Pre-filled portable injector

Abstract

The utility model relates to a pre-filling type portable syringe which comprises a needle cylinder, a sealing piece, a piston pushing mechanism, a puncturing mechanism used for puncturing the sealing piece and a limiting mechanism used for limiting the piston pushing mechanism, the sealing piece is arranged on a nipple of the needle cylinder, and the piston pushing mechanism is partially arranged in the needle cylinder. The limiting mechanism is arranged at a tube opening of the needle cylinder and detachably connected with the piston pushing mechanism, the puncture mechanism is arranged in the piston pushing mechanism, the end, close to a nipple, of the puncture mechanism penetrates out of the piston pushing mechanism, and the puncture mechanism moves in the axial direction of the needle cylinder. The syringe has the advantages that external air and bacteria can be effectively prevented from entering liquid medicine in the needle tube, and the liquid medicine can be quickly injected in an intravenous mode.

Description

Technical Field

[0001] The utility model relates to the technical field of medical instruments, in particular to a prefilled portable syringe. Background Art

[0002] Although the existing pre-filled injections have been pre-filled with liquid medicine in the syringe, they still need to be pushed by medical staff, which is not suitable for on-site treatment in field operations where there are many wounded and insufficient medical staff. The wounded generally need infusions. When using pre-filled injections to inject medicine into infusion bottles, it is easy for the medicine to be infected with bacteria and for outside air to mix into the medicine in the syringe due to human operating errors when removing the sealing film. The existing public announcement number is CN213220044U, and the name is "A Pre-filled Anti-Needlestick Syringe". It still requires manual push injection of liquid medicine and the needle needs a needle cover to prevent contamination. The needle cover is easy to bump and fall off, and the risk of infection of the medicine is high. Summary of the invention

[0003] In order to solve the above problems, the purpose of the utility model is to provide a prefilled portable syringe, which can effectively prevent outside air and bacteria from entering the medicine in the needle tube, and can also quickly inject the medicine intravenously.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A prefilled portable syringe comprises a syringe, a sealing member, a piston pushing mechanism, a puncture mechanism for puncturing the sealing member, and a limiting mechanism for limiting the piston pushing mechanism, wherein the sealing member is arranged on the nipple of the syringe, the piston pushing mechanism is partially arranged in the syringe, the limiting mechanism is arranged at the tube mouth of the syringe and is detachably connected to the piston pushing mechanism, the puncture mechanism is arranged in the piston pushing mechanism and the nipple-proximal end of the puncture mechanism passes through the piston pushing mechanism, and the puncture mechanism moves axially along the syringe.

[0006] More preferably, the puncture mechanism includes a handle and a puncture piece with a sharp head, the puncture piece is arranged in the piston pushing mechanism and the head of the puncture piece passes through the piston pushing mechanism, the puncture piece is sealed to the piston, the tail of the puncture piece is fixedly connected to the handle, the handle is arranged outside the piston pushing mechanism, and the handle drives the puncture piece to move axially along the syringe.

[0007] More preferably, the handle is arranged on the side of the piston pushing mechanism, and the piston pushing mechanism is provided with a sliding groove for cooperating with the sliding of the handle. The end of the sliding groove is provided with a limiting groove for fixing the handle. The handle is rotated to make the handle leave the limiting groove, the limit is released, and the puncture member moves toward the direction of the syringe nipple.

[0008] More preferably, the handle is arranged at the rear of the piston pushing mechanism, a limit opening is provided at the bottom of the piston pushing mechanism, the handle comprises a bottom plate and a limit plate, the cross section of the limit plate is the same shape as the limit opening and the area of ​​the cross section is smaller than the area of ​​the limit opening, the handle is rotated to make the limit plate and the limit opening match each other, the limit is released, and the puncture member moves toward the direction of the syringe nipple.

[0009] More preferably, a positioning block is provided at the nipple-proximal end of the puncture member, and the cross section of the positioning block is larger than the cross section of the nipple.

[0010] More preferably, the piercing member is a needle.

[0011] More preferably, the piston pushing mechanism comprises a piston and a push rod which are fixedly connected to each other, the piston is arranged in the syringe, the push rod is hollow and the puncture mechanism is arranged in the push rod.

[0012] More preferably, the piston pushing mechanism further comprises an elastic member, the elastic member is sleeved on the push rod and two ends of the elastic member are respectively in contact with the piston and the limiting mechanism.

[0013] More preferably, the limiting mechanism includes a base and a limiting block, the limiting block is arranged on the base, the base is arranged at the tube mouth of the syringe, the limiting block is provided with a positioning protrusion, the piston pushing mechanism is provided with a positioning hole matching the positioning protrusion, the piston pushing mechanism passes through the base, and the limiting block is detachably connected to the piston pushing mechanism through the positioning protrusion and the positioning hole, the number of the positioning holes is at least two and the positioning holes are arranged along the axial direction of the syringe.

[0014] More preferably, a positioning rod is provided on the base, a positioning groove is provided on the limit block, and the positioning rod and the positioning groove are engaged with each other.

[0015] The utility model has the following beneficial effects:

[0016] 1. The utility model is a prefilled portable syringe, in which a puncture mechanism is arranged in a piston pushing mechanism, so that the seal between the injection and the infusion set can be released after they are fully connected, ensuring that outside air and bacteria will never enter the liquid in the needle tube, making the injection safer to use.

[0017] 2. The utility model is a prefilled portable syringe, in which an elastic member is arranged in the piston pushing mechanism, so that the automatic pushing and injection of liquid is realized, the operation is convenient and fast, and manpower and time are saved.

[0018] 3. The prefilled portable syringe of the utility model has the advantages of simple and smart structure and low cost, and is extremely suitable for promotion as a disposable medical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall structure of the first embodiment of the present utility model;

[0020] Figure 2 This is a schematic diagram of the internal structure of the first embodiment of the utility model (without the syringe);

[0021] Figure 3 This is a front view of the first embodiment of the present utility model;

[0022] Figure 4 It is a rear view of the first embodiment of the utility model;

[0023] Figure 5 It is a structural schematic diagram of the limit block of the utility model;

[0024] Figure 6 This is a schematic diagram of the puncture mechanism of the first embodiment of the utility model;

[0025] Figure 7 It is a three-dimensional diagram of the second embodiment of the utility model;

[0026] Figure 8 This is a schematic diagram of the internal structure of the second embodiment of the utility model (without the syringe);

[0027] Fig. 9 This is a schematic diagram of the seal member being broken in the second embodiment of the present utility model;

[0028] Fig.10 It is a rear view of the second embodiment of the utility model;

[0029] Fig.11 This is a schematic diagram of the puncture mechanism of the second embodiment of the present utility model.

[0030] Description of reference numerals:

[0031] 10. Syringe; 11. Nipple; 20. Sealing member; 30. Piston pushing mechanism; 31. Piston; 32. Push rod; 321. Sliding groove; 322. Limiting groove; 323. Positioning hole; 33. Elastic member; 34. Limiting opening; 40. Piercing mechanism; 41. Handle; 411. Bottom plate; 412. Limiting plate; 42. Piercing member; 43. Positioning block; 50. Limiting mechanism; 51. Base; 511. Positioning rod; 52. Limiting block; 521. Positioning convex point; 522. Positioning groove. DETAILED DESCRIPTION

[0032] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0033] Embodiment 1

[0034] See also Figures 1 to 4A prefilled portable syringe comprises a syringe 10, a sealing member 20, a piston push mechanism 30, a puncture mechanism 40 for puncturing the sealing member 20, and a limiting mechanism 50 for limiting the piston push mechanism 30. The sealing member 20 is arranged on the nipple 11 of the syringe 10, the piston push mechanism 30 is partially arranged in the syringe 10, the limiting mechanism 50 is arranged at the nozzle of the syringe 10 and is detachably connected to the piston push mechanism 30, the puncture mechanism 40 is arranged in the piston push mechanism 30 and the end of the puncture mechanism 40 near the nipple 11 passes through the piston push mechanism 30, and the puncture mechanism 40 moves axially along the syringe 10. The syringe 10 is filled with a pre-injected liquid, so a sealing member 20 must be arranged on the nipple 11 of the syringe 10 to prevent the liquid from flowing out. The syringe 10 is also provided with a piston push mechanism 30, and the piston 31 in the piston push mechanism 30 is in sealed sliding connection with the inner wall of the syringe 10. The pre-injected liquid medicine is stored in the syringe 10 and is located between the nipple 11 and the piston 31. Since the pre-filled syringe is connected to the infusion set, the seal 20 needs to be torn open so that the liquid in the syringe 10 can flow into the infusion set. When the seal 20 is torn open manually and the nipple 11 is connected to the infusion set, there is a risk of hand bacteria contaminating the liquid, and there is also a risk of bacterial contamination due to the liquid contacting with the ambient air, and a risk of outside air entering the needle tube. Therefore, the utility model designs a puncture mechanism 40 in the pre-filled syringe, so that the nipple 11 is first connected to the infusion set, and then the seal 20 is punctured by the puncture mechanism 40, eliminating the risk of bacterial infection of the liquid in the syringe 10. The limiting mechanism 50 can prevent liquid leakage when the piston pushes the mechanism 30 in the direction of the nipple 11 of the syringe 10 due to human misoperation when the injection is not used. When an injection is needed, the limiting function of the limiting mechanism 50 is released, and the piston pushing mechanism 30 can move along the syringe 10 to complete the liquid push injection.

[0035] For example, the piston pushing mechanism 30 includes a piston 31 and a push rod 32 that are fixedly connected to each other. The piston 31 is disposed in the syringe 10 and moves forward and backward following the push rod 32. The push rod 32 is hollow and the puncture mechanism 40 is disposed in the push rod 32. For example, please refer to Figure 6The puncture mechanism 40 includes a handle 41 and a puncture piece 42 with a sharp head. The puncture piece 42 is arranged in the piston pushing mechanism 30 and the head of the puncture piece 42 passes through the piston pushing mechanism 30. The puncture piece 42 is sealed and connected to the piston 31. The tail of the puncture piece 42 is fixedly connected to the handle 41. Hold the handle 41 by hand and move it toward the nipple 11 to drive the puncture piece 42 to pierce the sealing member 20. The puncture piece 42 can be a long needle or a long needle connected to a sharp triangular head. The sealing member 20 can be a sealing film. Preferably, the handle 41 is arranged on the side of the piston pushing mechanism 30. The piston pushing mechanism 30 is provided with a sliding groove 321 for cooperating with the sliding of the handle 41 along the movement direction of the puncture mechanism 40. Specifically, the sliding groove 321 is provided on the side wall of the push rod 32. Preferably, a limiting groove 322 is provided at the end of the sliding groove 321. When the prefilled syringe is in the storage state, the handle 41 is rotated to be embedded in the limiting groove 322 to limit the puncture member 42. When the injection is needed, the handle 41 is rotated to make the handle 41 leave the limiting groove 322 and move along the sliding groove 321 toward the nipple 11. After the puncture is completed, the handle 41 can be held and moved toward the tail of the syringe 10 to make the puncture member 42 leave the nipple 11, and finally the handle 41 is embedded in the sliding groove 321 for limiting.

[0036] In order to prevent the piercing member 42 from moving too far downward, the portion of the head of the piercing member 42 that passes through the nipple 11 is too long, thereby causing the infusion tube of the infusion set connected to the nipple 11 to be punctured, a positioning block 43 is provided at an appropriate position on the piercing member 42. The positioning block 43 is provided at the end of the piercing member 42 near the nipple 11, and the cross section of the positioning block 43 is larger than the cross section of the nipple 11. According to the actual product, the position of the positioning block 43 is properly set to limit the length of the piercing member 42 extending out of the nipple 11, thereby preventing the infusion tube from being punctured.

[0037] For example, please further combine Figure 5The limiting mechanism 50 includes a base 51 and a limiting block 52. The limiting block 52 is arranged on the base 51, and the limiting block 52 is detachably connected to the base 51. The base 51 is arranged at the nozzle of the syringe 10. Preferably, the base 51 and the syringe 10 are tightly matched to prevent the base 51 from being separated from the syringe 10. The base 51 and the syringe 10 can also be integrally formed. The limiting block 52 is provided with a positioning convex point 521, and the piston pushing mechanism 30 is provided with a positioning hole 323 matching the positioning convex point 521. The piston pushing mechanism 30 passes through the base 51, and the limiting block 52 is detachably connected to the piston pushing mechanism 30 through the positioning convex point 521 and the positioning hole 323. Exemplarily, the positioning hole 323 is provided on the push rod 32 of the piston pushing mechanism 30. In order to better cooperate with the measurement of the pre-injected liquid, the positioning holes 323 are at least two and arranged along the axial direction of the syringe 10. After pre-injection of different volumes of liquid, the positioning protrusions 521 on the limit block 52 can be adapted to the positioning holes 323 at appropriate positions, making the operation more convenient. Preferably, the base 51 is provided with a positioning rod 511, and the limit block 52 is provided with a positioning groove 522, and the positioning rod 511 and the positioning groove 522 are engaged to further prevent the limit block 52 from being separated from the base 51.

[0038] Preferably, the piston pushing mechanism 30 also includes an elastic member 33, the elastic member 33 is sleeved on the push rod 32 and the two ends of the elastic member 33 are respectively abutted on the piston 31 and the limiting mechanism 50. The elastic member 33 can be a spring. When the liquid has not yet been injected into the syringe 10, the elastic member 33 is in a natural state. Through a certain pressure, the liquid is injected into the syringe 10, the piston 31 moves toward the tail of the syringe 10, and the elastic member 33 is deformed to generate elastic force. Therefore, when using the injection, after the seal 20 is punctured, the limiting block 52 is pulled out, and under the elastic force of the elastic member 33, the push rod 32 is pushed to move toward the nipple 11, and the liquid is automatically pushed into the infusion set, which is faster to operate and saves manpower.

[0039] The working process of the utility model is described with preferred embodiments:

[0040] Liquid pre-injection stage: release the limit block 52, place the handle 41 of the puncture mechanism 40 in the limit groove 322, apply a certain pressure, and inject liquid from the nipple 11. The piston 31 and the push rod 32 move toward the tail of the syringe 10, and the elastic member 33 abuts between the base 51 and the piston 31 and is gradually compressed. When the liquid injection is completed, the limit block 52 is inserted, and the positioning protrusion 521 is embedded in the corresponding positioning hole 323 to limit the push rod 32 and prevent it from displacement.

[0041] Injector use stage: first connect the nipple 11 of the syringe 10 to the infusion set, then move the handle 41 to disengage the limit groove 322, and then drive the piercing member 42 to move along the sliding groove 321 toward the nipple 11, pierce the sealing member 20, return along the original path, and then insert the handle 41 into the limit groove 322. Finally, pull out the limit block 52, and under the elastic force of the elastic member 33, push the piston 31 to move toward the nipple 11, and automatically inject the liquid in the syringe 10 into the infusion set.

[0042] Embodiment 2

[0043] The technical feature that distinguishes this embodiment from the first embodiment is that another implementation of the puncture mechanism 40 is provided.

[0044] See also Figures 7 to 11 , the handle 41 is arranged at the rear of the piston pushing mechanism 30. A limiting opening 34 is arranged at the bottom of the piston pushing mechanism 30, that is, a limiting opening 34 is arranged on the bottom surface of the push rod 32. The handle 41 includes a bottom plate 411 and a limiting plate 412, the cross section of the limiting plate 412 is the same as the shape of the limiting opening 34 and the area of ​​the cross section is smaller than the area of ​​the limiting opening 34. Exemplarily, the handle 41 is a T-shaped handle 41, and the limiting opening 34 is a straight opening. Rotate the handle 41 to match the limiting plate 412 and the limiting opening 34 with each other, release the limit, and the limiting plate 412 can pass through the limiting opening 34. Hold the bottom plate 411 of the handle 41 by hand and push the piercing member 42 to move toward the nipple 11 of the syringe 10. After the piercing member 42 pierces the sealing member 20, it is restricted by the positioning block 43 and cannot move forward.

[0045] The advantages of this embodiment are: the position of the handle 41 in the puncture mechanism 40 is improved, and there is no need to set the sliding groove 321 and the limiting groove 322 on the push rod 32 of the piston pushing mechanism 30. It is only necessary to set the limiting opening 34 on the bottom surface of the push rod 31, and cooperate with the limiting plate 412 on the handle 41 to achieve the limiting and releasing of the puncture member 42. Not only is the structure simpler, but the operation is also more convenient.

[0046] In summary, the prefilled portable syringes of the above two embodiments both realize the release of the seal after the injection and the infusion set are fully connected through the puncture mechanism 40 in the piston pushing mechanism, ensuring that the outside air and bacteria will never enter the liquid in the needle tube, making the injection safer to use. At the same time, the utility model also provides an elastic member 33 in the piston pushing mechanism 30 to realize the automatic push injection of the liquid, which is convenient and fast to operate, saving manpower and time. The prefilled portable syringe of the utility model also has the advantages of simple structure and low cost, and is extremely suitable for promotion as a disposable medical device.

[0047] The above description is only a specific implementation method of the utility model, and does not limit the patent scope of the utility model. Any equivalent structural transformation made using the contents of the utility model specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the utility model.

Claims

1. A prefilled portable syringe, characterized in that: It includes a syringe, a sealing member, a piston pushing mechanism, a puncture mechanism for puncturing the sealing member, and a limiting mechanism for limiting the piston pushing mechanism. The sealing member is arranged on the nipple of the syringe, the piston pushing mechanism is partially arranged in the syringe, the limiting mechanism is arranged at the pipe mouth of the syringe and is detachably connected to the piston pushing mechanism, the puncture mechanism is arranged in the piston pushing mechanism and the nipple-proximal end of the puncture mechanism passes through the piston pushing mechanism, and the puncture mechanism moves along the axial direction of the syringe.

2. A prefilled portable syringe according to claim 1, characterized in that: The puncture mechanism includes a handle and a puncture piece with a sharp head. The puncture piece is arranged in the piston pushing mechanism and the head of the puncture piece passes through the piston pushing mechanism. The puncture piece is sealed and connected to the piston. The tail of the puncture piece is fixedly connected to the handle. The handle is arranged outside the piston pushing mechanism, and the handle drives the puncture piece to move axially along the syringe.

3. A prefilled portable syringe according to claim 2, characterized in that: The handle is arranged on the side of the piston pushing mechanism, and the piston pushing mechanism is provided with a sliding groove for cooperating with the sliding of the handle, and the end of the sliding groove is provided with a limiting groove for fixing the handle.

4. A prefilled portable syringe according to claim 2, characterized in that: The handle is arranged at the rear of the piston pushing mechanism, a limiting opening is arranged at the bottom of the piston pushing mechanism, the handle comprises a bottom plate and a limiting plate, the cross section of the limiting plate is the same shape as the limiting opening and the area of ​​the cross section is smaller than the area of ​​the limiting opening.

5. A prefilled portable syringe according to claim 2, characterized in that: A positioning block is provided at the nipple-proximal end of the puncture member, and the cross section of the positioning block is larger than the cross section of the nipple.

6. A prefilled portable syringe according to claim 2, characterized in that: The puncture member is a needle.

7. A prefilled portable syringe according to claim 2, characterized in that: The piston pushing mechanism comprises a piston and a push rod which are fixedly connected to each other. The piston is arranged in the syringe. The push rod is hollow and the puncture mechanism is arranged in the push rod.

8. A prefilled portable syringe according to claim 7, characterized in that: The piston pushing mechanism further comprises an elastic member, which is sleeved on the push rod and has two ends which abut against the piston and the limiting mechanism respectively.

9. A prefilled portable syringe according to claim 1, characterized in that: The limiting mechanism includes a base and a limiting block, wherein the limiting block is arranged on the base, and the base is arranged at the tube mouth of the syringe. The limiting block is provided with a positioning protrusion, and the piston pushing mechanism is provided with a positioning hole matching the positioning protrusion. The piston pushing mechanism passes through the base, and the limiting block is detachably connected to the piston pushing mechanism through the positioning protrusion and the positioning hole. The number of the positioning holes is at least two and the positioning holes are arranged along the axial direction of the syringe.

10. A prefilled portable syringe according to claim 9, characterized in that: The base is provided with a positioning rod, the limit block is provided with a positioning groove, and the positioning rod is engaged with the positioning groove.

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