CN108853648B - Needleless injector locking mechanism and needleless injector - Google Patents
Needleless injector locking mechanism and needleless injector Download PDFInfo
- Publication number
- CN108853648B CN108853648B CN201810911280.XA CN201810911280A CN108853648B CN 108853648 B CN108853648 B CN 108853648B CN 201810911280 A CN201810911280 A CN 201810911280A CN 108853648 B CN108853648 B CN 108853648B
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- locking
- movable shaft
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- diameter
- locking mechanism
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- 230000007246 mechanism Effects 0.000 title claims abstract description 32
- 239000011324 bead Substances 0.000 claims description 13
- 230000007704 transition Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 9
- 239000003814 drug Substances 0.000 description 11
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000007788 liquid Substances 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 210000000078 claw Anatomy 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
-
- 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
- A61M5/30—Syringes for injection by jet action, without needle, e.g. for use with replaceable ampoules or carpules
-
- 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
Landscapes
- Health & Medical Sciences (AREA)
- Vascular Medicine (AREA)
- Engineering & Computer Science (AREA)
- Anesthesiology (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Hematology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Infusion, Injection, And Reservoir Apparatuses (AREA)
Abstract
The invention discloses a needleless injector locking mechanism and a needleless injector, and relates to the technical field of medical appliances. One embodiment of the needleless injector locking mechanism comprises: comprises a sliding block, a movable shaft and a locking piece; the movable shaft is provided with a gear which is meshed with a rotating wheel sleeved outside the piston rod of the injector and provided with a tooth structure on the surface; the sliding block is used for driving the movable shaft to move along the axial direction of the movable shaft; the locking member is configured to limit rotation of the movable shaft when the movable shaft is moved into engagement with the locking member. The embodiment can realize smooth locking of the piston rod, so that the safety and the use effect of the needleless injector are improved.
Description
Technical Field
The invention relates to the technical field of medical equipment, in particular to a needleless injector locking mechanism and a needleless injector.
Background
The needleless injection technology is to drive liquid medicine to directly enter body tissue in a superfine, high-speed and straight-line high-pressure jet mode without the aid of a needle head when medicine injection is carried out, so that a series of problems caused by the fact that the needle head penetrates into the body in the traditional injection are solved. Needleless injection technology is implemented by means of needleless injectors, which mainly consist of a pusher and a cartridge. The medicine tube consists of a medicine tube shell, a piston and a piston rod. The working method is as follows: the pusher applies external force to the piston rod, and after the piston rod is stressed, the liquid medicine is pushed out of the medicine tube shell through the piston to form jet flow and enter the human body.
In the use process of the injector, the medicine taking amount needs to be adjusted by using a rotating wheel, and the rotating wheel is locked after the medicine amount is adjusted, so that the medicine pipe is prevented from entering air or extruding medicine liquid. Fig. 1 and 2 show schematic structural views of a locking mechanism for a needleless injector in a release state and a locking state, wherein a rotating wheel 120 is arranged on a piston rod 130, a slidable tooth block 111 and a sliding block 110 connected with the tooth block 111 are arranged beside the rotating wheel 120, and mutually matched tooth structures are arranged on the inner side of the tooth block 111 and the outer side of the rotating wheel 120; with reference to fig. 1 as an observation view, the sliding block 110 is shifted to drive the tooth block 111 to move rightward, so that the tooth block 111 is meshed with the tooth structure of the rotating wheel 120, thereby realizing locking of the rotating wheel 120.
In the locking mechanism in the prior art, the angle of the tooth structure on the tooth block is fixed, so that the angle of the rotating wheel may need to be finely adjusted to enable the tooth block and the rotating wheel to be meshed; during this fine tuning, the piston may be caused to move inside the cartridge, possibly causing a change in the dosage or air ingress, causing a series of safety problems or affecting the injection effect.
Disclosure of Invention
In view of the above, the embodiment of the invention provides a locking mechanism of a needleless injector and a needleless injector, which can realize smooth locking of a piston rod, thereby improving the safety and the use effect of the needleless injector.
To achieve the above object, according to one aspect of the embodiments of the present invention, there is provided a needleless syringe locking mechanism including a slider, a movable shaft, and a locking member; the movable shaft is provided with a gear which is meshed with a rotating wheel which is arranged on a piston rod of the injector and has a tooth structure on the surface; the sliding block is used for driving the movable shaft to move along the axial direction of the movable shaft; the locking member is configured to limit rotation of the movable shaft when the movable shaft is moved into engagement with the locking member.
In this embodiment, because the gear of loose axle and runner tooth structure remain the meshing all the time, consequently in the in-process of locking the loose axle, can not arouse runner angle's change to realize the smooth locking to the piston rod, promote the security and the result of use of needleless syringe.
Optionally, the movable shaft includes a locking section and a releasing section, and the diameter of the locking section is larger than that of the releasing section; the locking member is configured to secure the locking segment to limit rotation of the moveable shaft when the locking segment is mated with the locking member.
Optionally, the movable shaft comprises at least two locking sections, the locking piece is a unidirectional bearing which corresponds to the locking sections and is coaxially arranged, and the movable shaft is sleeved in the unidirectional bearing; the diameter of the locking section is the same as the inner diameter of the one-way bearings, and at least one-way bearing is reversely arranged with the other one-way bearings.
In this embodiment, at least two oppositely disposed one-way bearings are utilized to limit the rotation of the moveable shaft. Because the unidirectional bearing has a standard inner diameter, the processing of the movable shaft is more convenient compared with other fixing modes; in addition, due to the structural characteristics of the one-way bearing, the locking section can be matched with the one-way bearing easily, so that the operation is smoother.
Optionally, the locking member is at least one loop; the middle part of the ring sleeve is provided with a conical hole, the minimum diameter of the conical hole is not smaller than the diameter of the release section, and the maximum diameter of the conical hole is not larger than the diameter of the locking section; the movable shaft is sleeved in the annular sleeve.
In this embodiment, locking of the movable shaft is achieved by means of a collar provided with a conical hole. The friction force formed by elastic deformation of the ring sleeve and the movable shaft is used for preventing the movable shaft from rotating, so that the requirement on the design size is low, and the processing is easy.
Optionally, a conical transition section is arranged between the locking section and the releasing section. Through setting up the changeover portion, can guarantee that the loose axle moves smoothly, avoid locking section and retaining member to bump and cause the damage, influence locking effect.
Optionally, the locking section is tapered, and a diameter of one end of the locking section, which is close to the locking piece corresponding to the locking section, is smaller than a diameter of the other end of the locking section, which is far away from the locking piece corresponding to the locking section.
Optionally, the locking mechanism further comprises a positioning structure for limiting axial movement of the movable shaft when the locking segment is mated with the locking member. In order to prevent the movable shaft from being separated from the locking mechanism during vibration, the embodiment is further provided with a positioning structure for limiting the axial movement of the movable shaft.
Optionally, the positioning mechanism comprises a positioning bead and a positioning groove matched with the positioning bead in shape; the positioning beads are arranged on the side face of the movable shaft, and the positioning grooves are arranged beside the movement space of the movable shaft; or, the positioning groove is arranged on the side surface of the movable shaft, and the positioning beads are arranged beside the movement space of the movable shaft.
In addition, the invention also provides a needleless injector which comprises the injector locking mechanism in any of the embodiments.
Further effects of the above-described non-conventional alternatives are described below in connection with the embodiments.
Drawings
The drawings are included to provide a better understanding of the invention and are not to be construed as unduly limiting the invention. Wherein:
FIG. 1 is a schematic view of a prior art locking mechanism for a needleless injector in a released state;
FIG. 2 is a schematic view of a prior art locking mechanism for a needleless injector in a locked state;
FIG. 3 is a schematic view showing the structure of the locking mechanism of the needleless injector in the released state according to the first embodiment of the present invention;
FIG. 4 is a schematic view showing a structure of a locking mechanism of a needleless injector in a locked state according to a first embodiment of the present invention;
FIG. 5 is a schematic view of the structure of a movable shaft in a locking mechanism of a needleless injector according to an embodiment of the present invention;
FIG. 6 is a schematic view of a needleless injector locking mechanism provided in a second embodiment of the present invention in a released state;
fig. 7 is a schematic view showing a structure of a locking mechanism of a needleless injector in a locked state according to a second embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, in which various details of the embodiments of the present invention are included to facilitate understanding, and are to be considered merely exemplary. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the invention. Also, descriptions of well-known functions and constructions are omitted in the following description for clarity and conciseness.
First embodiment
In this embodiment, the piston rod is locked by the engagement of the variable diameter movable shaft with a pair of oppositely disposed one-way bearings. FIG. 3 is a schematic view showing the structure of the locking mechanism of the needleless injector in the released state according to the first embodiment of the present invention; fig. 4 is a schematic view showing a structure of a locking mechanism of a needleless injector in a locked state according to a first embodiment of the present invention.
As shown, the needleless injector in the present embodiment includes a slider 210, a movable shaft 220, a first one-way bearing 231, and a second one-way bearing 232. The movable shaft 220 is disposed beside the piston rod 240 and is axially parallel to the rotating wheel 241 fixedly sleeved outside the piston rod 240, and a certain space is reserved in the fixing holes at two ends of the movable shaft 220, so that the movable shaft 220 can axially move along the fixing holes. The movable shaft 220 is provided with a gear 221, the outer surface of the rotating wheel 241 is provided with a tooth structure, and the gear 221 and the rotating wheel 241 always keep a meshed state in the process of the movable shaft 220 reciprocating along the axial direction. The sliding block 210 is provided with a groove 211 for accommodating the gear 221 on one side close to the movable shaft 220, so that when the sliding block 210 moves, the movable shaft 220 is driven to move along the axial direction, and the sliding block 210 does not block the rotation of the movable shaft 220.
Fig. 5 is a schematic view of the structure of the movable shaft in the locking mechanism of the needleless injector according to the embodiment of the present invention. As shown, the movable shaft 220 is a variable diameter shaft that includes two sets of release sections 223 and two sets of locking sections 222, the diameter a of the release sections 223 being smaller than the diameter B of the locking sections 222. A release section 223 and a locking section 222 are arranged adjacently, and a transition section 224 with a variable diameter is arranged between the release section 223 and the locking section 222, so that the diameter of the movable shaft 220 is changed smoothly between the release section 223 and the locking section 222; the release section 223 and the locking section 222 are arranged in the same order, and the gear 221 is arranged between the release section 223 and the locking section 222, so that the movable shaft 220 has a structure of, for example, "release section-locking section-gear-release section-locking section".
The movable shaft 220 is sleeved in the two unidirectional bearings, and the diameter of the locking section 222 is just matched with the inner diameter of the unidirectional bearings; the two unidirectional bearings are reversely arranged, and the distance between the two unidirectional bearings meets the following conditions: as the movable shaft 220 moves in its axial direction, the two locking segments 222 on the movable shaft 220 are either synchronized into two one-way bearings or are disengaged.
In the state shown in fig. 3, the first unidirectional bearing 231 and the second unidirectional bearing 232 are coaxially fixed beside the movable shaft 220, and the two release sections 223 are respectively positioned in the first unidirectional bearing 231 and the second unidirectional bearing 232, and the diameters of the release sections 223 are smaller and cannot be matched with the unidirectional bearings, so that the movable shaft 220 in the state can still freely rotate, and the rotation of the rotating wheel 241 is not limited; the sliding block 210 is shifted rightwards to drive the movable shaft 220 to move rightwards, so that the two locking sections 222 respectively enter the first unidirectional bearing 231 and the second unidirectional bearing 232 and are matched with the first unidirectional bearing 231 and the second unidirectional bearing 232 to rotate to the state shown in fig. 4, and as the directions of the first unidirectional bearing 231 and the second unidirectional bearing 232 are opposite, the movable shaft 220 can be prevented from rotating to any direction by combining the two unidirectional bearings, and the locking function is realized. In addition, the gear 221 is always meshed with the rotating wheel 241 in the moving process of the movable shaft 220, so that the rotating wheel 241 is prevented from additionally rotating during locking, and the accurate dosage of the liquid medicine is ensured, and no air enters.
It should be understood that the number and arrangement of the movable shaft, the first one-way bearing, and the second one-way bearing in the present embodiment are only examples. The same or similar locking effect as the above embodiment can be achieved as long as at least two one-way bearings are provided, at least one of which is opposite to the other one-way bearings, and the movable shaft with a variable diameter is matched with the one-way bearings. In addition, the position of the gear on the movable shaft can also be changed, for example, the gear can also be arranged near two ends of the movable shaft, so long as the gear can ensure that the stable axis can be kept when the movable shaft moves along the axial direction of the movable shaft, and the gear can also be matched with the one-way bearing and can withdraw from the one-way bearing. Therefore, these variations and other variations not mentioned should be included in the scope of the present invention since they have the same design elements and design ideas.
Second embodiment
In the embodiment, the piston rod is locked by the cooperation of the movable shaft with the variable diameter and the annular sleeve. FIG. 6 is a schematic view of a needleless injector locking mechanism provided in a second embodiment of the present invention in a released state; fig. 7 is a schematic view showing a structure of a locking mechanism of a needleless injector in a locked state according to a second embodiment of the present invention.
As shown in the figure, on the basis of the previous embodiment, the present embodiment does not employ the one-way bearings 231 and 232, but replaces them with two rings 233 having tapered holes in the middle; the maximum diameter of the tapered bore in the collar 233 is no greater than the diameter of the locking section 222 of the moveable shaft 220 and the minimum diameter of the tapered bore is no less than the diameter of the release section 223. Thus, as shown in FIG. 5, the moveable shaft 220 is free to rotate when the release section 223 is mated with the collar 233; as shown in fig. 6, when the locking section 222 and the ring cover 233 are engaged, they are deformed by being pressed against each other, and locking is achieved by using elastic force and friction between materials.
Because of the difference in the mating manner, the locking effect of the ring cover 233 on the locking section 222 in the present embodiment is slightly inferior to the locking effect of the unidirectional bearing on the locking section 222 in the first embodiment; under the influence of the strong vibration, the locking section 222 may slip off the collar 233. To solve this problem, in this embodiment, a positioning groove 252 is formed around one locking section 222, and a positioning bead 251 is formed in a tapered hole of the ring 233 corresponding to the locking section 222; when the locking section 222 moves to be matched with the ring sleeve 233, the positioning bead 251 is clamped with the positioning groove 252, so that the movable shaft 220 is prevented from moving axially, the locking section 222 is prevented from easily sliding out of the ring sleeve 233, and locking stability is improved.
In this embodiment, the locking section 222 may be designed with an equal diameter or a variable diameter; when the diameter-variable design is adopted, the contact area between the diameter-variable design and the ring sleeve 233 can be larger, so that a more stable locking effect can be achieved.
In this embodiment, the ring sleeve may be replaced with other structures that apply friction to lock the ring sleeve by using an elastically-shaped direction-changing movable shaft, such as a claw, etc. The release section, the locking section and the loop can also be provided with one group or more than 2 groups. The positioning beads and the positioning grooves can be arranged at other positions, and the positions of the positioning beads and the positioning grooves can be exchanged, namely, the positioning beads are arranged on the movable shaft, and the positioning grooves are formed in the surface of the conical hole. Therefore, these variations and other variations not mentioned should be included in the scope of the present invention since they have the same design elements and design ideas.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives can occur depending upon design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (7)
1. A needleless injector locking mechanism comprising a slider (210), a movable shaft (220) and a locking member; a gear (221) is arranged on the movable shaft (220), and the gear (221) is meshed with a rotating wheel (241) which is arranged on the piston rod (240) of the injector and has a tooth structure on the surface; the sliding block (210) is used for driving the movable shaft (220) to move along the axial direction of the movable shaft; the locking member is configured to limit rotation of the movable shaft (220) when the movable shaft (220) moves into engagement with the locking member;
the movable shaft (220) comprises a locking section (222) and a releasing section (223), wherein the diameter of the locking section (222) is larger than that of the releasing section (223); when the locking segment (222) is mated with the locking member, the locking member is configured to secure the locking segment (222) to limit rotation of the moveable shaft (220);
the movable shaft (220) comprises at least two locking sections (222), the locking piece is a one-way bearing which corresponds to the locking sections (222) and is coaxially arranged, and the movable shaft (220) is sleeved in the one-way bearing; the diameter of the locking section (222) is the same as the inner diameter of the one-way bearings, and at least one-way bearing is arranged opposite to the other one-way bearings.
2. The locking mechanism of claim 1, wherein the locking member is at least one collar (233); the middle part of the ring sleeve (233) is provided with a conical hole, the minimum diameter of the conical hole is not smaller than the diameter of the release section (223), and the maximum diameter of the conical hole is not larger than the diameter of the locking section (222); the movable shaft (220) is sleeved in the ring sleeve (233).
3. Locking mechanism according to claim 1, characterized in that a conical transition section (224) is provided between the locking section (222) and the release section (223).
4. The locking mechanism of claim 1, wherein the locking segment (222) is tapered and a diameter of an end of the locking segment (222) proximate to its corresponding locking member is smaller than a diameter of the other end of the locking segment (222) distal from its corresponding locking member.
5. The locking mechanism of claim 1, further comprising a positioning structure for limiting axial movement of the moveable shaft (220) when the locking segment (222) is mated with the locking member.
6. The locking mechanism of claim 5, wherein the positioning structure comprises a positioning bead (251) and a positioning groove (252) that is form-fit with the positioning bead (251); wherein,
the positioning beads (251) are arranged on the side face of the movable shaft (220), and the positioning grooves (252) are arranged beside a movement space of the movable shaft (220); or,
the positioning groove (252) is formed in the side face of the movable shaft (220), and the positioning beads (251) are arranged beside the movement space of the movable shaft (220).
7. A needleless injector comprising the injector locking mechanism of any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810911280.XA CN108853648B (en) | 2018-08-10 | 2018-08-10 | Needleless injector locking mechanism and needleless injector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810911280.XA CN108853648B (en) | 2018-08-10 | 2018-08-10 | Needleless injector locking mechanism and needleless injector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108853648A CN108853648A (en) | 2018-11-23 |
| CN108853648B true CN108853648B (en) | 2023-11-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810911280.XA Active CN108853648B (en) | 2018-08-10 | 2018-08-10 | Needleless injector locking mechanism and needleless injector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108853648B (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1197679A (en) * | 1996-09-19 | 1998-11-04 | 伊西康公司 | Controlled motion lock for safety catheter |
| KR100779908B1 (en) * | 2006-11-09 | 2007-11-29 | 주식회사 바이오넷 | Piston locking device for flunger pumping system |
| JP2013085911A (en) * | 2011-10-21 | 2013-05-13 | Create Medic Co Ltd | Syringe operating device |
| CN103550848A (en) * | 2013-11-18 | 2014-02-05 | 江西三鑫医疗科技有限公司 | Needle-free syringe |
| CN103732279A (en) * | 2011-08-02 | 2014-04-16 | 医用注射器公司 | Needle-free injection device |
| CN203749949U (en) * | 2014-01-23 | 2014-08-06 | 陆盘中 | Self-destructive disposable syringe |
| CN106219357A (en) * | 2016-07-22 | 2016-12-14 | 山东泰安煤矿机械有限公司 | The rope Locking device of well lifter suspension arrangement is erect for mine |
| CN106823072A (en) * | 2017-02-04 | 2017-06-13 | 王才丰 | The heavy dose of needleless injector that can independently get it filled |
| CN107812281A (en) * | 2017-11-17 | 2018-03-20 | 北京快舒尔医疗技术有限公司 | Needleless injector, needleless injector pencil and its piston rod |
| CN209286376U (en) * | 2018-08-10 | 2019-08-23 | 北京快舒尔医疗技术有限公司 | A kind of needleless injector retaining mechanism and needleless injector |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10737035B2 (en) * | 2013-09-03 | 2020-08-11 | Sanofi | Piston rod for a drug delivery device and drug delivery device comprising a piston rod |
-
2018
- 2018-08-10 CN CN201810911280.XA patent/CN108853648B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1197679A (en) * | 1996-09-19 | 1998-11-04 | 伊西康公司 | Controlled motion lock for safety catheter |
| KR100779908B1 (en) * | 2006-11-09 | 2007-11-29 | 주식회사 바이오넷 | Piston locking device for flunger pumping system |
| CN103732279A (en) * | 2011-08-02 | 2014-04-16 | 医用注射器公司 | Needle-free injection device |
| JP2013085911A (en) * | 2011-10-21 | 2013-05-13 | Create Medic Co Ltd | Syringe operating device |
| CN103550848A (en) * | 2013-11-18 | 2014-02-05 | 江西三鑫医疗科技有限公司 | Needle-free syringe |
| CN203749949U (en) * | 2014-01-23 | 2014-08-06 | 陆盘中 | Self-destructive disposable syringe |
| CN106219357A (en) * | 2016-07-22 | 2016-12-14 | 山东泰安煤矿机械有限公司 | The rope Locking device of well lifter suspension arrangement is erect for mine |
| CN106823072A (en) * | 2017-02-04 | 2017-06-13 | 王才丰 | The heavy dose of needleless injector that can independently get it filled |
| CN107812281A (en) * | 2017-11-17 | 2018-03-20 | 北京快舒尔医疗技术有限公司 | Needleless injector, needleless injector pencil and its piston rod |
| CN209286376U (en) * | 2018-08-10 | 2019-08-23 | 北京快舒尔医疗技术有限公司 | A kind of needleless injector retaining mechanism and needleless injector |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108853648A (en) | 2018-11-23 |
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