Positioning device and examining table assembly

Abstract

The utility model provides a positioning device and an examining table assembly. The positioning device comprises a base body and a first restraining mechanism. A first guide piece is arranged on the base body; the first restraining mechanism comprises at least two first restraining pieces, the first restraining pieces are movably connected with the first guiding piece, and the at least two first restraining pieces can be connected with each other. The positioning device is used for being placed on a bed body of an examination bed for CT (Computed Tomography) or PET-CT (Positron Emission Tomography-Computed Tomography) examination or other similar examinations so as to perform auxiliary positioning on an infant, and specifically, at least two first restraining pieces which are connected with each other are used for restraining parts such as the trunk of the infant so as to prevent the infant from making unexpected actions to change the posture; and the examination success rate of infants is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical devices, and particularly relates to an alignment device and an examination bed assembly. Background Art

[0002] Computed Tomography (CT), as a medical imaging device that can accurately locate the lesion position of the human body, plays an important role in the diagnosis and treatment of tumors and brain diseases.

[0003] Infants and young children refer to children under 3 years old. During the CT examination, infants and young children have problems such as crying and rolling around randomly due to their young age, which makes the examination difficult to carry out. In this regard, some hospitals use the method of injecting sedatives to make infants and young children fall asleep under the effect of sedatives so that the CT examination can proceed smoothly. However, for examinations such as Positron Emission Computed Tomography (PET-CT) that require a long scanning time, even if infants and young children are asleep, they will still turn over, which will have an adverse impact on the scanning success rate. Therefore, it is hoped to use a restraint device to restrain infants and young children accordingly. Content of the Utility Model

[0004] The purpose of the utility model is to provide an alignment device and an examination bed assembly to assist in aligning infants and young children during scanning examinations such as CT or PET-CT, and to restrain the posture of infants and young children so that the scanning examination of infants and young children can proceed smoothly.

[0005] To achieve the above purpose, the utility model provides an alignment device, including a base body and a first restraint mechanism; a first guide member is provided on the base body; the first restraint mechanism includes at least two first restraint members, the first restraint members are movably connected to the first guide member, and at least two of the first restraint members can be connected to each other.

[0006] Optionally, at least two of the first restraint members form at least one restraint member group, and multiple restraint member groups are arranged in sequence on the first guide member.

[0007] Optionally, a first connecting member is provided on the first restraint member.

[0008] Optionally,

[0009] The first restraint mechanism further includes a second connecting member provided on a predetermined surface of the base body, and the second connecting member can be connected to the first connecting member of at least part of the first restraint members.

[0010] Optionally, the first connecting member and / or the second connecting member includes a magic tape.

[0011] Optionally, the positioning device further includes a second restraint mechanism disposed on the base body; the second restraint mechanism includes two bosses and two third connecting members, the two bosses are arranged oppositely, and a receiving cavity is formed between the two bosses; the surface of the side of the boss away from the base body is a curved surface, and the distance from the curved surface to the base body increases in the direction away from the first restraint mechanism; one of the third connecting members is provided on the outer surface of each boss.

[0012] Optionally, the positioning device further includes a third restraint mechanism for being disposed on a target part of an object; the third restraint mechanism includes a fourth connecting member, and the fourth connecting member can be connected to the first restraint mechanism or the third connecting member.

[0013] Optionally, both the fourth connecting member and the third connecting member include a magic tape.

[0014] To achieve the above object, the present utility model further provides an examination bed assembly, including an examination bed, a joint part and the positioning device as described above; the examination bed includes a bed body, and a second guiding member is provided on the bed body; the joint part is connected to the base body, and the joint part is also movably connected to the second guiding member.

[0015] Optionally, the joint part is detachably connected to the base body.

[0016] Compared with the prior art, the positioning device and the examination bed assembly of the present utility model have the following advantages:

[0017] The aforementioned positioning device includes a base body and a first restraint mechanism; a first guiding member is provided on the base body; the first restraint mechanism includes at least two first restraint members, the first restraint members are movably connected to the first guiding member, and at least two of the first restraint members can be connected to each other. The positioning device is used to be placed on the bed body of an examination bed for CT or PET-CT examination or other similar examinations to assist in positioning an infant. Specifically, the first restraint members that are connected to each other are used to restrain parts such as the torso of the infant to prevent the infant from making unwanted movements and changing the pose, thereby improving the examination success rate of the infant.

[0018] The inspection bed assembly includes an inspection bed, a joint portion, and a positioning device. The inspection bed includes a bed body, and a second guide member is provided on the bed body. The joint portion is connected to the base body, and the joint portion is also movably connected to the second guide member. Thus, when inspecting children of slightly older age, the base body can be quickly moved so that the base body moves to the end of the bed body without interfering with the inspection. In this way, the operator does not need to disassemble the base body when not using the positioning device, but only needs to move it to the end of the bed body, which is simple and convenient to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings are used to better understand the present invention and do not constitute an improper limitation to the present invention. Among them:

[0020] Figure 1 is a schematic structural diagram of the positioning device provided in some embodiments of the present invention, in which a first restraint mechanism is shown, and the first restraint mechanism restrains the torso of an infant.

[0021] Figure 2 is a schematic diagram of an application scenario of the positioning device provided in some embodiments of the present invention, and the positioning device shown in the figure is provided on the bed body of the inspection bed.

[0022] Figure 3 is a schematic diagram of an application scenario of the positioning device provided in some embodiments of the present invention, in which a second connecting member is shown.

[0023] Figure 4 is a schematic diagram of an application scenario of the positioning device provided in some embodiments of the present invention, in which a second restraint mechanism is shown.

[0024] Figure 5 is a schematic diagram of an application scenario of the positioning device provided in some embodiments of the present invention, in which a second restraint member is shown.

[0025] Figure 6 is a schematic structural diagram of the positioning device provided in some embodiments of the present invention, in which only the second restraint mechanism is shown and the first restraint mechanism is omitted.

[0026] Figure 7 is a schematic diagram of an application scenario of the positioning device provided in some embodiments of the present invention, in which the first restraint mechanism is omitted.

[0027] [The description of the reference numerals is as follows]:

[0028] 100 - Substrate, 110 - First guiding member, 200 - First constraint mechanism, 210 - Constraint member group, 211 - First constraint member, 211a - Connection end, 211b - Free end, 220 - Second connecting member, 300 - Second constraint mechanism, 310 - Boss, 311 - Curved surface, 320 - Third connecting member, 410 - Second constraint member, 500 - Sixth connecting member, 1 - Examination bed assembly, 10 - Examination bed, 11 - Bed body, 12 - Second guiding member, 20 - Joint portion. Detailed implementation mode

[0029] The following uses specific specific examples to illustrate the implementation modes of the present utility model. Those skilled in the art can easily understand the other advantages and effects of the present utility model from the content disclosed in this specification. The present utility model can also be implemented or applied through different specific implementation modes. The details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present utility model. It should be noted that the drawings provided in this embodiment only illustrate the basic concept of the present utility model in a schematic manner. Therefore, only the components related to the present utility model are shown in the drawings, rather than being drawn according to the number, shape, and size of the components during actual implementation. The type, quantity, and ratio of each component during actual implementation can be arbitrarily changed, and the component layout type may also be more complex.

[0030] In addition, each of the following description contents of the embodiments has one or more technical features. However, this does not mean that those who use the present utility model must simultaneously implement all the technical features in any one embodiment, or can only separately implement a part or all of the technical features in different embodiments. In other words, on the premise that implementation is possible, those skilled in the art can, according to the disclosure content of the present utility model and depending on design specifications or implementation requirements, selectively implement some or all of the technical features in any one embodiment, or selectively implement the combination of some or all of the technical features in multiple embodiments, thereby increasing the flexibility during the implementation of the present utility model.

[0031] As used in this specification, the singular forms "a", "an", and "the" include plural referents, and the plural form "plural" includes more than two referents, unless the context clearly indicates otherwise. As used in this specification, the term "or" is generally used in the sense of including "and / or", unless the context clearly indicates otherwise, and the terms "mounted", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two components or the interaction relationship between two components. The relational terms such as "first", "second", etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations, nor indicate or imply relative importance or implicitly specify the quantity of the indicated technical features. It should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or component must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] The object of the present invention is to provide a positioning device, which is applied to the scanning examination of imaging devices such as CT or PE-CT, or can also be used in the radiotherapy process of radiotherapy equipment. The application purpose is to assist in positioning infants and young children, so as to avoid the failure of the examination caused by unexpected movements of infants and young children during the examination. The unexpected movements include, but are not limited to, turning over.

[0033] To make the object, advantages and features of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. It should be noted that the drawings are all in a very simplified form and use non-precise scales, and are only used to facilitate and clearly assist in explaining the purpose of the embodiments of the present invention. The same or similar reference numerals in the drawings represent the same or similar components.

[0034] Figure 1 The structural schematic diagram of the positioning device provided by an embodiment of the present invention is shown. As Figure 1As shown, the positioning device includes a base body 100 and a first restraint mechanism 200. A first guide member 110 is provided on the base body 100. The first restraint mechanism 200 includes at least two first restraint members 211, and the first restraint members 211 are movably connected to the first guide member 110 so that the first restraint members 211 can move along the first guide member 110. At least two of the first restraint members 211 can be connected to each other.

[0035] As Figure 2 As shown, the positioning device is applied to the examination bed assembly 1 of medical imaging / therapy equipment such as a CT system or a PET-CT system, and can use the interconnected first restraint members 211 to restrain infants undergoing examinations. Specifically, the examination bed assembly 1 includes the positioning device and an examination bed 10. The examination bed 10 includes a bed body 11, and the base body 100 is disposed on the bed body 11. After a sleeping infant is placed on the base body 100, an operator can connect at least two of the first restraint members 211 to each other to restrain the trunk of the infant and prevent the infant from turning over. Since the first restraint member belt 211 is movably connected to the first guide member 110, the operator can adjust the position of the first restraint member 211 relative to the base body 100 according to the specific position of the infant on the base body 100, so that the position of the first restraint member 211 is adapted to the position of the trunk of the infant, in order to better restrain the trunk of the infant.

[0036] In an embodiment of the present invention, the base body 100 includes a support body and an outer coating layer (not shown in the figure) wrapped on the outer surface of the support body. The support body can be made of a foaming material to effectively support the infant located on the base body 100. And, the base body 100 can be a rectangular structure, with its length direction being the first direction and its width direction being the second direction. The second direction is perpendicular to the first direction. In the figure, the first direction is represented by a two-way arrow X and the second direction is represented by a two-way arrow Y. It can be understood that during normal use, the second direction corresponds to the left-right direction of the infant. For the convenience of description, the left-right direction will be directly referred to as the second direction in the following text.

[0037] The first guiding member 110 may be a chute or a guide rail, and the present utility model does not limit this. The number of the first guiding members 110 is two, and the two first guiding members 110 are arranged at intervals in the left - right direction, and each first guiding member 110 extends along the first direction. A part of at least two first restraining members 211 is located on the left side and is connected to the first guiding member 110 on the left side, and another part of at least two first restraining members 211 is located on the right side and is connected to the first guiding member 110 on the right side. During application, the first restraining member 211 on the left side is connected to the first restraining member 211 on the right side to achieve the restraint of the infant.

[0038] The first restraining member 211 may be a strip - shaped structure, that is, the first restraining member 211 is a restraint belt. The first restraining member 211 has opposite connecting ends 211a and free ends 211b. A first sliding engagement member (not shown in the figure) is provided at the connecting end 211a of each first restraining member 211. The first restraining member 211 on the left side is slidably connected to the first guiding member 110 on the left side through the first sliding engagement member thereon, and the first restraining member 211 on the right side is slidably connected to the first guiding member 110 on the right side through the sliding engagement member thereon.

[0039] At least two first restraining members 211 form a restraining member group 210. Specifically, at least one first restraining member 211 located on the left side and at least one first restraining member 211 located on the right side form a restraining member group 210. During use, the free end 211b of at least one first restraining member 211 located on the left side in the same restraining member group 210 is connected to the free end 211b of at least one first restraining member 211 located on the right side to restrain the infant. In some specific embodiments, each restraining member group 210 includes two first restraining members 211. One of the two first restraining members 211 is located on the left side and is connected to the first guiding member 110 on the left side, and the other is located on the right side and is connected to the first guiding member 110 on the right side. For the convenience of description, hereinafter, the example in which each restraining member group 210 includes two first restraining members 211 will be used for introduction.

[0040] It can be understood that when the number of the restraining member groups 210 is multiple, the multiple restraining member groups 210 can be arranged in sequence in the first direction (as Figure 2 shown).

[0041] The two first restraint members 211 of the same restraint member group 210 can be connected in any suitable manner, such as by tying a knot, or a first connecting member (not shown in the figure) is provided on each of the first restraint members 211, so that the two first restraint members 211 of the same restraint member group 210 can be connected through their respective first connecting members. The first connecting member preferably includes a magic tape, and its advantage is that it can effectively simplify the connection and separation operations of the two first connecting members.

[0042] Please refer again to Figure 3 , the first restraint mechanism 200 further includes a second connecting member 220, and the second connecting member 220 is provided on a predetermined surface of the base body 100. In practice, the predetermined surface is the upper surface of the base body 100. The second connecting member 220 can be located between the two first guiding members 110, and the second connecting member 220 also extends along the first direction, and the second connecting member 220 can be connected to the first connecting member of any one of the first restraint members 211. In the case where the first connecting member includes a magic tape, the second connecting member 220 also preferably includes a magic tape.

[0043] The first restraint mechanism 200 in this form can also restrain the legs of the infant during the leg examination process of the infant, so as to separate the legs of the infant and avoid the situation of the legs crossing or closing together. Or, in the case where the first restraint mechanism 200 includes a plurality of the restraint member groups 210, the trunk and legs of the infant are restrained simultaneously.

[0044] Specifically, when the first restraint mechanism 200 includes at least one restraint member group 210 and there is no need to restrain the torso of the infant, the left leg of the infant can be fixed by using the first restraint member 211 on the left side and the second connecting member 220, and the right leg of the infant can be fixed by using the first restraint member 211 on the right side and the second connecting member 220, so that the legs of the infant can be separated. More specifically, when the dimension of the second connecting member 220 in the second direction is large enough, each first restraint member 211 can partially cover a corresponding leg, and then the first connecting member and the second connecting member 220 are bonded to separate the legs of the infant. When the dimension of the second connecting member 220 in the second direction is small, each first restraint member 211 can partially wind around a corresponding leg, and then the first connecting member and the second connecting member 220 are bonded, and the two legs of the infant can also be separated. Since each first restraint member 211 is movably connected to the corresponding first guiding member 110, the position of each first restraint member 211 on the base body 100 can be adjusted according to the body size of the infant and its specific position on the base body 100, so that the first restraint member 211 can adapt to the leg position of the infant to effectively restrain the legs of the infant.

[0045] When the first restraint mechanism 200 includes more than two restraint member groups 210, the operator can use a part of the restraint member groups 210 to restrain the torso of the infant and use another part of the restraint member groups 210 to restrain the legs of the infant. Specifically, the operator adjusts the position of the restraint member groups 210 according to the body size of the infant and its specific position on the base body 100, so that a part of the restraint member groups 210 corresponds to the torso of the infant and another part of the restraint member groups 210 corresponds to the legs of the infant. For the convenience of description, the restraint member group 210 corresponding to the torso of the infant is called the first restraint member group, and the restraint member group 210 corresponding to the legs of the infant is called the second restraint member group. By connecting the two first restraint belts 211 of the same first restraint member group, the torso of the infant can be restrained; the left leg of the infant can be restrained by using the first connecting member on the first restraint member 211 on the left side in the second restraint member group and the second connecting member 220, and the right leg of the infant can be restrained by using the first connecting member and the second connecting member 220 on the first restraint member 211 on the right side in the second restraint member group.

[0046] Optionally, the positioning device further includes a third restraint mechanism (not shown in the figure). As Figure 4As shown, the third restraint mechanism includes two second restraint members 410. Each second restraint member 410 is disposed on one arm of the infant and includes a second restraint member body and a fourth connecting member, and the fourth connecting member can be connected to the first connecting member. The second restraint member body may be a strip structure, and the fourth connecting members can be provided at both ends thereof. The second restraint member body can be wound and connected by the fourth connecting members at both ends to form a cylindrical structure for sleeving on the arm of the infant.

[0047] When performing a non-chest and abdomen examination on an infant and it is necessary to restrain the trunk, the arms of the infant can be placed naturally, and the fourth connecting member of the second restraint member 410 disposed on the arm can be connected to the first connecting member on the first restraint member 211 that restrains the trunk. The advantages of doing so are that on the one hand, the arms of the infant are restrained to avoid adverse effects on the examination caused by the arms moving randomly, and on the other hand, the operator can clearly understand the position of the arms, and then can separate the arm image and the trunk image during the subsequent image recognition process, reducing the interference of the arm image. Compared with the prior art solution of using a swaddle to wrap the arms and trunk of the infant, it will not occur that the operator cannot know the specific position of the arms due to the arms being blocked by the swaddle, thereby avoiding the problem that it is difficult to separate the arm image and the trunk image in the subsequent image recognition.

[0048] As can be seen from the above introduction, the first restraint mechanism 200 can restrain the trunk and / or legs of the infant, and can also cooperate with the third restraint mechanism during non-chest and abdomen examinations to restrain the naturally placed arms of the infant.

[0049] Those skilled in the art know that when performing a chest and abdomen examination on an infant, it is necessary for the infant to hold the arms up for a long time. For this, it is necessary to restrain the arms of the infant to keep them in the upraised state. In view of this, as Figures 4 to 7As shown, the positioning device further includes a second restraint mechanism 300. The second restraint mechanism 300 is fixedly or detachably provided on the base body 100 and is spaced apart from the first restraint mechanism 200 in the first direction. The second restraint mechanism 300 includes two bosses 310 and two third connectors 320. The two bosses 310 are arranged opposite to each other in the left-right direction, so as to form an accommodation cavity (not marked in the figure) for accommodating the head of the infant between the two bosses 310. The surface of the boss 310 away from the base body 100 (i.e., the upper surface of the boss 310) is a curved surface 311, and the distance from the curved surface 311 to the base body 100 increases in the direction away from the first restraint mechanism 200. One of the third connectors 320 is provided on the outer surface of each boss 310. The third connector 320 can be at least provided on the curved surface 311 and can be connected to the fourth connector of the second restraint member 410.

[0050] During actual inspection, the head of the infant is placed between the two bosses 310. The left arm is placed on the upper surface of the left boss 310, and the fourth connector of the second restraint member 410 on the left arm is connected to the third connector 320 on the left boss 310. The right arm is placed on the upper surface of the right boss 310, and the fourth connector of the second restraint member 410 on the right arm is connected to the third connector 320 on the right boss 310. In this way, the two arms can be kept in the raised state.

[0051] In a preferred embodiment, both the third connector 320 and the fourth connector include magic tapes. It should be noted that in the case where the first connector, the second connector 220, the third connector 320 and the fourth connector all include magic tapes, those skilled in the art know how to set these magic tapes to achieve the above functions.

[0052] Furthermore, as Figure 2 shown, the embodiment of the present invention further provides an examination bed assembly 1. The examination bed assembly 1 includes the aforementioned positioning device and an examination bed 10. The examination bed 10 includes a bed body 11, and the length direction of the bed body 11 is the first direction. The base body 100 is connected to the bed body 11.

[0053] Due to the large throughput of CT or PET-CT scans in pediatric emergency departments, in addition to examining infants and young children, children who are older and can maintain the desired position without restraint are also examined. Therefore, it is desirable that the positioning device can be easily removed or displaced to reduce the preparation time when switching the category of the examinee. Thus, in the embodiment of the present invention, the base body 100 is movably connected to the bed body 11 and can move relative to the bed body 11 along the first direction. In this way, when examining infants and young children, the base body 100 can be quickly moved to the head or middle part of the bed body 11, so that the base body 100 can enter the scanning area of CT or PET-CT as the bed body 11 moves and complete the examination of infants and young children. When examining children, the base body 100 can be quickly moved to the end of the bed body 11, so that the base body 100 will not enter the scanning area of CT or PET-CT as the bed body 11 moves. When a child lies on the bed body 11 and is on the side of the base body 100 close to the head of the bed body 11, the positioning device will not interfere with the examination of the child. That is, for different categories of examinees, the operator does not need to disassemble and assemble the base body 100, saving the examination preparation time.

[0054] Optionally, a second guiding member 12 is provided on the bed body 11, and the second guiding member 12 extends along the first direction. The examination bed assembly 10 further includes a joining portion 20, one end of the joining portion 20 is connected to the base body 100, and the other end is movably connected to the second guiding member 12. That is, the base body 100 is connected to the bed body 11 through the joining portion 20.

[0055] Furthermore, the joining portion 20 is also detachably connected to the base body 100, so that the operator can disassemble the base body 100 from the bed body 11 when necessary.

[0056] Optionally, the number of the second guiding members 12 is two, and the two second guiding members 12 are arranged on the left and right sides of the bed body 11. The number of the joint parts 20 is at least two, and each joint part includes a strap, a second sliding joint and a fifth connecting member (not shown in the figure). The second sliding joint is arranged at one end of the strap, and the fifth connecting member is arranged on the strap. A plurality of sixth connecting members 500 are further arranged on the base body 100. A part of the plurality of sixth connecting members 500 is located on the left side of the base body 100, and another part is located on the right side of the base body 100. The second sliding joints of at least part of the joint parts 20 are slidably connected to the second guiding members 12 on the left side, and the fifth connecting member of each joint part 20 located on the left side is connected to one of the sixth connecting members 500 located on the left side of the base body 100; the second sliding joints of at least part of the joint parts 20 are slidably connected to the second guiding members 12 on the right side, and the fifth connecting member of each joint part 20 located on the right side is connected to one of the sixth connecting members 500 located on the right side of the base body 100.

[0057] Both the fifth connecting member and the sixth connecting member include magic tapes.

[0058] Although the present invention is disclosed as above, it is not limited thereto. Those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims

1. A positioning device, characterized in that: The invention comprises a base (100) and a first constraint mechanism (200); the base (100) is provided with a first guide member (110); the first constraint mechanism (200) comprises at least two first constraint members (211); the first constraint members are movably connected to the first guide member (110); a first connecting member is provided on the first constraint member (211); and at least two first constraint members can be connected to each other through the first connecting member; The first restraint mechanism (200) further comprises a second connecting member (220) arranged on the base (100), wherein the second connecting member (220) is capable of being connected to the first connecting member of at least part of the first restraint member (211).

2. The positioning device according to claim 1, characterized in that: At least two of the first restraining members (211) form at least one restraining member group (210), and a plurality of the restraining member groups (210) are arranged in sequence on the first guide member.

3. The positioning device according to claim 1, characterized in that: The first connecting member and / or the second connecting member (220) comprises Velcro.

4. The positioning device according to claim 1, characterized in that: The positioning device also includes a second constraint mechanism (300), which is arranged on the base (100). The second constraint mechanism (300) includes two bosses (310) and two third connecting members (320). The two bosses (310) are arranged opposite to each other, and a receiving cavity is formed between the two bosses (310); the surface of the boss (310) away from the base (100) is a curved surface (311), and the distance from the curved surface (311) to the base (100) increases in a direction away from the first constraint mechanism (200); and a third connecting member (320) is provided on the outer surface of each boss (310).

5. The positioning device according to claim 4, characterized in that: The positioning device also includes a third constraint mechanism, which is used to be set on a target part of an object; the third constraint mechanism includes a fourth connecting member, which can be connected to the first constraint mechanism (200) or the third connecting member (320).

6. The positioning device according to claim 5, characterized in that: The fourth connecting member and the third connecting member (320) both comprise Velcro.

7. An examination bed assembly, characterized in that: The invention comprises an examination bed (10), a joint (20) and a positioning device as described in any one of claims 1 to 6; the examination bed (10) comprises a bed body (11), and a second guide member (12) is provided on the bed body (11); the joint (20) is connected to the base (100), and the joint (20) is also movably connected to the second guide member (12).

8. The examination bed assembly according to claim 7, wherein: The joint (20) is detachably connected to the base (100).

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