CN209377630U - A kind of intravascular memory metal puncture needle - Google Patents

Abstract

The utility model relates to a kind of intravascular memory metal puncture needles, the puncture needle include can open and close divide valvular structure and the hollow metallic coil containing multiple spiral coils, valvular structure and metallic coil is divided to be made of memory metal, this divides valvular structure to be made of multiple conical lobes；When temperature is T1, the screw pitch in metallic coil between two neighboring spiral coil reduces, and each conical lobe divided in valvular structure is closed；When temperature is T0, the screw pitch in metallic coil between two neighboring spiral coil increases, and each conical lobe divided in valvular structure is opened.The puncture needle realizes synergistic action effect, so that it can well walk in the blood vessel and precisely pierce through vascular wall, and realizes that efficient sampling carries out biopsy by cooperating metallic coil with valvular structure is divided.

Description

A kind of intravascular memory metal puncture needle

Technical field

The utility model relates to a kind of the field of medical instrument technology, and in particular to a kind of intravascular memory metal puncture needle.

Background technique

With the continuous improvement of detection methods and method, the accuracy of diagnosing tumor is gradually increased, but still is had very one big Point tumour does not have typical Imaging Features, difficult diagnosis.Correctly diagnosis needs clinical, image and pathology three to combine.Its In, pathological diagnosis plays key effect to the selection of therapeutic scheme.Aspiration biopsy is to obtain the main path of pathological diagnosis.It punctures The method of biopsy (needling biopsy, also known as needle puncture biopsy puncture biopsy) by tumour cell extract in vitro into Row analysis.Its advantage is that: method is easy, can carry out under local anaesthesia in outpatient service, in CT, MRI ultrasound and guide of fluoroscopy knit stitch Thorn biopsy success rate can greatly improve.But aspiration biopsy is directly worn without flexible puncture needle by body surface by hard Thorn is to tumor locus, and when tumour is in internal deep part or is in rich blood vessel position, puncture needle is easy normal to patient Tissue causes damage or bleeding, and patient is also more painful and has fear.

Currently, Seldinger arterial cannulation technology is highly developed.The technology clinical medical imaging (X-ray, CT, MR, B-us etc.) guidance under, by percutaneous puncture vascular routes or the original duct of human body, by fining devices such as special conduit, seal wires Tool is inserted to diseased region and carries out diagnostic radiography and treatment.The technology enters blood vessel using wire guide percutaneous puncture vascular routes Diseased region is arrived at, this method is easy to operate, damage is small, without suturing blood vessel, completely instead of previous surgical incision exposure blood The method of pipe becomes the basic operation technology of modern interventional radiology, in shining for blood embolization and drug infusion, intra-arterial for tumour Penetrate, the prevention of radioactive damage, chemotherapy, Arterial embolization tumor vessel, the perfusions such as vasoactive drug and alcohol achieve compared with Good effect.

The utility model constitutes intravascular puncture needle using memory metal, which is intubated skill by Seldinger Art, interventional guide wire guidance under enter tumor locus, by memory metal shape distortion be it is needle-shaped, realization tumor locus is worn Thorn, and extracted out tumour cell by the conduit in puncture needle.Compared with traditional puncture needle, the present apparatus has to normal group of patient It knits and damages the feature small, bleeding probability is low, patient is substantially painless.

And although seemed simply by entering the method that tumor tissues are sampled across blood vessel, but difficulty actually is very big, This is because intracorporal tumour has certain depth, it is desirable to pass through blood vessel and reach tumour, then needing across one two meters of length Blood vessel, and the thickness of blood vessel is different, the thin and thick of wall is different, endovascular environment is complicated, therefore, for conduit for puncturing The requirement on head is high, careless slightly just to pass through so long vascular environment at all.

During biopsy sampling, piercing needle is the component of extremely critical property, because of operator's hand held body outer end, And blood vessel sampling is then needed by 1-2 meters of long blood vessels, then is sampled with piercing needle, therefore, is come across so remote distance Precisely, easily operation piercing needle passes through blood vessel, pierces through vascular wall, is non-into the difficulty being sampled in tumor tissues Chang great, the requirement to piercing needle are high.Moreover, passing through blood vessel and puncturing, natively there is many contradictory places, such as: It needs to avoid that blood vessel is caused to damage when across blood vessel, and punctures and be required to precisely stab tumor tissues.

And this piercing needle should avoid damaging blood vessel during vascular puncture, can accurately pierce through tumour wall again It is sampled in blood vessel and entrance tumour wall tissue.

Utility model content

In view of this, solving existing skill the purpose of the utility model is to provide a kind of intravascular memory metal puncture needle Deficiency present in art.

The purpose of this utility model is to be achieved through the following technical solutions:

A kind of intravascular memory metal puncture needle, the puncture needle include can open and close divide valvular structure and containing more The hollow metallic coil of a spiral coil, divides valvular structure and metallic coil to be made of memory metal, this divides petaloid knot Structure is made of multiple conical lobes；

When temperature is T1, the screw pitch in metallic coil between two neighboring spiral coil reduces, and divides in valvular structure Each conical lobe closure, this divides valvular structure in cone shape structure so that its intensity increase can pierce through vascular wall；

When temperature is T0, the screw pitch in metallic coil between two neighboring spiral coil increases so that its flexibility enhances And blood vessel middle and long distance can flexibly walk in vivo, and divide each conical lobe in valvular structure to open so that in application Jie Entering seal wire may pass through wherein, this divides valvular structure to be the cylindrical-shaped structure for containing multiple tapered indentations on wall, and the circle after opening The center of column structure is open cavity structure.

Further, described major diameter one end for dividing valvular structure and metallic coil integrally connected, the conical lobe are The conical lobe that each equal curvature of point is consistent thereon, is made of arcwall face.

Further, the shapes and sizes of all conical lobes are consistent.

Further, when temperature is T1, two neighboring spiral coil is closely formd by being combined in metallic coil More closed structure, each conical lobe closure, and in two neighboring conical lobe, two sides close to each other are closely leaned on It closes, this divides valvular structure to constitute totally enclosed cone shape structure.

Further, when temperature is T0, when each conical lobe is opened, divide valvular structure everywhere substantially uniform-diameter, And it is substantially uniform-diameter with metallic coil.

Further, the conical lobe includes tail end and tip, and by tail end to tip, its width is sequentially reduced, when each cone When shape valve is closed, the diameter of tail end is greater than the diameter at tip；

Temperature T0 is 37 DEG C, and temperature T1 is 5 DEG C.

Further, the width b that the shape memory alloy of spiral coil is made is 0.3-1mm, (the T0 temperature when spiral coil unclamps When spending), the gap c between two neighboring spiral coil is 0.05-0.2mm；(the T1 temperature when the screw pitch in metallic coil reduces When spending), the gap c between two neighboring spiral coil is less than 0.001mm or even seamless to be ok.

Further, the length of metallic coil is 4-10mm；The length of described point of valvular structure is 3~10mm, divides valve When shape structure is opened, outer diameter 0.4mm, internal diameter 0.3mm.

The utility model provides a kind of intravascular memory metal puncture needle, which mainly has the effect that

Firstly, being using the one of important function of memorial alloy puncture needle: during passing through blood vessel, dividing valve Shape structure is open, and passes through interventional guide wire among it, then each conical lobe is attached on the outer wall of interventional guide wire, is being run through Cheng Zhong hardly generates any damage to blood vessel；It is intracorporal after piercing through in position when reaching, it can be by changing it It is needle-shaped or cone-shaped that the temperature of puncture needle forms its closure, and intensity and hardness greatly improve, then multiple conical lobes cooperate Effect can be easy to pierce through vascular wall, as pierced through tumor vessel and entering in tumor tissues, facilitate and carry out biopsy sampling.It should Structure feature very good solution requires to avoid damage to blood vessel and need sharp piercing in biopsy sampling in the blood vessel Contradiction.Therefore the structure that the memorial alloy of puncture needle is constituted makes it have the puncture of good passability and tissue in the blood vessels Property.

Secondly, another important result using the memorial alloy puncture needle is: being sampled if biopsy, be then pierced into tumour etc. After organization internal, stop the physiological saline of injection T1 temperature, puncture needle is gradually recovered open configuration, then the outer handheld terminal of operating body Keep puncture needle rotation or small range mobile, due to the tapered structure of multiple conical lobes, therefore these conical lobes opened can be to swollen Tumor tissue generates small-scale agitation destruction, so that more more effective tumor tissues can be more got when sampling, thus Keep the effect of biopsy more preferably more accurate.Therefore, by cleverly memorial alloy being used to enable puncture needle in opening and closing Between change, to being realized well across intracorporal long blood vessel, pierce through tumor vessel and to enter tumor tissues, auxiliary effective Biopsy sampling etc. processes.

For metallic coil in the application when spiral coil unclamps, with some strength, flexibility is big It is big to increase, it is convenient flexibly to walk over long distances and in sinuate blood vessel；When spiral coil closely by being combined when, it is flexible Property reduce, intensity greatly increases, can with divide valvular structure cooperation realize the puncture of blood vessel and enter in tumor tissues into Row sampling biopsy.

Therefore, the utility model realizes synergistic action effect, makes by cooperating metallic coil with valvular structure is divided Obtaining it preferably realizes above-mentioned two purpose or effect, in addition, other additional technical features are to the technical program It advanced optimizes, these technical characteristics are interaction, synergistic effect, realize in the blood vessel smoothly walking jointly, to blood vessel The injury tolerance of wall is low, tumor vascular wall can be pierced through easily and can smoothly enter into tumor tissues and be able to carry out it is good, have The sampling of effect, it is final to realize more accurately biopsy effect.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of puncture needle described in the utility model embodiment 1；

Fig. 2 is structural schematic diagram when dividing valvular structure to open described in the utility model embodiment 1；

Fig. 3 is structural schematic diagram when dividing valvular structure to be closed described in the utility model embodiment 1；

Fig. 4 is that the structure of the puncture needle described in the utility model embodiment 1 at a temperature of T1 containing metallic coil is shown It is intended to；

Fig. 5 is structural schematic diagram when puncturing needle open described in the utility model embodiment 1；

Fig. 6 is structural schematic diagram when being inserted into interventional guide wire in the utility model embodiment 1 at a temperature of T0；

Fig. 7 is structural schematic diagram when being inserted into interventional guide wire in the utility model embodiment 1 at a temperature of T1；

Fig. 8 is cross-sectional view when dividing valvular structure closed together described in the utility model embodiment 2；

Fig. 9 is cross-sectional view when dividing valvular structure to open described in the utility model embodiment 2；

Structural representation when Figure 10 is the piercing needle application after being inserted into interventional guide wire described in the utility model embodiment 4 Figure.

In figure, 1, divide valvular structure, 2, metallic coil, 9, interventional guide wire, 100, conical lobe, 101, tail end, 102, point End, 103, long tube, 104, annular ring, 105, inclined-plane.

Specific embodiment

The technical scheme in the utility model embodiment is clearly and completely described below, it is clear that described reality Applying example is the utility model a part of the embodiment, instead of all the embodiments.The embodiments of the present invention presented below Detailed description be not intended to limit the range of claimed invention, but be merely representative of the selected of the utility model Embodiment.Based on the embodiments of the present invention, this field commonsense method personnel are without creative efforts Every other embodiment obtained, fall within the protection scope of the utility model.

Embodiment 1

A kind of intravascular memory metal puncture needle, as shown in Fig. 1,4-5, the puncture needle includes point petaloid that can be opened and closed Structure 1 and the internal metallic coil 2 for cavity, divide valvular structure 1 and metallic coil 2 to be made of memory metal, described Memory metal includes but is not limited to Nitinol, corronil, albronze, ormolu etc..

As Figure 2-3, this divides valvular structure 1 to be made of multiple conical lobes 100, and conical lobe 100 can be identical More valve conical lobes, or it is different but no matter identical or not identical, divide valvular structure 1 that can have following knot Structure feature: when each conical lobe closure, as shown in Fig. 3, this divides valvular structure to be cone shape structure, and as one end is big The diameter other end is the acicular texture of minor diameter；When each conical lobe is opened, as shown in Fig. 2, this divides valvular structure for circle Column structure, and contain multiple tapered indentations on the wall of the cylindrical-shaped structure, the center of the cylindrical-shaped structure is open cavity Structure facilitates interventional guide wire etc. to pass through.

As shown in figure 3, the conical lobe 100 includes tail end 101 and tip 102, by tail end 101 to its width of tip 102 It is sequentially reduced, when each conical lobe closure, the diameter of tail end 101 is greater than the diameter at tip.

Metallic coil 2 is connect with the larger diameter end (i.e. tail end 101) of valvular structure 1 is divided, both preferably integrally connected or It is integrally formed, firmness or intensity are higher, and using effect is more preferable.

Due to being made of shape memory metal, therefore valvular structure is divided to be closing or opening of being occurred according to temperature change Deformation；Such as: when temperature is T0, valvular structure is divided to open, when temperature is T1, divide valvular structure close up to be formed it is needle-shaped, i.e., it is round Cone-like structure；Temperature T0 may be set to 37 degrees Celsius, and T1 may be set to 5 degrees Celsius.

Similarly, as above-mentioned metallic coil 2 be the metallic coil made of memorial alloy, when temperature be T0 when, The screw pitch of two neighboring spiral coil increases in metallic coil 2, and diameter also accordingly increases, outer diameter about 0.35-0.45mm, such as 0.4mm, flexibility increases while which makes it have certain rigidity, is suitable for the blood vessel across long range, meanwhile, in T0 At a temperature of, dividing valvular structure 1 also is the state opened, as shown in Figure 1；When temperature is T1, the screw pitch in metallic coil subtracts Small, diameter also reduces accordingly, outer diameter about 0.3-0.4mm, such as 0.35mm, 0.38mm, meanwhile, at a temperature of T1, point Valvular structure 1 is also the state of closure, facilitates puncture vascular wall, as shown in figure 4, two neighboring spiral coil is by being combined, Flexibility reduces, and intensity increases.

As further preferred embodiment, the metallic coil 2 on memory metal pipe also for by being swashed Light cuts the helical structure to form helical form joint-cutting, to make it have some strength while increase certain flexibility, does not have Telescopic resilience power has essential difference with spring, and the effect of metallic coil 2 in the present embodiment all cannot be achieved in any spring.

As further preferred embodiment, the length of metallic coil 2 is 4-10mm, such as 5mm, 6mm, 7mm, 8mm Deng, when spiral coil unclamps, outer diameter 0.4mm, internal diameter 0.3mm.

Metallic coil with a thickness of 0.1~0.2mm, such as 0.1mm, 0.15mm or 0.2mm, thickness is for intensity and flexible The coordination of property is also extremely important, it is too thick or too it is thin all may walking to puncture needle or intensity impact.In metallic coil 2 Screw pitch increase when, length can be slightly elongated, screw pitch reduce when, length slightly becomes smaller, but all in above-mentioned length range.

The length of described point of valvular structure is 3~10mm, such as 5mm, and when valvular structure being divided to open, outer diameter 0.4mm is interior Diameter is 0.3mm.

As further preferred embodiment, in metallic coil 2, the width b of the shape memory alloy of spiral coil is made For 0.3-1mm, width b is too big, and then its flexibility will receive influence, walk in blood vessel having many bends or curves over long distances to will affect Flexibility, the too small then intensity of width b is inadequate, can not carry out passing through blood vessel over long distances and reach tumor tissues, spiral coil unclamps When (when T0 temperature), gap c between two neighboring spiral coil is 0.05-0.2mm, and gap c is too big, and then its intensity is inadequate, too It is small then flexible inadequate, as shown in figure 5, therefore, the specification of b and c are critically important, only matching in the effective of reasonable width b and gap c Under conjunction, it is more stable, quick in long body vessel that piercing needle can be made, and accurately reach the blood vessel of tumour In.When the screw pitch in metallic coil reduces (when T1 temperature), gap c between two neighboring spiral coil be less than It 0.001mm or even seamless is ok.

It is preferred that the screw pitch in metallic coil 2 reduces, and the two neighboring close closing of spiral coil is one when temperature is T1 It rises, intensity greatly increases.

As further preferred embodiment, the conical lobe is the consistent arcwall face of each equal curvature of point thereon, then So that forming the external acicular texture for being exactly cone shape after each conical lobe is all closed；Keep score valvular structure 1 each Place's stress is consistent, and intravascular walking is easier, and injury tolerance is smaller.

As further preferred embodiment, the shapes and sizes of all conical lobes 100 are consistent, i.e., preferably each A conical lobe 100 is just the same, then when all conical lobes 100 all after, just make the active force of each conical lobe or hold Stress is consistent, then after dividing valvular structure to be closed, the dynamics of acicular texture is stronger, can accurately be pierced into very much tumor group In knitting, biopsy sampling is more convenient, and using effect is good.

As further preferred embodiment, when each conical lobe 100 closure, in two neighboring conical lobe 100 Two close closings in side close to each other, i.e., substantially seamless gap between two neighboring conical lobe, this divides valvular structure to constitute Totally enclosed cone shape structure.Mutually close closing then makes the intensity of formed conical structure higher, to tissue It pierces through effect to be more preferably easier, usability is stronger；And tight closure, keep its sealing effect good, makes in injection low-temperature normal saline After it is closed, just only needing to continue to inject a small amount of physiological saline can make its maintenance continue the state of closure, so as to have enough Time pierce through tumor vessel and enter tumor tissues inside.

As further preferred embodiment, divide in valvular structure containing 2-5 conical lobe, preferably 3 conical lobes or 4 A conical lobe；Valve number is very little, unstable to the package power of the interventional guide wire all directions of tubulose, and effect of walking in the blood vessel is owed Good, then each conical lobe is too small too much for valve number, and intensity is not achieved.

In use, as shown in fig. 6-7, the metallic coil 2 of the puncture needle in the utility model can be connect with long tube, Long tube 103 can be metal blank pipe, plastics blank pipe, the helix tube of metal material, hypotube etc..The length of long tube needs 1- 2m long, to facilitate it to enter in in-vivo tumour tissue by intracorporal blood vessel.

When specifically used, the free end of metallic coil 2 is fixedly connected with (such as laser welding) with long tube 103, works as temperature When degree is T0 (such as 37 DEG C), the screw pitch of metallic coil 2 is more loose, contains gap between the screw pitch between two neighboring spiral coil, Flexibility is good, divides valvular structure also open-shaped state, and interventional guide wire 9 is penetrated from the free end of long tube, then from metallic coil 2 It is pierced by with dividing in valvular structure 1, is equivalent to each conical lobe 100 and is wrapped on the lateral wall of interventional guide wire, as shown in Figure 6 (for Attached drawing is clear, and the length of long tube is drawn shorter), due in metallic coil 2 between the width and spiral coil of memory metal sheet Gap it is appropriate, intensity and flexibility required for can keeping simultaneously pass through blood vessel up to 1-2m, reach intracorporal swollen At tumor tissue.Then interventional guide wire is extracted out, then by that the physiological saline of T1 temperature (such as 5 DEG C) will be injected into puncture inside long tube Needle section makes metallic coil and valvular structure is divided to be cooled to T1, then the screw pitch in metallic coil becomes smaller, and hardness improves, together Each conical lobe 100 in time-division valvular structure 1 is closed together to form acicular texture or cone-shaped structure, as shown in fig. 7, The metallic coil then tightened divides valvular structure to cooperate with closure, and intensity is very high, can accurately penetrate tumour easily Internal blood vessel enters inside tumor tissues.Into after inside tumor, stop injection T1 temperature physiological saline, piercing needle by Gradually recovery temperature T0, metallic coil screw pitch become larger, and the more valve structures of memorial alloy open.Finally pass through syringe or other devices again Tool passes through piercing needle extraction inside tumor tissue fluid and tumour cell.

After physiological saline due to stopping injection T1 temperature, with the promotion of temperature, each conical lobe is opened, after opening Each conical lobe since its front end is tip, therefore rotate piercing needle or slightly mobile, then multiple conical lobes are total to It is further pricked broken or is blended with piercing or agitaion, the tissue that position has been damaged, make the block of tumor tissues Shape structure is destroyed by small range, then when facilitating and take out the tissue of this part, therefore extracting inside tumor tissue fluid and tumour cell, Effective tissue and effective amount can be got to be detected, it is ensured that the success rate of later period biopsy.

Embodiment 2

On the basis of embodiment 1, as Figure 8-9, in conical lobe 100, for the closing of adjacent conical valve or point The side opened is inclined-plane 105, i.e. there are two sides for a conical lobe 100, and each side is bevel structure.And all conical lobes 105 direction of inclined-plane in 100 is consistent, i.e., consistent by direction clockwise or counterclockwise, then ensures two neighboring conical lobe In mutually closing two inclined-planes can just to being combined, i.e., one gradually to tilt from the inside, one is from outer Portion slopes inwardly, then the two can be combined together just, so that being smooth to its rear the inner surface and the outer surface is combined Arcwall face.

It is designed as bevel structure, the width for being equivalent to side broadens, then when making mutual closing in two neighboring conical lobe Contact area increase, then divide valvular structure 1 be closed after, the bond strength between each conical lobe 100 is bigger, is showed The puncture effect of acicular texture out is more preferable.Importantly, since side is designed as inclined-plane 105, so that two neighboring cone Contact width when shape 100 mutual closing of valve increases, therefore after closure, it is not easy to so that physiological saline is spread to outside, then can Substantially reduce the injection rate of physiological saline.

Embodiment 3

On the basis of embodiment 1 or 2, in conical lobe 100, with the closing of adjacent conical valve or the side or inclined-plane that separate 105 are equipped with the first flexible layer so that the bonding strength more high leakproofness between conical lobe 100 is more preferable, and better tightness can prolong Long needle-shaped or cone shape structure time, so that biopsy sampling is more convenient.

As further preferred embodiment, the medial surface at the tip of the conical lobe is equipped with the second flexible layer so as to divide It is higher by resultant force intensity between conical lobe when valvular structure is closed, better tightness, and be situated between when dividing to pass through inside valvular structure The binding force enhancing integraty for entering seal wire Shi Qiyu interventional guide wire increases operating effect well.

The thickness of first flexible layer and the second flexible layer can be 0.005-0.04mm, the first flexible layer and the second flexible layer Material can be polytetrafluoroethylene (PTFE) etc..

Embodiment 4

A kind of application of intravascular memory metal puncture needle, system vascular wall in human body punctures and blood vessel, group Knit the application punctured in sampling；The application method is as follows:

(1) in temperature T0, screw pitch in metallic coil increases, and valvular structure is divided to open, then by interventional guide wire from The free end of guiding tube penetrates, and passes through metallic coil, is finally pierced by make the structure from open dividing in valvular structure It walks in blood vessel in vivo；

(2) when reaching the position wait pierce through, interventional guide wire is released, syringe is penetrated from long tube, injection needle After head reaches puncture needle, to metallic coil and the physiological saline for dividing injection T1 temperature at valvular structure, T1 is 5 DEG C；With life The injection of salt water is managed, the temperature of puncture needle is gradually reduced, when dropping to⁵DEG C when, the screw pitch in metallic coil gradually becomes smaller, point Valvular structure is gradually closed, then the application that can be punctured and be sampled.

Application in human body in vascular wall puncture: for anywhere being punctured in human body any vessels, mesh Can be detection, treatment, observation situation or check and etc..It, then can be by piercing through correspondingly if there is extravasated blood in certain places The vascular wall of side is dispersed to the extravasated blood that can not be absorbed in tissue etc. and realizes that extravasated blood is eliminated.

Application in blood vessel, tissue penetration sampling: it is to enter tissue or intraorganic blood vessel by blood vessel, is then pierced through The blood vessel enters in tissue or organ, such as pierces through intratumoral vasculature and enters progress biopsy or detection sampling in tumor tissues.

Puncture in the present embodiment thinks that the puncture of blood vessel or tissue or organ, the puncture are the blood of human body depths substantially The puncture of pipe or tissue or organ, because being all easy at human body table, method or technique in the prior art be can be achieved with, Only human body depths is just least easy to be most troublesome, so the application can act on the blood vessel, tissue, organ of human body depths.When So, when in use, puncture needle needs are attached with long tube, then penetrate guiding tube wherein.

Embodiment 5

In order to further study the practical function of the piercing needle in the utility model, the applicant is from the blood vessel passed through Type and length, crossing time, to multiple latitudes such as the injury tolerance of blood vessel, the dynamics at tip, the time of sampling and precision into Research is gone.

Method: enter for liver neoplasm sampling biopsy: by Seldinger arteriopuncture technology, in irradiation image Under guidance, at a temperature of T0 (such as 37 degrees Celsius), interventional guide wire is passed through into piercing needle, usual guide wire is from the cavity of long tube Across again from dividing the centre of valvular structure to be pierced by, then in guide wire, long tube and under dividing the mating reaction of valvular structure, via stock Artery enters liver artery, then enters liver vessel from liver artery, eventually enters into inside tumor blood vessel.Extract interventional guide wire out, At a temperature of T1 (such as 5 degrees Celsius), piercing needle is pierced through into inside tumor blood vessel and is entered in tumor tissues, injection is then stopped The physiological saline of T1 temperature, temperature are increased to T0 temperature, and piercing needle is opened, and are then sampled, with taken tumor tissues or Tissue fluid etc. carries out biopsy test.

In the above process, the vascular group of process: femoral artery-liver artery-liver vessel-inside tumor blood vessel；

The length of vessel passed through: 1.6 meters.

Tested the piercing needle in embodiment 1-3 as experimental group 1-3, finally measure its crossing time, To the injury tolerance of blood vessel, the dynamics at tip, the time of sampling and precision etc..

Comparative example 1: only with the valvular structure that divides in embodiment 1, no metallic coil, in use, dividing valvular structure Tail end is directly connect with long tube, as shown in Figure 10.

Comparative example 2: the width b that the shape memory alloy of spiral coil is made in embodiment 1 is changed into 2mm, spiral coil unclamps When (when T0 temperature), gap c between two neighboring spiral coil is 1mm.

Comparative example 3: the width b that the shape memory alloy of spiral coil is made in embodiment 1 is changed into 0.1mm, spiral coil pine When opening when T0 temperature (i.e.), the gap c between two neighboring spiral coil is 1mm.

Comparative example 4: circular cone three-dimensional-structure when dividing valvular structure to be closed instead the structure in embodiment 1, and do not use Memorial alloy, therefore no matter penetrating vascular process or being pierced into the process of tumor tissues is cone-shaped structure.Across vascular process In, interventional guide wire can not spread out of taper structure, therefore its inside for being against cone-shaped structure.And metallic coil and embodiment 1 Unanimously.

Comparative example 5: structure when dividing valvular structure to open instead the structure in embodiment 1, and memorial alloy is not used, Therefore no matter penetrating vascular process or being pierced into the process of tumor tissues is the process of each conical lobe opening.Across vascular process In, interventional guide wire is pierced by taper structure, is also the process that more valve conical lobes are opened when being pierced into tumor tissues.And metallic coil It is consistent with embodiment 1.

Comparative example 6: the memory metal helix tube in embodiment 1 is changed to flexibility and the consistent bullet of memory metal helix tube Spring, and the non-memory alloy of spring is made, the spring is consistent with intensity of metallic coil at a temperature of T0 in embodiment 3.

Comparative example 7: the memory metal helix tube in embodiment 1 is changed to spring, and the non-memory alloy of spring is made, the bullet Spring is consistent with intensity of metallic coil at a temperature of T1 in embodiment 3.

For being summarized as follows shown in table for the above test group.

In upper table, 1) reaching the tumor vascular time refers in the case where long tube is completely the same, each embodiment Blood vessel, which is passed through, with comparative example reaches the time required for tumor tissues；2) injury tolerance of blood vessel is referred to drawing internal blood vessel The case where hurting or stabbing.3) when tip dynamics refers to being pierced into tumor vessel inner wall when being pierced into, power possessed by puncture needle head； 4) precision being pierced into refers to phase recency of the site with default puncture site for actually puncturing blood vessel, about close to 100% its essence Accuracy is higher, and precision is higher, and when being repeatedly pierced into, Overlay is better, and piercing is easier.5) sample time refers to taking out Sample the time of the samplers sample drawns such as this syringe；6) biopsy accuracy rate refers to getting a effective amount of tumor tissues Just the reason of accuracy rate capable of being made to reach 100%, leading to biopsy rate of precision, is basic are as follows: structure limitation makes its office to tumor tissues Portion's destructiveness is weak, and the tumor tissues effective quantity of taking-up is very little, and the rate of precision of detection is caused to reduce.7) the physiological saline note of T1 temperature Enter amount to refer to being closed head and maintain the amount being added required for the closure of head.

The result of above-mentioned experimental group and contrast groups is described as follows shown:

Embodiment 1: it can smoothly pass through the femoral artery tasted and arteria hepatica etc. and enter tumor vessel.Walking spirit It is living, it is easy to vascular wall is pierced through, when just can many times pierce through for 1 time, and precision is high, therefore not pierce through for the first time, second It is easy to just to pierce through.Due to the local failure tumor tissues that four tips can orient, therefore its sample time is shorter, and energy Enough get a effective amount of tumor tissues, biopsy accuracy rate be substantially 100% (exclude when detection human operational error or mistake etc. because Element).

Embodiment 2: it can smoothly pass through the femoral artery tasted and arteria hepatica etc. and enter tumor vessel.In the blood vessel It walks more flexible, it is easy to pierce through vascular wall, and precision is high, biopsy accuracy rate is high, due to the good airproof performance of its piercing needle, It needs to inject and maintains the amount of the physiological saline of T1 temperature few.

Embodiment 3: it can smoothly pass through the femoral artery tasted and arteria hepatica etc. and enter tumor vessel.In the blood vessel It walks more flexible, it is easy to pierce through vascular wall, and precision is high, biopsy accuracy rate is high, due to the good airproof performance of its piercing needle, It needs to inject and maintains the amount of the physiological saline of T1 temperature few.

Comparative example 1: it can smoothly pass through long femoral artery and arteria hepatica etc. substantially and enter tumor vessel.Its is right The injury tolerance of blood vessel is smaller, and tip dynamics can ensure to pierce through vascular wall, and precision is also higher；Since four tips can determine To local failure tumor tissues, therefore its sample time is shorter, and can get a effective amount of tumor tissues, biopsy accuracy rate base It originally is 100% (excluding the factors such as human operational error or mistake when detection).

Comparative example 2: since the width b of shape memory alloy increases, therefore its reduction of pliability, although by the gap between screw pitch C is also increased accordingly, but due to b wider, therefore the flexibility of part still greatly reduces, in the biggish blood vessel of curvature When middle walking, the injury tolerance of vascular wall is greatly increased.Correspondingly, smooth degree in the blood vessel will reduce, and will increase Travel time.

Comparative example 3: 1. since width b reduces, and gap c increases, therefore its intensity is lower, and when walking, the time can be corresponding Increase.2. since width b is too small, therefore even if why together by spiral coil, intensity is still substantially reduced, tip dynamics also phase That answers decreases.And its precision being pierced into is significantly reduced, therefore puncture vascular wall enters the tumour time and also increases accordingly It is long.Dynamics decline, then for damage local tumor tissue so that the time of sampling also can integrally increased.

Comparative example 4: the cutting-edge structure 1. kept straight on, it is very big to injury of blood vessel degree, it can also largely effect on travel time；And Interventional guide wire can not stretch out, and not have the effect of front end guidance, can also greatly increase travel time in the blood vessel.2. due to Only one point of its tip, it is poor to the local failure effect of tumor tissues, therefore be difficult to get effective tumor tissues sample when sampling This, causes its sample time to increase.3. since sample time is longer, therefore tumor tissues amount is very little in the sample got sometimes, leads Accuracy rate is caused to reduce.4. needing especially to infuse in addition, since degree of injury of its tip to blood vessel is big, therefore when walking in the blood vessel Meaning, travel time greatly increase.

Comparative example 5: 1. since four sharp youngsters of four conical lobes are not dispersed in four places, Gu Qijian in same point End dynamics very little, it is not easy to wear out vascular wall, be not easy to enter in tumor tissues across blood vessel wearing out.2. due to its point End dynamics is small, and strength control is more difficult, and it is generally necessary to which being repeatedly pierced into can just puncture, therefore its precision for being pierced into blood vessel obviously drops It is low.3. the time that its puncture vascular wall enters tumor tissues is very long, many times tumour cannot be introduced into piercing through vascular wall Tissue；4. entering in tumor tissues since entire piercing needle can not pass through blood vessel, therefore it is difficult to get effective tumor group substantially It knits, clinical application can not be carried out.

Comparative example 6: 1. its tip itself is that have certain dynamics but what is connect behind is spring, and spring is due to its elastic force Effect, and make to be remote operation when power, therefore intensity is inadequate, it is not easy to which control makes force, and in the effect of its elastic force Under, when making power, spring section is easily bent, and strength is easy to disperse from different directions, and piercing dynamics is caused to substantially reduce, point The power at end is smaller, and it is larger to wear out blood vessel difficulty, and needing repeatedly puncture can not even puncture.2. being pierced into the essence of vascular wall Accuracy is poor, and the site difference of the piercing of homogeneous is not larger, therefore is pierced into every time relatively difficult.3. due to being pierced into blood vessel in not homogeneous The precision of wall is poor, therefore preceding piercing several times is to the subsequent dynamics being pierced into almost without booster action, therefore needed for being pierced into every time It is consistent, it is very big to the injury tolerance of vascular wall when causing its piercing time to greatly increase, and being pierced into.4. due to the elastic force of spring Effect, keeps capable direction more difficult to control, therefore orientation is poor to the destructive power of local tumor tissues, for getting effective tumour Tissue needs the long period, and stability is also poor.5. since sample time is longer, therefore tumor tissues amount in the sample got sometimes Very little, accuracy rate is caused to reduce.

Comparative example 7: since toughness reduces, lead to flexibility reduction of walking in the blood vessel, the injury tolerance of internal blood vessel is increased Add.Even if the intensity of spring is consistent with the intensity at a temperature of T1 in embodiment 1, but since the person's character of its spring makes so, so that thorn Fashionable, the strength direction on spring is difficult unanimously, it will usually scatter one's forces to different directions, the dynamics at tip is caused obviously to drop It is low, and the precision being pierced into also is easily reduced, the time of piercing is also easier to reduce, in short, the dynamics of its piercing, precision It is all unstable with the time, sometimes more satisfactory, very laborious youngster sometimes；Stability is poor when it is applied；One is also had for sample time Fixing is rung.In addition, since degree of injury of its tip to blood vessel is big, therefore when walking in the blood vessel, great care is needed, when walking Between greatly increase.

Data in the present embodiment are the average value that test of many times obtains.For the injury tolerance within 10%, Bu Huiying Human health is rung, and left and right can self-healing for 24 hours.And using the puncture needle in the utility model embodiment, blood vessel is being worn out During, be to compare accurately substantially, it is only necessary to pierce an aperture just can pass through vascular wall, due to blood vessel elastic force and Self-regeneration power, therefore the damage in the application substantially all can self-healing.And the damage in some comparative examples, the meeting in transmission process It causes to damage, when being pierced into, since the precision of piercing is inadequate or the power in some direction controls inconvenience, therefore causes to be pierced into blood vessel After wall, local damage is more serious, and drug many times must all be added and carry out interventional therapy, suppository is such as added.

In the present invention, the outer diameter of interventional guide wire 9 is not more than the internal diameter of long tube and head, and interventional guide wire 9 is by not The seal wire that the steel that becomes rusty is constituted.Interventional guide wire 9 or the package wrapping wire layer outside stainless steel wire, wrapping wire layer are wrapped up solid by least one Surely the wrapping wire for being surrounded on stainless steel core periphery is constituted, and can also be coated hydrophilic layer outside wrapping wire layer, is conveniently exposed at a point valvular structure front end Part more smoothly walk in the blood vessels.Can also between hydrophilic layer and wrapping wire layer coated polymer layer.The material of hydrophilic layer It can be polytetrafluoroethylene (PTFE), silicon rubber, polyethylene, polyvinyl chloride, fluorocarbon polymer or polyurethane etc..

In the present invention, at T0 (such as 37 DEG C), it will divide valvular structure is prefabricated to be in an open state, metallic coil is pre- It is made as the state of spiral release；Then at T1 (such as 5 DEG C), valvular structure will be divided to be made as the state closed, metallic coil in advance It is made as the state that spiral is tightened in advance, specific method for prefabricating is referring to the prior art.

The above is only the preferred embodiment of the present invention, is not intended to limit the utility model, for this field For technical staff, the utility model can have various modifications and changes.All institutes within the spirit and principle of the utility model Any modification, equivalent substitution, improvement and etc. of work, should be included within the scope of protection of this utility model.

Claims (8)

1. a kind of intravascular memory metal puncture needle, it is characterised in that: the puncture needle include can open and close divide valvular structure And the hollow metallic coil containing multiple spiral coils, divide valvular structure and metallic coil to be made of memory metal, This divides valvular structure to be made of multiple conical lobes；

When temperature is T1, the screw pitch in metallic coil between two neighboring spiral coil reduces, and divides each in valvular structure Conical lobe closure, this divides valvular structure in cone shape structure so that its intensity increase can pierce through vascular wall；

When temperature is T0, the screw pitch in metallic coil between two neighboring spiral coil increases so that the enhancing of its flexibility and energy Each conical lobe that enough blood vessel middle and long distances in vivo are flexibly walked, and divided in valvular structure is opened so that intervention is led in application Silk may pass through wherein, this divides valvular structure to be the cylindrical-shaped structure for containing multiple tapered indentations on wall after opening, and this is cylindric The center of structure is open cavity structure.

2. intravascular memory metal puncture needle according to claim 1, it is characterised in that: described to divide the big straight of valvular structure Diameter one end and metallic coil integrally connected, each equal curvature of point is consistent thereon for the conical lobe, is made of arcwall face Conical lobe.

3. intravascular memory metal puncture needle according to claim 2, it is characterised in that: the shape of all conical lobes It is consistent with size.

4. intravascular memory metal puncture needle according to claim 1, it is characterised in that: when temperature is T1, metal spiral shell Two neighboring spiral coil closely forms more closed structure by being combined in coil, each conical lobe closure, and in phase In adjacent two conical lobes, two close closings in side close to each other, this divides valvular structure to constitute totally enclosed cone shape Structure；

When temperature is T0, when each conical lobe is opened, divide valvular structure everywhere substantially uniform-diameter, and and metal spiral Pipe it is substantially uniform-diameter.

5. intravascular memory metal puncture needle according to claim 1, it is characterised in that: the conical lobe include tail end and Tip, by tail end to tip, its width is sequentially reduced, and when each conical lobe closure, the diameter of tail end is greater than the straight of tip Diameter；

Temperature T0 is 37 DEG C, and temperature T1 is 5 DEG C.

6. intravascular memory metal puncture needle according to claim 1, it is characterised in that: the memorial alloy of spiral coil is made The width b of piece is 0.3-1mm, and when spiral coil unclamps, the gap c between two neighboring spiral coil is 0.05-0.2mm；

When the screw pitch in metallic coil reduces, the gap c between two neighboring spiral coil is less than 0.001mm or even nothing Gap is ok.

7. intravascular memory metal puncture needle described in any one of -6 according to claim 1, it is characterised in that: metal spiral The length of pipe is 4-10mm.

8. intravascular memory metal puncture needle according to claim 7, it is characterised in that: the length for dividing valvular structure For 3~10mm, when valvular structure being divided to open, outer diameter 0.4mm, internal diameter 0.3mm.