CN109731184B - Injection pen - Google Patents
Injection pen Download PDFInfo
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- CN109731184B CN109731184B CN201910229409.3A CN201910229409A CN109731184B CN 109731184 B CN109731184 B CN 109731184B CN 201910229409 A CN201910229409 A CN 201910229409A CN 109731184 B CN109731184 B CN 109731184B
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- Prior art keywords
- needle
- sleeve
- hiding
- injection
- spring
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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
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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
-
- 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
- A61M5/3202—Devices for protection of the needle before use, e.g. caps
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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
- A61M5/50—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 having means for preventing re-use, or for indicating if defective, used, tampered with or unsterile
- A61M5/5086—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 having means for preventing re-use, or for indicating if defective, used, tampered with or unsterile for indicating if defective, used, tampered with or unsterile
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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 provides an injection pen, which relates to the technical field of medical instruments and comprises an injection pen tube, a hidden needle protection mechanism and an injection mechanism, wherein the injection mechanism comprises a needle tube and a needle head; the needle hiding protection mechanism comprises a needle hiding elastic component, a needle hiding sleeve and a stopping claw, the needle hiding sleeve is sleeved on the needle head, the first end of the needle hiding sleeve is positioned outside the injection pen tube, and the second end of the needle hiding sleeve is positioned inside the injection pen tube and connected with the needle hiding elastic component; the stopping claw is clamped at one end of the needle tube, which is provided with the needle head; the needle hiding sleeve is provided with an embedding hole matched with the stopping claw, the embedding hole penetrates through the side wall of the needle hiding sleeve, when the second end of the needle hiding sleeve moves towards the interior of the injection pen tube relative to the hidden needle, the elastic assembly is compressed, the stopping claw is clamped into the embedding hole, and the compressed needle hiding elastic assembly is used for enabling the needle hiding sleeve to drive the stopping claw to move towards the exterior of the injection pen tube. The injection pen provided by the invention alleviates the technical problem that whether the injection pen is used or not is difficult to distinguish in the related art.
Description
Technical Field
The invention relates to the technical field of medical instruments, in particular to an injection pen.
Background
The injector is a common medical appliance and is mainly used for injecting liquid medicine or drawing liquid, the injection pen is a kind of injector mainly used for injecting trace amount of medicine, such as insulin and epinephrine, and patients who need to inject insulin or epinephrine generally inject the medicine according to the specified amount and time, and the existing injection pen has the function of accurately injecting the dosage.
The syringe needle exposes in the outside after the use of some injection pens among the correlation technique, easily makes the syringe needle damaged, and the syringe needle of some injection pens protects through protection architecture, and in the injection process, the syringe needle stretches out from protection architecture, and before the use and in using the back syringe needle all automatic recovery to protection architecture, whether the syringe needle all is located the syringe pen in protection architecture and has been difficult to distinguish and has been used.
Disclosure of Invention
The invention aims to provide an injection pen, which is used for relieving the technical problem that whether the injection pen is used or not is difficult to distinguish in the related art.
The present invention provides an injection pen comprising: the injection mechanism comprises a needle tube and a needle head, the needle tube is arranged in the injection pen tube, and the needle head is arranged at one end of the needle tube and is positioned outside the injection pen tube;
the needle hiding protection mechanism comprises a needle hiding elastic component, a needle hiding sleeve and a stopping claw, the needle hiding sleeve is sleeved on the needle head, the first end of the needle hiding sleeve is positioned outside the injection pen tube, and the second end of the needle hiding sleeve is positioned inside the injection pen tube and connected with the needle hiding elastic component; the stopping claw is positioned between the needle head and the needle hiding sleeve and is clamped at one end of the needle tube, which is provided with the needle head;
the hidden needle cover be equipped with stopping jack catch complex inlays the hole, it runs through to inlay the hole hidden needle cover's lateral wall, the stopping jack catch is located the needle tubing with inlay between the hole, the second end of hidden needle cover is relative the syringe needle to during the motion in the injection pen tube, hidden needle elastic component compresses, the stopping jack catch card is gone into inlay the hole, the compression hidden needle elastic component is used for making hidden needle cover drives the stopping jack catch to the motion outside the injection pen tube.
Furthermore, the hidden needle elastic assembly comprises a hidden needle spring and a hidden needle spring sleeve, a first blocking piece is arranged in the injection pen tube, the hidden needle spring sleeve is provided with a first guide piece, the first guide piece penetrates through the first blocking piece and is in sliding fit with the first blocking piece, and the hidden needle sleeve is connected with the hidden needle spring sleeve;
the needle hiding spring is located between the first blocking piece and the needle hiding sleeve and is connected with the first blocking piece and the needle hiding spring sleeve respectively.
Furthermore, the needle hiding sleeve is connected with the needle hiding spring sleeve through a second guide sheet, a second blocking sheet is further arranged in the injection pen tube and located between the needle hiding spring sleeve and the needle hiding sleeve, and the second guide sheet penetrates through the second blocking sheet and is in sliding fit with the second blocking sheet.
Furthermore, the outer wall of the hidden needle spring sleeve is fixedly sleeved with a retaining ring, and the retaining ring is connected with the hidden needle spring and the second guide sheet respectively.
Furthermore, the backstop claw comprises a clamping ring and a plurality of inverted claws, and the inverted claws are distributed at intervals along the circumferential direction of the clamping ring and are fixedly connected with the clamping ring;
the quantity of the embedding holes is equal to the quantity of the inverted claws, and the embedding holes are matched with the inverted claws in a one-to-one correspondence mode.
Furthermore, the injection mechanism also comprises an injection spring, the needle tube comprises a liquid medicine storage tube and a push rod, one end of the push rod is positioned in the liquid medicine storage tube, and the other end of the push rod penetrates through the first blocking piece and is in sliding fit with the first blocking piece; one end of the injection spring is connected with the push rod, and the other end of the injection spring is connected with the first blocking piece;
one side of the first blocking piece, which is far away from the injection spring, is provided with a pre-locking assembly, the pre-locking assembly is used for locking or releasing the push rod, and when the push rod is locked, the injection spring enables the push rod to have a trend of moving towards the direction close to the needle head.
Furthermore, the pre-locking assembly comprises a pre-locking cover and a limiting ball, wherein the pre-locking cover covers one end of the injection pen tube far away from the needle hiding sleeve;
the pre-locking cover is provided with a cylindrical groove matched with the push rod, the push rod can enter and move out of the cylindrical groove, a first limiting hole is formed in the circumferential wall, matched with the cylindrical groove, of the push rod, a second limiting hole is formed in the side wall of the cylindrical groove, the second limiting hole penetrates through the side wall of the cylindrical groove, the first guide piece is in sliding fit with the outer wall of the cylindrical groove, and a third limiting hole is formed in the first guide piece;
when the injection pen is not used, the limiting beads are located in the first limiting hole and the second limiting hole, so that the injection spring is in a compressed state, the needle hiding sleeve pushes the needle hiding spring sleeve to move, and when the third limiting hole is opposite to the second limiting hole, the limiting beads enter the second limiting hole and the third limiting hole to release the push rod.
Furthermore, the injection spring is sleeved on the push rod.
Further, the push rod is of a hollow structure, and the injection spring is arranged in the push rod.
Furthermore, the hidden needle spring sleeve is of a hollow structure, and the push rod penetrates through the hidden needle spring sleeve.
Before the injection pen provided by the invention is used, the stopping claw is positioned in the injection pen tube, and the hidden needle sleeve is sleeved outside the needle head, so that the damage to the needle head is reduced; when the injection pen is used, an injection pen is aligned to an injection part, the needle hiding sleeve is pressed through the injection part and moves towards the inside of the injection pen tube, the elastic component is compressed, the needle head penetrates into the injected part, meanwhile, the stopping claw falls into the embedding hole and generates elastic force outwards, then injection is carried out, in the injection process, the stopping claw is positioned in the embedding hole and prevents the needle hiding sleeve from moving relative to the needle tube and the needle head, the stability in the injection process is improved, unnecessary injury to a user is reduced, the needle head is rapidly pulled out after the injection is finished, the acting force of the injected part on the needle hiding sleeve disappears, under the action of the restoring force of the elastic component, the needle hiding sleeve drives the stopping claw to move towards the outside of the injection pen tube, the needle hiding sleeve is sleeved outside the needle head again, in addition, the stopping claw passes through the embedding hole to be in contact with the end face of the injection pen, whether the injection pen is used or not can be judged by whether the stopping claw is in contact with the end face of the injection pen tube or not.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a cross-sectional view of an injection pen provided in accordance with an embodiment of the present invention in a first state;
FIG. 2 is a cross-sectional view of an injection pen provided in accordance with an embodiment of the present invention in a second state;
FIG. 3 is a cross-sectional view of an injection pen provided in accordance with an embodiment of the present invention in a third state;
FIG. 4 is a schematic structural diagram of a hidden needle spring sleeve of an injection pen according to an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a needle covering of an injection pen according to an embodiment of the present invention;
fig. 6 is a schematic structural view of a stopping claw of an injection pen according to an embodiment of the present invention.
Icon: 100-injection pen tube; 110-a first flap; 120-a second baffle plate; 211-a hidden needle spring; 212-hidden needle spring housing; 213-a first guide tab; 214-a baffle ring; 215-third limiting hole; 220-hidden needle sleeve; 221-embedding holes; 222-a second guide tab; 230-stopping claws; 231-a snap ring; 232-pawl reversing; 311-liquid medicine storage tube; 312-a push rod; 320-a needle head; 330-injection spring; 341-pre-locking cap; 342-a retaining bead.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1 to 3, an injection pen provided by an embodiment of the present invention includes: the injection pen comprises an injection pen tube 100, a hidden needle protection mechanism and an injection mechanism, wherein the injection mechanism comprises a needle tube and a needle head 320, the needle tube is arranged in the injection pen tube 100, and the needle head 320 is arranged at one end of the needle tube and is positioned outside the injection pen tube 100; the hidden needle protection mechanism comprises a hidden needle elastic component, a hidden needle sleeve 220 and a stopping claw 230, the hidden needle sleeve 220 is sleeved on the needle 320, the first end of the hidden needle sleeve 220 is positioned outside the injection pen tube 100, and the second end of the hidden needle sleeve 220 is positioned in the injection pen tube 100 and connected with the hidden needle elastic component; the stopping claw 230 is positioned between the needle 320 and the needle covering sleeve 220 and clamped at one end of the needle tube where the needle 320 is installed; the hidden needle sleeve 220 is provided with an embedding hole 221 matched with the stopping claw 230, the embedding hole 221 penetrates through the side wall of the hidden needle sleeve 220, the stopping claw 230 is located between the needle tube and the embedding hole 221, when the second end of the hidden needle sleeve 220 moves towards the inside of the injection pen tube 100 relative to the needle 320, the hidden needle elastic assembly is compressed, the stopping claw 230 is clamped into the embedding hole 221, and the compressed hidden needle elastic assembly is used for enabling the hidden needle sleeve 220 to drive the stopping claw 230 to move towards the outside of the injection pen tube 100.
Specifically, the injection pen barrel 100 includes a first pen barrel and a second pen barrel, the needle-hiding elastic assembly is disposed in the first pen barrel, the needle tube, the needle-hiding sleeve 220 and the stopping claw 230 are disposed in the second pen barrel, and the first pen barrel and the second pen barrel are connected in a clamping manner and are communicated with each other.
Further, the hidden needle elastic assembly comprises a hidden needle spring 211 and a hidden needle spring sleeve 212, a first blocking piece 110 is arranged in the injection pen tube 100, the hidden needle spring sleeve 212 is provided with a first guide piece 213, the first guide piece 213 penetrates through the first blocking piece 110 and is in sliding fit with the first blocking piece 110, and the hidden needle sleeve 220 is connected with the hidden needle spring sleeve 212; the hidden needle spring 211 is located between the first blocking piece 110 and the hidden needle sleeve 220, and the hidden needle spring 211 is connected with the first blocking piece 110 and the hidden needle spring sleeve 212 respectively.
As shown in fig. 1 to 3, the first blocking piece 110 is fixedly connected to an end portion of the injection pen barrel 100 far from the needle hiding sleeve 220, and a first guide piece 213 is arranged on an end surface of the needle hiding spring sleeve 212 opposite to the first blocking piece 110, as shown in fig. 4, two first guide pieces 213 are arranged on the needle hiding spring sleeve 212, and the sections of the two first guide pieces 213 are arranged oppositely and are both circular; the first blocking piece 110 is provided with two arc-shaped through holes, and the two first guide pieces 213 correspondingly penetrate through the two arc-shaped through holes one to one and are in sliding fit with the first blocking piece 110. The hidden needle spring 211 is sleeved outside the hidden needle spring sleeve 212, the upper end of the hidden needle spring 211 is in contact with the first blocking piece 110, the lower end of the hidden needle spring 211 is connected with the hidden needle spring sleeve 212, and the lower end of the hidden needle spring sleeve 212 is connected with the hidden needle sleeve 220. When the hidden needle sleeve 220 moves towards the inside of the injection pen tube 100, the hidden needle sleeve 220 pushes the hidden needle spring sleeve 212 to move upwards, the hidden needle spring 211 is compressed, and after the acting force of the injected part on the hidden needle sleeve 220 disappears, the hidden needle sleeve 220 drives the stopping claws 230 to move towards the outside of the injection pen tube 100 under the action of the restoring force of the hidden needle spring 211. The arrangement of the hidden needle elastic assembly enables the hidden needle sleeve 220 to automatically drive the stopping claw 230 to move towards the outside of the injection pen tube 100 after injection is completed, and meanwhile, the hidden needle spring 211 is arranged outside the hidden needle spring sleeve 212 to play a role in guiding the hidden needle spring 211, so that the stability of the hidden needle spring 211 during compression and extension is improved.
Further, the needle hiding sleeve 220 is connected with the needle hiding spring sleeve 212 through a second guiding sheet 222, a second baffle 120 is further disposed in the injection pen tube 100, the second baffle 120 is located between the needle hiding spring sleeve 212 and the needle hiding sleeve 220, and the second guiding sheet 222 penetrates through the second baffle 120 and is in sliding fit with the second baffle 120.
Specifically, the second guide piece 120 is arranged between the needle hiding spring sleeve 212 and the needle hiding sleeve 220, the end surface of the needle hiding sleeve 220 opposite to the second guide piece 120 is provided with a second guide piece 222, as shown in fig. 5, the needle hiding sleeve 220 is provided with two second guide pieces 222, the two second guide pieces 222 are arranged oppositely, the cross section of each second guide piece is arc-shaped, the second guide piece 120 is provided with two arc-shaped through holes, the two second guide pieces 222 correspondingly penetrate through the two arc-shaped through holes one by one and are in sliding fit with the second guide piece 120, and the upper ends of the two second guide pieces 222 are connected with the needle hiding spring sleeve 212; the upper end of the needle hiding sleeve 220 is sleeved at the lower end of the needle tube, the outer wall of the needle hiding sleeve 220 is in contact with the inner wall of the injection pen tube 100, and the needle tube is matched with the injection pen tube 100 to guide the needle hiding sleeve 220. The hidden needle sleeve 220 is connected with the hidden needle spring sleeve 212 through the second guide sheet 222, so that the occupied space is reduced while power transmission is realized.
Further, a blocking ring 214 is fixedly sleeved on the outer wall of the hidden needle spring sleeve 212, and the blocking ring 214 is respectively connected with the hidden needle spring 211 and the second guide piece 222.
As shown in fig. 4, the blocking ring 214 is fixedly sleeved at the lower end of the hidden needle spring sleeve 212, the blocking ring 214 is located between the two second guide pieces 222, a groove matched with the blocking ring 214 is formed on the end surface of the two second guide pieces 222 opposite to the blocking ring 214, and the blocking ring 214 is clamped in the groove to realize the connection between the second guide pieces 222 and the blocking ring 214. The hidden needle spring 211 is sleeved outside the hidden needle spring sleeve 212, the upper end surface of the hidden needle spring 211 is in contact with the first blocking piece 110, the lower end surface of the hidden needle spring 211 is in contact with the end surface of the blocking ring 214, and the blocking ring 214 is matched with the first blocking piece 110 to limit the hidden needle spring 211.
Further, the retaining pawl 230 comprises a snap ring 231 and a plurality of inverted pawls 232, wherein the plurality of inverted pawls 232 are distributed at intervals along the circumferential direction of the snap ring 231 and are all fixedly connected with the snap ring 231; the number of the embedding holes 221 is equal to the number of the inverted claws 232, and the embedding holes are matched with the inverted claws 232 in a one-to-one correspondence manner.
In some embodiments, the number of the inverted claws 232 may be three, four, or five, and in this embodiment, the number of the inverted claws 232 is four, as shown in fig. 6, the four inverted claws 232 are uniformly distributed along the circumferential direction of the snap ring 231 and are all fixedly connected with the snap ring 231; the snap ring 231 is sleeved at the position of the needle tube where the needle head 320 is installed, and the inner diameter of the snap ring 231 is smaller than the diameter of the needle tube, so that the snap ring 231 is prevented from moving upwards; the end face of the reverse claw 232 opposite to the needle covering sleeve 220 is provided with a clamping protrusion, and the clamping protrusion is provided with an inclined surface so as to be convenient for the clamping protrusion to enter the embedding hole 221. The inverted claw 232 is made of an elastic material, for example: rubber and PVC, etc.; the inner wall of the hidden needle sleeve 220 is provided with guide grooves with the same number as the inverted claws 232, the extending direction of the guide grooves is the same as the extending direction of the hidden needle sleeve 220, the four inverted claws 232 are in one-to-one sliding fit in the four guide grooves, each guide groove is internally provided with an embedding hole 221, and the embedding holes 221 are positioned at the same cross section position of the hidden needle sleeve 220. When the injection pen is not used, the clamping protrusion is located above the embedding hole 221, the inverted claws 232 are in a compressed state, the hidden needle sleeve 220 moves towards the inside of the injection pen tube 100, the plurality of inverted claws 232 play a role in guiding the movement of the hidden needle sleeve 220, the movement stability of the hidden needle sleeve 220 is improved, the clamping protrusion enters the embedding hole 221 under the action of restoring force when the clamping protrusion is opposite to the embedding hole 221, the clamping protrusion is limited in the embedding hole 221 under the action of the inner wall of the injection pen tube 100, the inverted claws 232 are still in a compressed state, the plurality of inverted claws 232 are matched to prevent the hidden needle sleeve 220 from further moving towards the inside of the injection pen tube 100, and the length of the needle head 320 exposed out of the hidden needle sleeve 220 is controlled, so that the injection depth is controlled; the needle covering sleeve 220 drives the stopping claw 230 to move towards the outside of the injection pen tube 100, and when the embedding hole 221 moves to the outside of the injection pen tube 100, the clamping protrusion extends out of the embedding hole 221 under the action of restoring force and contacts with the end face of the injection pen tube 100, so that the needle covering sleeve 220 is prevented from retracting.
Further, the injection mechanism further comprises an injection spring 330, the needle tube comprises a liquid medicine storage tube 311 and a push rod 312, one end of the push rod 312 is positioned in the liquid medicine storage tube 311, and the other end of the push rod 312 penetrates through the first baffle 110 and is in sliding fit with the first baffle 110; one end of the injection spring 330 is connected with the push rod 312, and the other end is connected with the first baffle 110; the side of the first blocking plate 110 facing away from the injection spring 330 is provided with a pre-locking assembly for locking or releasing the push rod 312, and when the push rod 312 is locked, the injection spring 330 makes the push rod 312 have a tendency to move toward the needle 320.
The liquid medicine storage tube 311 can be set to different diameters to meet different injection requirements, a rubber plug is arranged at one end of the push rod 312, which is located in the liquid medicine storage tube 311, and the push rod 312 pushes liquid medicine through the rubber plug. During injection, the needle covering sleeve 220 moves towards the injection pen tube 100 at the injection site, the needle 320 contacts with the injection site and penetrates into the injection site, the pre-locking assembly releases the push rod 312, and the push rod 312 pushes the liquid medicine to the injection site through the needle 320 under the restoring force of the injection spring 330.
Further, the pre-locking assembly comprises a pre-locking cover 341 and a limiting ball 342, wherein the pre-locking cover 341 covers one end of the injection pen tube 100 far away from the needle hiding sleeve 220; the pre-locking cover 341 has a cylindrical groove matching with the push rod 312, the push rod 312 can enter and move out of the cylindrical groove, the circumferential wall of the push rod 312 matching with the cylindrical groove is provided with a first limit hole, the side wall of the cylindrical groove is provided with a second limit hole, the second limit hole penetrates through the side wall of the cylindrical groove, the first guide sheet 213 is in sliding fit with the outer wall of the cylindrical groove, and the first guide sheet 213 is provided with a third limit hole 215; when the injection pen is not used, the limiting ball 342 is located in the first limiting hole and the second limiting hole, so that the injection spring 330 is in a compressed state, the hidden needle sleeve 220 pushes the hidden needle spring sleeve 212 to move, and when the third limiting hole 215 is opposite to the second limiting hole, the limiting ball 342 enters the second limiting hole and the third limiting hole 215 to release the push rod 312.
As shown in fig. 1 to 3, two first limiting holes are formed in the push rod 312, a connecting line of centers of the two first limiting holes has the same direction as a radial line of the push rod 312, two second limiting holes are formed in a side wall of the cylindrical groove, and axes of the two second limiting holes are overlapped and parallel to the connecting line of the centers of the two first limiting holes; the end parts of the two first guide sheets 213 close to the hidden pin spring housing 212 are respectively provided with a third limiting hole 215, and the axes of the two third limiting holes 215 are overlapped and parallel to the axis of the second limiting hole. As shown in fig. 1, before the injection pen is used, the third position-limiting hole 215 is located below the second position-limiting hole, the two portions of the first guide plate 213 not provided with the third position-limiting hole 215 are opposite to the second position-limiting hole, so as to prevent the position-limiting ball 342 from moving out of the second position-limiting hole, and the position-limiting ball 342 is located in the first position-limiting hole and the second position-limiting hole, so as to limit the downward movement of the push rod 312, thereby enabling the injection spring 330 to be in a compressed state.
When the injection pen is used, the injection site moves the needle hiding sleeve 220 into the injection pen tube 100, the needle 320 penetrates into the injection site, the needle hiding sleeve 220 pushes the needle hiding spring sleeve 212 and the first guide sheet 213 to move towards the direction close to the pre-locking cover 341, the inverted claw 232 enters the embedding hole 221, the needle hiding spring 211 is compressed, as shown in fig. 2, the third limiting hole 215 is opposite to the second limiting hole, the limiting ball 342 enters the second limiting hole and the third limiting hole 215 under the action of the side wall of the first limiting hole, the push rod 312 is automatically released, the push rod 312 pushes the liquid medicine to the injection site through the needle 320 under the action of the restoring force of the injection spring 330, after the injection pen is completed, the injection pen is removed from the injection site, the needle hiding sleeve 220 automatically drives the stopping claw 230 to move towards the outside of the injection pen tube 100 under the action of the restoring force of the needle hiding spring 211, and the embedding hole 221 moves to the outside of the injection pen tube 100, under the action of the restoring force, the clamping protrusion extends out of the embedding hole 221 and contacts with the end face of the injection pen tube 100, so that the needle hiding sleeve 220 is prevented from retracting, and whether the injection pen is used or not can be judged according to whether the clamping protrusion contacts with the end face of the injection pen tube 100 or not.
The needle hiding protection mechanism is matched with the injection structure, a user only needs to make the needle hiding sleeve 220 contact with an injected part and press the injection pen, a series of actions of all parts in the injection pen are automatically injected, after the injection pen is separated from the injected part, the needle hiding sleeve 220 drives the stopping claw 230 to automatically move towards the outside of the injection pen tube 100, the needle hiding sleeve 220 is sleeved outside the needle 320 again, the stopping claw 230 penetrates through the embedding hole 221 to be in contact with the end face of the injection pen tube 100, the needle hiding sleeve 220 is prevented from entering the injection pen tube 100 again to expose the needle 320, and whether the injection pen is used or not can be judged by whether the stopping claw 230 is in contact with the end face of the injection pen tube 100 or not.
In some embodiments, the injection spring 330 is sleeved on the push rod 312. As shown in fig. 1 to 3, an annular protrusion is disposed at a lower end of a circumferential surface of the push rod 312, a lower end of the injection spring 330 contacts with the annular protrusion, an upper end of the injection spring contacts with the first blocking piece 110, and the first blocking piece 110 and the annular protrusion cooperate to limit the needle hiding spring 211.
In other embodiments, the push rod 312 is a hollow structure, and the injection spring 330 is disposed within the push rod 312. Specifically, the push rod 312 is provided with a cylindrical cavity, the lower end of the push rod is closed, the injection spring 330 is located in the cylindrical cavity, the lower end of the injection spring is in contact with the bottom wall of the cylindrical cavity, a limit groove is formed in the side wall of the cylindrical cavity, the limit groove penetrates through the side wall of the cylindrical cavity, the length direction of the limit groove is the same as that of the push rod 312, a limit protrusion is arranged on the first blocking piece 110, the limit protrusion penetrates through the limit groove to be in contact with the upper end of the injection spring 330, and the limit protrusion is matched with the bottom wall of the.
Further, the hidden needle spring housing 212 is a hollow structure, and the push rod 312 penetrates through the hidden needle spring housing 212.
As shown in fig. 1 and 2, the push rod 312 and the injection spring 330 both pass through the needle hiding spring sleeve 212, the injection spring 330 is sleeved on the push rod 312, the upper end of the injection spring 330 contacts with the first blocking piece 110, the lower end contacts with the annular protrusion arranged at the lower end of the push rod 312, and when the upper end of the push rod 312 is limited in the pre-locking cover 341, the injection spring 330 is in a compressed state. The push rod 312 and the injection spring 330 are both arranged in the needle hiding spring sleeve 212, so that the occupied space is reduced, and the volume of the injection pen is reduced.
Before the injection pen provided by the embodiment of the invention is used, the stopping claw 230 is positioned in the injection pen tube 100, and the needle hiding sleeve 220 is sleeved outside the needle 320, so that the needle 320 is prevented from being damaged; when the injection pen is used, an injection pen is aligned to an injection part, the needle hiding sleeve 220 is pressed through the injection part, the needle hiding sleeve 220 moves towards the inside of the injection pen tube 100, the elastic component is compressed, the needle 320 penetrates into the injected part, meanwhile, the stopping claws 230 fall into the embedding holes 221 and generate elastic force outwards, then injection is carried out, in the injection process, the stopping claws 230 are located in the embedding holes 221, the needle hiding sleeve 220 is prevented from moving relative to the needle tube and the needle 320, the stability in the injection process is improved, unnecessary injury to a user is reduced, the needle 320 is rapidly pulled out after the injection is finished, the acting force of the injected part on the needle hiding sleeve 220 disappears, under the restoring force of the elastic component, the needle hiding sleeve 220 drives the stopping claws 230 to move towards the outside of the injection pen tube 100, the needle hiding sleeve 220 is sleeved outside the needle 320 again, in addition, the stopping claws 230 penetrate through the embedding holes 221 to be in contact with the end face of the injection pen tube 100, the needle, further, whether the injection pen is used or not can be judged by whether or not the retaining claw 230 is in contact with the end surface of the injection pen tube 100.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (6)
1. An injection pen, comprising: the injection mechanism comprises a needle tube and a needle head, the needle tube is arranged in the injection pen tube, and the needle head is arranged at one end of the needle tube and is positioned outside the injection pen tube;
the needle hiding protection mechanism comprises a needle hiding elastic component, a needle hiding sleeve and a stopping claw, the needle hiding sleeve is sleeved on the needle head, the first end of the needle hiding sleeve is positioned outside the injection pen tube, and the second end of the needle hiding sleeve is positioned inside the injection pen tube and connected with the needle hiding elastic component; the stopping claw is positioned between the needle head and the needle hiding sleeve and is clamped at one end of the needle tube, which is provided with the needle head;
the needle hiding sleeve is provided with an embedding hole matched with the stopping claw, the embedding hole penetrates through the side wall of the needle hiding sleeve, the stopping claw is positioned between the needle tube and the embedding hole, when the second end of the needle hiding sleeve moves towards the interior of the injection pen tube relative to the needle head, the needle hiding elastic assembly is compressed, the stopping claw is clamped into the embedding hole, and the compressed needle hiding elastic assembly is used for enabling the needle hiding sleeve to drive the stopping claw to move towards the exterior of the injection pen tube;
the needle hiding elastic assembly comprises a needle hiding spring and a needle hiding spring sleeve, a first blocking piece is arranged in the injection pen tube, the needle hiding spring sleeve is provided with a first guide sheet, the first guide sheet penetrates through the first blocking piece and is in sliding fit with the first blocking piece, and the needle hiding sleeve is connected with the needle hiding spring sleeve;
the needle hiding spring is positioned between the first blocking piece and the needle hiding sleeve and is respectively connected with the first blocking piece and the needle hiding spring sleeve; the injection mechanism further comprises an injection spring, the needle tube comprises a liquid medicine storage tube and a push rod, one end of the push rod is located in the liquid medicine storage tube, and the other end of the push rod penetrates through the first blocking piece and is in sliding fit with the first blocking piece; one end of the injection spring is connected with the push rod, and the other end of the injection spring is connected with the first blocking piece;
a pre-locking assembly is arranged on one side, away from the injection spring, of the first blocking piece and used for locking or releasing the push rod, and when the push rod is locked, the injection spring enables the push rod to have a tendency of moving towards the direction close to the needle head; the pre-locking assembly comprises a pre-locking cover and a limiting ball, and the pre-locking cover covers one end of the injection pen tube far away from the needle hiding sleeve;
the pre-locking cover is provided with a cylindrical groove matched with the push rod, the push rod can enter and move out of the cylindrical groove, a first limiting hole is formed in the circumferential wall, matched with the cylindrical groove, of the push rod, a second limiting hole is formed in the side wall of the cylindrical groove, the second limiting hole penetrates through the side wall of the cylindrical groove, the first guide piece is in sliding fit with the outer wall of the cylindrical groove, and a third limiting hole is formed in the first guide piece;
when the injection pen is not used, the limiting ball is positioned in the first limiting hole and the second limiting hole so that the injection spring is in a compressed state, the needle hiding sleeve pushes the needle hiding spring sleeve to move, the third limiting hole is opposite to the second limiting hole, the limiting ball enters the second limiting hole and the third limiting hole to release the push rod, the needle hiding sleeve is connected with the needle hiding spring sleeve through a second guide sheet, a second blocking sheet is further arranged in the injection pen tube and positioned between the needle hiding spring sleeve and the needle hiding sleeve, the second guide sheet penetrates through the second blocking sheet and is in sliding fit with the second blocking sheet, two second guide sheets are arranged on the needle hiding sleeve, the two second guide sheets are oppositely arranged, the cross section of the needle hiding sleeve is in an arc shape, two arc-shaped through holes are formed in the second blocking sheet, and the two second guide sheets penetrate through the two arc-shaped through holes in a one-to-one correspondence manner, and the upper ends of the two second guide sheets are connected with the hidden needle spring sleeve.
2. The injection pen as claimed in claim 1, wherein the outer wall of the needle hiding spring sleeve is fixedly sleeved with a retaining ring, and the retaining ring is connected with the needle hiding spring and the second guide plate respectively.
3. The injection pen as claimed in claim 2, wherein the backstop pawl comprises a snap ring and a plurality of inverted pawls, and the inverted pawls are distributed at intervals along the circumferential direction of the snap ring and are all fixedly connected with the snap ring;
the quantity of the embedding holes is equal to that of the inverted claws, and the embedding holes are matched with the inverted claws in a one-to-one correspondence mode.
4. The injection pen of claim 1, wherein the injection spring is sleeved on the push rod.
5. The injection pen of claim 1, wherein the plunger is hollow and the injection spring is disposed within the plunger.
6. The injection pen of claim 1, wherein the needle hiding spring housing is a hollow structure, and the push rod penetrates through the needle hiding spring housing.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2018104984807 | 2018-05-23 | ||
| CN201810498480.7A CN108434556A (en) | 2018-05-23 | 2018-05-23 | Injection pen |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109731184A CN109731184A (en) | 2019-05-10 |
| CN109731184B true CN109731184B (en) | 2021-06-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810498480.7A Pending CN108434556A (en) | 2018-05-23 | 2018-05-23 | Injection pen |
| CN201910229409.3A Active CN109731184B (en) | 2018-05-23 | 2019-03-25 | Injection pen |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810498480.7A Pending CN108434556A (en) | 2018-05-23 | 2018-05-23 | Injection pen |
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| Country | Link |
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| CN (2) | CN108434556A (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109078242B (en) * | 2018-09-30 | 2024-05-14 | 江苏德尔福医疗器械有限公司 | Injection device for prefilled syringe |
| CN110269978B (en) * | 2019-05-14 | 2020-07-31 | 江苏德尔福医疗器械有限公司 | Injection pen |
| CN110292683B (en) * | 2019-07-31 | 2023-09-22 | 派格生物医药(苏州)有限公司 | Automatic injection pen with passive trigger |
| CN110681004A (en) * | 2019-11-15 | 2020-01-14 | 苏州嘉树医疗科技有限公司 | Automatic injector |
| CN111888580B (en) * | 2020-09-10 | 2022-03-01 | 苏州赛卫生物科技有限公司 | Safety syringe |
| CN113117191A (en) * | 2021-05-13 | 2021-07-16 | 深圳惠迈智能科技有限公司 | Automatic injection pen |
| CN116392673A (en) * | 2022-03-30 | 2023-07-07 | 苏州赛卫生物科技有限公司 | Automatic injection pen |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN108434556A (en) | 2018-08-24 |
| CN109731184A (en) | 2019-05-10 |
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Address after: 215000 unit 601, B7 / F, biomedical industrial park, 218 Xinghu street, Suzhou Industrial Park, Jiangsu Province Applicant after: Parker biomedical (Suzhou) Co.,Ltd. Address before: 215000 unit 601, B7 / F, biomedical industrial park, 218 Xinghu street, Suzhou Industrial Park, Jiangsu Province Applicant before: Paige biomedical (Suzhou) Co.,Ltd. |
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