A radiopharmaceutical injection device

Abstract

The present application relates to the technical field of medical injection devices, and particularly relates to a radioactive drug injection device. The technical scheme comprises a storage assembly, an injection assembly, an exhaust assembly and a sterile plug three-way valve; the storage assembly is composed of an inner cylinder and an outer cylinder coaxially sleeved, a liquid chamber is formed in the inner cylinder, an annular liquid storage groove is formed in the inner wall of the outer cylinder, radioactive liquid and physiological saline are respectively stored in the liquid storage groove, two inlet ports of the sterile plug three-way valve are respectively connected to the bottom of the double cavities, and the outlet port of the three-way valve is connected to an external indwelling needle. The radioactive liquid injection and the physiological saline pipeline flushing can be sequentially completed by single-step pressing, the flow path is switched by the sterile plug three-way valve, the overall structure is compact and easy to operate, the risk of radiation exposure of medical staff can be effectively reduced, the device has the characteristics of leakage prevention, pollution prevention and exhaust safety, and is suitable for the scene of nuclear medicine radioactive drug injection.

Description

Technical Field

[0001] This invention relates to the field of medical injection device technology, and more particularly to a radiopharmaceutical injection device. Background Technology

[0002] In nuclear medicine diagnosis and treatment, radiopharmaceuticals need to be administered intravenously to patients. To ensure accurate dosage and avoid local radiation and environmental pollution caused by residual radiopharmaceuticals in the tubing, the routine clinical procedure is divided into two steps: first, the radiopharmaceutical solution is pushed to complete the administration, and then normal saline is pushed to flush the injection tubing.

[0003] Currently, existing injection devices of this type mainly fall into two categories: one type uses two independent syringes with a three-way valve, one containing radioactive drug solution and the other containing physiological saline. Medical staff need to operate the two syringes sequentially to complete the injection and flushing, which is cumbersome and significantly increases the time medical staff are exposed to radioactive materials, resulting in a high risk of radiation exposure. The other type is an integrated dual-chamber injection structure, but existing dual-chamber injection devices mostly use a synchronous dispensing structure, which easily causes the radioactive drug solution to be diluted by physiological saline, affecting the diagnostic and treatment effects. At the same time, the venting structure of traditional injection devices is simple, and radioactive drug solution leakage is very likely to occur during the venting process, which not only wastes the drug but also causes radioactive contamination. Some devices lack an independent sealing structure, and media cross-flow and external bacterial invasion can easily occur inside the cavity, and the sterility performance cannot meet the requirements for the use of radiopharmaceuticals. Therefore, this application proposes a radiopharmaceutical injection device. Summary of the Invention

[0004] The purpose of this invention is to address the problems in the prior art, such as cumbersome operation, high risk of radiation exposure, easy dilution of the drug solution, easy leakage of the drug during venting, and poor sealing performance, and to propose a radiopharmaceutical injection device.

[0005] The technical solution of the present invention: A radiopharmaceutical injection device, comprising a storage component, an injection component, an exhaust component, and a sterile stopcock three-way valve. The storage component comprises an inner cylinder and an outer cylinder coaxially sleeved together. A drug solution chamber is formed inside the inner cylinder, and an annular storage tank is formed on the inner wall of the outer cylinder. The drug solution chamber and the annular storage tank are used to store radiopharmaceutical solution and physiological saline, respectively. The bottoms of the inner cylinder and the outer cylinder are independently connected to two inlets of the sterile stopcock three-way valve, and the outlet of the sterile stopcock three-way valve is used to connect to an external indwelling needle. The injection assembly is slidably assembled on the top of the inner cylinder and the outer cylinder. The injection assembly includes an inner and outer piston structure that elastically slides together, corresponding to the sealed drug chamber and the annular reservoir respectively. The effective axial stroke of the inner piston is greater than that of the outer piston. The injection assembly can achieve independent elastic sliding to form a fixed pushing sequence. The exhaust assembly includes independent exhaust channels and a resettable sealing structure respectively corresponding to the drug liquid chamber and the annular liquid storage tank, which are used for independent exhaust of the two chambers and can be sealed tightly. The injection assembly is configured with a single-step press-and-push structure. It first injects the radioactive drug solution, and then automatically pushes physiological saline solution after the drug solution is pushed, thereby achieving automatic flushing of the external injection tubing.

[0006] Optionally, the outer cylinder is fixedly fitted at the middle position of the outer side of the inner cylinder, and the upper end of the outer cylinder extends beyond the upper end of the inner cylinder. The top of the outer cylinder and the top of the inner cylinder are respectively provided with independent outer cylinder sealing caps and inner cylinder sealing caps to achieve independent sealing of the dual cavities of the medicine chamber and the annular storage tank.

[0007] Optionally, a connecting block is provided at the top of the injection assembly, a main push sleeve is fixed at the bottom center of the connecting block, and multiple auxiliary push rods are fixed at the bottom edge of the connecting block. The bottom ends of the multiple auxiliary push rods are jointly fixedly connected to an annular sealing piston. A cross-shaped slide rod is slidably nested inside the main push sleeve, and a sealing piston is fixedly connected at the bottom end of the cross-shaped slide rod. The sealing piston is slidably sealed inside the inner cylinder, and the annular sealing piston is slidably sealed inside the outer cylinder.

[0008] Optionally, the top of the cross-shaped slide bar is elastically connected to the top of the main push sleeve via a spring, so that the sealing piston has an elastic buffer stroke during the advancement process, which can realize the advance sliding of the press, and after sliding into place, it advances synchronously with the injection assembly as a whole, forming a stable drug-before-water sequential motion relationship.

[0009] Optionally, the exhaust assembly includes an exhaust channel two located at the center and an exhaust channel one located inside each auxiliary push rod. The exhaust channel two connects to the medicine chamber of the inner cylinder, and the exhaust channel one connects to the annular liquid storage tank of the outer cylinder, thereby realizing independent exhaust operations for the medicine chamber and the saline chamber.

[0010] Optionally, a sealing plug is installed at the bottom of the second exhaust channel and a sealing plug is installed at the bottom of the first exhaust channel. After the sealing plug is reset, it can automatically seal the corresponding exhaust channel, ensuring that the two chambers are completely sealed and there is no media leakage during the injection process. The top of the sealing plugs one and two are respectively fixed with connecting rod one and connecting rod two extending to the outside of the structure. The outer diameter of the connecting rod is smaller than the inner diameter of the corresponding exhaust channel.

[0011] Optionally, the inner cylinder is provided with a discharge pipe at the bottom and the outer cylinder is provided with a discharge pipe at the bottom. The discharge pipe and the discharge pipe are independently inserted into and sealed to the two inlets of the sterile stopcock three-way valve, so as to realize the independent convergence of the drug solution and physiological saline and the unidirectional output to the indwelling needle.

[0012] Optionally, both the outer cylinder sealing cap and the inner cylinder sealing cap adopt a threaded sealing installation structure, and are respectively provided with sliding through holes for matching auxiliary push rod and main push sleeve, so as to ensure the smooth sliding of the push rod and continuously maintain the sterile sealing performance of the cavity.

[0013] Compared with the prior art, this application includes at least one of the following beneficial technical effects: 1. This invention employs an inner and outer piston with differentiated strokes and an elastic connection structure. Relying on the mechanical structure to limit the movement sequence, a single press can push the radioactive drug solution first and then the physiological saline solution. With the help of a sterile stopcock three-way valve to switch the flow path, the media in the two chambers will not mix in advance, completely solving the problem of drug solution dilution in traditional dual-chamber devices and ensuring the therapeutic effect of radiopharmaceuticals.

[0014] 2. This invention integrates dual liquid storage chambers with push and vent structures, eliminating the need to switch between multiple syringes and tubing. Medical personnel only need to use a three-way valve to easily switch the flow path, and injection and tubing flushing can be completed with a single press, significantly shortening operation time, effectively reducing the time of contact with radioactive materials, and improving operational safety.

[0015] 3. This invention features two independent exhaust channels and a resettable sealing plug. The drug chamber and the saline chamber are vented separately. The exhaust channels utilize the gap between the rod and the channel to allow gas to escape. After the sealing plug is reset, it can completely seal the channel, preventing leakage of radioactive drug during the exhaust process. At the same time, the independent threaded sealing cap achieves sterile sealing of the double chamber, effectively blocking the intrusion of external impurities and bacteria, and also preventing media cross-flow.

[0016] 4. In this invention, the inner cylinder discharge pipe and the outer cylinder discharge pipe are independently connected to a sterile stopcock three-way valve, and the two media are output separately under control. Physiological saline can thoroughly flush the entire injection line, completely remove the residual radioactive drug solution on the inner wall of the line, and avoid local radiation and environmental pollution caused by residual drugs. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a cross-sectional view of the overall structure of the present invention; Figure 3 This is a three-dimensional sectional view of the inner cylinder of the present invention. Figure 4 This is a three-dimensional structural cross-sectional view of the outer cylinder of the present invention; Figure 5 This is a three-dimensional cross-sectional view of the injection component of the present invention. Figure 6 For the present invention Figure 4 Enlarged view of the structure at point A; Figure 7 For the present invention Figure 5Enlarged view of the structure at point B.

[0018] Reference numerals: 1. Storage assembly; 101. Outer cylinder; 102. Inner cylinder; 103. Sterile stopcock three-way valve; 104. Discharge pipe; 105. Outer cylinder sealing cap; 106. Inner cylinder sealing cap; 2. Injection assembly; 201. Main push sleeve; 202. Auxiliary push rod; 203. Connecting block; 204. Spring; 205. Sealing piston; 206. Annular sealing piston; 207. Cross-shaped slide bar; 3. Exhaust assembly; 301. Connecting rod one; 302. Sealing plug one; 303. Connecting rod two; 304. Sealing plug two; 305. Exhaust channel one; 306. Exhaust channel two. Detailed Implementation

[0019] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0020] like Figure 1 , Figure 2 , Figure 3 , Figure 4As shown, the radiopharmaceutical injection device proposed in this invention is assembled from four core components: a storage component 1, an injection component 2, an exhaust component 3, and a sterile stopcock three-way valve 103. The storage component 1 mainly consists of an inner cylinder 102, an outer cylinder 101, an outer cylinder sealing cap 105, an inner cylinder sealing cap 106, an exhaust pipe 104, and an inner cylinder bottom discharge pipe. The outer cylinder 101 is fixedly fitted onto the middle of the outer side of the inner cylinder 102, and the two are arranged coaxially. The upper end of the outer cylinder 101 extends upward and beyond the upper end of the inner cylinder 102, forming a staggered structure. The inner cylinder 102 is hollow, forming a sealed drug solution chamber for quantitatively storing the radiopharmaceutical solution to be injected. An annular storage tank is formed on the inner wall of the outer cylinder 101. The annular storage tank and the outer wall of the inner cylinder 102 form an independent cavity specifically for storing physiological saline for pipeline flushing. The drug solution chamber and the annular storage tank are isolated from each other and have no medium communication channels. The inner cylinder 102 has an inner cylinder sealing cap 106 threadedly installed at the top, and the outer cylinder 101 has an outer cylinder sealing cap 105 threadedly installed at the top. These two sets of sealing caps are independent of each other, respectively sealing the top of the liquid chamber and the annular storage tank to ensure a sterile environment inside the chambers. The inner cylinder sealing cap 106 has a sliding through-hole in its center, and the outer cylinder sealing cap 105 has multiple sliding through-holes at corresponding positions, allowing the lower push rod structure to slide through, ensuring smooth push rod movement while maintaining a continuous sealed state of the chambers. The bottom end of the inner cylinder 102 is integrally connected to the discharge pipe, and the bottom end of the outer cylinder 101 is integrally connected to the discharge pipe 104. The discharge pipe and discharge pipe 104 are independent pipeline structures, respectively inserted and sealed to the two inlets of the sterile stopcock three-way valve 103. An external indwelling needle is connected to the discharge port of the sterile stopcock three-way valve 103. This structure allows the two media, liquid medicine and saline, to be independently connected to the three-way valve. The flow path is clearly divided by switching the plug, which avoids premature mixing of the media.

[0021] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, the sterile three-way stopcock valve 103 serves as a fluid confluence and flow path switching component, featuring two inlets and one outlet, and employing a sterile, sealed structure. The two inlets are respectively connected one-to-one to the outlet pipe at the bottom of the inner cylinder 102 and the discharge pipe 104 at the bottom of the outer cylinder 101. The outlet is sealed to the external indwelling needle. By rotating the stopcock core inside the three-way valve, either the drug solution chamber flow path or the annular storage tank flow path can be selectively opened, enabling time-separated output of drug solution and saline. The three-way valve has excellent internal sealing performance, ensuring unidirectional media delivery and effectively preventing backflow of patient fluids and blood into the storage component, thus avoiding contamination of the chamber.

[0022] like Figure 2 , Figure 3 , Figure 4 , Figure 5As shown, the injection assembly 2 is slidably assembled in the top area of ​​the inner cylinder 102 and the outer cylinder 101. It is the core component for realizing power push and timing control, and mainly includes a connecting block 203, a main push sleeve 201, auxiliary push rods 202, a cross-shaped slide rod 207, a spring 204, a sealing piston 205, and an annular sealing piston 206. The connecting block 203 is located at the very top of the entire injection assembly 2, serving as the force-bearing operating end and the mounting base of the component. The main push sleeve 201 is vertically fixed at the bottom center of the connecting block 203, and multiple auxiliary push rods 202 are circumferentially fixed at the bottom edge of the connecting block 203. All auxiliary push rods 202 are arranged in parallel. The bottom ends of the multiple auxiliary push rods 202 are jointly fixed to the annular sealing piston 206. The outer circular surface of the annular sealing piston 206 slides and seals with the inner wall of the outer cylinder 101, forming an outer piston structure used to seal and push the physiological saline inside the annular reservoir. The main pusher sleeve 201 is a hollow cylindrical structure with a cross-shaped sliding rod 207 nested inside. The cross-shaped sliding rod 207 can slide freely along the axial direction of the main pusher sleeve 201. The top end of the cross-shaped sliding rod 207 is elastically connected to the inner top of the main pusher sleeve 201 via a spring 204, achieving an elastic sliding fit between the cross-shaped sliding rod 207 and the main pusher sleeve 201. The bottom end of the cross-shaped sliding rod 207 extends downward and is fixedly connected to a sealing piston 205. The outer surface of the sealing piston 205 slides and seals against the inner wall of the inner cylinder 102, forming an inner piston structure used to seal and push the radioactive liquid inside the liquid chamber. In terms of structural design, the effective axial stroke of the sealing piston 205 is greater than the effective axial stroke of the annular sealing piston 206. When the connecting block 203 is pressed down, the sealing piston 205 will slide down first under the elastic action of the spring 204, pushing the radioactive drug inside the drug chamber separately. When the sealing piston 205 slides to the bottom of the drug chamber and the drug is completely pushed, the cross-shaped slide bar 207 moves to the limit position. At this time, the main push sleeve 201 can continue to move down outside the cross-shaped slide bar 207 to compress the spring 204. The auxiliary push rod 202 pushes the annular sealing piston 206 to continue to move down, pushing the physiological saline inside the annular reservoir, thus forming a fixed mechanical sequence of first injecting the drug and then flushing the tube.

[0023] like Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7As shown, the venting assembly 3 is integrated with the injection assembly 2 to achieve independent venting and sealing of the drug chamber and the annular reservoir. It mainly includes venting channel 1 305, venting channel 2 306, sealing plug 1 302, sealing plug 2 304, connecting rod 1 301, and connecting rod 2 303. Venting channel 2 306 is axially located at the center of the connecting block 203 and passes through the main push sleeve 201 and the cross-shaped slide rod 207, ultimately connecting to the drug chamber inside the inner cylinder 102, serving as a dedicated venting channel for the drug chamber. Each auxiliary push rod 202 has venting channel 1 305 axially located inside, passing through the auxiliary push rod 202 and connecting to the annular reservoir inside the outer cylinder 101, serving as a dedicated venting channel for the saline chamber. The two sets of venting channels are independent of each other, achieving separate venting of the two chambers. The bottom end of exhaust passage 2 306 is fitted with sealing plug 1 302, and the bottom end of exhaust passage 1 305 is fitted with sealing plug 2 304. Sealing plug 1 302 and sealing plug 2 304 can slide axially along the corresponding exhaust passage, blocking the exhaust passage under normal conditions to ensure the cavity is sealed. Connecting rod 1 301 is fixed to the top of sealing plug 1 302, and connecting rod 2 303 is fixed to the top of sealing plug 2 304. Connecting rod 1 301 and connecting rod 2 303 extend upward to the outside of connecting block 203, and the outer diameter of the rod is smaller than the inner diameter of the corresponding exhaust passage. Pressing down connecting rod 1 (301) and connecting rod 2 (303) will cause sealing plug 1 (302) and sealing plug 2 (304) to disengage from the bottom of exhaust channel 2 (306) and exhaust channel 1 (305), allowing air in the cavity to escape through the gap between the rods and the channels. After venting is complete, pulling connecting rod 1 (301) and connecting rod 2 (303) in the opposite direction will reset sealing plug 1 (302) and sealing plug 2 (304) upwards and re-seal the exhaust channels, completely preventing leakage of the drug solution and saline solution from the cavity, thus meeting the requirements for leak-proof use of radiopharmaceuticals.

[0024] In this embodiment, after the device is filled during the venting preparation stage, the inner cylinder 102 stores radioactive drug solution in its drug chamber, while the outer cylinder 101 stores saline solution in its annular reservoir. Air remains in the chambers. First, the connecting rod 301 and connecting rod 303 are pressed down, causing the sealing plugs 302 and 304 to move downwards, disengaging from the bottom of the venting channels 306 and 305, thus opening the venting passage. Then, the connecting block 203 is pushed, causing the sealing piston 205 to move downwards to the radioactive drug solution level, and the air inside the drug chamber is discharged through the venting channel 306. At this time, the annular sealing piston 206 has not moved to the saline solution level. After the venting operation is completed, the connecting rod 301 is pulled in the opposite direction to reset the sealing plug 302 upwards, resealing the venting channel 306 and restoring the drug chamber to a sealed state.

[0025] During the radioactive drug injection phase, the external indwelling needle connected to the outlet of the sterile stopcock three-way valve 103 is inserted into the patient's vein. The stopcock core of the sterile stopcock three-way valve 103 is rotated to open the flow path corresponding to the outlet pipe of the inner cylinder 102. Pressing down on the connecting block 203 initially does not cause any deformation of the spring 204, which can push the cross-shaped slide rod 207 to drive the sealing piston 205 to slide downward along the inner wall of the inner cylinder 102. The annular sealing piston 206 will continue to move downward. When the sealing piston 205 squeezes the radioactive drug inside the drug chamber, the drug flows into the sterile stopcock three-way valve 103 through the outlet pipe at the bottom of the inner cylinder 102, and is finally injected into the patient's body through the external indwelling needle. During this stage, the annular sealing piston 206 will continue to move along with the sealing piston 205, but channel 305 will not return to a sealed state. After the sealing piston 205 has finished compressing the radioactive drug inside the drug chamber, the annular sealing piston 206 will just stop on the surface of the saline solution. At this time, all the air inside the annular reservoir will be discharged through the exhaust channel 305. After the venting operation is completed, the connecting rod 303 is pulled in the opposite direction, causing the sealing plug 304 to return to its original position and re-seal the exhaust channel 305, restoring the annular reservoir to a sealed state.

[0026] At this point, the stopcock core of the sterile stopcock three-way valve 103 can be rotated to switch the flow path to the discharge pipe 104 side of the outer cylinder 101. Continue pressing down on the connecting block 203, causing the main push sleeve 201 to slide relative to the cross-shaped slide rod 207, further compressing the spring 204. Simultaneously, the main push sleeve 201 drives multiple auxiliary push rods 202 to move downwards synchronously through the connecting block 203, pushing the annular sealing piston 206 downwards along the inner wall of the outer cylinder 101. The annular sealing piston 206 gradually moves to the saline solution level and continues to press down, squeezing the saline solution inside the annular reservoir. The saline solution flows into the sterile stopcock three-way valve 103 through the discharge pipe 104 at the bottom of the outer cylinder 101, flowing along the original injection tubing to thoroughly flush the inner wall of the indwelling needle, flushing all residual radioactive drugs into the patient's body. This continues until the annular sealing piston 206 moves to the lowest point inside the outer cylinder 101, completely pushing the saline solution and completing the tubing flushing operation. Finally, the external indwelling needle was removed, and the device was disposed of in accordance with medical standards, thus completing the single injection procedure.

[0027] The above specific embodiments are merely several optional embodiments of the present invention. Based on the technical solutions of the present invention and the relevant teachings of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. A radiopharmaceutical injection device, characterized in that, The device includes a storage component (1), an injection component (2), an exhaust component (3), and a sterile stopcock three-way valve (103). The storage component (1) includes an inner cylinder (102) and an outer cylinder (101) coaxially sleeved. The inner cylinder (102) forms a drug solution chamber inside, and the inner wall of the outer cylinder (101) is provided with an annular storage tank. The drug solution chamber and the annular storage tank are used to store radioactive drug solution and physiological saline, respectively. The bottoms of the inner cylinder (102) and the outer cylinder (101) are independently connected to the two feed ports of the sterile stopcock three-way valve (103). The discharge port of the sterile stopcock three-way valve (103) is used to connect to an external indwelling needle. The injection assembly (2) is slidably assembled on the top of the inner cylinder (102) and the outer cylinder (101). The injection assembly (2) includes an inner and outer piston structure with elastic sliding cooperation, which respectively correspond to the sealed drug chamber and the annular reservoir. The effective axial stroke of the inner piston is greater than that of the outer piston. The injection assembly (2) can achieve independent elastic sliding and form a fixed push sequence. The exhaust assembly (3) includes independent exhaust channels and a resettable sealing structure respectively corresponding to the drug liquid chamber and the annular liquid storage tank, for independent exhaust of the two chambers and for sealing. The injection component (2) is configured as a single-step press-and-push structure. The radioactive drug is injected first, and then physiological saline is automatically pushed after the drug is pushed, so as to realize the automatic flushing of the external injection tubing.

2. The radiopharmaceutical injection device according to claim 1, characterized in that, The outer cylinder (101) is fixedly fitted at the middle position of the outer side of the inner cylinder (102), and the upper end of the outer cylinder (101) extends beyond the upper end of the inner cylinder (102). The top of the outer cylinder (101) and the top of the inner cylinder (102) are respectively provided with an independent outer cylinder sealing cap (105) and an inner cylinder sealing cap (106) to achieve independent sealing of the drug liquid chamber and the annular liquid storage tank.

3. The radiopharmaceutical injection device according to claim 1, characterized in that, The injection assembly (2) is provided with a connecting block (203) at the top. The main push sleeve (201) is fixed at the bottom center of the connecting block (203). Multiple auxiliary push rods (202) are fixed at the bottom edge of the connecting block (203). The bottom ends of the multiple auxiliary push rods (202) are fixedly connected to an annular sealing piston (206). A cross-shaped slide rod (207) is slidably nested inside the main push sleeve (201). The bottom end of the cross-shaped slide rod (207) is fixedly connected to a sealing piston (205). The sealing piston (205) is slidably sealed inside the inner cylinder (102). The annular sealing piston (206) is slidably sealed inside the outer cylinder (101).

4. A radiopharmaceutical injection device according to claim 3, characterized in that, The top of the cross-shaped slide bar (207) is elastically connected to the top of the main push sleeve (201) through a spring (204), so that the sealing piston (205) has an elastic buffer stroke during the push process, which can realize the advance sliding of the press, and after sliding into place, it is pushed synchronously with the injection assembly (2) as a whole, forming a stable drug-before-water sequential motion relationship.

5. A radiopharmaceutical injection device according to claim 1, characterized in that, The exhaust assembly (3) includes an exhaust channel two (306) located at the center and an exhaust channel one (305) located inside each auxiliary push rod (202). The exhaust channel two (306) is connected to the medicine chamber of the inner cylinder (102), and the exhaust channel one (305) is connected to the annular liquid storage tank of the outer cylinder (101), so as to realize independent exhaust operation of the medicine chamber and the saline chamber.

6. A radiopharmaceutical injection device according to claim 5, characterized in that, The bottom end of the second exhaust channel (306) is fitted with a sealing plug (302), and the bottom end of the first exhaust channel (305) is fitted with a sealing plug (304). After the sealing plug is reset, it can automatically seal the corresponding exhaust channel, ensuring that the double chamber is completely sealed and there is no medium leakage during the injection process. The top of the first sealing plug (302) and the second sealing plug (304) are respectively fixed with a connecting rod (301) extending to the outside of the structure and a connecting rod (303). The outer diameter of the connecting rod is smaller than the inner diameter of the corresponding exhaust channel.

7. A radiopharmaceutical injection device according to claim 1, characterized in that, The inner cylinder (102) is provided with a discharge pipe at the bottom, and the outer cylinder (101) is provided with a discharge pipe (104) at the bottom. The discharge pipe and the discharge pipe (104) are independently inserted and sealed to the two inlets of the sterile stopcock three-way valve (103) to realize the independent convergence of the drug solution and the physiological saline and the unidirectional output to the indwelling needle.

8. A radiopharmaceutical injection device according to claim 2, characterized in that, The outer cylinder sealing cap (105) and the inner cylinder sealing cap (106) both adopt a threaded sealing installation structure, and are respectively provided with sliding through holes for matching auxiliary push rod (202) and main push sleeve (201), which ensures the smooth sliding of the push rod while maintaining the sterile sealing performance of the cavity.

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