CN2678565Y

CN2678565Y - Disposable blood taking needle

Info

Publication number: CN2678565Y
Application number: CN 200420024941
Authority: CN
Inventors: 王庆祝
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-02-23
Filing date: 2004-02-23
Publication date: 2005-02-16
Anticipated expiration: 2014-02-23

Abstract

The utility model relates to a medical disposable blood taking needle, comprising a needle seat (1), a needle head (2), a bottom cover (4), an end cap (5), a straight tubular shell body (3) and an ejecting cavity sheathed in with clearance fit thereof. The needle seat (1) and the bottom cover (4) are formed into an elastic connection structure through a spiral spring (6), and the inner cavity of the ejecting cavity (7) and the needle seat (1) are formed into an ejecting cavity (9) in movable fit; the column surface of the needle seat (1) is provided with a bulge (12), and the cavity wall of the ejecting cavity (9) is axially provided with a bulge guide slot (10), a slope (13) guiding the bulge (12) to slide in the bulge guide slot (10) and a bulge limiting structure in axial direction. When using, the end cap is taken down, then a hand kneads the shell body and presses aiming to blood sampling position, and thus blood sampling is completed. The medical disposable blood taking needle is a disposable blood taking needle having simple structure, no pollution and convenient operation by one hand.

Description

Disposable blood taking needle

Technical field: this utility model relates to a kind of medical disposable blood taking needle, specifically is exactly a kind of medical apparatus and instruments for chemical examination purpose blood sampling usefulness on patient's finger or ear.

Background technology: disposable ejection type blood taking needle is compared with traditional-handwork blood sampling mode, owing to have standardization, depth unanimity, adjustable controlled, pollution-free, pain is little, operant skill is required low advantage, so people have developed multiple disposable blood taking needle and the very fast one seat that occupied on market.As applying in May 8 calendar year 2001, the patent No. is 01237714.7 and is called in " disposable safe automatic blood-taking needle " that a kind of disposable blood taking needle has just been arranged, its primary structure comprises shell, blood taking needle and spring, needle handle places in the ejection chamber of shell, one end and the needle handle of ejection chamber are linked to be the Elastic Sliding structure by spring, and the pin neck stretches out from the needle outlet of the ejection chamber other end; A side of needle handle and its corresponding shell are provided with elastic arm type card and penetrate structure, feature is: on the another side of needle handle and its corresponding shell, tiltedly establish elastic arm C for one, another is provided with the stop mouth, elastic arm C end cooperates formation barb chocking construction with the stop mouth, its stop direction is the backhaul direction that blood taking needle launches, and abut is located on the path of backhaul.Be characterized in: blood taking needle ceases to be in force automatically after launching once, has got rid of disposable blood taking needle, can be reusable possible, thoroughly solved the safety problem that blood taking needle is left over, and realized " disposable " truly.During use, a hands pinches the handle position of blood taking needle shell, and another hand-screw rotating the needle neck after pin neck and the fracture of needle handle intersection, is aimed at the projection on the pin neck breach on the needle outlet and pulled out the pin neck.A hands pinches shell then, another pulls moving handle makes elastic arm B block in the bayonet socket position, aim at blood sampling site again, press elastic arm A (or claiming button), elastic arm B and bayonet socket are broken away from, compress spring promotion blood taking needle this moment and slide fast along ejection chamber, needle point passes needle outlet and stabs blood sampling site.In the ejection process, elastic arm C strides across inclined hole, but meets the guide surface that inclined hole is close in the backhaul, can creep into very dexterously in the inclined hole, finally causes the protected property of blood taking needle to be locked in this position, can't reuse.After the use, the pin neck that pulls out is put in back on the blood taking needle,, thereby reach safer purpose in case needle point emerges.Concrete operations are: the bossing of pin neck is aimed at needle outlet breach direction push in, needle point inserts pin neck origin-location, reverses 900 then, plays the safeguard protection effect because the active force of protruding locking action and spring makes the pin neck tightly clog needle outlet.By above-mentioned introduction as can be known, this automatic blood-taking needle operating process is complicated, can not one-handed performance, and because the existence of bayonet socket and breach easily makes pollutant enter in the housing pollutes.

Summary of the invention: the purpose of this utility model is to provide a kind of simple in structure for overcoming the deficiencies in the prior art, and difficult pollution can the singlehanded disposable blood taking needle of operation easily.

For achieving the above object, technical solution adopted in the utility model is: disposable blood taking needle, comprise needle stand, be fixed on syringe needle and shell on the needle stand, be provided with the needle stand ejection mechanism in the shell and launch trigger mechanism, it is characterized in that: described shell comprises the housing of straight tube-like, bottom and end cap, described needle stand is a cylindrical component, vertical fixing syringe needle on one side end face, the opposite side end face is fixedlyed connected the formation elastic connection structure through helical spring with bottom, housing intermediate gap engage sleeves is provided with and is similarly straight tube-like, front end face is provided with the cavity that launches of needle outlet, front end partly extends outside the housing during original state, be primary importance, end cap is set in the housing front end front end of the external dew of ejection chamber is covered on wherein, front end is retracted to and is the second position in the housing, described bottom fixed cap is in shell end, described inner chamber and the needle stand that launches cavity constitutes ejection chamber movingly, the cylinder of described needle stand is provided with projection, described projection and housing inner chamber are slidingly matched, the projection guide groove that is provided with is arranged on the wall of described ejection chamber chamber vertically and link to each other with the projection guide groove and form an angle, guide protrusion slips into the slope of projection guide groove, launch cavity slope when primary importance moves to the second position on the described housing relatively and within drop shadow spread on the inner walls axial direction, be provided with the projection position limiting structure, during original state, the projection of described needle stand is pressed on the slope, described helical spring is in compressive state, described projection position limiting structure is on the projection line of travel, needle stand, syringe needle and helical spring drift sum should be not more than the length of housing inner chamber.

Adopt the disposable blood taking needle of said structure, syringe needle and needle stand are to be closed in safely by end cap, and in the shell inner cavity that tubular shell and bottom are formed, environmental contaminants can't enter; In addition, during use, only need take off end cap then a hands pinch housing, aim under the blood sampling site and press, launch cavity and shift to the second position from primary importance this moment, front end is retracted to housing, owing on the inner walls axial direction, only within drop shadow spread, be provided with the projection position limiting structure, when therefore closing on the second position, the projection of needle stand has broken away from the restriction of projection position limiting structure, slip into the projection guide groove along the slope, syringe needle launches from needle outlet moment forward with needle stand and ejects and stab blood sampling site and retraction immediately in ejection chamber under the effect of inertia of helical spring and needle stand, after retraction stops, because needle stand, syringe needle and helical spring drift sum are slightly less than the length of housing inner chamber, and needle point will can not emerged, and again can not be back to primary importance and launch cavity, having guaranteed " disposable ", is a kind of both simple in structure therefore, difficult pollution again can the singlehanded disposable blood taking needle of operation easily.

The utility model is described in further detail below in conjunction with accompanying drawing, and provide embodiment.

Description of drawings:

Structure cutaway view when accompanying drawing 1 is this utility model embodiment primary importance;

Accompanying drawing 2 structural representation behind the body that shells during for primary importance;

Accompanying drawing 3 structural representation behind the body that shells during for the second position;

Accompanying drawing 4 is 4 enclosure interior structure cutaway views;

Accompanying drawing 5 is the embodiment schematic appearance.

Specific embodiment: as Fig. 1, shown in 2, the housing 3 of disposable blood taking needle and launch cavity 7 and be straight tube-like in the present embodiment, bottom 4 is provided with flange and central cavity, the cavity center is provided with spring fixed column, end cap 5 is end sealing, the tubular element that internal diameter and housing 3 external diameters match constitutes, housing 3 inner chambers and launch cavity 7 and be cylindrical, it can certainly be the cylindricality that other shapes match, launching cavity 7 is set in the housing 3, leave the gap between the inside and outside wall, launching cavity 7 inner chambers is that ejection chamber 9 is also for cylindrical, front port can be used as needle outlet 8, launch cavity 7 front ports in the present embodiment and be provided with front end face, needle outlet 8 is arranged on the front end face center, needle stand 1 is a cylindrical element, the cross section is made into movingly mutually with ejection chamber 9, vertical fixing syringe needle 2 in the heart in one side end face, the opposite side end face is fixedlyed connected the formation elastic connection structure through helical spring 6 with bottom 4 cavity center fixation post close-fittings, needle stand 1, the drift sum of syringe needle 2 and helical spring 6 should be slightly less than the length of housing 3 inner chambers, be arranged with a pair of projection 12 on needle stand 1 cylinder, described projection 12 is slidingly matched with housing 3 inner chambers, can expose outside the wall when making it in guide groove, be symmetrical arranged four sawtooth launching cavity 7 end tube wall edges, from end two projection guide grooves 10 constituting of two groovings offering of forward end vertically, projection guide groove 10 is arranged on position at the bottom of the alternate tooth, the length of guide groove should guarantee when launching cavity 7 and be in the second position, needle stand 1 projection 12 also has certain inertia preshoot surplus in guide groove, get the slope 13 that a skew back limit of the sawtooth that links to each other with projection guide groove 10 is slipped into as guide protrusion 12, projection 12 on needle stand 1 cylinder on it side relative with slope 13 be wedge shape bevel direction and slope 13 unanimities, launch on the outer wall of terminal four crowns of cavity 7 and all be provided with one section guiding convex tendon 11 that axially is provided with, the height of guiding convex tendon 11 equals to launch the gap between cavity 7 and housing 3 inside and outside walls, be slidingly matched with housing 3 inner chambers formation, described housing 3 inwalls are provided with the annular shoulder rank and launch cavity 7 external diameters near front end and are slidingly matched, the lower end of guiding convex tendon 11 flushes and forms spacing with described annular shoulder rank, launch cavity 7 front ends when the restriction original state is primary importance and partly extend housing 3 length outward, launch cavity 7 slope 13 when primary importance moves to the second position on the housing 3 relatively and within drop shadow spread on the housing 3 inwall axial directions, be provided with the retaining convex rib 14 that is provided with vertically, some retaining convex ribs 14 can evenly be set vertically from the annular shoulder rank, the height of retaining convex rib 14 equals to launch the gap between cavity 7 and housing 3 inside and outside walls equally, be slidingly matched with housing 3 inner chambers formation, spacing between the adjacent retaining convex rib 14 equal the to lead width of convex tendon 11, as shown in Figure 4.

Earlier projection 12 lozenges of needle stand 1 are against location at the bottom of the tooth of projection guide groove 10 1 sides during assembling, to launch cavity 7 front ends then is inserted in forward in the housing 3, pushing bottom 4 forward, under the promotion of helical spring elasticity and needle stand 1, guiding convex tendon 11 gap between the alignment retaining convex rib 14 automatically inserts gradually, projection 12 on simultaneously at the bottom of retaining convex rib 14 aligned teeth, along with the insertion of launching cavity 7, retaining convex rib 14 tapered end are with top on the projection 12 and slip into bar retaining convex rib 14 wherein one is on projection 12 line of travel, lozenges is resisted against on the hypotenuse of sawtooth of projection guide groove 10 1 sides, ramp effect between its lozenges and the hypotenuse makes it have the trend that slides to guide groove, bonding or the ultrasonic one that is welded between bottom 4 and the housing 3, cover end cap 5 and promptly finish, so assembling process is also very quick, simply.

Claims

1, a kind of disposable blood taking needle, comprise needle stand (1), be fixed on syringe needle (2) and shell on the needle stand (1), be provided with needle stand (1) ejection mechanism in the shell and launch trigger mechanism, it is characterized in that: described shell comprises the housing (3) of straight tube-like, bottom (4) and end cap (5), described needle stand (1) is a cylindrical component, vertical fixing syringe needle (2) on one side end face, the opposite side end face is fixedlyed connected the formation elastic connection structure through helical spring (6) with bottom (4), housing (3) intermediate gap engage sleeves is provided with and is similarly straight tube-like, what front end face was provided with needle outlet (8) launches cavity (7), front end partly extends outside the housing (3) during original state, be primary importance, end cap (5) is set in housing (3) front end and will launches the front end that cavity (7) exposes and cover on wherein, front end is retracted to and is the second position in the housing (3), described bottom (4) fixed cap is at housing (3) end, described inner chamber and the needle stand (1) that launches cavity (7) constitutes ejection chamber (9) movingly, the cylinder of described needle stand (1) is provided with projection (12), described projection (12) is slidingly matched with housing (3) inner chamber, the projection guide groove (10) that is provided with is arranged on the wall of described ejection chamber (9) chamber vertically and link to each other with projection guide groove (10) and form an angle, guide protrusion (12) slips into the slope (13) of projection guide groove (10), launch cavity (7) slope (13) when primary importance moves to the second position on the described housing (3) relatively and be provided with the projection position limiting structure within the drop shadow spread on housing (3) the inwall axial direction, during original state, the projection (12) of described needle stand (1) is pressed on the slope (13), described helical spring (6) is in compressive state, described projection position limiting structure is on projection (12) line of travel, needle stand (1), the drift sum of syringe needle (2) and helical spring (6) should be not more than the length of housing (3) inner chamber.

2, disposable blood taking needle according to claim 1, it is characterized in that: described cavity (7) the tube wall end that launches offers grooving vertically and constitutes described projection guide groove (10), and the tube wall of projection guide groove (10) porch is provided with chamfering and constitutes described slope (13); Described housing (3) inwall is provided with the retaining convex rib (14) that is provided with vertically and constitutes described projection position limiting structure in described drop shadow spread.

3, disposable blood taking needle according to claim 2 is characterized in that: it is wedge shape that described needle stand (1) projection (12) goes up a side relative with slope (13); It is described that to launch cavity (7) end tube wall edge be zigzag, the position offers grooving vertically and constitutes described projection guide groove (10) at the bottom of launching cavity (7) tube wall end tooth separately, the hypotenuse of sawtooth constitutes described slope (13), the outer wall of the crown adjacent with described projection guide groove (10) is provided with the guiding convex tendon (15) of axial setting, guiding convex tendon (15) is slidingly matched with housing (3) inner chamber, described housing (3) inwall is provided with some retaining convex ribs (14), spacing between the adjacent retaining convex rib (14) equal the to lead width of convex tendon (15), and when guiding convex tendon (15) is inserted between the retaining convex rib (14), retaining convex rib (14) should be with relative at the bottom of the adjacent tooth, the end of retaining convex rib (14) is a wedge shape, and bevel direction is consistent with slope (13).

4, disposable blood taking needle according to claim 3, it is characterized in that: described cavity (7) the end tube wall edge that launches is arranged with four sawtooth, article two, projection guide groove (10) is arranged at the bottom of separately the tooth, and retaining convex rib (14) evenly is arranged on housing (3) inwall.