CN101219252B - Safety tube center needle for insertion of intravenous injection catheter - Google Patents

Abstract

The invention relates to a metal delivery tube with a stylet mandrel (12) inserted into a device (10) and a syringe needle (14) extending from the stylet mandrel (12). A metal delivery tube (16) is provided with a intubatton (20) surrounding the syringe needle (14) and a connection sleeve (22) which is supported by a straightening part(24) at the front end of the stylet mandrel (12). A spring (44) puts backward pressure on the syringe needle (14). The syringe needle withholding part (14) with a releasable latching device is positioned in the stylet mandrel (12) and used for resisting the backward pressure of the spring (44) and keeping the syringe needle in an extending position. After the metal delivery tube (16) is inserted into blood vessel, a motivation part (64) extruding from the back end of the stylet mandrel (12) is exerted with a specific pressure. The latching device is released by the motivation part (64) while the syringe needle (44) is pushed by the spring (44); thereby the syringe needle (44) permanently is preserved in an inner chamber (72) of the stylet mandrel (12).

Description

The injection for intravenous catheter inserts the safe stylet of usefulness

Technical field

What the present invention relates to is a kind of insertion device of intravenous catheter, and it has a retractable entry needle so that entry needle can be screened immediately safely after using.The present invention is of great use in medical practice, is avoiding this device the operator by the danger of entry needle thorn after the insertion in order to intravenous catheter in a predetermined manner, thereby is improving safety.

Background technology

Intravenous catheter is used to carry out intravenous injection and transfusion to the patient in medicament administration, like hydration solution, and medicine, the using of blood products and nutrient.Intravenous catheter generally includes a flexible pipe, or claims that intubate, intubate have the tip that is placed within the patient vessel.Intubate extends to the external position of patient from the tip.Attached adapter sleeve in the outer end of intubate is in order to be connected to plug on the external device (ED) with convenient intravenous injection treatment.Usually, adapter sleeve is attached in order to transport the pipeline of the parenteral liquid that comes from a fluid supply.Pipeline can have one have anticoagulant reservoir (like a heparin lock blocking means) injection port, in order to for example interim dispenser.

Before inserting the patient, intravenous catheter is taken as the part of bobbin.Bobbin and then comprise that one has the stylet of entry needle.Entry needle extends through adapter sleeve and catheter sleeve pipe from stylet towards front end, and sleeve pipe is supported as the sleeve on the entry needle.Adapter sleeve is with can be removably and the matching towards front end of stylet.When there was intubate location on the tip of entry needle, the tip of entry needle promptly exceeded the insertion end of intubate and extends.

When being presented to the tip of catheter in the patient vessel, doctor or other medical workers hold the die needle body with one, puncture patient skin to be presented to the tip of intubate within the required blood vessel with entry needle.Typically should be low-angle with skin plane when obviously patient skin being punctured carries out.When using catheter to insert device, gripping of device normally is top-down posture, so that insert, at this moment, being gripped between doctor's the thumb and another finger of dominant hands, of stylet so that extend towards palm at the rear portion of stylet towards front end.Then, the entry needle that has a catheter intubate is directed to the skin that passes the patient and gets into required blood vessel.

The tip of entry needle is properly positioned within the required blood vessel normally uses " blood backflow " to indicate, this promptly, endovascular blood pressure is oppressed a spot of blood flow through the cylindric capillary tube between entry needle and catheter intubate.Observing after blood refluxes, as doctor during with another have gentle hands light press catheter, the stylet retraction, like this, entry needle can bounce back among intubate, intubate then still maintenance be positioned among the blood vessel.

After stylet retraction, on the position that the doctor is positioned catheter to insert with rubberized fabric adhere earlier usually, and then intravenous tube, perhaps the liquid locking device is attached on the adapter sleeve.Certainly, in order to paste catheter with adhesive plaster and to be connected to required device on the adapter sleeve.The doctor must put down stylet so that vacate a hands.Like this, the entry needle of black stylet is the sharp danger of an exposure always, has nursed the patient up to the doctor and has also handled stylet validly.Near other health care personnels possibly not notice the black entry needle of this exposure, and if may all of a sudden be pricked when running into entry needle.In addition, therefore the doctor also possibly all of a sudden pricked when handling entry needle.Past, this all of a sudden by the injection pinprick to situation be considered to the occupational inconvenience in a kind of routine work.Now, this situation then is considered to the communication media of fatal disease, and these fatal diseases comprise hepatitis B, human immunodeficiency virus (HIV), and the latter is associated with AIDS (AIDS).

If can design a kind of device or stylet that catheter inserts that be used for, its safety that after inserting out, can at once become from patient skin, that will be desirable.The trial that a kind of catheter that can avoid the unexpected thorn after use inserts device was set in the past comprises having the telescopic stylet that can lock with the mode of sliding, sleeve is in order to surround entry needle after using.Because this safety device is suitable for when the doctor only vacates a hands, actuating it most,, above-mentioned slidingtype or telescopic back and forth sleeve be difficult to actuate so just seeming.Therefore, a kind of catheter stylet if can be set, it only needs a hands to do a natural action, and does not need what manual dexterity property, can prevent promptly that entry needle from becoming a danger, and that will be desirable.

Moreover; Insert device if a kind of catheter can be set, it can provide a kind of and not take sb's mind off sth, yet but can easily be heard immediately; Touch; The affirmation mode of perhaps seeing is confirmed entry needle quilt cover, possibly the thorn health care personnel perhaps be responsible for the personnel's of the used entry needle of processing danger thereby no longer constitute one, and this will be even more ideal.

Summary of the invention

According to the present invention, designed a kind of device that inserts in order to catheter.This device has a shell, and the entry needle that extends out from the shell front end is arranged.There is a spring location in the enclosure, and in order to exert pressure to entry needle, it pushes entry needle among the shell when stretching.Spring is applied to power on the entry needle and receives an entry needle and hold and stay the part retroaction, and this is held and stays element to hold entry needle with the mode that can discharge to stay it and extend on the position of shell.There is an actuation mean location in the enclosure, and when a set pressure was applied on the actuation mean, actuation mean was replied and held entry needle and stays element to discharge.Actuation mean is outstanding to provide one can make the mobile in the enclosure plunger of actuator from the rear end of shell.Entry needle is held the posture that the release of staying element is achieved in that grip device when promptly still keeping catheter to insert, and pushes plunger towards palm.

Other new useful characteristics of the present invention will be obvious in description subsequently.

Description of drawings

Above-mentioned overview and detailed description subsequently if combine advantages, can obtain best understanding.In the accompanying drawings:

Fig. 1 is the sectional view that catheter of the present invention inserts device;

Fig. 2 A is the partial section of the amplification of the front end that inserts device of the catheter among Fig. 1, and catheter is removed;

Fig. 2 B is the sectional view fragment of the amplification of the rear end of inserting device of the catheter among Fig. 1;

Fig. 3 holds the decomposition diagram that stay device in order to the entry needle that the catheter that has the entry needle of spring to hold to stay among Fig. 1 inserts among the device to a load; And

Fig. 4 is a perspective view of holding another embodiment that stays element in order to the entry needle of the insertion of the catheter among Fig. 1 device.

The specific embodiment

Referring now to Fig. 1, shown in wherein is device of the present invention, is denoted as 10 generally.Device 10 can be known as bobbin or stylet.This device comprises that one can have the hollow shell 12 of different cross-sectional areas, extends an entry needle 14 from shell 12, and entry needle 14 has the protective cap 18 that a catheter 16 and surrounds the hollow of entry needle.Entry needle 14 is outward extending from the front end of shell.Catheter 16 comprises the pliable and tough intubate 20 of splaying, and it is positioned to serve as the sleeve of entry needle 14 outside the entry needle 14.The tip of entry needle 14, or claim front end, outside the front end of intubate, extend.Preferably splaying in the tip of entry needle 14, when entry needle inserts the patient, scratches patient's tissue preventing.Catheter 16 and then comprise that one attaches to the far-end of intubate 20, or claim rear end, adapter sleeve 22.The front end of shell 12 comprises alignment part 24 before, and its profile is configured to match mutually with adapter sleeve 22, and is inserted at catheter and for usely within the patient remains in the frictional fit state to catheter 16 and the cover 22 that is associated thereof removably before.

Refer to hold embossment, indicate by 26a and 26b generally, be formed at the offside towards front end 25 of shell 12.The profile of embossment 26a and 26b be designed to allow doctor or other health care professional can be cosily device 10 towards near the grip device front end 10, and preferably be gripped between the thumb and forefinger of doctor's habitual hands when using this type of device.Embossment 28a and 28b be formed at shell on front end 25, in the front that refers to hold embossment 26a and 26b, it is used for remaining on protective cap 18 on the device, preferably and be formed at holding on the inner surface of hollow cap 18 and stay groove 30 formation snap fit.Protective cap 18 extends forward so that before device 10 uses, surround and protection entry needle 14 from the front end 25 of shell.

Referring now to Fig. 2 A, shell 12 towards front end or front end by bright more details to show.The front end 25 of shell has the axial hole 32 that is formed at wherein.The size in axial hole 32 is made into can accept preceding alignment part 24.Before alignment part 24 through rubbing action closely be engaged in axial hole 32 within the forward part.The location of alignment part within the front portion in axial hole 32 can further reinforced through epoxy resin or ultrasonic welding.Alignment part 24 is normally cylindraceous, and an axial hole 38 cylindraceous is arranged.Part 40 that axial hole 38 has a diameter to dwindle, its provide one be suitable for holding entry needle 14 opening.The part 40 of reduced also provides an annular inner surface 42, and it serves as the butting section towards front end of compressing spring 44.

Before the rear end of alignment part 24, or claim rearward end, adjoin mutually with the part 34 that the diameter towards the axially open of front end 25 through shell 12 dwindles.In the reduced part 34 in the axial hole 32 within the front end 25 of shell 12, closely hold and keep an entry needle and hold and stay element 36.Entry needle is held and is stayed the rearward end of alignment part 24 before the nestling up towards front end of element 36, entry needle to hold the rearward end of staying element 36 to be provided with one generally with the latch and lockset lyatem of 45 signs.Latch and lockset lyatem preferably is provided with many with the latch projection of 46 signs or the finger of buckle, and they are formed at entry needle and hold the rear end of staying part.Finger 46 is held the rear end of staying part 36 from entry needle and is extended into the part of outwards splaying of inside of shell 12 of junction 25a between the front portion of the reduced of cylindrical portions may 33 that diameter increases and shell 12.Cylinder extends back through the residue length of shell 12.Latch projection, or the finger 46 of title buckle, more specifically saying so has the hook integrally formed with it 56 in its end.Hook 56 is and extends radially inwardly so that keep the location to entry needle, and this will further describe subsequently.What in this preferred embodiment, adopt is four finger, and as shown in Figure 3, but according to the device size size, the character of spring 44 and other tangible variable can adopt more or less latch projection.

Entry needle keeper 36 is a hollow, to hold entry needle 14 and to be paperwrapped in its outer spring 44.Obviously, the axial hole of entry needle keeper, or claim the dead zone, and with the axial hole of preceding alignment part 24, or claim opening, consistently extend, to hold entry needle 14 and the spring 44 that is associated.The structure of entry needle comprises the head 50 that an entry needle 14 and an attached diameter on it increase.The head 50 of entry needle serve as one with the latch projection, or claim finger 46, crew-served latch spare.Entry needle head 50 comprises that one has the enlargement steps down of annular towards front surface 52, and it provides a butting section 55 for the rear end of spring 44, and spring is compressed in the butting section 42 of butting section 55 on preceding alignment part 24.Entry needle head 50 comprises another surface, butting section 57, and it forms one and keeps and hook 56 or finger 46 immediate flange or edges.Like this, spring 44 just be held be compressed in entry needle head 50 towards between the inner surface backwards 42 of front surface 52 and preceding alignment part 24, tend to push entry needle to the rear portion of device.

The decomposition view of Fig. 3 shows best that clear entry needle is held and stays part 36, entry needle head 50, the co-operating relation of entry needle 14 and spring 44.As discussing the front, entry needle is held and is stayed element 36 to comprise that its terminal has finger or the latch projection 46 of extending of hook 56 backwards.Finger 46 is preferably flexible, thus with allow their outwards motion make the latch projection discharge the collaborative mutually latch butting section 57 on the entry needle head 50.And obviously, in the time will outwards moving finger with release entry needle head, finger can be fractureed.Hook 56 provides a matching surface 60, and it radially extends into axial hole 38 so that match with the surface, butting section 57 of entry needle head 50.

Be appreciated that when finger 46 distortion or be radially outwards warpage, so the matching surface 60 of hook 56 will by move apart with the surface, butting section 57 of entry needle head 50 near the position.Like this, the compression stress on the front surface 53 that spring 44 is pressed to entry needle head 50 i.e. push injection needle section 50 promptly, thereby push injection pin 14 advances towards the rear portion of device backward.Once more with reference to Fig. 2 A, an actuator 64 slidably is positioned within the cylinder 33 of shell 12 so that remove the mated condition of latch structure, thereby discharges entry needle head 50, and then entry needle is retracted among the device fully.

Being made into certain profile or being made into wedge-like towards front end 64a of actuator 64 is used for matching mutually with the cooperation surface 58 of making wedge-like of hook 56, thereby so that expands the release latch structure that comes to finger 46.More specifically, actuator 64 preferably have splay towards front end 66, when being pushed forward among the cylinder 33 of actuator at shell 12, it matches with the inclined plane 58 of hook 56 with complementary mode.The advance the puck of actuator 64 causes finger 46 through warpage or the expansion of fracture outward radial, thereby discharges the entry needle head.When the entry needle head was released, entry needle was pushed the hole 70 on the front end through actuator 64 backward by spring.

An O type ring 74 is held within the annular recess around actuator, and it is between the inside of actuator and cylinder 33 and is slidingly matched.The setting of O type ring makes hole 70 can keep aliging with the entry needle head, so that entry needle can have no the ground of obstruction retraction.Alternatively, actuator also can be made into and is linked among the cylinder, and keeps alignment through the slipper seal of integral body.

Entry needle is held and is stayed an alternate embodiment of element 36 to be shown among Fig. 4, and wherein similar with the element shown in Fig. 3 element is represented with same reference numerals, but added apostrophe " ' above that ".Latch projection and finger 46 ' and entry needle hold the hook 56 ' that stays element 36 ' be bonded together effectively form one a circular open arranged on its top or rear end annular latch spare.Hold and stay element to be provided with V-type longitudinal fluting 47, it extends towards the rear end with convenient actuator outside and splits latch surface 58 '.The matching surface 60 ' on hook surface 56 ' is held to stay at entry needle and is formed a successive edge in the element 36 ', to strengthen the fastness that it cooperates with the entry needle head.Successive edge and entry needle head sealed to each other towards back edge, thus make liquid can't get into the entry needle intracavity.Moreover; One is radially outstanding shoulder 49 holds the outside formation of staying element 36 ' around entry needle; In order to complementary embossment (not shown), hold and stay element to advance backward to prevent the expansion force that it is compressed spring in order to tighten up entry needle near the stylet enclosure.When splaying of actuator 64 held 58 ' the last time of inclined surface that is pressed to hook surface 56 ' by enough power; It 56 ' is gone up and formedly splits the latch end of keeper along groove 47 to extraradial power on hook surface, so that the maintenance end of keeper or latch end break off.More specifically, putting on further pressure on the actuator forces latch to form the fragment of separating along groove 47 through outside warpage and radial and outward deformation perhaps discharges the entry needle head through fractureing the fragment of separating of latch end.

Before stylet and catheter insertion patient, and when inserting, actuator 64 remains on a fixed position, so entry needle can't bounce back prematurely.Best, actuator 64 is held to be stayed on first in cylinder or the position backwards, thereby the rear end of actuator is outstanding from the rear portion of cylinder 33, shown in Fig. 1 and Fig. 2 B.Moreover, in the injection needle restoring auto levelizer after, actuator preferably still keeps lock-out state and is retained in its second or position forward in cylinder, to prevent to touch entry needle that make dirty or used.The dibit locking device of the rearward end of these two targets through being arranged at device realizes, as the enlarged drawing among Fig. 2 B the most clearly show bright.

There is an opening rear end of shell 25 in order to when assembling this device, to be undertaken in actuator 64 within the cylinder 33.One first locking projection portion 76 is arranged on actuator 64, and it stretches out from the outside of actuator 64, is flange shape or dentation.The first locking projection portion 76 extends outside the inside diameter of cylinder slightly and forward an inclined surface is arranged on it, with allow jut 76 can be oppressed or pushing and be engaged on the inner surface that is formed at cylinder around groove 78 within.One edge 80 is formed at the inside of cylinder and towards the opening between the opening of groove 78 and cylinder 33.The second locking projection portion 84 is formed in the outside of actuator around the circumferential of actuator 64.The second locking projection portion 84 is positioned at the back of the first locking projection portion.When actuator in the process of assembling stylet when being located within the cylinder 33, edge 80 be stuck in the first locking projection portion 76 back surface and the second locking projection portion 84 towards between the front surface.Like this, actuator thereby be maintained at first fixed position in the cylinder so that the initial use that device can supply catheter to insert.

The second locking projection portion 84 towards front surface 84a at an angle or the slope be complementary with complementary rearward face 80a at an angle with edge 80.Actuating in the process of injection needle restoring; Actuator is pushed ahead by enough power in cylinder 33 inside; And, the second locking projection portion 84 is got among the cylinder 33 by the radial deformation power that interacts between the flange 80 and second locking projection portion 84 surface at an angle.Final because the rearward end of shell 12 of actuator successive advance the puck in cylinder and the occipital annular stop portion 86 that is formed at actuator 64 near and stop.In other words, when actuator 64 was advanced in the cylinder 33 forward, the second locking projection portion was stuck among the groove 78, can listen fully and obtained showing the sensation that entry needle has bounced back with sense of touch obtains thereby made one.Like this, whether the doctor has not been required to be the affirmation entry needle and bounces back and observe stylet 12.

Realizing that the required power of retraction is enough big, so that the probability of unexpected too early retraction drops to is minimum, yet also is enough little, so that the ordinary person can be realized bouncing back with a hands.Refer again to Fig. 1, the retraction of entry needle 14 is preferably realized through pushing the enlarged head of actuator 64 or stop part 86 towards palm.As foregoing, being propped up between the thumb of dominant hands and forefinger refer to of stylet in use towards front end, this moment aligns with palm in the rear portion of stylet.In order to realize retraction, the doctor only needs following thumb that grips of the situation about normally gripping of stylet and forefinger to be got final product towards the palm flexing keeping.Like this, the doctor needn't be in the state of injection needle restoring in order to make stylet, perhaps takes sb's mind off sth from taking care of the catheter that has inserted for obtaining the conclusive evidence that safety device has been actuated.Alternatively, the retraction of the entry needle technology that can be applied to the rearwardly projecting head of actuator 64 through other the actuating pressure with set realizes.

When actuator 64 has been removed latch projection or finger to open or when discharging the latch surface of entry needle head, entry needle promptly is released retraction.After the entry needle head was released, spring handle entry needle head and attached entry needle advanced or launch within the cylinder, and specifically are to get within the cavity 72 of actuator 64.Certainly, device size is configured to allow the total length of entry needle to be undertaken within the device, so that after injection needle restoring, any part is in the past not outstanding in the alignment part 24.

One outlet bolt 90 is positioned the open rearward end place of actuator 64, and is suitable for the rear end of sealed chamber 72.The outlet bolt is preferably made with elastic porous material, and it allows air when blood refluxes, from chamber 72, to escape.Outlet bolt 90 preferably should be suitable for when moistening, getting clogged, and leaks out from the rear end of stylet so that prevent blood.In alternate embodiment; As long as the volume of chamber 72 is enough big; So that the counter-pressure that can't reduce owing to the volume of the fashionable chamber of blood flow and in chamber, form that refluxes blood is hindered significantly, and the rear end of chamber 72 is that available sealed solid spare seals so.Shell 12 is preferably transparent with actuator 64, can easily observe the backflow of blood to allow user.

For person skilled in the art, obviously can the device that this place discloses further be added or revise.Moreover term used herein is the term that is used as description with expressing, and does not have limitation.When using these terms and expressing, have no intention to get rid of any counterpart shown here or said description and illustrated characteristic and ingredient thereof.In the scope of claim of the present invention, still can carry out various modifications.

Claims (13)

1. one kind is used for the device that intravenous catheter inserts, and this device has band and forms the shell of the front end that cooperates with the cover of catheter, and is provided with entry needle supporting and the guiding catheter intubate intravasation that extends from the front end of shell; The spring that is positioned at shell is used to apply a power and on entry needle, holds and stay element to be used to overcome spring force to hold entry needle releasedly and stay it from position that shell stretches out to force pin to get into shell and entry needle; This device is characterised in that:

Actuator; The location in the enclosure and the plunger end with the rear end that extends beyond shell be used to hold and stay actuator; Actuator remains on primary importance and can move to the second position to discharge actuator from primary importance from primary importance release and the predetermined pressure of response on plunger end; Wherein actuator remains on primary importance by the first locking projection portion; The first locking projection portion stretches out from the outside of actuator and fits in the groove that is formed on enclosure; Wherein actuator remains on the second position by the second locking projection portion; The second locking projection portion is positioned at after the first locking projection portion and stretches out from the outside of actuator, and wherein actuator can apply predetermined pressure through the longitudinal axis along shell and move to the second position from primary importance on plunger end, thereby entry needle is released and is pressed into shell through spring;

The chamber that actuator has the band open front is used for after entry needle is pressed into shell through spring, receiving and holding entry needle.

2. according to the device of claim 1, wherein this chamber is positioned at actuator.

3. according to the device of claim 2, wherein shell is transparent in to allow the blood in the visual inspection chamber.

4. according to the device of claim 3, wherein actuator is transparent in to allow the blood in the visual inspection chamber.

5. according to the device of claim 2, wherein the front end of this chamber was an opening before actuator moves.

6. according to the device of claim 1, comprise the porous outlet bolt of an end of a sealed chamber.

7. according to the device of claim 1, wherein actuator is configured to engage ordinatedly entry needle and holds and stay part.

8. one kind is used for the device that intravenous catheter inserts, and comprising:

The shell of a hollow;

An entry needle that extends from shell;

A catheter that is contained on the entry needle, wherein entry needle can be operated during inserting the patient, to support and the guiding catheter;

The spring of bias voltage entry needle backward;

A latch and lockset lyatem can be operated to hold entry needle releasedly with the power that overcomes spring and stay it from position that shell stretches out;

An actuator that is positioned at shell; This actuator can be operated between the primary importance and the second position; Making latch and lockset lyatem hold in the relative latch and lockset lyatem of primary importance actuator location stays entry needle at extended position; Engage latch and lockset lyatem to actuate the retraction of entry needle at second position actuator, wherein actuator can apply predetermined pressure through the longitudinal axis along shell and move to the second position from primary importance on plunger end;

Be used for holding releasedly and stay the device of actuator in primary importance.

9. according to Claim 8 device wherein is used for holding releasedly the device that stays and comprises the cooperation ratchet that is associated with actuator and shell.

10. according to Claim 8 device comprises being used for forever holding basically and stays the device of actuator in the second position.

11. device according to Claim 8, wherein actuator can move axially between first and second positions.

12. device according to Claim 8 wherein is used for discharging and holds the device that stays and reply predetermined motivator and discharge actuator to move.

13. device according to Claim 8 comprises that a chamber in the enclosure is used for receiving during use a certain amount of blood and correctly is arranged in patient's body with the indication entry needle.

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