CN210056796U - Pre-charging type pressure balance injector - Google Patents
Pre-charging type pressure balance injector Download PDFInfo
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- CN210056796U CN210056796U CN201822014253.0U CN201822014253U CN210056796U CN 210056796 U CN210056796 U CN 210056796U CN 201822014253 U CN201822014253 U CN 201822014253U CN 210056796 U CN210056796 U CN 210056796U
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- tube cavity
- syringe
- lower tube
- nipple
- piston
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Abstract
The utility model discloses a balanced syringe of pre-charge formula pressure belongs to the medical instrument field. The device comprises a nipple, a needle cylinder, a piston and a push rod, wherein the needle cylinder comprises an upper tube cavity at one end close to the nipple and a lower tube cavity at one end close to the push rod, the inner diameter of the upper tube cavity is larger than that of the lower tube cavity, a piston A is arranged in the lower tube cavity close to the intersection line of the upper tube cavity and the lower tube cavity, the inner diameters of the piston A and the lower tube cavity are the same, balance gas is filled in the upper tube cavity, and priming liquid is filled in. The utility model discloses an at cylinder front end pre-filling balance gas, resistance when can reducing suction negative pressure medicine bottle well liquid to reduce the possibility that repeated suction liquid medicine in-process produced liquid medicine pollution, utensil and pollute or some incident, and its structure setting accords with actual operation more, and it is more convenient, steady, safe to use.
Description
Technical Field
The utility model relates to a pre-filled syringe, concretely relates to pre-filled pressure balance syringe.
Background
A syringe is a common medical device primarily used in conjunction with a needle for drawing or injecting gas or liquid. At present, the injector has a plurality of defects in the using process, for example, in the dispensing process, when an operator repeatedly sucks liquid to dissolve the medicine, the possibility that the prepared medicine is polluted before injection is greatly increased due to the reasons of incomplete disinfection, improper sterile operation, incorrect ampoule breaking method and the like, and in addition, because a part of medicine powder bearing bottles have preloaded negative pressure, when an operator uses the injector to mix and suck the medicine, the operator is easily hindered by the pressure in the bottles. Moreover, the unreasonable structure of the existing injector is arranged, which easily causes the error of the operator in the using process. For example, the conventional syringe nipple and needle are installed by a friction force insertion and extraction manner, which is easy to fall off, and if the extracted liquid medicine is oily medicine, the syringe nipple and needle are more easily separated; in addition, the operator does not notice the relative position between the syringe piston and the syringe sleeve during the operation, so that the syringe piston and the syringe sleeve are easy to be dislocated.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving the above-mentioned problem among the prior art, provide a balanced syringe of pre-filling formula pressure, this syringe front end is filled with the ordinary pressure gas that is used for balancing the interior negative pressure of bottle, can reduce the resistance when sucking liquid medicine in the negative pressure medicine bottle, reduces the contaminated probability of liquid medicine simultaneously.
In order to realize the purpose of the utility model, the technical scheme of the utility model is as follows:
the utility model provides a pre-filled pressure balance syringe, includes nipple, cylinder, piston and push rod, its characterized in that: the needle cylinder comprises an upper tube cavity at one end close to the nipple and a lower tube cavity at one end close to the push rod, the inner diameter of the upper tube cavity is larger than that of the lower tube cavity, a piston A is arranged in the lower tube cavity close to the boundary line of the upper tube cavity and the lower tube cavity, the inner diameters of the piston A and the lower tube cavity are the same, balance gas is filled in the upper tube cavity, and priming liquid is filled in the lower tube cavity.
Furthermore, fixed ears are symmetrically arranged at two ends of the tail of the needle cylinder, and each fixed ear comprises an ear perpendicular to the needle cylinder and a stop block connected with the end part of the ear.
Further, the protrusion extends towards the side of the nipple, is in the same plane with the ear and forms an angle of 120 ° with the ear.
Further, the push rod is a solid cylinder, and the outer diameter of the push rod is 1/3 of the inner diameter of the lower tube cavity.
Furthermore, the nipple is equipped with the block that is used for the confined outward, establishes the external screw thread on the nipple, and the internal thread is established to the block, and the block is fixed through closing soon with the nipple.
Furthermore, a stop block is arranged on the inner wall of the lower pipe cavity close to the tail part 1/3, and the protruding length of the stop block is 2-3 mm.
Further, the air pressure in the upper tube cavity is consistent with the atmospheric pressure, and the balance gas filled in the upper tube cavity is sterile gas.
The utility model discloses a use method does: after the syringe is connected with the needle head, the needle head is inserted into the medicine bottle with negative pressure, balance gas in the syringe enters the negative pressure medicine bottle and the pressure in the medicine bottle, the blocking during the medicine liquid suction is prevented, meanwhile, under the pressure action of the balance gas, the piston A in the lower tube cavity moves to the upper tube cavity of the syringe, the pre-filling liquid also enters the medicine bottle in the process, if the internal and external air pressures of the bottle are balanced before the pre-filling liquid completely enters the medicine bottle, an operator can continuously press the pre-filling liquid into the medicine bottle as required.
The utility model has the advantages that:
1. the utility model discloses in, including nipple, cylinder, piston and push rod, the cylinder includes the last lumen of nearly nipple one end and the low tube chamber of nearly piston handle one end, goes up the lumen internal diameter and is greater than lower lumen internal diameter, and the boundary line department near upper and lower tube chamber in the low tube chamber is equipped with a piston A, piston A is the same with low tube intracavity internal diameter, and it has sterile gas to go up the tube intracavity packing, and the low tube intracavity packing has the priming solution. The front end of the injector is filled with normal pressure gas for balancing the negative pressure in the bottle, so that the resistance when the liquid medicine in the negative pressure medicine bottle is sucked can be reduced; the mode that the priming solution enters the medicine bottle is that the priming solution is pressed into the medicine bottle by air pressure difference without being pushed by external manpower, so that the operation steps of sucking the liquid medicine by an operator are simplified, the direct contact between the liquid medicine and people in the dispensing process is blocked, and the probability of pollution of the liquid medicine in the medicine bottle is reduced;
2. in the utility model, the stop block is arranged on the inner wall of the lower tube cavity close to the tail part 1/3, so that the situation that the piston is separated from the needle cylinder because the operator does not notice the relative position of the piston and the bottom of the needle cylinder in the operation process can be prevented;
3. in the utility model, the push rod is a solid cylinder, the outer diameter of the push rod is 1/3 of the inner diameter of the lower tube cavity, and enough space is left between the push rod and the inner wall of the lower tube cavity, so that the situation that the side wall inside the needle cylinder is polluted and the liquid medicine is polluted when an operator uses the injector not strictly according to the requirement, grasps the upper part of the piston handle and pushes the upper part of the piston handle into the needle cylinder again can be effectively prevented;
4. in the utility model, the two ends of the tail of the needle cylinder are symmetrically provided with the fixing lugs, and the fixing lugs comprise lugs which are perpendicular to the axis of the needle cylinder and lugs which are connected with the end parts of the lugs. The fixing ear can lead the syringe to be separated from the operator due to over-violent exertion when the operator places fingers; the bulge extends towards the side where the nipple is located, is in the same plane with the ear and forms an angle of 120 degrees with the ear, and meets the human mechanics;
5. the utility model discloses in, the syringe nipple is equipped with the block outward, and closes soon through the screw thread between block and the nipple and be connected, the block can prevent to collide the piston bottom because external environment leads to the piston to take place relative displacement and leads to the liquid in the syringe to receive the extrusion to lead to the liquid to expose, has also guaranteed the sterile condition on syringe top equally. After the cap is screwed off, the injector is matched with the needle head with the internal thread, so that the traditional plugging and unplugging mode can be changed, the connection between the needle head and the injector nipple is firmer, and the needle head is not easy to fall off.
Drawings
Fig. 1 is a schematic structural view of the present invention;
wherein the content of the first and second substances,
1. a nipple; 2. a needle cylinder; 200. an upper lumen; 201. a lower lumen; 3. a piston; 4. a push rod; 5. a piston A; 6. an ear; 7. a protrusion; 8. capping; 9. and a stop block.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "upper", "vertical", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship that the utility model is usually placed when using, or the orientation or positional relationship that a person skilled in the art usually understands, only for the convenience of describing the present invention and simplifying the description, but not for indicating or implying that the device or element that is referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," and "connected" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
This embodiment is the most basic embodiment.
A prefilled pressure balance injector is shown in figure 1, and comprises a nipple 1, a needle cylinder 2, a piston 3 and a push rod 4, wherein the needle cylinder 2 comprises an upper tube cavity 200 at one end close to the nipple 1 and a lower tube cavity 201 at one end close to the push rod 4, the inner diameter of the upper tube cavity 200 is larger than that of the lower tube cavity 201, a piston A5 is arranged in the lower tube cavity 201 and close to the boundary line of the upper tube cavity 201 and the lower tube cavity 201, the inner diameter of the piston A5 is the same as that of the lower tube cavity 201, balance gas is filled in the upper tube cavity 200, and prefilled liquid is filled in. The piston 3 and the push rod 4 are located in the lower cavity 201, and the priming liquid is stored in the gap between the piston 3 and the piston A5. The air pressure in the upper tube cavity 200 is consistent with the atmospheric pressure, and the balance gas filled in the upper tube cavity 200 is sterile gas.
The working principle of the prefilled pressure balance injector in the embodiment is as follows: after the syringe is connected with the needle head, the needle head is inserted into the medicine bottle with negative pressure, balance gas in the syringe enters the negative pressure medicine bottle and the pressure in the medicine bottle, the blocking during the medicine liquid suction is prevented, meanwhile, under the pressure action of the balance gas, the piston A5 in the lower tube cavity 201 moves to the upper tube cavity 200 of the syringe, the priming liquid also enters the medicine bottle in the process, if the priming liquid completely enters the medicine bottle, the internal and external air pressures are balanced, and an operator can continuously press the priming liquid into the medicine bottle as required to enter the medicine bottle.
The mode that the priming solution enters the medicine bottle is that the priming solution is pressed into the medicine bottle by air pressure difference without depending on external manual pushing, so that the operation steps of sucking the liquid medicine by an operator are simplified, the direct contact between the liquid medicine and a person in the medicine dispensing process is prevented, and the probability of pollution of the liquid medicine in the medicine bottle is reduced.
Example 2
This embodiment is a preferred embodiment.
A prefilled pressure balance injector comprises a nipple 1, a needle cylinder 2, a piston 3 and a push rod 4, wherein the needle cylinder 2 comprises an upper tube cavity 200 close to one end of the nipple 1 and a lower tube cavity 201 close to one end of the push rod 4, the inner diameter of the upper tube cavity 200 is larger than that of the lower tube cavity 201, a piston A5 is arranged in the lower tube cavity 201 close to the intersection line of the upper tube cavity 201 and the lower tube cavity 201, the inner diameters of the piston A5 and the lower tube cavity 201 are the same, balance gas is filled in the upper tube cavity 200, and prefilled liquid is filled in the lower tube cavity 201, preferably, the prefilled liquid can be 0.9% physiological saline, sterile water for injection. The piston 3 and the push rod 4 are located in the lower cavity 201, and the priming liquid is stored in the gap between the piston 3 and the piston A5. The tail two ends of the needle cylinder 2 are symmetrically provided with fixing lugs, each fixing lug comprises an ear 6 perpendicular to the needle cylinder 2 and a protrusion 7 connected with the end of the ear 6, the protrusion 7 extends towards the side of the nipple 1 and forms an angle of 120 degrees with the ear 6 on the same plane.
The fixing ear can prevent the operator from separating from the injector due to over-force when placing fingers because of the addition of the bulge 7.
Example 3
This embodiment is the best mode.
A prefilled pressure balance injector is shown in fig. 1, and comprises a nipple 1, a syringe 2, a piston 3 and a push rod 4, wherein the push rod 4 is connected with the piston 3, the push rod 4 and the piston 3 are arranged inside the syringe 2, the push rod 4 and the piston 3 can slide relative to the inner wall of the syringe 2, the syringe 2 comprises an upper tube cavity 200 at one end close to the nipple 1 and a lower tube cavity 201 at one end close to the push rod 4, the inner diameter of the upper tube cavity 200 is larger than that of the lower tube cavity 201, a piston A5 is arranged in the lower tube cavity 201 close to the boundary line between the upper tube cavity 201 and the lower tube cavity 201, the inner diameter of the piston A5 is the same as that of the lower tube cavity 201, balance gas is filled in the upper tube cavity 200, prefilled liquid is filled in the lower tube cavity 201, the piston 3 and the push rod 4 are located in the lower tube cavity 201.
Preferably, the two ends of the tail part of the needle cylinder 2 are symmetrically provided with fixing lugs, and the fixing lugs comprise lugs 6 perpendicular to the needle cylinder 2 and protrusions 7 connected with the end parts of the lugs 6.
Preferably, said protrusion 7 extends towards the side of the teat 1, in the same plane as the ear 6 and at an angle of 120 ° to the ear 6.
Preferably, the push rod 4 is a solid cylinder, and the outer diameter of the push rod is 1/3 of the inner diameter of the lower pipe cavity 201.
Preferably, the nipple 1 is equipped with the block 8 that is used for the confined outward, establishes the external screw thread on the nipple 1, and the internal thread is established to block 8, and block 8 is fixed through closing with the nipple 1 soon. The cap 8 seals the balance gas in the upper tube cavity 200, so that the balance gas and the sterile state of the front end of the injector are ensured, and the condition that the priming solution is exposed due to extrusion when the bottom of the piston 3 is impacted and has relative displacement is also prevented.
Preferably, a stop 9 is arranged on the inner wall of the lower cavity 201 close to the tail part 1/3, and the protruding length of the stop 9 is 2-3 mm. The stop blocks 9 are symmetrically arranged on the inner wall of the needle cylinder 2, have a limiting effect, and can prevent the situation that the piston 3 is separated from the needle cylinder 2 because the operator does not notice the relative position of the piston 3 and the bottom of the needle cylinder 2 in the process of operating the push rod 4.
Preferably, the pressure in the upper lumen 200 is the same as the atmospheric pressure, and the balance gas filled in the upper lumen 200 is a sterile gas, and the sterile gas is sterile air or sterile nitrogen.
The working principle of the pre-filled pressure balance injector is as follows: the cap 8 on the nipple 1 is screwed off, and the injector is matched with the needle head with the internal thread for use, so that the traditional plugging and unplugging mode can be changed, the connection between the needle head and the injector nipple 1 is firmer, and the needle head is not easy to fall off; when the syringe is connected with the needle head, after the needle head is inserted into the medicine bottle with negative pressure, the balance gas in the syringe enters the negative pressure medicine bottle and the pressure in the medicine bottle, so that the blockage in the process of sucking the medicine liquid is avoided, meanwhile, under the pressure action of the balance gas, the piston A5 in the lower tube cavity 201 moves to the upper tube cavity 200 of the syringe, the priming liquid also enters the medicine bottle in the process, if the internal and external air pressures of the priming liquid are balanced before the priming liquid completely enters the medicine bottle, an operator can continuously press the priming liquid into the medicine bottle as required.
The above is only the preferred embodiment of the present invention, not to the limitation of the present invention in any form, all the technical matters of the present invention all fall into the protection scope of the present invention to any simple modification and equivalent change of the above embodiments.
Claims (7)
1. The utility model provides a pre-filled pressure balance syringe, includes nipple (1), cylinder (2), piston (3) and push rod (4), its characterized in that: the needle cylinder (2) comprises an upper tube cavity (200) at one end close to the nipple (1) and a lower tube cavity (201) at one end close to the push rod (4), the inner diameter of the upper tube cavity (200) is larger than that of the lower tube cavity (201), a piston A (5) is arranged in the lower tube cavity (201) and is close to the intersection line of the upper tube cavity and the lower tube cavity (201), the inner diameters of the piston A (5) and the lower tube cavity (201) are the same, balance gas is filled in the upper tube cavity (200), and priming liquid is filled in the lower tube cavity (201).
2. A pre-filled pressure balanced syringe as claimed in claim 1, in which: the syringe (2) afterbody both ends symmetry are equipped with fixed ear, fixed ear include with syringe (2) perpendicular ear (6) and with ear (6) end connection's arch (7).
3. A pre-filled pressure balanced syringe according to claim 2, wherein: the bulge (7) extends towards the side of the nipple (1), is in the same plane with the ear (6) and forms an angle of 120 degrees with the ear (6).
4. A pre-filled pressure balanced syringe as claimed in claim 1, in which: the push rod (4) is a solid cylinder, and the outer diameter of the push rod is 1/3 of the inner diameter of the lower tube cavity (201).
5. A pre-filled pressure balanced syringe as claimed in claim 1, in which: the nipple is characterized in that a closed cover cap (8) is arranged outside the nipple (1), an external thread is arranged on the nipple (1), an internal thread is arranged on the cover cap (8), and the cover cap (8) is fixed with the nipple (1) in a screwing mode.
6. A pre-filled pressure balanced syringe as claimed in claim 1, in which: a stop block (9) is arranged on the inner wall of the lower tube cavity (201) close to the tail part 1/3, and the protruding length of the stop block (9) is 2-3 mm.
7. A pre-filled pressure balanced syringe as claimed in claim 1, in which: the air pressure in the upper tube cavity (200) is consistent with the atmospheric pressure, and the balance gas filled in the upper tube cavity (200) is sterile gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822014253.0U CN210056796U (en) | 2018-12-03 | 2018-12-03 | Pre-charging type pressure balance injector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822014253.0U CN210056796U (en) | 2018-12-03 | 2018-12-03 | Pre-charging type pressure balance injector |
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| Publication Number | Publication Date |
|---|---|
| CN210056796U true CN210056796U (en) | 2020-02-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822014253.0U Active CN210056796U (en) | 2018-12-03 | 2018-12-03 | Pre-charging type pressure balance injector |
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| Country | Link |
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| CN (1) | CN210056796U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109394537A (en) * | 2018-12-03 | 2019-03-01 | 四川大学华西第二医院 | A kind of pre-filled pressure equilibrium syringe |
| CN111588451A (en) * | 2020-06-01 | 2020-08-28 | 四川大学华西第二医院 | Push-injection pressurizing anti-suck-back double-cavity ovum taking needle with puncture protection device |
-
2018
- 2018-12-03 CN CN201822014253.0U patent/CN210056796U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109394537A (en) * | 2018-12-03 | 2019-03-01 | 四川大学华西第二医院 | A kind of pre-filled pressure equilibrium syringe |
| CN111588451A (en) * | 2020-06-01 | 2020-08-28 | 四川大学华西第二医院 | Push-injection pressurizing anti-suck-back double-cavity ovum taking needle with puncture protection device |
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