CN212415758U

CN212415758U - Three-axis mobile centerable CT scanning table

Info

Publication number: CN212415758U
Application number: CN202020265571.9U
Authority: CN
Inventors: 袁知东
Original assignee: Peking University Shenzhen Hospital
Current assignee: Peking University Shenzhen Hospital
Priority date: 2020-03-06
Filing date: 2020-03-06
Publication date: 2021-01-29
Anticipated expiration: 2030-03-06

Abstract

The utility model discloses a three-axis movable centerable CT scanning bed, which comprises a bed body, a guide seat, a bed board, an air pump device, a driving component and a lifting mechanism. The top of the bed body is provided with a groove; the guide seat is arranged in the groove; It is slidably connected with the guide seat and can move along the Z-axis direction of the guide seat; the air pump device is arranged in the side wall of the groove, and is used to drive the guide seat so that the guide seat can drive the bed plate to move in the X-axis direction of the bed body; drive The component is arranged at the bottom of the bed plate and is used to drive the bed plate to move along the Z-axis direction of the bed body; the lifting mechanism is arranged at the bottom of the bed body to drive the bed body to rise and fall in the Y-axis direction. In the process of CT scanning, when a certain organ of the patient needs to be accurately scanned, the organ can be moved to the isocenter position of the CT scan, and the image obtained by the centering of the scanning position is accurate and clear, with minimal artifacts, spatial resolution and density resolution. Strength is the highest.

Description

Centered CT scanning bed with three-axis movement

Technical Field

The utility model relates to the technical field of medical equipment, concretely relates to CT scanning bed placed in middle that triaxial removed.

Background

The isocenter of CT scanning is the center of the machine frame, is the central axis of the X-ray bulb tube and the detector rotating around the human body, and has the advantages of small image projection deviation, uniform X-ray distribution, and highest space, density and time resolution. Deviation of a scanning part from the central position of CT scanning and the like can cause the situations that an image cannot be completely displayed, the automatic tube current modulation technology is inaccurate due to projection deviation, the image density and noise are seriously uneven, the artifact is increased in weight, the occurrence frequency is greatly increased, and the spatial, density and time resolution are reduced.

After the scout scan, most CT machines can not carry out the operation of lifting the bed, all CT machines can not move the bed left and right, the image display area is changed by adjusting the position of the interest area to cover the whole examination part, but the imaging process is not changed. The right positioning image can only adjust the image display position deviation in the left and right directions, the side positioning image can only adjust the image display position deviation in the front and back directions, and the adjustment range is limited. The center of the region of interest may still be deviated from the scanning isocenter after adjustment, and a factor causing degradation of image quality still exists.

The optimal solution under the condition is to set a scanning interest area according to the positioning image, and then adjust the height and the left and right positions of the scanning bed according to the position of the scanning interest area so as to realize the complete coincidence of the center of the scanning interest area and the center position of CT scanning and the like, thereby ensuring the optimal image quality.

Conventional CT scanning beds can only move in the long axis (Z-axis) direction and the height (Y-axis) direction. Before scanning, a CT technician needs to manually determine the starting position (position in the Z-axis direction) and height (position in the Y-axis direction) of the scanning bed according to the purpose of examination and the condition of the patient, and move the patient to a position centered on the right and left (position in the X-axis direction). However, the positioning is performed by the CT technician based on experience and subjective knowledge, and there is a certain deviation, so that it is difficult to put the body of the patient to the central position of CT scanning due to the body, disease, clothes, bedding, and the like of some patients. The requirement for examination of cardiac coronary artery CTA, spinal artery CTA and the like is high, a certain distance is reserved between a scanning interest area and the central position of a patient body, and the optimal imaging effect cannot be achieved by a conventional mode of centering the patient body.

SUMMERY OF THE UTILITY MODEL

The invention aims to solve the technical problems of artifact generation in scanning and accurate centering of organs. Therefore, an object of the present invention is to provide a three-axis movable centered CT scanning bed, which includes:

the top of the bed body is provided with a groove;

the guide seat is arranged in the groove;

the bed plate is connected with the guide seat in a sliding mode and can move along the Z-axis direction of the guide seat;

the air pump device is arranged in the side wall of the groove and used for driving the guide seat to drive the bed plate to move in the X-axis direction of the bed body;

the driving assembly is arranged at the bottom of the bed plate and used for driving the bed plate to move along the Z-axis direction of the bed body;

and the lifting mechanism is arranged at the bottom of the bed body and is used for driving the bed body to lift in the Y-axis direction.

Preferably, according to an embodiment of the present invention, the air pump device includes a plurality of first expansion portions and second expansion portions, the first expansion portions are disposed in the left side wall of the groove, the second expansion portions are disposed in the right side wall of the groove, and the first expansion portions and the second expansion portions extend to the guide seat and are connected to each other;

when the first telescopic part extends out of the left side wall, the second telescopic part retracts into the right side wall so as to drive the guide seat and the bed board to move towards the right side wall together;

when the first telescopic part retracts into the left side wall, the second telescopic part extends out of the right side wall to drive the guide seat and the bed board to move towards the left side wall together.

Preferably, according to an embodiment of the present invention, cavities are disposed in the left side wall and the right side wall, and damping fluid is filled in the cavities, and the first telescopic portion and the second telescopic portion are used for sealing the damping fluid in the cavities;

the air pump device is communicated with the cavity and used for pressurizing or decompressing the cavity so as to extend or retract the first telescopic part and the second telescopic part.

Preferably, according to an embodiment of the present invention, the driving assembly includes a motor, a first lead screw and a push plate, a first slide rail is disposed in the groove along the Z-axis direction of the bed body, the bottom of the push plate is slidably connected to the first slide rail, the top of the push plate is connected to the bed plate, and the motor is fixedly disposed in the groove and is in transmission connection with the first lead screw;

wherein, the spout has been seted up to the guide holder just the side embedding of bed board Z axle direction in the spout, first lead screw wears to locate in the push pedal, be used for the drive the push pedal is followed the Z axle direction of first slide rail removes, just the push pedal drives the bed board is in remove in the spout.

Preferably, according to the utility model discloses an embodiment, the push pedal top has the edge two second slide rails of bed body Z axle direction parallel arrangement, the bed board bottom with two second slide rail sliding connection, so that the bed board is followed the Z axle direction of two second slide rails removes.

Preferably, according to an embodiment of the present invention, the lifting mechanism includes a retractable accommodating cover disposed at the bottom of the bed body, and a support and a driving device disposed in the accommodating cover;

the driving device is used for driving the bracket to drive the accommodating cover to ascend or descend.

Preferably, according to an embodiment of the present invention, the accommodating cover includes a movable portion and a fixed portion, the movable portion is sleeved outside the fixed portion and slidably connected to the fixed portion, and the top of the movable portion is fixedly connected to the bottom of the bed body;

the bottom of the support is hinged with the fixed part, and the top of the support is hinged with the movable part, so that the support drives the movable part and the bed body to be lifted or lowered together.

Preferably, according to an embodiment of the present invention, two guide slots are oppositely disposed in the fixing portion, and the bracket includes two sets of first connecting rods and second connecting rods disposed in a crossed manner;

the first connecting rod is provided with a first connecting fulcrum, the second connecting rod is provided with a second connecting fulcrum, and the first connecting fulcrum and the second connecting fulcrum are both arranged in the guide groove in a sliding manner;

when the first connecting fulcrum and the second connecting fulcrum approach each other, the first connecting rod and the second connecting rod are expanded to lift the movable part;

when the first connecting fulcrum and the second connecting fulcrum are away from each other, the first connecting rod and the second connecting rod are folded to lower the movable portion.

Preferably, according to the utility model discloses an embodiment, be equipped with in the fixed part and be located two backup pad between the guide slot, it is two sets of pivot is equipped with first connecting axle between the first connecting rod, and is two sets of pivot is equipped with the second connecting axle between the second connecting rod, drive arrangement connects respectively first connecting axle with the second connecting axle is in order to order about first connection fulcrum with second connection fulcrum is close to each other or keeps away from.

Preferably, according to the utility model discloses an embodiment, drive arrangement includes biax motor and two second lead screws, biax motor respectively with two the second screw drive is connected, two be provided with screw-nut on the second lead screw respectively, the screw-nut top respectively with first connecting axle and second connecting axle are connected.

The utility model provides a CT scanning bed placed in middle that triaxial removed is provided with the guide holder at bed body top, during the use, it is just right with the position of CT detector through elevating system adjustment bed board, then slide in the guide holder through drive assembly drive bed board, thereby get into the CT detector, after getting into the CT detector, the guide holder can be driven by air pump device, thereby X axle direction at bed body top recess removes, make at the CT scanning in-process, when needing accurate scanning patient's certain organ, can remove this organ to the isocenter position of CT scanning, the image that obtains in the scanning position is accurate clear, the artifact is minimum, space resolution and density resolution are all highest.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a centered CT scanning bed with three-axis movement provided in an embodiment of the present invention;

fig. 2 is an exploded view of a centered CT scanning bed with three-axis motion provided in an embodiment of the present invention;

fig. 3 is a partial sectional view of a centered CT scanning bed with three-axis motion provided in an embodiment of the present invention;

fig. 4 is a sectional view of the lifting mechanism provided in the embodiment of the present invention.

The reference numbers illustrate:

10. a bed body; 101. a groove; 102. a first slide rail; 20. a guide seat; 201. a chute; 30. a bed board; 40. a drive assembly; 401. a drive motor; 402. pushing the plate; 4021. a second slide rail; 403. a screw rod; 50. a lifting mechanism; 501. an accommodating cover; 5011. a fixed part; 5012. a movable portion; 502. a support; 5021. a guide groove; 5022. a first link; 5023. a first connection fulcrum; 5024. a first connecting shaft; 5025. a second link; 5026. a second connection fulcrum; 5027. a second connecting shaft; 503. a drive device; 5031. a double-shaft motor; 5032. a second lead screw; 60. a CT detector; 70. an air pump device; 701. a first telescopic part; 702. a second telescoping portion.

The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention, and all other embodiments obtained by those skilled in the art without creative efforts based on the embodiments of the present invention belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "circumferential", "radial", and the like, indicate the orientation or positional relationship indicated based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The three-axis movable centered CT scanning bed according to the embodiment of the present invention is described in detail below with reference to the attached drawings.

Referring to fig. 1 to 4, a centered CT scanning bed with three-axis movement provided in the embodiment of the present invention includes a bed body 10, a guide seat 20, a bed plate 30, an air pump device, a second driving plate assembly 40 and a lifting mechanism 50, wherein a groove 101 is formed at the top of the bed body 10; the guide seat 20 is arranged in the groove 101; the bed board 30 is connected with the guide seat 20 in a sliding way and can move along the Z-axis direction of the guide seat 20; the air pump device is arranged in the side wall of the groove 101 and is used for driving the guide seat 20 so that the guide seat 20 drives the bed plate 30 to move in the X-axis direction of the bed body 10; the second driving plate assembly 40 is arranged at the bottom of the bed plate 30 and used for driving the bed plate 30 to move along the Z-axis direction of the bed body 10; the lifting mechanism 50 is disposed at the bottom of the bed 10 and is used for driving the bed 10 to lift in the Y-axis direction.

The utility model provides a CT scanning bed placed in middle that triaxial removed is provided with guide holder 20 at bed body 10 top, during the use, adjust bed board 30 just right with CT detector 60's position through elevating system 50, then slide in guide holder 20 through second drive plate subassembly 40 drive bed board 30, thereby get into CT detector 60, after getting into CT detector 60, guide holder 20 can be driven by air pump device, thereby remove at the X axle direction of bed body 10 top recess 101, thereby make the patient when needs are accurate to certain organ position, the position of patient's organ can just scan CT detector 60, make the scanning position accurate clear of the image that obtains placed in the middle, the artifact is minimum, spatial resolution and density resolution are all the highest.

Specifically, the air pump device comprises a plurality of first telescopic parts 701 and second telescopic parts 702, the first telescopic parts 701 are arranged in the left side wall of the groove 101, the second telescopic parts 702 are arranged in the right side wall of the groove 101, and the first telescopic parts 701 and the second telescopic parts 702 extend to the guide seat 20 and are connected; when the first telescopic part 701 extends out from the left side wall, the second telescopic part 702 retracts into the right side wall to drive the guide seat 20 and the bed board 30 to move towards the right side wall together; when the first telescopic part 701 retracts into the left side wall, the second telescopic part 702 extends out from the right side wall to drive the guide seat 20 and the bed board 30 to move towards the left side wall.

Cavities are formed in the left side wall and the right side wall, damping liquid is filled in the cavities, and the first telescopic part 701 and the second telescopic part 702 are used for sealing the damping liquid in the cavities; an air pump device is arranged in the bed body 10 and communicated with the cavity, and the air pump device is used for pressurizing or depressurizing the cavity so as to extend or retract the first telescopic part 701 and the second telescopic part 702.

In this embodiment, when the CT detector is used, the second driving plate assembly 40 may drive the bed board 30 to enter the CT detector 60, when the position of the patient in the left-right direction of the bed board 30 needs to be adjusted, the cavity of the left side wall may be pressurized by the air pump device, and the cavity of the right side wall may be depressurized, so that the first telescopic portion 701 pushes the bed board 30 and the second telescopic portion 702 retracts into the right side wall, so that the guide seat 20 drives the bed board 30 to move towards the direction of the right side wall, generally, because the inner diameter structure of the CT detector 60 is fixed, the distance of the bed board 30 moving left and right may be finely adjusted; optionally, the air pump device may be arranged according to actual requirements, for example, the air pump device may be respectively arranged in the left side wall and the right side wall to pressurize or depressurize the air pump device, so that the air pump device may be stable and reliable in the using process.

Specifically, the second driving plate assembly 40 includes a motor 401, a first screw 403 and a push plate 402, a first slide rail 102 is disposed in the groove 101 along the Z-axis direction of the bed 10, the bottom of the push plate 402 is slidably connected to the first slide rail 102, and the top of the push plate 402 is connected to the bed plate 30, the motor 401 is fixedly disposed in the groove 101 and is in transmission connection with the first screw 403; the guide seat 20 is provided with a sliding groove 201, a side edge of the bed plate 30 in the Z-axis direction is embedded into the sliding groove 201, the first screw 403 penetrates through the push plate 402 and is used for driving the push plate 402 to move along the Z-axis direction of the first slide rail 102, and the push plate 402 drives the bed plate 30 to move in the sliding groove 201.

In this embodiment, the first screw 403 and the push plate 402 are in threaded connection, so that the screw 403 transmission is realized between the first screw 403 and the push plate 402, and the motor 401 drives the screw 403 to rotate, so as to drive the push plate 402 to slide on the first slide rail 102, so that the push plate 402 drives the bed plate 30 to move, so that the patient enters the position of the CT detector 60 to scan an image, it can be understood that the position of the CT detector 60 moved by the bed plate 30 can also be set by adopting the prior art.

Furthermore, the top of the push plate 402 is provided with two second slide rails 4021 arranged in parallel along the Z-axis direction of the bed 10, and the bottom of the bed plate 30 is slidably connected with the two second slide rails 4021, so that the bed plate 30 moves along the Z-axis direction of the two second slide rails 4021.

Wherein, guide holder 20 can drive the bed board 30 and slide at push pedal 402 top, from this, can set up two second slide rails 4021 at push pedal 402 top, and when guide holder 20 drove bed board 30 and removes, bed board 30 can slide more smoothly at push pedal 402 top, and is optional, also can set up the slide rail in guide holder 20 bottom so that it slides with being connected between the bed body 10, can make holistic removal more convenient and smooth.

Specifically, the lifting mechanism 50 comprises a retractable accommodating cover 501 arranged at the bottom of the bed body 10, and a bracket 502 and a driving device 503 which are arranged in the accommodating cover 501; the driving device 503 is used to drive the bracket 502 to lift or lower the accommodating cover 501.

Further, the accommodating cover 501 comprises a movable part 5012 and a fixed part 5011, the movable part 5012 is sleeved outside the fixed part 5011 and is slidably connected, and the top of the movable part 5012 is fixedly connected with the bottom of the bed 10; the bottom of the bracket 502 is hinged to the fixed part 5011, and the top of the bracket 502 is hinged to the movable part 5012, so that the bracket 502 drives the movable part 5012 and the bed 10 to move up or down together.

Wherein, hold cover 501 and bed body 10 and be connected, can be so that the support of bed body 10 is more stable, and movable part 5012 can set up according to the size of bed body 10 to make movable part 5012 drive bed body 10 when rising, can guarantee to support the stability of bed body 10, guarantee holistic reliability.

More specifically, two guide slots 5021 in the horizontal direction are oppositely arranged in the fixing part 5011, and the bracket 502 comprises two groups of first connecting rods 5022 and second connecting rods 5025 which are arranged in a crossed manner; the first link 5022 has a first link 5023, the second link 5025 has a second link 5026, and both the first link 5023 and the second link 5026 are slidably disposed in the guide groove 5021; when the first link 5023 and the second link 5026 approach each other, the first link 5022 and the second link 5025 open to raise the movable portion 5012; when the first link 5023 and the second link 5026 are distant from each other, the first link 5022 and the second link 5025 are folded to lower the movable portion 5012.

In this embodiment, the first link 5022 and the second link 5025 are both hinged, one end of the first link 5022 is connected with the fixed part 5011, the other end of the first link 5022 is connected with the movable part 5012, when the first link 5022 and the second link 5025 are opened together, the movable part 5012 and the bed 10 can be pushed to rise, when the first link 5022 and the second link 5025 are closed together, the movable part 5012 and the bed 10 are driven to fall, and therefore the first link 5022 and the second link 5025 arranged in the accommodating cover 501 can achieve overall lifting and lowering, and stability is better.

Further, a supporting plate disposed between the two guiding grooves 5021 is disposed in the fixing portion 5011, a first connecting shaft 5024 is pivotally disposed between the two groups of first links 5022, a second connecting shaft 5027 is pivotally disposed between the two groups of second links 5025, and the driving device 503 is respectively connected to the first connecting shaft 5024 and the second connecting shaft 5027 to drive the first connecting pivot 5023 and the second connecting pivot 5026 to approach or separate from each other.

The supporting plate can be used for fixing the driving device 503, and the driving device 503 drives the first connecting fulcrum 5023 and the second connecting fulcrum 5026 to be far away from or close to each other on the supporting plate, so that the first connecting rod 5022 and the second connecting rod 5025 are opened or closed, and the movable part 5012 is driven to lift and lower, and the whole use is more convenient, and the operation is simple.

Specifically, the driving device 503 includes a dual-shaft motor 5031 and two second lead screws 5032, the dual-shaft motor 5031 is in transmission connection with the two second lead screws 5032, the two second lead screws 5032 are provided with lead screw nuts, respectively, and tops of the lead screw nuts are connected with the first connecting shaft 5024 and the second connecting shaft 5027, respectively.

The dual-shaft motor 5031 can respectively drive the two second lead screws 5032 to rotate, so that the lead screw nuts are driven by the second lead screws 5032 to slide, and drive the first connecting shaft 5024 and the second connecting shaft 5027 to move away from or close to each other, so that the first connecting rod 5022 and the second connecting rod 5025 are opened or closed, and the movable portion 5012 and the bed body 10 are lifted and lowered, and the whole operation is stable, and the practicability is high.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

The above only be the preferred embodiment of the utility model discloses a not consequently restriction the utility model discloses a patent range, all are in the utility model discloses a conceive, utilize the equivalent structure transform of what the content was done in the description and the attached drawing, or direct/indirect application all is included in other relevant technical field the utility model discloses a patent protection within range.

Claims

1. A centered CT scan bed with three axis motion, comprising:

the top of the bed body is provided with a groove;

the guide seat is arranged in the groove;

2. The centered CT scanning bed of claim 1, wherein the air pump device comprises a plurality of first and second telescoping portions, the first telescoping portion is disposed in the left sidewall of the recess, the second telescoping portion is disposed in the right sidewall of the recess, and the first and second telescoping portions extend to the guide base for connection;

3. The centered CT scanning bed of claim 2, wherein a cavity is disposed in each of the left and right sidewalls and filled with a damping fluid, and the first and second telescoping portions are configured to seal the damping fluid in the cavity;

4. The centered CT scanning bed with three-axis movement according to claim 1, wherein the driving assembly comprises a motor, a first screw rod and a push plate, the groove has a first slide rail disposed along the Z-axis direction of the bed body, the bottom of the push plate is slidably connected to the first slide rail and the top of the push plate is connected to the bed plate, the motor is fixedly disposed in the groove and is in transmission connection with the first screw rod;

5. The centered CT scanning bed of claim 4, wherein the top of the push plate has two second slide rails disposed in parallel along the Z-axis direction of the bed, and the bottom of the bed plate is slidably connected to the two second slide rails, so that the bed plate is along the Z-axis direction of the two second slide rails.

6. The centered CT scanning bed with three-axis motion of claim 1, wherein the lifting mechanism comprises a retractable accommodating cover arranged at the bottom of the bed body, and a bracket and a driving device arranged in the accommodating cover;

7. The centered CT scanning bed of claim 6, wherein the receiving housing comprises a movable portion and a fixed portion, the movable portion is slidably connected to the fixed portion, and the top of the movable portion is fixedly connected to the bottom of the bed body;

8. The centered CT scanning bed of claim 7, wherein two horizontal guide slots are oppositely disposed in the fixed portion, and the support comprises two sets of first and second cross-disposed links;

9. The centered CT scanning bed of claim 8, wherein a supporting plate is disposed in the fixed portion between the two guide slots, a first connecting shaft is pivotally disposed between the two sets of first connecting rods, a second connecting shaft is pivotally disposed between the two sets of second connecting rods, and the driving device connects the first connecting shaft and the second connecting shaft respectively to drive the first connecting fulcrum and the second connecting fulcrum to move closer to or away from each other.

10. The centered CT scanning bed with three-axis movement according to claim 9, wherein the driving device is fixed on the supporting plate, the driving device comprises a two-axis motor and two second screws, the two-axis motor is respectively in transmission connection with the two second screws, the two second screws are respectively provided with a screw nut, and the tops of the screw nuts are respectively connected with the first connecting shaft and the second connecting shaft.