CN201996961U

CN201996961U - Safe remaining needle for transfusion

Info

Publication number: CN201996961U
Application number: CN2010202375269U
Authority: CN
Inventors: 张亚平
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-06-24
Filing date: 2010-06-24
Publication date: 2011-10-05
Anticipated expiration: 2020-06-24

Abstract

The utility model relates to a safe arteriovenous remaining needle with a needle interface-free positive pressure closed valve. A puncture needle, a puncture needle stand and a handle form a puncture needle unit; a puncture needle protection sleeve, a spring, a plunger latch and an escapement clip form a puncture needle protection assembly; a remaining needle hose, a puncture needle guide tube, a remaining needle stand and a sealing plug form the arteriovenous remaining needle; and a shell, a piston, a sealing ring, a spring, a connecting hose and a base form the needle interface-free positive pressure closed valve. Through the separate structure of the positive pressure closed valve and a liquid outlet plug, the remaining needle is not dragged, is convenient for operation, can reduce pain and is prevented from slipping; the puncture needle protection sleeve can protect the puncture needle before and after the remaining needle is used; and the remaining needle has the advantages of no increment of length, small volume, good handfeel, holding accuracy, high puncture precision, convenience for puncture operation and the like. The safe arteriovenous remaining needle can be automatically retracted to protect the puncture needle, and needling injury to the medical personnel can be avoided; the remaining needle has a positive pressure closing function, reflux and overflow of venous blood can be prevented, blood pollution is prevented, thrombus blockage of blood in the remaining needle tube is avoided, and the operations of sealing the tube with heparin and the like are not needed; and the remaining needle has needle-free connecting function, needle puncture can be avoided, the work efficiency is improved, and the safety of the medical personnel and patients is ensured.

Description

The transfusion safety indwelling needle

Technical field

This utility model relates to a kind of medical apparatus and instruments that is used for infusion liquid, a kind of specifically transfusion safety indwelling needle that is used for artery and vein puncture process and puncture back thereof indwelling phase infusion liquid in blood vessel in blood vessel.

Background technology

Transfusion almost can be imported human body by blood vessel with all medicinal liquids, realizes treatment and prophylactic purpose.In clinical, usually can be because of periodic treatment plan, repeatedly puncture vessel carries out infusion treatment.To chemotherapy, cardiovascular and cerebrovascular diseases and the children's of tumor, old people's blood vessel (sclerosis, fragility increase) puncture condition difference the time, blood vessel is damaged because of repeatedly puncturing, or due to illness the people mismatches, can increase the painful and puncture procedure difficulty of patient, even can destroy (the blood vessel injury portion after the puncture can form cicatrix, in a short time the logical again difficulty of blood flow) because of the repeatedly puncture of showing shallow blood vessel, and the use of can not puncturing once more, influence infusion treatment, finally need the deep vascular puncture, could infusion treatment.Damage that causes blood vessel for avoiding repeatedly puncturing and minimizing patient misery, also for alleviating nurse operation intensity, according to active infusion treatment theory, clinical iv cannule (pipe) technology of generally using.The iv cannule of present clinical use is made up of heparin (sealing) medicated cap, puncture needle, Paracentesis needle holder, indwelling soft tube pin, indwelling needle stand, remaining needle protective sleeve mostly.They can be finished the vascular puncture process substantially and keep somewhere the indwelling of soft tube pin in artery and vein vascular; Through clinical a large amount of practical proof, the iv cannule that uses has following many defectives and deficiency now:

The one: there are security risk in user and peripheral personnel: because the metal puncture pin will run through remaining needle, the more common puncture needle of its length is long, after puncture is pulled out, appearance is without any protection, cause medical personnel and later Biohazard Waste treatment people by pricking wound easily, have the risk that causes nosocomial infection because of the virus that contains in the bloodstain remaining on the needle tubing.

The 2nd: reaching on every side to patient, there is security risk in personnel: because it is identical with common Paracentesis needle holder structure to keep somewhere needle stand, there are not the measure or the device that prevent blood back flow (backflow), make after puncture needle is pulled out, blood can reflux, contaminated environment and (medical personnel and surrounding population) human body form security risk; Moreover, using remaining needle to repeat in the infusion process, infusion connector after each transfusion finishes is pulled out action, must make the remaining needle inner chamber form certain negative pressure, can cause blood to reflux and enter and keep somewhere in the needle tubing, blood coagulation can take place, form embolus, when reusing, because of the remaining needle passage stops up, need puncture again, can influence treatment and increase medical personnel's work; Moreover, cause the thromboembolism of this tissue or organ blood vessel if the embolus intravasation enters different tissue of human body or organ with blood flow, and the serious ischemia that causes this organ, necrosis, consequence is very serious and dangerous.

The 3rd: increase medical care labor intensity, operate loaded down with trivial details, and take place bolt stifled after, need puncture again, can increase patient's misery and burden, its application is restricted.For this reason, the remaining needle of present clinical use, its protection rules are after pulling out joint, must use a kind of helmet, the remaining needle interface is sealed, in order to prevent that blood from solidifying in keeping somewhere needle tubing, must use anticoagulant (heparin sodium aqua) again, be injected into and keep somewhere in the needle tubing, (so that this closing cover renames as calparine cap), be specifically designed to remaining needle is carried out the anticoagulant tube sealing, per 8 hours once, and record is handed over to the next shift, the strict execution.This had both increased the operation of medical workers program, had also increased patient's financial burden, also because the handicapped patient of some blood clotting can not use anticoagulant because of having haemolysis or hemorrhage risk, its application was restricted; In addition, when being carried out the anticoagulant tube sealing, remaining needle, also increased medical personnel by the danger of pricking wound owing to be to adopt acupuncture manipulation.

Chinese patent: CN200410041490.6 discloses a kind of lamellar valve that is provided with a pair of wedge shape in sleeve pipe, can prevent the iv cannule of blood back flow.Chinese patent: CN200620080001.2 discloses the another kind of excessive method of blood backflow that prevents automatically, be to be provided with sealing-plug and conducting support at the tail intracavity of keeping somewhere needle stand, rubber seal plug seal fluid runner, borrow conducting support (sleeve pipe) under external force (transfusion device or syringe or conduit socket) effect, it to be run through sealing-plug, conducting once more, but after not being set forth in sockets such as transfusion device and pulling out, the conducting support how from sealing-plug break away from, the structure of sealing once more, so this scheme can only satisfy the once use of remaining needle and fluid pipeline interface.But also only be to have prevented after puncture, prevent the adverse current of blood or liquid when pulling out puncture needle, avoid contaminated environment and operation medical personnel.Chinese patent: CN200510051051.8 discloses a kind of safety indwelling needle, makes the needle body that expands at the front end of puncture needle, limits the landing of needle point protective casing on needle point leading portion needle body with this, the technical scheme of protection needle point; Because of it only protects needle point, and needle body still exposes, and the bloodstain of being infected with on the needle body remains the serious source of infection to medical personnel.Chinese patent CN200610019956.6, CN200620162576.9, CN200610027796.5 disclose a kind of sleeve pipe that utilizes the puncture needle tail end to increase a hollow, offer longitudinal joint in the sleeve pipe one or both sides, be beneficial to the slip therein of puncture needle handle, so that after puncturing successfully, the pulling handle, puncture needle is drawn in the hollow sleeve, reached the shielding needle body, protection is by the purpose of needle stick injury.I disclose a kind of technical scheme at Paracentesis needle holder front end complex spring protective cap in Chinese patent CN200720064120.3, be when pulling out needle point after the puncture, utilize spring that protective cap is discharged outwards to stretch the needle point covering is wrapped up.The no needle adapter that directly connects a band positive-pressure closing valve in addition at the 3rd end keeping somewhere needle stand.Its advantage is to have overcome venous return to cause the stifled problem of bolt and shielded needle point; exempt the risk of needle stick injury; but; also come with some shortcomings: be exactly; though needle tip conductively-closed; but the puncture needle body but also exposes outside, exists bloodstain on the needle body to pollute the risk of human body equally with B.Braun company technical protection scheme.

Chinese patent CN200620076287.7 and CN200720018504.0 disclose two kinds of remaining needles with positive-pressure closing valve, though solved the blood reflux phenomenon when puncture needle is pulled out, can not solve the problem of puncture needle needle stick injury.

More than disclosed technical scheme all do not solve the root problem that present remaining needle exists, perhaps in the clinical manipulation process, have certain inconvenience and not enough:

1, puncture needle pulling out in the process after the vascular puncture success can not prevent effectively that blood is excessive by the blood that the needle body passage causes, thus pollution that may cause or cross infection risk; 2, the needle tip protector is incomplete or unreasonable.In above-mentioned disclosed patent, needle tubing is made and is expanded ball, though satisfied coming off of limiting protecting cover, needle tubing exists resistance or obstacle in inserting remaining needle flexible pipe and needle stand process.And the puncture needle protective sleeve that the concatenation type sleeve pipe constitutes has also increased the length of puncture needle integral body, has increased the inconvenience and the cost of operation.3, crucial also be importantly remaining needle needle stand and the socket of transfusion device or syringe or liquid infusion device peg graft infuse after, after pulling out socket, vessel inner blood is because of pulling out the negative pressure that socket forms, can cause the backflow of blood, blood enters the remaining needle flexible pipe and solidifies, remaining needle stops up, transfusion can not and cause once more, severe patient, the blood clot intravasation that comes off along with blood flow, can cause the venous thrombosis of little blood vessel, cause portion of tissue or organ ischemic necrosis, cause serious consequence.4, the needle point guard sleeve pipe has increased the length of remaining needle product at the puncture needle afterbody, all inconvenience of packing, operation.5, the front-end protection scheme of metal clip and protective cap only can be protected needle point, eliminates needle stick injury, but needle body can not be shielded fully, the risk that exists bloodstain to pollute.6, (crack in the side to increase the mode of complete protective casing at the Paracentesis needle holder tail end; be beneficial to the pumpback of puncture needle); though puncture needle can be protected fully; but owing to increased small product size and length; making puncture needle body and protecting pipe constitute the clinical manipulation process disturbs; and increased packing of product volume and improved product cost, especially operation inconvenience, influence puncture precision.

At present, also not seeing the technical scheme that can solve above-mentioned insufficient iv cannule fully both at home and abroad is disclosed.

I have narrated the iv cannule that a kind of axial I type has needleless interface positive-pressure closing valve in CN 20071003546.0, its scheme is that needleless interface positive-pressure closing valve is connected in series with I type venous detaining needle, constitutes the iv cannule with needleless interface, positive-pressure closing, security protection puncture needle function.But because needleless interface and remaining needle one, connection in operation can involve the venous detaining needle flexible pipe, causes patient's pain, can cause remaining needle to deviate from blood vessel when serious.Be not easy to operation.

I have narrated a kind of Y type iv cannule with needleless interface positive-pressure closing valve in CN200710192554.6, its scheme is that needleless interface positive-pressure closing valve is connected in series with Y type venous detaining needle, constitutes the iv cannule with needleless interface, positive-pressure closing, security protection puncture needle function.But because its puncture needle protection scheme is by spring protective casing elastic force to be discharged; the scheme that puncture needle spare is shielded; also exist other people risk of bloodstain humoral pollution that the needle tubing body is infected with; so; this scheme only can prevent needle stick injury, and can not reach real and security protection completely.

Iv cannule with needleless interface positive-pressure closing valve of the present utility model has adopted puncture needle bounce back automatically protection structure and transfusion interface isolating type structure, makes easy to manufacturely, implements simply, is beneficial to universal.

Summary of the invention

This utility model provides a kind of can solve above-mentioned insufficient transfusion safety indwelling needle.The technical scheme that this utility model provides is such: be made up of jointly bounce back automatically protective casing, needleless interface positive-pressure closing valve, remaining needle, puncture needle four parts of puncture needle.It is characterized in that: the puncture needle protective casing inside that bounces back automatically is equipped with lock bolt, retraction spring, when not using, they are enclosed within the remaining needle front end becomes the needle point protective sleeve, after puncturing successfully, the protective casing front end is pegged graft with Paracentesis needle holder again, after starting safety device, can make puncture needle retract to shielding and maintenance fully in the protective casing automatically; Spring can be limited in the puncture needle needle body can not expose in the protecting pipe after discharging.Said needleless interface positive-pressure closing valve is made up of housing, piston, sealing ring, spring, connection flexible pipe, base.The outside, upper end of said housing has screw thread to constitute the socket that spins of Rule structure, the hypomere internal diameter of housing is more than 1.2 times of epimere internal diameter, piston hypomere external diameter is more than 1.2 times of epimere external diameter, and is slipper seal by two sealing rings and the inner walls that is embedded in the piston upper and lower side groove; The epimere sidewall of piston has a through hole and communicates with the centre bore of piston hypomere, and cementation has the connection flexible pipe in the said centre bore, connects flexible pipe and passes centre hole of base and the fluid joint cementation of keeping somewhere needle stand, perhaps with fluid plug cementation; Centre hole of base constitutes the gas compensation channels; Between base and piston bottom surface, spring is arranged; During the cancellation of power effect outside, piston moves up under spring action, and the female Luer on the housing is sealed automatically, and makes the intravital liquid of shell form malleation, flows to iv cannule.Said iv cannule is by keeping somewhere needle stand, sealing-plug, puncture needle guide wire and keeping somewhere soft needle tubing and form; Keep somewhere the reducing of needle stand epimere, built-in tubaeform puncture needle guiding tube, this guiding tube hypomere slim pipe diameter is connected and fixed with indwelling flexible pipe pin; At the middle part inner chamber of keeping somewhere needle stand sealing-plug is arranged, can allow puncture needle to pass through, after puncture needle is pulled out, and keep airtight; The outer, lower end of said indwelling needle stand is shaped on a breach, to locate inserting with the puncture handle set, the remaining needle flexible pipe is made by the no-toxicity medical macromolecular material, transparent, front end is the reducing chamfering, tube cavity has several inside ridges, with the anti-flat performance of the resistance to compression that increases flexible pipe, also observes the usefulness of puncture effect along metal puncture pin outer wall and the backflow of hose inner wall gap for blood.Keeping somewhere needle stand is Y type integrative-structure or is I type integrative-structure.In the needle stand centre bore, interior needle stand front end was square in said puncture needle cemented in, cooperatively interact with the square hole of puncture handle set front end, and the rear end hollow of interior needle stand, inner edge has ring-type constriction projection, can expand mutual grafting with lock bolt head wedge shape, constitutes chain.Pinch to press the escapement folder or push protective casing forward and can start safety device, make lock bolt free locking, retracting spring, spring drive lock bolt and in needle stand puncture needle is taken in the protective casing; Along with the disengaging of interior needle stand, the puncture handle set loses support, the front end reduced diameter, and break away from the restriction of keeping somewhere needle stand, break away from voluntarily and keep somewhere needle stand.

Needleless interface positive-pressure closing valve is communicated with the indwelling needle stand by flexible pipe or fluid plug, can guarantee the certain operation mobile space in the clinical transfusion connection procedure, do not involve and the remaining needle flexible pipe is not caused, avoid causing that pain or remaining needle flexible pipe deviate from from endovascular.

The utlity model has following technical characterictic and technological progress:

Because puncture needle protective casing of the present utility model when not using, is installed in the puncture needle front end, the protection puncture needle; Take off protective casing during use, treat retained needle puncture success after, again protective casing and puncture needle are pegged graft, start safety device, the compression spring can with puncture needle automatically retraction enter in the protective casing and maintenance.In the structure of the shared protective casing in puncture front and back, do not increase the volume and the length of safety indwelling needle product, economical with materials reduces cost.Easy to manufacture, to implement simply, this remaining needle volume is small, light, is easy to fixedly carry, and is beneficial to universal.

Owing to adopted the automatic retraction puncture needle protective casing of forming by spring, lock bolt, protective casing; in piercing process, take off and temporarily need not; make it be different from the past the scheme that protective casing is installed in the puncture needle afterbody; do not increase needle length, puncture good hand touch; control accurately; puncture precision height is convenient to operation.After puncturing successfully, again protective casing and needle stand to be pegged graft, finger starts safety device, automatically puncture needle is retracted into the protective casing inner shield and fixes, and does not expose reliable and secure protection.

Because this utility model adopts separate type positive-pressure closing valve arrangement, make this utility model in application, when pulling out the transfusion plug, move up at the spring action lower piston, the liquid that is closed in the housing is pressed to vein blood vessel, can stop the backflow of blood to remaining needle, it is stifled to avoid forming the blood bolt, thereby do not need the anticoagulant tube sealing, can alleviate nurse's work, reduce medical expense.

Because this utility model has adopted the needleless interface form, interface flow is than big tens of times of pin puncture connection traffic, and the scope of application increases, and when reusing, does not need acupuncture to connect, thereby avoids the nurse by the risk of pricking wound.

Because this utility model has adopted the safety guard of automatic puncturing pin protection tube, avoided medical personnel and other people member to be punctured pricking wound and cause and infect and the danger of pathophoresis.

Because this utility model has adopted and has kept somewhere the isolating needleless interface structure of hub interface, make needleless interface be suitable for the use that is connected, and can not cause, alleviate patient's pain the involving of remaining needle flexible pipe with Y type and I type remaining needle, avoid deviating from of remaining needle, improve nursing quality.

Description of drawings

Fig. 1 is the overall appearance sketch map of this utility model transfusion with safety indwelling needle;

Fig. 2 is the remaining needle structural representation of this utility model transfusion with safety indwelling needle;

Fig. 3 is the puncture needle structural representation of this utility model transfusion with safety indwelling needle;

Fig. 4 is the puncture needle protective casing structural representation of this utility model transfusion with safety indwelling needle;

Fig. 5 is the structural representation of this utility model transfusion with the needleless interface positive-pressure closing valve of safety indwelling needle;

Fig. 6 is that this utility model transfusion uses safety indwelling needle at clinical artery and vein puncture process sketch map;

Fig. 7 is that this utility model transfusion uses safety indwelling needle in artery and vein puncture success back, with puncture needle protective casing and the structural representation of keeping somewhere needle stand grafting process;

Fig. 8 is that this utility model is infused with the automatic structural representation that bounces back and enter in the protecting pipe and be in hold mode of the puncture needle of safety indwelling needle;

Fig. 9 is that this utility model transfusion is kept somewhere the structural representation of process with safety indwelling needle in human vas;

Figure 10 is this utility model transfusion safety indwelling needle second embodiment overall appearance structural representation;

Figure 11 is that this utility model is infused with the clinical user mode structural representation of waiting to puncture of safety indwelling needle second embodiment;

Figure 12 be this utility model transfusion with safety indwelling needle second implement in artery and vein puncture success back, with puncture needle protective casing and the structural representation of keeping somewhere the needle stand docking operation;

Figure 13 is the automatic structural representation that bounces back and enter in the protecting pipe and be in hold mode of puncture needle that this utility model transfusion is implemented with safety indwelling needle second;

Figure 14 is state is kept somewhere in this utility model transfusion in blood vessel with safety indwelling needle second embodiment an overall structure sketch map.

Specific embodiment

As shown in Figure 1, this utility model is made up of four parts: puncture needle bounce back automatically protective casing assembly A, needleless interface positive-pressure closing valve W, puncture needle assembly C and indwelling needle assembly L.

As shown in Figure 2, indwelling needle assembly L of the present utility model is made of jointly remaining needle flexible pipe 2, puncture needle guiding tube 3, indwelling needle stand 4, sealing-plug 5, wherein remaining needle flexible pipe 2 is made by the no-toxicity medical macromolecular material, transparent, front end is reducing chamfering 2a, tube cavity has several inside ridge 2b, with the anti-flat performance of the resistance to compression that increases flexible pipe, also observes the usefulness of puncture effect along metal puncture pin outer wall and the backflow of hose inner wall gap for blood.As seen from the figure, remaining needle flexible pipe 2 and the hypomere slim pipe diameter 3a suit of puncture needle guiding tube 3 and bonding firm in the following stomidium 4a that keeps somewhere needle stand 4; Keep somewhere in the needle stand 4 stage casing endoporus and sealing-plug 5 is arranged its sealing; The sidewall that the Y type is kept somewhere needle stand has the flow of liquid 4b that engages in this profession, with flexible pipe 12 bondings, can with needleless interface positive-pressure closing valve assembly W UNICOM.Keep somewhere needle stand 4 belows the soft stator 4f of double-vane is installed, on the stage casing endoporus ancient piece of jade, round, flat and with a hole in its centre of indwelling needle stand 4 an annular projection 4e is arranged, be used for fixing sealing-plug 5; On the epimere inner hole wall of keeping somewhere needle stand 4, an annular groove 4c is arranged, keep somewhere the horizontal center line edge relative, upper end of needle stand 4, a breach 4d is arranged with needle stand side liquid outlet.

As shown in Figure 3, puncture needle assembly C of the present utility model is made of jointly puncture needle 1, puncture handle set 7, interior needle stand 6; Puncture needle 1 in a tubular form, its front end is sharp most advanced and sophisticated 1a, and 5-10mm place, most advanced and sophisticated below needle tubing sidewall has a side opening 1b, and the rear end of puncture needle 1 and interior needle stand centre bore 6c are adhesively fixed, there is circular hole at center at puncture handle set 7, and the aperture, lower end is equal to or greater than puncture needle protective casing front end 8a external diameter; When circular hole extends to upper semisection, dwindle being deformed into square hole 7a, the length of side of the square 6c of needle stand 6 front ends in the length of side of puncture handle set 7 epimere square hole 7a is slightly less than; Upper end outer rim at puncture handle set 7 has annular projection 7b, and the maximum gauge of upper end outer rim projection 7b equals to keep somewhere the diameter of needle stand 4 upper end endoporus; Upper semisection sidewall upper edge axis cross symmetry at puncture handle set 7 has four latasuture 7c, in a side of puncture handle set 7 a flap-like operating grip 7d is arranged, and at the substrate root of handle sheet one projection 7e is arranged.Puncture needle 1 inserts in the puncture handle set 7 with interior needle stand 6 forms complete puncture needle assembly C.(in conjunction with Fig. 2) normal operating condition, puncture handle set 7 inserts earlier to be kept somewhere in needle stand 4 holes, then puncture needle 1 being passed sealing-plug 5 is placed in the remaining needle flexible pipe 2, interior needle stand front end square body inserts in the upper end square hole of puncture handle set 7, and with square hole support expansion, make puncture handle set 7 upper end outer rim 7b expansion, chimeric with the groove 4c that keeps somewhere in needle stand 4 endoporus, simultaneously, the projection 7e of puncture handle basilar part is chimeric with the breach 4d that keeps somewhere the needle stand outer rim, keep somewhere on the needle stand 7 thereby the handle set 7 that will puncture is fixed on, and the location can not rotate.

As shown in Figure 4, puncture needle protective casing assembly A of the present utility model is made of jointly protective casing 8, spring 9, lock bolt 10, escapement folder 11; Protective casing in a tubular form, its rear end inwall has a constriction annular projection 8d, but there are two couples of symmetric and the vertical groove 8b of major axis, 8c setting-in escapement folder in its front end two side; Escapement folder 11 is the clip shape, and front end has a pair of jaw 11a, and there is the fulcrum 11b of a pair of projection at the middle part, and the rear end of escapement folder 11 is two fin shapes handle 11c that refer to handle knob; Point diameter at protective casing is reduced into 8a, can insert in the lower end endoporus of puncture handle set 7; One lock bolt 10 is arranged in protective casing 8, and its front end is wedge shape and expands the outstanding 10a of shape, in its front end outer peripheral sidewall one shallow annular groove 10c is arranged, the outside crimping in the bottom of lock bolt 10 (turning up) 10b, and it can freely move up and down in protective casing; Spring 9 is sleeved on the periphery of lock bolt 10; be installed in the protective casing; upwards compression; escapement folder 11 is sleeved among two sidewall grooves of front end 8b, the 8c of protective casing 8, spring be compressed to lock bolt is deep among the ring-shaped groove 10c that escapement folder fore paw 11a extend into locking bolt 10 can locking fixedly till the lock bolt 10.Spring 9 is compressed by lock bolt 10, and lock bolt 10 also is fixed in the front end endoporus of protective casing 8 by escapement folder 11, and makes the front end wedge shape of lock bolt 10 expand the 10a of portion to expose protective casing 8.

As shown in Figure 5, needleless interface positive-pressure closing valve assembly W of the present utility model is made of jointly connection flexible pipe 12, base W1, spring W2, piston W3, sealing ring W4a, W4b, housing W5; The outside, upper end of the housing W5 of said needleless interface positive-pressure closing valve has screw thread to constitute the socket W5a that spins of Rule structure, and to spin with the transfusion device plug, the hypomere internal diameter W5c of housing W5 is more than 1.2 times of epimere internal diameter W5b; The hypomere external diameter of piston W3 is more than 1.2 times of epimere external diameter, and adapts to be with housing W5 internal diameter and be slidingly matched; At the fluted W3c in the upper surface of piston W3, respectively there are a ring-shaped groove W3a, W3b in the upper and lower side of the piston W3 outside, and two sealing ring W4d, W4c are embedded in wherein respectively, and is with housing W5 inwall and slides up and down sealing; Through hole W3d is arranged and be communicated with at the epimere sidewall of piston W3, in piston W3 hypomere centre bore W3e, be adhesively fixed with and connect flexible pipe 12, connect the liquid outlet cementation that flexible pipe 12 passes centre hole of base W1b and Y type indwelling needle stand with piston hypomere centre bore W3e; Between piston W3 lower surface and the base W1 spring W2 is arranged; The porose W1b in base W1 center, the outer rim in the hole has two scallop hole W1a at least, and uniform distribution is that the corresponding chimeric bonding of the fan-shaped latch W5d of arc of two band barbs is fixed with housing W5 lower end at least; Base W1 centre bore W1b constitutes the gas compensation channels.

As shown in Figure 6, after iv cannule shown in Figure 2 and puncture needle shown in Figure 3 combination, again puncture needle protective casing shown in Figure 4 is sleeved on the lower end of keeping somewhere needle stand 4, needleless interface positive-pressure closing valve shown in Figure 5 is communicated with indwelling needle stand 4 by flexible pipe 12, after the assembling, just constituted transfusion of the present utility model safety indwelling needle (see figure 1); When clinical use; take off the protective casing assembly A of remaining needle front end earlier; (stand-by, do not abandon); conventional according to puncture; after the partly sterilised, the right hand is held puncture needle Handleset C, aims at blood vessel and implements venipuncture; after the success, can and connect the flexible pipe outer wall at transparent remaining needle flexible pipe and see that blood refluxes.

As shown in Figure 7; after the venipuncture success; continue to make about remaining needle flexible pipe intravasation 15mm; the right hand is the remaining needle handle fixedly; the left hand puncture needle protective casing assembly A that takes then; make the protective casing front end aim at puncture handle set rear end, with the lock bolt wedge shape expand 8a insert in the constriction ring projection of needle stand 7 rear end endoporus, form chimeric locking.

As shown in Figure 8; after finishing above-mentioned grafting process; the thumb of left hand and forefinger were pinched two fin 11c that press the escapement folder when left hand was slowly pulled out puncture needle backward; escapement folder front end calvus 11a is opened; make lock bolt 8 break away from locking; compressed spring 9 discharges rapidly; promoting the interior needle stand 6 of lock bolt 8 drives breaks away from puncture needle 1 rapidly from remaining needle flexible pipe 2; enter in the protective casing 8; because there is an annular projection 8d protective casing rear end; make lock bolt can not continue outer moving; and the inwall of the protected front end of spring front end is fixed; the length of spring 9 is greater than lock bolt 10; the length summation of interior needle stand 6 and puncture needle 1 pipe is so can make puncture needle 1 obtain shielding in protective casing 8 and keep and can not expose.

As shown in Figure 9, pull out the venous detaining needle behind the puncture needle, owing to keep somewhere the inner chamber of needle stand 4 sealing-plug 5 sealings are arranged, the Y type is kept somewhere in the side opening 4b of needle stand 4 has flexible pipe 12 to be connected with needleless interface positive-pressure closing valve assembly W, can keep the sealing of remaining needle.And treat in the infusion process at clinical connection syringe or transfusion device, with reference to Fig. 5 as can be known, revolve on the spiral interface W5a that inserts the novel needleless infusion connector of this utility model with syringe conehead or transfusion device plug in the use, under external force, piston W3 pressurized moves down, and gas is via the gas passage discharging of the centre bore W1b formation of housing W5 bottom face in the residing space of spring W2; Medicinal liquid flows into housing W5 inner chamber through the top of piston W3 groove W3c, again through piston W3 areole W3d, piston hypomere centre bore W3e, connect flexible pipe 12 after the venous detaining needle flexible pipe enters human body.Dosing or transfusion finish, pull out syringe conehead or transfusion device plug, piston W3 rapid upwards resilience under the effect of spring W2 resets, piston W3 upper end enters housing W5 epimere, sealing ring W4a and housing 5 epimeres are airtight and are slidingly matched, housing W5 goes up segment interface W5a and is closed, because sealed all the time circle W4b sealing between the hypomere of piston W3 and the hypomere W5c of housing W5, so force the liquid in piston W3 leading portion and the housing W5 hypomere space must be via the side opening W3d of piston W3, piston W3 hypomere centre bore W3e, the fluid passage row who connects flexible pipe 12 formations is to venous detaining needle, to form malleation.Simultaneously, outside air by the centre bore W1a of base W1 bottom surface to housing inner spring space compensation.

Second embodiment:

Figure 10 is the overall structure sketch map of this utility model transfusion with safety indwelling needle example two; Second embodiment of the present utility model also comprises four assemblies, they are respectively: puncture needle assembly C, puncture needle protective casing assembly A, iv cannule assembly L and needleless interface positive-pressure closing valve W, different with first embodiment is: keeping somewhere needle stand 4 no longer is Y type three end structures, but I type rising structure (pen type remaining needle) is equipped with fixing with soft fin 4f below the indwelling needle stand; Do not re-use the escapement folder on the puncture needle protective casing; The separated attitude of needleless interface positive-pressure closing valve and remaining needle is placed, and does not assemble when using, and after puncturing successfully, after puncture needle is pulled out, just needleless interface positive-pressure closing valve and indwelling needle stand is spun.

Figure 11 is clinical wait the puncture user mode structural representation of this utility model transfusion with safety indwelling needle the 2nd embodiment; As seen from the figure, puncture needle 1 is fixed in the centre bore of interior needle stand 6, interior needle stand 6 is inserted in the endoporus that is embedded in puncture handle set 7, (same Fig. 3 of its detailed structure and mutual relation, do not repeat them here), puncture needle tubing appearance at the front end of interior needle stand 6 is set with a sealing-plug 5, and the needle stand front end was to the distance of keeping somewhere the guiding puncture pipe tail end in the needle stand inner chamber in its length was equal to or greater than, and its diameter is less than or equal to the interior foursquare length of side of needle stand front end; This utility model second embodiment at first unpacks when clinical use, takes off puncture needle protective casing assembly A, and outward appearance such as Figure 11, the right hand hold the puncture handle, implements conventional venipuncture after partly sterilised, is observing blood back, and expression is punctured successfully.

Figure 12 be this utility model transfusion with safety indwelling needle second embodiment after puncture successfully, with the structural representation of puncture needle protective sleeve and indwelling needle stand grafting process; As seen from the figure; after the venipuncture success; continuing inserting needle makes about remaining needle flexible pipe intravasation 15mm; the right hand is remaining needle handle 7d fixedly; the left hand puncture needle protective casing assembly A that takes then; make protective casing front end 8a aim at puncture handle set 7 lower end endoporus, the lock bolt wedge shape that the power that applies is slightly stretched out protective casing 8 front ends expand 8a at first insert in the constriction ring projection 6b of needle stand 6 rear end endoporus, and form chimeric locking.

Figure 13 is that this utility model transfusion enters the structural representation of puncture needle protective casing with safety indwelling needle second embodiment puncture needle is bounced back automatically; as seen from the figure; after finishing Figure 12 step; protective casing 8 is continued to apply certain power, and (design is passed protective casing 1-2mm forward 40 ± 5N).Because protective casing 8 front ends have four straight slot 8e; make that protective casing 8 front end 8a are easy to be strutted by interior needle stand 6 tail end outer rims; because internal diameter protective casing 8 front inner diameter increase; the annular projection 8f diameter of protective casing endoporus front end is increased; lose confinement to lock bolt 10; lock bolt 10 is discharged; the spring 9 of compression discharges thereupon; spring force together pulls to lock bolt 10, interior needle stand 6, puncture needle 1, sealing-plug 5 rapidly the depths of protective casing 8; until spring 9 full extension, lock bolt 10 is touched the spacing annular projection 8d of protective casings 8 far-ends and is stopped.Puncture needle is shielded fully in protective casing and is kept.

Figure 14 is state is kept somewhere in this utility model transfusion in human vas with safety indwelling needle second embodiment an overall structure sketch map.As seen from the figure; after puncture needle 1 being pulled out and is shielded fully voluntarily in protective casing 8; because needle stand 6 removes in the puncture needle; the supporting role of 6 pairs of punctures of interior needle stand handle set 7 disappears; four vertical clearance gap of upper end existence because of puncture handle set 7; the projection 7b that turns up of puncture handle set 7 upper end-face edges is inwardly shunk by stress, breaks away from the restriction of keeping somewhere needle stand 4 endoporus groove 4c, keeps somewhere needle stand 4 thereby break away from voluntarily.Then, get needleless interface positive-pressure closing valve assembly W, spin fastening with the interface of keeping somewhere needle stand 4 upper ends fluid joint W6.Finish installing and using of the iv cannule with needleless interface positive-pressure closing valve of the present utility model.In clinical use, with reference to Figure 14 as can be known, revolve on the spiral interface W5a that inserts the novel needleless infusion connector of this utility model with syringe conehead or transfusion device plug in the use, under external force, piston W3 pressurized moves down, and gas is via the gas passage discharging of the centre bore W1b formation of housing W5 bottom face in the residing space of spring W2; Medicinal liquid flows into housing W5 inner chamber through the top of piston W3 groove W3c, again through piston W3 areole W3d, piston hypomere centre bore W3e, connect flexible pipe 12 after the venous detaining needle flexible pipe enters human body.Dosing or transfusion finish, pull out syringe conehead or transfusion device plug, piston W3 rapid upwards resilience under the effect of spring W2 resets, piston W3 upper end enters housing W5 epimere, sealing ring W4a and housing 5 epimeres are airtight and are slidingly matched, housing W5 goes up segment interface W5a and is closed, because sealed all the time circle W4b sealing between the hypomere of piston W3 and the hypomere W5c of housing W5, so force the liquid in piston W3 leading portion and the housing W5 hypomere space must be via the side opening W3d of piston W3, piston W3 hypomere centre bore W3e, the fluid passage row who connects flexible pipe 12 formations is to venous detaining needle, to form malleation.Simultaneously, outside air by the centre bore W1a of base W1 bottom surface to housing inner spring space compensation.The needleless interface positive-pressure closing valve piston portion be returned to Fig. 5 shown in closed state.

Because the structure that this utility model device has adopted equal diameter piston not to move back and forth up and down in housing, can change the size of piston and housing hypomere cavity volume, make this joint valve when closing, push liquid and produce malleation by moving on the piston.

Because application of the present utility model when puncture needle is pulled out, can be wrapped in needle tip automatically in the needle point protective casing rapidly, thereby avoid medical personnel to be infected and cause the danger of pathophoresis by pricking wound; Because this utility model has needleless interface positive-pressure closing valve, make when liquid infusion end repeatedly, plug liquid plug produces malleation automatically, the liquid extruding to keeping somewhere needle tubing, is rinsed well the needle tubing inner blood, and anti-Trostin M bolt is stifled, thereby do not need to use heparin in sealing, also remove the manual pipe sealing loaded down with trivial details operation of medical personnel, can reduce medical expense, reduced patient's misery.

Claims

1. a transfusion safety indwelling needle is made of jointly puncture needle, needleless interface positive-pressure closing valve, iv cannule, the automatic protective casing of puncture needle; It is characterized in that: protective casing (8), spring (9), lock bolt (10), escapement folder (11) constitute puncture needle protective casing assembly (A) jointly; Again

Housing (W5), base (W1) and piston (W3), sealing ring (4a), (4d), spring (W2) in it constitutes space and be connected flexible pipe (12), fluid joint (W6) constitutes needleless interface positive-pressure closing valve assembly (W) jointly; Again

Remaining needle flexible pipe (2), puncture needle guiding tube (3), indwelling needle stand (4), sealing-plug (5) constitute iv cannule assembly (L) jointly; Again

Puncture needle (1), interior needle stand (6), puncture handle set (7) constitute puncture needle assembly (C) jointly.

2. according to the said a kind of transfusion safety indwelling needle of claim 1; it is characterized in that: the spring (9) in the said protective casing assembly (A), be sleeved on the periphery of lock bolt (10); and the interior intracavity of the front end that is compressed in protective casing (8) is locked, and the locking form realizes groove (10c) lock ring on lock bolt (10) the periphery ancient piece of jade, round, flat and with a hole in its centre to the lock ring of lock bolt (10) periphery ancient piece of jade, round, flat and with a hole in its centre upper groove (10c) or by the constriction raised ring (8f) of protective casing (8) front end endoporus by a pair of fore paw (11a) of escapement folder (11).

3. according to the said a kind of transfusion safety indwelling needle of claim 1; it is characterized in that: the puncture needle (1) in the puncture needle assembly (C) cements in the centre bore (6c) of interior needle stand (6); the front end of interior needle stand (6) be square (6a); the rear end inner edge of interior needle stand (6) has the annular projection (6b) of constriction, and interior needle stand (6) rear end external diameter is slightly larger than the external diameter of protective casing (8) front end (8a).

4. according to the said a kind of transfusion safety indwelling needle of claim 1; it is characterized in that: the upper end outer rim of the puncture handle set (7) in the puncture needle assembly (C) has annular projection (7b); upper end outer rim projection (7b) maximum gauge is less than or equal to the diameter of keeping somewhere needle stand (4) lower end endoporus; the upper semisection of puncture handle set (7) has decussation slit (7c) along axis; there is circular hole at center at puncture handle set (7); the aperture, lower end of circular hole is greater than puncture needle protective casing front end (8a) external diameter; the upper semisection constriction of circular hole is deformed into square hole (7a); puncture handle set (7) epimere square hole (7a) length of side is slightly less than the length of side of interior needle stand (6) front end square (6c); side outer rim at puncture handle set (7) has flap-like operating grip (7d), at the basilar part of handle one projection (7e) is arranged.

5. according to the said a kind of transfusion safety indwelling needle of claim 1, it is characterized in that: be shaped on depression breach (4d) in lower edge one side of keeping somewhere needle stand (4), can be chimeric with the projection (7e) of puncture handle set (7) handle basilar part, finish restriction to the puncture needle edge direction, at the middle part inwall of keeping somewhere needle stand (4) endoporus one annular projection (4e) is arranged, be used for restriction and fixing seal plug (5), an ancient piece of jade, round, flat and with a hole in its centre has an annular groove (4c) in the postmedian of keeping somewhere needle stand (4) endoporus, can be corresponding chimeric with the projection (7b) of puncture handle set (7) upper end outer rim, in middle part one side of keeping somewhere needle stand (4) flow of liquid engage in this profession (4b) can be arranged, constitute Y type remaining needle holder structure, can not have this flow of liquid to engage in this profession yet, thereby constitute I type remaining needle holder structure.

6. according to the said a kind of transfusion safety indwelling needle of claim 1, it is characterized in that: needleless interface positive-pressure closing valve assembly (W) is by connecting flexible pipe (12) or being communicated with indwelling needle stand (4) by the fluid joint (W6) that connects the flexible pipe front end.

7. according to the said a kind of transfusion safety indwelling needle of claim 5; it is characterized in that: in the Y type is kept somewhere needle stand (4); sealing-plug (5) diameter is more than or equal to keeping somewhere needle stand (4) upper end diameter of bore; inner hole projection (4c) is fastened on keeps somewhere in the needle stand, and protective casing 8 front end inner hole wall upper process (8f) diameters are less than the diameter of lock bolt (10) front end groove (10c).

8. according to the said a kind of transfusion safety indwelling needle of claim 1, it is characterized in that: in the I type is kept somewhere needle stand (4), sealing-plug (5) diameter is equal to or less than the length of side of interior needle stand (6) front end square body (6a), and the length of sealing-plug (5) is more than or equal to the distance of interior needle stand front end to the puncture needle guiding tube.

9. according to the said a kind of transfusion safety indwelling needle of claim 1, it is characterized in that: the front end of lock bolt is wedge shape and expands protuberance (10a), chimeric with the rear end endoporus constriction annular projection (6b) of interior needle stand (6), the back edge of lock bolt (10) turns up and rolls (10b), carries spring (9) in order to holder.