CN115590708A

CN115590708A - Patient support table

Info

Publication number: CN115590708A
Application number: CN202210793864.8A
Authority: CN
Inventors: 贝特霍尔德·鲍曼; 约翰尼斯·斯托克
Original assignee: Siemens Healthineers AG
Current assignee: Siemens Healthineers AG
Priority date: 2021-07-07
Filing date: 2022-07-07
Publication date: 2023-01-13
Anticipated expiration: 2042-07-07
Also published as: CN115590708B; DE102021207141B3

Abstract

The invention relates to a patient support table comprising two scissor stands (3) each having a first and a second scissor arm (4, 5) which are pivotably connected to one another in an X-shaped arrangement about a common pivot axis (6) and are pivotable relative to one another by means of a lifting device (20) for vertically displacing a support table (13) connected to the scissor stands, wherein the lifting device comprises at least one traction mechanism (23) which can be rolled up and unrolled, wherein the lower end of the two scissor arms (4, 5) of each scissor stand is arranged on a stand carrier (2), wherein the traction mechanism is fastened by means of one end (25) to a winding shaft (21) which is rotatably arranged in a positionally fixed manner on the stand carrier by means of a drive motor (22) and by means of the other end (26) to a connecting shaft (27) which connects the two scissor stands, and wherein the traction mechanism is guided by means of a plurality of pulley-set pulleys (28, 29) arranged on the connecting shaft and the winding shaft.

Description

Patient support table

Technical Field

The invention relates to a patient support table comprising two scissor stands, each having a first and a second scissor arm, which are pivotably connected to each other about a common pivot axis in an X-arrangement and can be pivoted relative to each other by means of a lifting device for vertically displacing the support table connected to the scissor stands, wherein the lifting device comprises at least one traction means that can be rolled up and unrolled, wherein the lower end of the two scissor arms of each scissor stand is arranged at a stand carrier.

Background

Such patient support tables are used in medical technology in various applications. It is used for examination and treatment purposes. A patient can be accommodated on a table, wherein the table can be varied in its height such that it can be adjusted between a lowered position allowing easy boarding and a raised examination or treatment position. For this purpose, a lifting device is used, via which two scissor-type stands can be adjusted, on which the platen is finally supported. The two scissor supports each have two scissor arms which are pivotably connected to one another in an X-shaped arrangement and which are almost folded for lowering, i.e. the X arrangement is relatively flat, and which are pulled apart for lifting, i.e. the X arrangement is set up.

Such a patient support table has two scissor-type supports arranged in parallel, each having two scissor arms, wherein the scissor-type supports move synchronously with respect to each other. The scissor-type stand is fastened with its lower end, for example, to a carrier plate or a carrier frame, wherein, for example, one arm end is fixed in position in a fixed bearing, but is pivotably mounted, while the other end is guided so as to be linearly movable via a floating bearing, wherein the arm end is also pivotably mounted. The upper arm end is connected, for example, with a table holder, at which the table plate can be releasably mounted, wherein once again one end is fixed in position and pivotable in a fixed bearing and the other end is guided linearly and pivotable via a floating bearing.

Different lifting devices are known for adjusting the height. A spindle drive is usually used, for example in the form of a ball screw or a trapezoidal screw, wherein the respective spindle and the nut running thereon are moved relative to one another and one or more elements to be lifted or lowered are coupled, for example, by means of a spindle nut which is moved along a positionally fixed spindle. On the one hand, such a spindle drive is relatively maintenance-intensive, in particular with regard to the supply of lubricant, and in addition also generates noise during operation, in particular at high loads which are to be lifted. The background noise also changes during the ascent and descent due to the lever ratio between the lower and upper ascent and descent positions. Furthermore, the operating time is limited due to the inherent friction generated within the spindle drive.

Alternatively, lifting devices with traction mechanism drives are known. The lifting of the scissor-type stand is thereby achieved via a pulling mechanism, for example a belt, which can be wound onto and unwound from a winding shaft. For this purpose, the traction means is fixed to one of the scissor-type stands by the other end. The pulling mechanism is thus extended from the winding shaft to the scissor-type stand. In order to obtain a true lifting movement, the traction means is coupled to or wound around a roller arrangement, wherein the roller arrangement is arranged between the two V-shaped open arm sections of the scissor-type stand. The function here is that when the traction means is wound up, the roller device is pressed further between the arm sections to such an extent that it is pressed away from one another for lifting. When the traction mechanism is unfolded, the roller device is again relieved of load, so that due to the weight the scissor-type stands are folded together again and the roller device is moved back again here. An example of such a traction mechanism drive is described in the publication "To design a belt drive scanner lifting table", corrado Andrew et al, international Journal of Engineering and Technology (IJET), vol.8, no.1, 2016, 2-3 months, pages 515-525. The belt is stretched from a winding shaft on the ground side, i.e. on a support carrier, via a roller arrangement to a fastening device on the side of the scissor arm, where the belt end is fastened. The arm-side fastening is provided with a multi-part and therefore complex fastening extending laterally at the arm along the arm, at which the belt end is fastened.

Disclosure of Invention

The problem on which the invention is based is that of providing a patient support table of simplified design in relation thereto.

In order to solve this problem, it is proposed according to the invention in the patient support table or support table mentioned at the outset that the traction means is fastened with one end to a winding shaft which is rotatable via a drive motor and is arranged in a stationary manner on the support carrier, and with the other end to a connecting shaft which connects the two scissor-type supports, wherein the traction means is guided via a plurality of pulley sets arranged on the connecting shaft and the winding shaft.

According to the invention, the traction means of the pulley set type is guided between its two ends, which are fastened to different structural elements, in contrast to the previously known lifting devices of patient support tables, which comprise traction means. By means of one end, the pulling means is fixed at the winding shaft, onto which and from which the pulling means can be wound and unwound. The other end is fixed at a connecting shaft connecting the two scissor supports. The connecting shaft connects the two scissor arms of the two scissor carriages, i.e. extends horizontally. The scissor carriages are each arranged on the carriage carrier movably, i.e. linearly guided, by means of at least one end, i.e. the two scissor arms can change their relative position with respect to the carriage carrier both rotationally and also translationally, which enables folding together and erection. The connecting shaft is arranged at the two scissor arms or at the scissor arm sections extending towards the ends of the translatory bearing. The second traction means end is fixed as described at the connecting shaft. According to the invention, the traction means in the form of a pulley set is looped a number of times between the winding shaft and the connecting shaft, i.e. it runs from the winding shaft to the connecting shaft, winds around the connecting shaft and runs back to the winding shaft and winds around the winding shaft and runs from the winding shaft again to the connecting shaft, where it can then be fixed in the simplest case. However, the traction means can also be guided between the connecting shaft and the winding shaft again or several times, so that a plurality of corresponding return lines are produced, the pulley block thus becoming "longer". The traction means is guided by its individual return or circulating line on the respective pulley at the winding shaft and the connecting shaft. Since if the pulling means is wound onto or unwound from the winding shaft via a rotation caused by the drive motor, the overall length of the pulling means between the winding shaft and the connecting shaft changes, i.e. a relative movement of the pulling means relative to the winding shaft and the connecting shaft is caused in the winding region, which is caused by the displacement of the position of the movable connecting shaft relative to the stationary winding shaft as described. The change in the length of the pulling means and the resulting relative movement of the pulling means relative to the winding shaft and relative to the connecting shaft are now guided via the pulleys in a friction-free manner according to the invention, i.e. no friction processes occur between the pulling means and the winding shaft and the connecting shaft during winding up and unwinding.

By guiding the traction means as a pulley block, the particular advantage is achieved that, in particular for lifting a patient support table, on which a patient is usually located, significantly less force is required, i.e. the drive motor, for example a torque motor, has to generate less torque or apply less torque to the winding shaft in order to wind up the traction means, which, as it were, also has to support less torque when descending. The more frequently the traction means circulate in the pulley block, i.e. the more traction means segments are produced, on which the weight to be lifted or lowered is distributed, the less the force required for lifting or lowering is, wherein the length of the rope to be wound up or unwound, which is required for lifting or lowering the weight the same distance, is correspondingly increased as a function of the number of circulations. The drive motor can be designed to be smaller or simpler, since it can therefore be operated with less effort, i.e. less torque must therefore be provided in terms of the drive motor. The winding speed of the shaft is slightly higher compared to a traction mechanism design without pulley blocks, but is still always in the range of few turns per minute, so that a corresponding rotational speed of the winding shaft can easily be provided via a simple drive motor.

The patient support table according to the invention therefore allows an improved lifting operation in a simple design, which can be achieved with significantly less drive power. Furthermore, a rapid lifting operation without a number of restrictions is possible by means of the traction mechanism transmission, i.e. lifting and lowering can be carried out with sufficiently high speeds, wherein the lifting and lowering speeds are dependent on the rotational speed of the winding shaft and can furthermore be set or adjusted without problems. A very precise height positioning is also possible, which is carried out by correspondingly controlling the drive motor in a sensor-supported manner. For example, a rotational speed sensor is provided at the motor, so that ultimately a rotational speed control of the drive motor results, but a position or angle sensor can also be provided as a control basis, which detects the position of the scissor arms relative to one another or the angle of the scissor arms relative to one another.

Another significant advantage is the high operational smoothness and virtually noiseless operation of the traction mechanism drive. During the lifting and lowering operation, only the winding shaft rotates, as does the pulley, wherein the rotation can be carried out almost completely without noise by corresponding mounting of the winding shaft and the pulley on the winding shaft and the connecting shaft via corresponding rolling bearings and optionally also sliding bearings. Furthermore, the support is also extremely durable. Since the respective roller is only subjected to a relatively small angle of rotation and its rotational speed is extremely low, the corresponding rolling or sliding bearing can also be designed relatively simply.

The traction means can be a rope, for example a steel rope or a rope made of plastic fibers, for example aramid fibers. It is also contemplated to use a narrow belt.

In a further development of the invention, it can be provided that one lower end of the scissor arms of the scissor stand is supported in a linearly displaceable and pivotable manner on the stand carrier via a linear guide, while the other lower end is supported in a stationary and pivotable manner on the stand carrier, wherein the connecting shaft is arranged in the region of the end supported via the linear guide. The two scissor supports are therefore supported by the end of one scissor arm in a fixed bearing at the support carrier, i.e. cannot be moved in translation, but rather are only pivotally supported, in order to be able to fold together and set up the scissor supports. While the lower end of the other scissor arm is mounted in a floating bearing, i.e. is movable in translation, so that the end of the floating bearing can be moved in the direction of and away from the end of the fixed bearing. Here too, a pivot bearing is provided in order to be able to fold together and set up. The connecting shaft connecting the two scissor-type stands is now arranged in the region of the end supported via the linear guide and therefore also in the vicinity of the stand carrier. The winding shaft is also supported on the carrier, i.e. also in a position close to the carrier. This ultimately leads to the traction means also extending correspondingly close to the stand carrier, i.e. therefore close to the ground, which in turn leads to the remaining structural space between the scissor stands being freed and available for integrating other required components. The arrangement of the connecting shaft in the region of the end of the floating bearing is also advantageous in terms of force, since a longer lever is thereby obtained at the two scissor arms from the joint of the connecting shaft to the pivot axis via which the two scissor arms are connected to one another in a pivotally movable manner approximately in the middle of the length of the scissor arms. The longer the lever, the less force that should be exerted on the whole for lifting.

The connecting shaft preferably extends in a common pivot axis of the lower ends of the two scissor arms, which are mounted via the linear guide. That is to say, the connecting shaft is arranged directly at the floating bearing of the scissor arm. The connecting shaft is a rigid shaft which does not rotate during operation. The design can be such that the connecting shaft is arranged fixedly at two loose bearings, in which the scissor arms are rotatably mounted via corresponding rolling bearings and a common pivot axis, wherein the connecting shaft extends exclusively in the common pivot axis. It is also conceivable that the connecting shaft itself serves as a bearing for a rolling bearing which is integrated into the floating bearing and on which the scissor arms are mounted. Different variants with regard to the arrangement of the connecting shaft are therefore conceivable here.

If, alternatively, the connecting shaft can be arranged in the common pivot axis in a manner extending at the floating bearing, the winding shaft can also extend in the common pivot axis of the lower end of the scissor arm which is arranged in a stationary manner. That is to say, the winding shafts are also arranged in a common pivot axis formed at the fixed bearing, but are of course independently rotatably supported via corresponding rolling bearings.

If the winding shaft and the connecting shaft are arranged in a corresponding common pivot axis, they are therefore positioned very close to the carrier, i.e. they can hardly be arranged deeper. This in turn causes the traction mechanism to extend very close to the carrier, i.e. close to the ground.

Preferably, the centers of the connecting shaft and the winding shaft are in a common horizontal plane in the installation position, which then in turn causes the traction means to be guided horizontally.

As described, the pulley is preferably mounted on the connecting shaft and the winding shaft by means of rolling or sliding bearings. Via the bearing, preferably a rolling bearing, the traction means can be guided with little noise.

As well as the lower end, the upper ends of the two support arms can be mounted in the same manner, fixed on one side and floating on the other side. The upper ends of the two support arms are preferably connected to a gantry for supporting the table, wherein one upper end of each scissor-type stand is linearly displaceably and pivotably supported at the linear guide via a floating bearing at the gantry, while the other upper end is arranged in a positionally fixed and pivotable manner at the gantry via a fixed bearing, wherein at least one support mechanism is provided which connects the two scissor arms of at least one scissor-type stand and supports a lifting movement in at least one direction. The scissor-type stand is connected to a gantry which forms an interface for a support table releasably fixed thereto, so that a change of the support table to another support table specific to the planned application or a transfer of the patient together with the support table can also be effected. The two fixed bearings of the scissor-type stand are of course vertically stacked on top of each other, as are the two floating bearings. A unilateral translatory scissor-like carriage movement thus occurs in the region of the carriage carrier and the gantry.

In this case, it has proven to be advantageous if, in order to additionally support the lifting movement in at least one direction, a support means is provided which connects the two scissor arms of at least one scissor-type stand, wherein the support means is expediently arranged in the region of the upper scissor end when the pulling means has been extended in the region of the lower scissor end. The support mechanism can further optimize the lifting operation. Such a support means can be, for example, a telescopic cylinder with an integrated spring, which is operated hydraulically or by means of gas. In addition to being arranged in the region of the upper end of the scissor-type stand, it is naturally also conceivable for the support means, i.e. for example a telescopic cylinder, to be arranged also in the region of the lower end. This is possible in particular if the pulling means is not guided over the entire width between the two scissor supports, but rather only, for example, in half, in a pulley block, so that sufficient space for the arrangement of the support means or the telescopic cylinder is still available on the underside.

In particular, the supporting mechanism is preferably designed or arranged such that it supports a lifting movement for lowering the lifted scissor-type stand. It is sometimes desirable to lower the table without the patient lying on the table. That is, the weight that should be reduced is not so high. In order to avoid slippage during the guiding of the traction means due to a reduced traction means tension, which is then possible, a sufficient traction means tension is maintained via the support means, i.e. for example a telescopic cylinder, so that an optimized traction means operation is still possible even in the event of a load reduction drop. Thus, if a telescopic cylinder is used, it continuously presses the two connected scissor ends away from each other. When setting up, i.e. when lifting the table, the telescopic cylinders are pushed together, i.e. a restoring force is built up, which causes the cylinders to expand again later when lowering, via which the traction means tension can be maintained.

It is sufficient that only one scissor stand is provided with such a support mechanism with a telescopic cylinder, which, as described, can connect the two upper ends or the two lower ends. Since the two scissor supports are supported via the fixed and floating bearings, the provision of only one support means at only one scissor support is not problematic. Alternatively, it is of course also possible to provide a corresponding support or telescopic cylinder at each scissor stand.

The support means are also expediently arranged pivotably at both scissor arms of the scissor-type stand, since of course a relative pivoting movement of the scissor arms with respect to the change in position can also be carried out. Preferably, the support means, i.e. the telescopic cylinder, is also mounted in a corresponding pivot axis of the upper or lower end of the scissor arm.

The support means is preferably a telescopic cylinder with an integrated spring as described above. In this case, a very simple telescopic cylinder is provided, which is not controllable, since it is ultimately only to be designed as a telescopic cylinder which provides an adjusting force in one direction, if it is intended, for example, to support only a lowering movement.

Drawings

Further advantages and details of the invention emerge from the exemplary embodiments described below and from the figures. Shown here are:

fig. 1 shows a schematic representation of a patient support table according to the invention in a side view, an

Fig. 2 shows a cross-sectional view along the line II-II in fig. 1.

Detailed Description

Fig. 1 shows a schematic representation of a patient support table 1 according to the invention, comprising a frame carrier 2, at which two parallel scissor frames 3 are arranged, see also fig. 2. Each scissor stand 3 is formed by a first scissor arm 4 and a second scissor arm 5, which are pivotably connected to each other about a common pivot axis 6 in an X-shaped arrangement. The two scissor supports 3 are each pivotable via a fixed bearing 7 about a first pivot axis 8 illustrated in fig. 2, wherein the two pivot axes 8 form a common pivot axis. The fixed bearing 7 is arranged at the lower end of the first scissor arm 4.

The lower end of the further second scissor-arm 5 is linearly displaceable, i.e. a translatory movement is possible on a linear guide 10 of the stand carrier 2 via a floating bearing 9, as indicated by the double arrow P1, in the range of which the floating bearing 9 can be moved closer to or further away from the fixed bearing 7. At the same time, each lower end of the scissor arms 5 is also pivotally supported about a pivot axis 11, which in turn forms a common pivot axis. When the floating bearing is moved away from the fixed bearing, the scissor-type mounts 3 are also lowered or moved together with the movement of the floating bearing, or lifted when the floating bearing 9 is moved in the direction of the fixed bearing 7.

A table 12 is connected to the upper ends of the scissor arms 4,5, on which table a table 13, which in the example shown is only schematically shown, on which a patient 14 can lie, is preferably releasably arranged. The upper ends of the scissor arms 4,5 are also supported in a similar manner. The upper end of the scissor arm 5 is supported at the gantry 12 about a pivot axis 16 in a fixed bearing 15. The upper end of the scissor arm 4 is mounted in translation on a linear guide 18 of the gantry 12 via a corresponding floating bearing 17, as indicated by the double arrow P2. A pivot bearing about the pivot axis 19 is also provided in addition.

For raising and lowering the platform 13, a lifting device 20 is provided, which comprises a winding shaft 21, which extends, as shown in fig. 1 and 2, in the common pivot axis 8 of the two lower fixed bearings 7. The winding shaft 21 is mounted in rotation via a separate roller bearing and can be driven in rotation via a drive motor 22, which is in each case only shown in principle. The drive motor 22 can be, for example, a torque motor, which is based on sensor indications.

A pulling means 23 in the form of a rope 24 is fixed with one end 25 at the winding shaft 21. The other end of the rope 24 is fixed at the connecting shaft 27. The connecting shaft 27 connects the two scissor supports 3 between the two floating bearings 9, wherein the connecting shaft is likewise arranged in the common pivot axis 11, similar to the winding shaft 21. The connecting shaft 27 can be a rigid shaft which therefore does not rotate on its own, that is to say, does not require a separate bearing. The winding shaft 21 is mounted in rotation relative thereto via suitable rolling bearings, as described, but of course also the scissor arms 4,5 are mounted in a pivoting manner in the fixed and floating

bearings

7, 9 or 15, 17 via corresponding rolling bearings.

As shown in the drawing, the pulley block type rope 24 is wound around the winding shaft 21 and the connecting shaft 27 in multiple. For this purpose, a plurality of individual pulleys 28 are provided at the winding shaft 21 and a plurality of individual pulleys 29 are provided at the connecting shaft 27, which are each rotatably mounted individually at the winding shaft 21 or at the connecting shaft 27 via a rolling

bearing

30, 31. The cable 24 is guided via the

pulleys

28, 29, which is wound around the

pulleys

28, 29, so that a pulley-like arrangement results overall. The stretching of the belt 24 is shown schematically in this side view, since the belt 24 actually stretches between the two scissor-type mounts 3 and is therefore not visible in the side view. The belt can run adjacent to one of the scissor-type stands 3 or else can run centrally between the scissor-type stands 3.

The centers of the winding shaft 21 and the connecting shaft 27 preferably lie in a common horizontal plane, so that the rope 24 also runs horizontally, as shown in particular in fig. 1.

If in operation the winding shaft is rotated, for example, clockwise via the drive motor 22, so that the cable 24 is wound up, the cable length between the winding shaft 21 and the connecting shaft 27 is forcibly shortened as the wound-up length increases, so that the connecting shaft 27 is moved in the direction of the winding shaft 21, i.e. the floating bearing 9 is moved in the direction of the fixed bearing 7. This causes the raising of the scissor-type stand 3 and thus the lifting of the table 13. If, conversely, the wound-up cable 24 is unwound by a counterclockwise rotation of the winding shaft 21, the cable 24 is again extended and the respective cable length between the winding shaft 21 and the connecting shaft 27 is extended, so that the connecting shaft 27 is again moved away from the winding shaft 21, which is caused by the load resting on the scissor-stand 3, which is formed at least by the weight of the table 12 and the table plate 13, but if necessary also by the weight of the patient 14.

By integrating the pulley arrangements, i.e. correspondingly guiding the cable 24 in the manner of a pulley arrangement, the force required in particular to be applied for erecting is constantly decreasing as the number of turns of the individual integrated rollers increases. It follows that the torque to be applied at the drive motor 22 also becomes smaller and smaller, or the required drive power is constantly reduced, so that it is possible to operate with a drive motor 22 which is of relatively simpler or lower design.

The figure is only a schematic view, i.e. the number of rope turns can also be chosen differently. It is conceivable that only one

pulley

28, 29 should be provided at the connecting shaft 27 and the winding shaft 21, respectively, which results in a smaller reduction of the required force or drive power, or that still

more pulleys

28, 29 are provided, which results in a further reduction. As the number of pulleys and thus rope turns increases, the length of rope that should be reeled up or unwound also increases in order to achieve a similar hoisting or lowering as in devices with a smaller number of pulleys.

Since on the one hand the traction mechanism drive is used and on the other hand the

pulleys

28, 29 are roller-guided via

roller bearings

30, 31, a very smooth, but at the same time also rapid and in particular almost noiseless lifting operation is possible since there is hardly any friction and even the integrated, rotating component to which the winding shaft 21 also belongs is a roller bearing.

As shown in fig. 1, a support mechanism 32 can optionally be provided which supports the lifting movement indicated generally via arrow P3, said support mechanism being shown here in the form of a telescopic cylinder 33. The telescopic cylinder 33 comprises a cylinder 34 and a spring 35 integrated therein as well as a rod 36 which can be removed from the cylinder 34. The telescopic cylinder 34 is arranged with one end in the region of the fixed bearing 15 and is pivotable there about the common pivot axis 16. The other end of the telescopic cylinder 33, in this case the rod 36, is arranged at the floating bearing 27 and there in the common pivot shaft 19. That is, the scissor arms 4,5 are also pivotable relative to the telescopic cylinder 33.

The function of the telescopic cylinder 33 is that the spring 35 continuously pushes the rod 36 out of the cylinder 34, that is to say the upper ends of the scissor arms 6, 5 are continuously pressed apart from one another. When setting up, i.e. when the upper ends of the scissor arms 4,5 are moved towards each other, the rod 36 moves into the cylinder 34, wherein the spring 35 is pressed together. If the table 13 is now to be lowered, the spring 15 pushes the rod 36 out of the cylinder 34, i.e. the telescopic cylinder 33 lengthens and in this case presses the scissor arms 4,5 positively against one another. If now, for example, no patient lies on the support table 13, the weight resting on the scissor-type stand 3 is not too high, which corresponds only to the sum of the weights of the table 12 and the table plate 13. If the winding shaft 21 now winds up the rope 24, a reduction in rope tension can occur due to the low weight, which can lead to slipping if the rope tension is too low. After the telescopic cylinder 33 has actively pressed the scissor arms 4,5 away from each other and thus also the lower end of the guide rope 24 there away from each other, this is avoided via the support mechanism 32, so that the rope tension is maintained.

In the exemplary embodiment, only one support means 32 is provided at the scissor-type stand 3. This is sufficient after the scissor carriages are very stably supported via the fixed and floating

bearings

7, 15 or 9, 17 and furthermore the two scissor carriages 3 are arranged at the common carriage carrier 2 and are connected to one another on the upper side via the gantry 12. That is, no overturning moment or torsional moment is induced which would have a negative effect in any way. However, in individual cases it is also appropriate to provide a telescopic cylinder 33 at each of the two scissor-type stands 3.

Finally, such a telescopic cylinder 33 can however also be arranged close to the ground, i.e. adjacent to the rack carrier 2. As shown in fig. 2, the cable 24 can initially be stretched in the region of the scissor-type mounts 3, i.e. it is not guided between two scissor-type mounts 3 over the entire width. In this case, as shown in fig. 2, there is now sufficient space for the telescopic cylinder 33 to be arranged in the region of the lower end of the scissor-type stand 3 shown on the right in fig. 2.

Although the invention has been illustrated and described in detail with respect to preferred embodiments thereof, the application is not limited by the disclosed examples and other modifications can be derived therefrom by those skilled in the art without departing from the scope of the invention.

Claims

1. A patient support table (1) comprising two scissor stands (3), the scissor stands (3) having a first and a second scissor arm (4, 5), respectively, which first and second scissor arms (4,5) are pivotably connected to each other about a common pivot axis (6) in an X-shaped arrangement and are pivotable relative to each other by means of a lifting device (20) for vertically moving a support table (13) connected to the scissor stands (3), wherein the lifting device (20) comprises at least one traction mechanism (23) that can be rolled up and unrolled, wherein the lower end of the two scissor arms (4, 5) of each scissor stand (3) is arranged at a stand carrier (2),

it is characterized in that the preparation method is characterized in that,

the traction means (23) is fastened by one end (25) to a winding shaft (21) which is rotatable by means of a drive motor (22) and is arranged in a stationary manner on the support carrier (2), and by the other end (26) to a connecting shaft (27) which connects the two scissor supports (3), wherein the traction means (23) is guided by means of a plurality of pulleys (28, 29) arranged on the connecting shaft (27) and on the winding shaft (21).

2. A patient support table according to claim 1,

one lower end of a respective scissors arm (4, 5) of a scissors-type stand (3) is linearly movably and pivotably supported at the stand carrier (2) via a linear guide (10), while the other lower end is fixedly and pivotably supported at the stand carrier (2), wherein the connecting shaft (27) is arranged in the region of the end supported via the linear guide (10).

3. A patient support table according to claim 2,

the connecting shaft (27) extends in a common pivot axis (11) of the lower ends of the two scissor arms (4, 5) supported via the linear guide (10).

4. A patient support table according to any preceding claim,

the winding shafts (21) extend in a common pivot axis (8) of the lower end which is arranged in a stationary manner.

5. A patient support table according to claim 4,

the centers of the connecting shaft (27) and of the winding shaft (21) lie in a common horizontal plane in the mounted position.

6. A patient support table according to any preceding claim,

the pulleys (28, 29) are mounted on the connecting shaft (27) and the winding shaft (21) by means of rolling or sliding bearings (30, 31).

7. A patient support table according to any preceding claim,

the traction mechanism (23) is a rope (24) or a belt.

8. A patient support table according to any preceding claim,

the upper ends of the two support arms (4, 5) are connected to a frame (12) for supporting a table (13), wherein one upper end of each scissor-type support (3) is linearly movably and pivotably supported on the frame (12) via a linear guide (18), while the other upper end is arranged stationary and pivotably on the frame (12).

9. A patient support table according to any preceding claim,

at least one support mechanism (32) for supporting two scissor arms (4, 5) of the at least one scissor support (3) is provided, wherein the support mechanism (32) supports a lifting movement in at least one direction.

10. A patient support table according to claim 9,

the support mechanism (32) is designed or arranged such that it supports a lifting movement for lowering the lifted scissor-type stand (3).

11. A patient support table according to claim 9 or 10,

each scissor stand (3) has a support mechanism (32).

12. A patient support table according to any of claims 9 to 11,

the support mechanism (32) connects the two scissor arms (4, 5) of the scissor-type stand (3) in the region of the upper ends of the scissor arms (4, 5).

13. A patient support table according to any of claims 9 to 12,

the support means (32) are pivotably mounted on both scissor arms (4, 5) of the scissor-type stand (3) in corresponding pivot axes (16, 19) of the upper or lower ends of the scissor arms (4, 5).

14. The patient support table of any one of claims 9 to 13,

the support mechanism (32) is a telescopic cylinder (33) with an integrated spring (35).