CN112569431A - Safe needleless injector with external dose display function - Google Patents

Safe needleless injector with external dose display function Download PDF

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Publication number
CN112569431A
CN112569431A CN202011433651.1A CN202011433651A CN112569431A CN 112569431 A CN112569431 A CN 112569431A CN 202011433651 A CN202011433651 A CN 202011433651A CN 112569431 A CN112569431 A CN 112569431A
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CN
China
Prior art keywords
spring
injection
injection cylinder
safety
pull rod
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Pending
Application number
CN202011433651.1A
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Chinese (zh)
Inventor
姚青云
杨惠杰
鲍其昌
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Yishukang Shandong Biotechnology Co ltd
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Yishukang Shandong Biotechnology Co ltd
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Priority to CN202011433651.1A priority Critical patent/CN112569431A/en
Publication of CN112569431A publication Critical patent/CN112569431A/en
Pending legal-status Critical Current

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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178Syringes
    • A61M5/30Syringes for injection by jet action, without needle, e.g. for use with replaceable ampoules or carpules
    • A61M5/3007Syringes for injection by jet action, without needle, e.g. for use with replaceable ampoules or carpules with specially designed jet passages at the injector's distal end
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178Syringes
    • A61M5/20Automatic syringes, e.g. with automatically actuated piston rod, with automatic needle injection, filling automatically
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178Syringes
    • A61M5/31Details
    • A61M5/3129Syringe barrels
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178Syringes
    • A61M5/20Automatic syringes, e.g. with automatically actuated piston rod, with automatic needle injection, filling automatically
    • A61M2005/2026Semi-automatic, e.g. user activated piston is assisted by additional source of energy

Abstract

The invention discloses a safe needleless injector with explicit dosage, which consists of a front injection cylinder part, a pressurizing and quantity adjusting part, a rear injection cylinder part and an injection safety part; the front injection cylinder part, the pressurizing and quantity adjusting part, the rear injection cylinder part and the injection safety part are made of aluminum metal materials through machining by a numerical control machine. The front half part of the pressurizing and quantity-adjusting part is screwed into the front injection cylinder part, the rear half part of the pressurizing and quantity-adjusting part is connected with the rear injection cylinder part through a clamping position and a screw, and the injection safety part is spun at the tail end of the rear injection cylinder part. When in use, the dosage medicine tube is clamped and fixed at the front end of the front injection cylinder part without a gap; then, the right-handed injection cylinder part finishes pressurizing and gear shifting, and the left-handed injection cylinder part finishes dosage adjustment and medicine suction; the safety cover of the injection safety component is taken down, the injection button is pressed, the spring releases the thrust force, the piston in the dosage medicine tube is driven to act, and the medicine liquid is quickly injected into a human body. The invention has the advantages of safe use, long service life, visual operation and labor saving.

Description

Safe needleless injector with external dose display function
Technical Field
The invention relates to a needleless injector, in particular to a needleless injector which has simple structure, safe use, accurate operation and long service life. The invention belongs to the technical field of medical instruments.
Background
Drug therapy is the primary route of medical treatment in humans. The medicine is mainly taken orally and injected in two ways. The traditional injection method is a needle injection, i.e. the medicine is injected into the human body through a stainless steel needle, and the traditional injection method has the following disadvantages: local skin damage, bleeding, swelling and pain and the like are easily caused, and subcutaneous nodules and other adverse conditions can be generated after long-term injection; not only is the pain significant, but also the fear is generated in most patients (especially infants).
Needleless injection is a newly developed technology in recent years, and the principle of high-pressure jet flow is utilized to enable liquid medicine to form a fine liquid flow which instantly penetrates through the skin to reach subcutaneous tissues. Because of the change of the injection principle, the liquid medicine is dispersed and distributed under the skin, the onset time is fast, and the medicine absorption rate is high. The needleless injection has the characteristics of no needle, no pain, no cross infection, high efficiency, safety and the like, and is particularly suitable for patients needing long-term self-administration treatment, such as patients with chronic hepatitis, diabetes, tumor and the like.
Currently, needleless injection is gradually applied to clinical medical treatment and family health care in developed countries, the research of China on needleless injection technology is still in the beginning stage, and only few domestic enterprises can produce needleless injectors. Although the price of the domestic needleless injector is lower than that of the needleless injector imported from abroad, the domestic needleless injector has a lower popularization rate for common consumers (patients), and the reason is that: 1. the structure is complex, the early-stage research and development cost is high, and the price is higher. The domestic needleless injector has a complex structure, and as the main parts are made of plastic materials, and one needleless injector is composed of dozens of parts, dozens of moulds are required to be opened, the early development cost is high, and the sale price of the needleless injector is high. 2. The service life is short. Because the domestic needleless injector is made of plastic materials, the injector is frequently used for a long time, the abrasion of components is large, and the service life is short. 3. Dosage display is not obvious, operation is not accurate, and dosage is not accurate. Because the plastic shell of the current domestic needleless injector is too smooth and is easy to slip during operation, the operation is inaccurate when the dosage is rotationally adjusted; in addition, the plastic parts wear out, which also causes inaccuracies in the selected dose. Particularly, the dosage display window of the current domestic needleless injector is small, the elderly patients often cannot see clearly, and the dosage is easy to select by mistake when selecting the dosage. 4. The product is slow to update. Because the domestic needleless injector is made of plastic materials, the production capacity of the die is large, the updating cost of the product is high, and the updating speed is slow.
Disclosure of Invention
In view of the above, it is an object of the present invention to provide an exogenously dosed safety needleless injector. The needleless injector is made of metal aluminum materials, and has the advantages of simple structure, safe use, long service life, external dosage, convenient operation and accurate dosage adjustment.
In order to achieve the purpose, the invention adopts the following technical scheme: a safe needleless injector with external dosage is composed of a front syringe part, a pressurizing and quantity adjusting part, a rear syringe part and an injection safety part; the front injection cylinder part, the pressurizing and quantity adjusting part, the rear injection cylinder part and the injection safety part are made of aluminum metal materials through machining by a numerical control machine;
the front injection barrel part comprises a front cover, a front injection barrel body, a spring pull rod assembly and a thrust spring; the front cover is clamped at the front end of the front injection cylinder body, the thrust spring is sleeved on the spring pull rod assembly, and the spring pull rod assembly sleeved with the thrust spring is arranged in the front injection cylinder body; the inner wall of the front injection cylinder body is provided with internal threads; dose scale lines and dose numbers which are directly observed are engraved on the surface of the front injection cylinder;
the pressurizing and quantity-adjusting part comprises a spring pressing cylinder, a limiting ejector rod, an ejector rod spring, a fixed sleeve and a button; the outer surface of the spring pressing barrel is provided with external threads, the spring pressing barrel is screwed into the front injection barrel part through the engagement of the external threads on the outer surface of the spring pressing barrel and the internal threads on the inner wall of the front injection barrel body, and the spring pressing barrel is sleeved outside a thrust spring of the front injection barrel part; the fixed sleeve is sleeved at the tail part of the spring pressing cylinder, and a circle of steel balls are fixed in the fixed sleeve; the top rod spring is sleeved outside the limiting top rod, one end of the limiting top rod extends into the spring pressing barrel and abuts against the tail end of the spring pull rod assembly of the front injection barrel part, and the other end of the limiting top rod abuts against the bottom surface of the button;
the front half part of the pressurizing quantity-adjusting component is screwed into the front injection cylinder component, and the rear half part of the pressurizing quantity-adjusting component is connected with the rear injection cylinder component through a clamping position and a screw; the injection safety component is spun at the tail end of the rear injection cylinder component;
when in use, the dosage medicine tube is clamped and fixed at the front end of the front injection cylinder part without a gap; then, the right-handed injection cylinder part finishes pressurizing and gear shifting, and the left-handed injection cylinder part finishes dosage adjustment and medicine suction; the safety cover of the injection safety component is taken down, the injection button is pressed, the thrust spring releases thrust, the piston in the dosage medicine tube is driven, and the medicine liquid is injected into a human body quickly.
In the preferred embodiment of the present invention, the injection safety component comprises a rear cover, an injection button and a safety cover; the rear cover is spun on the tail part of the rear injection cylinder part, and the injection key is abutted against the top of the button in the pressurizing and quantity adjusting part; a safety cover is arranged outside the injection key in a spinning mode; when in injection, the safety cover is taken down, so that the injection key can be pressed.
In the preferred embodiment of the invention, two streamline anti-skid grooves which are symmetrical left and right are arranged on the outer surface of the front injection cylinder; the outer surface of the rear injection tube component is also provided with two left-right symmetrical streamline anti-slip grooves.
In the preferred embodiment of the invention, the front injection cylinder is a hollow metal aluminum sleeve, the two ends of the hollow metal aluminum sleeve are open, the inner diameter and the shape of the front end opening are matched with the outer diameter and the shape of the dosage tube, and the dosage tube extends into the front injection cylinder through the front end opening and is clamped and fixed with a spring pull rod assembly arranged in the front injection cylinder in a gapless way; the inner diameter and the shape of the opening at the rear end just enable a spring pull rod assembly sleeved with a thrust spring to be arranged in the front injection cylinder body through the opening at the rear end.
In a preferred embodiment of the present invention, the spring pull rod assembly is formed by combining a spring pull rod and a pull rod head, and the pull rod head is in threaded connection with the tail of the spring pull rod; the outer diameter of the pull rod head is smaller than that of the spring pull rod, a circle of groove is arranged on the pull rod head, and in order to increase the friction force on the surface of the groove, the surface of the groove is subjected to flying treatment; the outer diameter of the front end of the spring pull rod is increased to form an inverted boss shape, an inward concave inner cavity is arranged at the front end of the inverted boss shape, and a piston push rod of the dosage medicine tube is clamped and fixed in the concave inner cavity in a gapless mode.
In the preferred embodiment of the invention, the surface of the rear barrel part is also engraved with indicators for dose upshifting and for the pressure exerted by the thrust spring.
In the preferred embodiment of the present invention, the spring barrel of the pressure and volume adjusting means moves backward 0.50mm for every 1 unit increase in insulin injection volume.
In a preferred embodiment of the invention, the internal thread on the inner wall of the front injection cylinder body of the front injection cylinder part and the external thread of the spring pressing cylinder of the pressurizing and quantity adjusting part are both rectangular threads, the thread pitch is 2mm, and the helix angle is 2.43 degrees.
In the preferred embodiment of the invention, the outer diameter of the thrust spring is 9.3mm, the diameter of the spring steel wire is 2.3mm, the total number of turns of the spring is 23 turns, the spiral distance of the spring is 4.0mm, the total length of the spring is 90.0mm, and two ends of the spring are ground flat; when the thrust spring is compressed by 1mm, the pressure can be generated by 16.5N, the pre-compression of the spring is 11.5mm, the maximum gear compression is 29.5mm, and the pressure is 486.75N; precompression L during spring assemblyPrepressing11.5 mm; compression L of pressurized engaging gearPress and press18 mm; total compression 29.50mm, compression ratio: 32.7 percent.
Drawings
FIG. 1 is a schematic perspective view of the present invention;
FIG. 2 is a front view of the present invention;
FIG. 3 is a cross-sectional view A-A of FIG. 2;
FIG. 4 is a schematic structural view of the components of the front syringe that make up the present invention;
FIG. 5 is a cross-sectional view A-A of FIG. 4;
FIG. 6 is a schematic view of a front syringe barrel configuration;
FIG. 7 is a cross-sectional view A-A of FIG. 6;
FIG. 8 is an enlarged view of part B of FIG. 4;
FIG. 9 is a perspective view of the spring pull rod assembly;
FIG. 10 is a front view of the spring pull rod assembly;
FIG. 11 is a cross-sectional view A-A of FIG. 10;
FIG. 12 is an exploded view of the pressure regulating member constituting the present invention;
FIG. 13 is a perspective view of a front syringe plug assembly;
FIG. 14 is a top view of the front syringe plunger assembly;
FIG. 15 is a cross-sectional view A-A of FIG. 14;
FIG. 16 is a cross-sectional view B-B of FIG. 14;
FIG. 17 is a schematic view showing the combination of the front syringe and the pressurizing and quantity-adjusting member;
FIG. 18 is a cross-sectional view A-A of FIG. 17;
FIG. 19 is a front view of the rear syringe barrel component comprising the present invention;
FIG. 20 is a cross-sectional view A-A of FIG. 19;
FIG. 21 is a schematic view of the injection safety component comprising the present invention;
fig. 22 is a sectional view a-a of fig. 21.
Detailed Description
The structure and features of the present invention will be described in further detail below with reference to the accompanying drawings and examples. It should be noted that various modifications can be made to the embodiments disclosed herein, and therefore, the embodiments disclosed in the specification should not be construed as limiting the structure of the present invention, but merely as exemplifications of embodiments, which are intended to make the features of the present invention obvious.
As shown in figures 1-3, the dosage explicit safe needleless injector disclosed by the invention is a liquid medicine thruster, which is composed of a front syringe component 1, a pressurizing and quantity-adjusting component 2, a rear syringe component 3 and an injection safety component 4; the front half part of the pressurizing and quantity-adjusting component 2 is screwed into the front injection cylinder component 1, the rear half part of the pressurizing and quantity-adjusting component 2 is clamped in the rear injection cylinder body and is connected with the rear injection cylinder component through screws, and the injection safety component 4 is spun at the tail end of the rear injection cylinder component 3. When in use, the front cover of the front syringe part is taken down, and the dosage medicine tube is connected with the front syringe part through screw threads; the front injection tube part 1 is held by the left hand, the rear injection tube part 3 is held by the right hand, the rear injection tube part 3 is rotated rightwards, the compression spring is pressurized and shifted, after the pressurization and shifting, the rear injection tube part 3 is rotated leftwards to adjust the injection dosage, and meanwhile, the dosage medicine tube absorbs the required medicine liquid; after the preparation is finished, the safety cover of the injection safety component is taken down, the injection key is pressed, the thrust of the spring is released, and the liquid medicine is pushed to be rapidly injected into the skin to finish the injection.
As shown in fig. 1, 4-11, the front syringe component 1 constituting the present invention includes a front cover 11, a front syringe body 12, a spring pull rod assembly 13, and a thrust spring 14; the front cover 11 is spinning-pressed at the front end of the front syringe barrel 12, the thrust spring 14 is sleeved on the spring pull rod assembly 13, and the spring pull rod assembly 13 sleeved with the thrust spring 14 is arranged in the front syringe barrel 12.
In order to reduce the manufacturing cost and save the cost of opening the mould, the front injection cylinder 12 of the invention is a hollow metal aluminum sleeve, the two ends of which are open, the inner diameter and the shape of the front end opening are matched with the outer diameter and the shape of the dosage medicine tube, so that the dosage medicine tube extends into the front injection cylinder through the front end opening and is clamped and fixed with a spring pull rod assembly 13 which is arranged in the front injection cylinder 12 without clearance; the rear opening has an inner diameter and shape just enough to accommodate a spring pull rod assembly 13 with a thrust spring 14 inside the front syringe barrel 12 through the rear opening.
The dose scale lines and the dose number 121 which can be directly observed are marked on the surface of the front injection cylinder body 12, the dose scale lines and the dose number 121 are clear, complete and obvious, a user can clearly, accurately and unmistakably adjust the liquid medicine dose according to the dose scale lines and the dose number 121, and the front injection cylinder body is particularly suitable for middle-aged and elderly patients.
Two streamlined anti-slip grooves 122 are also formed on the surface of the front syringe barrel 12 in bilateral symmetry. When the patient uses the injector, the fingers are placed in the streamline anti-slip grooves 122 to hold the needleless injector, the injection tube component 3 regulates the dosage after rotating and applies pressure to the thrust spring 14 in the injector, the operation is stable and reliable, the fingers do not slip, and the pressure is more labor-saving.
The spring pull rod assembly 13 is also made of aluminum, and is formed by combining the spring pull rod 131 and a pull rod head 132, wherein the outer diameter of the pull rod head 132 is smaller than that of the spring pull rod 131, and a ring of groove 1321 is formed on the pull rod head 132. The pull rod head 132 is connected with the tail part of the spring pull rod 131 through threads, and the thrust spring 14 is sleeved outside the spring pull rod 131. The outer diameter of the front end of the spring pull rod 131 is increased to form an inverted boss, and the front end of the inverted boss is provided with an inward concave inner cavity 1311.
The front cover 11 is spun on the front end of the front injection cylinder 12, and when in injection, the front cover 11 is taken down, as shown in fig. 5, the dosage medicine tube extends into the front injection cylinder through the front end opening of the front injection cylinder 12 and is clamped into the inner cavity 1311 at the front end of the spring pull rod 131, so that the dosage medicine tube is fixedly connected with the gapless clamp of the invention; after injection, the dosage cartridge is removed and the front cover 11 is spun onto the front end of the front injection barrel 12 to prevent dust from entering.
As shown in fig. 12, the pressurizing and quantity-adjusting component 2 of the present invention includes a spring pressing cylinder 21, a limit ejector 22, an ejector spring 23, a fixing sleeve 24, a button 25 and a front syringe stopper assembly 26.
In order to prolong the service life of the needleless injector and save the cost of opening the die, the pressurizing and quantity-adjusting part 2 is also made of metal material aluminum, and the spring pressing barrel 21 is a hollow aluminum sleeve, and the surface of the spring pressing barrel is provided with external threads 211. As shown in fig. 7 and 18, a section of screw thread 123 is opened at the rear part of the inner wall of the front syringe barrel 12, the spring pressing barrel 21 is sleeved outside the thrust spring 14, the external screw thread 211 on the outer surface of the spring pressing barrel 21 and the screw thread 123 on the inner wall of the front syringe barrel 12 are engaged and screwed into the front syringe barrel 12, so that the front part of the pressurization and volume adjustment part 2 is screwed into the front syringe barrel part 1.
The inner diameter and the outer diameter of the tail part of the spring pressing cylinder 21 are both reduced, and a section of hollow steel ball fixing column 212 protrudes out; a circle of steel ball through holes are formed in the side wall of the steel ball fixing column 212 at intervals, steel balls 213 are fixed in the steel ball through holes, and a fixing sleeve 24 is covered outside the steel balls 213 to prevent the steel balls 213 from falling off. The top rod spring 23 is sleeved outside the limiting top rod 22, one end of the limiting top rod 22 penetrates through the steel ball fixing column 212 and extends into the spring pressing barrel 21 until abutting against the pull rod head 132 of the spring pull rod assembly of the front syringe part 1, and the other end abuts against the bottom surface of the button 25.
A front syringe stopper assembly 26 for limiting the backward movement of the front syringe part 1 is sleeved outside the spring pressing cylinder 21. At least two positioning grooves 215 for longitudinally positioning the front syringe plug assembly 26 to move longitudinally are formed on the outer wall of the spring pressing cylinder 21.
As shown in fig. 12, 17 and 18, when the button of the needleless injector is pressed to push the front syringe assembly for injection, the front syringe part 1 is limited to move backwards, and a front syringe stopper assembly 26 is arranged at the tail part of the front syringe part 1 outside the spring pressing cylinder 21. As shown in fig. 13-16, the inner diameter of the front syringe stopper assembly 26 decreases from bottom to top to form a step 261, the inner wall thereof is symmetrically provided with positioning grooves 262, and correspondingly, the side wall of the rear portion of the spring pressing cylinder 21 is provided with positioning projections 214 (see fig. 12), and the positioning projections 214 pass through the positioning grooves 262. A positioning bead 263 is further disposed on the inner wall of the front syringe stopper assembly 26, and when the dosage adjustment is performed, the positioning bead 263 slides along the positioning groove 215 on the side wall of the spring pressing cylinder 21.
As shown in fig. 12 and 18, the pressurizing and quantity-adjusting member 2 further includes a bearing 27, and the bearing 27 is disposed inside the spring pressing cylinder 21 and at the end of the thrust spring 14, and receives the pressure generated by the thrust spring 14 during the pressurizing process.
As shown in fig. 1, 3, 19 and 20, the rear syringe member 3 is fastened to the rear portion of the pressure adjustment member 2 by screws. The rear syringe component 3 is a hollow cylinder, and a fixing plate 31 for fixing the pressurizing and volume-adjusting component 2 is arranged in the rear part of the hollow cylinder. Two bilaterally symmetrical streamline anti-slip grooves 32 are formed in the surface of the rear syringe component 3, and when a patient injects, the patient holds the needleless injector with hands and places fingers in the streamline anti-slip grooves 32. Because the user needs the left and right hand rotatory syringe casing simultaneously when adjusting needleless syringe dosage, produces the moment of torsion, and current homemade needleless syringe casing surface is smooth, relies on user's palm and barrel surface friction completely to produce the moment of torsion, and hard and the phenomenon of skidding often appears, and dosage adjustment is hard. The invention designs streamline anti-slip grooves on the outer surfaces of the front and the back syringe parts of the injector, when a user pressurizes and adjusts the dosage, the fingers of the left hand press the anti-slip grooves 122 on the outer surface of the front syringe part, the fingers of the right hand press the anti-slip grooves 32 on the outer surface of the back syringe part, the rear syringe part 3 is rotated to adjust the dosage and apply pressure to the thrust spring 14 in the injector, the operation is stable and reliable, the fingers do not slip, and the pressurizing is more labor-saving.
For user convenience, the present invention also includes indicia 33 engraved into the surface of the rear barrel part 3 for dosage shifting and for applying pressure to the thrust spring.
As shown in fig. 1, 21 and 22, the rear syringe barrel member 3 of the present invention is further provided with an injection-safe member 4 formed by spinning on its rear end portion. The injection safety member 4 comprises a back cover 41, an injection button 42 and a safety cover 43. A rear cover 41 is spun on the rear of the rear barrel section 3 and an injection button 42 rests on top of the button 25 in the pressurized metering section 2. A safety cover 43 is screwed on the outside of the injection button 42. During injection, the safety cover 43 is removed, the injection button 42 is pressed to press the button 25 of the pressurizing and quantity-adjusting part 2, the spring pull rod assembly 13 is released, the piston push rod in the dosage tube is pushed, the piston push rod pushes the piston in the dosage tube, liquid medicine is released, and needle-free injection is completed. After the injection is finished, the safety cover 43 is clamped outside the injection button 42. Because the safety cover 43 is clamped and fixed outside the injection key 42, the injection key 42 can not be pressed without removing the safety cover 43, therefore, the invention prevents the injection key 42 from being operated by mistake by adding the safety cover 43, and enhances the use safety of the needleless injector.
In order to prolong the service life of the needleless injector and save the cost of opening the mould, the rear injection tube part 3 and the injection safety part 4 are both made of metal aluminum.
The working principle of the invention, as shown in fig. 1 and 3, before injection, the front cover 11 of the front syringe assembly 1 is removed; inserting a dosage cartridge from the front end of the front syringe part 1, and clamping and fixing the dosage cartridge with the front end of a spring pull rod assembly 13 of the front syringe part 1 without clearance; then, the left hand holds the anti-slip groove 122 on the outer surface of the front syringe part 1 of the needleless injector, the right hand holds the anti-slip groove 32 on the outer surface of the rear syringe part 3 of the needleless injector, the right hand rotates the rear syringe part 3, because the rear half part of the pressurization quantity adjusting part 2 is clamped with the rear syringe part 3, the rear syringe part 3 drives the pressurization quantity adjusting part 2 to rotate and move forwards along the inner wall thread of the front syringe part 1, the spring pressing cylinder 21 of the pressurization quantity adjusting part 2 compresses the thrust spring 14, the thrust spring 14 is compressed, meanwhile, the steel ball 213 on the rear part of the spring pressing cylinder of the pressurization quantity adjusting part 2 slides into the groove 1321 of the pull rod head 132 of the spring pull rod assembly 13 of the front syringe part 1, the pressurization is completed, and the thrust spring 14 of the front syringe part 1 is in a pressurized state;
then the rear syringe component 3 is rotated left, the rear syringe component 3 drives the pressurizing quantity-adjusting component 2 to move backwards, and because the steel balls 213 at the rear part of the spring pressure cylinder of the pressurizing quantity-adjusting component 2 slide into the groove 1321 of the pull rod head 132 of the spring pull rod assembly 13 of the front syringe component 1, the rear syringe component 3 pulls the spring pull rod assembly 13 of the front syringe component 1 to move backwards through the pressurizing quantity-adjusting component 2, and the spring pull rod 123 in the spring pull rod assembly 13 pulls the piston pull rod and the piston in the dosage tube to move backwards; the user can adjust the dosage of the liquid medicine according to the dosage ordered by the doctor through the scale marks 121 on the outer surface of the front syringe part 1;
finally, the safety cover 43 of the injection safety part 4 is removed, the injection button 42 is pressed, the limit mandril 22 is pressed through the button 25 of the rear syringe barrel part 3, the steel ball 213 at the rear part of the spring pressing barrel of the pressurization quantity adjusting part 2 slides out from the groove 1321 of the pull rod head 132 of the spring pull rod assembly 13 of the front syringe barrel part 1, the thrust spring 14 is released, the spring pull rod 131 moves forwards under the action of the thrust spring 14, the piston pull rod in the dosage medicine tube is pushed to move forwards, the piston pull rod pushes the piston to move forwards, the medicine liquid in the dosage medicine tube is ejected, and the needleless injection is completed.
The invention can be used for injecting insulin for a long time by diabetics, and in order to ensure accurate dosage of injected liquid medicine, the structural design of the needleless injector is ensured to be reasonable, and the design parameters of all components of the needleless injector are also considered.
As is well known, 1 dosage unit of insulin (1IU) ═ 0.01mL ═ 10mm3In the specific embodiment of the invention, the diameter D of the inner cavity of the needleless injector dosage medicine tube is 5.04mm, and the radius R is 2.52 mm; 1IU 0.01ml 10mm3=πr2H; distance of advance of injectionh=10/πr20.50 mm. That is, if the inner diameter (diameter) of the needleless injector dosing cartridge is 5.04mm, 1 unit of insulin is injected and the injection advance distance should be 0.50 mm. In a specific embodiment of the invention, the patient rotates the rear syringe member of the needleless injector according to the self-administration amount, and the spring pressing cylinder in the pressurizing and quantity adjusting part moves backwards by 0.50mm every time the patient rotates a gear/1 dosage unit until the patient needs the administration amount.
In the embodiment of the invention, 5 steel balls are arranged in a steel ball fixing column at the rear part of a spring pressing cylinder of the pressure regulating component 2, each time the spring pressing cylinder rotates for one circle, the spring pressing cylinder in the pressure regulating component moves backwards by 0.50mm, 1 dose unit, namely 0.01ml of insulin can be injected, and each time the pressure regulating component rotates for one gear, the spring pressing cylinder in the pressure regulating component moves backwards by 0.50mm multiplied by 4, namely 2mm, so that the thread pitch of the internal thread 123 of the front injection cylinder component and the external thread 211 of the spring pressing cylinder in the pressure regulating component is 2mm, the helix angle is 2.43 degrees, and the thread is designed into a rectangular thread, so that the thread strength is increased, and the service life of a product is prolonged.
The needleless injector forms a fine liquid flow by using a high-pressure jet principle, and the liquid medicine penetrates through the skin instantly to reach subcutaneous tissues. As the diameter of the inner cavity of the dosage cartridge produced by a pharmaceutical factory is 5.04mm, in order to push the liquid medicine in the dosage cartridge to be sprayed out through the spray hole, the outer diameter of the thrust spring 14 selected by the invention is 9.3mm, the diameter of the spring steel wire is 2.3mm, the total number of turns of the spring is 23 circles, the spiral distance of the spring is 4.0mm, the total length of the spring is 90.0mm, and the two ends of the spring are ground flat. The thrust spring is made of 65Mn material, and the quenching rate of the thrust spring is 50-55 HRC. When the thrust spring selected by the specific embodiment of the invention is compressed by 1mm, the pressure can be generated by 16.5N, the spring is precompressed by 11.5mm, the maximum gear shifting is compressed by 29.5mm, the pressure is generated by 486.75N, and the liquid medicine in the dosage medicine tube can be completely sprayed out through the spray hole. The precompression L precompresses to 11.5mm when the spring is assembled; compressing L pressure of the pressure gear to 18 mm; the total compression was 29.50mm and the compression was 32.7%.
The invention has the advantages that:
1. simple structure, low early research and development cost and fast product updating.
Because the invention is made of the metallic aluminum material, can be made into various shapes by a numerical control machine, compared with the traditional needleless injector made of plastic materials, the invention has the advantages of simple structure, high manufacturing precision, low early research and development cost and fast product updating and updating, and the cost for processing a mould is saved.
2. The service life is long.
Because the invention is made of metal aluminum material, the whole weight is light, the intensity is high, the service life is long; good wear resistance, high integral manufacturing precision and accurate dosage adjustment.
3. The dosage scale is clear and visual, and the operation is convenient.
The invention clearly and completely engraves dosage scale lines and dosage numbers on the outer surface of the front injection cylinder body, thereby facilitating the user to accurately and intuitively adjust the dosage.
4. Good hand feeling, labor-saving, accurate and convenient dose adjustment.
Because the streamline anti-slip groove is formed in the outer surface of the injector, a user can hold the injector with hands, and the left finger and the right finger can press the streamline anti-slip groove to pressurize and adjust the dosage of the injection tube part after rotating the injector with labor saving and accuracy, thereby overcoming the defects of slippage and inaccurate dosage adjustment of the traditional domestic plastic needleless injector.
5. Can effectively prevent misoperation and is safer to use.
The safety cover is covered outside the injection key, and the injection key cannot be pressed when the safety cover is not taken down, so the invention prevents the injection key from being operated by mistake by additionally arranging the safety cover, and enhances the use safety of the needleless injector.
Finally, it should be noted that: the above-mentioned embodiments are only used for illustrating the technical solution of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention. Scope of the technical solutions of the embodiments.

Claims (9)

1. An exogenously dosed safety needleless syringe characterized by: it is composed of a front injection cylinder part, a pressurizing and quantity adjusting part, a rear injection cylinder part and an injection safety part; the front injection cylinder part, the pressurizing and quantity adjusting part, the rear injection cylinder part and the injection safety part are made of aluminum metal materials through machining by a numerical control machine;
the front injection barrel part comprises a front cover, a front injection barrel body, a spring pull rod assembly and a thrust spring; the front cover is clamped at the front end of the front injection cylinder body, the thrust spring is sleeved on the spring pull rod assembly, and the spring pull rod assembly sleeved with the thrust spring is arranged in the front injection cylinder body; the inner wall of the front injection cylinder body is provided with internal threads; dose scale lines and dose numbers which are directly observed are engraved on the surface of the front injection cylinder;
the pressurizing and quantity-adjusting part comprises a spring pressing cylinder, a limiting ejector rod, an ejector rod spring, a fixed sleeve and a button; the outer surface of the spring pressing barrel is provided with external threads, the spring pressing barrel is screwed into the front injection barrel part through the engagement of the external threads on the outer surface of the spring pressing barrel and the internal threads on the inner wall of the front injection barrel body, and the spring pressing barrel is sleeved outside a thrust spring of the front injection barrel part; the fixed sleeve is sleeved at the tail part of the spring pressing cylinder, and a circle of steel balls are fixed in the fixed sleeve; the ejector rod spring is sleeved outside the limiting ejector rod, one end of the limiting ejector rod extends into the spring pressing barrel and directly abuts against the tail end of the spring pull rod assembly of the front injection barrel part, and the other end of the limiting ejector rod abuts against the bottom surface of the button;
the front half part of the pressurizing quantity-adjusting component is screwed into the front injection cylinder component, and the rear half part of the pressurizing quantity-adjusting component is connected with the rear injection cylinder component through a clamping position and a screw; the injection safety component is spun on the tail end of the rear injection cylinder component;
when in use, the dosage medicine tube is clamped and fixed at the front end of the front injection cylinder part without a gap; then, the rear injection tube part is rotated rightwards to complete pressurization and gear shifting, and the rear injection tube part is rotated leftwards to complete dosage adjustment and medicine suction; the safety cover of the injection safety component is taken down, the injection button is pressed, the thrust spring releases thrust, the piston in the dosage medicine tube is driven, and the medicine liquid is injected into a human body quickly.
2. The dose-fired safety needleless syringe according to claim 1, wherein: the injection safety component comprises a rear cover, an injection key and a safety cover;
the rear cover is in spinning connection with the tail of the rear injection cylinder part, and the injection key abuts against the top of the button in the pressurizing and quantity-adjusting part;
a safety cover is arranged outside the injection key in a spinning mode; when in injection, the safety cover is taken down, so that the injection key can be pressed.
3. The dose-fired safety needleless syringe according to claim 2, wherein: the outer surface of the front injection cylinder body is provided with two streamline anti-skid grooves which are symmetrical left and right;
the outer surface of the rear injection tube component is also provided with two left-right symmetrical streamline anti-slip grooves.
4. The dose-fired safety needleless syringe according to claim 3, wherein: the front injection cylinder body is a hollow metal aluminum sleeve, the two ends of the hollow metal aluminum sleeve are provided with openings, the inner diameter and the shape of the front end opening are matched with the outer diameter and the shape of a dosage medicine tube, and the dosage medicine tube extends into the front injection cylinder body through the front end opening and is clamped and fixed with a spring pull rod assembly arranged in the front injection cylinder body in a gapless manner; the inner diameter and the shape of the opening at the rear end just enable a spring pull rod assembly sleeved with the thrust spring to be arranged in the front injection cylinder body through the opening at the rear end.
5. The dose-fired safety needleless injector of claim 4, wherein: the spring pull rod assembly is formed by combining a spring pull rod and a pull rod head, and the pull rod head is in threaded connection with the tail part of the spring pull rod;
the outer diameter of the pull rod head is smaller than that of the spring pull rod, a circle of groove is formed in the pull rod head, and the surface of the groove is subjected to flying treatment in order to increase the friction force on the surface of the groove;
the outer diameter of the front end of the spring pull rod is increased to form an inverted boss shape, an inward concave inner cavity is arranged at the front end of the inverted boss shape, and a piston push rod of the dosage medicine tube is clamped and fixed in the concave inner cavity in a gapless mode.
6. The dose-fired safety needleless injector of claim 5, wherein: also engraved on the surface of the rear barrel part are dose upshifts and indicators of the pressure exerted on the thrust spring.
7. The dose-fired safety needleless injector of claim 6, wherein: the spring barrel of the pressure regulating member moves backward 0.50mm for every 1 unit increase of the insulin injection amount.
8. The dose-fired safety needleless syringe according to claim 7, wherein: the inner thread on the inner wall of the front injection cylinder body of the front injection cylinder part and the outer thread of the spring pressure cylinder of the pressurizing and quantity adjusting part are both rectangular threads, the thread pitch is 2mm, and the helix angle is 2.43 degrees.
9. The dose-fired safety needleless injector of claim 8, wherein: the outer diameter of the thrust spring is 9.3mm, the diameter of a spring steel wire is 2.3mm, the total number of turns of the spring is 23, the spiral distance of the spring is 4.0mm, the total length of the spring is 90.0mm, and two ends of the spring are ground flat;
when the thrust spring is compressed by 1mm, the pressure can be generated by 16.5N, the pre-compression of the spring is 11.5mm, the maximum gear compression is 29.5mm, and the pressure is 486.75N; precompression L during spring assemblyPrepressing11.5 mm; compression L of pressurized engaging gearPress and press18 mm; total compression 29.50mm, compression ratio: 32.7 percent.
CN202011433651.1A 2020-12-10 2020-12-10 Safe needleless injector with external dose display function Pending CN112569431A (en)

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Publication number Priority date Publication date Assignee Title
WO2021168580A1 (en) * 2020-02-27 2021-09-02 Idee International R&D Inc. Adjustable dose needleless injector
CN113413515A (en) * 2021-07-13 2021-09-21 曲靖市妇幼保健院 Painless injection system of paediatrics
WO2023097974A1 (en) * 2021-11-30 2023-06-08 苏州和林微纳科技股份有限公司 Vertical injection mechanism of needle-free injector

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JP2002360691A (en) * 2001-06-11 2002-12-17 Eisuke Fujimoto Portable needleless syringe
JP2008086689A (en) * 2006-10-05 2008-04-17 Shimadzu Corp Needleless injector
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WO2021168580A1 (en) * 2020-02-27 2021-09-02 Idee International R&D Inc. Adjustable dose needleless injector
CN113413515A (en) * 2021-07-13 2021-09-21 曲靖市妇幼保健院 Painless injection system of paediatrics
CN113413515B (en) * 2021-07-13 2022-08-26 曲靖市妇幼保健院 Painless injection system of paediatrics
WO2023097974A1 (en) * 2021-11-30 2023-06-08 苏州和林微纳科技股份有限公司 Vertical injection mechanism of needle-free injector

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Application publication date: 20210330