Premixing injection device for anorectal contrast agent

Abstract

The utility model relates to an anorectal contrast instrument, in particular to an anorectal contrast agent premixing injection device, which comprises an injection tube, a piston arranged at the rear end of the injection tube and a push rod connected with the piston, a premixing cavity is arranged at the front end of the injection tube, a movable plug is arranged at the front end of the premixing cavity, and a channel is arranged on the movable plug. After the contrast agent is mixed in the premixing cavity, the push rod is pulled backwards to drive the piston to move, so that the contrast agent flows backwards along the inner cavity of the syringe, then the movable plug is pushed backwards to cross the premixing cavity, and then the push rod is pushed forwards to drive the piston to move, so that the contrast agent is injected through the channel. The premixing cavity capable of mixing the contrast agent is arranged at the front end of the syringe, and after the contrast agent is mixed in the premixing cavity, the piston is driven by the push rod to move to push the contrast agent into the channel of the movable plug for injection, so that mixing and injection of the contrast agent are integrated, the workload of medical staff is reduced, and the working efficiency is improved. And the leakage of the contrast agent is avoided.

Description

Technical Field

[0001] The utility model relates to anorectal radiography equipment, in particular to an anorectal radiography premix injection device. Background Art

[0002] In clinical work, barium contrast agents are often used for anorectal contrast examinations, such as using barium enema to diagnose colon lesions. Specifically, the barium is injected into the intestine through the anal canal using a syringe, and then an X-ray examination is performed for diagnosis. This method has obvious effects on the detection of colon function, tumors, polyps, inflammation, tuberculosis and ulcers in the intestine. At present, the enema device used on the market is composed of a separate contrast agent mixing container and a syringe. Generally, medical staff put an appropriate amount of barium and other contrast agents in a mixing container, then add an appropriate amount of water and stir evenly to form a mixed liquid, and then pour the contrast agent in the mixing container into the syringe, and finally inject it into the patient using the syringe and anal canal. In this process, the contrast agent is mixed in a separate container and then poured into the syringe, which not only easily causes leakage of the contrast agent, but also makes it troublesome, time-consuming and laborious for medical staff to operate. Utility Model Content

[0003] In view of the above technical problems, the utility model provides an anorectal contrast agent premix injection device integrating mixing and injection.

[0004] The technical solution adopted by the utility model to solve the above-mentioned technical problems is: a premix injection device for anorectal contrast agent, comprising a syringe, a piston arranged at the rear end of the syringe and a push rod connected to the piston, pushing and pulling the push rod can drive the piston to move axially along the inner cavity of the syringe, and a premixing chamber is provided at the front end of the syringe, and a movable plug is provided at the front end of the premixing chamber, and a channel is provided on the movable plug; after the contrast agent is mixed in the premixing chamber, the push rod is pulled backward to drive the piston to move so that the contrast agent flows backward along the inner cavity of the syringe, and then the movable plug is pushed backward to make it pass over the premixing chamber, and then the push rod is pushed forward to drive the piston to move so that the contrast agent is injected through the channel.

[0005] Preferably, an annular cavity is formed in the cavity wall of the premixing cavity, and a plurality of air holes connected to the premixing cavity are opened on the annular cavity wall. An external gas source transports gas to the plurality of air holes through the annular cavity, and the gas ejected from the plurality of air holes mixes the contrast agent in the premixing cavity.

[0006] Preferably, the external gas source is a gas delivery ball, and the gas can be delivered to the annular cavity through a gas delivery pipe by squeezing the gas delivery ball.

[0007] Preferably, an air inlet seat is provided on the front side of the annular cavity, one end of the air delivery pipe is plugged into the air inlet seat, and the other end is connected to the air delivery ball.

[0008] Preferably, a retaining ring is provided on the rear side of the premixing chamber to prevent the piston from moving.

[0009] Preferably, one end of the channel is communicated with the inner cavity of the syringe, and the other end of the channel is sealed by a detachable movable cover.

[0010] Preferably, the movable plug is connected to the inner cavity of the injection barrel by threads.

[0011] Preferably, a plurality of sealing rings are provided on the peripheral wall of the movable plug.

[0012] Preferably, after the movable cover is opened, the passage is connected to an anal canal.

[0013] Preferably, a sealing cover is provided at the end of the rear end of the injection barrel.

[0014] It can be seen from the above technical scheme that the utility model is provided with a premixing chamber for mixing contrast agent at the front end of the syringe. After the contrast agent is mixed in the premixing chamber, the push rod is used to drive the piston to move the contrast agent into the channel of the movable plug for injection, thereby integrating the mixing and injection of the contrast agent, which not only reduces the workload of medical staff, but also avoids the leakage of the contrast agent. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional structural schematic diagram of the utility model.

[0016] Figure 2 It is a schematic diagram of the cross-sectional structure of the utility model. DETAILED DESCRIPTION

[0017] The present invention will be described in detail below in conjunction with the accompanying drawings. The illustrative embodiments and descriptions of the present invention are used to explain the present invention but are not intended to limit the present invention.

[0018] like Figure 1 , Figure 2The utility model provides an anorectal contrast agent premix injection device, which includes a syringe 1, a piston 2 arranged at the rear end of the syringe and a push rod 3 connected to the piston, and a handle 31 is provided at the end of the push rod for easy pushing and pulling. By pushing and pulling the push rod with the handle, the piston can be driven to move axially along the inner cavity of the syringe, so that the contrast agent in the syringe is injected into the intestine to achieve contrast; a premixing chamber 4 is provided at the front end of the syringe, and a movable plug 5 is provided at the front end of the premixing chamber, and a channel 51 is provided on the movable plug; after the contrast agent is mixed in the premixing chamber, the push rod is pulled backward to drive the piston to move so that the contrast agent flows backward along the inner cavity of the syringe, and then the movable plug is pushed backward to make it pass over the premixing chamber, and then the push rod is pushed forward to drive the piston to move so that the contrast agent is injected through the channel. It can be seen that the utility model integrates the mixing and injection of contrast agent, and medical staff do not need to mix and stir separately before pouring the fluid contrast agent into the syringe. The operation is simpler, saves time and effort, and is not prone to leakage of the fluid contrast agent.

[0019] Specifically, an annular cavity 41 is formed in the cavity wall of the premixing cavity 4, and a plurality of air holes 42 connected to the premixing cavity are provided on the annular cavity wall. An external gas source delivers gas to the plurality of air holes through the annular cavity, and the gas ejected from the plurality of air holes mixes the contrast agent in the premixing cavity. In the implementation process, water and solid barium agents are first directly added to the premixing cavity in proportion, and then the solid and liquid are evenly mixed by the gas ejected from the plurality of air holes. When the piston moves backward, the evenly mixed contrast agent moves backward along the inner cavity of the syringe, thereby avoiding the air holes and preventing the contrast agent from flowing back to the annular cavity. Subsequently, the movable plug is moved backward and across the premixing cavity to seal the contrast agent in the inner cavity of the syringe for convenient subsequent injection.

[0020] Preferably, the external gas source adopts a gas delivery ball 6, and the gas can be delivered to the annular cavity through the gas delivery tube 7 by squeezing the gas delivery ball. The gas delivery ball adopts an existing inflatable ball such as a sphygmomanometer. During implementation, an air inlet seat 43 is provided on the front side of the annular cavity, and one end of the gas delivery tube is plugged into the air inlet seat, and the other end is connected to the gas delivery ball. Providing the air inlet seat at the front end of the annular cavity can prevent the contrast agent from flowing back to the gas delivery tube. The design of the annular cavity adopted in the utility model has a buffering effect on the backflow of the contrast agent, that is, even if the fluid contrast agent flows into the annular cavity from the pore, it is difficult to flow into the air inlet seat at the front end thereof, because the height of the air inlet seat is higher than the height of the premixing chamber, and the liquid level of the contrast agent will not reach the height of the air inlet seat.

[0021] Preferably, a retaining ring 44 is provided on the rear side of the premixing chamber to prevent the piston from moving, so as to locate the position of the piston and prevent the piston from moving to the premixing chamber; one end of the channel is connected to the inner cavity of the syringe, and the other end of the channel is sealed by a detachable movable cover 8. When mixing contrast agents, the piston is located at the rear side of the premixing chamber through the retaining ring, and the movable plug is moved to the front side of the premixing chamber, so that the inner cavity section of the syringe between the piston and the movable plug forms a premixing chamber. Then, the movable cover is opened, and solid barium and water are added into the premixing chamber in proportion through the channel, and then gas is sprayed into the premixing chamber through the air hole to mix the contrast agent.

[0022] In the process of mixing contrast agents, the movable cover does not need to cover the channel, because the air holes of the premixing chamber are opened on the side wall, which impacts the contrast agent radially, and the channel is in the axial direction, so it is difficult for the contrast agent to leak out of the channel during mixing. At the same time, the opening of the channel allows the excess gas ejected from the air holes to flow out of the channel, ensuring the smooth progress of gas transmission and mixing. After the contrast agent is mixed, the piston is moved backward, and the contrast agent flows backward. At this time, the opening of the channel can avoid the formation of negative pressure in the inner cavity of the syringe, which causes the contrast agent to not flow backward; in the implementation process, after the contrast agent flows backward, even if there is contrast agent remaining in the annular cavity, it will flow from the annular cavity through the air holes into the inner cavity of the syringe due to the height difference. Then move the movable plug backward, cross the premixing chamber, and press against the retaining ring to prevent the movable plug from continuing to move backward. At this time, the channel is open, and the gas in the inner cavity of the syringe can be discharged, ensuring that the contrast agent can be injected quickly.

[0023] Preferably, the movable plug is connected to the inner cavity of the syringe by a threaded connection, and the movable plug is axially moved and can pass over the premixing chamber by screwing the thread. The threaded connection method is not only simple to process and more precise in movement; but also will not move due to pressure when injecting contrast agent. The movable plug is provided with several sealing rings 52 on the peripheral wall to seal the inner cavity of the syringe and prevent leakage of contrast agent. After opening the movable cover, the channel is connected to the anal canal 9, and then the contrast agent in the sealed inner cavity of the syringe is pushed from the channel into the anal canal under the action of the forward movement of the piston and the push rod to achieve the injection of the contrast agent. During the implementation process, the anal canal is made of disposable materials, which is easy to replace, hygienic and safe to use, and will not cause cross infection; the syringe can be reused to reduce the cost of use. A sealing cover 10 is provided at the end of the rear end of the syringe to ensure that the inner cavity of the syringe is not polluted by the external environment and further improve the hygiene standards.

Claims

1. An anorectal contrast agent premix injection device, comprising a syringe, a piston arranged at the rear end of the syringe, and a push rod connected to the piston, wherein pushing and pulling the push rod can drive the piston to move axially along the inner cavity of the syringe, characterized in that: A premixing chamber is provided at the front end of the syringe, and a movable plug is provided at the front end of the premixing chamber, and a channel is provided on the movable plug; after the contrast agent is mixed in the premixing chamber, the push rod is pulled backward to drive the piston to move so that the contrast agent flows backward along the inner cavity of the syringe, and then the movable plug is pushed backward to make it pass over the premixing chamber, and then the push rod is pushed forward to drive the piston to move so that the contrast agent is injected through the channel.

2. The anorectal contrast agent premix injection device according to claim 1, characterized in that: An annular cavity is formed in the cavity wall of the premixing cavity, and a plurality of air holes connected with the premixing cavity are opened on the annular cavity wall. An external gas source delivers gas to the plurality of air holes through the annular cavity, and the gas ejected from the plurality of air holes mixes the contrast agent in the premixing cavity.

3. The anorectal contrast agent premix injection device according to claim 2, characterized in that: The external gas source is a gas delivery ball, and the gas can be delivered to the annular cavity through a gas delivery pipe by squeezing the gas delivery ball.

4. The anorectal contrast agent premix injection device according to claim 3, characterized in that: An air inlet seat is arranged at the front side of the annular cavity, one end of the air delivery pipe is plugged into the air inlet seat, and the other end is connected to the air delivery ball.

5. The anorectal contrast agent premix injection device according to claim 1, characterized in that: A blocking ring is provided on the rear side of the premixing chamber to prevent the piston from moving.

6. The anorectal contrast agent premix injection device according to claim 1, characterized in that: One end of the channel is communicated with the inner cavity of the injection barrel, and the other end of the channel is sealed by a detachable movable cover.

7. The anorectal contrast agent premix injection device according to claim 6, characterized in that: The movable plug is connected to the inner cavity of the injection barrel by threaded connection.

8. The anorectal contrast agent premix injection device according to claim 7, characterized in that: A plurality of sealing rings are arranged on the peripheral wall of the movable plug.

9. The anorectal contrast agent premix injection device according to claim 6, characterized in that: After the movable cover is opened, the passage is connected with an anal canal.

10. The anorectal contrast agent premix injection device according to claim 1, characterized in that: A sealing cover is provided at the end of the rear end of the injection cylinder.

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