CN202060783U - Novel pen type safe blood-taking needle - Google Patents

Abstract

The utility model relates to a novel pen type safe blood-taking needle which consists of a protecting sleeve, an outer cylinder, a needle base, a press key, a needle tube, a spring and a blood-blocking sleeve, wherein the front end of the outer cylinder is provided with a conical head; an inner hole of the conical head is communicated with an inner cavity of the outer cylinder; a lower section of the conical head is square; the base part of the conical head is provided with symmetrical grooves; a lower section of the needle base is provided with a spring supporting platform, the surface of the spring supporting platform has a column stand with circular inside and square outside, and a middle section of the column stand is provided with symmetrical opening flutes which correspond to the conical head grooves; a middle section of a locking sheet is provided with a square hole, the lower edge of the hole is provided with a slit, the width of the slit is equal to the outside diameter of the spring, the locking sheet is mounted in the conical head grooves of the outer cylinder and is inserted into the opening flutes of the square column stand of the needle base from the slit, the locking sheet is locked at the front end of the outer cylinder, and the spring is compressed in the conical head inner hole; and a supporting sheet is arranged below the press key, and an external periphery of the press key is provided with semi-annular protruding ridges for protection. After blood taking is finished, the limit to the opening flutes of the square column stand of the needle base can be cancelled by only pressing the press key, so that the needle base releases, and the spring resets to drive the needle tube to retract in the inner cavity of the outer cylinder. The novel pen type safe blood-taking needle has the advantages of simple structure, convenience in use, safety and reliability and automatic needlepoint retraction, is destroyed after being used once and can eliminate.

Description

A kind of novel pen type safety blood taking pin

Technical field

This utility model relates to a kind of medical apparatus and instruments, a kind of specifically novel pen type safety blood taking pin with needle holder, and it cooperates with vacuum test tube, is used for the gatherer process of venous blood specimen.

Background technology

People have following three kinds of approach usually to the collection of blood preparation: (1) subcutaneous blood sampling: be used for the simple and easy differential counting of blood constituent is detected more; Subcutaneous (real core or the prismatic needle point) blood taking needles that use more; (2), venous blood collection: be used for the collection of specimens that blood cell is learned, nosetiology, immunology and other related discipline indexs are carried out detailed detection in the blood, in clinical application very wide, use pen type or split type vein (hollow) blood taking needle more; (3), arterial blood drawing, how in critical emergency case, aterial blood gas indexes following is detected, use lessly, use arterial blood drawing syringe (band pin) to gather more.Collection and check to blood preparation, its objective is by detection bacteriology, virological infection level in analyzing and testing, acquisition blood blood component and the blood of blood constituent, to understand Human Physiology and pathologic condition, or the understanding medication effect, and to advancing of disease, lapse to and judgement etc. is made in prognosis.

In venous blood collection, various countries clinical medical and nursing personnel, most pen type blood taking needle or split type vein blood taking needles of using; This utility model only relates to the puncture blood collecting utensil in the venous blood gatherer process.

The pen type blood taking needle: its structure is the needle tubing that connects, and all there is sharp cutting edge at its two ends; Hypomere is fixed on the needle stand in the needle tubing, and front end is called that venipuncture needle, rear end are called collection blood pin, collection blood wire surface has blood resistance unit, needle tubing two ends that protective casing is arranged.During use, the blood taking needle rotation is fixed on the needle holder outer cylinder front end, implements venipuncture, after the success, vacuum test tube is inserted needle holder rear end cavity, make collection blood pin rear end cutting edge pass blood resistance unit and run through and thrust the vacuum tube plug, under suction function, in blood suction blood taking tube; So repeatedly, can realize the collection of multitube time blood specimen; Blood sampling finishes, and extracts venipuncture needle, and local hemostasis to depleted blood taking needle, needs the nurse once more with blood taking needle front end sheath, is enclosed within the blood taking needle appearance again, rotates needle body then, and blood taking needle is taken off from needle holder, blood taking needle is discarded in the waste holder again; Nurse's both hands overlap process again in this operation, and owing to multiple reason, nurse's finger is usually easily stabbed by needle point, and needle stick injury takes place, and causes the infection or the propagation of blood borne disease, as hepatitis C, acquired immune deficiency syndrome (AIDS); Consequence is extremely serious.

Split type vein blood taking needle: its structure is on the flexible pipe tail end needle stand of venoclysis needle, connects a collection blood pin and constitutes.It in use, also need the rotation of collection blood pin is fixed on the needle holder outer cylinder front end, hand-held venipuncture is implemented puncture at vein, after the success, vacuum test tube is inserted needle holder rear end cavity, make collection blood pin cutting edge pass blood resistance unit and thrust the vacuum tube plug, under suction function, blood is sucked blood taking tube.When needing, so repeatedly, can realize the multitube blood sampling; Blood sampling finishes, and extracts venipuncture needle, and local hemostasis is disposed depleted blood taking needle, needs nurse's hands to pinch collection blood pin needle stand appearance, rotates needle body then, and blood taking needle is taken off from needle holder, is discarded in the waste holder together with venipuncture needle; In the said process, because the blood sampling flexible pipe is longer, about 20 centimetres, make the remaining blood in venipuncture needle and the flexible pipe, in the process that blood taking needle and flexible pipe take off, blood can trickle everywhere, and contaminated environment or human body cause the transmission of disease may; At present, in clinical position, nurse and waste treatment personnel's finger also is very easy to be hindered by the blood taking needle spine, infects blood borne disease because of needle stick injury causes; Consequence is extremely serious.

Add up according to the American National medical department: the pricking wound that occurs in blood collection procedure accounts for 26% of needle stick injury incidence rate; Federal Government was issued " safety of acupuncture and prevention " bill in 2000: require medical institutions to be necessary for the employee safe medical apparatus is provided; The staff's of the contact blood source disease that U.S. National Institute Department of Health formulates operation standard wherein requires: in injection, puncture procedure rules, firmly stop: hands takes off syringe needle, bending syringe needle, from the broken needle head, overlap the behavior of needle guard again.

China is because economy and historical reasons are to use the syringe puncture to gather and use the mode of above two kinds of blood taking needles collection venous blood more than clinical blood sampling is operated.According to China's medical statistics, scholarly journal report, the clinical care practitioner by the incidence rate of needle stick injury up to more than 80%.Endanger extremely serious.

In sum, clinically press for a kind ofly in above-mentioned blood collection procedure, can effectively avoid needle stick injury, eliminate the safe and reliable blood taking needle utensil of blood borne disease infection risk.Just at present, domestic neither one still can be disclosed with the technical scheme of simple economy, practical safety.

Summary of the invention

This utility model is exactly the solution that proposes at the existing deficiency of above-mentioned venous blood collection process.Have safe, reliable, easy, practical, inexpensive, can simplify the clinical manipulation program, increase work efficiency, eliminate the characteristics of needle stick injury; Specifically, it is a kind of safety pen type blood taking needle with needle holder, is used for the gatherer process of vacuum test tube to venous blood.

This utility model is realized by following scheme: a kind of novel pen type safety blood taking pin, form by needle tubing, spring, needle stand, blood resistance unit, button, urceolus, sheath; It is characterized in that: needle stand central authorities are porose, bonding needle tubing in the hole, and the needle stand hypomere has the spring support platform, its periphery pocketed springs; The outer rim symmetry of spring support platform has three arcuated fin pieces of abduction downwards, and its fin maximum gauge is equal to or slightly less than the internal diameter of urceolus, is greater than the internal diameter of the prominent ridge of annular of outer tube inner wall simultaneously; On the surface of spring support platform, the needle stand periphery has the outer quadrate pylon of an interior circle vertically upward, pylon and the concentric symmetry in needle stand axle center, and Circularhole diameter is slightly larger than the spring external diameter in it.Symmetric level fluting is arranged in the stage casing of pylon; The front end of urceolus has conehead, and the conehead endoporus dwindles and communicates with outer tube inner chamber at opening part.

The pylon of interior round foreign side, its foreign side's length of side is slightly less than the length of side of square hole in the urceolus conehead basilar part, two symmetric level flutings are arranged in the stage casing of pylon, the height of fluting is greater than the thickness of button lock banking stop, distance between two flutings equals the external diameter of spring, but less than the width that cracks of lock banking stop lower end.

Button is the L shape, and lengthy motion picture is a lock banking stop, and the middle hypomere of lock banking stop has a square hole, and its length of side is slightly larger than the length of side of pylon; The curved expansion in square hole upper edge, the arc radius equals the radius of conehead hypomere periphery; The lower edge of square hole has a perforation to crack, the width of this seam is less than the length of side of pylon, but external diameter more than or equal to spring, it is barb-like that the hypomere outer rim of button lock banking stop is the wedge shape of abduction, the spacing of two barbs is greater than the distance between two projections, it is the trigger button key that there is a circular projection on the surface of the triggering sheet of button, and the width of the lock banking stop of button is slightly less than the spacing of two parallel projections of urceolus front wall surfaces.

Urceolus is a tubular structure, its inner hollow, and the outside crimping of urceolus back edge forms handle and shakes hands, outer cylinder front end has conehead, and conehead is porose and communicate with outer tube inner chamber, and the aperture dwindles in the upper end and forms the constriction step, the epimere of conehead inner chamber is a circular hole, and the aperture is slightly larger than the spring external diameter; Endoporus is square in the expansion of conehead hypomere, and this square hole length of side is slightly larger than the length of side of pylon, and the height of square hole can hold the square pylon of needle stand hypomere greater than the height of pylon; The hypomere inwall of urceolus has the prominent ridge of an annular, and the prominent ridge of annular is to the distance of the urceolus back edge length greater than blood resistance unit; The internal diameter of the prominent ridge of annular is less than the diameter of needle stand hypomere abduction fin.

There is a pair of symmetric groove antetheca contact position at the hypomere and the urceolus of conehead; , two grooves are parallel with the long axis of urceolus handle, and two groove pitch are from equaling the spring external diameter, but are slightly less than the narrow width that cracks of lock banking stop hypomere, and the height of groove is slightly larger than the thickness of button lock banking stop.

The urceolus front wall surfaces that is connected with urceolus in the conehead lower end has three projections, and wherein two projections are symmetrically distributed in the both sides of the urceolus antetheca axis parallel with urceolus handle major axis, and are to extend to the right with the axle center, and its spacing is from the width that equals lock banking stop; Another piece projection is positioned on the axis of the urceolus antetheca parallel with the long axis of urceolus handle, extends outside the conehead periphery begins left.Three projections are carried out spacing to lock banking stop.

With the outer tube side wall surface of intersecting of vertical outer cylinder front end sidewall of urceolus handle major axis and urceolus antetheca, a semi-circular prominent ridge is arranged, semi-circular prominent ridge protrudes in outer tube side wall, it highly equals outer tube wall disappearance of the apparent height of button, semi-circular prominent ridge inboard; Urceolus antetheca at corresponding site extends upward, and to the radius of 3/5ths urceolus, to the bending of urceolus below, but knuckle forms the resiliency supported sheet that is upturned less than 90 °, and its profile is less than the inner edge of semi-circular prominent ridge, and at regular intervals with it.The length of spring is greater than the distance of spring support platform to the puncture needle needle point.

Lock banking stop is installed in the groove of urceolus conehead lower end, and it is spacing fixing by three projections, the narrow place of cracking of lock banking stop inserts the groove of conehead lower end and is arranged in the fluting of the square pylon of needle stand hypomere, make the groove of urceolus conehead lower end and needle stand hypomere square pylon stage casing fluting the two be in same horizontal level, simultaneously the spring compression is fixed in the conehead inner chamber of outer cylinder front end.The edge, lower ending opening place of needle stand turns up and expands, and can be connected with blood resistance unit is nested; Needle tubing runs through needle stand goes forward side by side into blood resistance unit, uses binding agent, bonding firmly needle tubing wall and needle stand.

Above structure has been formed a kind of novel pen type safety blood taking pin of this utility model.

During use, operate: take off the front end sheath, the row vein puncture with conventional venous blood acquisition method, after the success, vacuum test tube is inserted needle holder rear end cavity, make collection blood pin cutting edge pass blood resistance unit and thrust the vacuum tube plug, under suction function, with blood suction blood taking tube.

When blood sampling finishes, urceolus (containing blood taking needle) is taken off, the vein local hemostasis.Method of disposal to the blood taking needle after using is: external, one hand-held blood taking needle holder urceolus, this hands thumb press triggers the sheet button key, make it to move down, the place of cracking of the lock banking stop of button can be lost restriction, when the square hole for the treatment of lock banking stop overlaps with the pylon of needle stand, can make needle stand pass square hole and free needle stand pylon fluting, the compression spring is released, and puncture needle, needle stand, blood resistance unit together can be recovered in the urceolus.Because the abduction fin of needle stand lower end can be made in the blood taking needle retraction process by the prominent ridge restriction of the annular of urceolus hypomere, collection blood pin is limited in the urceolus, must not expose.The puncture needle of blood taking needle epimere enters the urceolus space and no longer exposes under spring action.Eliminate medical personnel by the danger of needle stick injury.

Because this utility model has adopted needle holder and the incorporate structure of blood taking needle to make this utility model in use, no longer need the nurse in rule of operation, blood taking needle to be connected with the needle holder urceolus to screw installation, unscrew the process of taking off, reduce operation link, eliminated the risk of needle stick injury.

Because this utility model type has adopted pocketed springs outside needle stand, and button is inlaid in the conehead root, utilize its square opening and constriction slit with the symmetrical grooving locking in the square pylon stage casing on the needle stand spring support platform and the control of release, form the structure of mutual locking, make after blood sampling finishes, need only singlehandedly use thumb press trigger button key, can remove locking restriction rapidly to the pylon on the needle stand, the spring of needle stand and periphery thereof is discharged, under resilient force, needle stand drives the rapid retraction of blood taking needle and enters the needle holder urceolus; Simultaneously, needle stand lower end abduction fin is spacing by the prominent ridge of the annular of urceolus hypomere, and blood taking needle needle tubing and collection blood pin and needle stand, spring all are shielded in the space of urceolus.Have disposable use, ruin automatically after the use type, syringe needle automatically retraction enter in the urceolus and conductively-closed, eliminate medical personnel by the generation of needle stick injury.Also can alleviate nurse's work, increase work efficiency.

Description of drawings

Fig. 1 is the overall structure decomposing schematic representation of a kind of novel pen type safety blood taking pin of this utility model;

Fig. 2 is the needle stand structural representation of a kind of novel pen type safety blood taking pin of this utility model;

Fig. 3 is the partial sectional view of the needle stand pylon of a kind of novel pen type safety blood taking pin of this utility model;

Fig. 4 is the needle stand longitudinal sectional view of a kind of novel pen type safety blood taking pin of this utility model;

Fig. 5 is the press-key structure sketch map of a kind of novel pen type safety blood taking pin of this utility model;

Fig. 6 is a kind of novel pen type safety blood taking pin outer tube structure sketch map of this utility model;

Fig. 7 is a kind of novel pen type safety blood taking pin urceolus vertical view of this utility model;

Fig. 8 is the cutaway view of a kind of novel pen type safety blood taking pin urceolus of this utility model along the handle major axis;

Fig. 9 is the self-contained structure cutaway view of a kind of novel pen type safety blood taking pin of this utility model;

Figure 10 is the button of a kind of novel pen type safety blood taking pin of this utility model and needle stand, the chimeric partial sectional view of urceolus;

Figure 11 is that a kind of novel pen type safety blood taking pin of this utility model uses the back needle tip retracts to go into the cutaway view of outer tube inner chamber.

The specific embodiment

Fig. 1 is the overall structure decomposing schematic representation of a kind of novel pen type safety blood taking pin of this utility model; As seen from the figure, a kind of novel pen type safety blood taking pin of this utility model is made up of several lower parts: needle tubing 1, spring 2, needle stand 3, blood resistance unit 4, urceolus 5, button 6, sheath 7.The front end of needle tubing 1 has sharp cutting edge, is venipuncture needle 1a, and also there is sharp cutting edge the rear end, is collection blood pin 1b; Blood resistance unit 4 is the blind pipe of a hollow, and its front end oral area tube wall thickens and is 4a; Spring 2 is made for stainless steel material, and it is a length L, and external diameter is T.Urceolus 5 is a hollow pipe, the handle 5e that the front end center has conehead, rear end to have the outer wall crimping to form, and front end side wall has semi-circular prominent ridge 5g; Button 6 is a L shaped tabs; Sheath 7 is the hollow blind pipe.

Fig. 2 is the needle stand structural representation of a kind of novel pen type safety blood taking pin of this utility model.Center, the upper end of needle stand 3 has a through hole 3a, the edge of needle stand lower end perforate 3a to be to turn up expands 3f.

Fig. 3 is the needle stand longitudinal sectional view of a kind of novel pen type safety blood taking pin of this utility model; Fig. 4 is the partial sectional view of the needle stand pylon of a kind of novel pen type safety blood taking pin of this utility model; By Fig. 3, at the middle hypomere of needle stand 3 a spring support platform 3d is arranged, in conjunction with Fig. 2, the arcuated fin piece 3e of symmetric three downward abductions is arranged in the outer rim of support platform 3d, maximum gauge is equal to or slightly less than urceolus 5 internal diameters between its span; In conjunction with Fig. 4, on the surface of spring support platform, the outer quadrate pylon of interior circle is vertically upward arranged, circular diameter is slightly larger than spring external diameter T in it, and its foreign side's length of side is slightly less than the length of side of urceolus conehead endoporus hypomere square hole; Two symmetric fluting 3c are arranged in the stage casing of pylon 3b, and the height of fluting 3c is slightly larger than the thickness of button lock banking stop, and the distance P between the two fluting 3c equals spring external diameter T, but is slightly less than the narrow width that cracks in button lock banking stop lower end; Fluting 3c makes pylon 3b inner chamber communicate with the external world.

Fig. 5 is the structural representation of the button 6 of a kind of novel pen type safety blood taking pin of this utility model.As shown in Figure 3, button 6 is tabs of a L type structure, and its lengthy motion picture is a lock banking stop, and there is square opening 6b the middle hypomere center of lock banking stop, and this hole length of side is slightly larger than the length of side of the square pylon 3b of needle stand; The curved H in square hole upper edge enlarges, and the arc radius equals the radius of urceolus conehead hypomere periphery; The lower edge of square hole 6b has one to run through the 6c that cracks, and its width Q that cracks is less than the length of side of the square pylon 3b that is positioned at the needle stand hypomere, but equals or be slightly larger than spring external diameter T; The hypomere outer rim of lock banking stop has the wedge shape barb 6d of abduction, and the distance between the wedge shape barb is greater than the distance between the two projection 5b1 of urceolus front wall surfaces; The short-movie of button 6 is for triggering button, and its appearance has a circular projection 6a, touches the location sense to increase hands, is convenient to accurate operation.

Fig. 6 is the outer tube structure sketch map of a kind of novel pen type safety blood taking pin of this utility model: urceolus 5 rounded tubular structures, its inner hollow, the outside crimping of urceolus 5 back edges forms the handle 5e that shakes hands, outer cylinder front end has circular conehead, the central porose 5a in conehead upper end, the hole communicates with outer tube inner chamber, the aperture dwindles at front end and forms the constriction step, on the urceolus antetheca that conehead and urceolus 5 join, several piece projection 5b is arranged, there is a semi-circular prominent ridge 5g on outer tube side wall surface intersecting with the vertical outer cylinder front end sidewall of urceolus handle major axis and urceolus antetheca.There is a support chip 5f who is upturned the inboard of prominent ridge 5g.

Fig. 7 is a kind of novel pen type safety blood taking pin urceolus vertical view of this utility model; Fig. 8 is the cutaway view of a kind of novel pen type safety blood taking pin urceolus of this utility model along the handle major axis; By Fig. 7, Fig. 8 as can be known, on the urceolus antetheca that conehead and urceolus 5 join three projections are arranged, two projection 5b1 wherein are symmetrically distributed in the both sides of the urceolus antetheca axis parallel with urceolus handle 5e major axis, and be to extend to the right with the axle center, distance equals the width of lock banking stop between two projections; Another piece projection 5b2 is positioned at the surface of the urceolus antetheca axis parallel with urceolus 5 handle 5e long axis, extends outside the conehead periphery begins left.Three projections are carried out spacing to the lock banking stop of button 6.

As shown in Figure 8, conehead hypomere endoporus enlarges and becomes square (seeing the local cross-sectional B of Fig. 8 conehead), and its square hole length of side is slightly larger than the length of side of the square pylon 3b of needle stand hypomere, and its square hole height is slightly larger than the height of square pylon 3b; There are two symmetric groove 5c (seeing the local cross-sectional A of Fig. 8 conehead) the conehead lower end that joins with urceolus 5 antethecas; Distance R between two grooves is slightly larger than spring external diameter T, and less than the crack width Q of 6c of lock banking stop constriction, its groove 5c highly is slightly larger than the thickness of button lock banking stop; Groove 5c is parallel with urceolus handle 5e long axis, and groove 5c makes the conehead inner chamber communicate with the external world.See Fig. 7, Fig. 8, there is a semi-circular prominent ridge 5g on the outer tube side wall surface intersecting with the vertical outer cylinder front end sidewall of urceolus handle major axis and urceolus antetheca.The outer tube side wall disappearance of semi-circular prominent ridge 5g inboard; Urceolus antetheca at corresponding site extends upward, and to 3/5ths radius, to urceolus below bending, knuckle forms the resiliency supported sheet 5f that is upturned less than 90 °, and its profile and semi-circular prominent ridge match, but less than semi-circular prominent ridge 5g, and gapped with it.At the hypomere inwall of urceolus 5, the prominent ridge 5d of an annular is arranged, the prominent ridge 5d of annular is to the distance Y of the handle edge 5e length greater than blood resistance unit 4, and annular is dashed forward the internal diameter of ridge less than the diameter of needle stand hypomere abduction fin 3e.

Fig. 9 is the overall structure cutaway view of a kind of novel pen type safety blood taking pin of this utility model; Figure 10 is the button of a kind of novel pen type safety blood taking pin of this utility model and needle stand, the chimeric partial sectional view of urceolus; By Fig. 9, Figure 10 as can be known: puncture needle tubing 1 is bonded in the through hole of needle stand 3, epimere is long slightly, be venipuncture needle 1a, it is short slightly that the hypomere of needle tubing exposes the part of needle stand, be collection blood pin 1b, the two length differs about 2 times, and the spring support platform 3d of hypomere goes up bearing spring 2 in the needle stand 3, the 3b of the portion of expanding of needle stand lower end and blood resistance unit 4 end 4a sockets, blood resistance unit 4 will collect blood pin 1b and be wrapped in fully in its blister cavities; Needle stand 3 is positioned at the inner chamber epimere of urceolus 5, in conjunction with Figure 10, as seen the 6c of place that cracks of the hypomere of the lock banking stop of button 6 extend among the fluting 3c of the groove 5c of urceolus conehead basilar part and needle stand pylon, lock banking stop is the front end of the spacing tube inner chamber outside of needle stand 3 lockings, makes the fluting 3c of square pylon of needle stand 3 and the groove 5c of urceolus conehead basilar part be in same plane; Simultaneously spring 2 is compressed in the conehead inner chamber; Button key 6a then disappears in the semi-circular prominent ridge 5g of urceolus 5 front end side wall, and its bottom surface has support chip 5f to support, to avoid transporting the false triggering in carrying or the operating process.Puncture needle 1a appearance has sheath 7 to cover, the inboard and conehead appearance close-fitting of the port of sheath 7, but can pull out.

More than constitute the overall structure of a kind of novel pen type safety blood taking pin of this utility model.

Figure 11 be a kind of novel pen type safety blood taking pin of this utility model after use, needle structure is ruined type, needle tubing 1 and needle stand 2 and is retracted to the structure cutaway view that urceolus 5 inner chambers are protected fully; In conjunction with Fig. 9 and Figure 10, when a kind of novel pen type safety blood taking pin of this utility model need use, pull up the sheath 7 of blood taking needle front end earlier, according to the venipuncture routine, tie up the vein tourniquet, after treating the local skin sterilization of puncture portion, the right hand is held this utility model safety blood taking pin urceolus 5, row vein puncture, wait to puncture successfully after, the right hand is held fixedly venipuncture needle 1a position of urceolus 5, left hand is taken vacuum test tube, the plug end is inserted urceolus 5 tail end cavitys, and thumb is pressed the vacuum test tube bottom, and four refer to separately control urceolus crimping handle 5e, finger is firmly held mutually, vacuum test tube is inserted urceolus 5, make collection blood pin 1b puncture blood resistance unit 4 and pass vacuum test tube front end plug, the negative pressure of vacuum in the blood taking tube can enter vacuum test tube with the suction of vein blood vessel inner blood.When treating that negative pressure disappears, that is gather blood volume when reaching pre-provisioning request, extract blood taking tube; If desired, can above-mentioned repeatedly action, realize the venous blood collection of multitube.When treating that blood sampling finishes, extract vein blood taking needle, the proficiency local pressing type hemostasia, grip the hands of safety blood taking pin urceolus in addition, available this hands thumb is pushed downwards and is triggered button 6a, make it to move down along outer cylinder front end conehead groove place, make the narrow 6c of the cracking place of lock banking stop front end leave the pylon 3b fluting 3c of needle stand, then make lock banking stop front end square hole 6b place overlap corresponding with needle stand pylon 3b, because of the square hole length of side is slightly larger than the outer quadrate length of side of needle stand pylon 3b, the pylon 3b of needle stand breaks away from the restriction of lock banking stop stenosis 6c, spring 2 is discharged, drive needle stand 3, needle tubing 1, blood resistance unit 4 together bounces back and enters in the space of urceolus 5, is stopped in the urceolus by the prominent ridge 5d restriction of the annular of urceolus 5 inwalls until the abduction fin 3e of needle stand 3.

Because the maximum gauge of the abduction fin 3e of needle stand 3 is equal to or less than the diameter of outer tube inner chamber, but internal diameter greater than the prominent ridge 5d of wall circular in the urceolus hypomere, so, when needle stand lower end abduction fin 3e when the whereabouts touches the prominent ridge 5d of outer tube inner wall annular, can make needle stand 3 and collection blood pin 1b by the prominent ridge 5d restriction of the annular of urceolus 5 inwalls and stop in the urceolus.Because spring 2 length L are greater than the length W of needle stand spring support platform 3d to venipuncture needle point 1a; Urceolus length is greater than needle tubing length; The prominent ridge 5d of ring-type is to the distance Y of the urceolus lower edge length greater than blood resistance unit 4.After above structure and condition have guaranteed that the needle tubing retraction enters urceolus, and because the effect of spring 2 can not expose to outside urceolus and the cone head hole needle tubing needle point.

Claims (8)

1. a novel pen type safety blood taking pin is made up of needle tubing (1), spring (2), needle stand (3), blood resistance unit (4), urceolus (5), button (6) and sheath (7); It is characterized in that: central porose (3a) of needle stand (3), interior bonding needle tubing (1), the needle stand hypomere has spring support platform (3d), its periphery pocketed springs (2), the outer rim symmetry of spring support platform (3d) has three arcuated fin pieces of abduction (3e) downwards, its fin maximum gauge is equal to or slightly less than the internal diameter of urceolus (5), is greater than the internal diameter of the prominent ridge (5d) of annular of outer tube inner wall simultaneously; On the surface of support platform (3d), the outer quadrate pylon (3b) of an interior circle is vertically upward arranged around the needle stand, itself and the concentric symmetry in needle stand axle center, circular hole directly is slightly larger than spring (2) external diameter (T) in it, in the stage casing of pylon (3b) symmetric fluting (3c) is arranged; The front end of urceolus (5) has conehead, and conehead endoporus (5a) dwindles and communicates with urceolus (5) inner chamber at opening part.

2. according to the said a kind of novel pen type safety blood taking pin of claim 1, it is characterized in that: the pylon of interior round foreign side (3b), its foreign side's length of side is slightly less than the length of side of square hole in the urceolus conehead basilar part, two symmetric level flutings (3c) are arranged in the stage casing of pylon (3b), the height of fluting is greater than the thickness of button (6) lock banking stop, distance (P) between two flutings equals the external diameter (T) of spring (2), but less than the width (Q) of crack (6c) of lock banking stop lower end.

3. according to the said a kind of novel pen type safety blood taking pin of claim 1, it is characterized in that: the middle hypomere of the lock banking stop of button (6) has a square hole (6b), and its length of side is slightly larger than the length of side of pylon (3b); Square hole (6b) upper edge curved (H) enlarges, and the arc radius equals the radius of conehead hypomere periphery; The lower edge of square hole (6b) has one to connect crack (6c), the width of this seam (Q) is less than the length of side of pylon (3b), but external diameter (T) more than or equal to spring (2), the hypomere outer rim of button (6) lock banking stop is the wedge shape barb-like (6d) of abduction, the spacing of two barbs (6d) is greater than the distance between two projections (5b1), the surface of the triggering sheet of button (6) has a circular projection (6a) to be the trigger button key, and the width of pressing the lock banking stop of (6) key is slightly less than the spacing of two parallel projections of urceolus front wall surfaces (5b1).

4. according to the said a kind of novel pen type safety blood taking pin of claim 1, it is characterized in that: urceolus (5) is a tubular structure, its inner hollow, the outside crimping of urceolus (5) back edge forms handle and shakes hands (5e), and outer cylinder front end has conehead, and conehead porose (5a) also communicates with outer tube inner chamber, the aperture dwindles in the upper end and forms the constriction step, endoporus is square in the expansion of conehead hypomere, and this square hole length of side is slightly larger than the length of side of pylon (3b), and the height of square hole is greater than the height of pylon (3b); The hypomere inwall of urceolus (5) has the prominent ridge (5d) of an annular, and the prominent ridge (5d) of annular arrives the length of the distance (Y) of urceolus (5) back edge greater than blood resistance unit (4); Prominent ridge (5d) internal diameter of annular is less than the diameter of needle stand hypomere abduction fin (3e).

5. according to the said a kind of novel pen type safety blood taking pin of claim 1, it is characterized in that: there is a pair of symmetric groove (5c) the antetheca contact position at the hypomere and the urceolus (5) of conehead; Two groove pitch equal spring (2) external diameter from (R), but are slightly less than the width (Q) of narrow the cracking (6c) of lock banking stop hypomere, and the height of groove (5c) is slightly larger than the thickness of button (6) lock banking stop.

6. according to the said a kind of novel pen type safety blood taking pin of claim 1, it is characterized in that: urceolus (5) front wall surfaces that is connected with urceolus (5) in the conehead lower end, three projections are arranged, wherein two projections (5b1) are symmetrically distributed in the both sides of the urceolus antetheca axis parallel with urceolus (5) handle (5e) major axis, and be to extend to the right with the axle center, its spacing is from the width that equals lock banking stop; Another piece projection (5b2) is positioned on the axis of the urceolus antetheca parallel with the long axis of urceolus handle (5e), extends outside the conehead periphery begins left.

7. according to the said a kind of novel pen type safety blood taking pin of claim 1, it is characterized in that: with the outer tube side wall surface of intersecting of vertical outer cylinder front end sidewall of urceolus handle major axis and urceolus antetheca, one semi-circular prominent ridge (5g) is arranged, the outer tube wall disappearance of semi-circular prominent ridge inboard; Urceolus antetheca at corresponding site extends upward, and to the radius of 3/5ths urceolus, to the bending of urceolus below, but less than 90 °, forms the resiliency supported sheet (5f) that is upturned, and its profile is less than the inner edge of semi-circular prominent ridge (5g), and at regular intervals with it.

8. according to the said a kind of novel pen type safety blood taking pin of claim 1, it is characterized in that: the length (L) of spring (2) is greater than the distance (W) of spring support platform (3d) to puncture needle (1a) needle point.

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