Disposable contrast agent injection pump for nuclear magnetic resonance examination

Abstract

The invention discloses a disposable nuclear magnetic resonance imaging contrast agent injection pump which comprises a pump body, a storage chamber and a vacuum chamber are located at the two ends of the pump body respectively, and a contrast agent is placed in the storage chamber; a first piston and a second piston are respectively arranged in the storage chamber and the vacuum chamber, are respectively peripherally sealed with the storage chamber and the vacuum chamber and can axially slide, and the first piston and the second piston are connected through a connecting rod; an injection port is formed in the end, away from the vacuum chamber, of the storage chamber, and an openable first air port is formed in the end, away from the storage chamber, of the vacuum chamber. When the injection pump injects a contrast agent, the first air port is opened, so that the cavity of the vacuum chamber located on the side, away from the first piston, of the second piston communicates with the outside atmosphere, and under the pressure of the outside atmosphere, the second piston is pushed to drive the first piston to move, so that the contrast agent is pushed out from the injection port. The injection pump not only is simple in structure and low in production cost, but also does not need complex operation.

Description

Technical Field

[0001] The invention relates to the field of medical instruments, and in particular to a disposable nuclear magnetic resonance examination contrast agent push pump. Background Art

[0002] Magnetic resonance imaging (MRI) uses radio frequency pulses to excite atomic nuclei with non-zero spins placed in a magnetic field. After the radio frequency pulse stops, the atomic nuclei relax. During the relaxation process, the induction coil collects signals and reconstructs them into mathematical images according to certain mathematical methods. In order to enhance the difference in image signal intensity, exogenous contrast agents are usually injected in the existing MRI process.

[0003] Traditional contrast agent injection equipment requires a mechanical syringe, which has high equipment cost, complex structure and cumbersome operation. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the above-mentioned defects in the prior art and provide a disposable nuclear magnetic resonance examination contrast agent injection pump.

[0005] The present invention solves the above technical problems through the following technical solutions:

[0006] The present invention provides a disposable nuclear magnetic resonance examination contrast agent push pump, the push pump comprises a pump body, the pump body comprises a storage chamber and a vacuum chamber, the storage chamber and the vacuum chamber are respectively located at two ends of the pump body, and contrast agent is placed in the storage chamber;

[0007] The storage chamber and the vacuum chamber are respectively provided with a first piston and a second piston, the first piston and the second piston are respectively sealed with the storage chamber and the vacuum chamber in a circumferential direction and can slide axially, and the first piston and the second piston are connected by a connecting rod;

[0008] An injection port is provided at an end of the storage chamber away from the vacuum chamber, and an openable first air port is provided at an end of the vacuum chamber away from the storage chamber.

[0009] In this solution, after the push pump is produced, the cavities of the vacuum chamber on both sides of the second piston are in a vacuum state, a certain dose of contrast agent is pre-installed in the storage chamber, and when the contrast agent is injected through the push pump, the first air port is opened so that the cavity of the vacuum chamber on the side of the second piston away from the first piston is connected to the outside atmosphere, and under the pressure of the outside atmosphere, the second piston is pushed to drive the first piston to move, thereby pushing the contrast agent out of the injection port. The push pump is not only simple in structure and low in production cost, but also does not require complicated operations.

[0010] Preferably, the push injection pump further comprises a limiting mechanism, and the limiting mechanism is used to limit the moving distance of the connecting rod in the axial direction of the pump body.

[0011] In this solution, the moving distance of the connecting rod is limited by the limiting mechanism, thereby limiting the moving distance of the first piston, and the injection volume can be controlled as needed.

[0012] Preferably, the limiting mechanism includes a first limiting member and a second limiting member, the first limiting member is arranged between the storage chamber and the vacuum chamber and can move along the axial direction of the connecting rod and can be positioned at a plurality of preset positions, the second limiting member is arranged on the connecting rod, and when the second limiting member abuts against the first limiting member, the first limiting member prevents the connecting rod from moving.

[0013] In this solution, by setting a plurality of preset positions to limit the movement of the connecting rod, different injection volumes can be selected as needed.

[0014] Preferably, a strip hole extending along the axial direction of the connecting rod is provided on the side wall of the pump body between the storage chamber and the vacuum chamber, the limiting mechanism comprises a blocking member and a limiting rod, the blocking member has a plurality of blocking members and the plurality of blocking members are arranged on the pump body at intervals along the extending direction of the strip hole, the limiting rod is arranged on the connecting rod, and the limiting rod extends out of the strip hole and can move in the strip hole;

[0015] The blocking member is configured to move between a first position and a second position. When in the first position, the blocking member covers the strip-shaped hole. When in the second position, the blocking member is misaligned with the strip-shaped hole.

[0016] Preferably, a mark is correspondingly arranged at the preset position, and the mark is used to indicate the injection volume.

[0017] Preferably, the distance from the second piston to the end of the vacuum chamber close to the storage chamber is not less than the distance from the first piston to the injection port.

[0018] Preferably, a second closable air port is provided on a side wall of the vacuum chamber at one end close to the storage chamber.

[0019] Preferably, the pump body comprises a first cylinder and a second cylinder which are detachably connected, the storage chamber is arranged in the first cylinder, and the vacuum chamber is arranged in the second cylinder.

[0020] Preferably, the first cylinder and the second cylinder are connected by threads.

[0021] Preferably, the push injection pump further comprises a sealing cover, and the sealing cover is used for sealing the injection port.

[0022] Preferably, the injection pump is made of non-metallic material.

[0023] The positive progressive effect of the present invention is that after the push pump of the present invention is produced, the cavities of the vacuum chamber on both sides of the second piston are in a vacuum state, a certain dose of contrast agent is pre-installed in the storage chamber, and when the contrast agent is injected through the push pump, the first air port is opened, so that the cavity of the vacuum chamber on the side of the second piston away from the first piston is connected to the outside atmosphere, and under the pressure of the outside atmosphere, the second piston is pushed to drive the first piston to move, thereby pushing the contrast agent out of the injection port. The push pump is not only simple in structure and low in production cost, but also does not require complicated operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of the internal structure of the push pump in Example 1 of the present invention.

[0025] Figure 2 for Figure 1 Schematic diagram of the external structure of the medium push injection pump.

[0026] Figure 3 Schematic diagram of the structure of the push pump in Example 2 of the present invention.

[0027] Figure 4 for Figure 3 Schematic diagram of the internal structure of the medium push injection pump.

[0028] Description of reference numerals:

[0029] Pump body 100, first cylinder 110, storage chamber 111, injection port 112, strip hole 113, second cylinder 120, vacuum chamber 121, first air port 122, second air port 123, first piston 200, second piston 300, connecting rod 400, second stopper 500, sealing cover 600, first stopper 700. DETAILED DESCRIPTION

[0030] The present invention is further described below by way of embodiments in conjunction with the accompanying drawings, but the present invention is not limited to the scope of the following embodiments.

[0031] Example 1

[0032] like Figure 1-2As shown, this embodiment provides a disposable contrast agent push pump for nuclear magnetic resonance examination, the push pump includes a pump body 100, the pump body 100 includes a storage chamber 111 and a vacuum chamber 121, the storage chamber 111 and the vacuum chamber 121 are respectively located at the two ends of the pump body 100, and contrast agent is placed in the storage chamber 111. The first piston 200 and the second piston 300 are respectively arranged in the storage chamber 111 and the vacuum chamber 121, the first piston 200 and the second piston 300 are respectively sealed with the storage chamber 111 and the vacuum chamber 121 in the circumferential direction and can slide axially, and the first piston 200 and the second piston 300 are connected by a connecting rod 400. An injection port 112 is provided at the end of the storage chamber 111 away from the vacuum chamber 121, and an openable first air port 122 is provided at the end of the vacuum chamber 121 away from the storage chamber 111.

[0033] In this embodiment, after the push pump is produced, the cavities of the vacuum chamber 121 on both sides of the second piston 300 are in a vacuum state, and a certain dose of contrast agent is pre-installed in the storage chamber 111. When the contrast agent is injected through the push pump, the first air port 122 is opened, so that the cavity of the vacuum chamber 121 on the side of the second piston 300 away from the first piston 200 is connected to the outside atmosphere. Under the pressure of the outside atmosphere, the second piston 300 is pushed to drive the first piston 200 to move, thereby pushing the contrast agent out of the injection port 112. The push pump is not only simple in structure and low in production cost, but also does not require complicated operations.

[0034] The push injection pump further includes a limiting mechanism, which is used to limit the moving distance of the connecting rod 400 in the axial direction of the pump body 100. By limiting the moving distance of the connecting rod 400 by the limiting mechanism, the moving distance of the first piston 200 can be limited, and the injection volume can be controlled as needed.

[0035] Specifically, the limiting mechanism includes a first limiting member 700 and a second limiting member 500. The first limiting member 700 is disposed between the storage chamber 111 and the vacuum chamber 121 and can move along the axial direction of the connecting rod 400 and can be positioned at a plurality of preset positions. The second limiting member 500 is disposed on the connecting rod 400. When the second limiting member 500 abuts against the first limiting member 700, the first limiting member 700 prevents the connecting rod 400 from moving. By setting a plurality of preset positions to limit the movement of the connecting rod 400, different injection volumes can be selected as needed.

[0036] In this embodiment, a strip hole 113 extending axially along the connecting rod 400 is provided on the side wall of the pump body 100 between the storage chamber 111 and the vacuum chamber 121. The limiting mechanism includes a blocking member (a first limiting member 700) and a limiting rod (a second limiting member 500). There are multiple blocking members and the multiple blocking members are arranged on the pump body 100 at intervals along the extension direction of the strip hole 113. The limiting rod is arranged on the connecting rod 400, and the limiting rod extends out of the strip hole 113 and can move in the strip hole 113. The blocking member is arranged to move between a first position and a second position. In the first position, the blocking member covers the strip hole 113, and in the second position, the blocking member is misaligned with the strip hole 113.

[0037] See also Figure 1-2 As shown, the blocking member is a circular ring structure, and the blocking member of the circular ring structure has a break so that the two ends of the ring are not connected, and the width of the break is not less than the width of the strip hole 113. The blocking member is sleeved on the pump body 100 and can rotate. When rotating, when the break completely overlaps with the strip hole 113 (the second position), the limit rod can move along the strip hole 113 without hindrance. When the break does not completely overlap with the strip hole 113 or does not overlap (the first position), the blocking member will prevent the limit rod from moving in the strip hole 113.

[0038] In some embodiments, a mark is provided corresponding to the preset position for positioning the first stopper 700 on the pump body 100, and the mark is used to indicate the injection volume. For example, 15mL, 20mL, and 25mL are marked on the three stoppers on the pump body 100 of this embodiment from right to left, and 30mL is marked on the leftmost side of the strip hole 113. When the rightmost stopper is moved to a position (first position) that can block the movement of the stopper rod, the second piston 300 drives the first piston 200 to move through the connecting rod 400, which will be blocked by the stopper rod on the connecting rod 400 and cannot move. At this time, the injection volume of the contrast agent is 15mL; similarly, when the middle stopper is moved to a position (first position) that can block the movement of the stopper rod, the injection volume of the contrast agent is 20mL, and when the left stopper is moved to a position (first position) that can block the movement of the stopper rod, the injection volume of the contrast agent is 25mL. If the stopper rod does not block the movement of the stopper rod, the injection volume of the contrast agent is 30mL.

[0039] The distance between the second piston 300 and the end of the vacuum chamber 121 close to the storage chamber 111 is not less than the distance between the first piston 200 and the injection port 112. This ensures that the first piston 200 can completely push out the contrast agent in the storage chamber 111.

[0040] In this embodiment, the pump body 100 includes a first barrel 110 and a second barrel 120 that are detachably connected, a storage chamber 111 is disposed in the first barrel 110, and a vacuum chamber 121 is disposed in the second barrel 120. An inner thread is disposed on the outer circumference of the barrel wall of the first barrel 110 at one end away from the injection port 112, and an outer thread is disposed on the inner circumference of the barrel wall of the second barrel 120 at one end away from the first gas port 122, and the first barrel 110 and the second barrel 120 are connected by threads. The pump body 100 is made into a detachably connected first barrel 110 and second barrel 120, which is convenient for production and installation.

[0041] The position where the connecting rod 400 passes through the second cylinder 120 is sealed so that external gas will not easily enter the vacuum chamber 121 without affecting the movement of the connecting rod 400. After production, the push pump can be stored in a vacuum packaging bag and taken out when in use.

[0042] In this embodiment, the push pump further includes a sealing cover 600, which is used to seal the injection port 112. The sealing cover 600 can not only prevent the contrast agent in the storage chamber 111 from being contaminated by the outside world, but also prevent the contrast agent from accidentally flowing out. The sealing cover 600 can be a screw cap, which is rotatably fixed on the injection port 112, or it can be fixed by a buckle structure.

[0043] A second air port 123 that can be closed is provided on the side wall of the vacuum chamber 121 at one end close to the storage chamber 111. Figure 2 As shown, the second air port 123 is disposed on the second cylinder 120 . By providing the second air port 123 , the vacuum chamber 121 can be evacuated through the first air port 122 and the second air port 123 when producing the push pump.

[0044] Since the push pump needs to be used in nuclear magnetic resonance, in order to avoid accidents, the push pump is made of non-metallic materials, preferably plastic. The pump body 100 can also be made of pure titanium or other metals that are not attracted by magnetic fields.

[0045] Example 2

[0046] In this embodiment, the other structures of the injection pump are the same as those in Embodiment 1, except that: Figure 3-4 In Example 2, the side wall of the pump body 100 is provided with two centrosymmetrical arc-shaped strip holes 113 between the storage chamber 111 and the vacuum chamber 121. The first stopper 700 is a disc disposed inside the pump body 100. The disc has a through hole in the middle. The disc is sleeved on the connecting rod 400 and can slide relative to the connecting rod 400. Two centrosymmetrical sliders are provided on the outer circumference of the disc. The two sliders are respectively inserted into the strip holes 113. The second stopper 500 is a stopper block disposed on the connecting rod 400. The stopper block can abut against the disc to prevent the connecting rod 400 from moving.

[0047] Matching positioning mechanisms (not shown in the figure) are provided on the two sliders of the disc and at different positions of the strip grooves on the pump body 100. The disc can be positioned at different positions to define different injection volumes through the positioning mechanisms.

[0048] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that this is only for illustration and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A disposable MRI contrast agent injection pump, characterized in that: The push pump comprises a pump body, the pump body comprises a storage chamber and a vacuum chamber, the storage chamber and the vacuum chamber are respectively located at two ends of the pump body, and a contrast agent is placed in the storage chamber; The storage chamber and the vacuum chamber are respectively provided with a first piston and a second piston, the first piston and the second piston are respectively sealed with the storage chamber and the vacuum chamber in a circumferential direction and can slide axially, and the first piston and the second piston are connected by a connecting rod; An injection port is provided at an end of the storage chamber away from the vacuum chamber, and an openable first air port is provided at an end of the vacuum chamber away from the storage chamber; The push injection pump further comprises a limiting mechanism, and the limiting mechanism is used to limit the moving distance of the connecting rod in the axial direction of the pump body.

2. The disposable MRI contrast agent injection pump according to claim 1, characterized in that: The limiting mechanism includes a first limiting member and a second limiting member. The first limiting member is arranged between the storage chamber and the vacuum chamber and can move along the axial direction of the connecting rod and can be positioned at multiple preset positions. The second limiting member is arranged on the connecting rod. When the second limiting member abuts against the first limiting member, the first limiting member prevents the connecting rod from moving.

3. The disposable nuclear magnetic resonance contrast agent injection pump according to claim 2, characterized in that: A strip hole extending along the axial direction of the connecting rod is provided on the side wall of the pump body between the storage chamber and the vacuum chamber, the limiting mechanism comprises a blocking member and a limiting rod, the blocking member has a plurality of blocking members and the plurality of blocking members are arranged on the pump body at intervals along the extending direction of the strip hole, the limiting rod is arranged on the connecting rod, the limiting rod extends out of the strip hole and can move in the strip hole; The blocking member is configured to move between a first position and a second position. When in the first position, the blocking member covers the strip-shaped hole. When in the second position, the blocking member is misaligned with the strip-shaped hole.

4. The disposable MRI contrast agent injection pump according to claim 1, characterized in that: The distance from the second piston to one end of the vacuum chamber close to the storage chamber is not less than the distance from the first piston to the injection port.

5. The disposable MRI contrast agent injection pump according to claim 1, characterized in that: A second closable air port is provided on a side wall of the vacuum chamber at one end close to the storage chamber.

6. The disposable MRI contrast agent injection pump according to claim 1, characterized in that: The pump body comprises a first cylinder and a second cylinder which are detachably connected, the storage chamber is arranged in the first cylinder, and the vacuum chamber is arranged in the second cylinder.

7. The disposable MRI contrast agent injection pump according to claim 6, characterized in that: The first cylinder and the second cylinder are connected by threads.

8. The disposable nuclear magnetic resonance imaging contrast agent injection pump according to claim 1, characterized in that: The push injection pump also includes a sealing cover, which is used to seal the injection port.

9. The disposable nuclear magnetic resonance imaging contrast agent injection pump according to any one of claims 1 to 8, characterized in that: The push pump is made of non-metallic material.

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