A syringe and injector

Abstract

The present application relates to the technical field of syringes, in particular to a syringe barrel and a syringe, comprising a liquid storage tube with a liquid storage cavity, a step ring arranged in the liquid storage cavity, and a liquid outlet arranged at the end of the liquid storage tube; a fixing member fixedly connected with the liquid storage tube; and a sealing member arranged between the step ring and the fixing member. In the syringe barrel and the syringe, the piston rod slides relative to the liquid storage tube and the sealing member during injection, and the sealing member does not slide relative to the liquid storage tube during injection, and the smoothness of the surface of the piston rod is easy to process, the wear of the sealing member is reduced, and the number of injections is increased.

Description

Technical Field

[0001] This invention relates to the technical field of syringes, and more particularly to a syringe barrel and syringe. Background Technology

[0002] A syringe typically consists of a cartridge with a small hole at the front end and a matching piston rod. Some syringes also include components such as a piston and a cone. The movement of the piston rod within the syringe achieves the functions of drawing and injecting liquid. Currently, the seal between the cartridge and the piston rod in syringes is achieved by a sealing ring located at the end of the piston rod that contacts and seals the inner wall of the cartridge. However, the inside of the cartridge is difficult to process, resulting in low surface smoothness, which affects the number of injections the syringe can deliver. Summary of the Invention

[0003] In view of the sealing problems between the existing cartridge and the piston rod, the present invention is proposed.

[0004] Therefore, one objective of this invention is to provide an injection cartridge that alters the installation relationship between the sealing ring and the injection cartridge, thereby increasing the number of injections a syringe can perform.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: an injection cylinder, comprising: a liquid storage tube having a liquid storage cavity inside, a stepped ring disposed inside the liquid storage cavity, and a liquid outlet disposed at the end of the liquid storage tube; a fixing member fixedly connected to the liquid storage tube; and a sealing member disposed between the stepped ring and the fixing member.

[0006] In a preferred embodiment of the injection cylinder of the present invention, the stepped ring includes a first step and a second step with an inner diameter greater than that of the first step; the sealing element is located between the first step and the fixing element; and the sealing element abuts against the first step.

[0007] In a preferred embodiment of the syringe of the present invention, the fixing member includes an integrally formed extrusion ring and a connecting ring; the sealing member is located between the first step and the extrusion ring; the connecting ring is connected to the liquid storage tube and abuts against the second step.

[0008] In a preferred embodiment of the syringe of the present invention, the fixing member includes a fixing cap and a T-shaped fixing ring; the sealing member is located between the first step and the fixing ring; the fixing ring abuts against the second step; the fixing cap is connected to the liquid storage tube and abuts against the fixing ring.

[0009] As a preferred embodiment of the syringe of the present invention, it further includes a gasket disposed inside the liquid storage tube, the gasket being located between the seal and the stepped ring.

[0010] In a preferred embodiment of the syringe of the present invention, a guide sleeve is provided inside the liquid storage tube, and the guide sleeve and the second step are respectively located on both sides of the first step; the inner diameter of the guide sleeve is equal to the inner diameter of the fixing member, and is less than or equal to the inner diameter of the first step.

[0011] In a preferred embodiment of the syringe of the present invention, the liquid storage tube is provided with an inlet tube, the liquid outlet is provided with a first one-way valve, and the inlet tube is provided with a second one-way valve.

[0012] As a preferred embodiment of the syringe of the present invention, the orifice diameter of the liquid outlet is 0.1-0.5 mm.

[0013] The beneficial effects of this syringe are: by fixing the seal in the reservoir, the piston rod slides relative to the reservoir and the seal during injection. At this time, the seal does not slide relative to the reservoir during injection, which can reduce the wear of the seal and increase the number of injections.

[0014] Another objective of this invention is to provide a syringe that alters the installation relationship between the sealing ring and the syringe barrel, thereby increasing the number of injections.

[0015] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a syringe, including a syringe barrel, and further including a shell having a mounting cavity at the top and a mounting groove at the bottom, wherein a liquid storage tube is disposed in the mounting cavity and the end of the liquid storage tube extends beyond the mounting cavity; a driving member, including a mounting block disposed inside the mounting cavity, a driving motor disposed on the mounting block, and a transmission cam disposed at the output end of the driving motor; a power storage member, including a piston rod slidably disposed on the mounting block and whose end is slidably inserted into the liquid storage cavity and cooperates with the sealing member, a slider disposed at one end of the piston rod and cooperating with the transmission cam, and an elastic member disposed between the piston rod and the mounting block; and a battery slidably inserted into the mounting groove.

[0016] In a preferred embodiment of the syringe of the present invention, a sliding sleeve is provided between the piston rod and the mounting block, the sliding sleeve being disposed in the mounting block and slidably connected to the piston rod; the sliding sleeve is made of plastic material.

[0017] As a preferred embodiment of the syringe of the present invention, the piston rod located in the liquid storage tube has an annular groove on its outer side, a hollow groove communicating with the liquid storage tube on its inner side, and a connecting hole between the annular groove and the hollow groove.

[0018] In a preferred embodiment of the syringe of the present invention, the mounting block is provided with a sheath connected to the liquid reservoir tube; the piston rod and the elastic element are located in the sheath.

[0019] The beneficial effects of this syringe are: during injection, the piston rod slides relative to the reservoir tube and the seal, while the seal does not slide relative to the reservoir tube. At the same time, the smoothness of the piston rod surface makes it easy to process, reducing wear on the seal and increasing the number of injections. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 An overall schematic diagram of Embodiment 1 is shown; Figure 2 An overall schematic diagram of Embodiment 2 is shown; Figure 3 A schematic diagram of the inlet pipe of Embodiment 2 is shown; Figure 4 An overall schematic diagram of Embodiment 3 is shown; Figure 5 A schematic diagram of the mounting slot in Embodiment 3 is shown; Figure 6 A schematic diagram of the battery in Embodiment 3 is shown; Figure 7 A schematic diagram of the transmission cam in Embodiment 3 is shown; Figure 8 A schematic diagram of the piston rod in Embodiment 3 is shown. Detailed Implementation

[0022] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0023] The terminology used in this invention is that which is currently widely used in the art in consideration of the function of the invention; however, these terms may vary according to the intent of those skilled in the art, precedent, or new technology in the art. Furthermore, specific terms may be chosen by the applicant, and in such cases, their detailed meanings will be described in the detailed description of the invention. Therefore, the terms used in this specification should not be construed as simple names, but rather based on their meanings and the overall description of the invention.

[0024] Example 1, referring to Figure 1The first embodiment of the present invention provides an injection cylinder, including a liquid storage tube 100, a fixing member 200 and a sealing member 300.

[0025] The liquid storage tube 100 has a liquid storage chamber 101 inside, a stepped ring 102 disposed inside the liquid storage chamber 101, and a liquid outlet 103 disposed at the end of the liquid storage tube 100; a fixing member 200 is fixedly connected to the liquid storage tube 100, wherein the diameter of the liquid outlet 103 is 0.1-0.5mm.

[0026] A sealing element 300 is disposed between the stepped ring 102 and the fixing element 200, wherein the sealing element 300 is made of a sealing gasket or an O-ring.

[0027] The sealing element 300 is fixedly installed in the liquid storage chamber 101 by the fixing element 200 and the stepped ring 102, and the contact parts between the sealing element 300 and the fixing element 200, the stepped ring 102 and the liquid storage chamber 101 are sealed.

[0028] Furthermore, the stepped ring 102 includes a first step 102a and a second step 102b with an inner diameter larger than that of the first step 102a; the sealing element 300 is located between the first step 102a and the fixing element 200; the sealing element 300 abuts against the first step 102a.

[0029] The fixing member 200 includes an integrally formed compression ring 201 and a connecting ring 202; the sealing member 300 is located between the first step 102a and the compression ring 201; the connecting ring 202 can be threadedly connected to the liquid storage tube 100, or the connecting ring 202 can be inserted into the liquid storage tube 100 and squeezed and restricted by external force. In the syringe, it can be squeezed and fixed in the liquid storage tube 100 by the sheath 509, so that the connecting ring 202 abuts against the second step 102b. Through the threaded connection between the connecting ring 202 and the liquid storage tube 100, the compression ring 201 can be fixed in the liquid storage tube 100, so that the sealing member 300 is restricted between the first step 102a and the compression ring 201, while the connecting ring 202 abuts against the second step 102b, which can control the distance between the compression ring 201 and the first step 102a, ensuring that the sealing member 300 is not over-compressed while maintaining the seal.

[0030] The sealing element 300 is relatively fixedly disposed in the liquid storage tube 100. Its position relative to the liquid storage tube 100 does not change during operation. When the liquid storage tube 100 is used to inject the liquid, the piston rod 505 moves in the liquid storage tube 100. The piston rod 505 moves relative to the sealing element 300 and seals at the contact position with the sealing element 300. The sealing element 300 seals with the piston rod 505, the fixing element 200, the stepped ring 102 and the liquid storage chamber 101, so that the liquid in the liquid storage tube 100 will not leak from the sealing element 300. When the piston rod 505 moves into the liquid storage tube 100, it will compress its internal space, thereby squeezing the internal liquid out from the outlet 103 for injection.

[0031] The surface of the piston rod 505 is easier to process than the inside of the reservoir tube 100. By fixing the seal 300 relatively in the reservoir tube 100, the service life of the seal 300 can be increased.

[0032] Furthermore, it also includes a gasket 104 disposed inside the liquid storage tube 100. The gasket 104 is located between the seal 300 and the stepped ring 102. The gasket 104 can be separated from the liquid storage tube 100, which facilitates the processing of the surface of the gasket 104, ensures the smoothness of its surface, and improves the sealing effect.

[0033] Furthermore, a guide sleeve 108 is provided inside the liquid storage tube 100. The guide sleeve 108 and the second step 102b are located on both sides of the first step 102a, respectively. The inner diameter of the guide sleeve 108 is equal to the inner diameter of the fixing member 200 and is less than or equal to the inner diameter of the first step 102a. The piston rod 505 slides through the guide sleeve 108 and the fixing member 200, and the guide sleeve 108 and the fixing member 200 play a guiding role for the piston rod 505.

[0034] Example 2, refer to Figure 2 and Figure 3 This is the second embodiment of the present invention, which differs from the first embodiment in that: the fixing member 200 includes a fixing cap 204 and a T-shaped fixing ring 203; the sealing member 300 is located between the first step 102a and the fixing ring 203; the fixing ring 203 abuts against the second step 102b; the fixing cap 204 and the liquid storage tube 100 can be connected by threads, or the fixing cap 204 can be inserted into the liquid storage tube 100 and squeezed and restricted by external force, and in the syringe, it can be fixed in the liquid storage tube 100 by squeezing through the sheath 509, so that the fixing cap 204 abuts against the fixing ring 203 and the second step 102b.

[0035] By inserting the retaining ring 203 into the liquid storage tube 100, the second step 102b can position the retaining ring 203, and the retaining ring 203 clamps and restricts the sealing element 300 by the first step 102a. At the same time, the second step 102b can support the retaining ring 203 and limit the gap between the bottom of the retaining ring 203 and the first step 102a. The retaining ring 203 can be fixed in the liquid storage tube 100 by the threaded connection between the retaining cap 204 and the liquid storage tube 100, ensuring that the sealing element 300 is restricted in the liquid storage tube 100.

[0036] Furthermore, the liquid storage pipe 100 is provided with an inlet pipe 105, the liquid outlet 103 is provided with a first check valve 106, and the inlet pipe 105 is provided with a second check valve 107.

[0037] The inlet pipe 105 is connected to the medicine container. A first one-way valve 106 is provided to allow the liquid in the storage pipe 100 to be ejected from the outlet 103, preventing external media from entering the storage pipe 100. A second one-way valve 107 is provided to allow the medicine in the medicine container to enter the storage pipe 100 from the inlet pipe 105, preventing the medicine in the storage pipe 100 from passing through the inlet pipe 105 into the medicine container. During injection, the medicine in the storage pipe 100 is ejected from the outlet 103, and then the medicine container replenishes the medicine in the storage pipe 100, enabling multiple injections.

[0038] The remaining structure is the same as that in Example 1.

[0039] Example 3, referring to Figures 4-8 In a third embodiment of the present invention, a syringe is provided, including a syringe barrel, a housing 400, a drive member 500, a power storage member 504, and a battery 600.

[0040] The outer casing 400 has a mounting cavity 401 at the top and a mounting groove 402 at the bottom. A liquid storage tube 100 is disposed in the mounting cavity 401, with its end extending beyond the mounting cavity 401. A battery 600 is slidably inserted into the mounting groove 402. The mounting groove 402 has retaining strips 403 on both sides. The battery 600 has a retaining groove 601 that cooperates with the retaining strips 403. The battery 600 is inserted into the retaining strips 403 through the retaining grooves 601, and the retaining strips 403 support the battery 600. During use, this prevents the battery 600 from falling due to its own weight. The battery 600 is horizontally inserted into the mounting groove 402. During injection operations, the battery 600 is supported by the retaining strips 403, which can maintain the stability of the battery 600 installation and prevent it from falling out of the mounting groove 402.

[0041] The drive unit 500 includes a mounting block 501 disposed inside the mounting cavity 401, a drive motor 502 disposed on the mounting block 501, and a transmission cam 503 disposed at the output end of the drive motor 502.

[0042] The power storage component 504 includes a piston rod 505 slidably disposed on the mounting block 501 and whose end is slidably inserted into the liquid storage chamber 101 to cooperate with the seal 300; a slider 506 disposed at one end of the piston rod 505 and cooperating with the transmission cam 503; and an elastic element 507 disposed between the piston rod 505 and the mounting block 501, wherein the elastic element 507 is made of a spring or a metal sheet, and the piston rod 505 slides through the fixing member 200 and is inserted into the liquid storage tube 100 to cooperate with the seal 300.

[0043] The transmission cam 503 includes an initial plane 503a, a climbing surface 503b disposed at the end of the initial plane 503a, and a terminal plane 503c disposed at the end of the climbing surface 503b. The climbing surface 503b is spiral and rotates no more than one revolution. The initial plane 503a and the terminal plane 503c are parallel and their ends coincide or intersect.

[0044] Specifically, when the transmission cam 503 rotates with the drive motor 502, it can push the slider 506 to move along the initial plane 503a, the climbing surface 503b, and the terminal plane 503c. In the initial state, at the initial plane 503a of the slider 506, as the drive motor 502 rotates, it drives the transmission cam 503 to rotate. The initial plane 503a, the climbing surface 503b, and the terminal plane 503c sequentially push the slider 506 to move, thereby driving the piston rod 505 to move and compress the accumulator 504. When the slider 506 reaches the terminal plane 503... Stop at point c. At this time, the piston rod 505 completes its final energy storage. As the drive motor 502 rotates, it drives the transmission cam 503 to rotate again. The slider 506 will leave the end of the terminal plane 503c. At this time, the slider 506 is released from its restraint, and the energy storage component 504 will be released. This will cause the piston rod 505 to pop out and move in the liquid storage tube 100 for injection. At the same time, the slider 506 moves back to the initial plane 503a. As the drive motor 502 rotates, it drives the transmission cam 503 to rotate, which can compress and store energy in the energy storage component 504 again for injection.

[0045] Furthermore, the mounting block 501 is provided with a sheath 509 that is connected to the liquid storage tube 100; the piston rod 505 and the elastic element 507 are located in the sheath 509.

[0046] The connection between the inlet pipe 105 and the storage pipe 100 is located at the first step 102a, through which the liquid medicine enters the storage pipe 100. The piston rod 505 located in the storage pipe 100 has an annular groove 505a on its outer side and a hollow groove 505b communicating with the storage pipe 100 on its inner side, as well as a connecting hole 505c between the annular groove 505a and the hollow groove 505b. The piston rod 505 is in contact with the inner wall of the first step 102a. When the piston rod 505 is in contact with the inner wall of the first step 102a, the liquid medicine in the medicine container is not easy to enter the storage pipe 100. However, the arrangement of the annular groove 505a, the connecting hole 505c and the hollow groove 505b allows the liquid medicine in the medicine container to first enter the annular groove 505a, and then enter the storage pipe 100 through the connecting hole 505c and the hollow groove 505b.

[0047] During injection, the piston rod 505 moves towards the inside of the reservoir tube 100. At this time, the annular groove 505a is misaligned with the inlet tube 105, making it difficult for the liquid to enter the reservoir tube 100. The liquid in the reservoir tube 100 is injected out from the outlet 103. Afterward, the piston rod 505 is withdrawn from the reservoir tube 100, and the pressure in the reservoir tube 100 decreases. When the annular groove 505a coincides with the inlet tube 105, the liquid in the medicine container enters the reservoir tube 100 from the annular groove 505a, the connecting hole 505c, and the hollow groove 505b to replenish the liquid, facilitating multiple injections.

[0048] Furthermore, a sliding sleeve 508 is provided between the piston rod 505 and the mounting block 501. The sliding sleeve 508 is disposed in the mounting block 501 and slidably connected to the piston rod 505. The sliding sleeve 508 is made of plastic material.

[0049] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A syringe, characterized in that: include, The liquid storage tube (100) has a liquid storage chamber (101) inside, a stepped ring (102) disposed inside the liquid storage chamber (101), and a liquid outlet (103) disposed at the end of the liquid storage tube (100). A fastener (200) is fixedly connected to the liquid storage tube (100); and, A sealing element (300) is disposed between the stepped ring (102) and the fixing element (200); The stepped ring (102) includes a first step (102a) and a second step (102b) with an inner diameter larger than that of the first step (102a); The sealing element (300) is located between the first step (102a) and the fixing element (200); The seal (300) abuts against the first step (102a); The fastener (200) includes an integrally formed extrusion ring (201) and a connecting ring (202). The seal (300) is located between the first step (102a) and the compression ring (201); The connecting ring (202) is connected to the liquid storage tube (100) and abuts against the second step (102b).

2. The injection cartridge according to claim 1, characterized in that: It also includes a gasket (104) disposed inside the liquid storage tube (100), the gasket (104) being located between the seal (300) and the stepped ring (102).

3. The injection cartridge according to claim 1, characterized in that: The liquid storage tube (100) is provided with a guide sleeve (108) inside, and the guide sleeve (108) and the second step (102b) are located on both sides of the first step (102a); The inner diameter of the guide sleeve (108) is equal to the inner diameter of the fastener (200), and is less than or equal to the inner diameter of the first step (102a).

4. The syringe according to claim 2, characterized in that: The liquid storage pipe (100) is provided with an inlet pipe (105), the outlet (103) is provided with a first check valve (106), and the inlet pipe (105) is provided with a second check valve (107).

5. The injection cartridge according to claim 1 or 4, characterized in that: The diameter of the outlet (103) is 0.1-0.5 mm.

6. A syringe, characterized in that: The syringe as described in claim 1 or 4 further includes a housing (400) having a mounting cavity (401) at the top and a mounting groove (402) at the bottom, wherein the liquid storage tube (100) is disposed in the mounting cavity (401) and the end of the liquid storage tube (100) extends beyond the mounting cavity (401). The driving component (500) includes a mounting block (501) disposed inside the mounting cavity (401), a drive motor (502) disposed on the mounting block (501), and a transmission cam (503) disposed at the output end of the drive motor (502). The energy storage component (504) includes a piston rod (505) slidably disposed on the mounting block (501) and whose end is slidably inserted into the liquid storage chamber (101) and cooperates with the seal (300); a slider (506) disposed at one end of the piston rod (505) and cooperates with the transmission cam (503); and an elastic member (507) disposed between the piston rod (505) and the mounting block (501); and, The battery (600) is slidably inserted into the mounting slot (402).

7. The syringe according to claim 6, characterized in that: A sliding sleeve (508) is provided between the piston rod (505) and the mounting block (501), and the sliding sleeve (508) is disposed in the mounting block (501) and slidably connected to the piston rod (505); The sliding sleeve (508) is made of plastic.

8. The syringe according to claim 7, characterized in that: An annular groove (505a) is provided on the outside of the piston rod (505) located in the liquid storage tube (100), a hollow groove (505b) communicating with the liquid storage tube (100) is provided on the inside of the piston rod (505), and a connecting hole (505c) is provided between the annular groove (505a) and the hollow groove (505b).

9. The syringe according to claim 8, characterized in that: The mounting block (501) is provided with a sheath (509) that is connected to the liquid storage tube (100). The piston rod (505) and the elastic element (507) are located in the sheath (509).

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