CN213220055U - Drug delivery device stable in starting - Google Patents
Drug delivery device stable in starting Download PDFInfo
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- CN213220055U CN213220055U CN202020886764.6U CN202020886764U CN213220055U CN 213220055 U CN213220055 U CN 213220055U CN 202020886764 U CN202020886764 U CN 202020886764U CN 213220055 U CN213220055 U CN 213220055U
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Abstract
The utility model relates to the technical field of medical equipment, in particular to a drug delivery device with stable starting, which comprises a cylinder body with a piston cavity, a piston, a pressing mechanism and a head assembly, wherein a rodless cavity is formed between the head assembly and the piston, the head assembly is provided with an airflow channel, a gas core and an exhaust hole for communicating the outside with the rodless cavity, and the gas core is arranged to move towards the exhaust hole after overcoming the preset resistance of the gas core under the pressure of compressed gas in the rodless cavity and to block the exhaust hole; the utility model utilizes the arrangement of the gas core and the exhaust hole to directly exhaust the residual trace gas in the rodless cavity through the exhaust hole, thereby realizing that the piston can have relatively stable starting percussion pressure; and the required sealing points are reduced, even if a little air leakage exists between the piston and the air flow channel of the end socket assembly, the air can be discharged from the air discharge hole, and the normal firing of the piston is not influenced, so that the sealing difficulty between the piston and the end socket assembly is greatly reduced, and the failure rate is also reduced.
Description
Technical Field
The utility model belongs to the technical field of the medical instrument technique and specifically relates to a start stable 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;
for a pneumatic needleless injector, it is particularly important to ensure that the pneumatic needleless injector has a relatively constant starting pressure;
the existing pneumatic needleless injector is easy to have the problem of unstable starting and triggering pressure, and the medicine delivery device disclosed in Chinese patent document with the publication number of CN110841150A has the following defects:
firstly, the pressure of a gas energy storage cavity 5 is equal to that of a rodless cavity 1-2 during initial assembly, and a certain amount of gas can remain in the rodless cavity 1-2 after initial starting and triggering, so that the pressure in the rodless cavity 1-2 is slightly greater than that in the gas energy storage cavity 5, and the pressure of the secondary starting and triggering is reduced relative to that of the primary starting and triggering; however, after the rodless cavity 5 is placed for a period of time, the gas in the rodless cavity 5 gradually permeates out, so that the gas pressure in the rodless cavity 5 is close to the gas pressure during the first assembly, and the starting percussion pressure is increased relative to the pressure during the second starting percussion, thereby bringing great trouble to the actual use and being incapable of accurately controlling the starting pressure;
secondly, there are three places to be sealed, and the sealing point is many, specifically: the sealing position between the end socket 8 and the energy storage plug 9, the sealing position between the one-way gasket 10 and the exhaust hole 9-2 of the energy storage plug 9 and the sealing position between the energy storage plug 9 and the sealing element 7, and the starting locking failure can be caused by only one sealing position leaking, although the sealing failure is not frequent, the failure rate is increased undoubtedly after the three sealing positions are accumulated.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is: in order to solve the problems that the medicine feeding device in the prior art is unstable in starting triggering pressure and multiple in sealing points, the medicine feeding device stable in starting is provided.
The utility model provides a technical scheme that its technical problem adopted is: a drug delivery device with stable starting comprises a cylinder body with a piston cavity, a piston, a pressing mechanism and a head assembly, wherein the piston is arranged in the piston cavity in a sliding mode, a rodless cavity is formed between the head assembly and the piston, the head assembly is provided with an air flow channel, an air core and an exhaust hole for communicating the outside with the rodless cavity, the piston is abutted against the head assembly under the action of the pressing mechanism so as to seal an outlet of the air flow channel, piston percussion is formed after the pressure of air in the air flow channel is stored until the pressure of the air in the air flow channel overcomes the acting force of the pressing mechanism on the piston, the air flow channel is communicated with the rodless cavity, and the air core is arranged to move to the exhaust hole after overcoming the preset resistance of the air core under the pressure of compressed air in the rodless cavity and seal the exhaust; when the pressure of the gas in the rodless cavity to the gas core is smaller than the preset resistance, the gas core is far away from the exhaust hole, and the exhaust hole is opened.
According to the scheme, the arrangement of the gas core and the exhaust hole is utilized, so that residual trace gas in the rodless cavity can be directly exhausted through the exhaust hole, the pressure in the rodless cavity is always consistent with the atmospheric pressure, after the gas in the gas flow channel is stored to the set pressure, high-speed gas flow instantly rushes into the rodless cavity, the gas core is pushed to the exhaust hole to block the exhaust hole, and the piston is driven by the high-speed gas flow to complete starting and triggering, so that the piston can have relatively stable starting and triggering pressure; and the required sealing points are reduced, even if a little air leakage exists between the piston and the air flow channel of the end socket assembly, the air can be discharged from the air discharge hole, and the normal firing of the piston is not influenced, so that the sealing difficulty between the piston and the end socket assembly is greatly reduced, and the failure rate is also reduced.
The end socket assembly comprises an end socket, the end socket is fixed at the upper end of the cylinder body, the rodless cavity is formed between the end socket and the piston, a sliding hole is formed in the end socket, the gas core is inserted into the sliding hole, a gap is reserved between the gas core and the sliding hole, the rodless cavity is communicated with the exhaust hole through the gap, the exhaust hole is located at the outer end of the sliding hole, and the rodless cavity is located at the inner end of the sliding hole; the residual trace gas in the rodless cavity reaches the exhaust hole after passing through the gap between the gas core and the sliding hole and is directly exhausted from the exhaust hole.
Further, a magnetic force adsorption member is fixed at the inner end of the sliding hole and used for adsorbing the air core to the inner end of the sliding hole.
Further, the sliding hole has therein an exhaust spring for urging the air core toward an inner end of the sliding hole.
Further, the outer end of the sliding hole is provided with a sealing piece; therefore, the air core can better seal the exhaust hole when the piston starts to trigger.
Further, the inner end of the air core is provided with a conical part, the small end of the conical part is close to the rodless cavity, and the large end of the conical part is close to the exhaust hole; or the inner end of the gas core is provided with a thin section, and the outer diameter of the outer end of the gas core is larger than that of the thin section; or the inner end of the air core is provided with a magnetic isolation gasket. The suction force between the gas core and the magnet can be adjusted by the measures; wherein, set up the cone portion on the gas core or set up the thin section and be all through changing the area of contact between gas core and the magnet to realize the regulation of suction, if utilize the tip and the magnet contact of cone portion on the gas core, can reduce the adsorption affinity between its and the magnet.
Further, head threaded connection has the air cock, the inside of air cock has airflow channel, the flank has on the air cock, magnetic force adsorbs the piece and is fixed between flank and head by the centre gripping.
Furthermore, a sealing glue is arranged at the threaded connection position between the air tap and the end enclosure or a raw material tape is wound on the threaded connection position.
Furthermore, the cross sections of the gas core and the sliding hole are circular, the axis of the sliding hole is parallel to the axis of the rodless cavity, and the difference between the inner diameter of the sliding hole and the outer diameter of the gas core is 0.02-0.3 mm; the larger the magnetic force, the smaller the gap. Or the larger the force of the exhaust spring, the smaller the gap.
Furthermore, the pressing mechanism comprises an elastic element, the elastic element is arranged in the piston cavity, and the piston is pushed by the elasticity of the elastic element to abut against the end socket assembly; or the pressing mechanism comprises a magnetic element, the magnetic element is arranged in the end socket assembly, and the piston is propped against the end socket assembly under the magnetic force adsorption of the magnetic element.
The utility model has the advantages that: the drug delivery device with stable starting of the utility model utilizes the arrangement of the gas core and the exhaust hole to directly exhaust the residual trace gas in the rodless cavity through the exhaust hole, thereby realizing that the piston can have relatively stable starting percussion pressure; and the required sealing points are reduced, even if a little air leakage exists between the piston and the air flow channel of the end socket assembly, the air can be discharged from the air discharge hole, and the normal firing of the piston is not influenced, so that the sealing difficulty between the piston and the end socket assembly is greatly reduced, and the failure rate is also reduced.
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 start-stable 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 cross-sectional view of a stable start drug delivery device according to example 2 of the present invention.
In the figure: 1. the device comprises a cylinder body, 2, a piston cavity, 3, a piston, 3-1, a piston rod, 4, a rodless cavity, 5, an air nozzle, 5-1, an air flow channel, 5-2, a side wing, 6, a sealing head, 6-1, an exhaust hole, 6-2, a sliding hole, 6-3, a gap, 7, an air core, 7-1, a conical part, 8, a magnetic adsorption piece, 9, a sealing piece, 10, an exhaust spring, 11, an elastic element, 12, a joint, 13, a sealing gasket, 14, a push rod, 15 and a medicine core.
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 figures 1 and 2, a drug delivery device with stable start comprises a cylinder body 1 with a piston cavity 2, a piston 3, a pressing mechanism and a head assembly, wherein the piston 3 is arranged in the piston cavity 2 in a sliding manner, a rodless cavity 4 is formed between the head assembly and the piston 3, the head assembly is provided with an air flow channel 5-1, a gas core 7 and an exhaust hole 6-1 for communicating the outside with the rodless cavity 4, the piston 3 is propped against the head assembly under the action of the pressing mechanism so as to seal an outlet of the air flow channel 5-1, when the pressure of the air in the air flow channel 5-1 is accumulated to overcome the acting force of the pressing mechanism on the piston 3, the piston 3 is formed, the air flow channel 5-1 is triggered to be communicated with the rodless cavity 4, the gas core 7 is arranged to move towards the exhaust hole 6-1 after overcoming the preset resistance of the gas core 7 under the pressure of compressed gas in the rodless cavity 4, and plugging the same; when the pressure of the gas in the rodless cavity 4 on the gas core 7 is smaller than the preset resistance, the gas core 7 is far away from the exhaust hole 6-1, and the exhaust hole 6-1 is opened.
The end socket assembly comprises an end socket 6, the end socket 6 is fixed at the upper end of the cylinder body 1, the rodless cavity 4 is formed between the end socket 6 and the piston 3, a sliding hole 6-2 is formed in the end socket 6, the air core 7 is inserted into the sliding hole 6-2, a gap 6-3 is reserved between the air core 7 and the sliding hole 6-2, the rodless cavity 4 is communicated with the exhaust hole 6-1 through the gap 6-3, the exhaust hole 6-1 is positioned at the outer end of the sliding hole 6-2, and the rodless cavity 4 is positioned at the inner end of the sliding hole 6-2; the trace gas remained in the rodless cavity 4 reaches the exhaust hole 6-1 after passing through the gap 6-3 between the gas core 7 and the sliding hole 6-2, and is directly exhausted from the exhaust hole 6-1.
In the embodiment, the air core 7 is configured to move towards the exhaust hole 6-1 under the pressure of the air flow in the rodless cavity 4, wherein the preset resistance overcome when the air core 7 moves can be magnetic force or elastic force, the preset resistance in the embodiment is magnetic force, and the preset resistance is elastic force, which is described in embodiment 2;
when the preset resistance existing when the gas core 7 moves is adopted as the magnetic force: a magnetic adsorption piece 8 is fixed at the inner end of the sliding hole 6-2 and is used for adsorbing the gas core 7 to the inner end of the sliding hole 6-2, and the gas core 7 is fixed on the magnetic adsorption piece 8 through magnetic adsorption; specifically, there may be several embodiments, one of which is: the material of the gas core 7 is ferromagnetic material, the magnetic force adsorption piece 8 is a magnet, and the gas core 7 is adsorbed on the magnet through magnetic force; the second is as follows: the magnetic force adsorption piece 8 is made of ferromagnetic materials, a magnet is fixed on the gas core 7, and the magnet fixed on the gas core 7 is magnetically adsorbed on the magnetic force adsorption piece 8; the third is: the magnetic force adsorption piece 8 is a magnet, the gas core 7 is also fixed with a magnet, and the magnet on the gas core 7 and the gas core 7 are fixed on the magnetic force adsorption piece 8 through magnetic force adsorption.
The outer end of the sliding hole 6-2 is provided with a sealing member 9; here, the sealing element 9 may specifically adopt an O-ring, and the exhaust hole 6-1 is located on the inner side of the O-ring; therefore, the air core 7 can better seal the exhaust hole 6-1 when the piston 3 is started to fire.
The inner end of the gas core 7 is provided with a conical part 7-1, the small end of the conical part 7-1 is close to the rodless cavity 4, and the large end of the conical part 7-1 is close to the exhaust hole 6-1; or the inner end of the gas core 7 is provided with a thin section, and the outer diameter of the outer end of the gas core 7 is larger than that of the thin section; or the inner end of the air core 7 is provided with a magnetic isolation gasket. The suction force between the gas core 7 and the magnet can be adjusted by the measures; wherein, the conical part 7-1 arranged on the gas core 7 or the thin section is used for realizing the adjustment of the suction force by changing the contact area between the gas core 7 and the magnet.
The end socket 6 is in threaded connection with an air faucet 5, the air faucet 5 is internally provided with the air flow channel 5-1, the air faucet 5 is provided with a side wing 5-2, and the magnetic adsorption piece 8 is clamped and fixed between the side wing 5-2 and the end socket 6; the magnetic force adsorption member 8 can be conveniently installed and fixed.
A sealing glue is arranged at the threaded connection position between the air tap 5 and the end enclosure or a raw material belt is wound on the threaded connection position; the threaded connection between the air assembling nozzle 5 and the end enclosure 6 is completely sealed, so that leakage is avoided; similarly, the end socket 6 can be fixed on the cylinder body 1 in a threaded manner, and the threaded connection between the end socket 6 and the cylinder body 1 can also be provided with sealant or wound with raw material belts, so that the threaded connection between the cylinder body 1 and the end socket 6 is completely sealed and blocked, and leakage is avoided.
The cross sections of the gas core 7 and the sliding hole 6-2 are circular, the axis of the sliding hole 6-2 is parallel to the axis of the rodless cavity 4, and the difference between the inner diameter of the sliding hole 6-2 and the outer diameter of the gas core 7 is 0.02-0.3 mm.
The difference between the inner diameter of the slide hole 6-2 and the outer diameter of the gas core 7 in this embodiment is preferably 0.1 mm.
In this embodiment, the compressing mechanism includes an elastic element 11, the elastic element 11 is disposed in the piston cavity 2, the piston 3 is pushed by the elastic force of the elastic element 11 to abut against the end enclosure assembly, the elastic element 11 may be a spring, one end of the elastic element 11 abuts against the cylinder 1, and the other end abuts against the piston 3;
or the pressing mechanism in this embodiment includes a magnetic element, the magnetic element is disposed in the head assembly, the piston 3 has a structure that can be adsorbed by the magnetic element, and the piston 3 abuts against the head assembly under the magnetic force adsorption of the magnetic element.
In this embodiment, a sealing gasket 13 is disposed on the piston 3, the air faucet 5 abuts against the sealing gasket 13, and the material of the sealing gasket 13 may be rubber.
The working principle of the embodiment is as follows:
when in use, the medicine core 15 filled with the liquid medicine is connected to the front end of the cylinder 1, and the piston rod 3-1 on the piston 3 in the cylinder 1 is opposite to the push rod 14 in the medicine core 15; then, an air source is communicated with a connector 12 on the end socket 6, the connector 12 is communicated with an air flow channel 5-1 in the air faucet 5, then, compressed air is introduced into the air flow channel 5-1 from the air source, when the pressure of the air in the air flow channel 5-1 is increased to a preset percussion pressure, the elasticity of an elastic element 11 is overcome, the air in the air flow channel 5-1 instantly rushes into the rodless cavity 4, the air core 7 is pushed to the air exhaust hole 6-1, the air exhaust hole 6-1 is plugged, the piston 3 is started to perform percussion under the drive of high-speed air flow, so that the piston 3 rapidly moves forwards, the push rod 14 is pushed by the piston rod 3-1 to eject the liquid medicine in the medicine core 15 at a high speed through a thin liquid flow, the liquid medicine instantly penetrates through the skin to reach the subcutaneous part.
Because of the arrangement of the gas core 7 and the vent hole 6-1, after the compressed gas pressure relief piston 3 is reset after injection is finished, the residual trace gas in the rodless cavity 4 can be directly discharged through the vent hole 6-1, so that the pressure in the rodless cavity 4 after reset is always consistent with the atmospheric pressure, and the gas core 7 can be pushed to the vent hole 6-1 by high-speed airflow during injection to block the vent hole 6-1, so that the piston 3 can finish starting and triggering under the drive of the high-speed airflow, thereby realizing that the piston 3 can have relatively stable starting and triggering pressure, and after the compressed gas is released after injection is finished, the gas core 7 resets under the magnetic adsorption of the magnetic adsorption piece 8; and the required sealing points are reduced, even if a little air leakage exists between the contact surfaces of the sealing gasket 13 and the air tap 5, the air can be discharged from the air vent 6-1, and the normal firing of the piston 3 is not influenced, so that the sealing difficulty between the piston 3 and the end socket assembly is greatly reduced, and the failure rate is also reduced.
Example 2
As shown in fig. 3, embodiment 2 differs from embodiment 1 in that: the preset resistance that overcomes when gas core 7 removes is elasticity, and the concrete structure is: the sliding hole 6-2 is provided with an exhaust spring 10, and the exhaust spring 10 is used for pushing the air core 7 to the inner end of the sliding hole 6-2; after the injection is finished and the pressure of the compressed gas is relieved, the gas core 7 is reset under the elastic action of the exhaust spring 10; the sealing member 9 in this embodiment may be a sealing gasket, and in order to improve the structural compactness, the inner end of the gas core 7 has a step surface, one section of the exhaust spring 10 abuts against the step surface of the gas core 7, the other end abuts against the sealing member 9, and the gas core 7 abuts against the side wing 5-2 of the gas nozzle 5 under the pushing of the exhaust spring 10.
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 (10)
1. The utility model provides a start stable device of dosing, is including barrel (1), piston (3), hold-down mechanism and the head subassembly that has piston chamber (2), and piston (3) slide to set up in piston chamber (2), its characterized in that: a rodless cavity (4) is formed between the end socket assembly and the piston (3), the end socket assembly is provided with an air flow channel (5-1), an air core (7) and an exhaust hole (6-1) for communicating the outside with the rodless cavity (4), the piston (3) is abutted against the end socket assembly under the action of a pressing mechanism so as to seal an outlet of the air flow channel (5-1), after the air in the air flow channel (5-1) is stored to the pressure thereof to overcome the acting force of the pressing mechanism on the piston (3), the piston (3) is fired, the air flow channel (5-1) is communicated with the rodless cavity (4), the air core (7) is arranged to be capable of moving towards the exhaust hole (6-1) and sealing the exhaust hole after overcoming the preset resistance of the air core (7) under the pressure of compressed air in the rodless cavity (4); when the pressure of the gas in the rodless cavity (4) to the gas core (7) is smaller than the preset resistance, the gas core (7) is far away from the exhaust hole (6-1), and the exhaust hole (6-1) is opened.
2. The start-stable drug delivery device of claim 1, wherein: the seal head assembly comprises a seal head (6), the seal head (6) is fixed at the upper end of the barrel body (1), the rodless cavity (4) is formed between the seal head (6) and the piston (3), a sliding hole (6-2) is formed in the seal head (6), the air core (7) is inserted in the sliding hole (6-2), a gap (6-3) is reserved between the air core (7) and the sliding hole (6-2), the rodless cavity (4) is communicated with the exhaust hole (6-1) through the gap (6-3), the exhaust hole (6-1) is located at the outer end of the sliding hole (6-2), and the rodless cavity (4) is located at the inner end of the sliding hole (6-2).
3. The start-stable drug delivery device of claim 2, wherein: the inner end of the sliding hole (6-2) is fixed with a magnetic adsorption piece (8) for adsorbing the air core (7) to the inner end of the sliding hole (6-2).
4. The start-stable drug delivery device of claim 2, wherein: the sliding hole (6-2) is internally provided with an exhaust spring (10), and the exhaust spring (10) is used for pushing the air core (7) to the inner end of the sliding hole (6-2).
5. The start-stable drug delivery device of claim 2, wherein: the outer end of the sliding hole (6-2) is provided with a sealing piece (9).
6. The start-stable drug delivery device of claim 3, wherein: the inner end of the gas core (7) is provided with a conical part (7-1), the small end of the conical part (7-1) is close to the rodless cavity (4), and the large end of the conical part (7-1) is close to the exhaust hole (6-1); or the inner end of the gas core (7) is provided with a thin section, and the outer diameter of the outer end of the gas core (7) is larger than that of the thin section; or the inner end of the air core (7) is provided with a magnetic isolation gasket.
7. The start-stable drug delivery device of claim 3, wherein: head (6) threaded connection has air cock (5), the inside of air cock (5) has airflow channel (5-1), flank (5-2) have on air cock (5), magnetic force adsorbs piece (8) to be fixed by the centre gripping between flank (5-2) and head (6).
8. The start-stable drug delivery device of claim 7, wherein: and a sealing glue is arranged at the threaded connection part between the air tap (5) and the end enclosure (6) or a raw material tape is wound on the threaded connection part.
9. The start-stable drug delivery device of claim 7, wherein: the cross sections of the gas core (7) and the sliding hole (6-2) are circular, the axis of the sliding hole (6-2) is parallel to the axis of the rodless cavity (4), and the difference between the inner diameter of the sliding hole (6-2) and the outer diameter of the gas core (7) is 0.02-0.3 mm.
10. The start-stable drug delivery device of claim 1, wherein: the pressing mechanism comprises an elastic element (11), the elastic element (11) is arranged in the piston cavity (2), and the piston (3) is pushed to abut against the end socket assembly under the elastic force of the elastic element (11); or the pressing mechanism comprises a magnetic element, the magnetic element is arranged in the end socket assembly, and the piston (3) is propped against the end socket assembly under the magnetic force adsorption of the magnetic element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020886764.6U CN213220055U (en) | 2020-05-22 | 2020-05-22 | Drug delivery device stable in starting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020886764.6U CN213220055U (en) | 2020-05-22 | 2020-05-22 | Drug delivery device stable in starting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213220055U true CN213220055U (en) | 2021-05-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020886764.6U Active CN213220055U (en) | 2020-05-22 | 2020-05-22 | Drug delivery device stable in starting |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213220055U (en) |
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2020
- 2020-05-22 CN CN202020886764.6U patent/CN213220055U/en active Active
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Effective date of registration: 20220110 Address after: 214400 Room 101, building 1, No. 21, Yingbin Road, Jiangyin City, Wuxi City, Jiangsu Province Patentee after: Jiangyin Electromechanical Technology Co.,Ltd. Address before: 225300 799-2 Yaocheng Avenue, Taizhou pharmaceutical hi tech Industrial Development Zone, Jiangsu Province (1108-32, building B, data building) Patentee before: Taizhou start medical technology Co.,Ltd. |