CN105709310B - Low-resistance syringe - Google Patents

Low-resistance syringe Download PDF

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Publication number
CN105709310B
CN105709310B CN201610212491.5A CN201610212491A CN105709310B CN 105709310 B CN105709310 B CN 105709310B CN 201610212491 A CN201610212491 A CN 201610212491A CN 105709310 B CN105709310 B CN 105709310B
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China
Prior art keywords
rubber plug
inner cavity
spherical
end surface
clamping joint
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CN201610212491.5A
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Chinese (zh)
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CN105709310A (en
Inventor
曾文广
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Guangxi Huadu Medical Equipment Co ltd
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Guangxi Huadu Medical Equipment Co ltd
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES 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
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES 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
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/31—Details
    • A61M5/3129—Syringe barrels
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES 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
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/31—Details
    • A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
    • A61M5/31511—Piston or piston-rod constructions, e.g. connection of piston with piston-rod
    • A61M5/31513—Piston constructions to improve sealing or sliding
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES 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
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/31—Details
    • A61M5/3129—Syringe barrels
    • A61M2005/3131—Syringe barrels specially adapted for improving sealing or sliding

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  • Health & Medical Sciences (AREA)
  • Vascular Medicine (AREA)
  • Engineering & Computer Science (AREA)
  • Anesthesiology (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Hematology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)

Abstract

The invention discloses a low-resistance injector, which comprises an outer sleeve, a rubber plug and a core bar, wherein the upper end and the lower end of the rubber plug are both inwards sunken spherical end surfaces, the upper surface and the lower surface of an inner cavity of the rubber plug are also spherical surfaces, the upper edge and the lower edge of the side surface of the rubber plug are respectively provided with a circle of sealing rings which are abutted against the wall of the inner cavity of the outer sleeve, and the lower end of the rubber plug is provided with an opening; the top end of the core rod is provided with a clamping joint, a push plate is arranged below the clamping joint, the clamping joint is sleeved in the inner cavity of the rubber plug, and the push plate abuts against the outer edge of the lower spherical end surface of the rubber plug; the clamping joint is a circular plate, a plurality of convex points are arranged on the top surface and the bottom surface of the clamping joint, and the heights of the convex points on the two surfaces are gradually increased from the inner ring to the outer ring so as to form multi-point support for the upper spherical surface and the lower spherical surface of the inner cavity of the rubber plug. Compared with the injector with the conventional structure, the injector can realize the suction and the injection of the liquid medicine only by using smaller force while ensuring the good sealing property by changing the structures of the rubber plug and the core rod, thereby reducing the working strength of medical personnel and improving the working efficiency.

Description

Low-resistance syringe
Technical Field
The invention relates to a low-resistance injector, and belongs to the technical field of medical instruments.
Background
The injector is a medical apparatus commonly used in clinic, which generally comprises an outer sleeve, a rubber plug and a core bar, wherein the rubber plug is sleeved at the head part of the core bar to form a push rod when in use, the push rod is arranged in an inner cavity of the outer sleeve, and the sealing state is achieved through the interference fit of the rubber plug and the inner cavity wall of the outer sleeve, so that the injector does not leak liquid when sucking and injecting liquid medicine. In order to ensure complete sealing and no liquid leakage, a rubber plug of a clinically used syringe needs to be provided with 2-3 sealing rings and forms enough interference with the inner cavity wall of the outer sleeve, but the large interference of the sealing rings can lead the rubber plug to be tightly matched with the inner cavity wall of the outer sleeve, and medical workers can move the rubber plug only by using larger force when using the syringe to suck and push liquid medicine. As medical care personnel usually need to push and pull the syringe hundreds of times every day, the use of the conventional high-resistance syringe not only can increase the working strength, but also wastes time and labor and has low efficiency. In addition, some low-resistance syringes appear in the market at present, but most of the syringes have complex structures or poor clinical use effect, and are difficult to effectively popularize and use.
Disclosure of Invention
The invention aims to provide a low-resistance syringe, which can realize the suction and injection of liquid medicine by only using small force while ensuring good sealing property by changing the structures of a rubber plug and a core rod, thereby reducing the working strength of medical personnel and improving the working efficiency.
The invention adopts the following specific technical scheme:
a low-resistance syringe comprises a jacket, a rubber plug and a core rod, wherein the rubber plug is of a hollow structure provided with an inner cavity, the upper end of the rubber plug is a spherical end surface which is concave downwards, the lower end of the rubber plug is a spherical end surface which is concave upwards, the upper surface and the lower surface of the inner cavity of the rubber plug are spherical surfaces and are respectively consistent with the shapes of the upper spherical end surface and the lower spherical end surface of the outside, the upper edge and the lower edge of the side surface of the rubber plug are respectively provided with a circle of sealing ring which is abutted against the wall of the inner cavity of the jacket, and the lower end of the rubber plug is provided with an opening communicated with the inner cavity of the rubber plug; the top end of the core rod is provided with a clamping joint, a push plate is arranged below the clamping joint of the core rod, the clamping joint is sleeved in the inner cavity of the rubber plug, and the push plate abuts against the outer edge of the lower spherical end surface of the rubber plug; the bayonet joint is a circular plate, a plurality of protruding points are arranged on the top surface and the bottom surface of the bayonet joint, the protruding points are evenly distributed along the circle center of the circular plate in a plurality of circles, and the height of the protruding points on the two surfaces is gradually increased from the inner circle to the outer circle so as to form multi-point support for the upper spherical surface and the lower spherical surface of the inner cavity of the rubber plug.
Preferably, the sealing rings on the upper edge and the lower edge of the side surface of the rubber plug are tangent to the outer edges of the upper spherical end surface and the lower spherical end surface of the rubber plug respectively, so that the deformation of the spherical end surfaces of the rubber plug can be effectively transferred to the sealing rings.
Preferably, the central angle of the circular arcs of the cross sections of the upper spherical end surface and the lower spherical end surface of the rubber plug is 5-30 degrees.
Preferably, the opening at the lower end of the rubber plug adopts a circular opening and is provided with a chamfer angle, so that the clamping head of the core rod can be conveniently sleeved in the inner cavity of the rubber plug.
Preferably, the opening at the lower end of the rubber plug is a cross-shaped groove opening, so that after the clamping head of the core rod is sleeved in the inner cavity of the rubber plug, the convex points on the bottom surface of the clamping head can support more point positions on the lower spherical surface of the inner cavity of the rubber plug.
Preferably, the top surface of the outer sleeve is provided with a plane or an inwards concave spherical surface to match with the shape of the rubber plug.
The upper end and the lower end of the rubber plug of the injector are provided with the inward-concave spherical end surfaces, the rubber plug sealing rings are driven to expand through the deformation of the spherical end surfaces of the rubber plug in the drawing and pushing processes, so that effective sealing is realized, at most, only one circle of the upper sealing ring and the lower sealing ring of the rubber plug is in large interference fit with the inner cavity wall of the outer sleeve in the drawing and pushing processes, and the sliding resistance of the injector is obviously smaller than that of the injector with the conventional structure, so that the injector can draw and inject liquid medicine by using smaller force while ensuring good sealing performance, thereby reducing the working strength of medical personnel and improving the working efficiency.
Drawings
Fig. 1 is a sectional view of a syringe of a conventional structure.
FIG. 2 is a cross-sectional view of the low drag syringe of the present invention.
Figure 3 is a cross-sectional view of the plug.
Fig. 4 is a bottom view of the rubber plug with a circular opening at the lower end.
Fig. 5 is a bottom view of the rubber plug with the lower end opening being a cross-shaped groove opening.
Fig. 6 is a schematic structural view of the core rod.
FIG. 7 is a schematic view of the raised point distribution on the top surface of the mandrel snap.
In the figure: 1-outer sleeve, 2-rubber plug, 2.1-inner cavity of rubber plug, 2.2-sealing ring, 2.3-opening, 3-core bar, 3.1-clamping joint, 3.2-push plate and 3.3-convex point.
Detailed Description
The present invention is further illustrated by the following specific examples.
The injector with the conventional structure is shown in figure 1, a rubber plug with 2-3 sealing rings is generally adopted, the head of the rubber plug is in a sharp cone shape, and in order to ensure good sealing performance, large interference fit needs to be formed between the rubber plug sealing ring and the inner cavity wall of the outer sleeve, so that the resistance of the injector in the processes of suction and ejection is very large.
The low-resistance syringe disclosed by the invention is shown in figures 2-7 and comprises an outer sleeve 1, a rubber plug 2 and a core bar 3. The rubber plug 2 is of a hollow structure provided with an inner cavity, the upper end of the rubber plug 2 is a spherical end face which is concave downwards, the lower end of the rubber plug 2 is a spherical end face which is concave upwards, and the central angle of the section arc of the spherical end face is 5-30 degrees. The upper and lower surfaces of the inner cavity 2.1 of the rubber plug are spherical surfaces which are respectively consistent with the shapes of the upper and lower spherical end surfaces of the outside. The upper edge and the lower edge of the side surface of the rubber plug 2 are respectively provided with a circle of sealing ring 2.2 which is propped against the inner cavity wall of the outer sleeve 1, and the upper sealing ring 2.2 and the lower sealing ring 2 are respectively tangent with the outer edges of the upper spherical end surface and the lower spherical end surface of the rubber plug 2. The lower end of the rubber plug 2 is provided with an opening 2.3 communicated with the rubber plug inner cavity 2.1. The top end of the core bar 3 is provided with a clamping joint 3.1, a push plate 3.2 is arranged below the clamping joint 3.1 of the core bar 3, the clamping joint 3.1 is sleeved in the inner cavity 2.1 of the rubber plug, and the push plate 3.2 abuts against the outer edge of the lower spherical end surface of the rubber plug 2; the clamping joint 3.1 is a circular plate, a plurality of protruding points 3.3 are arranged on the top surface and the bottom surface of the clamping joint, the protruding points 3.3 are evenly distributed along the circle center of the circular plate in a multi-circle mode, the height of the protruding points 3.3 on the two surfaces is gradually increased from the inner circle to the outer circle, and therefore multi-point support is formed on the upper spherical surface and the lower spherical surface of the rubber plug inner cavity 2.1.
As shown in figure 4, the opening 2.3 at the lower end of the rubber plug 2 can be a circular opening and is provided with a chamfer angle, so that the clamping joint 3.1 of the core bar 3 can be conveniently sleeved in the inner cavity 2.1 of the rubber plug. As shown in fig. 5, the opening 2.3 at the lower end of the rubber plug 2 can also be a cross-shaped opening, so that after the bayonet joint 3.1 of the core rod 3 is sleeved in the rubber plug inner cavity 2.1, the convex point 3.3 at the bottom surface of the bayonet joint 3.1 can support more points on the lower spherical surface of the rubber plug inner cavity 2.1. In addition, as shown in fig. 1, in order to match the shape of the rubber plug 2, the top surface of the outer sleeve 1 may be a plane or an inwardly concave spherical surface, so that no residual liquid medicine is left when the liquid medicine is ejected.
The working principle of the low-resistance injector is as follows:
when the liquid medicine is sucked, a negative pressure lower than the atmospheric pressure is formed in the sealing cavity of the outer sleeve 1, the rubber plug 2 is pulled by the clamping joint 3.1 of the core rod 3, the lower spherical surface of the inner cavity 2.1 of the rubber plug is attached to the bottom surface of the circular plate of the clamping joint 3.1 under the combined action of the atmospheric pressure and the pulling force of the core rod 3, and the concave spherical end surface of the lower end of the rubber plug 2 is flattened to deform to a certain extent, so that the lower sealing ring 2.2 is expanded outwards to form good sealing with the inner cavity wall of the outer sleeve 1; meanwhile, the concave spherical end surface at the upper end of the rubber plug 2 has slight inward shrinkage deformation, so that the upper sealing ring 2.2 shrinks, the resistance is reduced, but the upper spherical end surface of the rubber plug 2 cannot be excessively shrunk due to the support of the convex point 3.3 of the top surface of the clamping joint 3.1, and the sealing of the upper sealing ring 2.2 cannot be completely failed.
When the liquid medicine is ejected, the rubber plug 2 is pushed by the clamping head 3.1 of the core rod 3 and the push plate 3.2 together, under the combined action of the liquid medicine reaction force and the pushing force of the core rod 3, the upper spherical end surface of the rubber plug inner cavity 2.1 can be attached to the top surface of the circular plate of the clamping head 3.1, and the concave spherical end surface at the upper end of the rubber plug 2 can be flattened to deform to ensure that the upper sealing ring 2.2 is outwards opened to form good sealing with the inner cavity wall of the outer sleeve 1; meanwhile, the concave spherical end surface at the lower end of the rubber plug 2 has slight inward shrinkage deformation, so that the lower sealing ring 2.2 shrinks, the resistance is reduced, but the lower spherical end surface of the rubber plug 2 cannot be excessively shrunk due to the support limit of the convex point 3.3 at the bottom surface of the clamping joint 3.1, and the sealing of the lower sealing ring 2.2 cannot be completely failed. It should be noted that, the interference magnitude of the upper sealing ring 2.2 is directly proportional to the reaction force of the liquid medicine during the pushing, the faster the pushing speed or the greater the viscosity of the liquid medicine, the greater the reaction force of the liquid medicine, the greater the flattening deformation of the spherical end surface at the upper end of the rubber plug 2, the greater the interference magnitude of the upper sealing ring 2.2, the better the sealing performance, and the liquid leakage phenomenon due to the large reaction force of the liquid medicine will not occur, for the liquid medicine with the smaller reaction force, the deformation of the spherical end surface at the upper end of the rubber plug 2 is very small, the shape of the spherical end surface at the upper end of the rubber plug 2 is basically kept unchanged under the supporting and limiting of the convex point 3.3 at the top surface of the bayonet joint 3.1, the interference magnitude of the upper sealing ring 2.2 is not large, and the sliding of the rubber plug can be very flexible.
Therefore, in the process of sucking and ejecting the liquid medicine, at most, only one circle of the upper sealing ring 2.2 and the lower sealing ring 2.2 of the rubber plug 2 forms large interference fit with the inner cavity wall of the outer sleeve 1, the sliding resistance of the syringe is obviously smaller than that of the syringe with the conventional structure, and the sealing performance of the syringe is still good, so that the syringe is very suitable for daily use of vast medical care personnel.
The above-described embodiments are merely exemplary of the present invention, and are not intended to limit the present invention, and any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (6)

1. The utility model provides a low resistance syringe, includes overcoat (1), plug (2) and core bar (3), characterized by: the rubber plug (2) is of a hollow structure provided with an inner cavity, the upper end of the rubber plug (2) is a spherical end surface which is concave downwards, the lower end of the rubber plug (2) is a spherical end surface which is concave upwards, the upper surface and the lower surface of the inner cavity (2.1) of the rubber plug are also spherical surfaces which are respectively consistent with the shapes of the upper spherical end surface and the lower spherical end surface of the outside, the upper edge and the lower edge of the side surface of the rubber plug (2) are respectively provided with a circle of sealing ring (2.2) which is abutted against the inner cavity wall of the outer sleeve (1), and the lower end of the rubber plug (2) is provided with an opening (2.3) communicated with the inner cavity (2.1) of the rubber plug; the top end of the core rod (3) is provided with a clamping joint (3.1), a push plate (3.2) is arranged below the clamping joint (3.1) of the core rod (3), the clamping joint (3.1) is sleeved in the inner cavity (2.1) of the rubber plug, and the push plate (3.2) abuts against the outer edge of the lower spherical end surface of the rubber plug (2); the clamping head (3.1) is a circular plate, a plurality of protruding points (3.3) are arranged on the top surface and the bottom surface of the clamping head, the protruding points (3.3) are evenly distributed along the circle center of the circular plate in a multi-circle mode outwards, the height of the protruding points (3.3) on the two surfaces is gradually increased from the inner circle to the outer circle, and therefore multi-point support is formed on the upper spherical surface and the lower spherical surface of the rubber plug inner cavity (2.1).
2. The syringe of claim 1, wherein: and the sealing rings (2.2) at the upper edge and the lower edge of the side surface of the rubber plug (2) are respectively tangent with the outer edges of the upper spherical end surface and the lower spherical end surface of the rubber plug (2).
3. The syringe of claim 1, wherein: the central angle of the section circular arcs of the upper spherical end surface and the lower spherical end surface of the rubber plug (2) is 5-30 degrees.
4. The syringe of claim 1, wherein: the opening (2.3) at the lower end of the rubber plug (2) adopts a round opening and is provided with a chamfer.
5. The syringe of claim 1, wherein: the opening (2.3) at the lower end of the rubber plug (2) adopts a cross-shaped groove opening.
6. The syringe of claim 1, wherein: the top surface of the outer sleeve (1) is a plane or an inwards concave spherical surface.
CN201610212491.5A 2016-04-07 2016-04-07 Low-resistance syringe Active CN105709310B (en)

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CN105709310B true CN105709310B (en) 2021-12-31

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Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA3091922C (en) * 2018-03-06 2023-02-14 Eric J. Van Voorhees Medical delivery devices having low lubricant hydrophobic syringe barrels
CN108464874A (en) * 2018-03-30 2018-08-31 陶霞霞 A kind of syringe that can be recycled
CN108969845A (en) * 2018-08-08 2018-12-11 四川普瑞斯生物科技有限公司 A kind of novel low-resistance injector

Citations (10)

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Publication number Priority date Publication date Assignee Title
US4354507A (en) * 1978-01-17 1982-10-19 Concord Laboratories Syringe
US5314416A (en) * 1992-06-22 1994-05-24 Sherwood Medical Company Low friction syring assembly
JPH11244381A (en) * 1997-12-24 1999-09-14 Bracco Internatl Bv Lubricating plunger for injector or cartridge/plunger rod assembly
ES2184798T3 (en) * 1994-05-06 2003-04-16 Amersham Health As SYRINGE OF LOW RESISTANCE.
CN202605444U (en) * 2012-03-30 2012-12-19 杭州龙德医用器械有限公司 Low-resistance piston assembly of syringe
CN202620377U (en) * 2012-05-25 2012-12-26 山东新华安得医疗用品有限公司 Low-resistance injector
CN202761828U (en) * 2012-06-29 2013-03-06 新乡市驼人医疗器械有限公司 Novel low resistance injector
CN204446814U (en) * 2015-01-04 2015-07-08 湖南省绿洲惠康发展有限公司 Single use injection with low resistance
CN104888313A (en) * 2015-06-29 2015-09-09 山东威高集团医用高分子制品股份有限公司 Low-resistance injector
CN205759065U (en) * 2016-04-07 2016-12-07 广西华度医用器材有限公司 A kind of injection with low resistance

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Publication number Priority date Publication date Assignee Title
US8613730B2 (en) * 2008-11-26 2013-12-24 Acist Medical Systems, Inc. Apparatus and methods for fluid pressurizing units of injection systems

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4354507A (en) * 1978-01-17 1982-10-19 Concord Laboratories Syringe
US5314416A (en) * 1992-06-22 1994-05-24 Sherwood Medical Company Low friction syring assembly
ES2184798T3 (en) * 1994-05-06 2003-04-16 Amersham Health As SYRINGE OF LOW RESISTANCE.
JPH11244381A (en) * 1997-12-24 1999-09-14 Bracco Internatl Bv Lubricating plunger for injector or cartridge/plunger rod assembly
CN202605444U (en) * 2012-03-30 2012-12-19 杭州龙德医用器械有限公司 Low-resistance piston assembly of syringe
CN202620377U (en) * 2012-05-25 2012-12-26 山东新华安得医疗用品有限公司 Low-resistance injector
CN202761828U (en) * 2012-06-29 2013-03-06 新乡市驼人医疗器械有限公司 Novel low resistance injector
CN204446814U (en) * 2015-01-04 2015-07-08 湖南省绿洲惠康发展有限公司 Single use injection with low resistance
CN104888313A (en) * 2015-06-29 2015-09-09 山东威高集团医用高分子制品股份有限公司 Low-resistance injector
CN205759065U (en) * 2016-04-07 2016-12-07 广西华度医用器材有限公司 A kind of injection with low resistance

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