CN204815142U - Safety transfusion needle - Google Patents

Abstract

The utility model provides a safety transfusion needle, include inner tube and cover locate in the outer tube of outside of tubes, the first end of inner tube has set firmly the steel needle, the second end is used for connecting the infusion pipe with the steel needle intercommunication, the inner tube can be for outer tube along axial motion to move back the steel needle to the outer tube in, still include safety device, this safety device includes: the boss is located on the outer peripheral face of the first end of inner tube, first shell fragment, second shell fragment are located on the outer tube and along radial relative, form the clearance that supplies the boss to pass through between first shell fragment, the second shell fragment, and along from first direction of holding the second end, the clearance is including the first portion and the second portion of intercommunication, and the radial dimension of first portion is not less than the radial dimension of boss, and the radial dimension of second portion is less than the radial dimension of boss, backstop portion, locate the outer tube on, and be located the second end of first shell fragment, second shell fragment, it is spacing that backstop portion is used for carrying out the axial to the boss. This safety transfusion needle can solve by the problem of mistake thorn.

Description

Safety transfusion needle

Technical field

This utility model relates to a kind of medical apparatus and instruments, in particular to a kind of safety transfusion needle.

Background technology

At present, medical personnel choose after for patient infusion transfusion needle time, or when the transfusion needle of process, often by the accidental needle sticks of draw point, can even cause liquid contamination (particularly blood contamination).Especially, when the user of transfusion needle is patient (as aids patient, the hepatitis patient etc.) suffering from infectious disease, syringe needle by mistake thorn can cause medical personnel to infect virus, the physical and mental health of serious threat nursing staff and life security.

Following three kinds of follow-on transfusion needles are mainly contained, to attempt to solve the problem of thorn and liquid drippage by mistake in prior art:

The first transfusion needle arranges holding section in draw point outer housing, when transfusion needle is finished using, by sheathed for outer housing firmly draw point, and makes draw point be fastened in holding section, and its major defect is that draw point needs again to be exposed to outside, still there is the risk that thorn and liquid by mistake drip.The more important thing is, when draw point is fastened in holding section, because draw point is stressed, liquid (particularly blood) residual on syringe needle can splash, and even splashes to outside outer housing, causes liquid contamination, the health of other patients of serious threat and medical personnel.In addition, need outer housing to be again set in outside draw point after finishing using, troublesome poeration, affects the work efficiency of medical personnel.

Publication number is disclose the second transfusion needle in the patent application of CN109368A, as shown in Figure 1 (for convenience of describing, Fig. 1 finely tunes former graph laplacian), the draw point with syringe needle 11 is installed on sleeve 12, and is located in holding cylinder 2 movably, during use with sleeve 12, the syringe needle 11 of draw point passes holding cylinder 2 and is exposed to outside holding cylinder, after finishing using, by syringe needle 11 rollback in holding cylinder 2, and be fastened in holding cylinder 2.The mode fastened by projection-pit between sleeve 12 and holding cylinder 2 realizes interfixing.But this transfusion needle has two shortcomings: one when being syringe needle 11 rollback, accurately cannot judge whether sleeve 12 and holding cylinder 2 are engaging in place; Even if two is that both engage mutually, if but maloperation occurs, syringe needle 11 can also stretch out holding cylinder 2 again, thus there is the risk that syringe needle exposes again.

The third transfusion needle adds spring mechanism on the basis of the second, and spring mechanism is connected with draw point, during rollback, starts spring mechanism, by the elastic force effect of spring by draw point automatic retracted in holding cylinder.In this transfusion needle, because draw point retraction speed under spring force effect is too fast, the problem of two aspects can be produced: one is that patient can feel frightened; Two is that draw point can shake, and when shaking, the liquid inside draw point can splash, thus threatens the health of patient and medical personnel because rollback speed is too fast.

Visible, though there is a lot of safety transfusion needle in the market, still there is potential danger in actual use, for this reason, inventor proposes a kind of new safety transfusion needle, to overcome the above problems.

Utility model content

The problem that this utility model solves is that medical personnel are easily stung in the process using existing transfusion needle by mistake.

For solving the problem, this utility model provides a kind of safety transfusion needle, and comprise interior pipe and be sheathed on the outer tube outside described interior pipe, the first end of described interior pipe is installed with draw point, and the second end is for connecting the transfusion catheter be communicated with described draw point; Described interior pipe can move vertically relative to described outer tube, to retreat in described outer tube by described draw point; Also comprise safety device, this safety device comprises: boss, is located on the outer peripheral face of described interior pipe first end; First shell fragment, the second shell fragment, to be located on described outer tube and radially relative, the gap passed through for described boss is formed between described first shell fragment, the second shell fragment, edge is from described first end to the direction of described second end, described gap comprises Part I and the Part II of connection, the radial dimension of described Part I is not less than the radial dimension of described boss, and the radial dimension of described Part II is less than the radial dimension of described boss; Stopper section, is located on described outer tube, and is positioned at the second end of described first shell fragment, the second shell fragment, and described stopper section is used for carrying out axial limiting to described boss.

Optionally, described outer tube is provided with the stopper slot that can hold described boss, is positioned at the second end of described first shell fragment, the second shell fragment, described stopper slot towards described boss openings, described stopper slot axial side wall form described stopper section.

Optionally, the first end of described boss has towards the V-shaped groove of first end opening, and the second end of described first shell fragment, the second shell fragment is respectively equipped with point, and described point is relative vertically with described V-shaped groove, for being inserted in described V-shaped groove.

Optionally, edge is from first end to the direction of the second end, and the radial dimension of described boss diminishes.

Optionally, also comprise quick detach joint, this quick detach joint is sheathed on outside described interior pipe regularly, and removably coordinates with described outer tube.

Optionally, described quick detach joint comprises: be sheathed on the base portion outside described interior pipe, and is connected to the first end of described base portion and is located at the handle of the radial both sides of described interior pipe respectively, and each handle is being respectively equipped with slide block towards the side of described interior pipe; The sidewall of described outer tube is provided with axial groove, described axial groove runs through the second end of described outer tube, edge is from described first end to the direction of described second end, and described axial groove comprises the first groove and second groove of connection, and the radial dimension of described first groove is greater than the radial dimension of described second groove; Described slide block is arranged in described first groove, and when the handle move toward one another of radial both sides, described slide block can depart from described first groove and skid off described outer tube with the second groove that the axially-movable edge of described interior pipe is corresponding.

Optionally, the second end of described second groove has V-arrangement opening, and along the direction towards the second end, the size of described V-arrangement opening becomes large.

Optionally, described outer tube is water white transparency pipe, and described interior pipe is for there being colour tube.

Compared with prior art, the technical solution of the utility model has the following advantages:

Interior pipe moves relative to outer tube, make draw point rollback in outer tube, boss is through the gap the first shell fragment, the second shell fragment in the process, because in gap, the radial dimension of Part II is less than the radial dimension of boss, boss is when entering Part II, and the first shell fragment, the second shell fragment are softened, after boss passes gap completely, first shell fragment, the second shell fragment reset and sound, and put in place to inform in medical personnel that managing moves.Simultaneously because the radial dimension of Part II in gap is less than the radial dimension of boss, boss will be difficult to oppositely enter in Part II.

Further, the second end of the first shell fragment, the second shell fragment arranges point, and the first end of boss arranges V-shaped groove, and after boss passes gap, point inserts in V-shaped groove, stops the adverse movement of boss.

Accompanying drawing explanation

Fig. 1 is the structural representation of existing transfusion needle.

Fig. 2 is the structural representation of the safety transfusion needle of this utility model embodiment one, and wherein draw point is hidden in needle tubing.

Fig. 3 is the exploded view of the safety transfusion needle of this utility model embodiment one.

Fig. 4 shows the safety transfusion needle termination liquid joint of this utility model embodiment one and the syndeton of interior pipe.

Fig. 5 is the three-dimensional structure diagram of the safety transfusion needle termination liquid joint of this utility model embodiment one.

Fig. 6 is the structural representation of the safety transfusion needle middle external tube of this utility model embodiment one.

Fig. 7 is the enlarged drawing of the part Q1 irised out in Fig. 2.

Fig. 8 is the right view of the safety transfusion needle middle external tube of this utility model embodiment one.

Fig. 9 shows embodiment one and stops liquid joint and be assembled to state in Connection Block.

Figure 10 shows the state that embodiment one stops liquid joint disengaging Connection Block.

Figure 11 is the structural representation of interior pipe in the safety transfusion needle of this utility model embodiment one.

Figure 12 is the enlarged drawing of the part Q2 irised out in Figure 11.

Figure 13 is the structural representation of the safety transfusion needle of this utility model embodiment two, and wherein draw point is hidden in needle tubing.

Figure 14 is the exploded view of the safety transfusion needle of this utility model embodiment two.

Figure 15 is the top view of the quick detach joint of the safety transfusion needle of this utility model embodiment two.

Figure 16 shows the stereochemical structure of quick detach joint from looking up direction.

Figure 17 is the structural representation of the outer tube of the safety transfusion needle of this utility model embodiment two.

Figure 18 is the enlarged drawing of the part Q3 irised out in Figure 13.

Figure 19 is the structure diagram of axial groove in the part Q4 irised out in Figure 18.

Figure 20 shows quick detach joint in embodiment two and is assembled to the state in the second groove of axial groove.

Figure 21 shows quick detach joint in embodiment two and departs from the state of the second groove.

Detailed description of the invention

For enabling above-mentioned purpose of the present utility model, feature and advantage more become apparent, and are described in detail specific embodiment of the utility model below in conjunction with accompanying drawing.

Embodiment one

The present embodiment provides a kind of safety transfusion needle; with reference to shown in Fig. 2-3; comprise needle tubing 10; the first end A of needle tubing is installed with draw point 1 (Fig. 3); second end B is for connecting the transfusion catheter 2 be communicated with draw point 1; when not using, draw point 1 stretches out the first end of needle tubing 10, and is covered by protective cover 103.Syringe 10 is outer is also provided with two fins 104.During puncture, upwards turned down by fin 104, make two fins 104 overlapping, and remove protective cover 103, then hand-held fin 104 punctures, and punctures complete and after confirming blood back, is infused by transfusion catheter 2.

It is noted that, in following each parts, the one end towards needle tubing first end direction is all called " first end ", the one end towards needle tubing second extreme direction is all called the second end." radial direction " refers to the direction with the diameter parallel of needle tubing.

The safety transfusion needle of the present embodiment also comprises only liquid joint 20, at infusion-completed rear enclosed transfusion catheter 2, avoids transfusion liquid to ooze.

Particularly, shown in Fig. 2-3 composition graphs 4-5, only liquid joint 20 has the base portion 21 being located at needle tubing 10, and to be connected with base portion 21 and to be located at first handle 201, the second handle 202 of the radial both sides of transfusion catheter 2 respectively, first handle 201, second handle 202 can move toward one another engagings mutually.First handle 201, second handle 202 are respectively equipped with convex tendon 201a, 202a towards the side of transfusion catheter 2, for extruding at first handle 201, second handle 202 and close transfusion catheter 2 when mutually engaging.Transfusion catheter 2 is generally flexible pipe, the moment be closed, transfusion catheter 2 produces suction by the fluid in draw point 1, transfusion liquid on draw point 1 syringe needle or blood are sucked in draw point 1, thus after ensureing that transfusion catheter 2 is closed, the syringe needle of draw point 1 does not have residual liquid, thus prevents liquid contamination.

Wherein, the convex tendon number on each handle can be one or more respectively, is one in the present embodiment.When first handle 201, second handle 202 move toward one another, be located at convex tendon 201a, 202a move toward one another thereupon on handle, and extrude transfusion catheter 2, until transfusion catheter 2 is closed.When first handle 201, second handle 202 engage mutually, transfusion catheter 2 keeps the state be closed.

In the present embodiment, the convex tendon 201a of the first handle 201 and convex tendon 202a of second handle 202 staggers vertically mutually, that is radially observes, and convex tendon 201a, 202a are not point-blank.Further, the length direction of every bar convex tendon and the axial vertical of transfusion catheter 2, with radial parallel.In other embodiments, convex tendon 201a, 202a also can radially be located on the same line, convex tendon also can adopt other shapes, but at least to meet its length along transfusion catheter radial direction and run through a whole transfusion catheter, to make, when first handle, second handle engage, transfusion catheter to be closed completely.

Wherein, engaged between first handle 201, second handle 202 by the mode of buckle-draw-in groove, as Fig. 4-5, first handle 201 is provided with buckle 201b, and second handle 202 is provided with draw-in groove 202b, and buckle 201b is used for engaging with draw-in groove 202b.As shown in FIG., buckle 201b has two, is located at the both sides of transfusion catheter 2 along the width of first handle 201 respectively, and draw-in groove 202b also correspondingly has two, is located at the both sides of transfusion catheter 2 along the width of second handle 202 respectively.Buckle 201b, draw-in groove 202b are located at the second end of first handle 201, second handle 202 respectively.

Further, continue with reference to Fig. 2, Fig. 3, the outer tube 12 that needle tubing 10 comprises interior pipe 11 and is sheathed on outside interior pipe 11, draw point 1, transfusion catheter 2 are connected with interior pipe 11 respectively, and interior pipe 11 can move vertically relative to outer tube 12, to be retreated in outer tube 12 by draw point 1.Thus, when after infusion-completed, interior pipe 11 can be pulled vertically, draw point 1 to be retreated in outer tube 12, and make the syringe needle of draw point 1 coated by outer tube 12 institute, to prevent syringe needle to be exposed to outer, thorn by mistake occurs.

In the present embodiment, only liquid joint 20 is as the connector of interior pipe 11 and outer tube 12, the relative locking in realizing between pipe 11, outer tube 12 or unblock.Particularly, composition graphs 4, only base portion 21 fixed cover of liquid joint 20 is located at outside interior pipe 11, is removably located at outer tube 12 simultaneously, when base portion 21 coordinates with outer tube 12, mutually between interior pipe 11 and outer tube 12 to lock and can not relative motion; When first handle 201, second handle 202 engage mutually, base portion 21 can depart from outer tube 12.When base portion 21 departs from outer tube 12, unlock between interior pipe 11 and outer tube 12, interior pipe 11 can move relative to outer tube 12, and detaches outer tube 12 by movement vertically, draw point 1 is hidden in outer tube 12 simultaneously.

Mode by clamping between base portion 21 with outer tube 12 coordinates.With reference to Fig. 3-5 also shown in composition graphs 6, Fig. 7 and Fig. 8, second end of outer tube 12 is provided with the Connection Block 13 with inner chamber, inner chamber has opening towards the second end, base portion 21 is inserted in the inner chamber of Connection Block 13, base portion 21 is provided with the fixture block 21a be connected with first handle 201, second handle 202 respectively, and is sheathed on the sleeve 21b (Fig. 4) outside interior pipe 11.The inwall of Connection Block 13 is provided with the groove 13a (Fig. 6-8) corresponding with fixture block 21a, and fixture block 21a is arranged in groove 13a, can move in the same way, to depart from groove 13a by the handle respectively with correspondence.

With reference to shown in Fig. 9-10, when first handle 201, second handle 202 are not operating, fixture block 21a is arranged in corresponding groove 13a (Fig. 9); When first handle 201, second handle 202 move toward one another, drive fixture block 21a also move toward one another, make fixture block 21a depart from groove 13a (Figure 10), thus complete base portion 21 and the disengaging of outer tube 12, interior pipe 11 is unlocked with outer tube 12.

Further, in order to avoid draw point 1 is retreating to after in outer tube 12, again stretch out outer tube 12, the present embodiment is provided with safety device in needle tubing 10, for when draw point 1 retreats in outer tube 12, stops that draw point 1 passes outer tube 12.

Continuation is with reference to Fig. 2-3, Fig. 6-7 and in conjunction with shown in Figure 11, Figure 12, safety device comprises:

Boss 11a (Figure 11, Figure 12), is located on the outer peripheral face of interior pipe 11 first end;

First shell fragment 12a, the second shell fragment 12b, to be located on outer tube 12, radially relatively and shape is substantially identical, the clearance G passed through for boss 11a is formed between first shell fragment 12a, the second shell fragment 12b, edge is from first end to the direction of the second end, clearance G comprises Part I G1 and the Part II G2 of connection, the radial dimension of Part I G1 is not less than the radial dimension of boss 11a, and the radial dimension of Part II G2 is less than the radial dimension of boss 11a.

Stopper section (not shown), is located on outer tube 12, and is positioned at second end of the first shell fragment 12a, the second shell fragment 12b, and stopper section is used for carrying out axial limiting to boss 11a, stops boss 11a to continue motion, deviates from outer tube 12 to prevent interior pipe 11.As Fig. 6, outer tube 12 is provided with the stopper slot 12c that can hold boss 11a, and stopper slot 12c is positioned at second end of the first shell fragment 12a, the second shell fragment 12b, and the axial side wall of stopper slot 12c forms stopper section.

Along with interior pipe 11 is relative to the axially-movable of outer tube 12, the inwall along outer tube 12 moves by boss 11a, enters the clearance G between the first shell fragment 12a, the second shell fragment 12b successively, then passes clearance G, enters stopper slot 12c, and be finally arranged in stopper slot 12c.When interior pipe 11 moves vertically, boss 11a can enter into the Part I G1 of clearance G smoothly with the motion of interior pipe 11; When boss 11a moves to the Part II G2 of clearance G, the first shell fragment 12a, the second shell fragment 12b will be strutted by boss 11a and larger elastic deformation occur, and now medical personnel obviously will feel that pulling out pin resistance becomes large; When boss 11a is completely by Part II G2, first shell fragment 12a, the second shell fragment 12b restore to the original state under the effect of elastic force, now medical personnel will feel that pulling out pin resistance disappears substantially, first shell fragment, the second shell fragment are sounded owing to disengaging with boss 11a simultaneously, and whether rollback puts in place to judge inner core 11 with assist personnel.Wherein, from first end to the direction of the second end, the radial dimension of boss 11a diminishes gradually, is entered smoothly in stopper slot 12c smoothly to make boss 11a by clearance G.Particularly, boss 11a can be inverted trapezoidal platform G.Wherein, the shape of stopper slot 12c and the mating shapes of boss 11a.

In addition, in the present embodiment, outer tube 12 is set to water white transparency pipe, interior pipe 11 has been set to colour tube, observe to help medical personnel whether boss 11 arrives stopper slot 12c completely position by clearance G.

With reference to Fig. 7, shown in Figure 11-12, in the present embodiment, in order to prevent making inner core 11 adverse movement due to maloperation further, cause outside draw point 1 is exposed to again, arrange towards the V-shaped groove 11b (Figure 12) of first end opening at the first end of boss 11a, first shell fragment 12a, second end of the second shell fragment 12b arranges point s1 respectively, s2 (Fig. 7), point s1, s2 is relative vertically with V-shaped groove 11b, when boss 11a is completely by after clearance G, point s1, s2 inserts in V-shaped groove 11b simultaneously, if boss 11a adverse movement, V-shaped groove 11b can tightly wrap point s1, s2, make the first shell fragment 12a, second shell fragment 12b cannot be strutted again, thus ensure that inner core 11 and draw point 1 can not pass urceolus 12 again.

In the present embodiment, point s1, s2 form a V-arrangement shape of mating with V-shaped groove.In other embodiments, as long as point has the tip that easily can enter V-shaped groove.

Embodiment two

The safety transfusion needle of the present embodiment has the safety device identical with embodiment one, and the difference of the present embodiment and embodiment one is, the only liquid joint 20 in embodiment one is replaced with quick detach joint 30, and this quick detach joint 30 does not stop liquid function.

With reference to Figure 13, Figure 14 in conjunction with shown in Figure 15, Figure 16, quick detach joint 30 is sheathed on outside interior pipe 11, and removably coordinates with outer tube 12.Under unused state, interior pipe 11 stretches out outer tube 12 at the second end.Particularly, quick detach joint 30 comprises:

Be sheathed on the base portion 31 in part that interior pipe 11 stretches out outside outer tube 12, and be connected to the first end of base portion 31 and be located at the handle 301 of the radial both sides of interior pipe 11 respectively, each handle 301 is being respectively equipped with slide block 301a (Figure 16) towards the side of interior pipe 11;

As Figure 17, Figure 18 and in conjunction with shown in Figure 19, the sidewall of outer tube 12 is provided with axial groove 121, axial groove 121 runs through the second end of outer tube 12, edge is from first end to the direction of the second end, axial groove 121 comprises the first groove 121a and the second groove 121b of connection, and the radial dimension of the first groove 121a is greater than the radial dimension of the second groove 121b and forms shaft shoulder 121c in junction.

Slide block 301a is arranged in the first groove 121a, and is resisted against vertically respectively on corresponding shaft shoulder 121c.

As Figure 20, when handle 301 is not operating, slide block 301a is arranged in the radial both sides of the first groove 121a respectively; As Figure 21, when being positioned at handle 301 move toward one another of radial both sides, slide block 301a radially inwardly can move and depart from the first groove 121a; Along with interior pipe 11 is relative to the axially-movable of outer tube 12, slide block 301a slidably to the second groove 121b also skids off outer tube 12 along the second corresponding groove 121b, finally makes interior pipe 11 unlock with outer tube 12.

As Figure 19, second end of the second groove 121b has V-arrangement opening (not marking in figure), and along the direction towards the second end, the size of V-arrangement opening becomes large.When slide block 301a slides into the position of V-arrangement opening, along with the continuation of slide block 301a is slided, due to the ramp effect of V-arrangement opening, now, even if medical personnel do not continue to exert a force to handle 301, slide block 301a also can skid off axial groove 121 along with V-arrangement opening automatically.

In other embodiments, if the gap between inner and outer tubes is enough large, the base portion of quick detach joint also can be connected in the part that interior pipe is positioned within outer tube.

In the present embodiment, the handle due to quick detach joint is positioned at the first end of base portion and is positioned at outer tube both sides, therefore can reduce transfusion needle from quick detach joint to the distance of draw point, reduces the size of transfusion needle, realizes the miniaturization of transfusion needle.

Although this utility model discloses as above, this utility model is not defined in this.Any those skilled in the art, not departing from spirit and scope of the present utility model, all can make various changes or modifications, and therefore protection domain of the present utility model should be as the criterion with claim limited range.

Claims (8)

1. a safety transfusion needle, comprise interior pipe and be sheathed on the outer tube outside described interior pipe, the first end of described interior pipe is installed with draw point, and the second end is for connecting the transfusion catheter be communicated with described draw point;

Described interior pipe can move vertically relative to described outer tube, to retreat in described outer tube by described draw point;

It is characterized in that, also comprise safety device, this safety device comprises:

Boss, is located on the outer peripheral face of described interior pipe first end;

First shell fragment, the second shell fragment, to be located on described outer tube and radially relative, the gap passed through for described boss is formed between described first shell fragment, the second shell fragment, edge is from described first end to the direction of described second end, described gap comprises Part I and the Part II of connection, the radial dimension of described Part I is not less than the radial dimension of described boss, and the radial dimension of described Part II is less than the radial dimension of described boss;

Stopper section, is located on described outer tube, and is positioned at the second end of described first shell fragment, the second shell fragment, and described stopper section is used for carrying out axial limiting to described boss.

2. safety transfusion needle as claimed in claim 1, it is characterized in that, described outer tube is provided with the stopper slot that can hold described boss, is positioned at the second end of described first shell fragment, the second shell fragment, described stopper slot towards described boss openings, described stopper slot axial side wall form described stopper section.

3. safety transfusion needle as claimed in claim 1, it is characterized in that, the first end of described boss has towards the V-shaped groove of first end opening, second end of described first shell fragment, the second shell fragment is respectively equipped with point, described point is relative vertically with described V-shaped groove, for being inserted in described V-shaped groove.

4. safety transfusion needle as claimed in claim 1, is characterized in that, edge is from first end to the direction of the second end, and the radial dimension of described boss diminishes.

5. safety transfusion needle as claimed in claim 1, it is characterized in that, also comprise quick detach joint, this quick detach joint is sheathed on outside described interior pipe regularly, and removably coordinates with described outer tube.

6. safety transfusion needle as claimed in claim 5, it is characterized in that, described quick detach joint comprises:

Be sheathed on the base portion outside described interior pipe, and be connected to the first end of described base portion and be located at the handle of the radial both sides of described interior pipe respectively, each handle is being respectively equipped with slide block towards the side of described interior pipe;

The sidewall of described outer tube is provided with axial groove, described axial groove runs through the second end of described outer tube, edge is from described first end to the direction of described second end, and described axial groove comprises the first groove and second groove of connection, and the radial dimension of described first groove is greater than the radial dimension of described second groove;

Described slide block is arranged in described first groove, and when the handle move toward one another of radial both sides, described slide block can depart from described first groove and skid off described outer tube with the second groove that the axially-movable edge of described interior pipe is corresponding.

7. safety transfusion needle as claimed in claim 6, it is characterized in that, the second end of described second groove has V-arrangement opening, and along the direction towards the second end, the size of described V-arrangement opening becomes large.

8. the safety transfusion needle according to any one of claim 1-7, is characterized in that, described outer tube is water white transparency pipe, and described interior pipe is for there being colour tube.