CN202236662U - Catheter flusher with prefilled liquid - Google Patents

Abstract

The utility model relates to the technical field of medical apparatus and instruments, in particular to a catheter flusher with prefilled liquid consisting of a cylinder, a push rod, liquid and a piston. The cylinder and the push rod are respectively provided with a locking and stopping assembly consisting of a cylinder lock and a rod lock and being capable of buckling to ensure that the catheter flusher is limited by the buckled locking and stopping assembly and cannot withdraw while finishing flushing through pushing and injecting the liquid, so that the piston which deforms through extrusion in the flushing process is pressed and rebounded due to incapability of releasing potential energy, and a vacuum zone cannot be formed, thus, the aim of preventing blood from returning when a catheter is flushed is achieved.

Description

A kind of catheter flusher of preliminary filling liquid

Technical field

This utility model relates to technical field of medical instruments, is specifically related to a kind of catheter flusher of preliminary filling liquid.

Background technology

PICC classifications such as remaining needle, dark venous duct, new peripheral catheters are kept somewhere the medical apparatus extensive use in recent years in blood vessel; Also cause many negative issues when offering convenience, insert blood vessel because of it and cause blood back, finally cause thrombosis or phenomenon of blocking of common occurrence; Become an outstanding nursing difficult problem and transfusion risk; Nurse industry for this reason and on the basis of clinical experience, form the common recognition that transfusion back inlying catheter must be taked to wash and the malleation tube sealing is handled gradually, promptly carried out the flushing liquors such as heparin sodium aqua or sodium chloride solution that adopt syringe to inject preparation voluntarily thereupon and carried out catheters irrigation, obtain certain improvement preventing conduit thrombosis or obstruction that blood back causes; Clogging obviously reduces; But new problem is following again, and to these new problems, the experiment of calendar year 2001 shows; Using ampoule bottle and disposable syringe and the syringe needle of single dose to prepare flushing liquor has 8% flushing liquor contaminated; These contaminated flushing liquors can cause the bacteremic generation of Secondary cases (seeing Worthington T, et al.doi:10.1053/jhin.2001.1031), for this reason; U.S. company BD has been developed the pre-filled catheter flusher of commodity " happinesses of PosiFlush good fortune come " by name; The technical scheme of this product adopts the mode of the laggard capable terminal sterilization of preliminary filling liquid to eliminate the side effect of manual preparation washing pipe liquid, takes the design of lock piston stop ring to overcome the relevant blood back of syringe, forms thrombosis after avoiding forming washing pipe.

The notion of the relevant blood back (Syringe-induced blood reflux) of so-called syringe is at first proposed by U.S. educational circles; Referring to its piston of syringe that is used for catheters irrigation is the rubber material; Inject the piston distortion that can be squeezed of when flushing; When injecting the pressure release of end back; The part that piston is squeezed will resilience and produce one and cause blood to get back to the region of no pressure in the conduit, and it occurs in behind the terminal phase of intravenous injection in the catheters irrigation tube sealing process, and syringe piston is shifted this stage of syringe head end onto.

To avoiding of the relevant blood back of syringe; The lock piston stop ring technical scheme that the pre-filled catheter flusher of PosiFlush is taked; Specifically be on the basis of conventional syringe piston, to increase piston length and contact ring; The frictional force of piston and syringe cylinder intracoelomic cavity perisporium is increased, thereby prevent that the piston release pressure that is pulled to the irrigator head end and has produced crimp from forming the region of no pressure, prevents blood back with this.The pressure that this technical scheme is understood crimp simply discharges with piston as a whole and takes place, and the in fact compression of rubber material, and its pressure discharges can local generation; Increasing frictional force stands fast piston; Being to realize through the lock ring of contact irrigator inner chamber perisporium, in fact only is that lock ring stands fast, and does not mean that external force cancels the not resilience of piston main body of back support lock ring; This is an obvious defects; Even ignore this defective, also can give to inject when increasing frictional force and bring excessive resistance, cause the hard and difficult of practical application.

The utility model content

The purpose of this utility model is the defective to above-mentioned background technology, provides a kind of and forms the region of no pressure to prevent that pressure from discharging, and can realize avoiding the be correlated with catheter flusher of preliminary filling liquid of blood back of syringe really as to perfectly.

The purpose of this utility model is achieved in that

A kind of catheter flusher of preliminary filling liquid comprises cylindrical shell 1, push rod 2, piston 3, liquid 4, union joint 11 and union joint sheath 12, and said cylindrical shell 1 is that head end links to each other with union joint 11; The hollow pipe of tail end opening; Tail end has an and gripper rings 13 of outwards blowing out concordant with opening cross section of living in, and said union joint 11 is one to link to each other with the inner chamber of cylindrical shell 1 and connect hollow pipe, said union joint sheath 12 11 outer end that are tightly connected; Said push rod 14 is that an end is provided with a push pedal 21; But the other end stretches into the core bar of cylindrical shell 1 inner chamber and head-end slip, the wherein said piston 3 fastening front end that push rods 14 stretch into part, the perisporiums of piston 3 sealed cylinders 1 inner chamber of being installed in; Cylindrical shell 1 inner chamber of said liquid 4 preliminary fillings between union joint 11 and piston 3; It is characterized in that the catheter flusher of said preliminary filling liquid is provided with the lock assembly that anti-throw-out lever 2 is retreated to cylindrical shell 1 tail end direction, said lock assembly ends 22 by the tube locking 14 that is arranged at cylindrical shell 1 with the lever lock that is arranged at push rod 2 and forms.Said tube locking 14 is arranged at the internal chamber wall of cylindrical shell 1 tail end, and said lever lock ends 22 push rod 2 outer ends that are arranged near push pedal 21.

Of background technology; The relevant generation with blood of syringe is because syringe or catheter flusher are injected washing pipe liquid washes in the tube sealing process; Piston 3 extrusions also form that the region of no pressure causes injecting eventually last release pressure resilience; Therefore its key is to eliminate the generation of region of no pressure, and the generation of region of no pressure then results from the resilience after piston 3 distortion.Will inject the liquid 4 of catheter flusher preliminary filling and keep somewhere in endovascular conduit, based on the existence of frictional force, intravascular pressure, overcoming these resistances needs an external force; The action of injecting has applied such external force, makes to be in the piston 3 of injecting key position and to bear the pressure of external force same intensity therewith, and total institute is known; The piston 3 of rubber material is a nonrigid material, when bearing pressure, regardless of degree; All certainly lead to crimp, it promptly as hard pressed spring, has produced the potential energy of resilience; The present technique scheme is provided with the lock assembly that anti-throw-out lever 2 is retreated to cylindrical shell 1 tail end direction dexterously, and the potential energy that constrains piston 3 resiliences can't discharge.

Said lock assembly is locked 14 by the tube that is arranged at cylindrical shell 1 and is ended 22 with the lever lock that is arranged at push rod 2 and forms, and tube locking 14 is arranged at the internal chamber wall of cylindrical shell 1 tail end, and lever lock is 22 push rod 2 outer ends that then are arranged near push pedal 21 only; They are one group and cooperatively interact and reach restriction push rod 2 and injecting the eventually last member that can't retreat that push rod 2 parts are pulled out during pre-assembled, make lever lock end 22 be in a locking 14 far-end; When promoting push rod 2 and sliding toward cylindrical shell 1 inner chambers both gradually near, when piston 3 arrived the head end of cylindrical shells 1 inner chamber, lever lock ended 22 and sticks into a locking 14 just; Again because said tube locking 14 profiles are continuous or one group of alternate annular protrusions; It is that an end links to each other with push rod 2 that said lever lock ends 22, and near the fishbone configuration that the other end of push pedal 21 separates with push rod 2 and slightly outwards sticks up, lever lock ends 22, and stick into promptly can't be oppositely mobile to injecting direction behind the locking 14; Piston 3 was in and was extruded deformation state this moment; Not release pressure and resilience of piston 3 when lock assembly is had an effect cancelled even therefore promote the external force of push rod 2 this moment, and it is constant that the piston 3 of push rod 2 and push rod 2 front ends all still is in the state that is extruded distortion; The same when not cancelling just as external force; Do not possess the condition of release pressure and can't discharge the potential energy that it is contained, the distortion of piston 3 can't resilience, therefore also can't form the region of no pressure at the cylindrical shell 1 inner chamber head end of catheter flusher; Naturally can when irrigating catheter, not cause the said syringe blood back of being correlated with yet, realize the purpose of this utility model.

This utility model technique scheme also has a significant usefulness: because said union joint 11 is locking type outer cone joints of 6: 100 taperings, it is provided with the female thread screw thread, and union joint sheath 12 is female cone joints of 6: 100 taperings; It is provided with the external screw thread screw thread, and the connection of union joint 11 and inlying catheter or separate is what the mode with precession and back-out realized, because union joint 11 is with before conduit separates; Whole tract is airtight and exists and the isobaric pressure of blood pressure at least; It is gentle that it screws out isolating mode, and avoided directly when extracting, producing pumpback formula negative pressure and caused blood back, and because in isolating moment; Act on piston 3 and union joint 11 inner chamber residual liquids, disappear with the isobaric pressure of blood pressure; Then with respect to union joint 11 inner chamber residual liquids, the tract internal pressure that connects before isolating moment makes it is unbalance, residual liquid 4 meeting transient flow conductive pipe; Reach the isolating effect of malleation, can effectively prevent time of releasing bad student's disconnection property blood back.

Because being unidirectional anti-throw-out lever 2, the integrated structure of said lock assembly retreats toward cylindrical shell 1 tail end; For prevent a locking 14 and lever lock end 22 engage have an effect after; External force is difficult to cancel in lock assembly engaging moment realization synchronously; And make push rod 2 unpredictably continue toward cylindrical shell 1 head end to advance, thereby aggravation piston 3 deformation extents make push rod 2 cross the restriction of lock assembly; After cancelling, external force then just prevented behind the push rod 2 slow asterns stroke by lock assembly; The consequence that finally causes the purpose failure of this utility model, the end of said tube locking 14 cavity direction to cylindrical shell 1 in and the length in gripper rings 13 outsides equal lever lock and end 22 length to end with push pedal 21 inboards of push pedal 21 directions, and this setting makes a locking 14 and lever lock only 22 move that realization engages and moment of having an effect; The inboard outside that also touches the set gripper rings 13 of cylindrical shell 1 tail end simultaneously of the push pedal 21 that push rod 2 outer ends are set makes push rod 2 stopped by gripper rings 13 and can't continue unpredictably to advance.

Obviously, the suffered extruding of piston 3 is big more, and its potential energy with bullet is just big more; The region of no pressure that causes so is corresponding also big more, and the blood back that causes is also just many more, for fear of piston 3 after arriving cylindrical shell 1 inner chamber head end; Still receiving external force advances; Crimp when making its distortion not only receive previous liquid 4 and inject also increases the distortion with the extruding of cylindrical shell 1 head end inwall on this basis, and said piston 3 to push pedal 21 inboard length are less than or equal to the length of cylindrical shell 1 inner chamber; This is provided with effectively avoids producing extra, the non-essential distortion that is brought with the extruding of cylindrical shell 1 head end inwall, helps to reduce the region of no pressure and causes the risk with blood.

Based on the consideration that reduces piston 3 deformation extents, the front end of the inner chamber of said piston 3 and push rod 2 all is set to the spiral screw thread equally, and its installation is the interior screw thread 31 that the male thread 23 of push rod 2 screws in piston 3; Such mounting structure helps both driving fit to put in place, and especially significant benefits is, the male thread 23 screw-in modes of push rod 2; Can be fully and the interior screw thread 31 of piston 3 coincide; Farthest enrich piston 3 and reduce the space, reduce that there is the space in piston 3 and the chance that increases deformation extent, simultaneously; It is above-mentioned that both combine with the installation of screw thread mode; At the piston 3 of can in cylindrical shell 1, packing into earlier on the technology of preliminary filling liquid 4, screw in push rod 2 behind the filling liquid 4 again, be easy to realize scale of mass production.

Wherein, Said tube locking 14 profiles are continuous or one group of alternate annular protrusions; And realize as the purpose of this utility model; The annular protrusion of a continuous whole or one group of alternate at grade annular protrusion can be realized, and as preferred, the annular of continuous whole protrusion then more helps using.When the composing quantity that said lever lock ends 22 fishbone configurations is one or two or one group; All can realize the purpose of this utility model; As preferably; More help the balance of lock assembly locking push rod 2 when quantity is one group, and minimumization of simple and easy, the cost of taking into account that technology realizes and stable performance the two the time, lever lock ends 22 fishbone configuration quantity the best when being two.

The principle of technical scheme that this utility model proposes is such: utilize the tube locking 14 be arranged at cylindrical shell 1 respectively and the lever lock that is arranged at push rod 2 to end 22 lock assemblies that constituted; When promoting push rod 2 conductive pipe injection preliminary filling liquid 4 to whole end; Tube locking 14 and lever lock end 22 and engage and produce and limit push rod 2 and retreat in moment; Thereby the piston 3 of compacting crimp makes it to discharge the potential energy resilience, avoids forming the region of no pressure and causes blood back.

The technical scheme that this utility model proposes; Simple possible; Definite effect is visible; Can realize preventing the problem of the relevant blood back of syringe perfectly, avoid again influencing the sliding capability when injecting so that the lock piston stop ring to be set with the mode that increases frictional force, be a kind of catheter flusher technical scheme of ideal preliminary filling liquid.

Description of drawings

Fig. 1 is the structural representation of this utility model technical scheme assembling completion status.

Fig. 2 is the structural representation of this utility model technical scheme after using.

The specific embodiment

Below in conjunction with accompanying drawing the technical scheme of this utility model is done further and to be specified.

The catheter flusher of preliminary filling liquid shown in Figure 1; Comprise cylindrical shell 1, push rod 2, piston 3, liquid 4, union joint 11 and union joint sheath 12, said cylindrical shell 1 is that head end links to each other the hollow pipe of tail end opening with union joint 11; Its tail end has an and gripper rings 13 of outwards blowing out concordant with opening cross section of living in; Said union joint 11 is one to link to each other with the inner chamber of cylindrical shell 1 and connect hollow pipe, said union joint sheath 12 11 outer end that are tightly connected, and said push rod 2 is that an end is provided with a push pedal 21; But the other end stretches into the core bar of cylindrical shell 1 inner chamber and head-end slip; The wherein said piston 3 fastening front end that push rod 2 stretches into part, the perisporium of piston 3 sealed cylinders 1 inner chamber, cylindrical shell 1 inner chambers of said liquid 4 preliminary fillings between union joint 11 and piston 3 of being installed in; It is characterized in that; The catheter flusher of said preliminary filling liquid is provided with the lock assembly that anti-throw-out lever 2 is retreated to cylindrical shell 1 tail end direction, and said lock assembly ends 22 by the tube locking 14 that is arranged at cylindrical shell 1 with the lever lock that is arranged at push rod 2 to be formed, and said tube locking 14 is arranged at the internal chamber wall of cylindrical shell 1 tail end; Said lever lock ends 22 push rod 2 outer ends that are arranged near push pedal 21; Wherein, the end of tube locking 14 cavity direction to cylindrical shell 1 in and the length in gripper rings 13 outsides equal lever lock and end 22 length to the end and push pedal 21 inboards of push pedal 21 directions, and the length of piston 3 to push pedal 21 inboards are less than or equal to the length of cylindrical shell 1 inner chamber.

When the catheter flusher of present technique scheme uses, screw out union joint sheath 12, grip cylindrical shell 1 and screw in the catheter interface that connection needs flushing with union joint 11; Prop up gripper rings 13 with forefinger and middle finger, liquid 4 irrigating catheters are injected in thumb press push pedal 21; When the piston that is positioned at push rod 2 front ends 3 arrives the head end of cylindrical shell 1 inner chamber; Lever lock only 22 sticks in the locking 14 immediately, makes the lock assembly engaging and plays the locking effect, and push pedal 21 simultaneously receives gripper rings 13 restrictions and can't continue to advance; Stop this moment promoting to accomplish flushing, grip cylindrical shell 1 turn union joint 11 and separate the said catheter flusher of this utility model.Because the effect of lock assembly; The piston 3 of extrusion is in use accomplished the back in flushing and is separated with conduit until this catheter flusher, all is pressed and can't resilience formation region of no pressure; So can not cause the said syringe blood back of being correlated with yet, realize the purpose of this utility model.

Although the technical scheme of this utility model is to describe with reference to specific embodiment, this description does not also mean that the restriction of this utility model formation.Description with reference to this utility model; Other variations of the disclosed embodiments; Like principle according to this utility model, change the position that is provided with of lock assembly, or the composition pattern of change lock assembly etc.; These variations can expect all that to those skilled in the art this variation should belong in the affiliated claim institute restricted portion.

Claims (9)

1. the catheter flusher of a preliminary filling liquid; Comprise cylindrical shell (1), push rod (2), piston (3), liquid (4), union joint (11) and union joint sheath (12), said cylindrical shell (1) is that head end links to each other the hollow pipe of tail end opening with union joint (11); Its tail end has an and gripper rings (13) of outwards blowing out concordant with opening cross section of living in; Said union joint (11) is one to link to each other with the inner chamber of cylindrical shell (1) and connect hollow pipe, said union joint sheath (12) head (11) outer end that is tightly connected, and said push rod (2) is that an end is provided with a push pedal (21); The other end stretches into cylindrical shell (1) but the core bar of inner chamber and head-end slip; The fastening front end that push rod (2) stretches into part, the perisporium of piston (3) sealed cylinder (1) inner chamber, said liquid (4) preliminary filling cylindrical shell (1) inner chamber between union joint (11) and piston (3) of being installed in of wherein said piston (3); It is characterized in that the catheter flusher of said preliminary filling liquid is provided with the lock assembly that anti-throw-out lever (2) is retreated to cylindrical shell (1) tail end direction.

2. according to the catheter flusher of the said preliminary filling liquid of claim 1, it is characterized in that, said lock assembly by the tube locking (14) that is arranged at cylindrical shell (1) and the lever lock that is arranged at push rod (2) only (22) form.

3. according to the catheter flusher of the said preliminary filling liquid of claim 2, it is characterized in that said tube locking (14) is arranged at the internal chamber wall of cylindrical shell (1) tail end, said lever lock ends (22) and is arranged at push rod (2) outer end near push pedal (21).

4. according to the catheter flusher of claim 2 or 3 said preliminary filling liquid; It is characterized in that; Said tube locking (14) profile is continuous or one group of alternate annular protrusion; It is that an end links to each other with push rod (2) that said lever lock ends (22), and near the fishbone configuration that the other end separates with push rod (2) and summary is outwards stuck up of push pedal (21), its quantity is one or two or one group.

5. according to the catheter flusher of claim 1 or 2 or 3 said preliminary filling liquid; It is characterized in that the length in the end of tube locking (14) cavity direction in cylindrical shell (1) and gripper rings (13) outside equals lever lock and ends (22) end and inboard length of push pedal (21) to push pedal (21) direction.

6. according to the catheter flusher of the said preliminary filling liquid of claim 1, it is characterized in that the front end of the inner chamber of said piston (3) and push rod (2) is the spiral screw thread, its installation is the interior screw thread (31) that the male thread (23) of push rod (2) screws in piston (3)

7. according to claim 1 or 2 or the catheter flusher of 3 or 6 said preliminary filling liquid, it is characterized in that the inboard length of piston (3) to push pedal (21) is less than or equal to the length of cylindrical shell (1) inner chamber.

8. according to the catheter flusher of the said preliminary filling liquid of claim 1, it is characterized in that said union joint (11) is the locking type outer cone joint of 6: 100 taperings, it is provided with the female thread screw thread.

9. according to the catheter flusher of the said preliminary filling liquid of claim 1, it is characterized in that union joint sheath (12) is the female cone joint of 6: 100 taperings, it is provided with the external screw thread screw thread.

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