CN1633945A

CN1633945A - Flashing blood taking needle with needle cover

Info

Publication number: CN1633945A
Application number: CN 200310124547
Authority: CN
Inventors: 陈子龙; 莫约翰
Original assignee: BD Medical Products Pte Ltd
Current assignee: BD Medical Products Pte Ltd
Priority date: 2003-12-31
Filing date: 2003-12-31
Publication date: 2005-07-06

Abstract

The disclosed assembly comprises a casing, an IV jacket tube for entering into a blood tube, a non-patient jacket tube for communicating a draining tube, a laminating cavity arranged outside the casing, and a shielding hood connected to one portion of the casing, thus realizing fine visibility for the laminating cavity chamber. After application, the shielding hood can be rotated into the closed position to enclose the IV jacket tube so as to prevent from being pricked by the needle.

Description

The flash of light blood taking needle that has needle shield

Background of invention

1. invention field

The present invention relates to a kind of blood taking needle assembly that flash of light chamber vein for confirmation enters that has.

2. description of related art

Needle assembly is used for gathering fluid sample such as blood on one's body from patient.Some such needle assembly is also attempted to use with discharge pipe, for example, by Becton Dikinson company with trade mark VACUTAINER ^TMThe discharge pipe of selling.The needle assembly of the fluid collection tube that is used to discharge comprises a needle stand, the passage that it has a near-end, a far-end and extends between two ends.Needle assembly comprises that also at least one is installed in the needle cannula on the needle stand.That this needle cannula comprises is one terminal to the outstanding sharp point that surpasses needle stand of far-end, one provide the inner chamber of connection to the outstanding near-end and that surpasses needle stand of near-end between the needle cannula opposite end.Some needle assembly comprises isolating near-end and distal cannula, and a part that depends on needle stand is to provide connection between telescopic inner chamber separately.The far-end of needle cannula is inclined to an enough sharp tip usually, so that thrust patient's skin and enter vein to be collected or other fluid source.The near-end of the needle cannula rubber chock plug on a discharge pipe that is configured to be used for puncturing.The near-end of needle cannula is covered by many samplings sleeve (multi-sample sleeve) of a reclosable pin puncture usually.This sleeve is subjected to the compression of the rubber chock plug of discharge pipe, and is biased into when being communicated with discharge pipe when the near-end of needle cannula, and sleeve is punctured by the near-end of needle cannula.

Gathering the problem that fluid relates on one's body from patient is: in the process of attempting to enter into the suitable fluid source of patient on one's body definite assurance can not be arranged.For example, the blood sampling program requires bleeder to locate a vein usually visually, then, enters into intravenous with the far-end of needle cannula.Bleeder may not have the clear and definite venous that enters to show in this stage.Then, in case bleeder is considerably proved conclusively the blood vessel of target approach, promptly place a discharge pipe and be communicated with the near-end of needle cannula.Low pressure in discharge pipe and higher blood pressure cooperation are to produce flowing in the blood inflow pipe.Flowing of blood in the inflow pipe can be the first clear and definite indication of confirming that target blood entered for bleeder.Blood can account for a considerable time along the initial flow of long needle cannula inflow discharge pipe according to this process of several factors, and these factors comprise relative stress level and needle cannula length and sectional dimension.Bleeder may not flow to think it is the signal that does not arrive target blood suitably by mistake to blood immediately, and does not in fact see that flowing of blood should ascribe pressure and fluid-flow characteristics in the discharge pipe.Therefore, bleeder may unnecessarily be extracted pin out, and the program of restarting to take a blood sample.Its result, time waste, patient's damage increases.In view of above-mentioned all problems, many fluid acquisition needle assemblys are provided with a flash of light chamber that is communicated with needle cannula.This flash of light chamber is formed by transparent or semitransparent material to small part usually, and its purpose is to admit soon after entering vein suitably the blood flow of a part.

After an amount of sampling collected, the blood taking needle assembly was extracted on one's body from patient.Then, give up exhausted needle assembly.The medical matters industry is very clear can be spread disease behind the exhausted needle cannula pinprick unheedingly.Therefore, require in needle cannula exhausted needle cannula of guard shield immediately after patient extracts on one's body.This guard shield can take a number of different forms.For example, some guard shield can distal-to-proximal direction stretch in the needle cannula upper edge, and frictionally engages with needle stand.If guard shield does not align with needle cannula, then such guard shield can cause the danger of accidental needle sticks in the process of guard shield.The guard shield of some this universal class is provided with the axle journal of amplification, and its purpose is farthest to reduce the danger of accidental needle sticks in the guard shield process.Yet the guard shield of this universal class is not preferable.Other guard shield is scalable on needle stand, and can be on needle stand to remote extension to realize guard shield.The guard shield of this universal class is a safety and effective, and uses in many occasions.Yet such guard shield can disturb with the normal use of some medical apparatus and instruments.Other some guard shields hingedly are installed in or are close on needle stand, and can turn to needle cannula by the make position of guard shield from the open position that needle cannula exposes.The use of such guard shield is very good, is therefore accepted widely.Yet, on the fluid acquisition needle assembly that has the chamber that glistens, have hinged this guard shield, in view of the complexity that should provide guard shield to glisten the unobstructed observation of chamber two aspects again, it is being can be problematic instinctively.

Brief summary of the invention

But the present invention relates to a kind of fluid acquisition needle assembly of guard shield.This needle assembly comprises a shell, and it has the exterior side wall of a proximal end wall, the extension of a distal end wall and between proximal end wall and distal end wall, and like this, a chamber is formed between all end walls and the exterior side wall.Exterior side wall can with all end walls at least one form.In addition, at least a portion of exterior side wall is formed by transparent or semitransparent material, like this, can see the inside of the chamber in the shell.The passage of one near-end extends through the distal end wall of shell.Near-end and distal channel can axially be alignd mutually.Shell also can comprise one from distal end wall extend towards near-end ground, and around the internal side wall of the inlet that enters the distal channel in the chamber.This internal side wall also is to be formed by transparent or semitransparent material.

This needle assembly comprises that also one is installed in the shell distal channel and towards the outstanding distal cannula that surpasses shell distally.This distal cannula comprises an outside and isolated far-end of shell.This far-end tiltable becomes enough sharp tip so that can thrust patient's skin.Distal cannula comprises one from the remote extension of distal cannula and the inner chamber that is communicated with the chamber of shell.

Needle assembly comprises that also one is installed in the interior proximal sleeve of proximal channel of shell.Proximal sleeve comprises one towards the outstanding near-end that surpasses shell of near-end.In addition, proximal sleeve comprises one from proximal extension and enter into the inner chamber that is communicated with chamber.Proximal sleeve comprises that also one may extend into the far-end in the chamber, so that the far-end of the near-end of distal cannula and proximal sleeve is aligned with each other basically, and separates slightly mutually.In another embodiment, far-end and proximal sleeve can form mutually, and can comprise a transverse groove or hole, so as between the inner chamber of far-end and proximal sleeve, to provide with shell in being communicated with of chamber.

The near-end of distal cannula preferably is located on or near the distal end wall of shell.In addition, the far-end of proximal sleeve preferably a major part of the chamber by shell extend to a position near the distal end wall of shell.Therefore, far-end and proximal sleeve preferably are communicated with the chamber of needle assembly at the position near the distal end wall of shell.Its result, the fluidic finger that flows through distal cannula shows and will occur in or near on the position of shell distal end wall.In a preferred embodiment, shell can have above-mentioned internal side wall, and the far-end of proximal sleeve can be projected into vertically by internal side wall and encloses in the cylindrical space on boundary.

Needle assembly of the present invention also comprises a guard shield, and it can hingedly be connected to the position on the shell, and this position is positioned at the proximal end at the position of the first flash of light generation of indicating.Guard shield is positioned at guard shield and distal cannula and the chamber position of opening at interval at first.Therefore, guard shield does not hinder the use of distal cannula or the visual observation of chamber when guard shield is positioned at its open position.Yet guard shield can turn to the make position of shield encompasses distal cannula from open position.Guard shield and/or shell can comprise that at least one is used for guard shield is locked in the locking member of make position.But locking device can comprise the cannula lock of an elastic bending, and it is configured to engage with needle cannula when guard shield is positioned at make position.Guard shield is used for the lock of the connected structure (engaging structure) on the shell in the time of also can being included in its make position of guard shield.Structure on the guard shield and the joint between the structure on the shell can play the effect that guard shield is locked in make position.Perhaps, can realize that between guard shield and shell engage mainly can provide with sound and tactile mode indicated finishing of guard shield by cannula lock in the first locking of the guard shield of make position.

Description of drawings

Fig. 1 is the axonometric chart that decomposes according to needle assembly of the present invention.

Fig. 2 is the longitdinal cross-section diagram before needle assembly uses.

Fig. 3 is the side view of needle assembly, illustrate be placed to be communicated with blood vessel after but is communicated with situation before with discharge pipe.

Fig. 4 is the longitdinal cross-section diagram of needle assembly, is illustrated in use neutralization and is placed to and is communicated with situation afterwards with discharge pipe.

Fig. 5 is that needle assembly is finished guard shield side view afterwards.

Describe in detail

In Fig. 1-5, a needle assembly according to the present invention is usually labelled with label 10.Needle assembly 10 comprises: a shell 12, it has a near-end 14, a far-end 16 and extend, are roughly butt shape between two ends lateral wall 18.This lateral wall 18 is formed by transparent or semitransparent plastics, and forms a chamber 20 in the shell 12 between near-end 14 and far-end 16.One proximal channel (not shown) extends through the near-end 14 of shell 12, and is communicated with chamber 20.One distal channel 22 extends through the far-end 16 of shell 12, and also is communicated with chamber 20.Shell 12 also comprises one from the cylindrical shape medial wall 24 of far-end 16 towards near-end 14 extensions.Medial wall 24 is arranged in the lateral wall 18 substantially concentricly, and the end passage 22 of going the long way round basically forms with one heart.Medial wall 24 is also formed by transparent or semitransparent plastics.Therefore, can be easily see by medial wall 24 and enclose fluent material in the part of chamber 20 on boundary from the position of 18 outsides, lateral wall.Therefore, medial wall 24 in the present embodiment forms the chamber 26 of a flash of light, and can see the fluid that collects from the position of needle assembly 10 outsides in flash of light chamber 26.Chamber 26 is communicated with chamber 20, and therefore, chamber 20 also can play the effect that a flash of light shows.

Needle assembly 10 also comprises an IV sleeve pipe 30, and it has a near-end 32, a far-end 34 and an inner chamber that extends 36 between two ends.The far-end 34 of this IV sleeve pipe 30 is arranged on the outside of shell 12, and is inclined to enough sharp tip so that penetrate in patient's the skin or tissue.IV sleeve pipe 30 is installed in the distal channel 22 of shell 12, and like this, the near-end 32 of IV sleeve pipe 30 is adjacent to the far-end 16 of shell 12 basically.Therefore, inner chamber 36 is communicated with flash of light chamber 26 by the position of IV sleeve pipe 30 at the far-end 16 that roughly is adjacent to shell 12.

Needle assembly 10 comprises that also one is installed in interior non-patient (NP) sleeve pipe 40 of proximal channel at near-end 14 places of shell 12.This NP sleeve pipe 40 comprises that a near-end 42, that is arranged on shell 12 outsides is arranged on the inner chamber (not shown) that the far-end 44 and in the flash of light chamber 26 extends between two ends.Near-end 42 is inclined to enough sharp tip, (will further explain hereinafter) so that thrust in the rubber chock plug of a discharge pipe.Inner chamber by NP sleeve pipe 40 substantially axially aligns with inner chamber 36 by IV sleeve pipe 30.The far-end 44 of NP sleeve pipe 40 preferably with the only short distance at interval of the near-end 32 of IV sleeve pipe 30, for example, 0.5mm-1.2mm.

Needle assembly 10 comprises that also one is installed in the sleeve 46 on the part of the NP sleeve pipe 40 that is arranged on shell 12 outsides.Sleeve 46 is installed in the near-end 14 of shell 12, and by liquid impermeable and fluidic material form basically.Yet sleeve 46 also can be formed by the material that is easily thrust and can flexibly seal again by the near-end 42 of NP sleeve pipe 40.Therefore, the rubber chock plug of discharge pipe can be biased on the sleeve 46, and will cause sleeve 46 in the far-end collapsing.Its result will be thrust sleeve 46 in the beveled tip at near-end 42 places of NP sleeve pipe 40, and by the rubber chock plug on discharge pipe.

Because the flash of light of blood in the chamber 20 of chamber 26 and/or shell 12, IV sleeve pipe 30, NP sleeve pipe 40 and shell 12 are worked in coordination to provide and are entered venous and indicate in early days.Yet, also other flash designs can be included in the needle assembly of the present invention.These other design comprises such structure, and wherein, blood is filled in the suitable thing of the sleeve 46 on the needle assembly 10, flows into a flash of light chamber then.Also have other design to comprise the use porous plug.For example, the design that can hold flash of light chamber in the present invention is shown in United States Patent (USP) 5,542,932,5,824,001 and other patent in.

Needle assembly 10 comprises that also one is fixedly mounted in shell 12 proximal parts axle journal 50 on every side.Axle journal 50 can be fixed on the throne with mechanical means on shell 12, can be bonded on the shell 12, maybe can be molded as the part of shell 12.Axle journal 50 comprise a near-end 52, that aligns with the proximal part of chamber 20 basically be arranged on IV sleeve pipe 30 near-end 32 the proximal end and near the far-end 54 of the near-end of medial wall 24.Therefore, axle journal 50 will not weaken the ability in flash of light chamber 26 zones of the near-end 32 of observing adjacent I V sleeve pipe 30.The far-end 54 of axle journal 50 is provided with a C shape hook 56 that winds transverse to the axis generation of IV

sleeve pipe

30 and 40 extensions of NP sleeve pipe.Axle journal 50 is also comprising a chevron-shape protrusion 58 along diametric(al) with respect to the position of hook 56.Axle journal 50 preferably is fixed on the shell 12 so that one symmetrically by C shape hook 56 with by along the plane of the relative chevron-shape protrusion 58 of diametric(al) also symmetrically by inclined-plane at far-end 34 places of IV sleeve pipe 30.Yet in another embodiment, axle journal 50 is installed in rotation on the shell 12, so that can change by the plane on the inclined-plane at far-end 34 places of IV sleeve pipe 30 symmetrically with respect to one by hook 56 with by outstanding 58 planar orientation symmetrically.

Needle assembly 10 comprises that also one has the guard shield (shield) 60 of a near-end 62 and a far-end 64.The part of the guard shield 60 of located adjacent proximal end 62 comprises that one " click clatter " snaps in the swivel pin 66 that engages with hook 56, so that guard shield 60 can turn to as shown in Figure 5 make position from the open position shown in Fig. 1 and 2 with respect to hook 56.At open position, guard shield 60 and IV sleeve pipe 30 and align with IV sleeve pipe 30 with about 120 ° obtuse angle at interval.Axle journal 50 is with respect in the preferable orientation on the inclined-plane at far-end 34 places of IV sleeve pipe 30, and the clear indication of the preferable inclined orientation of an IV sleeve pipe 30 that is used by the technical staff of most of health service in use is provided.In addition, the orientation of the axle journal 50 on the shell 12 guarantees that guard shield 60 can not disturb in the observation of IV sleeve pipe 30 during insertion.The above-mentioned selection of rotatable axle journal can make user with respect to the inclined-plane at far-end 34 places of IV sleeve pipe 30, be placed to a preferable orientation of the armarium selection guard shield 60 that is communicated with patient with respect to patient and with respect to other.The part of the guard shield 60 of located adjacent proximal end 62 also comprises a roof 68 and the sidewall of giving prominence to from roof 68 70 and 72.Separate a distance at the sidewall 70 at guard shield 60 near-ends 62 places and 72 part, this distance equals or exceeds the width of the lateral wall 18 of shell 12.Therefore, along with guard shield 60 rotates in hook 56, sidewall 70 can rotate on the relative side separately of lateral wall 18 easily with 72.Also be convenient to the to glisten observation of chamber 26 of

sidewall

70 and 72 wide spacing.Sidewall 70 on guard shield 60 near-

ends

62 and 72 facing surfaces are formed with axle journal pallet (collar catch) 74 and 76 respectively.Axle

journal pallet

74 and 76 is configured to " click clatter " and snaps in herringbone door bolt 58 on the axle journal 50 and engage.The surface that roof 68 deviates from

sidewall

70 and 72 is provided with the tactile protrusions (tactile bump) of an array, so that the visual indication that provides an actuating that is used for thumb or forefinger fall to refer to, and when rotating guard shield 60 frictional engagement of raising and thumb or forefinger.

The position of guard shield 60 between roof 68 and far-end 64 is narrower, and forms roughly a U-shaped passage, and it has enough width and admits IV sleeve pipe 30.As Fig. 5 clearly shown in, passage 78 long enoughs are to contain whole IV sleeve pipes 30.The inside of passage 78 comprise one can be flexibly crooked cannula lock 80, it tilts towards relative sidewall and towards roof from a sidewall of passage 78.Along with guard shield 60 rotates towards IV sleeve pipe 30, cannula lock (cannula lock) 80 is crooked in order to contact with IV sleeve pipe 30.When the size of guard shield 60 cannula lock 80 during near make position further changes to move through IV sleeve pipe 30.Therefore, cannula lock 80 will flexibly return towards a unbending position, and IV sleeve pipe 30 is captured in the guard shield 60.Although all accompanying drawings illustrate one cannula lock 80, also a plurality of cannula locks can be set.In addition, cannula lock can extend from each two sidewall of U-shaped passage 80.Also can be provided with IV sleeve pipe 30 is locked in other various structures in the guard shield 60.This comprises other structure of cannula lock plastics or metal, and they are can be in order to contact with IV sleeve pipe 30 crooked, then, flexibly moves and catches IV sleeve pipe 30.Perhaps, cannula lock can require the certain user to activate form, for example, and the rotation of the part of guard shield or axially-movable.

Needle assembly 10 also comprises an IV guard shield 82 and a NP guard shield 84 that is installed in respectively on IV sleeve pipe 30 and the NP sleeve pipe 40 and frictionally remains on the axle journal 50.Guard shield 82 can be by applying suitable pulling force and/or slight twisting resistance separates with 84.

Use needle assembly 10, at first separate NP guard shield 84 from axle journal 50, the far-end 14 with shell 12 screws in the needle holder 86 then.Guard shield 60 turns to fully open position as illustrated in fig. 1 and 2 then, and wherein, guard shield 60 separates with IV sleeve pipe 30, and aligns with IV sleeve pipe 30 with about 120 ° obtuse angle.Then, IV guard shield 78 moves apart it and the engaging of axle journal 50.Bleeder imports to the far-end 34 of IV sleeve pipe 30 in the target blood then.Pressure reduction between the pressure in the vein in blood and the shell 12 will cause blood flow to cross the inner chamber 36 of IV sleeve pipe 30.After reaching blood vessel, blood is apparent in the flash of light chamber 26 soon.Because guard shield 60 is disposed and is aligned on the open position, so bleeder can be seen the blood in flash of light chamber 26.Then, bleeder is inserted into a discharge pipe 88 in the needle holder 86.Discharge pipe 88 comprises a rubber chock plug 90, and it falls into flat sleeve 46 at far-end.Its result, the near-end 42 of NP sleeve pipe 40 thrusts rubber bush 46, thrusts the stopper 90 of discharge pipe 88 then.Bleeder accumulates one or more blood samples by this way.

After gathering last blood sample, bleeder pushes needle assembly 10 and needle holder 86 from patient, and exerts pressure immediately on the roof 68 of guard shield 60 with thumb or forefinger.Its result, guard shield 60 rotates around hook 56 and enters a make position, and as shown in Figure 5, like this, IV sleeve pipe 30 is surrounded by the passage 78 of guard shield 60.Enough rotations cause cannula lock 80 to engage IV sleeve pipe 30 and bend.The further rotation of guard shield 60 causes cannula lock 80 by IV sleeve pipe 30, its as a result cannula lock 80 flexibly return towards unbent state, and catch IV sleeve pipe 30.Meanwhile, axle

journal pallet

74 and 76 " click clatter " snap in axle journal 50 on the engaging of herringbone door bolt 58 so that the sound and the tactile indication of guard shield have been finished in explanation.Then, it is discardable in a needle point container to implement the needle assembly of guard shield safely.

Needle assembly provides effective guard shield and does not hinder the use of needle assembly 10, and can not blur the observation of flash of light chamber 26.The high grade of transparency of flash of light chamber 26 partly ascribes spatial distal-most position between IV sleeve pipe 30 and the NP sleeve pipe 40 to and at the proximal location of the correspondence of the guard shield 60 of open position.In addition, as shown in Fig. 1 is clear, the near-end 62 of guard shield 60 open ground between

sidewall

70 and 72 is opened wide, so that a wide acceptable angular field of view to be provided.

Above-mentioned needle assembly has " click clatter " and snaps onto swivel pin 66 with guard shield 60 during C shape hook 56 on the axle journal 50 engages, so that guard shield 60 hingedly rotates with respect to axle journal 50 with respect to shell 12.Then, also can be provided with and be used for holding other structure of the pivotal motion of guard shield 60 with respect to axle journal 50 and/or shell 12.This comprises and axle journal 50 integrally formed guard shields 60 that like this, an active hinge connection is arranged between guard shield 60 and the axle journal 50.For example, a visible United States Patent (USP) 5,681,295 of guard shield that has a hinges.Hinged like this connection also can comprise a partial center hinge (over-center hinge), and wherein, guard shield is positioned at fully open position and complete make position basically not offsetly.Yet the process of the original state that turns to make position from open position, user must overcome bias force in the partial center hinge.Then, the partial center hinge flexibly returns towards a not offset state, and quickens hinge and shift to make position.

Claims

1. a needle assembly comprises: a shell, it has near-end and far-end and 1 is extending between two described ends forming the chamber wall of a chamber in described shell, and at least a portion of described chamber wall forms by observing the material that fluid flows in the described chamber; And, and the IV sleeve pipe that with described chamber be communicated with outstanding to far-end from described shell; One is hinged to the guard shield on the described shell, and it can be positioned on described guard shield and described IV sleeve pipe at interval and align and can observe an open position of described chamber, and described guard shield also can be turned to described guard shield and covers the telescopic make position of described IV.

2. needle assembly as claimed in claim 1 is characterized in that at least a portion of described chamber is arranged on the far-end of a position, and described guard shield hingedly is connected in described shell in this position.

3. the described needle assembly of claim 2, it is characterized in that, described IV sleeve pipe is communicated with the part of the described chamber of the described far-end of contiguous described shell, and described guard shield hingedly is connected in the part of the described shell of the described near-end of contiguous described shell basically.

4. profit requires 1 described needle assembly, it is characterized in that, described guard shield comprises at least one lock, engages with described IV is telescopic to lock when described guard shield is positioned at described make position.

5. needle assembly as claimed in claim 4 is characterized in that described guard shield comprises at least one pallet, to engage the part with the described hinged isolated described shell of connecting portion when described guard shield is positioned at described make position.

6. the described needle assembly of claim 5 is characterized in that, described at least one pallet that is used for engaging described shell on described guard shield is constructed to be permeable to produce sound and the tactile indication that forms guard shield.

7. needle assembly as claimed in claim 1 is characterized in that, also comprises one from the outstanding non-patient's sleeve pipe of described shell, and is communicated with described chamber.

8. needle assembly as claimed in claim 7 is characterized in that, described non-patient's sleeve pipe comprises that one is arranged on the far-end in the described chamber, and the telescopic described far-end of described non-patient is arranged on the far-end that is articulated and connected between described guard shield and the described shell.

9. the described needle assembly of claim 8, it is characterized in that, described non-patient's sleeve pipe extends through described shell fully, so that the telescopic described far-end of described non-patient generally is adjacent to the described far-end of described shell, the telescopic described far-end of described non-patient roughly aligns with described IV sleeve pipe, and spaced apart with described IV sleeve pipe slightly.

10. the described needle assembly of claim 1, it is characterized in that, described chamber wall is an exocoel locular wall, described shell comprises that also one forms the inner chamber wall of a flash of light chamber in described shell, the described proximal extension of described inner chamber wall from the described far-end of described shell towards described shell is so that described IV sleeve pipe is communicated with the described flash of light chamber that is formed by described inner chamber wall.

11. needle assembly as claimed in claim 10, it is characterized in that, comprise that also one is installed in the non-patient's sleeve pipe on the described near-end of described shell, described non-patient's sleeve pipe has one and charges into far-end in the described flash of light chamber from the outstanding near-end and of described shell near-end.

12. needle assembly as claimed in claim 1, it is characterized in that, described IV sleeve pipe has a far-end that has a flat basically inclined-plane that forms an end, described guard shield is hinged so that by a plane motion, and this plane matches with the symmetrical plane on described inclined-plane by the telescopic described far-end of described IV basically.

13. needle assembly as claimed in claim 1 is characterized in that, described shell comprises that one is installed in the axle journal on every side of a described shell part, and described guard shield is articulated in described axle journal.

14. needle assembly as claimed in claim 13 is characterized in that, described axle journal is fixed in described shell.

15. needle assembly as claimed in claim 13, it is characterized in that, described shell comprises a central axis that extends between described near-end and far-end, described axle journal is rotatable around described central axis, so as with respect to described IV sleeve pipe with a preferable rotational alignment to described guard shield orientation.

16. needle assembly as claimed in claim 13 is characterized in that, described axle journal is installed on the described shell in a position of described chamber near-end.

17. needle assembly as claimed in claim 13 is characterized in that, described guard shield and described axle journal form.

18. a maskable needle assembly comprises: a shell, the exterior side wall that it has a proximal end wall, a distal end wall and extends between described proximal end wall and distal end wall, described near-end and distal end wall and described lateral wall form a chamber in described shell, at least a portion of described exterior side wall is formed by the material of the substantial transparent of the described chamber of energy visualization; One has the IV sleeve pipe of a near-end, and it is installed on the described distal end wall of described shell, and a far-end of described housing exterior and an inner chamber that extends between the telescopic described near-end of described IV and far-end are communicated with described chamber; One non-patient's sleeve pipe has relative near-end and far-end, one inner chamber extends between two described ends, the telescopic described far-end of described non-patient is arranged in the described chamber, and the telescopic described near-end of described non-patient is arranged on outside the described chamber, described guard shield is pivotably mounted on the position of the far-end that is positioned at the telescopic described near-end of described IV on the described shell, described guard shield can expose from described IV sleeve pipe and turn to described guard shield in order to the open position that uses to cover described IV sleeve pipe unthinking by the make position of pinprick to prevent with described IV sleeve pipe, thus, the described guard shield of described open position can the contiguous described shell of visualization the part of described chamber of described proximal end wall.

19. but the needle assembly of guard shield as claimed in claim 18 is characterized in that described guard shield is hinged on the position of the described near-end that is close to described shell basically.

But 20. the needle assembly of guard shield as claimed in claim 18 it is characterized in that, the described guard shield of described open position be aligned in the spaced apart turned position of described IV sleeve pipe greater than 90 ° of angles on.

But 21. the needle assembly of guard shield as claimed in claim 20 it is characterized in that, also comprise at least one lock on described guard shield, be used for described guard shield is locked on the described make position.