Non-magnetization high-pressure injector used under ultrahigh field intensity

Abstract

The utility model belongs to the technical field of high-pressure injectors, and relates to a non-magnetization high-pressure injector used under ultrahigh field intensity, which comprises a non-magnetic shielding cavity formed by a front shell, an upper shell and a lower shell, a non-magnetic metal paint surface is attached inside the front shell, a hollow non-magnetic keel is arranged in the non-magnetic shielding cavity, and the non-magnetic keel is connected with the left end and the right end of the upper shell in a buckling mode. A front fixing plate and a rear fixing plate are arranged on the front side and the rear side of the non-magnetic keel respectively, the front fixing plate is connected with the front shell, the rear fixing plate is connected with a mounting frame for mounting the non-magnetic ultrasonic motor, a transmission wheel and a gear which are meshed are arranged on the rear fixing plate, output shafts on the two sides of the non-magnetic ultrasonic motor are connected with the gear and a non-magnetic encoder respectively, and a push rod is arranged in a hollow cavity of the non-magnetic keel. The other end of the push rod penetrates through the front fixing plate and extends out of the front shell to be connected with the needle cylinder. A non-magnetic ultrasonic motor is adopted as a power source of the injector, the driving principle of the motor is based on the inverse piezoelectric effect of ceramics, and large-torque output can be achieved without an electromagnetic field.

Description

Technical Field

[0001] The utility model belongs to the technical field of high-pressure injectors and relates to a non-magnetized high-pressure injector used under ultra-high field strength. Background Art

[0002] As an auxiliary device in the radiology diagnosis and treatment system, the high-pressure injector is gradually used in clinical practice with the development of X-ray, fast film changer, image intensifier and artificial contrast agent. Its application in MRI is similar. The contrast agent injection button of the high-pressure injector is activated for a specific injection sequence. The contrast agent enters the human blood vessels through the indwelling needle line. The MRI equipment performs the final imaging, which can perform imaging diagnosis on the lesion.

[0003] Existing high-pressure injectors are based on brushless motors as the power device of the high-pressure injectors. The rotor of the brushless motor is a permanent magnet. In low-magnetic field nuclear magnetic resonance equipment, the brushless motor is placed at the base of the injector, and the syringe is controlled to absorb and inject medicine through a flexible shaft transmission. However, the high-pressure injector cannot be perfectly adapted to nuclear magnetic resonance equipment with ultra-high magnetic field strength (specifically 5.0T and above magnetic field). Permanent magnets in ultra-high field strengths will affect the normal operation of the nuclear magnetic resonance equipment and cause magnetic displacement of the equipment, posing a risk of use. Summary of the invention

[0004] In view of the shortcomings of the prior art, the utility model provides a non-magnetized high-pressure injector for ultra-high field strength, the power source adopts a non-magnetic ultrasonic motor, the driving principle of which is based on the inverse piezoelectric effect of ceramics rather than the electromagnetic effect of traditional motors, and can achieve high torque output without electromagnetic fields. In addition, the system adopts a non-magnetized structure as a whole, the shell adopts a process of spraying non-magnetic metal paint, the motor encoder also uses a non-magnetic encoder, and aluminum alloy is used instead of traditional iron materials, so as to achieve an overall non-magnetized design.

[0005] The technical solution provided by the utility model is as follows:

[0006] The utility model provides a non-magnetized high-pressure syringe for use under ultra-high field strength, comprising a front shell with a non-magnetic metal paint surface attached to the inside, a non-magnetic shielding cavity composed of an upper shell and a lower shell, a hollow non-magnetic keel is arranged in the non-magnetic shielding cavity, the non-magnetic keel is snap-connected to the left and right ends of the upper shell, a front fixing plate and a rear fixing plate are respectively arranged on the front and rear sides of the non-magnetic keel, the front fixing plate is connected to the front shell, the rear fixing plate is connected to a mounting frame for installing a non-magnetic ultrasonic motor, a meshing transmission wheel and a gear are arranged on the rear fixing plate, the shafts on both sides of the non-magnetic ultrasonic motor are respectively connected to the gears and the non-magnetic encoder, a push rod is arranged in the hollow cavity of the non-magnetic keel, one end of the push rod is connected to the transmission wheel, and the other end of the push rod penetrates the front fixing plate and extends out of the front shell to be connected to the syringe.

[0007] Furthermore, the front shell, the upper shell and the lower shell are all ABS plastic shells.

[0008] Furthermore, the non-magnetic metal paint surface includes an inner paint surface and an outer paint surface, the inner paint surface is a metal copper spray paint with a thickness of 0.5 mm, and the outer paint surface is a varnish with a thickness of 25 um.

[0009] Furthermore, a non-magnetic metal sealing conductive rubber ring is provided at the connection between the upper shell and the lower shell, and a circle of non-magnetic metal sealing conductive rubber ring is attached to the edge of the front shell.

[0010] Furthermore, the lower shell is provided with a groove for accommodating the non-magnetic metal sealing conductive rubber ring.

[0011] Furthermore, the non-magnetic keel includes a left keel and a right keel arranged in a stepped manner, the upper step surfaces of the left keel and the right keel are arranged to face outward, the width of the upper step surface is smaller than the lower step surface, and a protrusion extends downward on the inner side of the lower step surface of the left non-magnetic keel and the right keel, and the protrusion and the upper step surface are provided with threaded holes connected to the front fixing plate and the rear fixing plate.

[0012] Furthermore, the mounting frames are symmetrically arranged in an L-shape on both sides of the rear fixing plate corresponding to the left keel and the right keel, and the vertical side surfaces of the mounting frames on both sides are provided with buckles that cooperate with the upper shell.

[0013] Furthermore, the upper and middle corners of the lower step surfaces of the left and right keels near the rear fixing plate are recessed toward the front fixing plate, and the recessed position is used to install a potentiometer for calculating the movement distance of the push rod.

[0014] Furthermore, the shells of the non-magnetic ultrasonic motor and the non-magnetic encoder are both made of aluminum alloy.

[0015] Furthermore, the upper shell and the lower shell, the non-magnetic keel and the front fixing plate, the rear fixing plate, the non-magnetic ultrasonic motor and the rear fixing plate are all fixedly connected by copper screws. Beneficial Effects

[0016] The power source of traditional high-pressure injectors is mainly based on brushless motors, and the rotor of brushless motors has permanent magnets, but permanent magnets cannot be used in ultra-high field strengths. The utility model uses a non-magnetic ultrasonic motor as a power source. The non-magnetic ultrasonic motor is mainly based on piezoelectric ceramics as a driving element. When an AC voltage is applied to the piezoelectric ceramics, high-frequency expansion and contraction deformation will occur, and then the stator structure of the motor will be driven to vibrate at ultrasonic frequencies, which is different from the electromagnetic effect movement of traditional motors. Therefore, it can be well applied to ultra-high magnetic field strength environments (specifically 5.0T and above magnetic fields), and the non-magnetic ultrasonic motor does not have magneto-induced displacement and is not affected by the magnetic field.

[0017] The utility model adopts a non-magnetized structure as a whole. Through the internal structure of the shell with a non-magnetic metal paint surface attached internally, the non-magnetic keel, the non-magnetic ultrasonic motor, and the non-magnetic encoder, it realizes the precise high-voltage injection function without magnetic interference in an ultra-high field strength environment. It can adapt well to ultra-high magnetic field strength (especially 5.0T and above magnetic field), and meets the needs of non-magnetization, high stability and precise control.

[0018] The utility model adopts the design of non-magnetic keel and fixing plate to enhance the structural stability of the syringe, while the meshing of the transmission wheel and the gear ensures the accuracy of the push rod movement. The use of non-magnetic encoder can monitor and feedback the position of the push rod in real time, further improving the accuracy of injection. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The utility model is a schematic diagram of the overall structure of a non-magnetized high-pressure injector used under ultra-high field strength.

[0020] Figure 2 It is a structural schematic diagram of the utility model in which the non-magnetic keel is connected to the front shell and the mounting frame through the front fixing plate and the rear fixing plate.

[0021] Figure 3 The utility model is a structural schematic diagram of the connection relationship between the non-magnetic keel and the push rod, and the push rod and the syringe.

[0022] Figure 4 It is a structural schematic diagram of the non-magnetic keel of the utility model.

[0023] Explanation of the accompanying drawings: 1. front shell; 2. upper shell; 3. lower shell; 4-1 left keel; 4-2. right keel; 5-1. left non-magnetic ultrasonic motor; 5-2. right non-magnetic ultrasonic motor; 6-1. left non-magnetic encoder; 6-2. right non-magnetic encoder; 7-1. front fixing plate; 7-2. rear fixing plate; 8-1. left mounting frame; 8-2. right mounting frame; 9. buckle; 10-1. left push rod; 10-2. right push rod; 11-1. left syringe; 11-2. right syringe; 12-1. left transmission wheel; 12-2. right transmission wheel; 13-1. left gear; 13-2. right gear; 14-1. upper step surface; 14-2. lower step surface; 14-3. bump; 14-4. threaded hole; 14-5. fixing block. DETAILED DESCRIPTION

[0024] The utility model is further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and cannot be used to limit the protection scope of the utility model.

[0025] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances. Example 1

[0027] like Figure 1 As shown, an embodiment of the utility model provides a non-magnetized high-pressure syringe for use under ultra-high field strength, comprising a front shell 1 with a non-magnetic metal paint surface attached to the interior, an upper shell 2 and a lower shell 3 to form a non-magnetic shielding cavity, a hollow non-magnetic keel is provided in the non-magnetic shielding cavity, the non-magnetic keel is snap-connected to the left and right ends of the upper shell 2, a front fixing plate 7-1 and a rear fixing plate 7-2 are respectively provided on the front and rear sides of the non-magnetic keel, the front fixing plate 7-1 is connected to the front shell 1, the rear fixing plate 7-2 is connected to a mounting frame for installing a non-magnetic ultrasonic motor, a meshing transmission wheel and a gear are provided on the rear fixing plate 7-2, the shafts on both sides of the non-magnetic ultrasonic motor are respectively connected to the gears and the non-magnetic encoder, a push rod is provided in the hollow cavity of the non-magnetic keel, one end of the push rod is connected to the transmission wheel, and the other end of the push rod passes through the front fixing plate 7-1 and extends out of the front shell 1 to be connected to the syringe.

[0028] Specifically, the non-magnetic ultrasonic motor includes an upper stator, a lower stator, an upper stator mounting seat, a lower stator mounting seat and a shell. The bottom of the upper stator and the lower stator are plated with piezoelectric ceramic material. The upper stator and the lower stator are each equipped with an interface circuit board for external voltage signal input to drive the motor movement. The interface circuit board is welded with an FPC circuit, and the other side of the circuit is welded to the piezoelectric ceramics of the upper stator and the lower stator. The external voltage passes through the interface circuit board to give the control voltage to the piezoelectric ceramics. The piezoelectric ceramics cause the stator to deform due to the inverse piezoelectric effect, thereby driving the rotor to rotate. The two stators and their stator mounting seats are locked by copper screws. The rotor is in close contact with the upper stator and the lower stator, and friction material is pasted on the rotor to increase its service life.

[0029] The above technical solution is adopted, and the power source adopts a non-magnetic ultrasonic motor. The driving principle of this non-magnetic ultrasonic motor is based on the inverse piezoelectric effect of ceramics rather than the electromagnetic effect of traditional motors. It can achieve large torque output without an electromagnetic field. In addition, through the internal structure of the shell with a non-magnetic metal paint surface attached to the inside, the non-magnetic keel, the non-magnetic ultrasonic motor, and the non-magnetic encoder, the precise high-voltage injection function without magnetic interference in an ultra-high field strength environment is realized, which can be well adapted to ultra-high magnetic field strength (especially 5.0T and above magnetic field), meeting the requirements of non-magnetization, high stability and precise control. Example 2

[0030] like Figure 1-3 As shown, this embodiment provides a non-magnetized high-pressure injector for use under ultra-high field strength, including a front shell 1, an upper shell 2, a lower shell 3, a non-magnetic keel, two non-magnetic ultrasonic motors and two non-magnetic encoders. The front shell 1, upper shell 2 and lower shell 3 of the high-pressure syringe are all ABS plastic shells and are attached with non-magnetic metal paint surfaces inside. The front shell 1, upper shell 2 and lower shell 3 constitute a non-magnetic shielding cavity, in which a hollow non-magnetic keel is arranged, and a buckle 9 connected to the left and right ends of the upper shell 2 is arranged below the non-magnetic keel, and a front fixing plate 7-1 and a rear fixing plate 7-2 are respectively arranged on the front and rear sides of the non-magnetic keel, the front fixing plate 7-1 is connected to the front shell 1, and the rear fixing plate 7-2 is connected to the mounting frame for installing the non-magnetic ultrasonic motor, and a meshing transmission wheel and gear are arranged on the rear fixing plate 7-2, and the shafts on both sides of the non-magnetic ultrasonic motor are respectively connected to the gears and the non-magnetic encoder, and a push rod is arranged in the hollow cavity of the non-magnetic keel, one end of the push rod is connected to the transmission wheel, and the other end of the push rod passes through the front fixing plate 7-1 and extends out of the front shell 1 to be connected to the syringe.

[0031] In this embodiment, the non-magnetic metal paint surface includes an inner paint surface and an outer paint surface, the inner paint surface is a metal copper spray paint with a thickness of 0.5 mm, and the outer paint surface is a varnish with a thickness of 25 um.

[0032] In this embodiment, a non-magnetic metal sealing conductive rubber ring is provided at the connection between the upper shell 2 and the lower shell 3, and a circle of non-magnetic metal sealing conductive rubber ring is attached to the edge of the front shell 1.

[0033] In this embodiment, the lower housing 3 is provided with a groove for accommodating the non-magnetic metal sealing conductive rubber ring.

[0034] Specifically, the width of the non-magnetic metal sealed conductive rubber ring is 6mm, the thickness is 0.5mm, and the internal conductive medium is glass silver-plated material. The rubber ring can be embedded in the groove of the lower shell 3. When the upper shell 1 and the lower shell 2 are installed, the force is applied to form a conductive effect, thereby connecting the front shell 1 and the conductive paint inside the upper shell 2 and the lower shell 3, and finally forming a complete shielding cavity.

[0035] In this embodiment, the non-magnetic keel includes a left keel 4-1 and a right keel 4-2 arranged in a stepped manner, and the upper step surface 14-1 of the left keel 4-1 and the right keel 4-2 is arranged to face outward, and the width of the upper step surface 14-1 is smaller than the lower step surface 14-2. A protrusion 14-3 extends downward on the inner side of the lower step surface 14-2 of the left keel 4-1 and the right keel 4-2, and threaded holes 14-4 connected to the front fixing plate 7-1 and the rear fixing plate 7-2 are provided at both ends of the protrusion 14-3 and the upper step surface 14-1.

[0036] Specifically, there are four protrusions 14-3 distributed on the front and rear sides of the left keel 4-1 and the right keel 4-2. The protrusion 14-3 close to the rear fixing plate 7-2 and the protrusion 14-3 close to the front fixing plate 7-1 are flush with the two ends of the upper step surface 14-1 of the left keel 4-1 and the right keel 4-2 respectively.

[0037] In this embodiment, the mounting frames are symmetrically arranged in an L shape on both sides of the rear fixing plate 7-2 corresponding to the left keel 4-1 and the right keel 4-2, and the vertical side surfaces of the mounting frames on both sides are provided with buckles 9 that cooperate with the upper shell.

[0038] Specifically, the mounting frame includes a left mounting frame 8-1 and a right mounting frame 8-2. The left non-magnetic ultrasonic motor 5-1 is installed on the left mounting frame 8-1. One side of the left non-magnetic ultrasonic motor 5-1 is connected to the left non-magnetic encoder 6-1. The other side of the left non-magnetic ultrasonic motor 5-1 is connected to the left gear 13-1. The left gear 13-2 is meshed with the left transmission wheel 12-1. The left transmission wheel 12-1 is connected to the left push rod 10-1 located in the left keel 4-1, driving the left push rod 10-1. 1 moves in the left needle cylinder 11-1, a right non-magnetic ultrasonic motor 5-2 is installed on the right mounting frame 8-2, one side of the right non-magnetic ultrasonic motor 5-2 is connected to the right non-magnetic encoder 6-2, the other side of the right non-magnetic ultrasonic motor 5-2 is connected to the right gear 13-2, the right gear 13-2 is meshed with the right transmission wheel 12-2, the right transmission wheel 12-2 is connected to the right push rod 10-2 located in the right keel 4-2, and drives the right push rod 10-2 to move in the right needle cylinder 11-2.

[0039] In this embodiment, the upper and middle corners of the lower step surfaces 14-2 of the left keel 4-1 and the right keel 4-2 near the rear fixing plate 7-2 are recessed toward the front fixing plate 7-1, and the recessed position is used to install a potentiometer for calculating the movement distance of the push rod.

[0040] In this embodiment, the upper step surface 14-1 of the left keel 4-1 extends outward with a flush fixing block 14-5, and there are two fixing blocks 14-5. The two fixing blocks 14-5 are provided with threaded holes connected to the non-magnetic bent pipe (not shown) provided on one side of the upper shell 2 and the lower shell 3.

[0041] In this embodiment, the shells of the non-magnetic ultrasonic motor and the non-magnetic encoder are both made of aluminum alloy.

[0042] Specifically, the non-magnetic ultrasonic motor drive ground wire and the shielded shell ground wire are separated. The shielding layer of the non-magnetic ultrasonic motor drive cable is led out and locked on the motor shell by copper screws. The non-magnetic encoder shell is also made of aluminum alloy material and is locked on the motor shell by peek material screws.

[0043] In this embodiment, the upper shell 2 and the lower shell 3, the non-magnetic keel and the front fixing plate 7-1 and the rear fixing plate 7-2, and the non-magnetic ultrasonic motor and the rear fixing plate 7-2 are all fixedly connected by copper screws.

[0044] After the right non-magnetic ultrasonic motor 5-2 and the left non-magnetic ultrasonic motor 5-1 are powered on, the motors drive the right transmission wheel 12-2 and the left transmission wheel 12-1 through gear meshing. The right transmission gear 12-2 is connected to the right push rod 10-2, and the left transmission wheel 12-1 is connected to the left push rod 10-1. The right transmission wheel 12-2 drives the right push rod 10-2 forward or backward, and the left transmission wheel 12-1 drives the left push rod 10-1 forward or backward. The right push rod 10-2 is connected to the piston of the right syringe 11-2, and the left push rod 10-1 is connected to the piston of the left syringe 11-1. Finally, the pistons of the right syringe 11-2 and the left syringe 11-1 move forward and backward, thereby achieving the purpose of injecting and inhaling medicine for the patient.

[0045] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention.

Claims

1. A non-magnetized high-pressure injector for use under ultra-high field strength, characterized in that: It includes a non-magnetic shielding cavity consisting of a front shell with a non-magnetic metal paint surface attached to the inside, an upper shell and a lower shell. A hollow non-magnetic keel is arranged in the non-magnetic shielding cavity. The non-magnetic keel is connected to the left and right ends of the upper shell by snap-fitting. A front fixing plate and a rear fixing plate are respectively arranged on the front and back sides of the non-magnetic keel. The front fixing plate is connected to the front shell, and the rear fixing plate is connected to a mounting frame for installing a non-magnetic ultrasonic motor. A meshing transmission wheel and gear are arranged on the rear fixing plate. The shafts on both sides of the non-magnetic ultrasonic motor are respectively connected to gears and a non-magnetic encoder. A push rod is arranged in the hollow cavity of the non-magnetic keel. One end of the push rod is connected to the transmission wheel, and the other end of the push rod passes through the front fixing plate and extends out of the front shell to be connected to the syringe.

2. The non-magnetized high-pressure injector for ultra-high field strength according to claim 1, characterized in that: The front shell, the upper shell and the lower shell are all ABS plastic shells.

3. The non-magnetized high-pressure injector for ultra-high field strength according to claim 1, characterized in that: The non-magnetic metal paint surface includes an inner paint surface and an outer paint surface, the inner paint surface is a metal copper spray paint with a thickness of 0.5 mm, and the outer paint surface is a varnish with a thickness of 25 um.

4. The non-magnetized high-pressure injector for ultra-high field strength according to claim 1, characterized in that: A non-magnetic metal sealing conductive rubber ring is provided at the connection between the upper shell and the lower shell, and a circle of non-magnetic metal sealing conductive rubber ring is attached to the edge of the front shell.

5. The non-magnetized high-pressure injector for use under ultra-high field strength according to claim 4, characterized in that: The lower shell is provided with a groove for accommodating a non-magnetic metal sealing conductive rubber ring.

6. The non-magnetized high-pressure injector for ultra-high field strength according to claim 1, characterized in that: The non-magnetic keel includes a left keel and a right keel arranged in a stepped manner, the upper step surfaces of the left keel and the right keel are arranged to face outward, the width of the upper step surface is smaller than the lower step surface, and a protrusion extends downward on the inner side of the lower step surface of the left keel and the right keel, and the protrusion and the upper step surface are provided with threaded holes connected to the front fixing plate and the rear fixing plate.

7. The non-magnetized high-pressure injector for use under ultra-high field strength according to claim 5, characterized in that: The mounting frames are symmetrically arranged on both sides of the rear fixing plate in an L shape corresponding to the left keel and the right keel, and the vertical side surfaces of the mounting frames on both sides are provided with buckles that cooperate with the upper shell.

8. The non-magnetized high-pressure injector for use under ultra-high field strength according to claim 5, characterized in that: The middle upper corners of the lower step surfaces of the left keel and the right keel close to the rear fixing plate are recessed toward the front fixing plate, and the recessed position is used to install a potentiometer for calculating the movement distance of the push rod.

9. The non-magnetized high-pressure injector for use under ultra-high field strength according to claim 1, characterized in that: The shells of the non-magnetic ultrasonic motor and the non-magnetic encoder are both aluminum alloy shells.

10. The non-magnetized high-pressure injector for use under ultra-high field strength according to claim 1, characterized in that: The upper shell and the lower shell, the non-magnetic keel and the front fixing plate, the rear fixing plate, the non-magnetic ultrasonic motor and the rear fixing plate are all fixedly connected by copper screws.

Images