CN2860497Y - Pre-filled injector for mixed drug injection with flexible pole - Google Patents

Abstract

A pre-filling syringe mixing the medicines of the injection with an easy-breaking rod includes a syringe barrel and the a piston rod, wherein the bottom of the syringe barrel has a connection head which is connected with the easy-breaking rod, while the easy-breaking rod seals the liquid outlet; the top of the syringe barrel has an opening, while the barrel wall has an outer convex channel; and the syringe barrel is provided with the upper and lower pistons which connect with the syringe barrel closely, the upper piston is arranged on the opening of the syringe barrel, while the lower piston is on the outer convex channel, such two pistons separate the syringe barrel to close upper and lower cavities; the top of the syringe barrel has an end cover, while the lower end of the piston rod is connected to the screw of the end cover through the bolt of the lower part and the piston rod just closes to the upper piston, and the smooth rod of upper end extends to the outside of the opening of the syringe barrel. Rotating the piston rod to the direction of the syringe barrel through the end cover, making the lower piston back to the middle of the outer convex channel and connect to the upper, lower cavities. The utility model can store the medicine of the injection and the dilution solution in the same syringe, thus to complete the dispense and the injection at one time, as well as easy to operate, avoid the pollution during the dispensing procedure, simple seal structure of the easy-breaking rod, tight seal and the low cost.

Description

The pre-charge injector of the mixing injection medicines of band easy broken rod

Technical field

This utility model belongs to the medical packaging field, is specifically related to a kind of pre-charge injector.

Background technology

At present, the syringe that each medical institutions generally uses is the syringe of injecting immediately behind the pumping liquid, and some pre-charge injectors by pharmaceutical factory's prepackage medicinal liquid are also arranged.Pre-charge injector on the market is a single chamber, and only adorns a kind of syringe of liquid medicine, is generally used for being worth higher medicine.Because physics, the chemical characteristic difference of medicine with the drying regime package storage, could prolong the shelf life as a lot of medicines.Therefore in hospital's injection process, must extract the required dilute solution of this class medicine with syringe earlier, inject the container that the drying regime medicine is housed, the mixed liquid medicine injection that shakes up into, the same syringe of reuse extracts this medicinal liquid and injects in the human body.Some special injections, after must be earlier medicine and another kind of medicinal liquid being mixed, the neutralization of reuse dilute solution, therefore in injection process, must extract a kind of medicinal liquid with syringe earlier, inject the container that another kind of medicine such as a kind of drying regime medicine are housed, mixed shaking up, the dilute solution that reinjects is blended into injection, and the same syringe of reuse extracts this injection and injects in the human body.

The using method of above-mentioned syringe at present commonly used, complicated operation is loaded down with trivial details on the one hand, is easy to generate pollution in the preparation injection process; Medicine and dilute solution are packed with different vessels respectively on the other hand, produce, use cost is higher.

The utility model content

Technical problem to be solved in the utility model is the defective that overcomes above-mentioned prior art, provide a kind of can be simultaneously with one to two kind of injection medicine (dry shape medicine or liquid medicine, or dry shape medicine and liquid medicine) and dilute solution be stored in the same syringe, be divided into before the use in each confined chamber, can mix easily during use, realization is made up a prescription and is injected disposable finishing, easy and simple to handle, can avoid preparing the pollution that produces in the injection process, use cost is low, and hermetically-sealed construction is simple, seals tightly, more meets the pre-charge injector of mixing injection medicines of the band easy broken rod of pharmaceutical production requirement.

For solving the problems of the technologies described above, this utility model adopts following technical proposals.

The pre-charge injector of the mixing injection medicines of this utility model band easy broken rod, comprise injection tube and piston rod, the bottom that it is characterized in that described injection tube is provided with the union joint that is used to connect entry needle, the center of union joint is provided with the liquid outlet that communicates with the injection tube inner chamber, union joint links to each other with an easy broken rod that is fractureed easily, easy broken rod seals liquid outlet, the top of injection tube is an opening, the barrel of described injection tube is provided with the evagination passage, be provided with in the injection tube and bonded upper piston of injection tube tube inner wall sealing and lower piston, upper piston places the opening part of injection tube, lower piston places the below of upper piston and is positioned on the evagination passage, on, lower piston will be separated out airtight upper chamber and lower chamber in the injection tube, the length of lower piston is less than the length of evagination passage; The injection tube top is arranged with an end cover, the endoporus of this end cover is made up of aperture bigger bottom hole and aperture small upper screw, the end cover combines with the injection tube top by bottom hole, the bottom of described piston rod is a screw rod, top is less than or equal to the polished rod of screw flight path for its diameter, the lower end of piston rod is connected by the top screw of screw rod with the end cover, and is close to upper piston, and the upper end of piston rod extends to outside the injection tube opening.

As further improvement of the utility model, also be provided with the second evagination passage on the barrel of described injection tube, also be provided with in the injection tube and the bonded intermediate piston of injection tube tube inner wall sealing, described intermediate piston places between upper piston and the lower piston, described airtight upper chamber is divided into upper chamber A and intermediate cavity, this second evagination passage is between intermediate piston and lower piston, and the length of described intermediate piston is less than the length of the second evagination passage.

Further improve as of the present utility model, can be provided with external screw thread on the drum outer wall at described injection tube top, the bottom hole of described end cover is made as screw, and end cover and injection tube are by being threaded.Also can be provided with the outer rim boss on the drum outer wall at described injection tube top, be provided with groove with outer rim boss corresponding position in the bottom hole of described end cover, described end cover is connected by the outer rim boss pressing that is pressed in the groove with injection tube.

Described easy broken rod and union joint, injection tube injection mo(u)lding are one.

Described evagination passage or be one, or be symmetrically distributed two or three along circumference, the second evagination passage or be, or be symmetrically distributed two or three along circumference.

The upper end of described piston rod is provided with handle.

Described piston rod adopts medical plastic to make, and the upper, middle and lower piston adopts medical grade rubber to make.

The beneficial effects of the utility model are: the pre-charge injector of the mixing injection medicines of this utility model band easy broken rod adopts the injection tube of the cylindrical shell with evagination passage, and in injection tube, be provided with barrel dliameter supporting on, lower piston or on, in, lower piston, in the syringe cylinder inner chamber, be separated out airtight on, following two chambers or on, in, following three chambers, storage at as prepackage injection medicine and dilute solution, can be simultaneously with injection medicine (dry shape medicine or liquid medicine, or dry shape medicine and liquid medicine) and dilute solution be stored in two or three airtight chambers of same syringe, use the above two or three to separate fully, can mix easily during use, realization is made up a prescription and is injected disposable finishing, easy and simple to handle, avoided preparing the pollution that produces in the injection process, and simple in structure, the production use cost is low.The liquid outlet of injection tube is by the easy broken rod sealing that is fractureed easily, compare with the sealing means of alternate manner, production cost is low, can with the injection tube one-shot forming, avoided the required anabolic process of other structure, reduce the contaminated probability of product greatly, simple in structure, seal tightly, more meet the pharmaceutical production requirement, can easily it be fractureed during injection, easy to use.

Description of drawings

Fig. 1 is the structural representation cutaway view of this utility model embodiment 1;

Fig. 2 is the cutaway view of injection tube among the embodiment 1;

Fig. 3 is the A-A profile of Fig. 2;

Fig. 4 is the cutaway view of lower piston;

Fig. 5 is the cutaway view of embodiment 1 middle-end cover;

Fig. 6 is the structural representation of piston rod;

Fig. 7 is the structural representation cutaway view of this utility model embodiment 2;

Fig. 8 is the cutaway view of injection tube among the embodiment 2;

Fig. 9 is the cutaway view of embodiment 2 middle-ends cover;

Figure 10 is the structural representation cutaway view of embodiment 3;

Figure 11 is the cutaway view of injection tube among the embodiment 3;

Figure 12 is the A-A profile of Figure 11;

Figure 13 is the cutaway view of intermediate piston.

Figure 14 is injection tube another section of structure in evagination passage, the second evagination passage place.

Figure 15 is the another section of structure of injection tube in evagination passage, the second evagination passage place.

Each label is represented among the figure:

1, injection tube 11, easy broken rod

12, liquid outlet 13, union joint

14, evagination passage 15, external screw thread

16, outer rim boss 17, the second evagination passage

2, lower piston 3, end cover

31, bottom hole 311, groove

32, top screw 4, piston rod

41, screw rod 42, handle

43, polished rod 5, lower chamber

6, upper chamber 61, upper chamber A

7, upper piston 8, dilute solution

9, injection medicine 91, injection medicine A

92, injection medicine B 10, intermediate piston

18, intermediate cavity

The specific embodiment

Fig. 1～5 show embodiment 1 of the present utility model, shown in above-mentioned each figure, the pre-charge injector of the mixing injection medicines of this utility model band easy broken rod, comprise injection tube 1 and piston rod 4, the bottom of injection tube 1 is provided with the taper connection 13 that is used to connect entry needle, the center of union joint 13 is provided with the liquid outlet 12 that communicates with injection tube 1 inner chamber, union joint 13 links to each other with an easy broken rod that is fractureed easily 11, easy broken rod 11 is with liquid outlet 12 sealings, make it be in closed state, easy broken rod 11 is the place that fractures of easy broken rod 11 with union joint 13 joints.Easy broken rod 11 can with injection tube 1,13 injection mouldings of union joint in one, in the joint of easy broken rod 11 and union joint 13 district easy to break that easy broken rod 11 can be fractureed is set, can easily easy broken rod 11 be fractureed during use.The top of injection tube 1 is an opening, the barrel of injection tube 1 is provided with the evagination passage 14 of certain-length, be provided with in the injection tube 1 and bonded upper piston 7 of 1 inner wall sealing of injection tube and lower piston 2, upper piston 7 places the opening part of injection tube 1, lower piston 2 places the below of upper piston 7 and just places evagination passage 14 tops, evagination passage 14 can be arranged at the middle part of injection tube 1, upper and lower piston 7,2 will be separated out airtight upper chamber 6 and lower chamber 5 in the injection tube 1, the length h1 of lower piston 2 is less than the length H1 of evagination passage 14; Lower chamber 5 and upper chamber 6 are poured into injection medicine 9 (dry shape medicine or liquid medicine) as the storage at of prepackage injection medicine 9 with dilute solution 8 in the lower chamber 5, perfusion dilute solution 8 in the upper chamber 6.Injection tube 1 top is arranged with end cover 3, the endoporus of this end cover 3 is made up of aperture bigger bottom hole 31 and aperture small upper screw 32, end cover 3 combines with injection tube 1 top by bottom hole 31, in the present embodiment, the drum outer wall at injection tube 1 top is provided with external screw thread 15, the bottom hole 31 of end cover 3 be a screw, and end overlaps 3 fixedlys connected by screw thread with injection tube 1.The bottom of piston rod 4 is a screw rod 41, top is the polished rod 43 (referring to Fig. 6) of its diameter less than the screw thread path of screw rod 41, the lower end of piston rod 4 is connected by the top screw 32 of screw rod 41 with end cover 3, and be close to upper piston 7, the upper end of piston rod 4 extends to outside injection tube 1 opening, for operation usefulness, and the end is provided with handle 42 thereon, is convenient to injection operation.Piston rod 4 adopts medical plastic to make, and upper and lower piston 7,2 adopts medical grade rubber to make.

The process of this utility model pre-filling injection agent medicine 9 and dilute solution 8 is: at first injection medicine 9 (dry shape medicine or liquid medicine) is poured in the injection tube 1, can be pressed in the tube with the bonded lower piston 2 of 1 inner wall sealing of injection tube, and just be positioned at the top of evagination passage 14, form the airtight lower chamber 5 that has poured into injection medicine 9, aerofluxus in the time of tamponade makes lower chamber 5 be in normal pressure and sealing; Dilute solution 8 is poured in the space on the top of lower piston 2 in the injection tube 1, upper piston 7 is pressed in the injection tube 1, form the airtight upper chamber 6 that has poured into dilute solution 8, aerofluxus in the time of tamponade makes upper chamber 6 be in normal pressure and sealing; Injection tube 1 and end cover 3 are fixedlyed connected with threaded bottom hole 31 by external screw thread 15, in the top screw 32 with the screw rod 41 end screw terminals of piston rod 4 cover 3, and contact upper piston 7, so just finished the prepackage injection medicine 9 of the mixing injection medicines pre-charge injector of being with easy broken rod and the process of dilute solution 8.During use, with the top screw 32 of piston rod 4 by screw rod 41 and end cover 3, screw in toward injection tube 1 direction, compressing upper piston 7, dilute solution 8 and lower piston 2, move down together,, can make lower piston 2 retreat to the centre of the evagination passage 14 on the injection tube 1 exactly by screw, lower chamber 5 and upper chamber 6 are interconnected by evagination passage 14, and the dilute solution 8 in the upper chamber 6 is mixed into injection with the injection medicine 9 in the lower chamber 5.This utility model is erected, make easy broken rod 11 be in the below, injection concentrates on the bottom of injection tube 1, has finished the process of making up a prescription like this.Again piston rod 4 is continued to screw in, screw rod 41 breaks away from top screw 32, and polished rod 43 enters in the top screw 32; Easy broken rod 11 is fractureed, entry needle is contained in taper connection 13 place, just can carry out injection operation.

Fig. 7～9 show embodiment 2 of the present utility model, as different from Example 1: end cover 3 is not by being threaded with injection tube 1, but as shown in the figure, the drum outer wall at injection tube 1 top is provided with outer rim boss 16, be provided with groove 311 with outer rim boss 16 corresponding positions in the bottom hole 31 of end cover 3, end cover 3 is connected by outer rim boss 16 pressing and fixing that are pressed in the groove 311 with injection tube 1.

Figure 10～13 show embodiment 3 of the present utility model, as different from Example 1: on the barrel of injection tube 1 except that being provided with evagination passage 14, also be provided with the second evagination passage 17, in injection tube 1 except that being provided with upper piston 7 and lower piston 2, also be provided with and the bonded intermediate piston 10 of 1 inner wall sealing of injection tube, intermediate piston 10 places between upper piston 7 and the lower piston 2, upper piston 7, intermediate piston 10 and lower piston 2 are separated out upper chamber A61 in injection tube 1, intermediate cavity 18 and lower chamber 5, perfusion injection medicine A91 (can be dry shape medicine or liquid medicine) in the lower chamber 5, perfusion injection medicine B92 (can be liquid medicine) in the intermediate cavity 18, perfusion dilute solution 8 in the upper chamber A61.Evagination passage 14 can be arranged at the middle and lower part of injection tube 1, lower piston 2 just places evagination passage 14 tops, the second evagination passage 17 can place the middle part of injection tube 1, and between intermediate piston 10 and lower piston 2, the length h2 of intermediate piston 10 is less than the length H2 of the second evagination passage 17.The drum outer wall at injection tube 1 top is provided with outer rim boss 16, is provided with groove 311 with outer rim boss 16 corresponding positions in the bottom hole 31 of end cover 3, and end cover 3 is connected by outer rim boss 16 pressing and fixing that are pressed in the groove 311 with injection tube 1.Also can be as described in example 1 above, end cover 3 and injection tube 1 are fixedlyed connected by screw thread.

The process of present embodiment pre-filling injection agent medicine A91, injection medicine B92 and dilute solution 8 is: at first injection medicine A91 is poured into injection tube 1 bottom, can be pressed in the tube with the bonded lower piston 2 of 1 inner wall sealing of injection tube, and just be positioned at the top of evagination passage 14, form the airtight lower chamber 5 that has poured into injection medicine A91, aerofluxus in the time of tamponade makes lower chamber 5 be in normal pressure and sealing.Injection medicine B92 is poured in the space on the top of lower piston 2 in the injection tube 1, intermediate piston 10 is pressed in the tube, and be positioned at the top of the second evagination passage 17, form the airtight intermediate cavity 18 that has poured into injection medicine B92, aerofluxus in the time of tamponade makes intermediate cavity 18 be in normal pressure and sealing.Dilute solution 8 is poured in the space on intermediate piston 10 tops in the injection tube 1, upper piston 7 is pressed in the injection tube 1, form the airtight upper chamber A61 that has poured into dilute solution 8, aerofluxus in the time of tamponade makes upper chamber A61 be in normal pressure and sealing.Injection tube 1 and end cover 3 are connected by outer rim boss 16 pressing and fixing, in the top screw 32 with the screw rod 41 end screw terminals of piston rod 4 cover 3, and contact upper piston 7, so just finished prepackage injection medicine A91, the injection medicine B92 of the mixing injection medicines pre-charge injector of being with easy broken rod and the process of dilute solution 8.During use, with the top screw 32 of piston rod 4 by screw rod 41 and end cover 3, screw in toward injection tube 1 direction, compressing upper piston 7, dilute solution 8, intermediate piston 10, injection medicine B92 and lower piston 2, move down together, by screw, can make lower piston 2 retreat to the centre of the evagination passage 14 on the injection tube 1 exactly, lower chamber 5 and intermediate cavity 18 are interconnected by evagination passage 14, and the injection medicine B92 in the intermediate cavity 18 mixes with injection medicine A91 in the lower chamber 5; Piston rod 4 is continued to screw in toward injection tube 1 direction, make intermediate piston 10 retreat to the centre of the second evagination passage 17 on the injection tube 1, upper chamber A61 and intermediate cavity 18 are interconnected by the second evagination passage 17, make the dilute solution 8 among the upper chamber A61 be mixed into injection with blended injection medicine; This utility model is erected, make easy broken rod 11 be in the below, injection concentrates on the bottom of injection tube 1, has finished the process of making up a prescription like this.Again piston rod 4 is continued to screw in, upper piston 7 is under the effect of piston rod 4, down motion, contact with intermediate piston 10, both down move together then, and contact with lower piston 2, and the three is down motion together, cross evagination passage 14 until lower piston 2, injection is got lodged in the lower chamber 5 fully.Screw rod 41 breaks away from top screws 32 at this moment, and polished rod 43 enters in the top screw 32; Easy broken rod 11 is fractureed, entry needle is contained in taper connection 13 place, just can carry out injection operation.

Shown in Figure 14,15, evagination passage 14, the second evagination passage 17 can be one in the various embodiments described above, also can be uniformly distributed along the circumference two or three.

Claims (10)

1, a kind of pre-charge injector of the mixing injection medicines with easy broken rod, comprise injection tube (1) and piston rod (4), the bottom that it is characterized in that described injection tube (1) is provided with the union joint (13) that is used to connect entry needle, the center of union joint (13) is provided with the liquid outlet (12) that communicates with injection tube (1) inner chamber, union joint (13) links to each other with an easy broken rod that is fractureed easily (11), easy broken rod (11) seals liquid outlet (12), the top of injection tube (1) is an opening, the barrel of described injection tube (1) is provided with evagination passage (14), be provided with in the injection tube (1) and injection tube (1) tube bonded upper piston of inner wall sealing (7) and lower piston (2), upper piston (7) places the opening part of injection tube (1), lower piston (2) places the below of upper piston (7) and is positioned on the evagination passage (14), on, lower piston (7,2) with injection tube (1)) in be separated out airtight upper chamber (6) and lower chamber (5), the length (h1) of lower piston (2) is less than the length (H1) of evagination passage (14); Injection tube (1) top is arranged with an end cover (3), the endoporus of this end cover (3) is made up of bigger bottom hole in aperture (31) and aperture small upper screw (32), end cover (3) combines with injection tube (1) top by bottom hole (31), the bottom of described piston rod (4) is screw rod (41), top is less than or equal to the polished rod (43) of the screw thread path of screw rod (41) for its diameter, the lower end of piston rod (4) is connected by the top screw (32) of screw rod (41) with end cover (3), and being close to upper piston (7), the upper end of piston rod (4) extends to outside injection tube (1) opening.

2, the pre-charge injector of the mixing injection medicines of band easy broken rod according to claim 1, it is characterized in that also being provided with the second evagination passage (17) on the barrel of described injection tube (1), also be provided with in the injection tube (1) and injection tube (1) the tube bonded intermediate piston of inner wall sealing (10), described intermediate piston (10) places between upper piston (7) and the lower piston (2), airtight upper chamber (6) is divided into upper chamber A (61) and intermediate cavity (18), this second evagination passage (17) is positioned between intermediate piston (10) and the lower piston (2), and the length (h2) of described intermediate piston (10) is less than the length (H2) of the second evagination passage (17).

3, the pre-charge injector of the mixing injection medicines of band easy broken rod according to claim 1 and 2, the drum outer wall that it is characterized in that described injection tube (1) top is provided with external screw thread (15), the bottom hole (31) of described end cover (3) is a screw, and end cover (3) and injection tube (1) are by being threaded.

4, the pre-charge injector of the mixing injection medicines of band easy broken rod according to claim 3 is characterized in that described easy broken rod (11) and union joint (13), injection tube (1) injection mo(u)lding are one.

5, the pre-charge injector of the mixing injection medicines of band easy broken rod according to claim 4, it is characterized in that described evagination passage (14) or be one, or be uniformly distributed along the circumference two or three, the second evagination passage (17) or be, or be uniformly distributed along the circumference two or three.

6, the pre-charge injector of the mixing injection medicines of band easy broken rod according to claim 1 and 2, the drum outer wall that it is characterized in that described injection tube (1) top is provided with outer rim boss (16), be provided with groove (311) with outer rim boss (16) corresponding position in the bottom hole (31) of described end cover (3), described end cover (3) is connected by outer rim boss (16) pressing that is pressed in the groove (311) with injection tube (1).

7, the pre-charge injector of the mixing injection medicines of band easy broken rod according to claim 6 is characterized in that described easy broken rod (11) and union joint (13), injection tube (1) injection mo(u)lding are one.

8, the pre-charge injector of the mixing injection medicines of band easy broken rod according to claim 7, it is characterized in that described evagination passage (14) or be one, or be uniformly distributed along the circumference two or three, the second evagination passage (17) or be, or be uniformly distributed along the circumference two or three.

9, the pre-charge injector of the mixing injection medicines of band easy broken rod according to claim 1 and 2 is characterized in that the upper end of described piston rod (4) is provided with handle (42).

10, the pre-charge injector of the mixing injection medicines of band easy broken rod according to claim 1 and 2 is characterized in that described piston rod (4) adopts medical plastic to make, and upper, middle and lower piston (7,10,2) adopts medical grade rubber to make.

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