CN217852962U - Die body - Google Patents

Abstract

The utility model relates to a die body. The die body comprises an inner ball and an outer shell; the outer shell forms a closed space, and the inner ball is supported or suspended in the closed space; and forming an internal cavity between the inner ball and the outer shell; the inner cavity is filled with imaging media, and the imaging media can cover the outer surface of the inner ball. The utility model discloses a die body can be with the help of processing technology simpler and can obtain higher size precision's interior ball surface, improves the internal diameter size precision of the annular signal that the imaging scanning obtained, and then improves magnetic resonance imaging system gradient sensitivity calibration accuracy.

Description

Die body

Technical Field

The utility model relates to a magnetic resonance imaging system calibration equipment technical field especially relates to a die body.

Background

The magnetic resonance imaging system needs to correct the gradient sensitivity of the system to ensure that the magnetic resonance imaging system can obtain an image conforming to the real size scale. In the calibration item, imaging measurement needs to be performed by means of a phantom with a specified size, and then the image size obtained by measurement is compared with the size of the phantom for calibration.

A die body is used in a gradient sensitivity calibration item of a magnetic resonance imaging system, the currently used die body is a hollow sphere, a spherical imaging signal can be obtained during scanning imaging by filling an imaging medium in the die body, and the position where the imaging medium is in contact with the inner surface of the die body is an imaging signal edge, namely the imaging signal edge is formed by the inner surface of a sphere model. Therefore, it is necessary to perform high-precision machining on the inner surface of the mold body to ensure the dimensional precision of the inner surface thereof, thereby ensuring the calibration precision.

In order to improve the dimensional accuracy of the inner surface of the die body, a bonding process, a blow molding process and even a 3D printing process are currently adopted for preparing the hollow sphere. However, the hollow spheres prepared by these processes have uneven wall thickness and non-circular inner walls, which leads to insufficient dimensional accuracy of the inner surface of the mold body. For example, in 3D printing preparation, although the problem of processing difficulty in the conventional processing technology can be overcome, due to the influence of gravity, the die body sinks in a single side under the action of gravity to cause deviation of the size of the inner surface, and as the diameter size of the die body is larger, the error is larger, and the checking precision is finally influenced.

SUMMERY OF THE UTILITY MODEL

On the basis, the problem that the subsequent checking precision is influenced because the mold body cannot reach the dimensional precision of the inner surface by adopting the current processing technology is necessary to be solved, A die body with a brand new structure is provided.

The die body comprises an inner ball and an outer shell; the outer shell forms a closed space, and the inner ball is supported or suspended in the closed space; and forming an internal cavity between the inner ball and the outer shell; the inner cavity is filled with imaging media, and the imaging media can cover the outer surface of the inner ball.

In one embodiment, the shell is provided with a liquid filling port; the liquid filling port is communicated with the inner cavity; the die body also comprises a sealing plug which is used for being matched with the liquid filling port and enabling the liquid filling port to be opened or closed.

In one embodiment, the sealing plug comprises a main body part, an injection hole arranged on the main body part, and a plug matched with the injection hole;

the main body part and the shell are in threaded fit at the liquid filling port, the liquid filling hole comprises a circular through hole exposed outside the main body part and a conical through hole arranged in the main body part, and the conical through hole can be communicated with the inner cavity.

In one embodiment, the shell is of a split structure and is formed by splicing a plurality of components.

In one embodiment, the components forming the shell are connected by screw threads or bolts.

In one embodiment, the die body is further provided with a connecting piece; the connecting piece is positioned between the inner ball and the shell, and two ends of the connecting piece are respectively connected with the inner ball and the shell.

In one embodiment, the connecting piece is of a hard rod structure, and a connecting hole is formed in the surface of the inner ball; one end of the connecting piece is in threaded connection with the shell, and the other end of the connecting piece is connected with the connecting hole.

In one embodiment, the connecting hole is a thimble hole structure, and the end of the connecting piece is a corresponding thimble structure.

In one embodiment, the connecting piece comprises a flexible rope structure and suckers which are respectively fixed on the outer surface of the inner ball and the inner surface of the outer shell in an adsorbing way; one end of the flexible rope structure is connected with the sucker on the outer surface of the inner ball, and the other end of the flexible rope structure is connected with the sucker on the inner surface of the shell.

In the phantom, the phantom is designed into a double-layer structure consisting of an inner ball and an outer shell, and an inner cavity filled with imaging media is formed between the inner ball and the outer shell, so that a signal edge of scanning imaging is formed between the outer surface of the inner ball and the imaging media, namely, the inner diameter size of an annular signal obtained by imaging scanning is determined by the outer surface size of the inner ball. Therefore, the outer surface of the inner ball with higher dimensional accuracy can be obtained by means of simpler processing technology, the dimensional accuracy of the inner diameter of a spherical imaging signal obtained by imaging scanning is improved, and the calibration accuracy of the gradient sensitivity of the magnetic resonance imaging system is further improved.

Drawings

Fig. 1A is a schematic structural diagram of a mold body according to an embodiment of the present invention;

fig. 1B is a schematic structural diagram of a sealing plug of a mold body according to an embodiment of the present invention;

FIG. 2 is an enlarged view of a portion of the structure at I in FIG. 1A;

fig. 3 is a schematic structural diagram of a mold body according to another embodiment of the present invention.

Description of the reference symbols:

1-inner sphere; 2-a housing; 3-inner cavity; 4-a liquid filling port; 5-sealing plug; 6-connecting piece; 7-a sucker; 21-a connection hole; 51-a body portion; 52-sealing ring; 53-first pour hole; 54-a second liquid injection hole; 55-a first plug; 56-second plug.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and 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", "radial", "circumferential", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and for 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 thus, 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 at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. 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 application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Referring to fig. 1A to 3, fig. 1A shows a structural form of a mold body according to an embodiment of the present invention, fig. 2 shows a partial structural form of a position I in fig. 1A, and fig. 3 shows a structural form of a mold body according to another embodiment of the present invention.

An embodiment of the utility model provides a die body is applicable to magnetic resonance equipment's gradient sensitivity and rectifies, including interior ball 1 and shell 2. Wherein the inner ball 1 is located inside the outer shell 2 and an inner cavity 3 is formed between the inner ball 1 and the outer shell 2. The inner cavity 3 is filled with an imaging medium, and the imaging medium covers the outer surface of the inner sphere 1, and the imaging medium may comprise one or a combination of more of an aqueous solution, a gel, an inert gas, and the like. In this embodiment, the inner ball 1 and the outer shell 2 are both made of organic plastics, so as to achieve the purpose of not affecting the receiving of the magnetic resonance signal of the scanned object in the magnetic resonance imaging scan. Also, in other embodiments, the inner ball and the outer shell may be made of other materials, such as photosensitive resin, etc., according to the processing method and the use condition.

At the moment, when the die body is used for calibrating the gradient sensitivity of the magnetic resonance imaging system, the imaging medium in the inner cavity can generate spherical imaging signals when the die body is subjected to imaging scanning, so that the inner diameter of the spherical imaging can meet the requirement of the gradient sensitivity for calibration calculation processing. Therefore, the inner diameter of the spherical imaging signal is composed of the outer surface of the inner sphere and the imaging medium, so that the size precision of the inner diameter of the spherical imaging signal depends on the size precision of the outer surface of the inner sphere, and compared with the size precision of the inner surface of the existing hollow sphere, the size precision of the outer surface of the inner sphere is easier to process and guarantee, the outer surface of the inner sphere has higher size precision, the size precision of the inner diameter of the spherical imaging signal obtained by imaging scanning is improved, and the gradient sensitivity calibration precision of a magnetic resonance imaging system is improved.

Simultaneously, compare in the die body of hollow sphere structure, the filling of cavity formation of image medium is carried out to the die body of the bilayer structure of this embodiment utilizes in, can be under the condition that obtains the spherical imaging signal of equidimension, and the greatly reduced reduces the use amount to the formation of image medium, reduces the use cost of formation of image medium, and when interior ball and the shell that the light-duty material of stereoplasm was prepared were chooseed for use in further cooperation, the quality of the whole die body of greatly reduced improved, the improvement is to the nimble convenience of use of this die body.

Referring to fig. 1A, a liquid filling port 4 is further formed in the mold body of this embodiment. A liquid charging port 4 is opened in the housing 2 and is brought into communicating relation with the inner chamber 3. Meanwhile, a sealing plug 5 connected through threads is arranged on the liquid filling port 4 to form opening and closing control on the liquid filling port 4, so that the liquid filling port 4 can be opened and closed repeatedly.

At the moment, the perfusion operation and the discharge operation of the imaging medium can be carried out to the inner cavity at any time through the liquid filling port. Like this, in the storage and the transfer transportation process to the die body, just can discharge the formation of image medium in the cavity in advance through the liquid filling mouth, reduce the quality of whole die body, wait to carry out the pouring of formation of image medium according to specific operation requirement again when using to improve the use flexibility and the convenience of this die body.

However, in other embodiments, the liquid filling port may be designed to be disposable depending on the usage of the mold body and the material of the housing. For example, the shell filled with the imaging medium is sealed in a heat sealing mode at one time, so that the sealing effect on the imaging medium is improved, and the leakage and the dripping which possibly occur in the long-time repeated use process of the die body are avoided.

Referring to fig. 1A, in the mold body of the present embodiment, the outer shell 2 is a sphere structure, forming a closed space, the inner sphere 1 can be supported or suspended in the closed space, a gap exists between the inner surface of the outer shell 2 and the outer surface of the inner sphere 1, and the gap can be filled with an imaging medium. That is, the gap between the inner surface of the housing 2 and the outer surface of the inner ball 1 constitutes the inner cavity 3 described above. In this embodiment, the housing 2 is formed of a hemispherical structure having upper and lower portions. Wherein, an internal thread 101 is arranged at one end of the upper hemisphere of the shell 2 close to the lower hemisphere, and a corresponding external thread 102 is arranged at one end of the lower hemisphere of the shell 2 close to the upper hemisphere.

Like this, through being split type structure with the shell design and adopt detachable fixed connection between the different parts, not only be convenient for process manufacturing to the shell, guarantee the machining precision of shell size, through the detachable fixed connection of screw thread mode formation moreover, can also carry out convenient getting to interior ball and put the operation, the equipment of quick convenient completion shell and interior ball promptly. Meanwhile, in the internal space range formed by the shell, the inner ball with different outer diameter sizes can be replaced, so that spherical imaging signals with different inner diameter sizes are obtained, the use of more calibration working conditions is met, and the use efficiency of the die body is greatly improved.

It is understood that in other embodiments, a connector such as a bolt may be used to connect the upper hemisphere to the lower hemisphere. For example, a threaded hole is respectively formed in one end, close to the upper hemisphere, of the lower hemisphere of the outer shell 2 and one end, close to the lower hemisphere, of the upper hemisphere of the outer shell 2, the two threaded holes are aligned, then the bolt is matched with the two threaded holes respectively, and therefore the connection between the upper hemisphere and the lower hemisphere can be achieved.

In one embodiment, the shell is provided with a liquid filling port and a sealing plug arranged at the liquid filling port, and the liquid filling port is communicated with the inner cavity. The sealing plug can comprise a main body part, a liquid injection hole arranged on the main body part and a plug matched with the liquid injection hole. The main body part is in threaded fit with the shell at the liquid filling port, the liquid filling hole comprises a circular through hole exposed outside the main body part and a conical through hole arranged in the main body part, the circular through hole is communicated with the conical through hole, the circular through hole is used for being communicated with the outside of the die body, and the conical through hole can be communicated with the inner cavity.

Fig. 1B is a schematic structural diagram of a sealing plug 5 of a mold body according to an embodiment of the present invention. The sealing plug 5 comprises a main body part 51, the main body part 51 comprises a sealing head 511 and a conducting part 512 extending longitudinally, the conducting part 512 can penetrate into a gap between the inner surface of the outer shell 2 and the outer surface of the inner ball 1, and the sealing head 511 can be provided with threads so as to realize threaded matching connection with a die body at the position of the liquid filling port 4. In order to improve the sealing performance of the mold body, the sealing plug 5 is further provided with a sealing ring 52, and the sealing ring 52 can move from the conducting part 512 to the end socket 511 and is sleeved at the position of the end socket 511, so that the sealing plug 5 and the mold body are sealed after being in threaded connection. Further, the pouring hole provided in the main body 51 includes a first pouring hole 53 and a second pouring hole 54, and the stopper fitted to the pouring hole includes a first stopper 55 and a second stopper 56. Wherein, the first liquid injection hole 53 is matched with the first plug 55; the second pour hole 54 is fitted with a second stopper 56.

The first pour hole 53 is used for filling with an imaging medium, and the second pour hole 54 facilitates observation of the volume of the internal solution and evacuation of air from the mold. In this embodiment, the first pour hole 53 is divided into two parts: a forward tapered through hole (a portion opened in the main body portion 51) and a circular through hole (a portion exposed outside the main body portion 51). The tapered through hole of the first filling hole 53 is designed to facilitate the tapered surface of the end of the filling tool to be tightly matched with the tapered through hole to prevent the imaging medium from overflowing during filling. The first plug 55 is also of a reverse tapered design, which facilitates the ability of the first plug 55 to mate with the first pour hole 53 after filling with imaging media to prevent leakage of the solution from the first pour hole 53. In this embodiment, the engaging structure of the second pouring hole 54 and the second plug 56 is the same as the engaging structure of the first pouring hole 53 and the first plug 55.

Referring to fig. 3, in other embodiments, the housing may be designed in other structural forms according to different use conditions of the mold body, for example, different placement and fixing manners in the use process of the mold body. For example, the casing is designed into a box-type structure of a cube, so that the die body can be directly and stably placed on the checking platform. In this case, the housing may be designed to have an opening, for example, the housing includes a case and a cover. The box has an opening towards the top to the apron sets up at this opening part, and the apron passes through the bolt and is connected with the box, thereby this opening part can be as the operation mouth of ball in the installation and pouring imaging medium into. At this time, although the imaging signal generated by the imaging medium filled between the inner sphere and the shell is no longer a spherical imaging signal with spherical surfaces on the inner side and the outer side, the inner surface still maintains a spherical imaging signal corresponding to the outer surface of the inner sphere, so that the requirement of gradient sensitivity for calibration calculation can be met.

In one embodiment, the inner ball 1 is supported and disposed within the enclosed space of the outer shell 2. Referring to fig. 1A, four connecting members 6 are further provided in the mold body of the present embodiment. Four connecting pieces 6 are of a hard rod structure and are positioned between the inner ball 1 and the outer shell 2. Wherein, one end of the connecting piece 6 is connected with the inner ball 1, and the other end is connected with the shell 2, thereby supporting and fixing the inner ball 1 in the shell 2.

Referring to fig. 1A and 2, four connection holes 21 are formed in the outer surface of the inner ball 1, and the connection holes 21 have a center hole structure. Meanwhile, four corresponding threaded holes are formed in the shell 2, external threads are formed in the connecting piece 6, and the end portion of the connecting piece 6 is in an ejector pin structure form.

At this moment, four connecting pieces 6 can penetrate the inside of the outer shell 2 from outside to inside through four threaded holes on the outer shell 2 respectively, and form threaded connection with the outer shell 2 respectively, and the connecting piece 6 extending into the inside of the outer shell 2 forms butt joint with the connecting holes 21 of the four thimble hole structural forms on the surface of the inner ball 1 through the thimble structure of the end part thereof, so that the inner ball 1 is fixedly propped in the inside of the outer shell 2 by the four connecting pieces 6.

In this embodiment, through design into connecting piece 6 with interior ball 1 and shell 2 be detachable fixed connection mode, just can make the cooperation of installing use with the shell 2 of different forms of interior ball 1 of same size to and the cooperation of installing use is carried out with the same form shell 2 to the interior ball 1 of not unidimensional, thereby further increases the use flexibility and the convenience of this die body, improves the availability factor of this die body under more operating modes.

In addition, in the embodiment, by designing the connecting hole 21 on the surface of the inner ball 1 into the structure form of the thimble hole, the connecting hole 21 can be used as an auxiliary positioning hole in the inner ball processing process at the same time. Therefore, the same connecting hole 21 can be used for processing and mounting the inner ball, the number and frequency of holes on the surface of the inner ball 1 are reduced, and the influence on the size precision of the surface of the inner ball is reduced.

In the present embodiment, the four connecting members 6 are used to abut against the inner ball 1 from different directions, so that the inner ball 1 is fixed inside the outer casing 2. However, in other embodiments, the number and position of the connecting members 6 and the connection manner of the connecting members 6 and the inner ball 1 may be adjusted according to the sizes of the inner ball 1 and the outer shell 2. For example, for the large-sized inner ball 1 and the large-sized outer shell 2, the connecting piece 6 can be screwed by forming a threaded hole on the surface of the inner ball 1, and for the small-sized inner ball 1 and the small-sized outer shell 2, the connecting piece 6 with external threads can be directly and fixedly connected with the surface of the inner ball 1, so that the connecting piece 6 is fixedly connected with the outer shell 2 by penetrating the outer shell 2 from inside to outside and then connecting with the nut with the sealing piece.

In addition, in other embodiments, the connecting member 6 may also adopt a flexible rope structure. One end of the flexible rope is fixedly connected with the outer surface of the inner ball 1, and the other end of the flexible rope penetrates through the outer shell 2 and is fixedly connected with the outer surface of the outer shell 2 or is directly fixedly connected with the inner surface of the outer shell 2, so that the inner ball 1 is fixed inside the outer shell 2 in a traction manner.

In one embodiment, the inner ball 1 is suspended within the enclosed space of the outer shell 2. Referring to fig. 3, when the connector is of a flexible rope structure, the connector 6 can fix the inner ball 1 inside the housing 2 by installing the suckers 7 at the two ends of the connector 6 respectively, and utilizing the adsorption connection between the suckers 7 and the outer surface of the inner ball 1 and the adsorption connection formed between the suckers 7 and the inner surface of the housing 2. Thus, the connecting structure arranged on the surface of the inner ball 1 and the surface of the outer shell 2 is omitted, so that the external dimensional precision of the inner ball 1 and the structural strength of the outer shell 2 are ensured.

Even in other embodiments, according to the density of the imaging medium filled in the housing 2 and the size of the inner sphere, the inner sphere 1 can be manufactured by selecting a suitable material, so that the gravity and the buoyancy of the inner sphere 1 are balanced, and the inner sphere is stabilized in the imaging medium in a suspension manner, the connecting piece 6 is omitted, and the purpose of generating spherical imaging signals on the outer surface of the inner sphere 1 is achieved.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (8)

1. A mold body comprising an inner ball and an outer shell; the outer shell forms a closed space, and the inner ball is supported or suspended in the closed space; and forming an internal cavity between the inner ball and the outer shell; the inner cavity is filled with imaging media, and the imaging media can cover the outer surface of the inner ball.

2. The mold body of claim 1, wherein a liquid filling port is provided on the housing; the liquid filling port is communicated with the inner cavity; the die body also comprises a sealing plug which is used for being matched with the liquid filling port and enabling the liquid filling port to be opened or closed.

3. The mold body of claim 2, wherein the sealing plug comprises a main body part, a liquid injection hole arranged on the main body part, and a plug matched with the liquid injection hole;

the main body part and the shell are in threaded fit at the liquid filling port, the liquid filling hole comprises a circular through hole exposed outside the main body part and a conical through hole arranged in the main body part, and the conical through hole can be communicated with the inner cavity.

4. The mold body of claim 1, wherein the housing is a split structure and is formed by splicing a plurality of components, and the plurality of components are connected by screw threads or bolts.

5. The mold body according to any one of claims 1 to 4, characterized in that the mold body is further provided with a connecting piece; the connecting piece is positioned between the inner ball and the shell, and two ends of the connecting piece are respectively connected with the inner ball and the shell.

6. The mold body of claim 5, wherein the connecting piece is a hard rod structure, and a connecting hole is formed in the surface of the inner ball; one end of the connecting piece is in threaded connection with the shell, and the other end of the connecting piece is connected with the connecting hole.

7. The die body of claim 6, wherein the attachment holes are thimble hole structures and the ends of the connectors are corresponding thimble structures.

8. The mold body of claim 5, wherein the connecting piece comprises a flexible rope structure and suckers respectively fixed on the outer surface of the inner ball and the inner surface of the outer shell in an absorption manner; one end of the flexible rope structure is connected with the sucker on the outer surface of the inner ball, and the other end of the flexible rope structure is connected with the sucker on the inner surface of the shell.

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