Injector capable of accurately taking liquid

Abstract

The utility model discloses a syringe capable of taking liquid accurately, which comprises an empty cylinder, a needle head and a piston component, the needle head is detachably mounted at one end of the empty cylinder, the piston component is movably inserted into the empty cylinder and comprises a piston shaft, a piston and a piston handle, and the piston and the piston handle are respectively mounted at two ends of the piston shaft. The piston is movably sleeved with the empty cylinder, a core hole is formed in the piston shaft in the length direction and penetrates through the piston, and an air blocking needle is movably installed in the core hole. The utility model is suitable for the syringe, no air exists in the syringe before the syringe sucks liquid medicine, so that the problem that the liquid medicine is polluted does not exist, meanwhile, as no air exists in the syringe, when the liquid medicine is extracted, the amount of the liquid medicine can be controlled more accurately, and the situation of excessive extraction or insufficient extraction does not occur; and the injection exhaust action does not need to be performed before injection, so that the injection efficiency is improved, the situation of liquid medicine pollution can be reduced, and the situation of liquid medicine waste during exhaust cannot be caused.

Description

Technical Field

[0001] The utility model relates to the technical field of syringes, and particularly relates to a syringe for accurately extracting liquid. Background Art

[0002] A syringe is an instrument for injecting liquid medicine and is a common medical tool. The syringe consists of two parts: a barrel and a piston. The front end of the barrel has a "nipple" for connecting a needle, and the barrel wall has scales marking the liquid volume. There are various syringes with volumes of 1ml, 2ml, 5ml, 10ml, 20ml, 30ml, 50ml, 100ml, etc., which are mainly used for injecting liquid medicine or extracting liquid.

[0003] In existing syringes, due to different specifications of the empty syringes, sometimes when sucking medicine, it is not necessarily to extract a whole syringe, but half or a small amount may be needed. At this time, it is necessary to extract according to the required amount and exhaust air to ensure the dosage. During the exhaust process, there is a risk of liquid medicine overflowing and being contaminated, and even the dosage may not be accurate. Content of the Utility Model

[0004] The purpose of the utility model is to overcome the defects in the prior art that due to different specifications of the empty syringes, sometimes when sucking medicine, it is not necessarily to extract a whole syringe, but half or a small amount may be needed. At this time, it is necessary to extract according to the required amount and exhaust air to ensure the dosage. During the exhaust process, there is a risk of liquid medicine overflowing and being contaminated, and even the dosage may not be accurate. The utility model provides a syringe for accurately extracting liquid. Before sucking the liquid medicine, there is no air in the syringe, so there is no problem of liquid medicine being contaminated. At the same time, because there is no air in the syringe, when extracting the liquid medicine, the amount of the liquid medicine can be controlled more accurately, and there will be no situation of over-extracting or under-extracting. And before injection, there is no need to perform the injection exhaust operation, which improves the injection efficiency, can also reduce the situation of liquid medicine contamination, and will not cause waste of liquid medicine during exhaust.

[0005] To achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0006] The utility model discloses a syringe for accurately extracting liquid, which includes a barrel, a needle and a piston assembly. The needle is detachably installed at one end of the barrel, and the piston assembly is movably inserted into the barrel. The piston assembly consists of a piston shaft, a piston and a piston handle. Among them, the piston and the piston handle are respectively installed at both ends of the piston shaft, and the piston is movably sleeved in the barrel.

[0007] A core hole is provided inside the piston shaft along the length direction, and the core hole penetrates the piston. An air blocking needle is movably installed in the core hole. Among them, the air blocking needle has two states under the action of external constraints. The first state is that the bottom of the air blocking needle extends from the piston into the needle tip; the second state is that the bottom of the air blocking needle moves upward and is completely retracted into the core hole. The air blocking needle can change from the first state to the second state under external constraints. When the syringe is in use before, that is, the piston is at the bottom position of the barrel, at this time the air blocking needle is in the first state, and the bottom of the air blocking needle extends from the piston into the needle tip, so that the air in the barrel and the needle tip is completely exhausted. When the needle is inserted into the liquid medicine in the first state, and then the air blocking needle is controlled to change from the first state to the second state, so that it shrinks into the core hole. At this time, the needle is unblocked, and the liquid medicine can be extracted by pulling the piston handle. Such a structural setting makes it so that there is no air in the syringe before sucking the liquid medicine, so there is no problem of the liquid medicine being contaminated. At the same time, because there is no air in the syringe, when extracting the liquid medicine, the amount of the liquid medicine can be controlled more accurately, and there will be no situation of over-extracting or under-extracting. And there is no need to perform an injection exhaust operation before injection, which improves the injection efficiency, can also reduce the situation of liquid medicine contamination, and will not cause waste of liquid medicine during exhaust.

[0008] Preferably, an empty opening is provided at the top position of the piston shaft along the length direction, the top of the air blocking needle extends into the empty opening, and a sliding member is slidably installed in the empty opening. The top of the air blocking needle is connected to the sliding member. Such a structural setting makes it so that when the sliding member slides up and down, the air blocking needle can move up and down synchronously, so that it can be switched between the first state and the second state.

[0009] Preferably, the length of the empty opening is L, and when the air blocking needle is in the first state, the length of the bottom of the air blocking needle extending outside the piston is D, then L≥D. Such a structural setting is to ensure that when the sliding member moves upward, the bottom of the air blocking needle can be completely retracted into the core hole.

[0010] Preferably, both sides of the sliding member have outwardly protruding hand rods, and the front ends of the hand rods are of spherical structures. Such a structural setting makes it so that when the syringe is actually in use, that is, when the needle is inserted into the liquid medicine, medical staff can directly hook the spherical structures at both ends of the hand rods with the index finger and the middle finger and pull backward, which can drive the sliding member to move backward to realize the control of the air blocking needle.

[0011] Preferably, the inner wall of the core hole is made of an elastic silicone structure, so it can provide a certain clamping friction force to the air blocking needle, and this friction force can ensure that the air blocking needle will not shake up and down and maintain the air blocking effect.

[0012] Preferably, an auxiliary spring is further provided inside the hollow opening. Both ends of the auxiliary spring are connected to the sliding member and the piston handle through spring fixing columns. The auxiliary spring can provide a certain pulling assistance force to the sliding member, making it easier for medical staff to pull the sliding member.

[0013] Preferably, at least three wing plates are provided on the outer wall of the piston shaft. The three wing plates are distributed in an annular array, ensuring that the piston shaft does not shake during pushing and pulling.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] Before sucking the liquid medicine, there is no air in the syringe, so there is no problem of liquid medicine being contaminated. At the same time, because there is no air in the syringe, when extracting the liquid medicine, the amount of liquid medicine can be controlled more accurately, and there will be no situation of overextracting or underextracting. And before injection, there is no need to perform the injection exhaust operation, which improves the injection efficiency, can also reduce the situation of liquid medicine contamination, and will not cause waste of liquid medicine during exhaust. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 is a schematic diagram of the piston assembly structure of the utility model;

[0018] Figure 3 is a schematic diagram of a partial cross-sectional structure of the piston assembly of the utility model;

[0019] Figure 4 is a schematic diagram of a partial sectional structure of the piston assembly of the utility model;

[0020] Figure 5 is of the utility model Figure 4 magnified schematic diagram of the structure of area A.

[0021] Reference numerals: 1, barrel; 2, needle; 3, piston assembly; 301, piston handle; 302, piston shaft; 3021, hollow opening; 3022, auxiliary spring; 3023, core hole; 3024, hand rod; 3025, sliding member; 3026, spring fixing column; 303, wing plate; 304, piston; 305, air blocking needle. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The following combines the attached Figures 1-5, further illustrate the specific implementation of a syringe for precise liquid extraction of the present utility model, which overcomes the defects in the prior art that due to different specifications of syringes, sometimes when aspirating drugs, it is not necessarily a complete syringe that is aspirated, but half or a small amount needs to be aspirated. At this time, it is necessary to aspirate and exhaust air according to the required amount to ensure the dosage. During the exhaust process, there is a risk of liquid medicine overflow and pollution, and even the dosage is not accurate. Before aspirating the liquid medicine, there is no air in the syringe, so there is no problem of liquid medicine being contaminated. At the same time, because there is no air in the syringe, when aspirating the liquid medicine, the amount of liquid medicine can be controlled more accurately, and there will be no situation of over-aspirating or under-aspirating. And before injection, there is no need to perform the injection exhaust operation, which improves the injection efficiency, can also reduce the situation of liquid medicine pollution, and will not cause waste of liquid medicine during exhaust. The syringe for precise liquid extraction of the present utility model is not limited to the description of the following embodiments.

[0023] Embodiment 1:

[0024] This embodiment provides a syringe for precise liquid extraction, as Figures 1-5 shown, including a barrel 1, a needle 2 and a piston assembly 3. The needle 2 is detachably installed at one end of the barrel 1, and the piston assembly 3 is movably inserted into the barrel 1. The piston assembly 3 includes a piston shaft 302, a piston 304 and a piston handle 301. Among them, the piston 304 and the piston handle 301 are respectively installed at both ends of the piston shaft 302. The piston 304 is movably sleeved in the barrel 1. A core hole 3023 is opened along the length direction inside the piston shaft 302. The core hole 3023 penetrates the piston 304, and an air blocking needle 305 is movably installed in the core hole 3023. Among them, the air blocking needle 305 has two states under the external constraint. The first state is that the bottom of the air blocking needle 305 extends from the piston 304 into the needle 2; the second state is that the bottom of the air blocking needle 305 moves upward and is completely received into the core hole 3023. The air blocking needle 305 can be changed from the first state to the second state under the external constraint.

[0025] By adopting the above technical solution:

[0026] Before the syringe is used, that is, when the piston 304 is at the bottom position of the barrel 1, the air blocking needle 305 is in the first state. The bottom of the air blocking needle 305 extends from the piston 304 into the needle 2, completely exhausting the air in the barrel 1 and the needle 2. Insert the needle 2 into the liquid medicine in the first state, and then control the air blocking needle 305 to change from the first state to the second state, so that it shrinks into the core hole 3023. At this time, the needle 2 is penetrated, and the liquid medicine can be extracted by pulling the piston handle 301. Such a structural setting makes it so that there is no air in the syringe before sucking the liquid medicine, so there is no problem of the liquid medicine being contaminated. At the same time, because there is no air in the syringe, when extracting the liquid medicine, the amount of the liquid medicine can be controlled more accurately, and there will be no situation of over-extracting or under-extracting. And before injection, there is no need to perform an injection exhaust operation, which improves the injection efficiency, can also reduce the situation of liquid medicine contamination, and will not cause waste of liquid medicine during exhaust.

[0027] Embodiment 2

[0028] On the basis of Embodiment 1, in this embodiment, an empty opening 3021 is provided along the length direction at the top position of the piston shaft 302. The top of the air blocking needle 305 extends into the empty opening 3021. A sliding member 3025 is slidably installed in the empty opening 3021. The top of the air blocking needle 305 is connected to the sliding member 3025. Such a structural setting makes it so that when the sliding member 3025 slides up and down, the air blocking needle 305 can move up and down synchronously, so that it can be switched between the first state and the second state.

[0029] Specifically, the length of the empty opening 3021 is L. When the air blocking needle 305 is in the first state, the length of the bottom of the air blocking needle 305 extending outside the piston 304 is D, then L≥D. Such a structural setting is to ensure that when the sliding member 3025 moves upward, the bottom of the air blocking needle 305 can be completely received into the core hole 3023.

[0030] Specifically, both sides of the sliding member 3025 have outwardly protruding hand rods 3024. The front ends of the hand rods 3024 adopt a spherical structure. Such a structural setting makes it so that when the syringe is actually used, that is, when the needle 2 is inserted into the liquid medicine, medical staff can directly hook the spherical structures at both ends of the hand rods 3024 with the index finger and middle finger and pull backward to drive the sliding member 3025 to move backward to control the air blocking needle 305.

[0031] Specifically, the inner wall of the core hole 3023 adopts an elastic silicone structure, so it can provide a certain clamping friction force to the air blocking needle 305. This friction force can ensure that the air blocking needle 305 does not shake up and down and maintains the air blocking effect.

[0032] Specifically, an auxiliary spring 3022 is further provided inside the air interface 3021. Both ends of the auxiliary spring 3022 are connected to the sliding member 3025 and the piston handle 301 through spring fixing columns 3026. The auxiliary spring 3022 can provide a certain pulling auxiliary force to the sliding member 3025, making it easier for medical staff to pull the sliding member 3025.

[0033] It should be noted that the pulling force of the auxiliary spring 3022 is less than the clamping force of the core hole 3023 on the air blocking needle 305.

[0034] Specifically, at least three wing plates 303 are provided on the outer wall of the piston shaft 302. The three wing plates 303 are distributed in an annular array, ensuring that the piston shaft 302 does not shake during pushing and pulling through the wing plates 303.

[0035] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A syringe for accurately taking liquid, comprising an empty barrel (1), a needle (2) and a piston assembly (3), wherein the needle (2) is detachably mounted on one end of the empty barrel (1), and the piston assembly (3) is movably inserted into the empty barrel (1), characterized in that: The piston assembly (3) comprises a piston shaft (302), a piston (304) and a piston handle (301), wherein the piston (304) and the piston handle (301) are respectively mounted on two ends of the piston shaft (302), and the piston (304) is movably sleeved in the hollow cylinder (1); A core hole (3023) is provided inside the piston shaft (302) along the length direction, and the core hole (3023) passes through the piston (304). An air blocking needle (305) is movably installed in the core hole (3023), wherein the air blocking needle (305) has two states under the action of external constraints, wherein the first state is that the bottom of the air blocking needle (305) extends from the piston (304) to the needle head (2); and the second state is that the bottom of the air blocking needle (305) moves upward and is completely received in the core hole (3023), and the air blocking needle (305) can be transformed from the first state to the second state under the external constraint.

2. The syringe for precise liquid extraction according to claim 1, characterized in that: An opening (3021) is provided at the top of the piston shaft (302) along the length direction, and the top of the air blocking needle (305) extends into the opening (3021). A sliding member (3025) is slidably installed in the opening (3021), and the top of the air blocking needle (305) is connected to the sliding member (3025).

3. The syringe for accurate liquid collection according to claim 2, characterized in that: The length of the empty port (3021) is L, and when the air blocking needle (305) is in the first state, the length of the bottom of the air blocking needle (305) extending outside the piston (304) is D, and L≥D.

4. The syringe for accurate liquid collection according to claim 3, characterized in that: The two sides of the sliding member (3025) are provided with outwardly protruding hand rods (3024), and the front end of the hand rods (3024) adopts a spherical structure.

5. A syringe for precise liquid collection according to any one of claims 1 to 4, characterized in that: The inner wall of the core hole (3023) is made of an elastic silicone structure.

6. The syringe for accurate liquid collection according to claim 4, characterized in that: An auxiliary spring (3022) is also provided inside the hollow opening (3021), and both ends of the auxiliary spring (3022) are connected to the sliding member (3025) and the piston handle (301) via spring fixing columns (3026).

7. The syringe for accurate liquid collection according to claim 1, characterized in that: The outer wall of the piston shaft (302) is provided with at least three wing plates (303), and the three wing plates (303) are distributed in a ring array.

Images