A radiopharmaceutical containment injection device

Abstract

The application relates to the technical field of medicine injection, and particularly discloses a protective injection device for radioactive medicine, which comprises an extension pipe and a cylinder made of radiation shielding material, one end of the cylinder is provided with a cylindrical slot, a through hole is arranged at the middle position of the bottom of the cylindrical slot, a ring-shaped cover is arranged on the middle part of the outer side of the extension pipe, the two sides of the cover are respectively fixedly connected with the outer side of the extension pipe, an opening is arranged in the inner wall of the extension pipe and communicates with the inner cavity of the cover, a sliding hole is arranged on the outer side of the cylinder and close to the bottom of the cylindrical slot, and a moving block which can seal sliding is arranged on the sliding hole, the technical scheme of the example of the application can accurately control the injection amount of the radioactive medicine, reduces the waste of the radioactive medicine, when the hand of a medical staff approaches the needle, there is no radioactive medicine in the needle, and the radiation dose received by the hand of the medical staff is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medicine injection, in particular to a protective injection device for radioactive medicine. BACKGROUND

[0002] Radioactive medicine is widely used in the diagnosis and treatment of medical field. The injection dose of radioactive medicine is accurately calculated to ensure that the benefit is much greater than the risk. In diagnosis, radioactive medicine non-invasively reveals the physiological, biochemical function and disease state of the body, providing important early diagnosis and accurate staging information. In treatment, radioactive medicine delivers high-energy radiation to diseased tissues (such as tumors, abnormal glands), destroys diseased cells from the inside, and achieves efficient and relatively low-toxicity treatment effect.

[0003] The existing injection of radioactive medicine is mostly performed by setting a radioactive shielding tube on the syringe to shield the radioactive radiation of the syringe. However, the radioactive radiation shielding cannot cover the needle of the syringe. During the injection process, the hands of medical staff need to approach the needle of the syringe, such as pulling out the needle, replacing the needle, and discarding the needle. A certain dose of radioactive medicine is likely to remain in the needle, which becomes the main risk source of occupational radioactive exposure of medical staff. SUMMARY

[0004] The technical problem to be solved by the present application is to overcome the existing defects and provide a protective injection device for radioactive medicine. The injection amount of radioactive medicine is accurately controlled, the waste of radioactive medicine is reduced, and when the hands of medical staff approach the needle, there is no radioactive medicine in the needle, thereby reducing the radiation dose received by the hands of medical staff.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a protective injection device for radioactive medicine, comprising an extension tube and a cylinder body made of radiation shielding material, one end of the cylinder body is provided with a cylindrical slot, a through hole is formed in the middle of the bottom of the cylindrical slot, an annular shell is sleeved on the middle of the outer side of the extension tube, the two sides of the shell are respectively fixedly connected with the outer side of the extension tube, an opening is formed in the inner wall of the extension tube, which communicates with the inner cavity of the shell, a sliding hole is formed on the outer side of the cylinder body near the bottom of the cylindrical slot, and a moving block that slides sealingly is installed on the sliding hole.

[0006] Among them, the outer diameter of the shell is the same as the inner diameter of the cylindrical slot.

[0007] Among them, the inner cavity of the shell is filled with sterile injection liquid, one end of the extension tube is connected with the connecting pipe of the syringe body, the syringe body drives the extension tube to be inserted into the cylindrical slot of the cylinder body, the end of the extension tube away from the syringe body penetrates through the through hole and is connected with the needle, and the flange of the syringe body abuts against the cylinder body.

[0008] As a preferred technical scheme of the present application, the extension pipe comprises an outer extension section, a tapered section and an inner extension section, the outer diameter of the outer extension section, the inner diameter of the inner extension section and the outer diameter of the connecting pipe of the syringe body are equal, one end of the outer extension section and one end of the inner extension section are connected through the tapered section, and the opening is arranged on the inner wall of the inner extension section.

[0009] The inner extension section is provided with an inner pipe, the inner pipe is provided with a blocking block in the inner cavity, and the inner pipe is provided with a plurality of protrusions close to the syringe body.

[0010] Before the connecting pipe of the syringe body is clamped in the inner extension section, the inner pipe blocks the opening on the inner extension section.

[0011] After the connecting pipe of the syringe body is clamped in the inner extension section, the protrusions of the inner pipe are aligned with the opening on the inner extension section, and the inner cavity of the cover and the inner cavity of the inner extension section are communicated.

[0012] As a preferred technical scheme of the present application, the cylinder is provided with two radiation shielding material half-circular cover plates which are rotatably installed outside the cylinder close to the cylindrical slot, the middle part of the rotating rod is rotatably connected to the outer side of one of the half-circular cover plates, one end of the rotating rod is fixed with an elastic block, and the outer side of the half-circular cover plate is fixed with an elastic element for driving the rotating rod to rotate.

[0013] When the two half-circular cover plates are rotated to open, the syringe body is inserted into the cylindrical slot of the cylinder.

[0014] When the two half-circular cover plates are rotated to close, the push rod of the syringe body is located between the two half-circular cover plates, the two half-circular cover plates are provided with clamping grooves matched with the push rod of the syringe body, and the elastic block is bent to abut against the push rod of the syringe body.

[0015] The elastic block is driven to rotate by the rotating rod, so that the elastic block and the push rod of the syringe body are separated from the bent abutting state, and the elastic potential energy of the elastic element is increased.

[0016] As a preferred technical scheme of the present application, the elastic element is an elastic metal sheet, one end of the elastic metal sheet is fixed to the outer side of the half-circular cover plate, and the other end of the elastic metal sheet abuts against the rotating rod.

[0017] As a preferred technical scheme of the present application, the inner diameter of the through hole on the cylinder is larger than the outer diameter of the outer extension section, and the blocking block is made of radiation shielding material.

[0018] As a preferred technical scheme of the present application, the blocking block is a spherical body, and the inner wall of the tapered section is provided with a plurality of grooves.

[0019] As a preferred technical scheme of the present application, an elastic limiting block is fixed to the outer side of the barrel near the moving block.

[0020] As a preferred technical scheme of the present application, a connecting rope is further included, and two ends of the connecting rope are fixedly connected with the elastic limiting block and the moving block, respectively.

[0021] As a preferred technical scheme of the present application, a long hole is formed in the length direction of the outer side of the barrel, and a radiation-proof lead glass is fixedly installed in the long hole.

[0022] As a preferred technical scheme of the present application, the barrel is made of tungsten alloy material or lead material.

[0023] Compared with the prior art, the present application has the following beneficial effects:

[0024] 1. The radioactive drug protection type injection device of the present application can accurately control the injection amount of the radioactive drug, reduce the waste of the radioactive drug, and when the hand of a medical staff needs to approach the needle during the operation process, there is no radioactive drug in the needle, thereby reducing the radiation dose received by the hand of the medical staff.

[0025] 2. The radioactive drug protection type injection device of the present application can use the sterile injection liquid in the inner cavity of the cover shell to exhaust the needle and empty the radioactive drug in the needle, thereby reducing the radiation exposure risk of the medical staff. On the other hand, when the device is placed or transferred and is accidentally collided, the blocking block in the inner tube increases the pushing force required for the push rod to move into the needle cylinder, avoids the radioactive drug in the syringe body from flowing into the extension tube, reduces the risk of leakage of the radioactive drug in the syringe body, and improves the safety of the device. On the other hand, the blocking block is made of radiation shielding material, thereby reducing the radiation intensity at the needle.

[0026] 3. The radioactive drug protection type injection device of the present application can avoid the radioactive drug in the syringe body from leaking, improve the safety of the device, and increase the friction between the push rod and the elastic block when the device is placed or transferred and is accidentally collided and the push rod of the syringe body is impacted in the direction of the needle cylinder, the push rod moves into the needle cylinder, the push rod makes the bending deformation of the elastic block larger, the elastic block generates greater elastic reaction force, the friction between the push rod and the elastic block of the syringe body is increased, the push rod is prevented from moving into the needle cylinder, the risk of leakage of the radioactive drug in the syringe body is reduced, and the safety of the device is improved.

[0027] 4. The radioactive drug protection type injection device of the present application can avoid the outer extension segment from contacting the inner wall of the barrel when the outer extension segment passes through the through hole, thereby avoiding the inner wall of the needle from being contaminated.

[0028] 5. The protective injection device for radioactive drugs exemplified in this invention has a radiation-proof lead glass fixed inside the elongated orifice by a fusion seal or medical-grade adhesive. Medical personnel can observe the volume of the radioactive drug in the syringe, the removal of air bubbles, and the injection progress in real time through the radiation-proof lead glass to ensure the accuracy of drug administration. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of the present invention from one perspective;

[0030] Figure 2 This is a partial cross-sectional view of the present invention;

[0031] Figure 3 for Figure 2 Enlarged schematic diagram of the structure at point A;

[0032] Figure 4 This is a partial cross-sectional view of the extension tube and casing of the present invention;

[0033] Figure 5 This is a schematic diagram of the structure of the present invention from another perspective;

[0034] Figure 6 This is a schematic diagram of the semi-circular cover plate in the closed state of the present invention;

[0035] Figure 7 This is a schematic diagram of the open state of the semi-circular cover plate of the present invention.

[0036] In the diagram: 1. Needle, 2. Moving block, 3. Cylinder, 4. Radiation shielding lead glass, 5. Syringe body, 6. Long hole, 7. Extension tube, 71. Outer extension section, 72. Conical section, 73. Inner extension section, 8. Cover, 9. Opening, 10. Blocking block, 11. Internal tube, 12. Sliding hole, 13. Connecting rope, 14. Elastic limit block, 15. Semi-circular cover plate, 16. Elastic block, 17. Rotating rod, 18. Elastic component. Detailed Implementation

[0037] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0038] Example 1:

[0039] Please see Figures 1-5This embodiment discloses a protective injection device for radioactive drugs, including an extension tube 7 and a cylindrical body 3 made of radiation shielding material. One end of the cylindrical body 3 has a cylindrical slot, and a through hole is formed at the middle position of the bottom of the cylindrical slot. An annular cover 8 is fitted on the middle of the outer side of the extension tube 7. The two sides of the cover 8 are fixedly connected to the outer side of the extension tube 7. An opening 9 is formed on the inner wall of the extension tube 7, which communicates with the inner cavity of the cover 8. A sliding hole 12 is formed on the outer side of the cylindrical body 3 near the bottom of the cylindrical slot. A sliding block 2 with sealing is installed on the sliding hole 12.

[0040] The outer diameter of the cover 8 is the same as the inner diameter of the cylindrical slot.

[0041] The syringe body 5 used in this invention is a commonly used medical device in the prior art. The syringe body 5 includes a syringe barrel, a plunger and a piston. The front end of the syringe barrel is provided with a connecting tube for connecting the needle. The rear end of the syringe barrel extends outward with a flange. The flange is circular or butterfly-shaped. The syringe barrel is made of transparent medical plastic material commonly used in the prior art.

[0042] The working process and principle of this embodiment are as follows:

[0043] The inner cavity of the casing 8 is pre-filled with sterile injection liquid. Medical staff can remotely connect one end of the extension tube 7 to the connecting tube of the syringe body 5 by operating an electric robotic arm or by manually operating the extension tube while wearing radiation shielding clothing.

[0044] The medical staff pulls the movable block 2 to move it outward from the cylinder 3, and the movable block 2 does not disengage from the sliding hole 12 on the cylinder 3. The medical staff causes the syringe body 5 to drive the extension tube 7 into the cylindrical slot of the cylinder 3. The end of the extension tube 7 away from the syringe body 5 passes through the through hole and is connected to the needle 1, and the flange of the syringe body 5 abuts against the cylinder 3.

[0045] The medical staff makes the cylinder 3 vertical with the needle 1 facing upwards. The medical staff pushes the moving block 2 into the cylindrical slot of the cylinder 3. The moving block 2 squeezes the cover 8, so that the sterile injection liquid in the cover 8 flows into the extension tube 7 and the needle 1. When the sterile injection liquid flows out of the tip of the needle 1, the medical staff stops pushing the moving block 2, which completely removes the air from the extension tube 7 and the needle 1.

[0046] Medical staff insert needle 1 into the patient's vein and push the plunger of syringe body 5 to inject radioactive drugs into the patient's vein. After the radioactive drugs are injected, medical staff push moving block 2 into the cylindrical slot of cylinder 3. Moving block 2 squeezes the cover 8, causing the sterile injection liquid in cover 8 to flow into extension tube 7 and needle 1. The radioactive drugs in extension tube 7 and needle 1 are carried into the patient's vein by the sterile injection liquid, which precisely controls the amount of radioactive drugs injected and reduces waste. When the medical staff's hands need to approach needle 1 during the operation, there are no radioactive drugs in needle 1, reducing the radiation dose received by the medical staff's hands.

[0047] Preferably, an elongated hole 6 is provided on the outer side of the cylinder 3 along its length. A radiation-proof lead glass 4 is fixed inside the elongated hole 6 by fusion sealing or medical-grade adhesive. Medical personnel can observe the volume of radioactive drugs in the syringe, the removal of air bubbles, and the injection progress in real time through the radiation-proof lead glass 4 to ensure the accuracy of drug administration.

[0048] Preferably, the sterile injection fluid is Ringer's solution, physiological saline, glucose injection, or glucose sodium chloride injection.

[0049] Preferably, the cylinder 3 is made of tungsten alloy; or the cylinder 3 is made of lead, and the cylinder 3 is fixed with a paint layer or a rubber layer.

[0050] Preferably, the movable block 2 is made of tungsten alloy or lead. The connection of the present invention is by snap-fit, bonding or welding. The cover 8 is made of transparent medical soft plastic material in the prior art. The ratio of the volume of the inner cavity of the cover 8 to the volume of the inner cavity of the extension tube 7 is 10-50:1.

[0051] Furthermore, if there are a few air bubbles in the inner cavity of the cover 8, since the injection operation is mostly horizontal or inclined, the air bubbles are located at the highest point of the inner cavity of the cover 8. When the moving block 2 squeezes the cover 8, the air bubbles in the cover 8 will not enter the patient's vein.

[0052] Example 2:

[0053] like Figure 3 and Figure 4 As shown, this embodiment discloses a protective injection device for radiopharmaceuticals. Its structure is roughly the same as that of Embodiment 1. The difference is that the extension tube 7 in this embodiment includes an outer extension section 71, a tapered section 72, and an inner extension section 73. The outer diameter of the outer extension section 71, the inner diameter of the inner extension section 73, and the outer diameter of the connecting tube of the syringe body 5 are equal. One end of the outer extension section 71 and one end of the inner extension section 73 are connected by the tapered section 72. An opening 9 is formed on the inner wall of the inner extension section 73, and a cover 8 is disposed on the outer side of the inner extension section 73.

[0054] The inner extension 73 has an inner sealing clip with an inner tube 11. The inner cavity of the inner tube 11 has a sealing clip with a blocking block 10. The inner tube 11 has several protruding teeth fixed near the syringe body 5.

[0055] The working process and principle of this embodiment are as follows:

[0056] Before the connecting tube of the syringe body 5 is inserted into the inner extension section 73, the inner tube 11 blocks the opening 9 on the inner extension section 73 to prevent the sterile injection liquid in the casing 8 from flowing out through the opening 9 and the inner cavity of the extension tube 7.

[0057] During the process of inserting the connecting tube of the syringe body 5 into one end of the inner extension section 73, the connecting tube of the syringe body 5 pushes the inner tube 11 to move within the inner extension section 73. After the connecting tube of the syringe body 5 is stuck within the inner extension section 73, the gap between the protruding teeth of the inner tube 11 coincides with the opening 9 on the inner extension section 73, and the inner cavity of the cover 8 communicates with the inner cavity of the inner extension section 73.

[0058] When the medical staff vents the air from the extension tube 7 and the needle 1, they make the cylinder 3 vertical with the needle 1 facing upwards. The medical staff pushes the moving block 2 into the cylindrical slot of the cylinder 3. The moving block 2 squeezes the cover 8, causing the sterile injection fluid in the cover 8 to flow into the extension tube 7. The air pressure in the extension tube 7 increases, and the blocking block 10 sealed in the extension tube 7 disengages from the extension tube 7. The extension tube 7 no longer moves within the inner extension section 73. The sterile injection fluid in the cover 8 fills the inner cavity of the extension tube 7 and the inner cavity of the needle 1, and the sterile injection fluid flows out from the tip of the needle 1.

[0059] If the device is accidentally bumped during placement or transfer, the blocking block 10 inside the internal tube 11 increases the thrust required for the push rod to move into the syringe, preventing the radioactive drug in the syringe body 5 from flowing into the extension tube 7, reducing the risk of radioactive drug leakage from the syringe body 5, and improving the safety of the device.

[0060] Furthermore, the friction force of the blockage block 10 when it moves within the inner extension 73 can be adjusted by adjusting the size of the blockage block 10, the smoothness of the surface of the blockage block 10, or the smoothness of the inner wall of the inner extension 73.

[0061] Example 3:

[0062] like Figure 6 and Figure 7As shown, this embodiment discloses a protective injection device for radioactive drugs. Its structure is roughly the same as that of Embodiment 1 or Embodiment 2. The difference is that this embodiment also includes a rotating rod 17. Two rotating semi-circular cover plates 15 of radiation shielding material are installed on the outer side of the cylinder 3 near the cylindrical slot via hinges, hinge seats or damping shafts. The middle part of the rotating rod 17 and the outer side of one of the semi-circular cover plates 15 are connected by a hinge, rotating pin or bearing. The rotating rod 17 can rotate on the semi-circular cover plate 15. One end of the rotating rod 17 is fixed with an elastic block 16 of rubber or silicone material. An elastic element 18 that pushes the rotating rod 17 to rotate is fixed on the outer side of the semi-circular cover plate 15.

[0063] The working process and principle of this embodiment are as follows:

[0064] like Figure 7 As shown, the two semi-circular cover plates 15 rotate and open, and the elastic element 18 makes the rotating rod 17 perpendicular to the straight edge of the semi-circular cover plate 15. The syringe body 5 drives the extension tube 7 to be inserted into the cylindrical slot of the barrel 3, and the flange of the syringe body 5 abuts against the barrel 3.

[0065] like Figure 6 As shown, the two semi-circular cover plates 15 are rotated to close, the straight edges of the two semi-circular cover plates 15 are in contact, the push rod of the syringe body 5 is located between the two semi-circular cover plates 15, and each of the two semi-circular cover plates 15 is provided with a slot that matches the push rod of the syringe body 5. The elastic block 16 bends and abuts against the push rod of the syringe body 5.

[0066] The two semi-circular covers 15 enhance the radiation shielding effect of the device. If the device is accidentally bumped during placement or transfer, and the plunger of the syringe body 5 is impacted towards the syringe barrel, the plunger moves into the syringe barrel. The plunger causes the elastic block 16 to bend and deform more, generating a greater elastic reaction force. This increases the friction between the plunger of the syringe body 5 and the elastic block 16, preventing the plunger from moving into the syringe barrel, reducing the risk of radioactive drug leakage from the syringe body 5, and improving the safety of the device.

[0067] Before injecting radioactive drugs, medical staff push the rotating rod 17 to rotate the elastic block 16, causing the elastic block 16 and the push rod of the syringe body 5 to disengage from the bent contact state. The elastic block 16 and the push rod of the syringe body 5 are no longer in contact, and the elastic potential energy of the elastic element 18 increases. When the medical staff release the rotating rod 17, the elastic element 18 pushes the rotating rod 17 to rotate, causing the elastic block 16 on the rotating rod 17 to contact the edge of the push rod of the syringe body 5.

[0068] Preferably, the elastic element 18 is an elastic rubber rod or a spring, and the cylinder 3 is provided with a receiving groove that matches the flange of the syringe body 5.

[0069] Furthermore, in this embodiment, the inner side of the semicircular cover plate 15 is the position of the cylindrical slot on the outer side of the semicircular cover plate 15 when the semicircular cover plate 15 is closed, and the semicircular cover plate 15 has a straight edge and a semicircular edge.

[0070] Example 4:

[0071] like Figure 7 As shown, this embodiment discloses a protective injection device for radioactive drugs. Its structure is roughly the same as that of Embodiment 3. The difference is that the elastic element 18 in this embodiment is an elastic metal sheet. One end of the elastic metal sheet is fixed to the outside of the semi-circular cover plate 15, and the other end of the elastic metal sheet abuts against the rotating rod 17. The elastic metal sheet makes it easy to reset the rotating rod 17.

[0072] Example 5:

[0073] like Figure 5 As shown, this embodiment discloses a protective injection device for radiopharmaceuticals. Its structure is roughly the same as that of Embodiment 2. The difference is that the inner diameter of the through hole on the cylinder 3 in this embodiment is larger than the outer diameter of the extension section 71, so as to avoid the extension section 71 contacting the inner wall of the cylinder 3 when it passes through the through hole, thereby avoiding contamination of the inner wall of the needle 1.

[0074] The blocking block 10 is made of radiation shielding material to reduce the radiation intensity at the needle tip 1.

[0075] Furthermore, the outer side of the cover 8 is cylindrical.

[0076] Example 6:

[0077] like Figure 4 As shown, this embodiment discloses a protective injection device for radioactive drugs. Its structure is roughly the same as that of Embodiment 5. The difference is that the blocking block 10 in this embodiment is a sphere, and the inner wall of the conical section 72 is provided with several grooves to ensure that the radioactive drugs in the inner extension section 73 can flow into the needle 1.

[0078] Example 7:

[0079] like Figure 5 As shown, this embodiment discloses a protective injection device for radiopharmaceuticals. Its structure is roughly the same as that of Embodiment 1. The difference is that in this embodiment, an elastic limiting block 14 is fixed on the outer side of the cylinder 3 near the moving block 2. The elastic limiting block 14 abuts against the outer side of the moving block 2. The friction between the elastic limiting block 14 and the moving block 2 makes it convenient for the moving block 2 to move and be positioned on the sliding hole 12.

[0080] Furthermore, this embodiment also includes a connecting rope 13, the two ends of which are fixedly connected to the elastic limiting block 14 and the moving block 2, respectively, and the connecting rope 13 prevents the moving block 2 from detaching from the sliding hole 12.

[0081] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention.

Claims

1. A protective injection device for radioactive drugs, characterized in that: The tube includes an extension tube (7) and a cylindrical body (3) made of radiation shielding material. One end of the cylindrical body (3) has a cylindrical slot. A through hole is provided at the middle position of the bottom of the cylindrical slot. An annular cover (8) is fitted on the middle part of the outer side of the extension tube (7). The two sides of the cover (8) are fixedly connected to the outer side of the extension tube (7). An opening (9) is provided on the inner wall of the extension tube (7) to communicate with the inner cavity of the cover (8). A sliding hole (12) is provided on the outer side of the cylindrical body (3) near the bottom of the cylindrical slot. A sliding block (2) with sealing is installed on the sliding hole (12). Wherein, the outer diameter of the cover (8) and the inner diameter of the cylindrical slot are the same; The inner cavity of the cover (8) is filled with sterile injection liquid. One end of the extension tube (7) is connected to the connecting tube of the syringe body (5). The syringe body (5) drives the extension tube (7) to be inserted into the cylindrical slot of the barrel (3). The end of the extension tube (7) away from the syringe body (5) passes through the through hole and is connected to the needle (1). The flange of the syringe body (5) abuts against the barrel (3). When the radioactive drug is injected, the moving block (2) is pushed into the cylindrical slot of the cylinder (3). The moving block (2) squeezes the cover (8), so that the sterile injection liquid in the cover (8) flows into the extension tube (7) and the needle (1) through the opening (9).

2. The protective injection device for radioactive pharmaceuticals according to claim 1, characterized in that: The extension tube (7) includes an outer extension section (71), a tapered section (72), and an inner extension section (73). The outer diameter of the outer extension section (71), the inner diameter of the inner extension section (73), and the outer diameter of the connecting tube of the syringe body (5) are equal. One end of the outer extension section (71) and one end of the inner extension section (73) are connected by the tapered section (72). The opening (9) is formed on the inner wall of the inner extension section (73). The inner extension section (73) is sealed with an inner tube (11), and the inner cavity of the inner tube (11) is sealed with a blocking block (10). The inner tube (11) is fixed with several protruding teeth near the syringe body (5). Before the connecting tube of the syringe body (5) is inserted into the inner extension section (73), the inner tube (11) blocks the opening (9) on the inner extension section (73). Wherein, after the connecting tube of the syringe body (5) is inserted into the inner extension section (73), the gap of the protruding teeth of the inner tube (11) coincides with the opening (9) on the inner extension section (73), and the inner cavity of the cover (8) and the inner cavity of the inner extension section (73) are connected.

3. The protective injection device for radioactive pharmaceuticals according to claim 2, characterized in that: It also includes a rotating rod (17), and two rotating semi-circular cover plates (15) of radiation shielding material are rotatably installed on the outer side of the cylinder (3) near the cylindrical slot. The middle part of the rotating rod (17) is rotatably connected to the outer side of one of the semi-circular cover plates (15). An elastic block (16) is fixed at one end of the rotating rod (17), and an elastic element (18) that pushes the rotating rod (17) to rotate is fixed on the outer side of the semi-circular cover plate (15). Among them, the two semi-circular cover plates (15) are rotated open, and the syringe body (5) is inserted into the cylindrical slot of the barrel (3); Among them, the two semi-circular cover plates (15) are rotated to close, the push rod of the syringe body (5) is located between the two semi-circular cover plates (15), and the two semi-circular cover plates (15) are provided with slots that are compatible with the push rod of the syringe body (5), and the elastic block (16) bends and abuts against the push rod of the syringe body (5). In this process, by pushing the rotating rod (17) to drive the elastic block (16) to rotate, the elastic block (16) and the push rod of the syringe body (5) are separated from the bent contact state, and the elastic potential energy of the elastic element (18) increases.

4. The protective injection device for radiopharmaceuticals according to claim 3, characterized in that: The elastic element (18) is an elastic metal sheet. One end of the elastic metal sheet is fixed to the outside of the semi-circular cover plate (15), and the other end of the elastic metal sheet abuts against the rotating rod (17).

5. The protective injection device for radioactive pharmaceuticals according to claim 2, characterized in that: The inner diameter of the through hole on the cylinder (3) is larger than the outer diameter of the extension section (71), and the blocking block (10) is made of radiation shielding material.

6. The protective injection device for radioactive pharmaceuticals according to claim 5, characterized in that: The blocking block (10) is a sphere, and the inner wall of the conical segment (72) has several grooves.

7. The protective injection device for radioactive pharmaceuticals according to claim 1, characterized in that: An elastic limiting block (14) is fixed on the outer side of the cylinder (3) near the moving block (2), and the elastic limiting block (14) abuts against the outer side of the moving block (2).

8. The protective injection device for radioactive pharmaceuticals according to claim 7, characterized in that: It also includes a connecting rope (13), the two ends of which are fixedly connected to the elastic limiting block (14) and the moving block (2), respectively.

9. The protective injection device for radioactive pharmaceuticals according to claim 1, characterized in that: The outer side of the cylinder (3) is provided with an elongated hole (6) along its length direction, and a radiation-proof lead glass (4) is fixedly installed in the elongated hole (6).

10. The protective injection device for radiopharmaceuticals according to claim 1, characterized in that: The cylinder (3) is made of tungsten alloy or lead.

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