CN106110443B - Syringe - Google Patents

Syringe Download PDF

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Publication number
CN106110443B
CN106110443B CN201610573126.7A CN201610573126A CN106110443B CN 106110443 B CN106110443 B CN 106110443B CN 201610573126 A CN201610573126 A CN 201610573126A CN 106110443 B CN106110443 B CN 106110443B
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CN
China
Prior art keywords
push rod
sleeve
adjusting
dose
shell
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Active
Application number
CN201610573126.7A
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Chinese (zh)
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CN106110443A (en
Inventor
楚耀强
周伟
刘鹏
叶芊
林林
周子航
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Kunshan Haerxi Medical Devices Co ltd
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Kunshan Haerxi Medical Devices Co ltd
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Publication date
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Priority to CN201610573126.7A priority Critical patent/CN106110443B/en
Publication of CN106110443A publication Critical patent/CN106110443A/en
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Publication of CN106110443B publication Critical patent/CN106110443B/en
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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
    • A61M5/315—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
    • 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
    • A61M5/31533—Dosing mechanisms, i.e. setting a dose
    • 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
    • A61M5/31533—Dosing mechanisms, i.e. setting a dose
    • A61M5/31545—Setting modes for dosing
    • A61M5/31548—Mechanically operated dose setting member
    • A61M5/3155—Mechanically operated dose setting member by rotational movement of dose setting member, e.g. during setting or filling of a syringe
    • 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
    • A61M5/31565—Administration mechanisms, i.e. constructional features, modes of administering a dose
    • A61M5/31576—Constructional features or modes of drive mechanisms for piston rods
    • A61M5/31578—Constructional features or modes of drive mechanisms for piston rods based on axial translation, i.e. components directly operatively associated and axially moved with plunger rod
    • A61M5/3158—Constructional features or modes of drive mechanisms for piston rods based on axial translation, i.e. components directly operatively associated and axially moved with plunger rod performed by axially moving actuator operated by user, e.g. an injection button
    • 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
    • A61M2202/00—Special media to be introduced, removed or treated
    • A61M2202/04—Liquids
    • 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
    • A61M2205/00—General characteristics of the apparatus
    • A61M2205/19—Constructional features of carpules, syringes or blisters

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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 an injector, which comprises a shell, wherein one end of the shell is an injection end connected with a medicament barrel, and the other end of the shell is an adjusting end for adjusting injection dosage; the inner wall of the shell is provided with a scale ring, the outer surface of the scale ring is provided with medicament scale marks, and the outer surface of the scale ring is in threaded connection with the inner wall of the shell; an adjusting knob is further mounted at one end of the shell and fixedly connected with the scale ring, and when the adjusting knob is rotated, the scale ring can be driven to rotate; the dose adjusting sleeve penetrates through the shell, one end of the dose adjusting sleeve is connected with the adjusting knob, and the dose adjusting sleeve can be driven to rotate when the adjusting knob is rotated; one end of the push rod penetrates through the dose adjusting sleeve, the other end of the push rod extends out of the injection end of the shell, and the outer edge of the push rod is in threaded connection with the dose adjusting sleeve; the injection end of the shell is also provided with a reset rotation-stopping sleeve for limiting the rotation of the push rod; an injection button is mounted on the adjustment end of the housing and is adapted to push the dose sleeve towards the injection end when the injection button is depressed.

Description

Syringe
Technical Field
The invention relates to the field of medical instruments, in particular to an injector.
Background
For diabetics, their glycemic index is important, requiring regular attention and recording, and in order to reduce fluctuations in their glycemic index, drug control is required. Artificial insulin is a well-known hypoglycemic agent which must be administered parenterally to function in the human body; currently, the most common way to administer artificial insulin to diabetic patients is by subcutaneous injection.
At present, a disposable or fixed-dose syringe is mostly used for subcutaneous injection, but the patient has many inconveniences in use because the required injection dose depends on the blood sugar index;
of course, syringes capable of adjusting the dose are also available on the market, but the problems of complicated operation, poor accuracy or excessive manufacturing cost exist.
Disclosure of Invention
In view of this, the embodiments of the present invention are expected to provide a syringe, which can accurately adjust the injection dosage, and is convenient to use and low in cost.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the embodiment of the invention provides an injector, which comprises a shell, a scale ring, an adjusting knob, a dose adjusting sleeve, a push rod and an injection button, wherein the scale ring is arranged on the shell; wherein, the first and the second end of the pipe are connected with each other,
one end of the shell is an injection end connected with the medicament barrel, and the other end of the shell is an adjusting end for adjusting injection dosage;
the outer surface of the scale ring is provided with medicament scale marks, the scale ring is arranged on the inner wall of the shell, and the outer surface of the scale ring is in threaded connection with the inner wall of the shell;
the adjusting knob is arranged at the adjusting end of the shell and is fixedly connected with the scale ring, and the scale ring rotates along with the rotation of the adjusting knob;
the dose adjusting sleeve is arranged in the shell in a penetrating way, one end of the dose adjusting sleeve is connected with the adjusting knob, and the dose adjusting sleeve rotates along with the rotation of the adjusting knob;
one end of the push rod penetrates through the dose adjusting sleeve, the other end of the push rod extends out of the injection end of the shell, and the outer edge of the push rod is in threaded connection with the dose adjusting sleeve; the injection end of the shell is also provided with a reset rotation stopping sleeve for limiting the rotation of the push rod;
the injection button is mounted at an adjustment end of the housing, and the dose dial sleeve moves towards the injection end in response to depression of the injection button.
Preferably, the injection end of the housing is provided with a baffle ring for controlling the injected dose, the outer edge of the baffle ring is fixed at a preset position of the inner wall of the housing, and the inner hole of the baffle ring is smaller than the outer edge of the dose adjusting sleeve.
Preferably, one end of the dose adjusting sleeve is provided with a first end face gear, the adjusting knob is provided with a second end face gear matched with the first end face gear, and the adjusting knob drives the dose adjusting sleeve to rotate through the first end face gear and the second end face gear.
Preferably, the dose adjusting sleeve is provided with an elastic component which enables the first face gear and the second face gear to keep a meshed state.
Preferably, the dose adjusting sleeve comprises a push rod nut and an adjusting sleeve, and the push rod nut is provided with an internal thread matched with the push rod; the adjusting sleeve is sleeved on the push rod nut and drives the push rod nut to rotate; the adjusting sleeve penetrates through the inner wall of the scale ring, and one end of the adjusting sleeve is provided with the first face gear.
Preferably, the dose adjusting sleeve further comprises a boosting limiting ring, the boosting limiting ring comprises a fixed end fixed on the push rod nut and a limiting end extending into the adjusting sleeve, and the limiting end is provided with an elastic flange for limiting the axial moving distance of the adjusting sleeve.
Preferably, the inner hole of the baffle ring is axially divided into a first cavity and a second cavity, the diameters of the first cavity and the second cavity are different, the diameter of the first cavity is larger than the preset value of the outer edge diameter of the push rod nut, and the diameter of the second cavity is smaller than the preset value of the outer edge diameter of the push rod nut and larger than the preset value of the outer edge diameter of the push rod.
Preferably, the axial of the reset rotation stopping sleeve is provided with a rotation stopping hole, the circumference of the push rod is provided with at least one flat potential surface penetrating the whole length, and the cross section shape of the rotation stopping hole is adapted to the push rod.
Preferably, one end of the reset rotation stopping sleeve is sleeved with one end of the stop ring, a preset number of first stop blocks are uniformly distributed on the inner wall of one end of the reset rotation stopping sleeve in the circumferential direction, a second stop block matched with the first stop blocks is arranged on the outer edge of one end of the stop ring, and the width of the second stop block in the circumferential direction is matched with the distance between every two adjacent first stop blocks.
Preferably, the injection button comprises a cylinder and a brim, the cylinder passes through the inner hole of the adjusting knob and contacts with the end surface of the dose setting sleeve; the diameter of the brim is larger than the inner hole of the adjusting knob.
The injector provided by the embodiment of the invention comprises a shell, wherein one end of the shell is an injection end connected with a medicament barrel, and the other end of the shell is an adjusting end for adjusting the injection dosage; the inner wall of the shell is provided with a scale ring, the outer surface of the scale ring is provided with medicament scale marks, and the outer surface of the scale ring is in threaded connection with the inner wall of the shell; an adjusting knob is further mounted at one end of the shell and fixedly connected with the scale ring, and when the adjusting knob is rotated, the scale ring can be driven to rotate; the dose adjusting sleeve is arranged in the shell in a penetrating way, one end of the dose adjusting sleeve is connected with the adjusting knob, and when the adjusting knob is rotated, the dose adjusting sleeve can be driven to rotate; one end of the push rod penetrates through the dose adjusting sleeve, the other end of the push rod extends out of the injection end of the shell, and the outer edge of the push rod is in threaded connection with the dose adjusting sleeve; the injection end of the shell is also provided with a reset rotation-stopping sleeve for limiting the rotation of the push rod; an injection button mounted at the adjustment end of the housing, the injection button being capable of pushing the dose dial sleeve towards the injection end when pressed; therefore, the injector in the embodiment of the invention drives the dose adjusting sleeve, the push rod, the shell and the scale ring to perform spiral motion through the adjustment of the adjusting knob, can accurately adjust the injection dose, is convenient to use, adopts a mechanical structure completely, does not need an electronic control part, and has low cost.
Drawings
FIG. 1 is a schematic cross-sectional view of an injector according to an embodiment of the present invention;
FIG. 2 is a schematic perspective view of a syringe according to an embodiment of the present invention;
FIG. 3 is a schematic view of a syringe of an embodiment of the present invention with the dose sleeve and pushrod removed;
FIG. 4 is a schematic cross-sectional view of a combination dose sleeve and plunger in an injector according to an embodiment of the present invention;
FIG. 5 is a schematic view of an adjustment knob in an injector according to an embodiment of the present invention;
FIG. 6 is a schematic view of an adjustment sleeve in a syringe according to an embodiment of the present invention;
FIG. 7 is a schematic view of a ram nut in an injector according to an embodiment of the present invention;
FIG. 8 is a schematic view of a pushrod in an injector according to an embodiment of the present invention;
FIG. 9 is a schematic view of a reset stop rotation sleeve in an injector according to an embodiment of the present invention;
FIG. 10 is a schematic view of a stop ring in a syringe according to an embodiment of the present invention;
fig. 11 is an orthographic view of an end of a dose sleeve in an injector according to an embodiment of the present invention.
Detailed Description
An injector in an embodiment of the present invention comprises: the device comprises a shell, a scale ring, an adjusting knob, a dose adjusting sleeve, a push rod and an injection button; wherein, one end of the shell is an injection end connected with the medicament barrel, and the other end of the shell is an adjusting end for adjusting the injection dosage; the outer surface of the scale ring is provided with medicament scale marks and is arranged on the inner wall of the shell, and the outer surface of the scale ring is in threaded connection with the inner wall of the shell; the adjusting knob is arranged at the adjusting end of the shell and is fixedly connected with the scale ring, and when the adjusting knob is rotated, the scale ring can be driven to rotate; the dose adjusting sleeve is arranged in the shell in a penetrating manner, one end of the dose adjusting sleeve is connected with the adjusting knob, and the dose adjusting sleeve can be driven to rotate when the adjusting knob is rotated; one end of the push rod penetrates through the dose adjusting sleeve, the other end of the push rod extends out of the injection end of the shell, and the outer edge of the push rod is in threaded connection with the dose adjusting sleeve; the injection end of the shell is also provided with a reset rotation stopping sleeve for limiting the rotation of the push rod; the injection button is mounted at the adjustment end of the housing and when pressed, urges the dose dial sleeve towards the injection end.
The working process of the embodiment of the invention comprises the steps of installing the medicament cylinder, adjusting the injection dosage, injecting and resetting, and the specific working principle is as follows:
1) the medicament cartridge is installed and can be integrated, namely a medicament bin and a medicament bottle which are fixed with the shell of the injector are integrated and can be directly installed, and the medicament cartridge is directly discarded after injection and is disposable; the medicine can be split, namely, the medicine bin is firstly arranged, then the medicine bottle is arranged, after the injection, the medicine bottle is discarded, and the medicine bin can be repeatedly used; the medicament cartridge is loaded from the injection end of the shell, and extrudes the reset rotation stopping sleeve to ensure that the reset rotation stopping sleeve cannot rotate, and the specific implementation mode is shown in the application embodiment given below;
2) adjust injection dose, rotate adjust knob, make adjust knob to the regulation end spiral shell of shell rises, adjust knob's rotation can drive the adjustment dose cover and rotate, because the adjustment dose cover is threaded connection with the push rod, but the rotation of push rod is reset and is only changeed the cover restriction, and the head of push rod has withstood the piston of medicament section of thick bamboo, and the resistance is great, can't be to injection end axial displacement, promptly: the dose adjusting sleeve cannot rotate or move, so that the dose adjusting sleeve can spirally rise towards the direction of the adjusting end of the shell, and a certain distance is generated between one end of the dose adjusting sleeve facing the injection end of the shell and the injection end of the shell along with the spiral rise of the dose adjusting sleeve, and the distance determines the injection dose; meanwhile, the adjusting knob and the scale ring are fixedly connected, so the scale ring can also be screwed up, the moving distance of the scale ring and the moving distance of the dose adjusting sleeve have a certain proportional relation, and the outer wall of the scale ring is provided with medicament scale marks, so that the injected dose can be known through a reading window of the shell;
in order to make the injected dose more accurate, the pitch of the thread of the scale ring is larger than the pitch of the thread of the set dose sleeve, so that the displacement distance of the set dose sleeve is enlarged by the scale ring and the dose scale marks are more accurate.
3) Injecting, wherein the injection button is pressed, the injection button can push the dose adjusting sleeve to move towards the injection end of the shell, the dose adjusting sleeve is in threaded connection with the push rod, and the push rod can be pushed to move until one end, facing the injection end of the shell, of the dose adjusting sleeve props against the shell, so that the set dose is injected; meanwhile, the injection button can extrude the adjusting knob when moving downwards, so that the scale ring is driven to spirally descend, and the scale returns to zero.
Note that: if the medicament cartridge is not completely injected, the reset anti-rotation sleeve cannot rotate, i.e. the medicament cartridge is preferably not detached, which may affect the accuracy of the medicament injection amount.
4) Resetting, namely after the medicine of the medicine barrel is injected, disassembling the medicine barrel, loosening the reset rotation stopping sleeve, manually rotating the push rod to enable the push rod to move towards the adjusting end of the shell and return to the position before injection, generally setting a position stopping part, stopping the push rod when the push rod returns to the position before injection, and preventing the push rod from rotating or moving, and particularly referring to the application embodiment given below;
in addition, to ensure that most cartridges on the market are ready for injection, the push rod needs to be designed long enough so that the dose regulating sleeve is designed with enough cavity to accommodate the push rod.
The embodiment of the invention is mainly used for diabetics, but can be used for other patients as understood by those skilled in the art, and the details are not described herein.
The invention is further illustrated by the following figures and specific application examples.
For simplicity of description, the syringe and its components are described in the orientation shown in fig. 1, i.e., both above and below refer to the top and bottom in fig. 1.
As shown in fig. 1-4, an injector comprises a housing 1, wherein the lower end of the housing 1 is an injection end connected with a medicament cartridge, and the upper end is an adjustment end for adjusting the injection dosage; the inner wall of the shell 1 is provided with a scale ring 2: the outer surface of the scale ring 2 is provided with medicament scale marks, the outer surface of the scale ring 2 is in threaded connection with the inner wall of the shell 1, the outer surface of the scale ring 2 is provided with external threads, and the inner wall of the shell 1 is provided with internal threads;
further, the thread type of the outer surface of the scale ring 2 and the inner wall of the housing 1 is a driving thread, i.e. the thread type is rectangular, trapezoidal or saw-toothed, and the rectangular shape is preferred because the thread type is basically not stressed, so that the driving efficiency is high and the friction force is small.
As shown in fig. 2, an adjusting knob 3 is installed at an adjusting end of the housing 1, the adjusting knob 3 is fixedly connected with the scale ring 2, and when the adjusting knob 3 is rotated, the scale ring 2 can be driven to rotate;
specifically, in an initial state, that is, when the scale ring 2 is at a zero position, the lower end of the scale ring 2 is pressed against the inner bottom surface of the injection end of the housing 1, that is, the adjusting knob 3 can only drive the scale ring 2 to spirally rise upwards;
the injection end of the housing 1 is intended for mounting a medicament cartridge, which is provided with an external thread 12 for mounting the medicament cartridge, which is not shown in the figures for the sake of clarity of presentation.
As shown in fig. 5, the adjusting knob 3 is provided with a clamping groove 32, the scale ring 2 is provided with a clamping pin (not shown in the figure) inserted into the clamping groove, and after the adjusting knob 3 and the scale ring 2 are installed, the adjusting knob and the scale ring are fixed together and move synchronously;
furthermore, 3 clamping grooves 32 are uniformly distributed in the circumferential direction, and three clamping pins are correspondingly arranged, so that the fixing is more reliable, and the torque is easier to transmit;
the outer surface of the adjustment knob is provided with a plurality of types of knurls 33 for increasing the friction force, which are not limited.
As shown in fig. 2, a reading window 11 is arranged on the surface of the housing 1, so that the medicine scale marks on the outer surface of the scale ring 2 can be seen, the medicine scale marks are arranged according to a spiral line, and the scale value is gradually increased from top to bottom;
as shown in fig. 1, a dose adjusting sleeve 4 is further disposed in the inner cavity of the housing 1, the upper end of the dose adjusting sleeve is connected to the adjusting knob 3, and when the adjusting knob 3 is rotated, the dose adjusting sleeve can be driven to rotate.
Specifically, as shown in fig. 4 and 5, a first end face gear 413 is arranged at the upper end of the dose adjusting sleeve, the adjusting knob 3 is provided with a second end face gear 31 matched with the first end face gear 413, and the adjusting knob 3 drives the dose adjusting sleeve to rotate through the meshing of the first end face gear 413 and the second end face gear 31;
specifically, the cross-sectional shapes of the teeth of the first face gear 413 and the second face gear 31 are rectangular or trapezoidal, and for smooth meshing, the outer ends of the teeth of the first face gear 413 and the second face gear 31 are arc-shaped.
Further, in order to keep the first end face gear 413 and the second end face gear 31 at proper pre-pressure and keep a normal meshing state, the regulating agent amount sleeve is provided with an elastic component 44 which keeps the first end face gear 413 and the second end face gear 31 in a meshing state;
specifically, the elastic member 44 may be a compression spring, and the wire diameter, the pitch, and the like of the compression spring may be designed according to a required pre-pressure, so that a relatively accurate pre-pressure value may be obtained.
For ease of manufacture, the dose dial sleeve is not integrally formed but includes a spindle nut 42 and a dial sleeve 41, see fig. 6 and 7;
the adjusting sleeve 41 is sleeved on the push rod nut 42 and can drive the push rod nut 42 to rotate;
specifically, as shown in fig. 6 and 7, a key 421 is disposed on an outer surface of an upper end of the push rod nut 42, a key groove 414 is disposed on an inner wall of the adjusting sleeve 41, and torque is transmitted through cooperation between the key and the key groove, that is, the adjusting sleeve 41 drives the push rod nut 42 to rotate;
furthermore, the key can be a spline, and the spline with 4 keys is adopted in the embodiment, so that the torque transmission is stable, and the processing is relatively convenient;
the adjusting sleeve 41 is arranged on the inner wall of the scale ring 2 in a penetrating manner, and the upper end of the adjusting sleeve is provided with the first face gear 413.
In order to achieve good meshing between the first end face gear 413 and the second end face gear 31, the push rod nut 42 and the adjusting sleeve 41 are not fixed in the axial direction in the present embodiment, and in order to transmit the pushing force of the injection button to the push rod nut 42 and then to the push rod through the adjusting sleeve 41 during injection, a boosting limiting ring 43 is added in the present embodiment, as shown in fig. 4, the boosting limiting ring 43 includes a fixed end fixed on the push rod nut 42 and a limiting end extending into the adjusting sleeve 41;
the adjusting sleeve 41 is provided with a third cavity 411 for accommodating the boosting limit ring 43 and a fourth cavity 412 for accommodating the push rod nut 42, and the third cavity is arranged at the periphery of the fourth cavity and is not communicated with the fourth cavity;
thus, during injection, the injection button pushes the adjusting sleeve 41 to move downward, and the top wall of the third cavity 411 will abut against the limiting end of the boosting limiting ring 43 to push the boosting limiting ring to move downward, so as to push the push rod nut 42 to move downward at the same time.
Further, the boosting limiting ring is sleeved with the elastic component 44, the upper end of the elastic component 44 abuts against the adjusting sleeve 41, an upward elastic force is applied to the adjusting sleeve 41, and the adjusting sleeve 41 is not fixed with the push rod nut 42 and the boosting limiting ring in the axial direction, so that the adjusting sleeve 41 can independently move in the axial direction, and good meshing of the first end face gear 413 and the second end face gear 31 is guaranteed.
The limiting end is provided with an elastic flange 431 for limiting the axial moving distance of the adjusting sleeve 41; the function of the elastic flange is that when the injection dosage is adjusted, the adjusting sleeve 41 moves upwards to a certain position and is blocked by the elastic flange, so that the adjusting sleeve 41 and the scale ring 2 cannot move upwards too much to be separated from the shell 1; the elastic flange is similar to a barb in shape and limits the adjusting sleeve 41, a stop ring matched with the elastic flange is arranged at the bottom of the third cavity, and the stop ring can be integrated with the adjusting sleeve 41 or can be installed afterwards; the resilient flange is somewhat resilient and the head is tapered to facilitate mounting in the third cavity.
As shown in fig. 4, a push rod 5 penetrates through the dose adjusting sleeve, in this embodiment, a push rod 5 penetrates through a push rod nut 42, the upper end of the push rod 5 penetrates through the dose adjusting sleeve, the lower end of the push rod 5 extends out of the injection end of the housing 1, and the outer edge of the push rod 5 is in threaded connection with the dose adjusting sleeve;
further, the thread type of the inner thread of the dose sleeve and the outer thread of the push rod 5 is a transmission thread, i.e. the thread type is rectangular, trapezoidal or zigzag, and for better wear resistance, trapezoidal is preferred, so that the transmission efficiency is higher and the service life is longer.
According to the principle of the present embodiment, the push rod 5 cannot rotate when adjusting the dose, so the injection end of the housing 1 is provided with a reset rotation stop sleeve 6 for limiting the rotation of the push rod 5;
as shown in fig. 8 and 9, the reset rotation-stopping sleeve 6 is provided with a rotation-stopping hole 61 in the axial direction, the circumference of the push rod 5 is provided with at least one flat potential surface 52 penetrating the whole length, and the rest are external thread surfaces 53, the cross section of the rotation-stopping hole is adapted to the push rod 5, so that the push rod 5 cannot rotate as long as the reset rotation-stopping sleeve 6 does not rotate;
furthermore, the number of the flat potential surfaces can be multiple, but too much can reduce the area of the thread surface and is not beneficial to the spiral motion, and the flat potential surfaces are two in the embodiment;
furthermore, the push rod 5 is provided with a push rod head 51, and when the push rod moves upwards in a spiral way during resetting, the push rod head touches the reset rotation stopping sleeve, and the push rod returns to the position before injection to complete resetting; the push rod head is a stop part in principle.
As shown in fig. 3, the injection end of the housing 1 is provided with a stop ring 8 for controlling the injection dosage, and the outer edge of the stop ring 8 is fixed at a predetermined position on the inner wall of the housing 1, so as to prevent the dose sleeve, i.e. the push rod 5, from moving further downwards after the preset injection dosage is completed, i.e. the push rod 5 cannot move downwards when the scale ring 2 is at the zero position;
to provide this function, the inner bore of the stop ring 8 is smaller than the outer edge of the dosing sleeve, so that the lower end of the dosing sleeve cannot pass through the inner bore of the stop ring 8, and the movement stops against the upper end of the stop ring 8, and the injection stops.
Furthermore, in order to limit the rotation of the reset rotation stop sleeve 6, the upper end of the reset rotation stop sleeve is arranged to be sleeved on the lower end of the stop ring 8, a preset number of first stop blocks 62 are uniformly distributed on the inner wall of the reset rotation stop sleeve 6 in the circumferential direction, a second stop block 81 matched with the first stop blocks 62 is arranged on the outer edge of the lower end of the stop ring 8, and the circumferential width of the second stop block is matched with the distance between two adjacent first stop blocks, as shown in fig. 9 and 10 in particular; the inner wall of the reset rotation-stopping sleeve 6 is circumferentially and uniformly provided with a preset number of first stop blocks similar to an internal gear, the outer edge of the lower end of the stop ring 8 is provided with a second stop block similar to an external gear, and the first stop blocks and the second stop blocks are in a similar meshing relationship after being assembled, but are not used for transmission but for stopping rotation; the stopping method is that the injection end of the shell is arranged in a medicament barrel (not shown in the figure), the medicament barrel upwards presses the reset rotation-stopping sleeve 6, the first stop block 62 of the reset rotation-stopping sleeve and the second stop block 81 of the stop ring 8 are engaged, and the stop ring is fixed, so that the reset rotation-stopping sleeve cannot rotate; and the medicament barrel dismantles the back, and the cover that splines resets can move down, and first dog 62 and second dog 81 disengage the meshing, and the cover that splines resets can rotate, just can not hinder when resetting, the spiral motion that upwards of push rod just.
For the convenience of assembly, the outer ends of the first stopper and the second stopper are both formed in a circular arc shape.
Furthermore, the inner hole of the baffle ring 8 is axially divided into a first cavity 83 and a second cavity 84 with different diameters, the diameter of the first cavity is larger than the preset value of the outer edge diameter of the push rod nut 42, and the diameter of the second cavity is smaller than the preset value of the outer edge diameter of the push rod nut 42 and larger than the preset value of the outer edge diameter of the push rod 5;
the diameter of the second cavity is smaller than the predetermined value of the outer diameter of the spindle nut 42, which is used to prevent the dose setting sleeve from moving downwards after the predetermined injection dose has been completed, so that the diameter of the second cavity is as large as possible smaller than the predetermined value of the outer diameter of the spindle nut 42, but cannot affect the penetration of the spindle 5;
the diameter of the first cavity 83 is larger than the preset value of the diameter of the outer edge of the push rod nut 42, and mainly aims to ensure that the radial direction does not shake when the dose adjusting sleeve rotates and moves, namely the lower end of the dose adjusting sleeve can extend into the first cavity of the baffle ring 8, and the gap between the outer edge of the lower end of the dose adjusting sleeve and the first cavity is small, so that the dose adjusting sleeve can rotate and move and cannot shake in the radial direction;
furthermore, an elastic part, such as an elastic steel ball and the like, can be arranged on the outer edge of the lower end of the dosage adjusting sleeve or the inner wall of the first cavity, so that the radial direction can be further ensured not to shake;
furthermore, the inner wall of the first cavity 83 is provided with an inner gear 82 with a triangular cross section, and the lower end of the dose adjusting sleeve is provided with a plurality of triangular bulges matched with the triangular cross section of the inner gear;
specifically, as shown in fig. 11, fig. 11 is an end-face orthographic projection view (viewed from right below) of the dose adjusting sleeve, and as shown in the figure, the lower end of the dose adjusting sleeve comprises triangular protrusions 422, elastic support arms 423 and elastic balance protrusions 424, wherein 4 triangular protrusions are respectively arranged on 2 elastic support arms, 2 elastic balance protrusions are uniformly distributed on the circumference, and 4 triangular protrusions and 2 elastic balance protrusions are uniformly distributed on the circumference from the whole circumference; the technical effect is that the injection device can better ensure that the radial direction does not shake, and can bring obvious intermittent rotation feeling to a patient when the injection dosage is adjusted, namely, the patient can adjust a section of preset dosage, has a caridendenyl feeling on hand and can make a sound, so that the patient can conveniently operate under the condition that the scale marks of the medicament are not visible clearly, and the vision of many diabetics can be greatly reduced; and the structure can not obstruct the axial movement during injection, and ensures the normal movement of the dose adjusting sleeve, namely the normal movement of the push rod 5;
further, on the basis that the elastic support arm 423 has a certain elasticity in structure, the material of the dose adjusting sleeve is preferably a material with large elasticity, which is not described herein again.
An injection button 7 is arranged at the adjusting end of the shell 1, and when the injection button is pressed, the dose adjusting sleeve 4 can be pushed to move towards the injection end;
wherein the injection button 7 comprises a cylinder and a brim, the cylinder can pass through the inner hole of the adjusting knob 3 to press the upper end face of the dose adjusting sleeve; the diameter of the brim is larger than the inner hole of the adjusting knob 3;
specifically, the adjusting knob 3 is provided with a through hole for a cylinder of the injection button to pass through, so that during injection, the cylinder of the injection button passes through the adjusting knob 3 to press the upper end surface of the dose adjusting sleeve, so that the dose adjusting sleeve moves downwards;
in this embodiment, during injection, the cylinder of the injection button presses the upper end face of the adjusting sleeve 41, so that on one hand, the adjusting sleeve 41 moves downward to drive the injection movement of the push rod 5, and on the other hand, the first end face gear 413 of the adjusting sleeve 41 is disengaged from the second end face gear 31 of the adjusting knob 3; thus, as the diameter of the brim of the injection button is larger than the inner hole of the adjusting knob 3, the brim of the injection button extrudes the adjusting knob 3 during injection, so that the adjusting knob 3 and the scale ring 2 make spiral descending movement together, and the scale is reset to zero.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, which is intended to cover any modifications, equivalents, improvements, etc. within the spirit and scope of the present invention.

Claims (8)

1. An injector is characterized by comprising a shell, a scale ring, an adjusting knob, a dose adjusting sleeve, a push rod and an injection button; wherein, the first and the second end of the pipe are connected with each other,
one end of the shell is an injection end connected with the medicament barrel, and the other end of the shell is an adjusting end for adjusting the injection dosage;
the outer surface of the scale ring is provided with medicament scale marks, the scale ring is arranged on the inner wall of the shell, and the outer surface of the scale ring is in threaded connection with the inner wall of the shell;
the adjusting knob is arranged at the adjusting end of the shell and is fixedly connected with the scale ring, and the scale ring rotates along with the rotation of the adjusting knob;
the dose adjusting sleeve is arranged in the shell in a penetrating way, one end of the dose adjusting sleeve is connected with the adjusting knob, and the dose adjusting sleeve rotates along with the rotation of the adjusting knob;
one end of the push rod penetrates through the dose adjusting sleeve, the other end of the push rod extends out of the injection end of the shell, and the outer edge of the push rod is in threaded connection with the dose adjusting sleeve; the injection end of the shell is also provided with a reset rotation stopping sleeve for limiting the push rod to rotate under the state of being connected with the medicament barrel; the reset rotation stopping sleeve can rotate under the state that the reset rotation stopping sleeve is not connected with the medicament barrel, so that the push rod is reset to the position before injection;
the injection button is arranged at the adjusting end of the shell, and the dose adjusting sleeve moves towards the injection end along with the pressing of the injection button;
the dose adjusting sleeve comprises a push rod nut, an adjusting sleeve and a boosting limiting ring, and the push rod nut is provided with an internal thread matched with the push rod; the adjusting sleeve is sleeved on the push rod nut and drives the push rod nut to rotate; the adjusting sleeve is arranged on the inner wall of the scale ring in a penetrating manner;
the boosting limiting ring comprises a fixed end fixed on the push rod nut and a limiting end extending into the adjusting sleeve, and the limiting end is provided with an elastic flange for limiting the axial moving distance of the adjusting sleeve.
2. The syringe of claim 1, wherein the injection end of the housing is provided with a stop ring for controlling the injected dose, the stop ring having an outer edge fixed to a predetermined position on the inner wall of the housing, and an inner hole smaller than the outer edge of the dose dial sleeve.
3. The injector of claim 1, wherein the adjusting sleeve is provided with a first face gear at one end, the adjusting knob is provided with a second face gear matched with the first face gear, and the adjusting knob drives the adjusting sleeve to rotate through the first face gear and the second face gear.
4. The syringe of claim 3 wherein the dose dial sleeve is provided with a resilient member to maintain the first face gear and the second face gear in mesh.
5. The syringe of claim 2, wherein the inner bore of the retainer ring is axially divided into a first cavity and a second cavity, the first cavity having a diameter larger than a preset value of the outer diameter of the push rod nut, and the second cavity having a diameter smaller than the preset value of the outer diameter of the push rod nut and larger than the preset value of the outer diameter of the push rod.
6. The injector of claim 2, wherein the reset anti-rotation sleeve is axially provided with an anti-rotation hole, the circumference of the push rod is provided with at least one flat potential surface which penetrates through the whole length, and the cross section of the anti-rotation hole is adaptive to the shape of the push rod.
7. The syringe of claim 6, wherein one end of the reset rotation-stop sleeve is sleeved on one end of the stop ring, a predetermined number of first stop blocks are uniformly distributed on the inner wall of one end of the reset rotation-stop sleeve in the circumferential direction, a second stop block matched with the first stop blocks is arranged on the outer edge of one end of the stop ring, and the circumferential width of the second stop block is matched with the distance between two adjacent first stop blocks.
8. The syringe of claim 7, wherein the injection button comprises a post and a brim, the post passing through the inner bore of the adjustment knob and contacting an end face of the adjustable dose sleeve; the diameter of the brim is larger than the inner hole of the adjusting knob.
CN201610573126.7A 2016-07-20 2016-07-20 Syringe Active CN106110443B (en)

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CN109078240B (en) * 2018-09-30 2024-05-14 江苏德尔福医疗器械有限公司 Disposable injection pen with dosage feedback device
CN111084918A (en) * 2018-10-24 2020-05-01 群康生技股份有限公司 Syringe with injection dosage adjusting function
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WO2023224584A1 (en) * 2022-05-18 2023-11-23 Bi̇med Tekni̇k Aletler Sanayi̇ Ve Ti̇caret Anoni̇m Şi̇rketi̇ The adjustable-dosage syringe

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