Protective injection device for radiopharmaceuticals

Abstract

The invention relates to the technical field of medicine injection, and particularly discloses a radiopharmaceutical protection type injection device which comprises an extension tube and a barrel made of radiation shielding materials, a cylindrical groove is formed in one end of the barrel, and a via hole is formed in the middle of the bottom of the cylindrical groove. The middle of the outer side of the extension pipe is sleeved with an annular cover shell, the two edges of the cover shell are fixedly connected with the outer side of the extension pipe respectively, an opening communicated with an inner cavity of the cover shell is formed in the inner wall of the extension pipe, a sliding hole is formed in the position, close to the bottom of the cylindrical open groove, of the outer side of the barrel, and a movable block sliding in a sealed mode is installed on the sliding hole. According to the technical scheme, the injection amount of radiopharmaceuticals is accurately controlled, waste of the radiopharmaceuticals is reduced, when the hands of medical staff approach the needle head, no radiopharmaceuticals exist in the needle head, and the radiation dose borne by the hands of the medical staff is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of drug injection, in particular to a protective injection device for radioactive drugs. Background Art

[0002] Radioactive drugs are widely used in diagnosis and treatment in the medical field. The injection dose of radioactive drugs is precisely calculated to ensure that the benefits far outweigh the risks. During diagnosis, radioactive drugs non-invasively reveal the physiological, biochemical functions and disease status inside the body, providing crucial early diagnosis and accurate staging information. During treatment, radioactive drugs deliver high-energy radiation to diseased tissues (such as tumors and abnormal glands), destroying diseased cells from the inside, achieving efficient and relatively low-toxic treatment effects.

[0003] When injecting existing radioactive drugs, a radioactive shielding tube is often placed on the syringe to shield the radioactive radiation of the syringe. However, the radioactive radiation shielding is difficult to cover the syringe needle. Medical staff's hands need to be close to the syringe needle during the injection process, such as removing the needle, replacing the needle, and discarding the needle. A certain dose of radioactive drugs is likely to remain in the needle, which becomes the main source of risk of occupational radiation exposure for medical staff. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the existing defects and provide a protective injection device for radioactive drugs, which can accurately control the injection amount of radioactive drugs and reduce the waste of radioactive drugs. When the medical staff's hand approaches the needle, there is no radioactive drug in the needle, thereby reducing the radiation dose received by the medical staff's hands.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a protective injection device for radioactive drugs, comprising an extension tube and a barrel made of radiation shielding material, a cylindrical groove being provided at one end of the barrel, a through hole being provided at the middle position of the bottom of the cylindrical groove, an annular cover being provided on the middle part of the outer side of the extension tube, two edges of the cover being fixedly connected to the outer side of the extension tube respectively, an opening being provided on the inner wall of the extension tube to connect to the inner cavity of the cover, a sliding hole being provided on the outer side of the barrel near the bottom of the cylindrical groove, and a sealing sliding moving block being installed on the sliding hole.

[0006] Wherein, the outer diameter of the housing is the same as the inner diameter of the cylindrical slot.

[0007] The inner cavity of the cover is filled with sterile injection liquid, one end of the extension tube is connected to the connecting tube of the syringe body, the syringe body drives the extension tube to be inserted into the cylindrical groove of the barrel, the end of the extension tube away from the syringe body passes through the through hole and is connected to the needle, and the flange of the syringe body rests on the barrel.

[0008] As a preferred technical solution of the present invention, the extension tube includes 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 syringe body connecting tube are equal, one end of the outer extension section and one end of the inner extension section are connected through a tapered section, and the opening is opened on the inner wall of the inner extension section.

[0009] The sealing card in the inner extension section is provided with an inner tube, the sealing card in the inner cavity of the inner tube is provided with a blocking block, and a plurality of convex teeth are fixed on the position of the inner tube close to the syringe body.

[0010] Wherein, before the connecting tube of the syringe body is stuck in the inner extension section, the inner tube blocks the opening on the inner extension section.

[0011] Among them, after the connecting tube of the syringe body is stuck in the inner extension section, the convex tooth gap of the inner tube and the opening on the inner extension section coincide with each other, and the inner cavity of the cover shell is connected with the inner cavity of the inner extension section.

[0012] As a preferred technical solution of the present invention, it also includes a rotating rod, and two rotating semicircular cover plates made of radiation shielding material are rotatably installed on the outside of the cylinder near the cylindrical slot. The middle part of the rotating rod is rotatably connected to the outside of one of the semicircular cover plates, an elastic block is fixed at one end of the rotating rod, and an elastic part that drives the rotating rod to rotate is fixed on the outside of the semicircular cover plate.

[0013] The two semicircular cover plates are rotated open, and the syringe body is inserted into the cylindrical groove of the barrel.

[0014] Among them, the two semicircular cover plates are rotated to close, and the push rod of the syringe body is located between the two semicircular cover plates. Both semicircular cover plates are provided with a slot adapted to 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 pushed to rotate by pushing the rotating rod, so that the elastic block and the push rod of the syringe body are released from the bent abutment state, and the elastic potential energy of the elastic member is increased.

[0016] As a preferred technical solution of the present invention, the elastic member is an elastic metal sheet, one end of the elastic metal sheet is fixed to the outer side of the semicircular cover plate, and the other end of the elastic metal sheet is against the rotating rod.

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

[0018] As a preferred technical solution of the present invention, the blocking block is a sphere, and the inner wall of the conical section is provided with a plurality of grooves.

[0019] As a preferred technical solution of the present invention, an elastic limiting block is fixed on the outer side of the cylinder near the moving block, and the elastic limiting block abuts against the outer side of the moving block.

[0020] As a preferred technical solution of the present invention, it also includes a connecting rope, and both ends of the connecting rope are fixedly connected to the elastic limiting block and the moving block respectively.

[0021] As a preferred technical solution of the present invention, a long hole is opened on the outer side of the cylinder along its length direction, and radiation-proof lead glass is fixedly installed in the long hole.

[0022] As a preferred technical solution of the present invention, the cylinder is made of tungsten alloy or lead.

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

[0024] 1. The protective injection device for radioactive drugs in the example of the present invention accurately controls the injection volume of radioactive drugs and reduces the waste of radioactive drugs. When the medical staff's hands need to approach the needle during operation, there is no radioactive drug in the needle, which reduces the radiation dose received by the medical staff's hands.

[0025] 2. In the protective injection device for radioactive drugs exemplified in the present invention, the sterile injection liquid in the inner cavity of the cover is used to vent the needle and empty the radioactive drug in the needle, thereby reducing the risk of radiation exposure for medical staff; on the other hand, if the device is accidentally bumped during placement or transfer, the blocking block in the internal tube increases the thrust required for the push rod to move into the syringe, preventing the radioactive drug in the syringe body from flowing into the extension tube, reducing the risk of leakage of the radioactive drug in the syringe body, and improving the safety of the device; on another hand, the blocking block is made of radiation shielding material, which reduces the radiation intensity at the needle.

[0026] 3. The protective injection device for radioactive drugs in the example of the present invention is subjected to an accidental collision during the placement or transfer process. When the push rod of the syringe body is impacted in the direction of the syringe barrel, the push rod moves into the syringe barrel, and the push rod causes the bending deformation of the elastic block to increase. The elastic block generates a greater elastic reaction force, resulting in an increase in the friction between the push rod of the syringe body and the elastic block, preventing the push rod from moving into the syringe barrel, reducing the risk of leakage of radioactive drugs in the syringe body, and improving the safety of the device.

[0027] 4. In the protective injection device for radioactive drugs of the present invention, the inner diameter of the through hole on the barrel is larger than the outer diameter of the extension section, so as to prevent the extension section from contacting the inner wall of the barrel when passing through the through hole, thereby preventing the inner wall of the needle from being contaminated.

[0028] 5. In the protective injection device for radioactive drugs exemplified in the present invention, radiation-proof lead glass is fixed in the long hole by welding or medical-grade adhesive. Medical staff can observe the volume of radioactive drugs in the syringe, bubble removal and injection progress in real time through the radiation-proof lead glass to ensure the accuracy of drug administration. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic structural diagram of one perspective of the present invention;

[0030] Figure 2 It is a partial cross-sectional structural schematic diagram of the present invention;

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

[0032] Figure 4 It is a partial cross-sectional structural diagram of the extension tube and the cover shell of the present invention;

[0033] Figure 5 It is a structural schematic diagram of another perspective of the present invention;

[0034] Figure 6 This is a structural schematic diagram of the semicircular cover in the closed state of the present invention;

[0035] Figure 7 This is a structural schematic diagram of the semicircular cover of the present invention in an open state.

[0036] In the figure: 1 needle, 2 moving block, 3 cylinder, 4 radiation-proof lead glass, 5 syringe body, 6 long hole, 7 extension tube, 71 extension section, 72 tapered section, 73 inner extension section, 8 cover, 9 opening, 10 blocking block, 11 inner tube, 12 sliding hole, 13 connecting rope, 14 elastic limit block, 15 semicircular cover plate, 16 elastic block, 17 rotating rod, 18 elastic member. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0038] Example 1:

[0039] See also Figure 1-Figure 5This embodiment discloses a protective injection device for radioactive drugs, including an extension tube 7 and a barrel 3 made of radiation shielding material. A cylindrical groove is opened at one end of the barrel 3, and a through hole is opened in the middle of the bottom of the cylindrical groove. An annular cover 8 is sleeved on the middle of the outer side of the extension tube 7. The two edges of the cover 8 are respectively fixedly connected to the outer side of the extension tube 7. An opening 9 is opened on the inner wall of the extension tube 7 to communicate with the inner cavity of the cover 8. A sliding hole 12 is opened on the outer side of the barrel 3 near the bottom of the cylindrical groove, and a sealing sliding moving block 2 is installed on the sliding hole 12.

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

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

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

[0043] The inner cavity of the cover 8 is pre-filled with sterile injection liquid. Medical personnel connect one end of the extension tube 7 to the connecting tube of the syringe body 5 in advance by remote operation through an electric manipulator or by manual operation by medical personnel wearing radiation shielding clothing.

[0044] The medical staff pulls the moving block 2 to move the moving block 2 outward from the barrel 3, and the moving block 2 does not separate from the sliding hole 12 on the barrel 3. The medical staff drives the syringe body 5 to drive the extension tube 7 to be inserted into the cylindrical groove 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, and the flange of the syringe body 5 rests on the barrel 3.

[0045] The medical staff makes the barrel 3 vertical and the needle 1 face upward, and pushes the movable block 2 to move into the cylindrical groove of the barrel 3. The movable 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 movable block 2, and the air in the extension tube 7 and the needle 1 is completely discharged.

[0046] The medical staff inserts the needle 1 into the patient's vein, and pushes the push rod of the syringe body 5 to inject the radioactive drug into the patient's vein. After the injection of the radioactive drug is completed, the medical staff pushes the moving block 2 to move into the cylindrical groove of the barrel 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. The radioactive drugs in the extension tube 7 and the needle 1 are all brought into the patient's vein by the sterile injection liquid, and the injection amount of the radioactive drug is accurately controlled to reduce the waste of radioactive drugs. When the medical staff's hand needs to approach the needle 1 during the operation, there is no radioactive drug in the needle 1, thereby reducing the radiation dose received by the medical staff's hands.

[0047] Preferably, a long hole 6 is opened on the outside of the barrel 3 along its length direction, and a radiation-proof lead glass 4 is fixed in the long hole 6 by welding or medical-grade adhesive. Medical staff can observe the volume of radioactive drugs in the syringe, bubble removal and injection progress in real time through the radiation-proof lead glass 4 to ensure the accuracy of drug administration.

[0048] Preferably, the sterile injection liquid is Ringer's solution, normal 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 a paint layer or a rubber layer is fixed on the outside of the cylinder 3.

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

[0051] Furthermore, if there are a small amount of bubbles in the inner cavity of the cover 8, since the injection operation is mostly horizontal or inclined, the bubbles are located at the highest point of the inner cavity of the cover 8, and the moving block 2 squeezes the cover 8, and the 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 radioactive drugs, and its structure is roughly the same as that of the first embodiment, except that the extension tube 7 of 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, the opening 9 is opened on the inner wall of the inner extension section 73, and the cover shell 8 is arranged on the outside of the inner extension section 73.

[0054] 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 a plurality of protruding teeth near the syringe body 5 .

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

[0056] Before the connecting tube of the syringe body 5 is stuck in 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 cover 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 main body 5 into one end of the inner extension section 73, the connecting tube of the syringe main body 5 pushes the inner tube 11 to move in the inner extension section 73. After the connecting tube of the syringe main body 5 is stuck in the inner extension section 73, the convex tooth gap of the inner tube 11 coincides with the opening 9 on the inner extension section 73, and the inner cavity of the cover shell 8 and the inner cavity of the inner extension section 73 are connected.

[0058] When the medical staff is venting the extension tube 7 and the needle 1, the medical staff makes the cylinder 3 vertical and the needle 1 face upward, and pushes the movable block 2 to move into the cylindrical groove of the cylinder 3. The movable block 2 squeezes the cover 8, so that the sterile injection liquid in the cover 8 flows 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 is separated from the extension tube 7, and the extension tube 7 does not move in the inner extension section 73. The sterile injection liquid 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 liquid flows out of the tip of the needle 1.

[0059] If the device is accidentally bumped during placement or transfer, the blocking block 10 in 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 leakage of the radioactive drug in the syringe body 5, and improving the safety of the device.

[0060] Furthermore, the friction force of the blocking block 10 when moving in the inner extension section 73 can be adjusted by adjusting the size of the blocking block 10 , the smoothness of the surface of the blocking block 10 , or the smoothness of the inner wall of the inner extension section 73 .

[0061] Example 3:

[0062] like Figure 6 and Figure 7As shown, this embodiment discloses a protective injection device for radioactive drugs, and its structure is roughly the same as that of embodiment one or embodiment two, except that this embodiment further includes a rotating rod 17, and two rotating semicircular cover plates 15 made of radiation shielding material are installed on the outside of the cylinder 3 near the cylindrical slot through hinges, hinged seats or damping shafts. The middle part of the rotating rod 17 and the outside of one of the semicircular cover plates 15 are connected through hinges, rotating pins or bearings. The rotating rod 17 can rotate on the semicircular cover plate 15, and an elastic block 16 made of rubber or silicone material is fixed to one end of the rotating rod 17, and an elastic member 18 for pushing the rotating rod 17 to rotate is fixed to the outside of the semicircular cover plate 15.

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

[0064] like Figure 7 As shown, the two semicircular cover plates 15 are rotated open, and the elastic member 18 makes the rotating rod 17 and the straight edges of the semicircular cover plates 15 perpendicular. The syringe body 5 drives the extension tube 7 to be inserted into the cylindrical groove of the barrel 3, and the flange of the syringe body 5 rests on the barrel 3.

[0065] like Figure 6 As shown, the two semicircular cover plates 15 are rotated to close, the straight edges of the two semicircular cover plates 15 are fitted together, the push rod of the syringe body 5 is located between the two semicircular cover plates 15, and both semicircular cover plates 15 are provided with a slot adapted to the push rod of the syringe body 5, and the elastic block 16 is bent to abut against the push rod of the syringe body 5.

[0066] The two semicircular covers 15 improve the radiation shielding effect of the device. When the device is accidentally bumped during placement or transfer, the push rod of the syringe body 5 is impacted in the direction of the syringe barrel, and the push rod moves into the syringe barrel. The push rod increases the bending deformation of the elastic block 16, and the elastic block 16 generates a greater elastic reaction force, resulting in an increase in the friction between the push rod of the syringe body 5 and the elastic block 16, preventing the push rod from moving into the syringe barrel, reducing the risk of leakage of radioactive drugs in the syringe body 5, and improving the safety of the device.

[0067] Before injecting radioactive drugs, the medical staff pushes the rotating rod 17 to rotate the elastic block 16, so that the elastic block 16 and the push rod of the syringe body 5 are out of the bent abutment state. The elastic block 16 and the push rod of the syringe body 5 are not in contact, and the elastic potential energy of the elastic member 18 increases. The medical staff releases the rotating rod 17, and the elastic member 18 pushes the rotating rod 17 to rotate, so that the elastic block 16 on the rotating rod 17 contacts the edge of the push rod of the syringe body 5.

[0068] Preferably, the elastic member 18 is an elastic rubber rod or a spring, and the barrel 3 is provided with a receiving groove adapted to 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 outer side of the semicircular cover plate 15 corresponding to the cylindrical groove 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, and its structure is roughly the same as that of the third embodiment. The difference is that the elastic member 18 of this embodiment is an elastic metal sheet, one end of the elastic metal sheet is fixed to the outer side of the semicircular cover 15, and the other end of the elastic metal sheet is against the rotating rod 17. The elastic metal sheet facilitates the resetting of the rotating rod 17.

[0072] Embodiment 5:

[0073] like Figure 5 As shown, this embodiment discloses a protective injection device for radioactive drugs, and its structure is roughly the same as that of the second embodiment. The difference is that the inner diameter of the through hole on the cylinder 3 of this embodiment is larger than the outer diameter of the extension section 71, so as to prevent the extension section 71 from contacting the inner wall of the cylinder 3 when passing through the through hole, thereby preventing the inner wall of the needle 1 from being contaminated.

[0074] The blocking block 10 is made of radiation shielding material to reduce the radiation intensity at the needle 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, and its structure is roughly the same as that of the fifth embodiment. The difference is that the blocking block 10 of this embodiment is a sphere, and the inner wall of the conical section 72 is provided with a plurality of grooves to ensure that the radioactive drugs in the inner extension section 73 can flow into the needle 1.

[0078] Embodiment seven:

[0079] like Figure 5 As shown, this embodiment discloses a protective injection device for radioactive drugs, and its structure is roughly the same as that of the first embodiment. The difference is that an elastic limit block 14 is fixed to the outer side of the cylinder 3 of this embodiment near the moving block 2. The elastic limit block 14 is against the outer side of the moving block 2. The friction between the elastic limit block 14 and the moving block 2 makes it easy for the moving block 2 to move and position on the sliding hole 12.

[0080] Furthermore, this embodiment further 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. The connecting rope 13 prevents the moving block 2 from detaching from the sliding hole 12 .

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

Claims

1. A protective injection device for radiopharmaceuticals, characterized by: It comprises an extension tube (7) and a barrel (3) made of radiation shielding material, wherein one end of the barrel (3) is provided with a cylindrical slot, a through hole is provided at the middle position of the bottom of the cylindrical slot, an annular cover (8) is sleeved on the middle part of the outer side of the extension tube (7), two edges of the cover (8) are respectively fixedly connected to the outer side of the extension tube (7), an opening (9) communicating with the inner cavity of the cover (8) is provided on the inner wall of the extension tube (7), a sliding hole (12) is provided on the outer side of the barrel (3) near the bottom of the cylindrical slot, and a sealing sliding moving block (2) is installed on the sliding hole (12); Wherein, the outer diameter of the housing (8) is the same as the inner diameter of the cylindrical slot; The inner cavity of the housing (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 groove 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), and the flange of the syringe body (5) is against the barrel (3).

2. The radiopharmaceutical protective injection device according to claim 1, characterized in that: The extension tube (7) comprises 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 via the tapered section (72); and the opening (9) is formed on the inner wall of the inner extension section (73); The sealing card inside the inner extension section (73) is provided with an inner tube (11), the sealing card in the inner cavity of the inner tube (11) is provided with a blocking block (10), and a plurality of protruding teeth are fixed at a position of the inner tube (11) close to the syringe body (5); Wherein, before the connecting tube of the syringe body (5) is stuck in the inner extension section (73), the inner tube (11) blocks the opening (9) on the inner extension section (73); After the connecting tube of the syringe body (5) is clamped in the inner extension section (73), the convex tooth gap of the inner tube (11) and the opening (9) on the inner extension section (73) coincide with each other, and the inner cavity of the cover shell (8) and the inner cavity of the inner extension section (73) are connected.

3. The radiopharmaceutical protective injection device according to claim 2, characterized in that: It also includes a rotating rod (17), two rotating semicircular cover plates (15) made 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 semicircular cover plates (15), one end of the rotating rod (17) is fixed with an elastic block (16), and the outer side of the semicircular cover plate (15) is fixed with an elastic member (18) for driving the rotating rod (17) to rotate; The two semicircular cover plates (15) are rotated open, and the syringe body (5) is inserted into the cylindrical slot of the barrel (3); The two semicircular cover plates (15) are rotated to close, and the push rod of the syringe body (5) is located between the two semicircular cover plates (15). The two semicircular cover plates (15) are each provided with a slot adapted to the push rod of the syringe body (5), and the elastic block (16) is bent to abut against the push rod of the syringe body (5); The elastic block (16) is rotated by pushing the rotating rod (17), so that the elastic block (16) and the push rod of the syringe body (5) are released from the bent abutment state, and the elastic potential energy of the elastic member (18) is increased.

4. The protective injection device for radiopharmaceuticals according to claim 3, characterized in that: The elastic member (18) is an elastic metal sheet, one end of which is fixed to the outside of the semicircular cover plate (15), and the other end of which is against the rotating rod (17).

5. The radiopharmaceutical protective injection device 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 drugs according to claim 5, characterized in that: The blocking block (10) is a sphere, and the inner wall of the conical section (72) is provided with a plurality of grooves.

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

9. The radiopharmaceutical protective injection device according to claim 1, characterized in that: A long hole (6) is provided on the outer side of the cylinder (3) along its length direction, and radiation-proof lead glass (4) is fixedly installed in the long hole (6).

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

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