Blood taking needle launches control mechanismTechnical field
Blood collecting pen used, in particular to one kind are mounted on this and adopt when the utility model relates to a kind of individuals to itself blood samplingThe ejection control mechanism for launching away blood taking needle in blood pen.
Background technique
Currently, the blood taking needle of personal blood testing, the movement that syringe needle penetrates skin and exits on the market, is all to useIt directly launches, the principle is as follows:
As shown in Figure 1, 2, acupuncture treatment 71 is fixed on needle handle 72, in 72 insertion needle socket 73 of needle handle, and syringe needle socket 73It is mounted on ejection shaft 74, ejection release organ 75 is equipped between syringe needle socket 73 and ejection shaft 74, is set at 74 rear portion of ejection shaftThere is spring 76.After release spring 76, needle handle 72, syringe needle socket 73 and ejection shaft 74 will project forward simultaneously, i.e. three portionsPart synchronizes the movement that the just achievable needle that travels forward pricks skin.
Since the volume of needle handle 72 is larger (in general, its diameter is in 6mm, length is in 20mm), skin (letter is pierced into acupuncture treatment 71Claim needle thorn, similarly hereinafter) and by exited in skin twice movement in all must overcome very big inertia, especially syringe needle socket 73 and needleHandle 72 is limited by structure, is comparatively all the biggish part of mass ratio, and inertia is very big, the speed for affecting needle thorn and exitingDegree.
It is well known that pain intensity when blood sampling, is inversely proportional with syringe needle movement velocity, that is to say, that syringe needle movementSpeed is slower, keenly feels stronger.
Blood taking needle ejection mechanism in the prior art has the disadvantage in that
1) since the inertia of part is larger, the speed when ejection speed of mechanism, that is, syringe needle being enabled to be pierced into skin and exitRelatively slow, blood sampling pain is than stronger.
2) needle handle 72 is manually inserted into syringe needle socket 73 for the convenience of the users, the dress between needle handle 72 and syringe needle socket 73With gap be loose fit, and loose fit can lengthen acupuncture treatment 71 syringe needle in skin histology residence time (i.e. needle pierce and exitHave lag), the pain of blood sampling is increased indirectly.
3) moment returned in movement, the impact force of mechanism (72 part of syringe needle socket 73 and needle handle) is larger, affects depth(the depth of needling adjusting (limit) of this kind of design is that its is required for the cooperations of some plastic parts to the precision of degree limitation (adjustings) mechanismThere are enough gaps, striker combination (including syringe needle) quality is relatively large, this combination is when moving return by release (to limitMechanism transmitting) large energy, then form the accuracy hit vibration and affect depth localization).
4) when voluntarily blood was collected to oneself by user, a hand is needed to hold the shank of blood collecting pen, another hand needsAfter the upper cover of blood collecting pen is pulled up, needle motion just can be carried out, it is very inconvenient to operate.
Utility model content
The technical problem to be solved by the present invention is to provide a kind of one-hand operations, the blood sampling that needle pierces and rate of withdraw is fastNeedle launches control mechanism.
In order to solve the above-mentioned technical problem, the technical solution adopted in the utility model are as follows:
The blood taking needle of the utility model launches control mechanism, including the hollow core shaft containing axially extending bore and is mounted on axial directionStriker device in through-hole, the hollow core shaft divide front axle and rear axle along its axial direction, and the axially extending bore is respectively to be set to front axleThe preceding hole of section and the metapore of rear shaft part, the aperture in preceding hole are greater than the aperture of metapore, are symmetrically arranged on the front periphery wall of rear axleCommunicated with the metapore and to the middle part of the rear axle extend strip through slot, on the periphery wall at the rear portion of the rear axleAlso it is symmetrically arranged with the locked groove that the hollow core shaft rear end face is communicated and extended to the metapore；
The striker device is made of striker, spiral tension spring, driving snap ring, elastic lock and release button, wherein
Striker is by being mounted in the preceding hole and in the pull back device and the trip rod structure that is placed in the metapore of " door " fontAt device of pulling back is fixedly connected with trip rod, and trip rod can shuttle in preceding hole and metapore and carry the device of pulling back and will setAcupuncture treatment in Yu Qiankong is projected and is retracted by the front end face of the hollow core shaft, is equipped in the tail portion of trip rod around trip rod weekThe lock neck slot that wall extends；
Spiral tension spring is set on trip rod, and tail portion is locked on the bar wall for closing on the lock neck slot；
Driving snap ring is constituted by this side ring and to side ring, this side ring is identical as opposite side ring-shaped and structure, card holder thereonIt is inserted into the corresponding through slot and is clamped on the front end of the spiral tension spring, the spiral tension spring can be with the driving snap ring edgeThe through slot moves from the front to the back and is in tensional state；
Elastic lock is that shape is in " M " shape elastic slice, and foot is interior crotch, is placed in the locked groove, the interior crotchEnd elasticity holding in the lock neck slot；
The rounded short column of release button, end is exposed to outside hollow core shaft thereafter, and front end is contradicted in the snap lockThe spine of button, the release button is pressed into hollow core shaft can make the end of the interior crotch be detached from the clamping with the lock neck slotAnd project the trip rod forward under the pulling of spiral tension spring.
The front end face of the locked groove is by preceding sweptback tapered ramp, and it is oblique that the hook portion of the interior crotch is placed in the wedge shapeOn face.
Described side ring and be arc-shaped " E " shape to the shape of side ring, this side ring and surround the peripheral part of side ring canThe annulus being socketed on the rear axle outer wall is constituted, the card holder is the middle transverse part for being somebody's turn to do " E " shape, is equipped with circlip in the end of card holderStructure, the clip spring structure can be installed on the spiral tension spring front end at least one and enclose on helix.
The periphery diameter of the front axle is greater than the periphery diameter of rear axle, and the front end of the through slot is supported to the boundary of front axle and rear axleFace.
The blood taking needle ejection control mechanism of the utility model is the installation striker device in the hollow core shaft with axially extending bore,The striker device includes striker, spiral tension spring, drives snap ring, elastic lock and release button, meanwhile, it is arranged in hollow core shaft and passes throughThrough-hole and lock neck slot, so that user, which only needs singlehanded palmar hand to hold handle, [as installs the blood collecting pen of the hollow core shaftShell (not shown)], thumb pressing release button acupuncture manipulation can be rapidly completed, operate very convenient.Then, be mounted on striker front end pull back device under the action of, and the acupuncture treatment penetrated in skin can quickly be exited.
The utility model can effectively mitigate pain of the patient in blood sampling, and acupuncture treatment can be improved and be pierced into the accurate of depthDegree improves the sensitivity of ejection control and extends the service life of instrument.
Detailed description of the invention
Fig. 1 is the schematic diagram of the blood sampling needle assemblies in blood collecting pen in the prior art.
Fig. 2 is the decomposition diagram of Fig. 1.
Fig. 3 is the blood collecting pen shape stereoscopic schematic diagram (driving snap ring therein is decomposing state) of the utility model.
Fig. 4 is cross-sectional view of the Fig. 3 when launching control mechanism and being in non-emission state.
Fig. 5 be Fig. 4 in driving card cyclization hold together after schematic diagram.
Fig. 6 is in schematic diagram when limit of stretch state for spiral tension spring in Fig. 5.
Schematic diagram when Fig. 7 is elastic lock and lock neck slot disengaging clamping in Fig. 6.
Fig. 8 is schematic diagram of the Fig. 7 in ejection control mechanism in transmitting extremely in limited time.
Appended drawing reference is as follows:
Hollow core shaft 1, front axle 11, rear axle 12, axially extending bore 13, preceding hole 14, metapore 15, through slot 16, locked groove 17, wedge shapeInclined-plane 18, striker device 2, striker 21, device 22 of pulling back, trip rod 23, lock neck slot 24, spiral tension spring 25, front end 26, driving snap ring3, this side ring 31, to side ring 32, card holder 33, clip spring structure 34, elastic lock 5, interior crotch 51, hook portion 52, spine 53, release pressButton 6, acupuncture treatment 71, needle handle 72, syringe needle socket 73, ejection shaft 74, ejection release organ 75, spring 76.
Specific embodiment
As shown in figures 3-8, the blood taking needle ejection control mechanism of the utility model in blood collecting pen for that will have an acupuncture treatment by blood collecting penHollow core shaft 1 emit from inside to outside and make the acupuncture treatment syringe needle be pierced into user skin.
It includes hollow core shaft 1 (the also known as main body mandrel of blood collecting pen) and striker device 2.
One, hollow core shaft 1
1 shape of hollow core shaft is cylinder, and total length is in 40mm-50mm.The utility model is preferably stepped cylindrical,The axially extending bore 13 that the hollow core shaft 1 is moved towards and penetrated through along its axis is equipped in it, it is logical that the striker device 2 is mounted on the axial directionIn hole 13.
The cylindrical of step is respectively front axle 11 and rear axle 12 from front to back, and the periphery diameter of front axle 11 is greater than rear axle 12Periphery diameter, the axially extending bore 13 part corresponding with 11 sections of front axle are known as preceding hole 14, and axially extending bore 13 is corresponding with 12 sections of rear axlePart be known as metapore 15.
The internal diameter in the preferably preceding hole 14 of the utility model is greater than the internal diameter of metapore 15.
Be equipped with the through slot 16 that extends to the middle part of rear axle 12 on the front periphery wall of rear axle 12, through slot 16 with it is describedMetapore 15 communicates, and in 15mm-19mm, which is two and take the axis of hollow core shaft 1 as symmetrical, through slot length16 front end is supported to the interface of front axle 11 and rear axle 12.
The locked groove 17 for extending to the rear end face of the hollow core shaft 1, locked groove 17 are equipped on the periphery wall at the rear portion of rear axle 12It is communicated with the metapore 15, length also for two and is symmetrical with the axis of hollow core shaft 1 in 3mm-5mm, the locked groove 17.
The front end face of the locked groove 17 is inclined by (being inwardly directed to the axis direction of hollow core shaft 1) in forward-backward algorithmTapered ramp 18.
The mounting hole of installation release button 6 is additionally provided on the rear end face of hollow core shaft 1.
Two, striker device 2
Striker device 2 is made of striker 21, spiral tension spring 25, driving snap ring 3, elastic lock 5 and release button 6.
1, striker 21 is by pulling back device 22 and trip rod 23 is constituted.
1) it pulls back outer likeness in form " door " font of device 22, is placed in the preceding hole 14, is made by elastic material, and setThe combination for the flexible clamp piece (not shown) for being placed in acupuncture treatment (not shown) tail portion can play the role that can be quickly by needleAcupuncture treatment after thorn (after needle thorn refers to acupuncture treatment transmitting, the syringe needle of acupuncture treatment is pierced into the skin of user) is pulled back to the hollow core shaft 1.
2) trip rod 23 is cylinder, and front end is fixedly connected with device 22 of pulling back, and the utility model is preferably structure as a whole.
Trip rod 23 can shuttle in preceding hole 14 and metapore 15 and carry before the device 22 of pulling back is placed in hole 14Acupuncture treatment syringe needle by the hollow core shaft 1 front end face project and retract.
Trip rod 23 divides straight bar section and endpiece from front to back, and the uniform external diameter of straight bar section is consistent, and endpiece is truncated cone-shaped, straight-barSection and the drift slot (because it is like neck, hereinafter referred to as lock neck slot 24) that endpiece intersection is that outer diameter gradually tapers up, the lock neck slot24 are arranged around around 23 periphery of trip rod.
2, spiral tension spring 25
Spiral tension spring 25 is socketed on trip rod 23, and front end 26 is movably set in the medium position of trip rod 23,The spiral line footpath of tail end is shunk and is locked on the bar wall for closing on the trip rod 23 of the lock neck slot 24.
3, snap ring 3 is driven
Driving snap ring 3 is to be socketed on rear axle 12 and can slide back and forth along the through slot 16.
It is made of identical two semi-rings of structure and size, two semi-rings be respectively this side ring 31 and to side ring 32 (i.e.This side ring 31 be with the axis of hollow core shaft 1 to side ring 32 be symmetrical), that is, when this side ring 31 with after surrounding side ring 32 i.e.It may make up one and be socketed in complete circle on rear axle 12.
This side ring 31 and be to the shape of side ring 32 arc-shaped " E " shape, i.e., should the upper transverse part of " E " shape, inferior transverse part andVertical part constitutes semicircle, and its middle transverse part (hereinafter referred to as card holder 33) is straight rod-shaped, and the outer end of card holder 33 is connect with the vertical part,Its inner end is inserted into the through hole to connect with the front end 26 of the spiral tension spring 25.
It is equipped with clip spring structure 34 in the inner end of card holder 33, the clip spring structure 34 of the utility model is that at least two intervals are setThe convex block set, the groove between two convex blocks are just installed at least one circle helix of 25 front end 26 of spiral tension spring, whenWhen the driving snap ring 3 is moved forward and backward along the through slot 16, the spiral tension spring 25 can be with the driving snap ring 3 along the through slot16 move from the front to the back and are in tensional state.When driving snap ring 3 to be moved to the front end of through slot 16, spiral tension spring 25 is stretchedTo its limiting value.
4, elastic lock 5
Elastic lock 5 is the elastic slice that shape is in " M " shape, for ease of description its action process, is classified as several sections, respectivelyFor the foot of " M " shape, leg and spine 53, the Liang Ge foot of " M " shape is interior crotch 51, and therefore, interior crotch 51 divides hook portion 52 againThe end and.
Elastic lock 5 is mounted in the locked groove 17 on 1 rear axle 12 of hollow core shaft, the end elastic card of interior crotch 51It sets in the lock neck slot 24, the hook portion 52 of interior crotch 51 is placed on the tapered ramp 18 of the locked groove 17.
5, release button 6
The rounded short column of release button 6, end is exposed to outside hollow core shaft 1 thereafter, and front end is contradicted in the elasticityThe spine 53 of lock 5, the release button 6 is pressed into hollow core shaft 1 can be such that the end of the interior crotch 51 is detached from and the lockThe clamping of neck slot 24 simultaneously projects the trip rod 23 forward under the pulling of spiral tension spring 25.
The course of work of the utility model is as follows:
1) original state
The rearmost end that snap ring 3 will be driven to be pushed back into through slot 16, at this point, spiral tension spring 25 is in slight compression shapeState, the endpiece of trip rod 23 are touched with the elastic lock 5, moreover, the end holding of the interior crotch 51 of the elastic lock 5In the lock neck slot 24, which is in non-working condition.
2) battery
Driving snap ring 3 is moved forward, since the tail end of spiral tension spring 25 is locked in the endpiece of trip rod 23, and is hitIt hits bar 23 to be constrained by interior crotch 51 again and be fixed on the position of setting, at this point, only the front end 26 of spiral tension spring 25 is by driving cardRing 3 draws and extends, and when driving snap ring 3 to move forward and be pushed into the front end of through slot 16, spiral tension spring 25 is stretched toIts maximum value, and trip rod 23 keeps maximum static potential energy at this time.
3) emit
When user by pressing mechanism (in the pressing mechanism, except release button have in figure diagram in addition to, other component diagramsIn be not shown) release button 6 is pressed into hollow core shaft 1 after, the ridge of the front end of the release button 6 to elastic lock 5Portion 53 presses and causes the leg of elastic lock 5 to tilting on the outside of hollow core shaft 1, since the hook portion 52 of elastic lock 5 is placed in locked grooveOn 17 tapered ramp 18, the hook portion 52 is driven to slide in and out after the leg is inclined outwardly along the tapered ramp 18 of locked groove 17And the end of interior crotch 51 is made to be detached from the lock neck slot 24, when the distance between end of two interior crotches 51 is greater than trip rodWhen the outer diameter of 23 endpiece, under the action of spiral tension spring 25, trip rod 23 is projected forward.
4) pumpback
After the spiral tension spring 25 of release drives 23 high speed of trip rod to travel forward and complete acupuncture manipulation, at this point, spiralTension spring 25 and trip rod 23 cross the free state of spring 76 and make certain compression travel by inertia (to be completed in this tripAcupuncture treatment movement), when reaching compression limit, under the action of 25 restoring force of spiral tension spring, understand counter motion, i.e., it can carry and hitIt hits bar 23 to move backward, retracts syringe needle (in general, the maximum row of syringe needle when spiral tension spring 25 returns to free state by compressive stateJourney only has 2 millimeters), it pulls back so that the device 22 that will pull back takes acupuncture treatment to hollow core shaft 1.
Hereafter, when operator unclamps the thumb of pressing, mechanism external force drives snap ring 3 to return to reset condition, trip rod23 endpiece also moves into the rear portion of rear axle 12, since release button 6 is in no external force state, the interior crotch 51 of elastic lock 5It is in original state without external forces, as pumpback to the lock neck slot 24 thereon of trip rod 23 passes through interior crotch 51End when, the end of two interior crotches 51 at once again be connected in the lock neck slot 24, so far, which restores againReset condition.
The advantages of the utility model, has as follows:
1) design of striker device 2 is very simple dexterous, eliminates blood collection needles socket 73, reduces structure inertia, improves bulletFiring rate degree.
2) be kept completely separate design with blood collection needles, enable the shuttle speed of ejection faster, syringe needle in skin wounds whenBetween shorten dramatically, effectively reduce the pain of blood sampling.
3) mechanism inertia becomes smaller, and ejection impact force reduces (but having had an acupuncture treatment enough), effectively increases depth adjusting mechanism (limitPosition) accuracy and stability.
4) ejection release button 6 is arranged in the tail portion of striker device 2, coaxial design improve the sensitivity of movement, stability,Reliability and the service life for effectively extending instrument.
5) blood collecting pen only needs one ' pressing ' movement completion institute functional, and the handle without pull-up blood collecting pen in advance (opensMove spring 76) and 6 two operating processes of release button are pressed, allow patient to use more easily and easy.