CN214860042U - Low-residue injection needle - Google Patents

Low-residue injection needle Download PDF

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Publication number
CN214860042U
CN214860042U CN202120438477.3U CN202120438477U CN214860042U CN 214860042 U CN214860042 U CN 214860042U CN 202120438477 U CN202120438477 U CN 202120438477U CN 214860042 U CN214860042 U CN 214860042U
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CN
China
Prior art keywords
needle
wall
needle tube
hole section
thin
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Active
Application number
CN202120438477.3U
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Chinese (zh)
Inventor
张洪杰
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Beipu Medical Technology Co ltd
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Beipu Medical Technology 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
    • A61M5/31—Details
    • A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
    • 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
    • A61M5/315—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
    • A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
    • A61M5/34—Constructions for connecting the needle, e.g. to syringe nozzle or needle hub
    • 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
    • A61M2005/31516—Piston or piston-rod constructions, e.g. connection of piston with piston-rod reducing dead-space in the syringe barrel after delivery

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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

A low-residue injection needle comprises a needle seat, a needle cylinder, a sealing piston, a needle tube and a core rod, wherein a thin-wall hole section is additionally arranged at the rear end of a through hole of a needle tube mounting part of the needle seat, so that the corresponding thin-wall hole section part on the side wall of the needle tube mounting part is elastically deformed when being clamped with the inner wall of the front end of a connector, and the tight sealing between the thin-wall hole section part and the inner wall of the front end of the connector is realized; in the injection process, when the sealing piston is pushed forwards by the core rod to be blocked by the inner wall of the needle cylinder, the front part of the sealing piston extends into the joint of the needle cylinder, a gap is reserved between the front end face and the rear end face of the needle tube mounting part of the needle cylinder, liquid medicine directly enters the inner hole of the needle tube from the joint of the needle cylinder, the reduction of the primary residual volume is completed, when the sealing piston is further pushed forwards by the core rod, the front end of the sealing piston makes up the gap and is clamped into the thin-wall hole section of the needle tube mounting part, the reduction of the secondary residual volume is completed, so that excessive liquid medicine is prevented from residing in the inner cavity of the needle cylinder connecting part of the needle cylinder, and the effect that the residual volume is very small is achieved.

Description

Low-residue injection needle
Technical Field
The utility model belongs to the technical field of the syringe, concretely relates to low residual syringe needle.
Background
Most of the injectors on the market are provided with injection needles. Referring to fig. 1, the needle holder 1 of the injection needle includes a needle tube mounting portion 101 and a cylinder connecting portion 102, the needle tube 4 is fixed to the needle tube mounting portion 101, and the cylinder connecting portion 102 is used for connecting to the front end of the cylinder 2. Referring to fig. 2, the joint 201 at the front end of the syringe 2 of the assembled injection needle is inserted into the inner cavity of the syringe connecting part 102 of the syringe 4, when the liquid medicine is injected, the sealing piston 3 is pushed forward into the joint 201 of the syringe 2 by the core rod, the liquid medicine is injected through the syringe 4, at this time, a residual volume a is formed by a space surrounded by the inner cavity of the syringe connecting part 102 of the needle base 1, the front end face of the joint 201 of the syringe 2 and the front end face of the sealing piston 3, and the liquid medicine with a high residual quantity can reside at the position, although the liquid medicine can meet the standard of the injector, the situations of liquid medicine waste and large dosage deviation cannot be avoided. Therefore, the injection needle can not meet the accurate requirement of the injection dosage in the clinical occasion with higher requirement on the residual quantity.
SUMMERY OF THE UTILITY MODEL
To the above problem, the utility model provides a low residual syringe needle.
The purpose of the utility model can be realized by the following technical scheme:
a low-residue injection needle comprises a needle seat, a needle cylinder, a sealing piston, a needle tube and a core rod, wherein the needle seat comprises a needle tube installation part and a needle cylinder connecting part, the needle tube installation part is of a cylindrical structure, the rear part of the needle tube installation part is arranged in an inner cavity of the needle cylinder connecting part, the needle tube installation part is provided with a through hole along the axis, the through hole is divided into a needle tube fixing hole section and a thin-wall hole section which are arranged front and back, the needle tube fixing hole section extends to the rear part of the needle tube installation part and is internally fixed with the needle tube, the thin-wall hole section enables the corresponding part of the side wall of the needle tube installation part to be elastically deformed, and the needle cylinder connecting part is of a cylindrical sleeve body structure, and the front end of the needle tube connecting part is connected between the front part and the rear part of the needle tube installation part; the front end of cylinder forms the joint, connect to insert and join in marriage the inner chamber in the cylinder connecting portion of needle file, and the front end inner wall card of joint is on the rear end outer wall of the needle tubing installation department of needle file for the corresponding thin wall hole section part of needle tubing installation department lateral wall takes place elastic deformation, realizes the sealed between the front end inner wall of joint and the rear end outer wall of the needle tubing installation department of needle file.
Preferably, the needle tube mounting part of the needle stand is in a two-section type cylinder structure with a large front part and a small back part.
Preferably, the aperture of the thin-wall hole section of the through hole of the needle seat is larger than that of the needle tube fixing hole section.
Preferably, the inner cavity of the needle cylinder connecting part of the needle seat and the joint of the needle cylinder are both in a conical shape with a small front part and a large back part.
Preferably, the cross section of the rear end of the joint of the needle cylinder is smaller than that of the needle cylinder, and a transitional conical surface for blocking the sealing piston is arranged between the rear end of the inner hole of the joint and the side wall of the needle cylinder.
Preferably, when the sealing piston is pushed forward by the core rod to be blocked by the inner wall of the needle cylinder, the front part of the sealing piston extends into the joint of the needle cylinder, and a gap is reserved between the front end surface and the rear end surface of the needle tube mounting part of the needle seat. More preferably, when the sealing piston is further pushed forward by the core rod, the front end of the sealing piston makes up the clearance and is clamped into the thin-wall hole section of the needle tube mounting part of the needle seat.
Compared with the prior art, the beneficial effects of the utility model are that: by changing the structure of the needle seat, a thin-wall hole section is additionally arranged at the rear end of the through hole of the needle tube mounting part of the needle seat, so that the corresponding thin-wall hole section part of the side wall of the needle tube mounting part is elastically deformed when being clamped with the inner wall of the front end of the joint, and the tight sealing between the outer wall of the rear end of the needle tube mounting part of the needle seat and the inner wall of the front end of the joint of the needle cylinder is realized; in the injection process, when the sealing piston is pushed forward by the core rod to be blocked by the inner wall of the needle cylinder, the front part of the sealing piston extends into the joint of the needle cylinder, a gap is reserved between the front end face and the rear end face of the needle tube installation part of the needle seat, liquid medicine directly enters the inner hole of the needle tube from the joint of the needle cylinder for injection, the liquid medicine cannot pass through the inner cavity of the needle cylinder connection part of the needle seat, the reduction of the first residual volume is completed, when the sealing piston is further pushed forward by the core rod, the front end of the sealing piston makes up the gap and is clamped into the thin-wall hole section of the needle tube installation part of the needle seat, the reduction of the second residual volume is completed, so that the phenomenon that excessive liquid medicine stays in the inner cavity of the needle cylinder connection part of the needle seat is avoided, and the effect that the residual volume is very small is achieved.
Drawings
FIG. 1 is a schematic view of the structure of an assembled needle hub and needle cannula of the prior art;
FIG. 2 is a schematic representation of the residual volume of a prior art injection needle in use for injection;
FIG. 3 is a schematic structural view of the present invention;
FIG. 4 is a schematic view of the assembled needle hub and needle cannula of the present invention;
FIG. 5 is a schematic view of the present invention showing the first reduction of residual volume during use;
fig. 6 is a schematic view of the present invention for reducing the residual volume for the second time in the using process.
The reference numbers are as follows:
1 needle stand
101 needle tube mounting part
102 syringe connection
103 needle tube fixing hole section
104 thin-walled hole section
105 fastener
2 needle cylinder
201 connector
202 transition taper surface
203 card slot
3 sealing piston
4 needle tube
5 core bar
A residual volume.
Detailed Description
The following detailed description of the embodiments of the present invention will be given with reference to the accompanying drawings to make it clear to those skilled in the art how to practice the invention. While the invention has been described in connection with its preferred embodiments, these embodiments are intended to be illustrative, and not to limit the scope of the invention.
Referring to fig. 3, the low residue injection needle comprises a needle base 1, a needle cylinder 2, a sealing piston 3, a needle tube 4 and a core rod 5, and is mainly different from the prior art in the needle base 1.
Referring to fig. 4, the hub 1 includes a needle tube mounting portion 101 and a needle tube connecting portion 102.
The needle tube mounting part 101 is a two-section cylindrical structure with a large front part and a small back part, and the back part of the needle tube mounting part 101 is arranged in the inner cavity of the needle tube connecting part 102. The needle tube mounting part 101 is provided with a through hole along the axis, and the through hole is divided into a needle tube fixing hole section 103 and a thin-walled hole section 104 arranged in the front-rear direction. The needle tube fixing hole section 103 extends from the front to the rear of the needle tube mounting part 101, the needle tube 4 is fixed in the needle tube fixing hole section 103 by glue, and the needle tube fixing hole section 103 may be a two-section stepped hole with a positioning step at the rear end as shown in the figure, or a through hole (not shown in the figure). The thin-walled hole section 104 is provided at the rear portion of the needle tube mounting portion 101, and the thin-walled hole section 104 may be a tapered hole having a small front portion and a large rear portion as shown in the drawing, and the minimum aperture of the tapered hole is larger than the aperture of the needle tube fixing hole section 103, or may be a straight hole having an aperture larger than the aperture of the needle tube fixing hole section 103, and the thin-walled hole section 104 allows the corresponding portion of the sidewall of the needle tube mounting portion 101 to elastically deform.
The syringe connecting part 102 is a cylindrical sleeve structure, the front end of the syringe connecting part 102 is gradually thinned and transited to the position between the front part and the rear part of the syringe mounting part 101, and the inner cavity of the syringe connecting part 102 is conical with a small front part and a large rear part to form a female luer connector.
Referring to fig. 5, the front end of the syringe 2 is provided with a connector 201 which is conical with a small front and a large rear to form a male luer connector, and the connector 201 is inserted into the inner cavity of the syringe connecting part 102 of the needle holder 1. Wherein, the cross section of the rear end of the joint 201 is smaller than that of the needle cylinder 2, a transition conical surface 202 is arranged between the rear end of the inner hole of the joint 201 and the side wall of the needle cylinder 2, and the transition conical surface 202 is used as a front stop for the sealing piston 3 in the needle cylinder 2; the inner wall of the front end of the joint 201 is clamped on the outer wall of the rear end of the needle tube mounting part 101 of the needle holder 1, so that the corresponding thin-wall hole section 104 of the side wall of the needle tube mounting part 101 is elastically deformed, and the sealing between the inner wall of the front end of the joint 201 and the outer wall of the rear end of the needle tube mounting part 101 of the needle holder 1 is realized.
Referring to fig. 3, the sealing piston 3 is disposed in the cylinder 2 and the rear portion thereof is connected to the front end of the core bar 5 disposed in the cylinder 2.
In addition, the front ends of the syringe connecting part 102 of the needle holder 1 and the syringe 2 may adopt a locking structure (see this embodiment) in which the buckle 105 and the slot 203 are matched, or may adopt a non-locking structure without the buckle and the slot, which are all common standards at home and abroad, and those skilled in the art should know that detailed descriptions of the structures are omitted.
When the low-residue injection needle filled with liquid medicine is used for injection, referring to fig. 5, the core rod 5 is pushed, the core rod 5 drives the sealing piston 3 to move forwards until the sealing piston 3 is blocked by the transitional conical surface 202 of the inner wall of the needle cylinder 2, at the moment, the front part of the sealing piston 3 extends into the joint 201 of the needle cylinder 2, a gap is reserved between the front end surface of the sealing piston 3 and the rear end surface of the needle tube installation part 101 of the needle seat 1, the liquid medicine passes through the through hole of the needle tube 4 and reaches the inner hole of the needle tube 4 for injection, and the reduction of the first residual volume is completed. Referring to fig. 6, the core rod 5 is pushed continuously, the core rod 5 pushes the sealing piston 3, and the sealing piston 3 is pushed continuously forward, at this time, the front end of the sealing piston 3 is clamped into the thin-wall hole section 104 of the needle tube mounting part 101 of the needle holder 1, so that a gap between the front end surface of the sealing piston 3 and the rear end surface of the needle tube mounting part 101 of the needle holder 1 is made up, and the reduction of the residual volume for the second time is completed. Thus, excessive liquid medicine is prevented from staying in the inner cavity of the needle cylinder connecting part 102 of the needle seat 1, and the effect of small residual volume is achieved.
It should be noted that many variations and modifications of the embodiments of the present invention are possible, which are fully described, and are not limited to the specific examples of the above embodiments. The above embodiments are merely illustrative of the present invention and are not intended to limit the present invention. In conclusion, the scope of the present invention should include those changes or substitutions and modifications which are obvious to those of ordinary skill in the art.

Claims (7)

1. A low-residue injection needle comprises a needle seat, a needle cylinder, a sealing piston, a needle tube and a core rod, and is characterized in that the needle seat comprises a needle tube installation part and a needle cylinder connecting part, the needle tube installation part is of a cylindrical structure, the rear part of the needle tube installation part is arranged in an inner cavity of the needle cylinder connecting part, the needle tube installation part is provided with a through hole along the axis, the through hole is divided into a needle tube fixing hole section and a thin-wall hole section which are arranged front and back, the needle tube fixing hole section extends to the rear part of the needle tube installation part and is internally fixed with the needle tube, the thin-wall hole section enables the corresponding part of the side wall of the needle tube installation part to be elastically deformed, and the needle cylinder connecting part is of a cylindrical sleeve structure, and the front end of the needle tube connecting part is connected between the front part and the rear part of the needle tube installation part;
the front end of cylinder forms the joint, connect to insert and join in marriage the inner chamber in the cylinder connecting portion of needle file, and the front end inner wall card of joint is on the rear end outer wall of the needle tubing installation department of needle file for the corresponding thin wall hole section part of needle tubing installation department lateral wall takes place elastic deformation, realizes the sealed between the front end inner wall of joint and the rear end outer wall of the needle tubing installation department of needle file.
2. The low residue injection needle of claim 1 wherein the needle mount of the needle hub is a two-stage cylindrical structure with a larger front portion and a smaller rear portion.
3. The low residue injection needle of claim 1 wherein the diameter of the thin wall section of the through hole of the needle holder is larger than the diameter of the fixed hole section of the needle tube.
4. The low residue injection needle of claim 1 wherein the interior cavity of the barrel connecting portion of the needle holder and the adapter of the barrel are both conical with a smaller front and a larger rear.
5. The low residue injection needle of claim 1 wherein the cross-section of the rear end of the adapter of the barrel is smaller than the cross-section of the barrel, and a transition taper for blocking the sealing piston is provided between the rear end of the bore of the adapter and the sidewall of the barrel.
6. The low residue injection needle of any one of claims 1 to 5 wherein when the sealing plunger is pushed forward by the core rod to be blocked by the inner wall of the syringe, the front part of the sealing plunger extends into the joint of the syringe, and a gap is left between the front end face and the rear end face of the syringe mounting part of the needle holder.
7. The low residue injection needle of claim 6 wherein as the sealing plunger is further advanced by the plunger rod, the forward end of the sealing plunger makes up for the gap and snaps into the thin walled bore section of the needle mount of the needle hub.
CN202120438477.3U 2021-02-11 2021-03-01 Low-residue injection needle Active CN214860042U (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN2021101857248 2021-02-11
CN202110185724 2021-02-11

Publications (1)

Publication Number Publication Date
CN214860042U true CN214860042U (en) 2021-11-26

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Application Number Title Priority Date Filing Date
CN202110224741.8A Pending CN112791269A (en) 2021-02-11 2021-03-01 Low-residue injection needle
CN202120438477.3U Active CN214860042U (en) 2021-02-11 2021-03-01 Low-residue injection needle

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Application Number Title Priority Date Filing Date
CN202110224741.8A Pending CN112791269A (en) 2021-02-11 2021-03-01 Low-residue injection needle

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CN (2) CN112791269A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114748734B (en) * 2022-03-28 2024-06-11 李开雄 Precise filtering injector

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