A mixed injection device for a medical solution and a method of using the same

Abstract

This invention provides a drug solution mixing and injection device, comprising a syringe, a stirring assembly, and a needle. The syringe includes a syringe barrel with an open front end, a piston slidably mounted inside the syringe barrel, and a gap forming a cavity between the piston and the front end of the syringe barrel. The front end of the syringe barrel is provided with a sealing element, forming a sealed cavity for pre-filling drug powder. The stirring assembly is detachably mounted on the front end of the syringe barrel for stirring the mixed drug in the sealed cavity after the drug solution is injected. The needle is detachably mounted on the front end of the syringe barrel for injecting the drug solution after stirring. This drug solution mixing and injection device is compact, easy to operate, has good stirring effect, and low production cost, making it easy to promote and use.

Description

Technical Field

[0001] This invention relates to a syringe, and more particularly to a drug mixing and injection device and its method of use. Background Technology

[0002] In the industry, pre-filled powdered medicines require mixing with liquid before use. However, due to the characteristics of some medicines, clumping can occur after liquid injection, preventing thorough mixing and affecting the use of the medicine. The current industry practice is to pour the powder and liquid into a bowl in a certain ratio, stir and mix, and then use a syringe to extract the mixture. While this method can solve the clumping problem, it results in waste of liquid residue in the bowl, especially for paste-like medicines. Furthermore, the bowl is open, allowing impurities, bacteria, and air from the air to enter the medicine during stirring, affecting its quality. Summary of the Invention

[0003] Technical problems to be solved

[0004] The technical problem to be solved by the present invention is to provide a drug solution mixing and injection device that is compact in structure, easy to operate, free from clumping, and has a good mixing effect.

[0005] Technical solutions to the problem

[0006] This invention provides a drug solution mixing and injection device, comprising:

[0007] The syringe includes a syringe barrel 1 with an open front end, a piston 21 slidably mounted inside the syringe barrel 1, a piston rod on the piston 21, the end of the piston rod extending rearward to the outside of the syringe barrel 1 and forming a push rod 2, a gap between the piston 21 and the front end of the syringe barrel 1 forming a cavity, and a sealing element 11 at the front end of the syringe barrel 1 forming a sealed cavity 10 for pre-filling powder.

[0008] A stirring assembly is detachably mounted on the front end of the syringe 1 for stirring the mixed drugs in the sealed cavity after the drug solution is injected;

[0009] The needle 5 is detachably mounted on the front end of the syringe 1 and is used to inject the drug solution after stirring.

[0010] Furthermore, the stirring assembly includes a cap 3 and a stirrer 4. The cap 3 can be detachably installed at the end of the syringe 1. The stirrer 4 includes a main shaft 42. The cap 3 has a shaft hole that allows the main shaft 42 to pass through. The head of the main shaft 42 is provided with a stirring blade 41 that can be inserted into the syringe 1 for stirring. The tail of the main shaft 42 is provided with a handle 43 for driving the main shaft 42 to rotate so that the stirring blade can stir.

[0011] Furthermore, the main shaft 42 includes a first shaft body 421, a second shaft body 422, and a third shaft body 423 connected in sequence. The stirring blade is installed at the end of the first shaft body 421. The outer wall of the second shaft body 422 is provided with external threads to form a screw. The inner wall of the shaft hole is provided with internal threads that mesh with the screw. The first shaft body 421 and the second shaft body 422 are smooth shafts and their length is greater than or equal to the axial length of the shaft hole, and they can realize the idling of the stirring blade. The handle is fixed to the end of the third shaft body.

[0012] Furthermore, the ratio of the diameter of the stirring blade 41 to the inner diameter of the syringe is greater than or equal to 0.8 and less than or equal to 0.95.

[0013] Furthermore, the sidewall of the stirring blade 41 is evenly distributed with spiral stirring blades. The front end of the stirring blade can fit against the end face of the piston and form a first scraping surface, and the rear end of the stirring blade can fit against the inner end face of the cap and form a second scraping surface.

[0014] Furthermore, the end of the syringe 1 is provided with a protective cap for protecting the seal.

[0015] Furthermore, the direction of rotation of the stirring blade is the same as that of the external thread, and its lead is greater than that of the external thread.

[0016] Furthermore, the lead of the external thread is greater than or equal to 3 mm and less than or equal to 6 mm, and the lead of the stirring blade is greater than or equal to 20 mm and less than or equal to 30 mm.

[0017] Furthermore, the outer wall of the head of the syringe 1 is provided with an external thread or an annular groove 12, and the inner wall of the cap or the needle is provided with an internal thread corresponding to the external thread or an annular protrusion 311 corresponding to the annular groove.

[0018] Meanwhile, the present invention also provides a method for using a drug solution mixing and injection device, which includes the following steps:

[0019] S1. Remove the protective cap from the syringe head;

[0020] S2. Injection: Draw up the drug solution with a regular syringe, insert the needle of the regular syringe into the seal, and inject the drug solution into the sealed cavity of the syringe. During the injection process, pull the plunger backward and increase the volume of the sealed cavity so that the volume of the sealed cavity is greater than the volume of the mixture.

[0021] S3. Remove the seal: Place the syringe head upwards and vertically, and remove the seal from the syringe head.

[0022] S4. Install the stirring assembly, align the stirring blade with the syringe and insert it into the syringe, and tighten or fasten the cap to the end of the syringe.

[0023] S5. Stirring: Turn the handle to cause the stirring blade to rotate radially and move axially under the drive of the thread, thus stirring the mixed medicine in the syringe. When the stirring blade is in the inner limit position, the third shaft at the tail of the main shaft is located in the shaft hole and can rotate freely. Adjust the piston position and make the first scraping surface of the stirring blade head contact the piston end face, rotate and scrape off the adhesive at the piston end. When the stirring blade is in the outer limit position, the first shaft at the head of the main shaft is located in the shaft hole and can rotate freely. The second scraping surface at the tail of the stirring blade contacts the inner end face of the cap, rotate and scrape off the adhesive on the inner end face of the cap.

[0024] S6. Repeat step S5 until the mixed medicine solution in the syringe is fully combined;

[0025] S7. Remove the stirring assembly from the syringe head and install the needle for later use.

[0026] Beneficial effects

[0027] This invention relates to a drug mixing and injection device. A sealed cavity is provided within the syringe for pre-filling drug powder, which also serves as a medicine bottle, stirring container, and syringe. It features a compact structure, low production cost, and ease of operation and use. A sealing element ensures good sealing, improving the reliability and shelf life of the internal drug storage, while also facilitating puncture and drug injection. A protective cap protects the sealing element from damage during transportation or storage, enhancing reliability and stability. A detachable stirring assembly reduces production cost, effectively stirring the mixture within the syringe, and is easy to install and operate. The use of a screw and helical blades provides a lead difference during rotation, resulting in excellent stirring and thorough mixing of the drug solution. Smooth rods at both ends of the shaft allow for free rotation of the stirring blades, facilitating the scraping of clumps from the piston and cap ends, improving stirring efficiency, and preventing drug adhesion. This invention's drug mixing and injection device is compact, easy to operate, provides excellent stirring, and has low production cost, making it suitable for widespread use. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of the drug solution mixing and injection device of the present invention;

[0029] Figure 2 This is a cross-sectional view of the drug solution mixing and injection device of the present invention;

[0030] Figure 3 This is a schematic diagram of the installation of the stirring assembly of the drug solution mixing and injection device of the present invention;

[0031] Figure 4 This is a cross-sectional view of the stirring assembly of the drug solution mixing and injection device of the present invention;

[0032] Figure 5This is an exploded structural diagram of the stirring assembly of the drug solution mixing and injection device of the present invention;

[0033] Figure 6 This is a schematic diagram of the structure of the cap of the drug solution mixing and injection device of the present invention;

[0034] Figure 7 This is a schematic diagram of the cap of the drug solution mixing and injection device of the present invention from another angle;

[0035] Figure 8 This is a schematic diagram of the structure of the stirrer in the drug solution mixing and injection device of the present invention;

[0036] Figure 9 A schematic diagram of the needle installation in the drug solution mixing and injection device of the present invention. Detailed Implementation

[0037] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0038] See Figures 1-9 The present invention provides a drug solution mixing and injection device, which includes a syringe, a stirring assembly and a needle 5.

[0039] The syringe includes a transparent syringe barrel 1 with an open front end. A piston 21 is slidably mounted inside the syringe barrel 1, and a piston rod is mounted on the piston 21. The end of the piston rod extends rearward to the outside of the syringe barrel 1 to form a push rod 2, which is used to push and pull and control the movement of the piston. A gap is provided between the piston 21 and the front end of the syringe barrel 1, forming a cavity. At the same time, a sealing element 11 is provided at the front end of the syringe barrel 1, which makes the cavity a sealed chamber 10 for pre-filling with powder. At the time of manufacture, the powder is filled into the sealed chamber of the syringe barrel, at which point the syringe barrel is equivalent to a medicine bottle. The sealing element is a rubber stopper or aluminum foil to ensure the sealing of the sealed chamber. The volume of the sealed chamber is 10%-30% of the total volume of the syringe barrel.

[0040] To protect the seal and prevent it from breaking during transportation or storage, a protective cap is provided at the end of the syringe 1. This protective cap covers the seal and protects it.

[0041] The stirring assembly and needle 5 can be detachably (replaceably) mounted on the front end of the syringe 1 and can be replaced according to different steps. At the factory, the syringe, stirring assembly and needle are packaged separately and have no assembly relationship.

[0042] The following is a detailed explanation:

[0043] A stirring assembly is detachably mounted on the front end of the syringe 1 for stirring the mixed drugs in the sealed cavity after injection. Specifically, the stirring assembly includes a cap 3 and a stirrer 4. The cap 3 is detachably mounted on the end of the syringe 1. The cap 3 includes a cylindrical cap body 31, one end of which is constricted to form a cylindrical connecting part 32. The connecting part 32 has a hole forming a shaft hole, and an internal thread is provided in the shaft hole. The stirrer 4 includes a main shaft 42, a cap... The shaft hole on the cap 3 allows the main shaft 42 to pass through. The head of the main shaft 42 is equipped with a stirring blade 41, which can be inserted into the syringe 1 for stirring. The tail of the main shaft 42 is equipped with a handle 43, which is used for manual operation to rotate the main shaft 42, thereby rotating the stirring blade and achieving stirring. In this embodiment, the main shaft 42 includes a first shaft body 421, a second shaft body 422, and a third shaft body 423 connected sequentially and coaxially. The stirring blade is installed at the end of the first shaft body 421. The second shaft 422 has an external thread on its outer wall, forming a screw. This screw can engage with the thread in the shaft hole. The first shaft 421 and the second shaft 422 are smooth shafts, i.e., cylinders. The outer diameter of the screw is larger than the diameter of the first and second shafts. Simultaneously, the length of the first and second shafts is greater than or equal to the axial length of the shaft hole, so that when the first and second shafts are located within the shaft hole, the stirring blades can rotate freely. To achieve a better stirring effect, in this embodiment… The ratio of the diameter of the stirring blade 41 to the inner diameter of the syringe is greater than or equal to 0.8 and less than or equal to 0.95. Its cross-sectional area is large and the stirring effect is good. Multiple spiral stirring blades are evenly distributed around the side wall of the stirring blade 41. The front end of the stirring blade can fit against the end face of the piston to form a first scraping surface, which is used to scrape off the clumps (adhesives) on the end face of the piston. The rear end of the stirring blade can fit against the inner end face of the cap to form a second scraping surface, which is used to scrape off the clumps (adhesives) on the inner end face of the cap.

[0044] In this embodiment, the rotation direction of the stirring blade is the same as that of the external thread, and the lead of the stirring blade is greater than that of the external thread; wherein, the lead of the external thread is greater than or equal to 3mm and less than or equal to 6mm, preferably 4mm, and the lead of the stirring blade is greater than or equal to 20mm and less than or equal to 30mm, preferably 25mm. During the stirring process, the different lead difference between the two components is utilized to achieve a good stirring effect.

[0045] The needle 5 is detachably mounted on the front end of the syringe 1 for injecting the drug solution after mixing. Specifically, the needle includes a cap that can be mounted on the front end of the syringe, and a needle body 51 is fixed on the cap. The needle body has a needle hole. After mixing, the needle is replaced to enable injection.

[0046] The outer wall of the head of the syringe 1 is provided with an external thread or an annular groove 12 for installing the needle of the stirring component. Therefore, the inner wall of the cap or needle (cap body) is provided with an internal thread corresponding to the external thread or an annular protrusion 311 corresponding to the annular groove, which can realize threaded installation or snap-fit ​​installation.

[0047] To improve sealing, a sealing gasket is provided at the inner end of the cap or needle (cap body) to enhance sealing after installation.

[0048] Meanwhile, the present invention also provides a method for using a drug solution mixing and injection device, which includes the following steps:

[0049] S1. Remove the protective cap from the syringe head;

[0050] S2. Injection: Draw up the liquid medicine using a regular syringe. Insert the needle of the regular syringe into the seal and inject the liquid medicine into the sealed cavity of the syringe. During the injection process, pull the push rod backward and increase the volume of the sealed cavity so that the volume of the sealed cavity is greater than the volume of the mixture, which provides space for the installation of the stirring assembly.

[0051] S3. Remove the seal: Place the syringe head upwards and vertically, and remove the seal from the syringe head. The seal is a rubber stopper or aluminum foil.

[0052] S4. Install the stirring assembly, align the stirring blade with the syringe and insert it into the syringe, and tighten or fasten the cap to the end of the syringe.

[0053] S5. Stirring: Turn the handle to cause the stirring blade to rotate radially and move axially under the drive of the thread, thus stirring the mixed medicine in the syringe. When the stirring blade is in the inner limit position, the third shaft at the tail of the main shaft is located in the shaft hole and can rotate freely. Adjust the piston position and make the first scraping surface of the stirring blade head contact the piston end face, rotate and scrape off the adhering material (clumps) at the piston end. When the stirring blade is in the outer limit position, the first shaft at the head of the main shaft is located in the shaft hole and can rotate freely. The second scraping surface at the tail of the stirring blade contacts the inner end face of the cap, rotate and scrape off the adhering material (clumps) on the inner end face of the cap.

[0054] S6. Repeat step S5 until the mixed medicine solution in the syringe is fully combined and observed through the transparent syringe.

[0055] S7. Remove the stirring assembly from the syringe head and replace the needle for later use.

[0056] This invention relates to a drug mixing and injection device. A sealed cavity is provided within the syringe for pre-filling drug powder, which also serves as a medicine bottle, stirring container, and syringe. It features a compact structure, low production cost, and ease of operation and use. A sealing element ensures good sealing, improving the reliability and shelf life of the internal drug storage, while also facilitating puncture and drug injection. A protective cap protects the sealing element from damage during transportation or storage, enhancing reliability and stability. A detachable stirring assembly reduces production cost, effectively stirring the mixture within the syringe, and is easy to install and operate. The use of a screw and helical blades provides a lead difference during rotation, resulting in excellent stirring and thorough mixing of the drug solution. Smooth rods at both ends of the shaft allow for free rotation of the stirring blades, facilitating the scraping of clumps from the piston and cap ends, improving stirring efficiency, and preventing drug adhesion. This invention's drug mixing and injection device is compact, easy to operate, provides excellent stirring, and has low production cost, making it suitable for widespread use.

[0057] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A drug solution mixing and injection device, characterized in that, include: A syringe includes a syringe barrel with an open front end, a piston slidably mounted inside the syringe barrel, a piston rod on the piston, the end of the piston rod extending rearward to the outside of the syringe barrel and forming a push rod, a gap forming a cavity between the piston and the front end of the syringe barrel, a seal being provided at the front end of the syringe barrel to form a sealed cavity for pre-filling powder; and a protective cap being provided at the end of the syringe barrel to protect the seal. A stirring assembly is detachably mounted on the front end of the syringe for stirring the mixed drugs in the sealed cavity after the drug solution is injected; The needle is detachably mounted at the front end of the syringe for injecting the drug solution after mixing. The stirring assembly includes a cap and a stirrer. The cap can be detachably installed at the end of the syringe. The stirrer includes a main shaft. The cap has a shaft hole that allows the main shaft to pass through. The head of the main shaft has a stirring blade that can be inserted into the syringe for stirring. The tail of the main shaft has a handle for driving the main shaft to rotate so that the stirring blade can stir. The main shaft includes a first shaft body, a second shaft body, and a third shaft body connected in sequence. The stirring blade is installed at the end of the first shaft body. The outer wall of the second shaft body is provided with external threads to form a screw. The inner wall of the shaft hole is provided with internal threads that mesh with the screw. The first shaft body and the third shaft body are smooth shafts and their length is greater than or equal to the axial length of the shaft hole, and they can realize the idling of the stirring blade. The handle is fixed to the end of the third shaft body. The sidewall of the stirring blade is evenly distributed with spiral stirring blades. The front end of the stirring blade can fit against the end face of the piston and form a first scraping surface, and the rear end of the stirring blade can fit against the inner end face of the cap and form a second scraping surface.

2. The drug solution mixing and injection device as described in claim 1, characterized in that: The ratio of the diameter of the stirring blade to the inner diameter of the syringe is greater than or equal to 0.8 and less than or equal to 0.

95.

3. The drug solution mixing and injection device as described in claim 1, characterized in that: The direction of rotation of the stirring blade is the same as that of the external thread, and its lead is greater than that of the external thread.

4. The drug solution mixing and injection device as described in claim 1, characterized in that: The lead of the external thread is greater than or equal to 3 mm and less than or equal to 6 mm, and the lead of the stirring blade is greater than or equal to 20 mm and less than or equal to 30 mm.

5. The drug solution mixing and injection device as described in claim 1, characterized in that: The outer wall of the syringe head is provided with an external thread or an annular groove, and the inner wall of the cap or the needle is provided with an internal thread corresponding to the external thread or an annular protrusion corresponding to the annular groove.

6. A method of using a drug solution mixing and injection device as described in any one of claims 1-5, characterized in that, Includes the following steps: S1. Remove the protective cap from the syringe head; S2. Injection: Draw up the drug solution with a regular syringe, insert the needle of the regular syringe into the seal, and inject the drug solution into the sealed cavity of the syringe. During the injection process, pull the plunger backward and increase the volume of the sealed cavity so that the volume of the sealed cavity is greater than the volume of the mixture. S3. Remove the seal: Place the syringe head upwards and vertically, and remove the seal from the syringe head. S4. Install the stirring assembly, align the stirring blade with the syringe and insert it into the syringe, and tighten or fasten the cap to the end of the syringe. S5. Stirring: Turn the handle to cause the stirring blade to rotate radially and move axially under the drive of the thread, thus stirring the mixed medicine in the syringe. When the stirring blade is in the inner limit position, the third shaft at the tail of the main shaft is located in the shaft hole and can rotate freely. Adjust the piston position and make the first scraping surface of the stirring blade head contact the piston end face, rotate and scrape off the adhesive at the piston end. When the stirring blade is in the outer limit position, the first shaft at the head of the main shaft is located in the shaft hole and can rotate freely. The second scraping surface at the tail of the stirring blade contacts the inner end face of the cap, rotate and scrape off the adhesive on the inner end face of the cap. S6. Repeat step S5 until the mixed medicine solution in the syringe is fully combined; S7. Remove the stirring assembly from the syringe head and install the needle for later use.

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