CN211751554U

CN211751554U - Drug delivery device

Info

Publication number: CN211751554U
Application number: CN201922017249.4U
Authority: CN
Inventors: 孙溢
Original assignee: Taizhou Start Medical Technology Co ltd
Current assignee: Jiangyin Electromechanical Technology Co.,Ltd.
Priority date: 2019-11-20
Filing date: 2019-11-20
Publication date: 2020-10-27
Anticipated expiration: 2029-11-20

Abstract

The utility model belongs to the technical field of the medical instrument technique and specifically relates to a medicine feeding device, including barrel, piston, head subassembly and the elastic element that has the piston chamber, elastic element makes the sealing member block up the airflow channel in gas energy storage chamber with piston butt on the head subassembly, and gas energy storage in the gas energy storage chamber is after its pressure overcomes elastic element's elasticity, forms piston percussion, the utility model discloses ingenious utilization elasticity makes piston energy storage to predetermined percussion pressure, so that the space of barrel axial upwards can be fully utilized by elastic element to realize that the piston obtains great percussion pressure with the barrel of less diameter, improve compact structure nature, be favorable to small and exquisite design; the elastic element can realize automatic reset of the piston after injection, and the use is convenient and quick; meanwhile, the rodless cavity exhausts cleanly, the sealing performance of the airflow channel is excellent and reliable, and the injection success rate and the accuracy are high.

Description

Drug delivery device

Technical Field

The utility model belongs to the technical field of the medical instrument technique and specifically relates to a device of dosing.

Background

With the development of science and technology, China becomes one of the few countries capable of producing needleless injectors worldwide, and the high-pressure jet principle is mainly utilized to enable liquid medicine to form a thin liquid flow to instantly penetrate through the skin to reach the subcutaneous part, so that the medicine has the advantages of uniform liquid medicine diffusion, quick response time, high medicine absorption rate, small wound and the like;

the conventional pen-type needleless injector generally uses magnetic force to make the injector reach a preset firing pressure, for example, a pneumatic magnetic force energy storage type needleless injector disclosed in chinese patent publication No. CN203861700U, the needleless injector just uses a magnet on a rear end cover to match with a magnetically attractable impact member, so that when the air pressure in an air flow channel reaches a certain value, a driving force acting on the impact member overcomes the magnetic force of the magnet on the impact member, the impact member is separated from the magnet to impact forward, thereby realizing injection of liquid medicine. Namely, the impact piece is locked by magnetic force, so that the impact piece is prevented from moving in advance when the pressure of an air source is not increased enough; the disadvantages of such needleless injectors are: when the required percussion pressure of injection target is great, the magnetic force that the magnet needs also must be great, leads to having to increase the volume of magnet, and then leads to the syringe volume to grow, is unfavorable for the small and exquisite design of syringe.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is: in order to solve the problem that the size of the needleless injector in the prior art is enlarged due to the enlargement of the volume of the magnet when the required percussion pressure is large because the magnetic force locking impact piece is adopted by the needleless injector, the administration device is provided, and the needleless injector is suitable for injecting liquid medicines of human bodies, livestock, pets and the like.

The utility model provides a technical scheme that its technical problem adopted is: a drug delivery device comprises a cylinder body with a piston cavity, a piston, a seal head assembly and an elastic element, wherein the piston is arranged in the piston cavity in a sliding mode, the seal head assembly and the elastic element are respectively arranged at two ends of the piston, a gas inlet, a gas energy storage cavity and a gas flow channel are formed in the seal head assembly and are communicated with each other, and the gas inlet is used for leading gas of a gas source to the gas energy storage cavity;

the piston cavity is provided with a rodless cavity at the position between the piston and the end enclosure assembly, a sealing element is arranged between the piston and the end enclosure assembly, the piston is abutted against the end enclosure assembly by the elastic element, so that the sealing element blocks an airflow channel of the gas energy storage cavity, when gas in the gas energy storage cavity is stored to the pressure thereof to overcome the elasticity of the elastic element, piston percussion is formed, and the airflow channel is communicated with the rodless cavity.

In the scheme, the elastic force is ingeniously utilized to enable the piston to store energy to the preset percussion pressure, so that the space in the axial direction of the cylinder body can be fully utilized by the elastic element, and the elastic element with larger elastic force can be installed on the basis of not increasing the outer diameter of the cylinder body, so that the piston can obtain larger percussion pressure by the cylinder body with smaller diameter, the structure compactness is improved, and the small and exquisite design is facilitated; wherein, the stability of percussion also can be improved relatively to the energy storage through elasticity, and elastic element can realize the automatic re-setting of piston after the injection, and convenient to use is swift.

Further, the head assembly comprises a head and an energy storage plug, the head is fixedly installed at the upper end of the cylinder, the energy storage plug is fixed on the head, and the gas energy storage cavity is formed between the energy storage plug and the head.

How to ensure that gas energy storage chamber lets in gaseous back, airflow channel can not take place to leak in advance, and the piston can be as far as the exhaust after reseing in the rodless chamber gas, and this is also the utility model discloses a key and difficult point also ensure the key that the injection can be accomplished smoothly, specific problem as follows: firstly, the air flow channel leaks air in advance when the gas energy storage cavity stores energy, so that the piston is injected at a firing pressure lower than a preset firing pressure, and liquid medicine cannot penetrate through the epidermis, so that the injection fails; gas in the rodless cavity cannot be exhausted after the piston is reset, and the gas which is not exhausted in the rodless cavity can counteract the elastic force of a part of elastic elements, so that the piston can inject at a pressure lower than the preset percussion pressure during the next injection, and the liquid medicine can not penetrate through the epidermis, so that the injection fails;

in view of the above, the following further technical solutions of the present invention are directed to solve the above problems, specifically as follows:

further, the air flow channel penetrates through the lower surface of the energy storage plug, the sealing element is fixed on the piston, and the lower surface of the energy storage plug is opposite to the sealing element; the sealing piece is directly attached to the lower surface of the energy storage plug to form surface sealing, so that the air flow channel is blocked.

Furthermore, a sealing bulge extends downwards from the lower surface of the energy storage plug, the air flow channel penetrates through the sealing bulge, and a one-way mechanism allowing air to enter the air energy storage cavity from the rodless cavity is arranged on the end enclosure assembly; thereby when the piston resets, sealed arch can support the sealing member in advance to with the air current passageway shutoff, because one-way mechanism's setting, along with the piston continues to draw close the restoration to the energy storage stopper, gas in the rodless chamber then can discharge to gaseous energy storage chamber through one-way mechanism, sealed arch supports the sealing member tightly to the indent, forms the end face seal and to a certain extent global sealed, and then realizes the gas clean-up in the rodless chamber, makes the air current passageway obtain excellent sealing performance simultaneously.

Furthermore, an air storage groove is formed in the lower surface of the energy storage plug, and the sealing protrusion is located in the air storage groove; or the upper surface of the piston is provided with an air storage groove.

Furthermore, the one-way mechanism comprises a one-way gasket and a one-way spring, the energy storage plug penetrates through the exhaust hole, one end of the one-way spring abuts against the end socket or the energy storage plug, the other end of the one-way spring abuts against the one-way gasket, and the one-way gasket abuts against the energy storage plug and is located at the position, located at the upper end of the exhaust hole, of the one-way gasket.

Furthermore, the peripheral surface of the sealing bulge is a conical surface with a large upper end and a small lower end.

Further, the upper surface of the piston is provided with an installation groove, and the sealing element is embedded into the installation groove.

Furthermore, an upper bulge extends upwards from the upper surface of the sealing element, a sealing groove matched with the upper bulge is formed in the lower end of the airflow channel, and the upper bulge is embedded into the sealing groove.

Furthermore, the elastic element adopts a spring, one end of the elastic element is abutted in the cylinder, the other end of the elastic element is abutted on the piston, and the elastic element is sleeved outside the piston rod of the piston.

Further, the sealing element is a rubber pad.

The utility model has the advantages that: the utility model discloses a device of dosing ingenious utilization elasticity makes the piston energy storage to predetermined percussion pressure to the space of barrel axial upwards can be by elastic element make full use of, realize can pack into the elastic element that elasticity is great on the basis that does not increase the barrel external diameter, thereby realize that the piston obtains great percussion pressure with the barrel of less diameter, improve compact structure, be favorable to small and exquisite design; the triggering stability can be improved by storing energy through elastic force, and the elastic element can realize automatic resetting of the piston after injection, so that the use is convenient and quick; meanwhile, the rodless cavity exhausts cleanly, the sealing performance of the airflow channel is excellent and reliable, and the injection success rate and the accuracy are high.

Drawings

The present invention will be further explained with reference to the drawings and examples.

FIG. 1 is a schematic cross-sectional view of a drug delivery device of the present invention;

FIG. 2 is an enlarged partial schematic view of A of FIG. 1;

FIG. 3 is a schematic view of a drug delivery device according to embodiment 3 of the present invention

Figure 4 is a schematic view of a drug delivery device according to example 1 of the present invention;

figure 5 is a schematic view of a drug delivery device according to example 4 of the present invention;

fig. 6 is an exploded view of the drug delivery device of the present invention.

In the figure: 1. the piston comprises a cylinder body, 1-1 parts, a piston cavity, 1-2 parts, a rodless cavity, 2 parts, a piston, 2-1 parts, a piston rod, 2-2 parts, a mounting groove, 3 parts, an elastic element, 4 parts, an air inlet, 5 parts, a gas energy storage cavity, 6 parts, an air flow channel, 7 parts, a sealing element, 7-1 parts, an upper bulge, 8 parts, a seal head, 9 parts, an energy storage plug, 9-1 parts, a sealing bulge, 9-2 parts, an exhaust hole, 9-3 parts, a sealing groove, 9-4 parts, an air storage groove, 10 parts, a one-way gasket, 11 parts, a one-way spring, 12 parts.

Detailed Description

The present invention will now be described in further detail with reference to the accompanying drawings. The drawings are simplified schematic drawings, which illustrate the basic structure of the invention only in a schematic way, and thus show only the components that are relevant to the invention, and the directions and references (e.g., upper, lower, left, right, etc.) may be used only to help describe the features in the drawings. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the claimed subject matter is defined only by the appended claims and equivalents thereof.

Example 1

As shown in fig. 1, 4 and 6, a drug delivery device comprises a cylinder 1 having a piston cavity 1-1, a piston 2, a head assembly and an elastic element 3, wherein the piston 2 is slidably disposed in the piston cavity 1-1, the head assembly and the elastic element 3 are respectively disposed at two ends of the piston 2, the head assembly has a gas inlet 4, a gas energy storage cavity 5 and a gas flow channel 6, which are communicated with each other, and the gas inlet 4 is used for introducing gas from a gas source into the gas energy storage cavity 5;

the part, positioned between the piston 2 and the end enclosure assembly, in the piston cavity 1-1 is a rodless cavity 1-2, a sealing element 7 is arranged between the piston 2 and the end enclosure assembly, the elastic element 3 abuts against the piston 2 on the end enclosure assembly, so that the sealing element 7 blocks an air flow channel 6 of the gas energy storage cavity 5, when the gas in the gas energy storage cavity 5 is stored until the pressure of the gas overcomes the elasticity of the elastic element 3, the piston 2 is formed to be fired, and the air flow channel 6 is communicated with the rodless cavity 1-2;

in this embodiment, the elastic element 3 may specifically adopt a spring, one end of the elastic element 3 abuts against the inside of the cylinder 1, the other end abuts against the piston 2, and the elastic element 3 is sleeved outside the piston rod 2-1 of the piston 2.

The end socket assembly comprises an end socket 8 and an energy storage plug 9, the end socket 8 is fixedly arranged at the upper end of the cylinder body 1, the energy storage plug 9 is fixed on the end socket 8, and the gas energy storage cavity 5 is formed between the energy storage plug 9 and the end socket 8; in the embodiment, the energy storage plug 9 can be fixed on the end enclosure 8 in a threaded connection mode, and an O-shaped sealing ring can be matched between the outer peripheral surface of the bottom end of the energy storage plug 9 and the end enclosure 8 for sealing; the end socket 8 can be fixed at the rear end of the cylinder 1 in a threaded connection mode, and an O-shaped sealing ring is arranged between the end socket 8 and the cylinder 1 for sealing.

As shown in fig. 4, the air flow channel 6 penetrates through the lower surface of the energy storage plug 9, the sealing member 7 is fixed on the piston 2, and the lower surface of the energy storage plug 9 is opposite to the sealing member 7; the sealing piece 7 is directly attached to the lower surface of the energy storage plug 9 to form surface sealing, so that the air flow channel 6 is blocked.

The upper surface of the piston 2 is provided with a mounting groove 2-2, the sealing element 7 is embedded into the mounting groove 2-2, specifically, the sealing element 7 is a rubber pad, and the sealing element 7 can be fixed in the mounting groove 2-2 of the piston 2 through connection modes such as clamping, bonding and the like, and in the embodiment, the sealing element 7 can be fixed on the piston 2 through any connection mode.

The working principle of the embodiment is as follows:

when in use, the medicine core 12 filled with the liquid medicine is connected to the front end of the cylinder 1, and the piston rod 2-1 on the piston 2 in the cylinder 1 is opposite to the push rod 12-1 in the medicine core 12; then communicating a gas source with a gas inlet 4 of a gas energy storage cavity 5, starting to introduce compressed gas into the gas energy storage cavity 5, overcoming the elasticity of a spring when the pressure of the gas in the gas energy storage cavity 5 rises to a preset percussion pressure, instantly flushing the gas in the gas energy storage cavity 5 into a rodless cavity 1-2 from a gas flow channel 6 so as to enable a piston 2 to be quickly struck forwards, pushing a push rod 12-1 through a piston rod 2-1 to eject liquid medicine in a medicine core 12 at a high speed by a thin liquid flow, instantly penetrating through the skin to reach the subcutaneous part, and finishing injection;

after the injection is finished, the air source is cut off, the piston 2 automatically resets under the action of the spring, and the sealing element 7 on the piston 2 is tightly pressed against the lower surface of the energy storage plug 9 again; the next injection can be carried out after the drug core 12 is replaced;

because the epidermis thicknesses of different injection targets are different, the required percussion pressure is different when vaccines are injected into different types of pets; therefore, it should be noted that in this embodiment, different firing pressures can be obtained by replacing different specifications of the spring, and the piston cavity 1-1 in the cylinder 1 also provides sufficient installation space for the spring.

In the embodiment, the energy storage plug 9 and the sealing member 7 are sealed in a plane contact manner, so that the energy storage plug can adapt to relatively small percussion pressure, however, when the percussion pressure is relatively high, the sealing performance between the energy storage plug 9 and the sealing member 7 of the sealing structure has disadvantages, gas in the gas energy storage cavity 5 is easy to leak from the gas flow channel 6 to the rodless cavity 1-2 in advance, so that the piston 2 can be injected at a pressure lower than the preset percussion pressure, and liquid medicine cannot penetrate through the skin easily.

Example 2

As shown in fig. 2, embodiment 2 differs from embodiment 1 in that: the lower surface of the energy storage plug 9 extends downwards to form a sealing bulge 9-1, the air flow channel 6 penetrates through the sealing bulge 9-1, and the end enclosure assembly is provided with a one-way mechanism allowing air to enter the air energy storage cavity 5 from the rodless cavity 1-2.

The peripheral surface of the sealing bulge 9-1 is a conical surface with a large upper end and a small lower end.

The one-way mechanism comprises a one-way gasket 10 and a one-way spring 11, an exhaust hole 9-2 penetrates through the energy storage plug 9, one end of the one-way spring 11 abuts against the end socket 8 or the energy storage plug 9, the other end of the one-way spring abuts against the one-way gasket 10, and the one-way gasket 10 abuts against the energy storage plug 9 and is positioned at the upper end of the exhaust hole 9-2; in this embodiment, the unidirectional gasket 10 may be a rubber gasket.

The working principle of the present embodiment is the same as that of embodiment 1, but there is a difference in the sealing structure between the piston 2 and the sealing member 7 to achieve that the piston 2 can perform accurate injection with a large predetermined firing pressure, which is specifically analyzed as follows:

when the piston 2 is reset, the sealing bulge 9-1 can abut against the sealing piece 7 in advance to seal the air flow channel 6, due to the arrangement of the one-way mechanism, the piston 2 can continuously approach the energy storage plug 9 for resetting, gas in the rodless cavity 1-2 can be discharged to the gas energy storage cavity 5 through the exhaust hole 9-2, and due to the fact that the contact area between the sealing piece 7 and the sealing bulge 9-1 is small, the sealing performance is more excellent, and accurate injection of the piston 2 can be carried out with larger preset firing pressure.

Example 3

As shown in fig. 3, embodiment 3 differs from embodiment 2 in that: the lower surface of the energy storage plug 9 is provided with an air storage groove 9-4, and the sealing bulge 9-1 is positioned in the air storage groove 9-4; or the upper surface of the piston 2 is provided with an air storage groove; the purpose is as follows: even if a small amount of air leakage exists between the sealing bulge 9-1 and the sealing piece 7, the leaked air can enter the air storage groove 9-4 due to the air storage groove 9-4, so that the influence on the pressure of the rodless cavity 1-2 before firing is smaller, and the firing pressure can be controlled more accurately.

Example 4

As shown in fig. 5, example 4 differs from examples 1 and 2 in that: an upper bulge 7-1 extends upwards from the upper surface of the sealing element 7, a sealing groove 9-3 matched with the upper bulge 7-1 is formed in the lower end of the airflow channel 6, the upper bulge 7-1 is embedded into the sealing groove 9-3, and specifically, the upper bulge 7-1 is of a conical structure with a small upper end and a large lower end.

The working principle of the present embodiment is the same as that of embodiment 1, but the sealing structure between the piston 2 and the sealing member 7 is different, so that the piston 2 can perform accurate injection with moderate preset firing pressure, and the specific analysis is as follows:

when the piston 2 is reset, the upper bulge 7-1 of the sealing element 7 can be embedded and clamped into the sealing groove 9-3 of the energy storage plug 9, and the sealing effect on the air flow channel 6 is relatively excellent.

In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims

1. A drug delivery device characterized by: the gas-liquid separator comprises a cylinder body (1) with a piston cavity (1-1), a piston (2), a seal head assembly and an elastic element (3), wherein the piston (2) is arranged in the piston cavity (1-1) in a sliding mode, the seal head assembly and the elastic element (3) are respectively arranged at two ends of the piston (2), the seal head assembly is internally provided with a gas inlet (4), a gas energy storage cavity (5) and a gas flow channel (6) which are communicated with each other, and the gas inlet (4) is used for leading gas of a gas source to the gas energy storage cavity (5);

the piston is characterized in that a part between the piston (2) and the end enclosure assembly in the piston cavity (1-1) is a rodless cavity (1-2), a sealing element (7) is arranged between the piston (2) and the end enclosure assembly, the elastic element (3) abuts against the piston (2) on the end enclosure assembly, so that the sealing element (7) blocks an air flow channel (6) of the gas energy storage cavity (5), when gas energy storage in the gas energy storage cavity (5) overcomes the elastic force of the elastic element (3) to the pressure thereof, the piston (2) is fired, and the air flow channel (6) is communicated with the rodless cavity (1-2).

2. The drug delivery device of claim 1, wherein: the seal head assembly comprises a seal head (8) and an energy storage plug (9), the seal head (8) is fixedly installed at the upper end of the cylinder body (1), the energy storage plug (9) is fixed on the seal head (8), and the gas energy storage cavity (5) is formed between the energy storage plug and the seal head (8).

3. The drug delivery device of claim 2, wherein: the air flow channel (6) penetrates through the lower surface of the energy storage plug (9), the sealing piece (7) is fixed on the piston (2), and the lower surface of the energy storage plug (9) is opposite to the sealing piece (7).

4. The drug delivery device of claim 3, wherein: the lower surface of the energy storage plug (9) extends downwards to form a sealing protrusion (9-1), the air flow channel (6) penetrates through the sealing protrusion (9-1), and a one-way mechanism allowing air to enter the air energy storage cavity (5) from the rodless cavity (1-2) is arranged on the end enclosure assembly.

5. The drug delivery device of claim 4, wherein: an air storage groove (9-4) is formed in the lower surface of the energy storage plug (9), and the sealing protrusion (9-1) is located in the air storage groove (9-4); or the upper surface of the piston (2) is provided with an air storage groove.

6. The drug delivery device of claim 4, wherein: the one-way mechanism comprises a one-way gasket (10) and a one-way spring (11), an exhaust hole (9-2) penetrates through the energy storage plug (9), one end of the one-way spring (11) abuts against the end socket (8) or the energy storage plug (9), the other end of the one-way spring abuts against the one-way gasket (10), and the one-way gasket (10) abuts against the position, located at the upper end of the exhaust hole (9-2), of the energy storage plug (9).

7. The drug delivery device of claim 4, wherein: the peripheral surface of the sealing bulge (9-1) is a conical surface with a large upper end and a small lower end.

8. The drug delivery device of claim 3, wherein: the upper surface of the piston (2) is provided with a mounting groove (2-2), and the sealing element (7) is embedded into the mounting groove (2-2).

9. The drug delivery device of claim 3, wherein: the upper surface of the sealing element (7) extends upwards to form an upper bulge (7-1), the lower end of the airflow channel (6) is provided with a sealing groove (9-3) matched with the upper bulge (7-1), and the upper bulge (7-1) is embedded into the sealing groove (9-3).

10. The drug delivery device of claim 1, wherein: the elastic element (3) is a spring, one end of the elastic element (3) is abutted to the inside of the cylinder body (1), the other end of the elastic element is abutted to the piston (2), and the elastic element (3) is sleeved outside a piston rod (2-1) of the piston (2).

11. The drug delivery device of claim 1, wherein: the sealing element (7) is a rubber pad.