CN216797664U

CN216797664U - Medical X-ray apparatus

Info

Publication number: CN216797664U
Application number: CN202121450356.7U
Authority: CN
Inventors: Z.帕维尔; N.谢勒
Original assignee: Siemens Healthineers AG
Current assignee: Siemens Medical Ag
Priority date: 2020-06-29
Filing date: 2021-06-28
Publication date: 2022-06-24
Anticipated expiration: 2031-06-28
Also published as: DE102020208032A1

Abstract

The utility model relates to a medical X-ray device having a stationary unit and a unit that can be rotated about an axis, and having a coupling device that extends along the axis and by means of which the stationary unit and the rotating unit are connected to one another, said coupling device being formed from a first coupling element assigned to the stationary unit and a second coupling element assigned to the rotating unit, wherein the first and second coupling elements are arranged coaxially with respect to the axis, and having a supply cable that is guided at the coupling device from the stationary unit to the rotating unit by means of a cable guide unit in such a way that a first section of the supply cable is guided at least partially on a circular or helical track along the first coupling element about the axis and a second section is guided at least partially on a circular or helical track along the second coupling element about the axis, wherein the two sections are arranged in connection by a recurved portion of the cable.

Description

Medical X-ray apparatus

Technical Field

The utility model relates to a medical X-ray apparatus having a stationary unit and a unit which is rotatable about an axis. The X-ray device further comprises a coupling device extending along the axis, by means of which the stationary unit and the rotating unit are connected to one another, wherein the coupling device is formed by a first coupling element associated with the stationary unit and a second coupling element associated with the rotating unit, and wherein the first coupling element and the second coupling element are arranged coaxially with respect to the axis, and the medical X-ray device comprises a supply cable, wherein the supply cable is guided at the coupling device from the stationary unit to the rotating unit by means of a cable guide in such a way that a first section of the supply cable is guided at least partially on a circular or helical track along the first coupling element about the axis and a second section is guided at least partially on a circular or helical track along the second coupling element about the axis, wherein the two sections are arranged in connection by a recurved portion of the supply cable.

Background

Known medical X-ray apparatuses, for example mobile or stationary systems with holding devices, are capable of recording two-dimensional projection images and also of generating three-dimensional, CT-like image data records. The holding device, usually a C-arm (C-Bogen), is arranged on a base frame or a device cart in a movable and, in particular, rotatable manner and has an X-ray detector and an X-ray source. In order to generate a 3D volume image, the holding device or the C-arm is rotated around the examination object over a range of at least ± 180 °, better still ± 225 ° (corresponding to 225 ° in both directions, i.e. a total of 450 °) or more, and projection images are respectively taken here from a plurality of projection directions. The generated 2D projection images can then be reconstructed into a 3D volume image.

In order to provide, for example, the X-ray detector, the X-ray source and other components of the C-arm of such an X-ray system with current, data and cooling water, one or more cables have to be guided from the stationary component of the X-ray apparatus to the rotatable holding means. The cable or the individual cables bundled together to form the supply cable are subjected to high torsional loads when the rotatable component rotates. Furthermore, in the known cable arrangements, a minimum base length of the cable must be present in order to ensure a rotation of ± 225 °, for example. A base length of at least about 630mm is generally required for a supply cable wound around the axis of rotation with a cable diameter of, for example, 15 mm. For arrangements in which the feed cable is rotated about its own axis in a cylinder, the cylinder needs to be at least 430mm in length and (for a cable diameter of 15 mm) the base length of the feed cable must be at least 450 mm.

It must generally be ensured that the holding device can be rotated at least 225 ° without the supply cable affecting the clinical environment and without the supply cable itself becoming jammed or damaged. It is also advantageous if the supply cable has a base length which is as small as possible.

SUMMERY OF THE UTILITY MODEL

The object of the utility model is to provide an X-ray system having a stationary unit and a rotatable holding device, which ensures a rotation over at least ± 225 ° without adverse effects, with the shortest possible supply cables.

According to the utility model, the object is achieved by a medical X-ray apparatus having a stationary unit and a unit that is rotatable about an axis.

The utility model comprises a medical X-ray device having a stationary unit and a unit that can be rotated about an axis, and having a coupling device (or coupling) extending along the axis, by means of which the stationary unit and the rotating unit are connected to one another, wherein the coupling device is formed by a first coupling element assigned to the stationary unit and a second coupling element assigned to the rotating unit, and wherein the first and second coupling elements are arranged coaxially with respect to the axis, and having a supply cable, wherein the supply cable is guided at the coupling device from the stationary unit to the rotating unit by means of a cable guide unit in such a way that a first section of the supply cable is guided at least partially on a circular or helical path along the first coupling element about the axis, and the second section is guided at least partially on a circular or helical track along the second coupling element about an axis, wherein the two sections are arranged in a connecting manner via a cable return (gegenbiegong). The two circular or spiral tracks can have the same diameter or different diameters, the center of the circular or spiral track always forming the axis about which the second coupling element and the rotating unit can also rotate. The two sections typically form less than 360 °, for example 180 ° ± 90 °, of the circular track.

By means of the cable guide unit and the arrangement, the supply cable is also not twisted or jammed and therefore also not damaged when the rotatable unit is rotated, for example, by ± 225 °. This increases the service life of the supply cable and the entire medical X-ray apparatus and thus reduces costs due to maintenance and replacement. The X-ray device is thus also safer and less prone to malfunctions. Further, the necessary length of the supply cable can be reduced by arranging the cable guide unit.

According to one embodiment of the utility model, when the rotating unit rotates, the two sections are each variable in length, while the total length of the first and second sections together is constant. This means that if the first section becomes longer, the second section becomes shorter by the same amount at the same time. This is achieved by the slip (or movement) of the recurved part when the rotating unit is rotating. In this way, the total length of the supply cable required in the region of the coupling is always constant and no loose cable loops are produced which could jam. In order to keep the overall length constant, fastening points are also arranged at the ends of the two sections remote from the return, which fastening points connect the first section with the first coupling element and the second section with the second coupling element, for example.

According to a further embodiment of the utility model, the first coupling element and the second coupling element are arranged at least partially concentrically. The coupling elements may thus, for example, be ring-shaped or disc-shaped or tubular or cylindrical with different diameters, and one of the coupling elements may be at least partially or completely inserted into the other coupling element (for example, a disc with a smaller diameter is inserted into a ring with a larger outer diameter, or a cylinder with a smaller diameter is inserted into a tube with a larger diameter).

According to a further embodiment of the utility model, the recurved portion has a recurved radius which extends in the radial or axial direction of the axis. The radial extension is advantageous when the two coupling elements are arranged largely concentrically. In this case, the first section can be guided along a first circular track having a first diameter and the second section can be guided along a second circular track having a second diameter different from the first diameter. The axial extension is advantageous when two coupling elements are arranged, for example, predominantly side by side along the axis. The first diameter and the second diameter may be equal here.

According to a further embodiment of the utility model, the coupling device is designed in the form of a (gear) planetary gear set (or planetary gear set) having an inner sun gear and an outer ring gear concentric to the sun gear (or ring gear), and the first section of the cable is guided along an outer radius of the sun gear and the second section is guided along an inner radius of the ring gear, wherein a planetary gear is provided between the sun gear and the ring gear for stabilizing the cable in a recurved manner. A planetary gear is a gear that moves between the teeth of an inner sun gear and an outer ring gear. When the rotating unit and the associated coupling element rotate, the planet gears move between the sun gear and the ring gear and thus the return bends move together with the planet gears. All the advantages of the system are better achieved by the planet gear stabilizing the recurved part. A completely stable cable guide is ensured even with very rapid rotation, which is not limiting and eliminates the possibility of twisting of the supply cable. The system is very flexible and can be adapted to all possible (e.g. different radii) supply cables.

According to one embodiment of the utility model, the second coupling element is designed as a ring gear and the first coupling element as a sun gear. In this way, the rotating unit is located on the outside in the region of the coupling and does not move within. However, an opposite arrangement is also possible, in which the second coupling element is designed as a sun gear and the first coupling element as a ring gear.

According to a further embodiment of the utility model, the stationary unit is formed by a movable equipment cart and the rotatable unit is formed by a C-arm with the X-ray source and the X-ray detector held thereon. This is, for example, a mobile (or mobile) C-arm X-ray system. Stationary units are to be understood in connection therewith as non-rotating units, but not necessarily as immobile units.

Drawings

The utility model and further advantageous embodiments of the features according to the dependent claims are explained in detail below with reference to exemplary embodiments shown in the drawings, without thereby limiting the utility model to the exemplary embodiments. In the drawings:

fig. 1 shows a movable C-arm X-ray apparatus with a first coupling between a stationary unit and a rotatable unit;

FIG. 2 shows a view of the first coupling device according to FIG. 1 with a cable guide structure;

fig. 3 shows a view of three different angular positions of the first coupling device according to fig. 2;

FIG. 4 shows a view of the relationship of the lengths of the first coupling device according to FIG. 2;

fig. 5 shows a view of a movable C-arm X-ray apparatus with a second coupling between a stationary unit and a rotatable unit;

FIG. 6 shows a view of the second coupling device according to FIG. 5 with a cable guide structure;

fig. 7 shows a cut-away view of the second coupling device according to fig. 6;

FIG. 8 shows a layout of an exemplary first coupling device without a cable guide structure; and is

Fig. 9 shows a design of an exemplary second coupling device without a cable guide structure.

Detailed Description

Fig. 1 and 5 show a movable C-arm X-ray device 1 with a coupling according to the utility model, a first coupling KE1 (fig. 1) and a second coupling KE2 (fig. 5), respectively. The C-arm X-ray device 1 has a device cart 5 which can be moved on rollers and which carries a holding device in the form of a C-arm 2 with an X-ray detector 3 and an X-ray source 4. The C-arm 2 is connected to the utility vehicle 5 via a carrying arm T carrying the coupling K, which can also be height-adjustable. The C-arm itself is rotatable about axis a. The couplings KE1, KE2 connect the stationary unit, in this case the equipment cart 5, with the rotatable unit, in this case the C-arm 2. The coupling device is designed in such a way that it has a first coupling element S assigned to the stationary unit and a second coupling element R assigned to the rotatable unit, and the two coupling elements are arranged coaxially with respect to the axis a. For the purpose of illustrating the spatial arrangement, a coordinate system with three coordinate axes, namely an x-axis, a y-axis and a z-axis, is drawn, wherein the axis a extends along the z-axis.

Fig. 1 shows a first coupling device KE1 in which the coupling elements S are present; r are completely or at least partially concentric with each other, wherein the first coupling element S is ring-shaped and arranged within the ring-shaped second coupling element R. The first coupling element S has a smaller (outer) diameter than the second coupling element R. The axial dimension of the coupling element may (but need not) be small. Whereas in the second coupling device KE2 shown in fig. 5, two coupling elements S; r are arranged side by side, completely or at least for the most part, along the axis a, for example with substantially the same (outer) diameter.

In the prior art, the supply cable is, for example, freely guided around the coupling and is subjected to rotational loads during rotation and can be damaged or jammed. In the coupling according to the utility model, the first coupling KE1 and the second coupling KE2, the supply cable V is arranged in such a way that no damage occurs and, in addition, the basic length of the supply cable can be significantly reduced compared to the prior art.

Fig. 2 shows the first coupling device KE1 according to fig. 1 in a plan view looking into the plane formed by the x-axis and the y-axis, with a dynamic cable guide for the supply cable V. In addition to the first and second coupling elements S, R, a supply cable V is shown which is divided into a first section AB1 and a second section AB 2. The (rotation) axis a is perpendicular to the plane formed by the x-axis and the y-axis. In this plan view, it can be seen that the first coupling element S is arranged according to the form of a sun gear and the second coupling element R is arranged according to the form of a ring gear. The first section AB1 of the supply cable V is guided on a part-circular track along the outer radius of the first coupling element S and the second section AB2 of the supply cable V is guided on a part-circular track along the inner radius of the second coupling element R, wherein said first and second sections AB1, AB2 are connected by a radially extending recurve G. The planet gears P are arranged between the first section AB1 and the second section AB2 in order to guide the supply cable V and to keep it in its position along the outer radius of the first coupling element S or the inner radius of the second coupling element R. Furthermore, there are fixing points F, on which the supply cable is fixed and along which the supply cable cannot slide, so that the overall length of the supply cable in the region of the coupling device KE according to the utility model remains the same at all times. For the purpose of illustrating an exemplary design, a view of the first coupling KE1 without the supply cable is shown in fig. 8. The first coupling element S is designed as a sun gear, the second coupling element R as a ring gear, the first and second coupling elements and the planet gears P being toothed gears with teeth which cooperate with one another. The recurved part can be stabilized, for example, by means of an annular cantilever 6 fixed to the planet gear P, which recurved part is arranged around the cantilever.

Fig. 3 shows in three stages how the supply cable V behaves when the rotatable unit is rotated clockwise here and thus the second coupling element R is rotated clockwise here. Since the first coupling element S does not rotate, the fixing point F located there remains fixed in space, while the fixing point F located on the second coupling element R moves clockwise along the inner radius of the second coupling element R. The second length 12 of the second section AB2 is thereby made shorter, since a portion of the second section first transitions into the negative curve and then winds onto the outer radius of the first coupling element, i.e. adds to the first length 11 of the first section AB1, which becomes longer. The respective current recurved portion G is likewise guided clockwise by the planet gear P and stabilized. Whereas the sum of the first length 11 and the second length 12 is constant. The first length 11 of the first section AB1 and the second length 12 of the second section AB2 are each variable in length, while the sum of the first length 11 and the second length 12 remains constant, as a result of the sliding movement of the return bend G (see fig. 4). On the contrary, i.e. counterclockwise movement, the supply cable V correspondingly unwinds from the outer radius of the first coupling element and winds onto the inner radius of the second coupling element, wherein the first length 11 of the first section AB1 becomes shorter and the second length 12 of the second section AB2 becomes longer.

In one example of calculation, the dimensional relationships can be implemented here as follows: in order to ensure an unimpeded rotation of ± 225 °, i.e. 225 ° clockwise and 225 ° counterclockwise (a total of 450 °) when the diameter of the feed cable V is 15mm, it is advantageous if the transmission ratio is 0.625 (i-z)_{Driven member}/z_Active(ii) a z corresponds to the number of teeth of the gear), the outer diameter DR of the second coupling element R is 366mm and the axial extension B of the second coupling element R is at least 39 mm. Numerous other implementations are equally possible.

Fig. 6 and 7 (cut-away view) show the second coupling KE2 with the cable guide according to fig. 5, in which the coupling element S is located; r are arranged side by side, completely or at least for the most part, along the axis a, for example having substantially the same outer diameter. Here, a small overlap or a connecting element for holding the two coupling elements together is possible. Fig. 7 shows, by way of example, that the first coupling element S has a U-shaped profile, while the second coupling element R is annular and has a T-shaped profile. The first section AB1 of the supply cable V is guided in the interior of the U-profile of the first coupling element S and the second section AB2 of the supply cable V is guided externally along the webs of the T-profile of the second coupling element R, wherein the first section AB1 and the second section AB2 are connected by a return bend G. The recurved portion G extends respectively in the axial direction (z-axis) from the first coupling element S to the second coupling element R. Wheels (not shown) for stabilization may also be provided here. Fig. 9 shows a view of the second coupling KE2 without the supply cable to illustrate an exemplary embodiment. The first coupling element S has a recess (or opening) in this case, so that it is not a closed ring but only forms part of the ring. The recess can be used, for example, for fastening to a device vehicle and/or as a bushing for a supply cable. In one example of a calculation, the dimensional relationships may be implemented as follows: in order to ensure a rotation of ± 225 ° (450 °) when the diameter of the supply cable V is 15mm, it is advantageous if the clearance of the first coupling element S is at most 100 °, the outer diameter of the first and second coupling elements S, R is approximately 322mm and the common axial extension of the two coupling elements is at least 126 mm.

The coupling device modified according to the utility model makes it possible to relieve the load on the supply cable, since the supply cable can no longer twist or become jammed. The service life of the supply cable is thereby increased, the required installation and maintenance effort is lower and the costs can thereby be reduced. Furthermore, the length of the supply cable can be additionally reduced. The coupling device modified according to the utility model is particularly small, compact and highly flexible and can be easily adapted to different types of supply cables. Multiple supply cables may also be used.

The utility model can be briefly summarized in the following manner: the utility model relates to a medical X-ray device having a stationary unit and a unit that can be rotated about an axis (A), and having a coupling device that extends along the axis and by means of which the stationary unit and the rotating unit are connected to one another, wherein the coupling device is formed by a first coupling element assigned to the stationary unit and a second coupling element assigned to the rotating unit, and wherein the first coupling element and the second coupling element are arranged coaxially with respect to the axis, and having a supply cable, wherein the supply cable is guided at the coupling device from the stationary unit to the rotating unit by means of a cable guide unit in such a way that a first section of the supply cable is guided at least partially on a circular or helical track along the first coupling element about the axis and a second section is guided at least partially on a circular or helical track along the second coupling element about the axis A guide, wherein the two sections are arranged in connection by a recurved portion of the cable.

Claims

1. A medical X-ray device having a stationary unit and a unit which is rotatable about an axis (A), and having a coupling device (KE 1; KE2) which extends along the axis and by means of which the stationary unit and the rotating unit are connected to one another, wherein the coupling device is formed by a first coupling element (S) which is assigned to the stationary unit and a second coupling element (R) which is assigned to the rotating unit, and wherein the first coupling element (S) and the second coupling element (R) are arranged coaxially with respect to the axis (A), and having a supply cable (V), wherein the supply cable (V) is guided at the coupling device (KE 1; KE2) from the stationary unit to the rotating unit by means of a cable guide structure in such a way that a first section (AB1) of the supply cable (V) follows the first coupling structure at least partially on a circular or helical path The connecting element (S) is guided around the axis (A) and the second section (AB2) is guided at least partially on a circular or helical track along the second coupling element (R) around the axis (A), wherein the first section (AB1) and the second section (AB2) are arranged in a connecting manner by a return bend (G) of the supply cable (V).

2. Medical X-ray apparatus according to claim 1, characterized in that the first section (AB1) and the second section (AB2) are respectively length-variable while the total length (l1+ l2) of the sum of the first section (AB1) and the second section (AB2) remains constant while the rotating part rotates.

3. Medical X-ray device according to claim 1 or 2, characterized in that the first coupling element (S) and the second coupling element (R) are at least partially concentric.

4. Medical X-ray apparatus according to claim 1 or 2, characterized in that the recurved portion (G) has a recurved radius extending in a radial or axial direction of the axis.

5. Medical X-ray apparatus according to claim 1 or 2, characterized in that the coupling device is designed according to the form of a planetary gear transmission having an inner sun gear and an outer ring gear concentric with the sun gear, and in that a first section of the feed cable is guided along the outer radius of the sun gear and a second section is guided along the inner radius of the ring gear, and in that a planetary gear is provided between the sun gear and the ring gear for stabilizing the recurved portion (G) of the feed cable.

6. Medical X-ray apparatus according to claim 5, characterized in that the second coupling element (R) is designed as a ring gear and the first coupling element (S) is designed as a sun gear, or conversely the second coupling element (R) is designed as a sun gear and the first coupling element (S) is designed as a ring gear.

7. Medical X-ray apparatus according to claim 1 or 2, characterized in that the stationary unit is constituted by a movable apparatus cart (5) and the rotating unit is constituted by a C-arm (2) with an X-ray source (4) and an X-ray detector (3) held thereon.