Quantitative injection device for radioactive medicament in nuclear medicine department

Abstract

The quantitative injection device structurally comprises an injection cylinder, a piston shaft, a finger hooking part, scale marks, a pressing handle, a needle sleeve and a needle head, a sliding block can slide up and down on the side face of a cylinder pipe, a sinking strip is squeezed while sliding, a plastic plate is ejected out by an arc-shaped plate to be bent inwards, and therefore it can be known that the quantitative injection device is convenient to use. The plastic plate is bent inwards in an arc mode to damage the circular state of the inner side of the tube, then when the piston shaft pushes the medicine in the tube, the medicine is blocked by the inwards-bent part of the plastic plate, and therefore the medicine in the tube is pushed to flow from the inside of the flow opening to the needle head by manually pressing the piston shaft through the pressing hand, and the lowermost end of the piston shaft is blocked by the plastic plate extruded by the sliding block. Further, the pushed volume of the medicament is the height of the sliding block, and the sliding block slides by the height by aligning the indicating line with the scale line, so that the sliding block slides according to the injection amount of the medicament, accurate quantitative injection is realized, and the situation that the injection amount is too large or too small easily caused by hand pushing is prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of injection devices, and more specifically, to a quantitative injection device for radiopharmaceuticals in nuclear medicine. Background Art

[0002] Nuclear medicine uses nuclear science and technology and means to diagnose and treat diseases. It is one of the main means of modern medicine. The nuclear medicine department is one of the main medical and technical departments of the hospital. It mainly carries out nuclear medicine examination projects. It is an effective means to assist clinical departments in making correct diagnosis of diseases. In the examination projects, radioactive agents are needed to image the bones. After intravenous injection of radioactive agents, they reach the bones throughout the body through blood circulation. The imaging agents need to be injected in a quantitative manner according to the different conditions of the human body, so that the agents are concentrated in the bone tissue, which is convenient for subsequent CT and other radioactive irradiation examinations.

[0003] However, injection devices usually require manual injection. When pushing the medicine into the vein, the different pressures in the injection needle and the human blood vessels will produce a certain resistance, and then the pushing will form resistance. The hand is prone to shaking during injection, resulting in uneven injection force. In addition, the quantitative measurement of existing syringe injection is based on observing the syringe scale. When there is too much medicine in the syringe and only a part of it needs to be injected, it is necessary to always observe the amount pushed to ensure that the injection is stopped. When the injection is stopped, due to the pressure in the medicine, the piston no longer produces pushing pressure on the medicine when it stops, and then the piston is easy to loosen and move forward or backward again under the pressure of the medicine. Therefore, the amount of injected medicine is prone to be too much or too little, which can easily cause inaccurate quantitative measurement when injecting medicine. Summary of the invention

[0004] The technical solution adopted by the present invention to achieve the technical purpose is: a quantitative injection device for radiopharmaceuticals in nuclear medicine, whose structure includes a syringe, a piston shaft, a finger hook, a scale line, a button, a needle sleeve, and a needle. The button is embedded in the upper end of the piston shaft, the outer side of the piston shaft is fixed to the upper end of the syringe, and the lower end of the piston shaft is sealed and movable inside the syringe. The syringe includes a barrel and an adjustment member that slides on the inside, and the syringe also includes a bottom block that is engaged with the needle. A flow port is passed through the middle of the bottom block, and the bottom of the flow port and the middle of the needle are in a passage state. The finger hook is extended to the outer side of the upper end of the syringe, and the two finger hooks are horizontally symmetrical with each other on the left and right sides of the syringe. The scale line is laser engraved on the outer surface of the syringe, and the needle is engaged at the lower end of the syringe and is wrapped by the needle sleeve.

[0005] The adjusting member is provided with a slider which slides in a limiting groove, and the two limiting grooves are distributed on the inner side of the bobbin on the left and right sides. The left and right sides of the slider move in a clearance in the limiting grooves. The sinking bar is embedded in the inner side of the bobbin. When the slider is in a stationary state, the inner end of the slider presses against the outer side of the sinking bar, and the sinking bar elastically squeezes the slider in the opposite direction. The slider includes an arc block and square bars on both sides. The arc plate is located in the middle position of the indicating line and is opposite to the scale line. The balls are respectively arranged and engaged with the outer sides of the two square bars and slide in the limiting grooves. The two ends of the inner side of the arc plate are respectively installed on the inner side of the arc block, and the arc of the outer side of the arc plate presses against each other in the direction of the outer side of the sinking bar.

[0006] The bottom block is provided with a sunken groove having the same shape as the adjusting member at a position directly below the adjusting member. After the sliding block is pushed to the position of the sunken groove, the sliding block does not abut against the sunken strip.

[0007] The two sides of the arc plate are in arc state and have a certain sliding force. After the arc plate is ejected and matched with the plastic plate, when it is manually moved again, the two sides of the arc plate slide with the side of the support plate, and the arc plate squeezes the plastic plate next to it to eject and match it.

[0008] As a further improvement of the present invention, the immersion strip includes a support plate and a rubber plate installed on the inner side of the barrel, the side of the rubber plate is fitted to the side of the support plate, and the inner side of the plastic plate is fitted to the outer side of the rubber plate, the immersion strip is provided with two first springs embedded in the upper and lower first springs, and the four first springs on each plastic plate are symmetrically installed on the inner side of the barrel, the support plate and the rubber plate are vertically spaced and arranged in the barrel, and the spacing distance between every two rubber plates is the milliliter height of the inner volume of the barrel.

[0009] The first spring is in a fixed state. When the plastic plate is pushed out by the arc plate and bends toward the rubber plate, the first spring generates an elastic force on the plastic plate to pull it outward. Since the plastic plate is supported by the plastic plate, the plastic plate bends against the rubber plate and stretches the rubber plate at the same time, so that the plastic plate bends inward in an arc shape to destroy the circular state of the inner side of the barrel.

[0010] As a further improvement of the present invention, a magnet is provided on the outer side of each plastic plate and is engaged with the outer top, and the outer side of the magnet abuts against the arc top of the arc plate, and when the arc plate is stationary, it attracts the magnet and fits and fixes.

[0011] As a further improvement of the present invention, the piston shaft is provided with a piston block and a fixed plate located on the same central axis, and the fixed plate is threadedly fixed to the upper end of the barrel by a threaded ring, a rubber piston made of soft material is provided under the piston block, and the rubber piston is sealed and movable with the inner side of the barrel when pushed by the piston block, the lower end of the push rod passes through the fixed plate and is fixed to the middle surface of the piston block, the upper end of the push rod is embedded with a button, and the button pushes the push rod to move in the fixed plate.

[0012] As a further improvement of the present invention, the fixed plate includes a horizontal block fixed inside the upper end of the bobbin, the gap groove is located in the middle position of the horizontal block and is penetrated by the push rod, the four rollers are distributed in an annular manner on the inner side of the horizontal block and movably cooperate with the outer side of the push rod, the gap groove is an overlapping shape of a "cross" around the middle circle, and the shape of the gap groove is slightly larger than the push rod so that clearance can be made between them.

[0013] The roller includes a second spring installed at an angle downward, the outer end of the second spring is embedded in the inner side of the horizontal block, and two second springs are installed on the side of the elliptical rod in one of the rollers. The rubber ring is in rolling friction cooperation with the outer side of the elliptical rod, and the rubber ring is in contact with the outer side of the push rod in the middle position of the gap groove.

[0014] The second spring supports the elliptical rod in a state of being inclined at 45 degrees. When the rubber ring rolls on the outside of the elliptical rod, the second spring generates elastic support for the elliptical rod, and the rubber ring rolls and frictionally cooperates with the outside of the push rod. Beneficial Effects

[0015] 1. The slider in the present invention can slide up and down on the side of the barrel, and squeeze the embedded strip while sliding, so that the plastic plate is pushed out by the arc plate and bends inwardly. It can be seen that the inward arc bending of the plastic plate destroys the circular state of the inner side of the barrel, and then when the piston shaft pushes the medicine in the barrel, it is blocked by the inward bent part of the plastic plate. Therefore, the piston shaft is manually pressed by the hand to push the medicine in the barrel to flow from the flow port to the needle, and the lower end of the piston shaft is blocked by the plastic plate squeezed by the slider, and then the volume of the medicine pushed out is based on the height of the slider. The slider slides to a certain height by aligning the scale line with the indicator line. Therefore, the slider height is slid according to the injection amount of the medicine, so as to achieve accurate quantitative injection and prevent the hand from pushing and causing excessive or insufficient injection.

[0016] 2. In the present invention, the push rod is pressed at the hand position, and then the piston block pushes the rubber piston in the barrel to push out the medicine injection, and when the push rod is manually pushed, the push rod rubs against the rubber ring at the gap groove position, and then when the push rod moves, it contacts the rubber ring and drives the rubber ring to roll outside the elliptical rod. At the same time, under the elastic pressure of the second spring, the push rod is elastically supported when pushed, and when the driving force fluctuates, the second spring elastically blocks the push rod, combined with the rolling contact of the rubber ring, so that the push rod maintains a uniform speed of pushing, preventing the push from being too fast or too slow, so that the hand can stably push for injection. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The present invention is a schematic structural diagram of a quantitative injection device for radiopharmaceuticals in nuclear medicine.

[0018] Figure 2 It is a schematic diagram of the cross-sectional three-dimensional structure of a syringe barrel of the present invention.

[0019] Figure 3 The figure is a schematic diagram of the planar structure of an adjusting member of the present invention.

[0020] Figure 4 The figure is a schematic diagram of the three-dimensional structure of a slider according to the present invention.

[0021] Figure 5 It is a three-dimensional structural schematic diagram of a sinking strip of the present invention.

[0022] Figure 6 The figure is a schematic diagram of a three-dimensional structure of a curved plate and a plastic plate in cooperation with each other according to the present invention.

[0023] Figure 7 The figure is a schematic diagram of the three-dimensional structure of a plastic plate of the present invention.

[0024] Figure 8 The figure is a schematic diagram of the three-dimensional structure of a piston shaft of the present invention.

[0025] Fig. 9 The figure is a schematic diagram of the three-dimensional structure of a fixing plate of the present invention.

[0026] Fig.10 The figure is a schematic diagram of the three-dimensional structure of a roller according to the present invention.

[0027] In the figure: syringe 1, piston shaft 2, finger hook 3, scale line 4, button 5, needle sleeve 6, needle 7, barrel 11, adjustment member 12, flow port 13, bottom block 14, slider 121, sinking bar 122, limiting groove 123, arc block 1211, square bar 1212, indicator line 1213, arc plate 1214, ball 1215, support plate 1221, rubber plate 1222, first spring 1223, plastic plate 1224, magnet 224.

[0028] Threaded ring 21, rubber piston 22, push rod 23, fixing plate 24, piston block 25, roller 241, horizontal block 242, gap groove 243, rubber ring 411, elliptical rod 412, second spring 413. DETAILED DESCRIPTION

[0029] The present invention is further described below in conjunction with the accompanying drawings: As attached Figure 1 To Attachment Fig.10 As shown: The present invention discloses a quantitative injection device for radiopharmaceuticals in nuclear medicine, which structure includes a syringe 1, a piston shaft 2, a finger hook 3, a scale line 4, a hand 5, a needle sleeve 6, and a needle 7. The hand 5 is embedded in the upper end of the piston shaft 2, the outer side of the piston shaft 2 is fixed to the upper end of the syringe 1, and the lower end of the piston shaft 2 is sealed and movable inside the syringe 1. The syringe 1 includes a barrel 11 and an adjusting member 12 that is slidably matched on the inner side, and the syringe 1 also includes a bottom block 14 that is engaged with the needle 7. A flow port 13 is passed through the middle of the bottom block 14, and the lower part of the flow port 13 and the middle of the needle 7 are in a passage state. The finger hook 3 is extended to the outer side of the upper end of the syringe 1, and two finger hooks 3 are on the left and right sides of the syringe 1. They are horizontally symmetrical with each other, and the scale lines 4 are laser engraved on the outer surface of the syringe barrel 1. The needle 7 is clamped at the lower end of the syringe barrel 1 and is wrapped by the needle sleeve 6. When the present invention is in use, the index finger and the middle finger of the hand are at the position of the two finger hooks 3, and cooperate with the thumb from the pressing hand 5 to push the piston shaft 2, so that the pressing hand 5 pushes the medicine in the barrel 11 from the flow port 13 to the needle 7 for injection into the human body. Therefore, according to the injection amount, the adjustment part 12 is manually pushed to slide on the inside of the barrel 11 to block the push of the piston shaft 2, so that the amount of medicine pushed out by the piston shaft 2 is the amount from the lower end position of the piston shaft 2 to the position of the slider 121 in the internal position of the barrel 11, thereby solving the problem of inaccurate injection amount caused by unstable shaking after the hand push.

[0030] The adjusting member 12 is provided with a slider 121 which slides in a limiting groove 123, and the two limiting grooves 123 are distributed on the inner side of the tube 11. The left and right sides of the slider 121 move in the limiting groove 123. The sinking bar 122 is embedded in the inner side of the tube 11. When the slider 121 is in a stationary state, the inner end of the slider 121 abuts against the outer side of the sinking bar 122, and the sinking bar 122 elastically squeezes the slider 121 in the reverse direction. The slider 121 includes an arc block 1211 and square bars 1212 on both sides. The arc plate 1214 is located in the middle of the indicator line 1213 and is opposite to the scale line 4. The balls 1215 are arranged and engaged on the outer sides of the two square bars 1212 and the inner sides of the limiting grooves 123 for sliding cooperation. The two ends of the inner side of the arc plate 1214 are respectively installed on the inner sides of the arc block 1211, and the arcs on the outer sides of the arc plate 1214 press against each other in the outer direction of the sunken bars 122. In the present invention, the square bars 1212 slide in the limiting grooves 123 in the barrel 11. After the sliding stops, the arc plate 1214 and the sunken bars 122 are fixed by the pressure of pressing against each other when they are stationary, thereby providing a fixed resistance for blocking the piston shaft 2, thereby ensuring that the slider 121 will not be displaced and pushed after the sunken bars 122 block the piston shaft 2.

[0031] Among them, the bottom block 14 is provided with an inner recessed groove with the same shape as the adjusting member 12 just below the adjusting member 12. After the slider 121 is pushed to the position of the inner recessed groove, the slider 121 does not abut against the sinking strip 122. Therefore, when all the medicine in the barrel 11 is pushed, the slider 121 does not abut against the sinking strip 122 to bend inward, so as not to affect the circular state inside the barrel 11.

[0032] Among them, the two sides of the arc plate 1214 are in an arc state and have a certain sliding force. After the arc plate 1214 is ejected and matched with the plastic plate 1224, when it is manually moved again, the two sides of the arc plate 1214 slide with the side of the support plate 1221, and the arc plate 1214 squeezes the plastic plate 1224 next to it to eject it. When the arc plate 1214 in the present invention is stationary, it will be blocked by the plastic plate 1224 next to it that has not been deformed. It is necessary to manually push the arc block 1211 to drive the arc plate 1214 to squeeze the side of the plastic plate 1224 so that the plastic plate 1224 can be resisted and bent inward, thereby preventing the arc plate 1214 from easily escaping from the interval between the plastic plates 1224.

[0033] The immersion strip 122 includes a support plate 1221 and a rubber plate 1222 installed on the inner side of the tube 11, the side of the rubber plate 1222 is attached to the side of the support plate 1221, and the inner side of the plastic plate 1224 is attached to the outer side of the rubber plate 1222, the immersion strip 122 is provided with a first spring 1223 embedded in the upper and lower first springs 1223, and the four first springs 1223 on each plastic plate 1224 are symmetrically installed on the inner side of the tube 11, the support plate 1221 and the rubber plate 1222 are arranged vertically and spaced apart in the tube 11, and every two The spacing distance between the rubber plates 1222 is 1 ml height of the inner volume of the barrel 11, so the width of the plastic plate 1224 is the spacing distance between the rubber plates 1222, and the width of the arc plate 1214 is larger than the width of the plastic plate 1224. At the same time, the width of the two support plates 1221 and the plastic plate 1224 is added to the width of the arc plate 1214. It can be seen that when the arc plate 1214 is stationary, it only presses and bends one plastic plate 1224 inward, and then the position where the arc plate 1214 and the plastic plate 1224 are against each other is adjusted according to the injection volume requirements, so as to adjust the effect of the blocking position.

[0034] Among them, the first spring 1223 is in a fixed state. When the plastic plate 1224 is pushed out by the arc plate 1214 and bends toward the rubber plate 1222, the first spring 1223 generates an elastic force on the plastic plate 1224 to pull it outward. Since the plastic plate 1224 is supported by the plastic plate 1224, the plastic plate 1224 bends the rubber plate 1222 while stretching the rubber plate 1222, and then the plastic plate 1224 bends inward in an arc shape to destroy the circular state of the inner side of the bobbin 11.

[0035] Among them, each plastic plate 1224 is provided with a magnet 224 engaged at the outer top, and the outer side of the magnet 224 is against the arc-shaped top of the arc plate 1214. When the arc plate 1214 is stationary, it is attracted to the magnet 224 and fixedly attached, thereby increasing the contact and attachment effect of the arc plate 1214 on the surface of the plastic plate 1224, aiming to stabilize the effect of the arc plate 1214. In the present invention, the hand pushes the slider 121 to slide up and down on the side of the barrel 11, and at the same time squeezes the sinking strip 122, so that the arc plate 1214 in the slider 121 presses against the plastic plate 1224, driving the plastic plate 1224 and the rubber plate 1222 to bend toward the inside of the barrel 11 under the elastic force of the first spring 1223. Therefore, the inward arc bending of the plastic plate 1224 destroys the circular state of the inner side of the barrel 11, forming a point protruding inward. Therefore, when the piston shaft 2 pushes the medicine in the barrel 11, it is blocked by the inward protruding point of the plastic plate 1224. It can be seen that the amount of medicine pushed out by the piston shaft 2 is the amount from the lower end position of the piston shaft 2 to the position of the slider 121 in the internal position of the barrel 11, and the slider 121 is slid according to the injection amount of the medicine to achieve quantitative injection, thereby solving the problem of inaccurate injection amount caused by unstable shaking after the hand pushes. Among them, the piston shaft 2 is provided with a piston block 25 and a fixed plate 24 located on the same central axis, and the fixed plate 24 is threadedly fixed to the upper end of the barrel 11 through a threaded ring 21, and a rubber piston 22 made of soft material is provided under the piston block 25, and the rubber piston 22 is sealed and movable with the inner side of the barrel 11 when pushed by the piston block 25, the lower end of the push rod 23 passes through the fixed plate 24 and is fixed on the middle surface of the piston block 25, the upper end of the push rod 23 is embedded with the button 5, and the button 5 pushes the push rod 23 to move in the fixed plate 24.

[0036] It is necessary to explain that in the above scheme, the fixing plate 24 is threadedly fixed to the inside of the barrel 11 by the threaded ring 21, but the threaded fixing may not be performed by the threaded ring 21, and the fixing plate 24 may be directly plugged into the inner side of the barrel 11 by interference fit. Therefore, there are two methods for installing the piston shaft 2 and the barrel 11 of the present invention. The fixing plate 24 is not plugged into the barrel 11 by interference fit, mainly because the rubber piston 22 maintains stability when pushed and translated in the barrel 11, so that the push rod 23 contacts and presses with the roller 241 at the position of the fixing plate 24, so as to stabilize the action force between the roller 241 and the push rod 23. When the fixing plate 24 is plugged into the barrel 11 by interference fit, it is convenient for the fixing plate 24 to detach from the inside of the barrel 11, and the fixing plate 24 can be directly pulled out from the barrel 11 to disassemble and separate the piston shaft 2 and the injection barrel 1. Therefore, the use of the threaded ring 21 is more conducive to the problem of stabilizing the thrust of the push rod 23 in the present invention, thereby solving the technical problems described in the background technology.

[0037] Among them, the fixed plate 24 includes a horizontal block 242 fixed inside the upper end of the bobbin 11, the gap groove 243 is located in the middle position of the horizontal block 242 and is penetrated by the push rod 23, the four rollers 241 are distributed in an annular manner on the inner side of the horizontal block 242 and are movably cooperated with the outer side of the push rod 23, the gap groove 243 is an overlapping shape of a "cross" around the middle circle, and the shape of the gap groove 243 is slightly larger than the push rod 23 and has gap movement with each other, so the four rollers 241 are evenly in contact with the outer side of the push rod 23, so that the external force of the push rod 23 is evenly applied.

[0038] Among them, the roller 241 includes a second spring 413 installed at an angle downward, the outer end of the second spring 413 is embedded in the inner side of the horizontal block 242, and two second springs 413 are installed on the side of the elliptical rod 412 in one of the rollers 241, the rubber ring 411 is rolled and frictionally matched with the outer side of the elliptical rod 412, and the rubber ring 411 and the outer side of the push rod 23 in the middle position of the gap groove 243 are pressed against each other.

[0039] The second spring 413 supports the elliptical rod 412 at an angle of 45 degrees. When the rubber ring 411 rolls outside the elliptical rod 412 , the second spring 413 generates elastic support for the elliptical rod 412 , and the rubber ring 411 rolls and frictionally engages with the outside of the push rod 23 . In the present invention, the friction between the rubber ring 411 and the outer side of the push rod 23 drives the rubber ring 411 to roll outside the elliptical rod 412. When the push rod 23 is pushed faster, the second spring 413 tilts the push rod 23, forming an effect of tilting and supporting the push rod 23 on the outer side. The intermittent rapid movement will increase the driving of the push rod 23 on the rubber ring 411, and then the second spring 413 will have elastic fluctuations. Under the elastic tilt of the second spring 413, the elliptical rod 412 and the rubber ring 411 are driven to squeeze the push rod 23, so that the squeezing force of the outer side of the push rod 23 on the rubber ring 411 becomes larger to block it. Therefore, the stability of the push rod 23 pushing the piston block 25 is maintained to prevent the hand from pushing unstably and shaking. Utilizing the technical solution of the present invention, or those skilled in the art designing similar technical solutions inspired by the technical solution of the present invention to achieve the above-mentioned technical effects, all fall within the protection scope of the present invention.

Claims

1. A quantitative injection device for radiopharmaceuticals in nuclear medicine, comprising a syringe (1), a piston shaft (2), a finger hook (3), a scale line (4), a hand (5), a needle sleeve (6), and a needle (7), characterized in that: The handle (5) is embedded in the upper end of the piston shaft (2), the outer side of the piston shaft (2) is fixed to the upper end of the syringe (1), and the lower end of the piston shaft (2) is sealed and movable inside the syringe (1), the syringe (1) comprises a barrel (11) and an adjusting member (12) slidably matched on the inner side, and the syringe (1) also comprises a bottom block (14) engaged with the needle (7), a flow port (13) is passed through the middle of the bottom block (14), and the lower part of the flow port (13) and the middle of the needle (7) are in a passage state, the finger hook part (3) is extended to the outer side of the upper end of the syringe (1), and the two finger hook parts (3) are horizontally symmetrical with each other on the left and right sides of the syringe (1), the scale line (4) is laser engraved on the outer surface of the syringe (1), and the needle (7) is engaged with the lower end of the syringe (1) and is covered and wrapped by the needle sleeve (6); The adjusting member (12) is provided with a slider (121) which slides in a limiting groove (123), and the two limiting grooves (123) are distributed on the left and right sides of the inner side of the bobbin (11). The left and right sides of the slider (121) move in a clearance in the limiting groove (123), and the sinking strip (122) is embedded in the inner side of the bobbin (11). When the slider (121) is in a stationary state, the inner end of the slider (121) abuts against the outer side of the sinking strip (122), and the sinking strip (122) generates elastic extrusion on the slider (121) in the reverse direction.

2. A quantitative injection device for radiopharmaceuticals in nuclear medicine according to claim 1, characterized in that: The slider (121) comprises an arc block (1211) and square bars (1212) on both sides; the arc plate (1214) is located in the middle of the indicator line (1213) and opposite to the scale line (4); the balls (1215) are arranged and snap-fitted to the outside of the two square bars (1212) and the inside of the limit groove (123) for sliding cooperation; the two ends of the inner side of the arc plate (1214) are respectively mounted on the inner side of the arc block (1211), and the arcs on the outer side of the arc plate (1214) are pressed against each other in the direction of the outer side of the bar (122); The bottom block (14) is provided with a sunken groove having the same shape as the adjusting member (12) at a position directly below the adjusting member (12); after the sliding block (121) is pushed to the position of the sunken groove, the sliding block (121) does not abut against the sunken strip (122).

3. A quantitative injection device for radiopharmaceuticals in nuclear medicine according to claim 1, characterized in that: The immersion strip (122) comprises a support plate (1221) and a rubber plate (1222) mounted on the inner side of the barrel (11); the side of the rubber plate (1222) is fitted on the side of the support plate (1221), and the inner side of the plastic plate (1224) is fitted on the outer side of the rubber plate (1222); the immersion strip (122) is provided with a first spring (1223) embedded in two upper and lower first springs (1223), and the four first springs (1223) on each plastic plate (1224) are symmetrically mounted on the inner side of the barrel (11); the support plate (1221) and the rubber plate (1222) are arranged vertically and spaced apart in the barrel (11), and the spacing between each two rubber plates (1222) is 1 ml of the inner volume of the barrel (11).

4. A quantitative injection device for radiopharmaceuticals in nuclear medicine according to claims 1-3, characterized in that: A magnet (224) is provided on the outside of each plastic plate (1224) and is engaged with the top of the outside, and the outside of the magnet (224) abuts against the arc-shaped top of the arc-shaped plate (1214). When the arc-shaped plate (1214) is stationary, it attracts the magnet (224) and is fixed in place.

5. A quantitative injection device for radiopharmaceuticals in nuclear medicine according to claim 1, characterized in that: The piston shaft (2) is provided with a piston block (25) and a fixing plate (24) located on the same central axis, and the fixing plate (24) is threadedly fixed to the interior of the upper end of the tube (11) through a threaded ring (21). A rubber piston (22) made of soft material is provided below the piston block (25), and the rubber piston (22) is sealed and movable with the inner side of the tube (11) when pushed by the piston block (25). The lower end of the push rod (23) passes through the fixing plate (24) and is fixed to the middle surface of the piston block (25). The upper end of the push rod (23) is embedded with the pressing hand (5), and the pressing hand (5) pushes the push rod (23) to move and cooperate in the fixing plate (24).

6. A quantitative injection device for radiopharmaceuticals in nuclear medicine according to claim 5, characterized in that: The fixed plate (24) comprises a horizontal block (242) fixed inside the upper end of the bobbin (11); the gap groove (243) is located in the middle of the horizontal block (242) and is penetrated by the push rod (23); the four rollers (241) are distributed in an annular manner on the inner side of the horizontal block (242) and are movably matched with the outer side of the push rod (23); the gap groove (243) is in the shape of a cross with a central circle on all sides, and the shape of the gap groove (243) is slightly larger than the push rod (23) so that they can move with each other.

7. A quantitative injection device for radiopharmaceuticals in nuclear medicine according to claim 6, characterized in that: The roller (241) includes a second spring (413) installed in a downward tilted manner, the outer end of the second spring (413) is embedded in the inner side of the horizontal block (242), and two second springs (413) are installed on the side of the elliptical rod (412) in one of the rollers (241), the rubber ring (411) and the outer side of the elliptical rod (412) are in rolling friction cooperation, and the rubber ring (411) and the outer side of the push rod (23) at the middle position of the gap groove (243) are mutually pressed.

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