CN102284104A

CN102284104A - Safety vein puncture needle

Info

Publication number: CN102284104A
Application number: CN2011102316823A
Authority: CN
Inventors: 张亚平
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-08-12
Filing date: 2011-08-12
Publication date: 2011-12-21
Anticipated expiration: 2031-08-12
Also published as: WO2013023435A1; CN102284104B

Abstract

The invention relates to a safety vein puncture needle, which consists of a sheath, a needle tube, a needle base, a hose, a spring, a shielding sleeve and a disconnection cut-off clamp, wherein the needle tube is inserted and bonded at the front end of the needle base; the needle base is inserted into a longitudinal groove in an inner cavity of the front section of the shielding sleeve by a side wall ridge and is positioned, so that the direction of a cutting edge of a puncture needle tip is consistent with that of a handle; the shielding sleeve is sleeved outside the needle tube, the needle base and the hose; the spring can be compressed in space of the shielding sleeve and the front end of the needle base; the tail end of the shielding sleeve is bonded with the hose by high-frequency heat seal; the disconnection cut-off clamp is sleeved on the tail section of the shielding sleeve, and is inserted into an opening window of the shielding sleeve; and the wall of the lower section of the shielding sleeve is thickened to form a constricted pipe cavity, so that the side wall ridge at the front end of the needle base can be limited. When the puncture needle is used, a thin bridle of the shielding sleeve can be disconnected only by pinching the disconnection cut-off clamp, so that the shielding sleeve moves forwards under the acting force of the spring to cover the puncture needle completely, and the hose is closed by the cut-off clamp to the risk of needling harm, prevent bloodstain, liquid medicine and body fluid in the hose from overflowing and reduce the propagation of hematogenic diseases.

Description

A kind of safety venipuncture needle

(1) technical field

The present invention relates to a kind of medical apparatus and instruments, a kind of specifically being used for to the interior collection of specimens of vein blood vessel (also can be the chamber that is used to organize), to the safety puncture needle of vein blood vessel infusion medicinal liquid, venous blood collection and venous transfusion process.

(2) background technology

People usually need be by puncturing to vein blood vessel when disease preventing and treating, to material in the vein blood vessel gather, analytical control obtains Human Physiology or pathological state; Also, medicinal liquid infusion such as vein blood vessel two are reached whole body, performance, compensation, alternative and therapeutical effect usually by to the vein blood vessel puncture; At above check and therapeutic process, all need a kind of venipuncture needle, realize the damage that has of human vein blood vessel is got involved, thereby set up external to endovascular occasional passage.

In this process, venipuncture needle has the dual function that (to vein blood vessel or organize chamber) fixed point got involved and set up occasional passage, needs consummate technology, also exists certain dangerously, must carry out under professional and technical personnel's control.

At present; the various venipuncture needles (transfusion needle, blood transfusion needle, blood taking needle, living tissue examination by centesis pin, remaining needle etc.) that use can both satisfy above-mentioned requirements both at home and abroad; but also all exist wretched insufficiency and defective: present venipuncture needle both domestic and external; after in above environment, using; the venipuncture needle needle point is exposed outside; the needle point of contact patient blood usually can cause needle stick injury to medical personnel and waste treatment personnel, causes the infection and the propagation of blood borne disease.In addition, in clinical, common transfusion device and transfusion needle, after extracting venipuncture needle, needle point not only exposes, and, still can constantly leak owing to remain in the ducted medicinal liquid of transfusion device, blood, body fluid etc., drop onto in the environment, cause pollution or infection equally environment and other crowds.Cause the propagation of blood borne disease or other diseases.

In the venipuncture utensil, engineers and technicians both domestic and external have done a large amount of work, the safe intravenous infusion needle of various ways has been researched and developed in design, is mostly to utilize machinery (spring) power or manual method that transfusion needle needle body (containing needle point) pull retraction is entered the interior technical scheme of protective casing; Also can only realize protection and shielding to needle point, prevent the generation of needle stick injury, but all can not effectively transfusion (blood) pipeline effectively be ended, the excessive and trickling of anti-hemostasis (body, medicine) liquid reduces pollution and infection to environment and human body.

At present, in the world,, can satisfy the demand of above-mentioned environment simultaneously to venipuncture needle still without any a kind of technical scheme.Promptly the requirement that prevents needle stick injury to be satisfied, the requirement of interior residual liquor of pipeline or the excessive trickling of body fluid will be prevented simultaneously.

We are at clinical common venipuncture needle, and its purposes has several several down:

1, 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.

2, 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 injection puncture and 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.

3, venoclysis needle: the venoclysis needle of the clinical use of China, simple in structure, do not possess safety guard (typical structure is seen accompanying drawing 1) substantially, form by needle tip shield, needle stand, venipuncture needle, flexible pipe; Be that medical personnel are by the main utensil of needle stick injury.According to China's medical statistics, the scholarly journal report, the clinical care practitioner up to more than 80%, is endangered extremely serious by the incidence rate of needle stick injury.

In sum, clinical press for a kind of above-mentioned in infusion medicinal liquid, blood transfusion, blood sampling, collection of body fluids process, can shield, effectively avoid needle stick injury to puncture needle; Simultaneously can be automatically to the above pipeline cut-off of puncture needle end, prevent blood, body fluid, medicinal liquid residual fraction in above environment excessive trickling, can eliminate the safe and reliable venipuncture needle utensil of blood borne disease infection risk.Just at present, both at home and abroad still without any being disclosed with the technical scheme of simple economy, practical safety.

(3) summary of the invention

The present invention is exactly at above-mentioned vein, organizes chamber to puncture, and realizes transfusion, blood transfusion, the existing deficiency of collect specimen process and the solution that proposes.Have safe, reliable, easy, practical, inexpensive, can simplify the clinical manipulation program, increase work efficiency, eliminate needle stick injury, prevent blood, the characteristics of the excessive trickling of body fluid; Specifically, it is a kind of safety venipuncture needle with needle tip shielding, liquid conduits stopper, can be used for the process of collection, infusion medicinal liquid, blood transfusion, tissue specimen collection and treatment to venous blood.

The present invention is achieved by the following scheme: a kind of safety venipuncture needle, by sheath, puncture needle tubing, needle stand, flexible pipe, spring, shielded tube, form by folder; It is characterized in that: it is characterized in that: needle tubing is pegged graft and to be cemented in the medium pore of needle stand front end, needle stand back segment reduced and with flexible pipe grafting cementation; Shielded tube is enclosed within the appearance of spring, needle tubing, needle stand, flexible pipe, and spring is compressed in the space of shielded tube leading portion and the formation of needle stand front end; The end of shielded tube and flexible pipe bond mutually by high frequency heat seal or alternate manner, keep the compression to spring; Be contained in the end of shielded tube from breaking by chuck, about folder, be inserted in the last dropping window of shielded tube latter end from disconnected shear plate from disconnected.

There is a pair of vertical semicircle ridge of dashing forward needle stand leading portion both sides, and the needle stand hypomere is tapered to be dwindled and flexible pipe grafting cementation, and make needle point cutting edge plane parallel with the line of two vertically prominent ridges.

Shielded tube is a hollow structure, and its front end perforate is dwindled, and its diameter equals or large needle external diameter of pipe slightly; The leading portion inside diameter D 0 of shielded tube is equal to or slightly greater than the external diameter of spring; The middle leading portion outside of shielded tube has the flat structure of a transverse projections at least, forms operating grip; Equal or be slightly larger than the body diameter Z of needle stand leading portion at the middle leading portion intracavity diameter D of shielded tube; The circle sidewall has a pair of semicircle longitudinal groove in the middle leading portion of shielded tube, and its maximum spacing D1 equals or be slightly larger than the spacing Z1 of two vertically prominent ridges of needle stand leading portion lateral wall, and the plane parallel of the line of two longitudinal grooves and flat handle; The posterior segment intracavity diameter D2 of shielded tube is equal to or slightly greater than the spacing Z1 of the vertically prominent ridges in two of needle stand sides, and at the latter end of shielded tube, tube wall has two corresponding up and down to be about laterally windowing of 3mm, and the thin light wall pipe wall of the both sides of windowing forms frenulum; Internal surface of sleeve pipe in the place ahead of windowing thickens, make this place's casing inner diameter less than between two of the needle stand leading portion vertically prominent ridges apart from Z1.

Make by hard material or metal material by folder from disconnected, its upper and lower plates structure that takes the shape of the letter U, there is a circular hole its lowest point, flexible pipe passes this hole, make it be sleeved on the end of shielded tube, from disconnected last front edge of board a pair of inserted link that has the stopper button is arranged, can insert down in the wedged hole of front edge of board, form the self-locking non-return structure by folder; In the front center of upper and lower plates to a pair of arc backing plate should be arranged, form to flexible pipe by folder; By the outside of folder, the front end of upper and lower plates a pair of mutual intersection is respectively arranged but closely contact from disconnected shear plate, be similar to two and half plates of plate shearing machine or shears.In clinical, when above-mentioned diagnosis, therapeutic process end, medical personnel use finger firmly to pinch and press by folder, interact up and down from disconnected shear plate, are being in contact with one another the seam place, and small frenulum that can the place of windowing of shielded tube is residual is rapid to be sheared from disconnected; Simultaneously, closed up and down by folder, with flexible pipe inner chamber closure, liquid in the flexible pipe is ended, owing between the upper and lower plates stopper button and wedged hole effect are arranged, make that above-mentioned action effect continues to keep.From the shielded tube of having no progeny, lost the adhesion with flexible pipe, under the spring force effect, move forward rapidly, needle tip is covered shielding, interact and stop up to the tail end narrowing portion of shielded tube and needle stand lateral process ridge.Making shielded tube cover needle point fully and don't excessively move forward comes off.

During use, operate with conventional venipuncture method: take off the front end sheath, the row vein puncture after the success, is implemented operations such as venoclysis medicinal liquid, venous blood collection, blood transfusion, biological fluid extracting and treatment.

When above treatment or diagnosis end, firmly push by folder from disconnected of the present invention, make from disconnected and the connection frenulum at the shielded tube place of windowing is sheared from disconnected by folder, simultaneously the flexible pipe extruding is ended, tooth button inserted link and wedged hole effect keep above action, can realize flexible pipe by sealing, because shielded tube from the tractive that has broken, broken away from flexible pipe, moves forward it at acting force of the spring, and puncture needle is shielded.Reach the elimination needle stick injury, prevent the effect that blood, body fluid or overflow of drug fluid trickle, reduce or eliminate the propagation of blood borne disease, eliminate medical personnel by the danger of needle stick injury.

Because the present invention has adopted at venipuncture needle hose overcoat dress shielded tube, built-in spring and tail end and has installed by the structure from disconnected folder, makes the present invention have following characteristics:

1, shielded tube is with the flexible and transparent pipe, with the handle one, is placed on the flexible pipe appearance, can not influence the localized immobilization of venipuncture needle, does not also increase patient's discomfort; What multiple safe vein pin at present both domestic and external adopted all is the hard protective casing, after venipuncture needle enters local vascular, protective casing upwarps at the needle handle afterbody, form certain angle with body surface organization and be difficult to fix, venipuncture needle had have a strong impact on, its mobile meeting involves the position of venipuncture needle in vein blood vessel, usually causes wearing out of blood vessel endothelium;

2, the flexible and transparent shielded tube of the present invention's employing, spring is compressed between needle stand and the sleeve pipe, and with high frequency heat seal mode (or other bonding mode), shielded tube and liquid hose is bonding, and in addition dress from disconnected by inspiration, restriction, the self-locking device of folder as security feature.Make the present invention have, shielded tube can be moved forward, cover venipuncture needle fully in flexible pipe inner liquid medicine, body fluid or blood flow.Can realize that a step finishes to the protection of venipuncture needle with to the ending of liquid in the flexible pipe, can eliminate the generation of needle stick injury, avoid the pollution of blood, medicinal liquid, body fluid, reduce transmission of disease medical personnel and environment;

3, suit pressed from both sides from disconnected ending outside flexible pipe and shielded tube end because type of the present invention has adopted, should be from disconnected by folder unique stopper button inserted link and wedged hole structure, form symmetric automatic blocking structure, make after venipuncture (infusion medicinal liquid, blood transfusion, blood sampling, treatment) finishes, need only singlehandedly use the thumb forefinger to push by folder, can shear being connected rapidly from disconnected shielded tube frenulum and flexible pipe, remove the compression restriction of shielded tube to spring, spring is discharged, under resilient force, the shielded tube reach shields needle point; Simultaneously, by folder flexible pipe is pushed closure and end, above-mentioned action is once finished, and can alleviate nurse's work, increases work efficiency.

(4) description of drawings

Fig. 1 is the overall structure sketch map of common plain edition venipuncture needle;

Fig. 2 is the branch destructing sketch map of a kind of safety venipuncture needle of the present invention;

Fig. 3 is the structural representation of the needle stand of a kind of safety venipuncture needle of the present invention;

Fig. 4 is the structural representation of the shielded tube of a kind of safety venipuncture needle of the present invention;

Fig. 5 be a kind of safety venipuncture needle of the present invention from disconnected structure cutaway view by folder;

Fig. 6 is the integral assembling structure sketch map of a kind of safety venipuncture needle of the present invention;

Fig. 7 be a kind of safety venipuncture needle of the present invention after use, start the overall structure sketch map behind the safety device.

(5) specific embodiment

Fig. 1 is traditional venoclysis needle, venipuncture needle A1 and needle stand cementation, and be connected with interface block A4 by means of the other end of flexible pipe A3, in use in (treatments such as venous blood collection, transfusion, blood transfusion, body fluid extraction) process, because the connection flexible pipe of puncture needle is longer, about 20 centimetres, remaining blood in the venipuncture needle of front end and the flexible pipe (blood transfusion or blood collection procedure), medicinal liquid or body fluid (operative treatment process) can not be discharged from, when said process finishes, blood, medicinal liquid and body fluid will trickle everywhere, contaminated environment or human body; Because the vein needle point exposes, owing to multiple reason, nurse and waste treatment personnel's finger also is very easy to be stabbed by needle point, has the needle stick injury risk; Consequence is extremely serious.

Fig. 2 is the overall structure decomposing schematic representation of a kind of safety venipuncture needle of the present invention, as seen from the figure, a kind of safety venipuncture needle of the present invention is by forming with the lower part: sheath 0, needle tubing 1,, needle stand 2, flexible pipe 3, spring 4, shielded tube 5, from disconnected by folder 6.Sheath 0 is a transparent blind pipe, can peg graft with the front end of shielded tube 5; The front end of needle tubing 1 has sharp cutting edge 1a, forms venipuncture needle; Needle stand 2 is a tubular structure, and the leading portion appearance has a pair of vertically prominent ridge 2a, and front end has perforate 2b, and its aperture cooperates with needle tubing 1 diameter and needle tubing 1 is cemented in the hole; Flexible pipe 3 is a water white flexible duct, is the passage of conveying medicinal liquid, blood, body fluid, one end and needle stand 2 rear end grafting cementations, and an other end then can be connected with infusion device; Spring 4 is stage clips of being made by stainless steel material, and its length is greater than the length of needle tubing 1; Shielded tube 5 is transparent hollow tube made from flexible material, and its front end oral area tube wall is reduced into 5a, and its opening diameter is equal to or greater than the external diameter of needle tubing 1; The leading portion outside of shielded tube 5 has an abduction fin at least, forms operating grip 5b, at the hypomere of shielded tube 5, a pair of dropping window 5d of going up is arranged, and the thin light wall pipe wall of the both sides of windowing forms and connects frenulum 5e; From the disconnected folder 6 that ends is that a shearing with self-locking check function ends folder from breaking, and it can be that hard material or metal material are made.

Fig. 3 is needle stand 2 structural representations of a kind of safety venipuncture needle of the present invention.Referring to Fig. 3-1. with Fig. 3-2., needle stand 2 is cylindric, its external diameter is Z, and there is a through hole 2a its front end center, and its aperture is equal to or greater than the external diameter of needle tubing 1, and the outer surface of needle stand 2 leading portions has a pair of vertically prominent ridge 2a, and its spacing is Z1; The horizontal direction consistent with the needle tubing edge direction (in conjunction with Fig. 2) of two prominent ridge lines; Needle stand 2 back segment reduced diameter are with flexible pipe grafting cementation (combining Fig. 2).

Fig. 4 is the structural representation of the shielded tube 5 of a kind of safety venipuncture needle of the present invention.Referring to Fig. 4-1., Fig. 4-2. as can be known, shielded tube 5 is hollow pipes made from flexible clear materials, its front end perforate tube wall is reduced into 5a, its opening diameter is equal to or greater than the external diameter of needle tubing 1; The leading portion inside diameter D 0 of shielded tube 5 is equal to or slightly greater than the external diameter of spring 4; The middle leading portion both sides of shielded tube 5 have an abduction fin at least, become operating grip 5a; Equal or be slightly larger than the body diameter Z of needle stand 2 leading portions at the middle leading portion intracavity diameter D of shielded tube 5; Circle sidewall in the middle leading portion of shielded tube 5, a pair of semicircle longitudinal groove 5c is arranged, its maximum spacing D1 equals or is slightly larger than the spacing Z1 of two vertically prominent ridge 2a of needle stand 2 leading portion lateral walls, and the plane parallel of the line of two longitudinal groove 5c and flat handle 5c; The posterior segment intracavity diameter D2 of shielded tube 5 is equal to or slightly greater than the spacing Z1 of two the vertically prominent ridge 2a in needle stand 2 sides, latter end at shielded tube 5, tube wall has two corresponding up and down 5d that laterally window that are about 3mm, and the thin light wall pipe wall of the 5d both sides of windowing forms frenulum 5e; Internal surface of sleeve pipe in the 5d the place ahead of windowing thickens, make the casing inner diameter 5f of this place less than between two of needle stand 2 leading portions vertically prominent ridge 2a apart from Z1.(in conjunction with Fig. 2).

Fig. 5 be a kind of safety venipuncture needle of the present invention from disconnected structural representation by folder 6: make by hard material or metal material by folder 6 from disconnected, be U type structure between its upper and lower plates, one circular hole is arranged in its lowest point; The plate outer rim direction corresponding with lower plate has a pair of inserted link 6a with stopper button thereon, can be inserted among the wedged hole 6b corresponding in the lower plate, forms the self-locking non-return structure; Front end correspondence at upper and lower plates respectively has an arc backing plate 6c, along with the closure of upper and lower plates is drawn close, two arc backing plate 6c can form folder close flexible pipe 3 by folder (in conjunction with Fig. 6); The upper and lower plates front end in the outside by folder a pair of mutual intersection is respectively arranged but can closely contact from disconnected

shear

6d and 6d` (they are similar to two cut-off knives of plate shearing machine or shears).

Fig. 6 is the overall structure sketch map of a kind of safety venipuncture needle of the present invention; As seen from the figure: puncture needle tubing 1 is bonded in the needle stand 2 front end endoporus, and the cutting edge end is venipuncture needle point 1a; Peg graft and adhere to an end of flexible pipe 3 in the rear end of needle stand 2; The outer puncture needle appearances that are enclosed within of spring 4, the shielded tube 5 outer appearances that are enclosed within spring 4, needle tubing 1, needle stand 2 and flexible pipe 3, and in the space of the front end that spring 4 is compressed in shielded tube 5 endoporus and needle stand 2 front ends and needle tubing 1 formation; The end of shielded tube 5 and flexible pipe 3 surfaces are by high frequency heat seal bonding (also can bond by other modes), to keep the compression to spring 4; Sheath 0 covers the front end of shielded tube 5, and 1a protects to needle tip; Two prominent ridge 2a in side of (in conjunction with Fig. 3, Fig. 4) needle stand 2 leading portions are inserted among the longitudinal groove 5c of shielded tube 5 preceding stage casing inner chambers, and needle point cutting edge 1a direction is realized horizontal location.Be sleeved on the end of shielded tube 5 by folder 6 from breaking, be combined in the last dropping window 5d of shielded tube 5 back segments by clip.Flexible pipe 3 and shielded tube 5 all are the transparent pipelines that flexible material is made, can be crooked, be convenient to clinical manipulation, and can not influence venipuncture needle endovascular fixing.

More than constitute the overall structure of a kind of safety venipuncture needle of the present invention.

Fig. 7 be a kind of safety venipuncture needle of the present invention after clinical use, the puncture needle body structure is ruined type, needle tubing 1 conductively-closed sleeve pipe 5 covers fully, is protected fully; It is closed fully that flexible pipe 3 is cut off folder, residual liquid, blood or body fluid can not excessively be trickled, the structural representation that is effectively controlled.As seen from the figure, when when clinical use (blood transfusion, infusion medicinal liquid, blood sampling, collection of body fluids specimen, puncture for treating) finishes, pinch pressure from the disconnected folder 6 that ends with finger, make its upper and lower plates closure that comes closer, the thin light wall pipe wall frenulum 5e of both sides, 5d place of shielded tube 5 can being windowed is sheared from disconnected from disconnected

shear

6d and 6d`, simultaneously the inner chamber of flexible pipe 3 is pushed closure and causes and end.Because shielded tube 5 lost involving of flexible pipe 3, under spring 4 active forces, reach rapidly, 1a covers fully with needle tip, stops with vertically the dashing forward the mutual stop limits of ridge 2a of needle stand 2 front end lateral walls until the narrowing portion 5f of shielded tube 5 back segment inwalls; Making shielded tube 5 cover needle point 1a fully and don't excessively move forward comes off.So can eliminate medical personnel by the risk of needle stick injury.(in conjunction with Fig. 5 and Fig. 6), because it is closed that flexible pipe 3 inner chambers are cut off folder, owing between the upper and lower plates stopper button 6c and wedged hole 6c` effect are arranged, make the effect of ending of above-mentioned action continue to keep, make flexible pipe inner liquid medicine, blood or body fluid excessively not to trickle, eliminate the chance of excessive pollution of pathogen and propagation, reduced the generation and the propagation of blood borne disease.

Technical scheme described in the invention, those skilled in the art by distortion any similar distortion that can realize, all will fall into technology category of the present invention.

Claims

1. safety venipuncture needle is by sheath (0), needle tubing (1), needle stand (2), flexible pipe (3), spring (4), shielded tube (5), form by folder (6) from disconnected; It is characterized in that: needle tubing (1) is pegged graft and to be cemented in the medium pore (2b) of needle stand (2) front end, needle stand (2) back segment reduced and with flexible pipe (3) grafting cementation; Shielded tube (5) is enclosed within the appearance of spring (4), needle tubing (1), needle stand (2), flexible pipe (3), and spring (4) is compressed in the space of shielded tube (5) leading portion and the formation of needle stand front end; The end of shielded tube (5) and flexible pipe (3) bond mutually by high frequency heat seal or alternate manner, keep the compression to spring (4); Be sleeved on the end of shielded tube by folder (6) from breaking, from breaking by inserting in the last dropping window (5d) of shielded tube (5) latter end of pressing from both sides from disconnected shear plate (6d, 6d`).

2. according to the said a kind of safety venipuncture needle of claim 1, it is characterized in that: there is a pair of vertical semicircle ridge (2a) of dashing forward needle stand (2) leading portion both sides, needle stand (2) hypomere is tapered to be dwindled and flexible pipe (3) grafting cementation, and makes needle point cutting edge (1a) plane parallel with the line of two vertically prominent ridges (2a).

3. according to the said a kind of safety venipuncture needle of claim 1, it is characterized in that: shielded tube (5) is a hollow structure, and its front end perforate (5a) is dwindled, and its diameter equals or big slightly needle tubing (1) external diameter; The leading portion inside diameter D 0 of shielded tube (5) is equal to or slightly greater than the external diameter of spring (4); The middle leading portion outside of shielded tube (5) has the flat structure of a transverse projections at least, forms operating grip (5b); Equal or be slightly larger than the body diameter Z of needle stand (2) leading portion at the middle leading portion intracavity diameter D of shielded tube (5); Circle sidewall in the middle leading portion of shielded tube (5), a pair of semicircle longitudinal groove (5c) is arranged, its maximum spacing D1 equals or is slightly larger than the spacing Z1 of two vertically prominent ridges (2a) of needle stand (2) leading portion lateral wall, and the plane parallel of the line of two longitudinal grooves (5c) and flat handle (5c); The posterior segment intracavity diameter D2 of shielded tube (5) is equal to or slightly greater than the spacing Z1 of two the vertically prominent ridges (2a) in needle stand (2) side, latter end in shielded tube (5), tube wall has two corresponding up and down laterally window (5d) that are about 3mm, and the thin light wall pipe wall of (5d) both sides of windowing forms frenulum (5e); Internal surface of sleeve pipe in (5d) the place ahead of windowing thickens, make this place's casing inner diameter (5f) less than between two of needle stand (2) leading portion vertically prominent ridges (2a) apart from Z1.

4. according to the said a kind of safety venipuncture needle of claim 1, it is characterized in that: make by hard material or metal material by folder (6) from disconnected, its upper and lower plates structure that takes the shape of the letter U, there is a circular hole its lowest point, flexible pipe (3) passes this hole, makes its end that is sleeved on shielded tube (5), from disconnected last front edge of board by folder (6) a pair of inserted link (6a) that has the stopper button is arranged, can insert down in the wedged hole (6b) of front edge of board, form the self-locking non-return structure; In the front center of upper and lower plates to a pair of arc backing plate (6c) should be arranged, form to flexible pipe (3) by folder; By the outside of folder, the front end of upper and lower plates a pair of mutual intersection is respectively arranged but closely contact from disconnected shear plate (6d, 6d`).