CN208660058U - Needleless injector, needleless injector pencil and its piston rod - Google Patents
Needleless injector, needleless injector pencil and its piston rod Download PDFInfo
- Publication number
- CN208660058U CN208660058U CN201721543495.8U CN201721543495U CN208660058U CN 208660058 U CN208660058 U CN 208660058U CN 201721543495 U CN201721543495 U CN 201721543495U CN 208660058 U CN208660058 U CN 208660058U
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- CN
- China
- Prior art keywords
- piston rod
- needleless injector
- main part
- face
- flange portion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
Links
- 238000000034 method Methods 0.000 claims description 12
- 238000002347 injection Methods 0.000 description 18
- 239000007924 injection Substances 0.000 description 18
- 239000003814 drug Substances 0.000 description 16
- 229940079593 drug Drugs 0.000 description 9
- 239000012530 fluid Substances 0.000 description 7
- 239000007788 liquid Substances 0.000 description 5
- 230000006378 damage Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000005489 elastic deformation Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 108010093583 ART123 Proteins 0.000 description 1
- 241000208340 Araliaceae Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000004308 accommodation Effects 0.000 description 1
- 239000003124 biologic agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 238000001727 in vivo Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 206010033675 panniculitis Diseases 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 208000009146 rhinoscleroma Diseases 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 210000004304 subcutaneous tissue Anatomy 0.000 description 1
- 210000001519 tissue Anatomy 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Infusion, Injection, And Reservoir Apparatuses (AREA)
Abstract
The utility model provides a kind of needleless injector, needleless injector pencil and its piston rod.The piston rod includes the interconnecting piece of elongated main part, the piston mounting portion for installing piston, flange portion and the pusher for connecting needleless injector, wherein has elastic portion in the first end face of the close main part of flange portion.Due to being provided with elastic portion, the attachment device with taper and groove on the piston rod of the utility model, solves the problems such as pencil present in existing needleless injector not easy to install, liquor residue, reversed leakage.
Description
Technical field
The utility model relates to needleless injection techniques fields, and in particular, to for needleless injector pencil piston rod,
And needleless injector pencil and needleless injector with the piston rod.
Background technique
With the development of pharmaceuticals industry, many biological agent similar drugs are produced, the characteristics of these drugs is that injection volume is small,
Often injection.There is the syringe of needle that can bring the pain to fear and the needle thorn of needle to user.Needleless injection techniques refer to
Without the help of syringe needle when progress drug injection, but by pressurizeing to liquid medicine, make liquid medicine with ultra-fine, high speed, straight line
The mode of ejection is directly entered the technology of body tissue.The realization of needleless injection techniques relies on needleless injector.
Needleless injector currently on the market is usually passed through external power supply and is pressurizeed using piston rod to liquid drug, and is made
Liquid drug, by very thin micropore, penetrates skin in the form of high-voltage high-speed, enters in vivo.Needleless injector may be used also simultaneously
So that injection drug more tends to disperse, is conducive to the absorption of drug and reduces the infringement to subcutaneous tissue, avoid the formation of scleroma.
But since development time is shorter, still there are many shortcomings for existing needleless injector, especially above-mentioned
Critical component piston rod, there are many problems.Fig. 1 show generally constituting for existing needleless injector 100, and needleless injector is logical
It is often made of pencil 10 and promotion part 20, wherein pencil 10 is made of pencil shell 11, piston rod 12 and piston 13；It pushes
Part 20 is made of pusher shell 21, pusher 22 and compressed spring 23.When being injected with needleless injector, compressed spring 23
Apply thrust to pusher 22, the thrust is passed to piston rod 12 by pusher 22, after 12 stress of piston rod, in pencil shell
Move in body 11, rapidly released medical fluid from pencil shell 11 along longitudinal direction by piston 13, make medical fluid formed jet stream into
Enter in body.
Fig. 2 shows the structures of existing piston rod 12, wherein 121 be piston mounting portion, for installing piston, based on 122
Body portion, 123 be flange portion, and 124 be bayonet unit.
Fig. 3 shows the prior art needleless injector for ideally assembling and finishing, it can be seen that piston rod 12
It is fitted closely between pencil shell 11 and between piston rod 12 and pusher 22, it is very close to each other also not interfere with each other.And
In the actual production process, due to the limitation of manufacturing process, the size of each components all can nothing with the presence of tolerance, after assembling
Can there are gap or interference between some components of needle injection.Usually there are two types of situations, and a kind of situation is the flange of piston rod
The thickness in portion 123 is bigger than normal, this, which will lead to pencil shell 11, can not be completely screwed into pusher 22, and this product is apparent unqualified
Product；Another situation is that the thickness of flange portion 123 is less than normal, this will affect the cooperation between piston rod 12 and pusher 22.Fig. 4
Show the needleless injector piston rod of the prior art 123 thickness of flange portion it is less than normal when the case where, it can be seen that due to method
The thickness in blue portion 123 is insufficient, causes it that cannot be bonded completely between pusher 22, but there are gap A, in Needleless injection
In the injection process of device, due to the impetus of pusher 22, gap A can be transferred to flange portion 123 and pencil shell 11 it
Between, so that the injection stroke of piston 13, which is less than, inhales medicine stroke, so as to cause having liquor residue, detailed process ginseng in front of piston 13
See Fig. 5 A-5C.The most apparent harm of liquor residue is to cause injection dosage inaccurate, followed by causes the waste of medical fluid, and
If residual liquor cannot be discharged in user in time, the influence of other aspects also will cause.
Fig. 2 is returned to, between existing piston rod 12 and pusher 22 is connected by bayonet unit 124, bayonet unit
124 is vertical with the end face of flange portion 123, that is, is parallel to the longitudinal axis of piston rod 12, this to be not easy when installing pencil
Centering, poor to eccentric tolerance, installation action has damage the risk of bayonet unit 124.This is that prior art needleless injector is living
One wretched insufficiency of stopper rod.
Existing needleless injector there is also a deficiency be, needleless injector be applied high-pressure jet principle realize
Injection, in injection process, piston 13 needs to bear higher pressure, after being used for multiple times, 13 reduced performance of piston, meeting
The phenomenon of leakage is generated, the medical fluid for leaking through piston 13 can reversely be come at piston rod, however, internal diameter and work due to pencil shell 11
The diameter of stopper rod 12 differs very little, and space is limited, and the medical fluid leaked through is easy to fill up this segment space, if cannot find in time
And pencil is replaced, medical fluid can travel further into inside needleless injector, corrode internal element, to substantially reduce needleless injector
Service life and safety in utilization.
Therefore, it needs that the improved needleless injector of above-mentioned technical problem can be overcome and for needleless injector pencil
Improved piston rod.
Utility model content
The utility model is directed to the above problems of the prior art, provides a kind of needleless injector, needleless injector
Pencil and its piston rod.
A preferred embodiment according to the present utility model, piston rod include: main part, and main part is to extend longitudinally
Slender member；For installing the piston mounting portion of piston, it is located at the first end of main part；Flange portion is located at main part
The second end opposite with first end, flange portion have close to main part first end face, far from main part second end face with
And the circumferential surface between first end face and second end face；And interconnecting piece, it is located in the second end face of flange portion and is used for
Connect the pusher of needleless injector, wherein there is elastic portion in the first end face of flange portion.
A preferred embodiment according to the present utility model, elastic portion include flange portion first end face upper process simultaneously
In at least one thin-walled protrusion of the circumferential surface upper opening of flange portion.
A preferred embodiment according to the present utility model, elastic portion include one or more elastic components.
A preferred embodiment according to the present utility model, elastic component includes elastic washer, the elastic washer
Shape is selected from: circle, open C shape, saddle type or waveform.
A preferred embodiment according to the present utility model, the elastic washer are selected from rubber washer or spring washer.
A preferred embodiment according to the present utility model, thin-walled protrusion are uniform for the longitudinal axis around piston rod
Multiple thin-walled protrusions of distribution.
The first end face one landform of a preferred embodiment according to the present utility model, elastic washer and flange portion
At.
A preferred embodiment according to the present utility model, interconnecting piece include the card in the second end face of flange portion
Buckle device, bayonet unit have using the longitudinal axis of piston rod as the taper of center line.
A preferred embodiment according to the present utility model, the value of taper is between 0 ° to 30 °.
A preferred embodiment according to the present utility model, the value of taper are 8 °.
A preferred embodiment according to the present utility model, bayonet unit include around piston rod longitudinal axis it is uniform
Multiple buckle structures of distribution, each buckle structure include bar portion and the position that extension is at an angle of relative to the longitudinal axis of piston rod
In the buckle head of bar portion end.
A preferred embodiment according to the present utility model has one or more grooves on the surface of main part.
A preferred embodiment according to the present utility model, multiple grooves extend and surround along the longitudinal axis of piston rod
Longitudinal axis is uniformly distributed.
A preferred embodiment according to the present utility model, groove are selected from: U-lag, V-shaped groove, inverted trapezoidal slot, semicircle
Slot.
A preferred embodiment according to the present utility model, one or more texturearunaperpendiculars are in the longitudinal axis of piston rod
Along the circumferentially extending of main part.
A preferred embodiment according to the present utility model, one or more grooves extend spirally on main part.
On the other hand, the utility model also provides a kind of needleless injector pencil comprising limits piston rod assembly and accommodates
The pencil shell of chamber and the piston rod assembly being slidably located in piston rod assembly accommodating chamber, wherein piston rod assembly includes
According to piston rod described in any of the above embodiment and the piston being connect with the piston mounting portion of piston rod.
Another aspect, the utility model also provide a kind of needleless injector, with needleless injector medicine as described above
Pipe.
Piston rod provided by the utility model and needleless injector with the piston rod, due to being arranged on piston rod
Flexible portion, the attachment device with taper and groove solve pencil present in existing needleless injector and are not easy to pacify
The problems such as dress, liquor residue, reversed leakage.
Detailed description of the invention
Fig. 1 is the sectional view of prior art needleless injector, show needleless injector generally constitute and internal junction
Structure；
Fig. 2 shows the structures of piston rod in prior art needleless injector；
Fig. 3 shows the positional relationship for ideally assembling internal component in the prior art needleless injector finished；
The prior art needleless injector finished is assembled when Fig. 4 shows the flange portion thickness deficiency of actual conditions lower piston rod
The positional relationship of middle internal component；
Fig. 5 A-5C shows suction medicine-injection process of prior art needleless injector shown in Fig. 4；
The partial cutaway that Fig. 6 schematically shows needleless injector according to the present utility model cuts away part injector pencil
With the perspective view of a part of piston and syringe shell, lanced location shows practical according to this inside needleless injector
A kind of improved piston rod of novel preferred embodiment；
Fig. 7 is the improved piston rod shown in Fig. 6 according to a kind of preferred embodiment of the utility model；
Fig. 8 shows the partial enlarged view of piston rod in Fig. 7, shows the structure of flange portion and elastic portion thereon；
Fig. 9 A-9C shows the schematic diagram of the elastic portion of the flange portion according to utility model other embodiments；
Figure 10 A-10C shows several forms of the interconnecting piece of the piston rod according to the utility model embodiment；
Figure 11 A-11B shows the signal of the structure of the groove on the main part according to the utility model other embodiments
Figure.
Specific embodiment
Next, with reference to attached drawing be described in detail the utility model the improved piston rod for needleless injector pencil and
Needleless injector with the piston rod.As described herein is only preferred embodiment according to the present utility model, this
Field technical staff can expect can be realized the other modes of the utility model, institute on the basis of the preferred embodiment
It states other modes and equally falls into the scope of the utility model.
The directional terminology, such as "left", "right" etc. of middle appearance described in detail below refer to the orientation in specific attached drawing.
Fig. 6 is according to the schematic isometric of the needleless injector 200 of the embodiments of the present invention, as shown, nothing
Needle injection 200 includes pencil 30 and pusher 40, includes the piston rod of embodiment according to the present utility model in pencil 30
50.Show for convenience, cutting carried out to the position where piston rod 50 in figure, and be omitted some and the utility model without
The details of pass, for example, skilled person will appreciate that, the shape of pencil 30 and pusher 40 is only schematical, not right
The protection scope of the utility model is construed as limiting.Fig. 7 further illustrates the piston rod 50 in Fig. 6 comprising: main part 52,
It is the slender member extended longitudinally；For installing the piston mounting portion 51 of piston, it is located at the first end (figure of main part 52
Left end shown in 7)；Flange portion 53 is located at the second end opposite with the first end (institute in Fig. 7 of main part 52
The right-hand end shown), flange portion 53 have close to main part 52 first end face, far from main part 52 second end face and
Circumferential surface between first end face and second end face；Interconnecting piece 54 is located in the second end face of flange portion 53 for connecting
Connect the pusher 40 of needleless injector；And wherein, there is elastic portion 531, the elastic portion in the first end face of flange portion 53
531 can generate suitable elastic deformation according to the gap size between piston rod flange portion and pusher 40, between compensation is described
Gap space, fits closely flange portion with pusher.
A preferred embodiment according to the present utility model, elastic portion 531 can be one or more thin-walled protrusions,
As shown in Figure 7 and Figure 8, elastic portion 531 is first end face upper process in flange portion 53 and opens on the circumferential surface of flange portion 53
The thin-walled raised structures of mouth.Since piston rod is generally plastic part, this structure design so that the part can have it is suitable
Elastic deformation amount can compensate well for scale error, can guarantee pencil shell, piston rod and pusher during the installation process
Perfect fitting so that the suction medicine stroke and injection stroke of needleless injector piston rod are of substantially equal, not will cause drug storage space
Significant change, guarantee injection dosage precision.It is contemplated that alternatively, the elastic portion is also possible to
One or more elastic components in the first end face of flange portion are set, also, the elastic component can be individually
It is formed, is also possible to be integrally formed with the first end face of flange portion.The elastic component can be for example shown in Fig. 9 A
Around main part setting elastic washer 531 ' specifically can be rubber washer；It can also be spring pad shown in Fig. 9 B
Circle 531 "；It is also possible to wave washer 531 " shown in Fig. 9 C ', it can also be such as open C shape, the saddle type of other shapes
Deng.Preferably, the multiple thin-walled protrusion or the multiple elastic component are uniformly distributed around the longitudinal axis of piston rod.
It is further preferred that the quantity of the thin-walled protrusion or elastic component is two, certainly, quantity is also possible to three, four
Or more.
A preferred embodiment according to the present utility model, interconnecting piece 54 are separate along the longitudinal axis direction of piston rod
The bayonet unit that the main part extends, the bayonet unit are integrally formed as using the longitudinal axis of piston rod as the cone of center axis
Shape, so that piston rod is easier to be convenient for assembling, and can tolerate biggish installation error with pusher centering when assembling.Institute
The taper α for stating bayonet unit can change in a certain range, be typically in the range of between 0 ° to 30 °, it is preferable that the taper α can
To be 8 °.In a preferred embodiment according to the present utility model, the bayonet unit be can be around the longitudinal axis
The equally distributed two, three, four, or more buckle structure of line, each buckle structure include bar portion 541 and be located at bar portion
The buckle head 542 of 541 end, wherein bar portion 541 angularly extends relative to the longitudinal axis of piston rod with each other
Between form the taper, buckle head 542 is used to engage the pusher 40 of needleless injector.Figure 10 A-10C is shown according to this
The end-view of 54 side of interconnecting piece of the piston rod 50 of the embodiment of utility model, wherein Figure 10 A shows interconnecting piece 54 with two
A buckle structure, Figure 10 B show the tool of interconnecting piece 54 there are three buckle structure, and Figure 10 C shows the tool of interconnecting piece 54, and there are four buckle knots
Structure.
A preferred embodiment according to the present utility model, is provided with the longitudinal axis along piston rod on main part 52
The groove of extension, for accommodating the medical fluid that leaks through from piston in piston failure, prevent the further negative line feed of liquid medicine contamination into
Enter to inside needleless injector, and user is made to be easier to find Drug leakage.The groove can be one or more,
For example, it may be extending along the longitudinal axis and surrounding equally distributed four grooves 521 of the longitudinal axis, Fig. 7 institute
Show visible two grooves therein of angle.It is contemplated that the groove can also be as shown in Figure 11 A perpendicular to piston rod
The annular groove 521 ' of longitudinal axis circumferentially, and as shown in Figure 11 B extended in a manner of coiled coil on main part
Spiral groove 521 ".It should be understood that the groove can also be other forms, as long as the setting of groove can
Meet the requirement of accommodation space while guaranteeing the intensity of piston rod, for example, the shape of groove can be U-shaped, V-arrangement, the ladder that falls
The other shapes such as shape and semicircle.
On the other hand, the utility model also provides a kind of improved needleless injector pencil comprising pencil shell and work
Stopper rod component, wherein the inside of pencil shell defines piston rod assembly accommodating chamber, and piston rod assembly slidably holds
It is contained in piston rod assembly accommodating chamber, and wherein, piston rod assembly includes above-described piston rod and the work with piston rod
Fill in the piston of mounting portion connection.
Further, the utility model also provides a kind of improved needleless injector, infuses with needleless as described above
Emitter pencil.
The protection scope of the utility model is only defined by the claims.Have benefited from the introduction of the utility model, this field skill
Art personnel will readily recognize that can using the alternative structure of structure disclosed in the utility model as feasible alternate embodiments, and
Embodiment disclosed in the utility model can be combined to generate new embodiment, they equally fall into appended right
In the range of claim.
Claims (18)
1. a kind of piston rod for needleless injector, which is characterized in that the piston rod includes:
Main part, the main part are the slender member extended longitudinally；
For installing the piston mounting portion of piston, it is located at the first end of the main part；
Flange portion, is located at the second end opposite with the first end of the main part, and the flange portion has close to described
The first end face of main part, the second end face far from the main part and the circumferential direction between first end face and second end face
Face；And
Interconnecting piece is located at for connecting the pusher of needleless injector in the second end face of the flange portion,
Wherein, there is elastic portion in the first end face of the flange portion.
2. piston rod according to claim 1, which is characterized in that the elastic portion includes the first end in the flange portion
Face upper process and at least one thin-walled protrusion in the circumferential surface upper opening of the flange portion.
3. piston rod according to claim 1, which is characterized in that the elastic portion includes one or more elastic components.
4. piston rod according to claim 3, which is characterized in that the elastic component includes elastic washer, the elasticity
The shape of washer is selected from: circle, open C shape, saddle type or waveform.
5. piston rod according to claim 4, which is characterized in that the elastic washer is selected from rubber washer or spring pad
Circle.
6. piston rod according to claim 2, which is characterized in that the thin-walled protrusion is the longitudinal axis around piston rod
The equally distributed multiple thin-walled protrusions of line.
7. piston rod according to claim 5, which is characterized in that the first end face of the elastic washer and the flange portion
It is integrally formed.
8. piston rod according to claim 1, which is characterized in that the interconnecting piece includes positioned at the second of the flange portion
Bayonet unit on end face, the bayonet unit have using the longitudinal axis of piston rod as the taper of center line.
9. piston rod according to claim 8, which is characterized in that range of the value of the taper between 0 ° to 30 °
It is interior.
10. piston rod according to claim 9, which is characterized in that the value of the taper is 8 °.
11. piston rod according to claim 10, which is characterized in that the bayonet unit includes around the longitudinal direction of piston rod
The equally distributed multiple buckle structures of axis, each buckle structure include the angled extension of longitudinal axis relative to piston rod
Bar portion and buckle head positioned at bar portion end.
12. piston rod described in any claim in -11 according to claim 1, which is characterized in that the surface of the main part
It is upper that there are one or more grooves.
13. piston rod according to claim 12, which is characterized in that the multiple groove prolongs along the longitudinal axis of piston rod
It stretches and surrounds the longitudinal axis and be uniformly distributed.
14. piston rod according to claim 13, which is characterized in that the groove is selected from: U-lag, V-shaped groove, inverted trapezoidal
Slot, semi-circular groove.
15. piston rod according to claim 12, which is characterized in that one or more of texturearunaperpendiculars are in piston rod
Circumferentially extending of the longitudinal axis along the main part.
16. piston rod according to claim 12, which is characterized in that one or more of grooves are on the main part
It extends spirally.
17. a kind of needleless injector pencil, which is characterized in that the needleless injector pencil includes:
Pencil shell limits piston rod assembly accommodating chamber；
Piston rod assembly is slidably located in the piston rod assembly accommodating chamber；
Wherein, the piston rod assembly include according to claim 1 in -16 piston rod described in any claim and with it is described
The piston of the piston mounting portion connection of piston rod.
18. a kind of needleless injector, which is characterized in that the needleless injector is infused with needleless according to claim 17
Emitter pencil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721543495.8U CN208660058U (en) | 2017-11-17 | 2017-11-17 | Needleless injector, needleless injector pencil and its piston rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721543495.8U CN208660058U (en) | 2017-11-17 | 2017-11-17 | Needleless injector, needleless injector pencil and its piston rod |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208660058U true CN208660058U (en) | 2019-03-29 |
Family
ID=65818952
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721543495.8U Withdrawn - After Issue CN208660058U (en) | 2017-11-17 | 2017-11-17 | Needleless injector, needleless injector pencil and its piston rod |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208660058U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
-
2017
- 2017-11-17 CN CN201721543495.8U patent/CN208660058U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN107812281B (en) * | 2017-11-17 | 2024-04-02 | 北京快舒尔医疗技术有限公司 | Needleless injector, needleless injector medicine tube and piston rod thereof |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20190329 Effective date of abandoning: 20240402 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20190329 Effective date of abandoning: 20240402 |
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| AV01 | Patent right actively abandoned |