical table with two in a clamping position attachable to the support rail and the holding device while clamping Clamping jaws which can be fixed to the retaining rail.

such Holding devices are used to attach to an operating table equipment and position instruments. It is important that normally the base of the operating table is non-sterile and sterile towels is covered while the area above the drapes is sterile. conventional Clamping devices, which are operated for example by means of clamping screws, are usually in the sterile area below the sterile ones drapes arranged while held on the holding device parts through the cloths protrude into the sterile area. To establish such holding devices Therefore, an additional person is usually needed at the operating table in the non-sterile area, the clamping device confirmed, while in the sterile area only positioned the devices and instruments held on the holding device become.

This is awkward and limits the applicability of the holding device, in particular its adjustability while an operation, clearly.

It The object of the invention is to design a generic holding device in such a way that that their handling is improved, in particular with regard to on handling in the sterile field.

These Task is at a holding device of the type described above Type according to the invention thereby solved, that the jaws in the clamping position by an elastic Force accumulator permanently clamped against the retaining rail and that a release device is provided, which activates the two jaws against the Effect of the elastic force accumulator moves into a release position and thereby the clamping effect is canceled, so that the holding device along the Retaining rail is displaceable.

The Holding device is thus in the non-activated state of the release device permanently clamped to the retaining rail, and this can happen before of the operation. By activating the release device, however, the Displacement of the holding device relative to the retaining rail be prepared, and this operation of the release device can be done from the sterile area. It is therefore not necessary at an adjustment by a second operator, the clamping the holding device to solve the retaining rail, but this can be sterile Range simply by pressing the release device respectively.

Of the elastic energy storage can be in particular a spring.

Especially It is advantageous if the release device hydraulically or pneumatically actuated. It is sufficient then, in principle, a push of a button to activate the release device and thus the displaceability of the holding device relative to the Make retaining rail.

at a preferred embodiment is provided that a jaw fixed to the holding device is arranged and the other ge compared to the fixed jaws movable and that the release device acting on the movable jaws.

Especially For example, the movable jaw can pivot relative to the fixed jaw be.

at a particularly preferred embodiment it is provided that the release device at least a jaw of the clamping position along a movement path in moves the release position and that the displaceable jaw has a contact surface, which rests in the clamping position on the support rail and the relative inclined to the trajectory, leaving its distance from the retaining rail during the movement from the release position decreases in the clamping position. By this configuration, the acts contact surface like a wedge, holding the retaining rail against the other jaw presses and thereby causes the clamping action. In particular, the inclination can the contact surface across from the trajectory be relatively low, for example, this can Inclination between 1 ° and 50 °, especially between 3 ° and 40 °. This leads to, that forces to move the jaw can be kept relatively small, anyway be generated by the wedge effect very high clamping forces, the holding device in securely fix the clamping position to the retaining rail.

Especially at small angles it enters a self-locking, which leads to a Reinforcement of clamping forces leads. You get So in this way a self-reinforcing clamping action of the jaws.

Especially It is advantageous if in a pivotable about a rotation axis Jaws the distance of the contact surface on the support rail of the axis of rotation decreases continuously.

For example it can be provided that the contact surface is a plane opposite to a tangent to the circular Movement path of the jaw is inclined.

at a particularly preferred embodiment is provided that the pivotable jaws formed L-shaped is with a bearing leg pivotally mounted at one end, a transversely projecting transverse leg and with a in the direction of the bearing leg extending contact surface to rest on the support rail.

It is advantageous when the spring is received in one of the jaws is and at the other jaws the jaws in the clamping position moving supports.

According to one preferred embodiment the release device a pneumatically or hydraulically actuated piston, which when activated against a jaw is moved, applies to this and this in the release position emotional.

at a preferred embodiment of the holding device is provided that this is a case which is relative to the others Parts of the holding device is rotatable about an axis of rotation. Thereby is an adjustment of the held on the holding device instruments and devices relative to the retaining rail possible.

Especially can be the axis of rotation in the plane of the bearing surface of the operating table and across to the longitudinal direction the retaining rail run.

It is cheap, if the case when pivoting about the axis of rotation in different angular positions relative to the rest Parts of the holding device can be locked.

Especially can be provided that the release device unlocks the permanently locked latch when activated. In the normal state so the lock is locked, so no Swiveling the housing across from the rest Share the holding device possible is, when pressed the release device However, the displacement of the holding device along the Retaining rail allows Also, the locking of the housing is unlocked, so in addition to Displacement of the housing also a pivoting of the housing relative to the rest Share the holding device possible becomes.

Especially can for locking the housing and the rest Parts of the holding device may be provided with two interlocking sprockets, which interlock for locking and unlocking each other are removable.

The following description of preferred embodiments of the invention used in conjunction with the drawings for further explanation. Show it:

1 FIG. 2 is a partial perspective view of an operating table with a holding rail attached thereto and holding means fixed thereto, in which apparatus and instruments held on the holding means have been omitted for clarity; FIG.

2 : A perspective view of the holding device of 1 ;

3 a perspective view along the line 3-3 in 2 cut holding device;

4 a sectional view of the holding device of 2 along line 4-4 in 2 ;

5 a sectional view of the holding device of 2 along line 3-3 with the jaws in clamping position;

6 Fig. 3: a sectional view of the holding device similar 5 with the jaws in release position;

7 : a schematic representation of a pivotable jaw in the clamping position and in the release position and

8th : A perspective view of the holding device of 2 without housing seen from the back.

In 1 is the storage area 1 a surgical table partially shown on a longitudinal edge of this storage area 1 is a parallel to this longitudinal edge extending, rectangular in cross-section rail 2 arranged over the cover to a sterile cloth 3 is laid. In 1 is from the cloth 3 shown only a narrow strip, in fact, this cloth extends over the entire length of the bearing surface 1 and covers the rail 2 completely off.

At the rail 2 is an encompassing holder 4 fixed, with the interposition of the cloth 3 so that this holder 4 located in the sterile area of the operating room. Along the rail 2 are at least two such holder 4 set these holders 4 carry one in parallel to the rail 2 and at a distance extending, rectangular in cross-section support rail 5 that is completely in the sterile area.

On this holding rail 5 is a holding device 6 set on the of the storage area 1 opposite side of the retaining rail 5 protrudes from this and at the required for the operation of instruments, devices and other devices can be determined. This determination is made for example via a tubular support 7 , which is up from the holding device 6 projects. This carrier 7 is only in 4 indicated, omitted in all other drawings, however, for clarity. On this carrier, the instruments and equipment to be positioned can be attached via suitable clamping devices.

The holding device 6 includes a cylindrical housing 8th , which on its upper side has a circular base 9 contributes to the connection with the carrier 7 serves. At the bottom is the case 8th a pipe socket 10 on, in the manner not shown in the drawing, a supply line for a flowable medium can be connected, for example, it may be compressed air.

The longitudinal axis of the cylindrical housing extends in the plane of the bearing surface 1 , ie horizontal, and perpendicular to the support rail 5 , the interior is to the retaining rail 5 open on the opposite side surrounds a radially inwardly projecting annular shoulder 11 a central opening 12 of the housing 8th , In this opening 12 is a completely closing lid 13 inserted, one of the interior of the cylindrical housing 8th centrally enforcing hub 14 wears on the support rail 5 facing side of the housing 8th protrudes ( 4 ). This hub 14 forms together with the cylindrical housing 8th one the hub 14 surrounding, to the retaining rail 5 open annulus 15 out.

On the free end of the hub 14 is a first jaw 16 screwed on, with its rear end in the annulus 15 dips in and with its front end out of the case 8th protrudes. This extends the jaws 16 essentially in the upper part of the housing 8th He is against a level 17 at the hub 14 created and thus permanently and firmly with the hub 14 connected. The jaws 16 has a transverse to the longitudinal axis of the housing 8th running and with the face 18 the hub 14 aligned vertical contact surface 18 on, to which a parallel to the longitudinal axis of the housing 8th extending horizontal contact surface 19 connects, in turn, in an oblique to the longitudinal axis of the housing 8th running, down from the vertical contact surface 18 removing sloping contact surface 20 passes. All these contact surfaces are flat surfaces. The distance of the inclined contact surface 20 from the vertical contact surface 18 is chosen so that this distance is close to the horizontal contact surface 19 smaller than the width of the retaining rail 5 , and that this distance is at the bottom of the sloping contact surface 20 greater than the width of the retaining rail 5 so that the retaining rail 5 when resting against the vertical contact surface 18 and the end face of the hub 14 in the middle area of the inclined contact surface 20 abuts when the jaws 16 from above onto the retaining rail 5 is put on.

At the one with the hub 14 firmly connected and thus fixed jaws 16 is a second jaw 21 mounted pivotably about an axis of rotation, transverse to the longitudinal axis of the hub 14 and runs above this longitudinal axis, the storage is thereby via a bearing shaft 22 produced. This swivel jaws 21 is essentially L-shaped with a vertical bearing leg 23 , which at one end by means of the bearing shaft 22 swiveling on the jaws 16 is mounted and at the other end a perpendicularly projecting transverse leg 24 wearing. At the free end of this cross leg 24 is an upward transverse to the longitudinal direction of the transverse leg 24 projecting lead 25 arranged, which has a sloping clamping surface 26 has, which the bearing leg 23 facing and their distance from the bearing leg to the free end of the projection 25 increases. This clamping surface 26 is a flat surface whose distance from that through the bearing shaft 22 defined axis of rotation from the lower end of the clamping surface 26 to the free end of the projection 25 decreases. The inclination against the in the pivoting of the jaw 21 circular-arc trajectory 27 ( 7 ) of this clamping surface 26 is low, the angle between the clamping surface 26 and this circular trajectory 27 is on the order of between 1 ° and 50 °, preferably 3 ° and 40 °, so that the clamping surface 26 at a pivoting of the jaw 21 opposite the lower, the storage area 1 facing edge 28 the retaining rail 5 only slightly approaches or away from this. The dimensioning is chosen so that when moving apart of the two jaws 16 and 21 the clamping surface 26 to the lower edge 28 the retaining rail 5 applies and by the decreasing distance of the clamping surface 26 to the through the bearing shaft 22 defined axis of rotation increasingly the retaining rail 5 against the vertical contact surface 18 and the sloping contact surface 20 of the jaw 16 pushes until the retaining rail 5 is firmly clamped between these investment and clamping surfaces, so that thereby the entire holding device 6 on the retaining rail 5 is clamped.

Conversely, a pivoting of the jaw leads 21 towards the fixed jaws 16 to a removal of the clamping surface 26 from the bottom edge 28 so that the clamping action is lifted and the holding Facility 6 along the retaining rail 5 becomes displaceable.

The swivel jaws 21 is in the area of its bearing legs 23 , the transverse leg 24 and the lead 25 fork-shaped, that is bearing legs 23 , Transverse leg 24 and lead 25 Form two adjacent tines on either side of the hub 14 are arranged. In the sectional views of 3 such as 5 and 6 is the section through one of the two prongs out in a plane that is arranged off-center.

The two jaws 16 and 21 be through two coil springs 29 Dodged apart in a receiving chamber 30 of the fixed jaw 16 are arranged and each at a tine of the transverse leg 24 of the jaw 21 support. These are relatively strong coil springs 29 , due to their spring action, cause the two jaws 16 and 21 from both sides with great force on the support rail 5 and sandwich them between them, as in 5 is shown. It is a steady state due to the force of the coil spring 29 is maintained.

To solve the clamping effect is in the housing 8th a the hub 14 surrounding piston 31 stored. This one has the hub 14 tightly surrounding guide sleeve 32 on and one at the rear end of the guide sleeve 32 arranged, radially projecting annular flange 33 , The guide sleeve 32 is from a plate spring 34 surrounded on the one hand at the rear end of the fixed jaw 16 supported and on the other hand to the annular flange 33 so that the piston 31 under the action of the diaphragm spring 34 with its ring flange 33 against the lid 13 the hub 14 is moved.

The space between the ring flange 33 , the lid 13 and the ring shoulder 11 of the housing 8th forms a chamber 35 which is sealed off from the environment. These are in corresponding circumferential grooves 56 . 57 . 58 the hub 14 , the ring flange 33 and the lid 13 Ring seals inserted, each opposite the guide sleeve 32 or the ring shoulder 11 caulk. In this chamber 35 opens a supply line 36 one from the top of the pedestal 9 to the chamber 35 through the pedestal 9 through ( 4 ).

The interior of the pipe socket connected to a hydraulic or pneumatic supply system 10 stands with a circumferential groove 37 in connection, in the inner wall of the housing 8th runs and to the interior of the housing 8th is open. This circumferential groove 37 is on both sides through in parallel to the circumferential groove 37 extending circumferential grooves 38 . 39 inserted ring seals sealed, these ring seals lie against the outer wall of an annular locking element 40 which, with a cylindrical outer wall on the inner wall of the housing 8th is applied. In the area of the pedestal 9 is the circumferential groove 37 over one the pedestal 9 passing through the flow channel 41 in connection, in turn, via a closing valve shown only schematically in the drawing 42 with the supply line 36 connected is. In this way it is with the closing valve open 42 possible, the holding device supplied flowable medium, for example compressed air, in the chamber 35 to initiate and thereby the piston 31 against the action of the plate spring 34 towards the retaining rail 5 to move.

The piston 31 indicates at its the retaining rail 5 facing the end two projections 43 on, each on a bearing leg 23 of the pivotable jaw 21 abut when the piston 31 against the action of the plate spring 34 is moved. In this sliding movement so pivot the projections 43 the jaws 21 from the clamping position against the action of the coil springs 29 in the release position.

In 5 is the swivel jaws 21 shown in the clamping position, while no flowable medium is in the chamber 35 initiated and the piston 31 is through the plate spring 34 against the lid 13 pressed, ie in the retracted position. In 6 is a situation in which the chamber 35 filled with flowable medium, the piston 31 is contrary to the effect of the diaphragm spring 34 moved and pivoted while the jaws 21 against the action of the coil spring 29 in the release position.

The activation of the release device described is done solely by opening the closing valve 42 , this can be done by means of a corresponding switch on the holding device 6 , which is not shown in the drawing, take place, out of the sterile area. Only when this switch is operated, the closing valve 42 opened and thus gives the jaws 21 free. As soon as the closing valve 42 closed again, the piston is 31 pushed back into the retracted initial position, at the same time pivot the coil springs 29 the jaws 21 in the clamping position, so that the holding device 6 again safely on the retaining rail 5 is held.

It is advantageous that the clamping forces for holding the retaining rail by the substantially wedge-shaped clamping jaws 21 be generated, with its oblique contact surface 26 at the retaining rail 5 is applied. This system can be done in support rails of different dimensions in the same way, also all parts are pressed against each other during clamping of the jaw that any existing game is eliminated, so you can achieve a play-free determination on the support rail. The large holding forces are essentially from the bearing shaft 22 included, the coil springs 29 serve only to the jaws 21 to hold in the clamping position. This results in a robust and very adaptable construction, that is, the design adapts to different cross-sectional shapes and sizes of the support rail and compensates for any possible play of the individual moving parts to each other.

The housing 8th is opposite to all other parts of the holding device about the central axis of the hub 14 rotatably mounted on the remaining parts. The storage takes place once over the circular lid 13 and on the other hand over the fixed jaws 16 in his in the case 8th submerged area also has a circular cross-section.

To the case 8th to be able to set in a certain angular position relative to the other parts of the holding device, a locking device is provided. This includes a rotationally fixed to the housing 8th connected and in an annular groove 44 the ring shoulder 11 of the housing 8th used locking ring 45 on his holding rail 5 facing side over the circumference distributed a plurality of triangular in cross-section teeth 46 wearing.

This locking ring 45 acts with the locking element 40 together, which on the inner wall of the housing 8th adjacent to this is freely rotatable and also in the longitudinal direction of the housing 8th slidably stored in this. This locking element 40 gets through radially from the fixed jaws 16 protruding pins 47 in recesses 48 the locking element 40 intervene with the jaws 21 rotatably connected, but remains in the longitudinal direction of the hub 14 opposite the jaw 21 ver pushed. The locking element 40 carries on his the latching ring 45 facing end an inwardly projecting annular flange 49 as well as the locking ring 45 with a plurality of distributed over the circumference, triangular in cross-section teeth 50 is provided. These teeth 50 point towards the teeth 46 and intervene between them when the locking element 40 towards the latching ring 45 is moved.

Such a shift is effected by a coil spring 51 which the plate spring 34 on the outside surrounds and which on the one hand to the fixed jaws 16 and on the other hand on the annular flange 49 the locking element 40 supported. By shifting the coil spring 51 thus become the teeth 50 and the teeth 46 engaged, and this causes the housing 8th against a rotation relative to the hub 14 and the other parts of the holding device is locked. This lock can only be solved when the locking element 40 against the action of the coil spring 51 is moved. Such a shift is readily possible because the teeth 46 and 50 through the triangular shape form lateral sliding surfaces, so that when turning the housing 8th opposite the remaining parts of the locking element 40 by the sliding of the teeth 46 and 50 against the action of the coil spring 51 is raised. It is therefore readily possible to rotate the housing gradually relative to the other parts, at the end of the rotation are the locking element 40 and the locking ring 45 through the coil spring 51 again brought into engagement, so that a rotation can only take place when a certain torque is applied, which is the coil spring 51 deformed.

However, in order to securely lock an angular position once reached, it is additionally provided that the piston 31 when the release device is not activated, ie without the supply of fluid medium into the chamber 35 , with the outer edge 52 of the annular flange 33 on the ring flange 49 the locking element 40 abuts and the locking element 40 thereby into the latching ring 45 moves approximate position. From this position out the locking element 40 only be moved, though the piston 31 is moved into the release position, ie against the action of the plate spring 34 ,

Thus, the release device can achieve a dual effect, namely once by the displacement of the piston 31 the pivoting jaws 21 pivoted to the release position, on the other hand gives the piston 31 the locking element 40 free, then only by the coil spring 51 against the locking ring 45 is pressed, allowing a user the housing 8th can twist against the other parts.

Claims (17)

Holding device for fixing objects to a holding rail of a surgical table with two clampable in a clamping position to the support rail and the holding device while clamped on the retaining rail fixable jaws, characterized in that the jaws ( 16 . 21 ) in the clamping position by an elastic energy storage ( 29 ) permanently clamped to the retaining rail ( 5 ) and that a release device ( 31 ) is provided when activated the two jaws ( 6 . 21 ) contrary to the effect of the elastic force accumulator ( 29 ) moves relative to each other and thereby eliminates the clamping action, so that the holding device ( 6 ) along the retaining rail ( 5 ) is displaceable. Holding device according to claim 1, characterized in that the elastic energy accumulator ( 29 ) is a spring. Holding device according to claim 1 or 2, characterized in that the release device ( 31 ) is hydraulically or pneumatically actuated. Holding device according to one of the preceding claims, characterized in that a clamping jaw ( 16 ) on the holding device ( 6 ) is fixed and the other against the fixed jaws ( 16 ) and that the release device ( 31 ) on the movable jaws ( 21 ) acts. Holding device according to claim 4, characterized in that the movable clamping jaws ( 21 ) relative to the fixed jaw ( 16 ) is pivotable. Holding device according to one of the preceding claims, characterized in that the release device ( 31 ) at least one jaw ( 21 ) of the clamping position along a movement path ( 27 ) shifts into the release position and that the displaceable jaw ( 21 ) a contact surface ( 26 ), which in the clamping position on the retaining rail ( 5 ) and that relative to the trajectory ( 27 ) is inclined, so that their distance from the retaining rail ( 5 ) decreases during the movement from the release position into the clamping position. Holding device according to claim 6, characterized in that the inclination between the contact surface ( 26 ) and the trajectory ( 27 ) is between 1 ° and 50 °, preferably 3 ° and 40 °. Holding device according to claim 6 or 7, characterized in that at a pivotable about an axis of rotation clamping jaws ( 21 ) the distance of the contact point of the contact surface ( 26 ) on the retaining rail ( 5 ) from the axis of rotation ( 22 ) decreases continuously. Holding device according to claim 8, characterized in that the contact surface ( 26 ) is a plane opposite to a tangent to the circular trajectory ( 27 ) of the jaw ( 21 ) is inclined. Holding device according to one of claims 5 to 9, characterized in that the pivotable clamping jaws ( 21 ) L-shaped is formed with a pivotally mounted at one end bearing leg ( 23 ), a transversely projecting transverse leg ( 24 ) and with one in the direction of the bearing leg ( 23 ) extending contact surface ( 26 ) to rest on the retaining rail ( 5 ). Holding device according to one of claims 2 to 10, characterized in that the spring ( 29 ) in one of the jaws ( 16 ) and is attached to the other jaw ( 21 ) the jaws ( 16 . 21 ) is supported in the clamping position moving. Holding device according to one of the preceding claims, characterized in that the release device is a pneumatically or hydraulically actuated piston ( 31 ) which, when activated against a jaw ( 21 ) is moved, applies to these and this moves in the release position. Holding device according to one of the preceding claims, characterized in that it comprises a housing ( 8th ), soft relative to the remaining parts of the holding device ( 6 ) is rotatable about an axis of rotation. Holding device according to claim 13, characterized in that the axis of rotation in the plane of the bearing surface ( 1 ) of the operating table and transversely to the longitudinal direction of the retaining rail ( 5 ) runs. Holding device according to one of claims 13 or 14, characterized in that the housing ( 8th ) in a pivoting about the axis of rotation in different angular positions relative to the other parts of the holding device ( 6 ) is lockable. Holding device according to claim 15, characterized in that the release device ( 31 ) when activated, the permanently locked latch ( 40 . 45 ) unlocked. Holding device according to one of claims 15 or 16, characterized in that for locking the housing ( 8th ) and the remaining parts of the holding device ( 6 ) two interlocking sprockets ( 40 . 45 ) are provided, which interlock for locking and are removable for unlocking each other.