Piston injector

Abstract

The utility model provides a piston syringe which comprises a base, a detachably connected liquid medicine inlet and outlet assembly is arranged on the base, an infusion port, a liquid outlet, a liquid medicine channel and an extrusion channel are arranged in the liquid medicine inlet and outlet assembly, and the liquid medicine channel is respectively communicated with the infusion port, the liquid outlet and the extrusion channel. A push rod is arranged in the extrusion channel; a piston rod is connected to the base in a sliding mode, one end of the push rod is detachably connected with the piston rod, and the other end of the push rod is connected into the extrusion channel in a sliding mode; wherein the dismounting and mounting directions of the piston rod and the push rod are consistent with the dismounting and mounting directions of the liquid medicine inlet and outlet assembly and the base, so that cleaning is facilitated, the problem that in the prior art, all parts need to be dismounted, then re-mounted and re-adjusted and metered during cleaning each time is solved, and the stability of the injection amount is improved; and the operation is simpler, more practical and more reasonable.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of medical instruments, and particularly relates to a piston syringe. BACKGROUND

[0002] In actual production, medical instruments are applied more and more widely, and the requirements therefor are more and more strict, and the syringes in the prior art are mostly automatically reset by using the resilience of springs to the piston rod, and the springs are prone to resilience disorder, rusting and abrasion, thereby affecting the service life of the syringe; when quantitative injection is needed, the distance of pushing the piston is adjusted by the scale marked on the side wall of the cavity or the distance of the adjusting sleeve is manually adjusted to determine the injection amount, which not only is prone to error, but also extremely wastes manpower and time; in addition, the syringe in the prior art needs to be completely disassembled for cleaning, the parts are many and the assembly is complex, and the data of metering need to be re-adjusted after each cleaning, so that the use is extremely cumbersome and inconvenient, especially in the case of large-batch injection or precise quantitative injection, the syringe in the prior art cannot meet the needs of people, and therefore, the improvement of the structure of the syringe is particularly important. SUMMARY

[0003] (1) Technical problem to be solved

[0004] The utility model provides a piston syringe, aims at solving the problems of the syringe in the prior art, such as being too complex, inconvenient cleaning and maintenance and cumbersome metering and adjusting.

[0005] (2) Technical scheme

[0006] The utility model provides a piston syringe, including base, be equipped with the medicine liquid access assembly of detachable connection on the base, be equipped with infusion port, liquid outlet, medicine liquid channel and extrusion channel in the medicine liquid access assembly, medicine liquid channel is connected with infusion port, liquid outlet and extrusion channel respectively, be equipped with push rod in the extrusion channel, the piston rod is detachably connected with one end of push rod on the base, the other end of push rod is connected in the extrusion channel, wherein, the dismounting direction of piston rod and push rod is consistent with the dismounting direction of medicine liquid access assembly and base.

[0007] Further, one end of the piston rod is provided with a connecting head, the connecting end of the push rod is provided with a connecting groove with a downward direction or upward and downward communication, the connecting groove is matched with the shape of the connecting head, and the connecting head is upward and downward slidingly connected in the connecting groove.

[0008] Further, the connecting head is a ball head structure.

[0009] Further, the base is internally provided with a cavity, the piston rod is slidably penetrated through the cavity, a sliding block is fixed on the piston rod, and the sliding block is slidably connected in the cavity.

[0010] Further, an adjusting sleeve is sleeved on one end of the piston rod away from the push rod and extending out of the cavity, the adjusting sleeve slides close to or away from the outer wall of the cavity along with the sliding of the piston rod, and the adjusting sleeve is threadedly connected with the piston rod.

[0011] Further, the base is internally provided with an electromagnetic valve, a gas pipe one and a gas pipe two, one end of the gas pipe one and the gas pipe two is respectively communicated with the cavity, and the other end is respectively communicated with the electromagnetic valve.

[0012] Further, a one-way valve one is arranged at the connection between the infusion port and the liquid channel, a one-way valve two is arranged at the connection between the liquid outlet and the liquid channel, and the one-way valve one and the one-way valve two are the same structure and are oppositely arranged.

[0013] Further, the one-way valve one and the one-way valve two are both made of rubber material.

[0014] Further, the liquid inlet and outlet assembly sequentially comprises an upper module, a middle module and a lower module which are detachably connected from top to bottom, the one-way valve one is respectively connected with the middle module and the lower module, and the one-way valve two is respectively connected with the upper module and the middle module.

[0015] Further, the push rod and the liquid inlet and outlet assembly are respectively arranged in four on the base, and the push rod and the liquid inlet and outlet assembly are respectively arranged in one-to-one correspondence.

[0016] Compared with the prior art, the beneficial effects of the utility model lie in that:

[0017] By arranging the detachable and separable push rod and liquid inlet and outlet assembly on the base, after each injection, only the modules of the liquid inlet and outlet assembly need to be moved upward in the vertical direction to be detached and separated, meanwhile, the push rod can also be moved upward and separated relative to the piston rod, which is convenient for cleaning and solves the complicated and tedious process of removing all parts and reassembling in the traditional technology each time for cleaning, and since the piston rod does not contact the liquid and does not need to be removed and cleaned, the problem of re-adjusting the metering each time for cleaning is also avoided, and the stability of the injection amount is improved.

[0018] In addition, the piston rod is slidably pushed by the electromagnetic valve, and the one-way valve is physically fixed, so that the whole operation process does not use the spring, and the problems of insufficient springback force and rust and wear after long-term use of the spring are solved, the structure design is more reasonable and practical, and is more in line with people's needs. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is the whole structure schematic view of the utility model.

[0020] Figure 2 It is the front view of the utility model.

[0021] Figure 3 It is the other embodiment schematic view of the connecting head and the connecting end of the utility model.

[0022] Figure 4 It is the enlarged view of the section view of the utility model Figure 1 .

[0023] Figure 5 It is the enlarged view of the section view of the utility model Figure 2 .

[0024] Figure 6 It is the explosion view of the liquid inlet and outlet assembly of the utility model.

[0025] Figure 7 It is the section view of the bolt position of the utility model.

[0026] Figure 8 It is the middle module structure schematic view of the utility model.

[0027] Figure 9 It is the one-way valve structure schematic view of the utility model.

[0028] Figure 10 It is the one-way valve normal state schematic view of the utility model.

[0029] Figure 11 It is the liquid flow direction outlet process schematic view of the utility model.

[0030] Figure 12 It is the liquid flow into the liquid channel process schematic view of the utility model.

[0031] Reference Signs: 1 - base, 11 - cavity, 12 - electromagnetic valve, 13 - air pipe one, 14 - air pipe two, 2 - liquid inlet and outlet assembly, 21 - infusion port, 22 - outlet, 23 - liquid channel, 24 - extrusion channel, 25 - push rod, 251 - connecting end, 252 - connecting groove, 26 - upper module, 27 - middle module, 28 - lower module, 3 - piston rod, 31 - sliding block, 32 - sealing ring, 33 - piston cover, 34 - check ring, 4 - connecting head, 5 - adjusting sleeve, 6 - one-way valve one, 61 - step one, 62 - valve column one, 63 - round hole channel one, 64 - sealing gasket one, 7 - one-way valve two, 71 - step two, 72 - valve column two, 73 - round hole channel two, 74 - sealing gasket two, 8 - bolt, 81 - protruding block, 9 - avoiding hole, 91 - recess. DETAILED DESCRIPTION

[0032] The technical scheme in the utility model embodiment will be clearly and completely described below with reference to the accompanying drawings in the utility model embodiments.

[0033] As shown in the utility model, a piston syringe comprises a base 1, a detachable liquid inlet and outlet assembly 2 is arranged on the base 1, a liquid inlet 21, a liquid outlet 22, a liquid channel 23 and an extrusion channel 24 are arranged in the liquid inlet and outlet assembly 2, the liquid channel 23 is communicated with the liquid inlet 21, the liquid outlet 22 and the extrusion channel 24 respectively, a push rod 25 is arranged in the extrusion channel 24, a piston rod 3 is slidably connected to the base 1, one end of the push rod 25 is detachably connected with the piston rod 3, and the other end of the push rod 25 is slidably connected in the extrusion channel 24. Figures 1-11 It is to be noted that the push rod 25 is always kept in the extrusion channel 24 and sealingly slides with the extrusion channel 24, so that the liquid in the extrusion channel 24 will not overflow, and the piston rod 3 does not contact with the liquid, so that the piston rod 3 does not need to be disassembled for cleaning, and only the push rod 25 needs to be cleaned, thus the detachable structure of the piston rod 3 and the push rod 25 is arranged, which is convenient for cleaning and installation, and improves the complicated disassembly of the whole piston rod in the traditional technology and the re-adjustment of measurement for each cleaning, so that the precision and stability of injection amount are effectively ensured.

[0034] Specifically, since one end of the push rod 25 is in the extrusion channel 24, the push rod 25 will be separated from the piston rod 3 synchronously with the disassembly of the liquid inlet and outlet assembly 2, thus the disassembly direction of the piston rod 3 and the push rod 25 needs to be consistent with the disassembly direction of the liquid inlet and outlet assembly 2 and the base 1, and the disassembly is performed by moving up and down along the Y-axis direction, that is, only the liquid inlet and outlet assembly 2 and the push rod 25 need to be disassembled for cleaning, and the operation is simple and convenient.

[0035] Further, as shown in the utility model, in the embodiment, a connecting groove 252 downward or upward communicated is arranged on the connecting end 251 of the push rod 25 connected with the piston rod 3, and the push rod 25 moves up and down along the connecting groove 252 to disassemble and assemble with the piston rod 3. Figures 1-2 When the push rod 25 is installed, the connecting groove 252 in the push rod 25 is clamped and sleeved on one end of the piston rod 3, so that the push rod 25 and the piston rod 3 are quickly clamped, which is simple and convenient.

[0036] Furthermore, in this invention, one end of the piston rod 3 is provided with a connector 4, and the connecting groove 252 on the push rod 25 is adapted to the shape of the connector 4. The connector 4 is slidably connected to the connecting groove 252. When the push rod 25 needs to be disassembled, it can be moved upward along the opposite direction of the connecting groove 252 to separate the piston rod 3 from the push rod 25. During assembly, simply move the connecting groove 252 downward toward the connector 4 and engage it. The structure is simple and easy to understand, and the operation is convenient.

[0037] It should be noted that the positions of the connector 4 and the connecting groove 252 in this embodiment can be interchanged, and the operating principle is the same as above. However, it is worth noting that since the disassembly and assembly direction of the push rod 25 after the position is interchanged needs to be consistent with the disassembly and assembly direction of the liquid inlet / outlet component 2 and the base 1, the connecting groove 252 should be set upwards at this time, so that the connector 4 can be moved out from the upper opening for disassembly and assembly when it moves upwards. In order to make the overall structure look clearer and more beautiful, the same openings can also be designed on the upper and lower parts of the groove. The setting of the openings does not affect the use of this utility model.

[0038] like Figure 3 As shown, this utility model also provides other embodiments of the shape and structure of the connector 4, that is, in addition to the ball head design, the connector 4 can also be a triangular prism or cuboid structure, and correspondingly, the other end that is engaged with the triangular prism or cuboid should be a groove structure that is compatible with it.

[0039] Furthermore, such as Figure 4 As shown, the base 1 has a cavity 11, and the piston rod 3 slides through the cavity 11. A sliding block 31 is fixed on the piston rod 3 and slidably connected to the cavity 11. At least one sealing ring 32 is also sleeved on the peripheral wall of the sliding block 31. The sealing ring 32 ensures good sealing between the sliding block 31 and the inner wall of the cavity 11. The A end of the cavity 11 connected to the piston rod 3 is provided with a detachable piston cover 33, which is sleeved on the piston rod 3. The piston cover 33 is provided to allow for the disassembly of the piston rod 3, facilitating inspection, maintenance, or replacement of the piston rod 3 or the sealing ring 32, thereby improving the service life of the piston rod 3. It also limits the sliding block 31, ensuring that the sliding block 31 slides within the cavity 11. A retaining ring 34 is also provided on the side of the piston cover 33 away from the cavity 11 to further secure the piston cover 33 and prevent it from falling off the piston rod 3. The B-end opening connecting the cavity 11 and the piston rod 3 is adapted to the piston rod 3.

[0040] Furthermore, such asFigure 5 As shown, the base 1 is provided with an electromagnetic valve 12, a gas pipe 13 and a gas pipe 14, one end of the gas pipe 13 and the gas pipe 14 respectively communicates with the cavity 11, and the other end respectively communicates with the electromagnetic valve 12. It should be noted that the gas pipe 13 is located near the A end of the cavity 11 connected with the piston rod 3, and the gas pipe 14 is located near the B end of the cavity 11 connected with the piston rod 3. When the electromagnetic valve 12 communicates with the gas pipe 14, gas flows into the cavity 11 from the gas pipe 14, and under the action of the gas, the sliding block 31 slides to the A end of the cavity 11 until it abuts against the piston cover 33. At this time, the gas in the cavity between the sliding block 31 and the A end flows out from the gas pipe 13, and the piston rod 3 moves as a whole to the A end direction; when the electromagnetic valve 12 communicates with the gas pipe 13, gas flows into the cavity 11 from the gas pipe 13, and under the action of the gas, the sliding block 31 slides to the B end of the cavity 11 and abuts against it. At this time, the piston rod 3 moves as a whole to the B end direction. By using the pressure difference of the gas to push the piston rod 3 to move, the situation that the spring may not have enough spring back force or the spring may be rusty and damaged is eliminated, so that the user can use more smoothly and more at ease.

[0041] Further, the end of the piston rod 3 away from the push rod 25 and extending out of the cavity 11 is sleeved with an adjusting sleeve 5, the adjusting sleeve 5 slides close to or away from the outer wall of the cavity 11 following the sliding of the piston rod 3, and the adjusting sleeve 5 is threadedly connected with the piston rod 3. The adjusting sleeve 5 is arranged to adjust the injection amount. When it is needed to adjust the injection amount to be small, the adjusting sleeve 5 is screwed in the direction of the cavity 11, at this time, the space of the sliding block 31 to the A end will become smaller, which means that the moving distance becomes smaller, and the injection amount also becomes smaller accordingly; when it is needed to adjust the injection amount to be large, the adjusting sleeve 5 is screwed away from the cavity 11, which is simple in operation and only needs to be adjusted once to fix the amount, with small error and higher accuracy.

[0042] Further, as shown in the drawings, Figures 6-8As shown, the infusion port 21 and the connection of the liquid outlet 22 and the liquid channel 23 are provided with one-way valve one 6 and one-way valve two 7, respectively. The one-way valve one 6 and the one-way valve two 7 are both made of rubber material, and have the same structure but opposite directions. The infusion port 21 is connected with the liquid bottle, which can continuously supply the medicine and reduce the inconvenience of frequent medicine adding, so as to improve the injection efficiency. The liquid inlet and outlet assembly 2 includes an upper module 26, a middle module 27 and a lower module 28 connected in sequence from top to bottom. The one-way valve one 6 is connected with the middle module 27 and the lower module 28, respectively. The one-way valve two 7 is connected with the upper module 26 and the middle module 27, respectively. The infusion port 21 and the liquid outlet 22 are arranged on two adjacent different sides of the upper module 26, respectively. Since the modules and the base 1 are detachable, the liquid inlet and outlet assembly 2 is further provided with a bolt 8 penetrating through the modules and extending into the base 1 and being in sliding connection with the base 1. The bolt 8 passes through the avoidance hole 9 corresponding to the bolt 8 on both sides of the module and abuts against the inside of the base 1. In order to further reinforce the modules, the bolt 8 is further provided with a lug 81 on both sides of the bottom end. The base 1 is provided with an annular groove 91 corresponding to the lug 81. When the bolt 8 is inserted into the base 1, the lug 81 can be fixed with the groove 91 by rotating the bolt 8 within 0-180 degrees, so as to fix the modules and prevent the modules from moving. When it is necessary to disassemble and clean, the bolt 8 can be rotated and reset, and then pulled out upward, so that the modules can be disassembled by moving upward along the Y-axis direction. The disassembling method is more simple and practical.

[0043] Preferably, as Figures 9-12As shown, the one-way valve one 6 further comprises a ring structure step one 61 and a valve column one 62, the one-way valve two 7 further comprises a ring structure step two 71 and a valve column two 72, one end of the valve column one 62 and the valve column two 72 are located in the medicine liquid channel 23 in the middle module 27, and the other end is fixedly connected with the lower module 28 and the upper module 26 respectively, because the one-way valve one 6 and the one-way valve two 7 are both rubber materials, the step one 61 and the step two 71 can be deformed in a small amplitude under the action of the medicine liquid flow in the medicine liquid channel 23, and the deformation can make the blocked medicine liquid channel 23 reconnected to inject the medicine liquid, which is different from the traditional spring supporting and elastic pressure, the utility model adopts the physical fixed physical deformation mode, the one-way valve one 6 and the one-way valve two 7 can realize the function of one-way flow without the help of spring elastic pressure. In addition, the middle module 27 is also provided with a circular hole channel one 63 and a circular hole channel two 73 which are arranged in a ring array around the central axis of the one-way valve one 6 and the one-way valve two 7 respectively, the infusion port 21 is communicated with the medicine liquid channel 23 through the circular hole channel one 63, and the liquid outlet 22 is communicated with the medicine liquid channel 23 through the circular hole channel two 73;

[0044] The step one 61 and the step two 71 are matched with the circular hole channel one 63 and the circular hole channel two 73 respectively, in order to prevent the medicine liquid from leaking between the upper module 26 and the middle module 27 or the middle module 27 and the lower module 28, the "8" shaped sealing gasket one 64 is arranged on the upper end face of the circular hole channel one 63 and the circular hole channel two 73, and the oval sealing gasket two 74 is arranged on the lower end face of the circular hole channel one 63 and the circular hole channel two 73, so that the sealing effect of the medicine liquid flow is further enhanced. In the non-use state, the step one 61 and the step two 71 abut with the circular hole channel one 63 and the circular hole channel two 73 respectively and play the role of closing the circular hole channel, in the use state, the push rod 25 is retracted to generate negative pressure in the medicine liquid channel 24, the medicine liquid enters the medicine liquid channel 23 through the infusion port 21 and flows through the circular hole channel one 63 to the step one 61 of the one-way valve one 6, at this time, the whole edge of the step one 61 floats down due to the influence of negative pressure, so that the circular hole channel one 63 is communicated with the medicine liquid channel 23, because the directions of the one-way valve one 6 and the one-way valve two 7 are opposite, the medicine liquid will not be discharged from the liquid outlet 22;

[0045] When the injection is performed, the push rod 25 moves towards the extrusion channel 24, at this time, the medicine liquid is pushed to flow upwards, when flowing through the one-way valve 6, the step 61 is automatically reset and the round hole channel 63 communicated with the infusion port 21 is closed due to the pressure difference, thus the medicine liquid can only flow from the liquid outlet 22 end to the step 71, the whole edge of the step 71 floats upwards and forms an opening, so that the medicine liquid flows out of the liquid outlet 22 through the opening, thereby the injection process is completed.

[0046] Meanwhile, the round hole channel 63 and the round hole channel 73 are simultaneously sealed by using the sealing gasket 64, so that the material is saved and the sealing stability is improved.

[0047] Further, four push rods 25 and the medicine liquid inlet and outlet assembly 2 are arranged on the base 1 respectively in the embodiment, the push rod 25 and the medicine liquid inlet and outlet assembly 2 are arranged one by one respectively, in actual application, the number of the push rod 25 and the medicine liquid inlet and outlet assembly 2 can be increased or reduced according to the user's needs, so that the injection efficiency is adjusted, and the use effect of the utility model is not affected.

[0048] The utility model discloses an innovation point lies in setting up detachable push rod and medicine liquid inlet and outlet assembly on the base, after each injection, only needs the each module of medicine liquid inlet and outlet assembly to move upwards along the vertical direction and can be detached, simultaneously, the push rod can also move upwards and separate relative to the piston rod, is convenient for cleaning and also solves the complicated and complex place of traditional technology in each cleaning and needs to remove and reassemble the part, and since the piston rod does not contact the medicine liquid and needs not to remove and clean, therefore also avoids the problem of needing to re-adjust the metering every time cleaning, improves the stability of injection quantity.

[0049] In addition, the piston rod is pushed to slide through the electromagnetic valve and the one-way valve is fixed through physics, the whole operation process does not use the spring, solves the insufficient rebound and rust abrasion of the spring after long time use, and the structure design is more reasonable and practical, and is more in line with people's needs.

[0050] In addition, it should be understood that, although the present specification is described according to the embodiments, not every embodiment contains only one independent technical scheme, the description manner of the specification is only for the sake of clarity, the skilled in the art should regard the specification as a whole, and the technical scheme in each embodiment can also be combined appropriately to form other embodiments that can be understood by the skilled in the art.

[0051] It is apparent for a person skilled in the art that the present application is not restricted to the details of the above exemplary embodiments, but that it can be implemented in other concrete forms without departing from the spirit or the essential characteristics of the present application. Therefore, the embodiments should be considered as exemplary only, and not limiting, the scope of the present application being defined by the appended claims rather than the above description, and all changes coming within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference signs in the claims should not be construed as limiting the claims concerned.

Claims

1. A piston syringe characterized by, The base (1) is provided with a detachable liquid inlet and outlet assembly (2), the liquid inlet and outlet assembly (2) is provided with a liquid inlet port (21), a liquid outlet port (22), a liquid channel (23) and a pressing channel (24), the liquid channel (23) is communicated with the liquid inlet port (21), the liquid outlet port (22) and the pressing channel (24) respectively, the pressing channel (24) is provided with a push rod (25), the base (1) is slidably connected with a piston rod (3), one end of the push rod (25) is detachably connected with the piston rod (3), the other end of the push rod (25) is slidably connected in the pressing channel (24). The dismounting direction of the piston rod (3) and the push rod (25) is consistent with the dismounting direction of the liquid inlet and outlet assembly (2) and the base (1).

2. A syringe according to claim 1, wherein One end of the piston rod (3) is provided with a connecting head (4), the connecting end (251) of the push rod (25) is provided with a connecting groove (252) with downward or upward communication, the connecting groove (252) is matched with the shape of the connecting head (4), the connecting head (4) is slidably connected in the connecting groove (252).

3. A syringe according to claim 2, wherein The connecting head (4) is a ball head structure.

4. The syringe of claim 1, wherein The base (1) is provided with a cavity (11), the piston rod (3) is slidably penetrated through the cavity (11), the piston rod (3) is fixedly provided with a sliding block (31), the sliding block (31) is slidably connected in the cavity (11).

5. A syringe according to claim 4, wherein The end of the piston rod (3) away from the push rod (25) and extending out of the cavity (11) is provided with an adjusting sleeve (5), the adjusting sleeve (5) is slidably close to or away from the outer wall of the cavity (11) following the sliding of the piston rod (3), the adjusting sleeve (5) is threadedly connected with the piston rod (3).

6. A syringe according to claim 5, wherein The base (1) is provided with a solenoid valve (12), a gas pipe one (13) and a gas pipe two (14), one end of the gas pipe one (13) and the gas pipe two (14) is communicated with the cavity (11) respectively, the other end is communicated with the solenoid valve (12) respectively.

7. The syringe of claim 1, wherein The connecting part of the liquid inlet port (21) and the liquid channel (23) is provided with a one-way valve one (6), the connecting part of the liquid outlet port (22) and the liquid channel (23) is provided with a one-way valve two (7), the one-way valve one (6) and the one-way valve two (7) are the same structure and opposite setting direction.

8. A syringe according to claim 7, wherein The one-way valve one (6) and the one-way valve two (7) are both rubber materials.

9. A syringe according to claim 7, wherein The liquid inlet and outlet assembly (2) comprises an upper module (26), a middle module (27) and a lower module (28) from top to bottom, the one-way valve one (6) is connected with the middle module (27) and the lower module (28) respectively, the one-way valve two (7) is connected with the upper module (26) and the middle module (27) respectively.

10. The syringe of claim 1, wherein, The base (1) is provided with four push rods (25) and liquid inlet and outlet assemblies (2) respectively, the push rod (25) and the liquid inlet and outlet assembly (2) are set one by one respectively.

Images