Needle cylinder and piston automatic combination and release mechanism

Abstract

The invention discloses an automatic combination and release mechanism for a needle cylinder and a piston, and relates to the technical field of medical instruments. The contrast agent injector is applied to contrast agent injection and comprises a base and a needle cylinder, the inner diameter of the needle cylinder is larger than that of the base, and the base and the needle cylinder are coaxially arranged and detachably connected; a push rod is coaxially arranged in the base, a connector is mounted at the end, facing the needle cylinder, of the push rod, a mounting seat is mounted at one end of the connector, the mounting seat and the push rod are coaxially arranged, and a fixing rod is fixedly connected to the center of the mounting seat. The characteristic that a piston and a push rod in a traditional push rod piston mechanism are difficult to separate is changed, automatic and rapid combination and separation of the push rod and the piston can be achieved, and when the mechanism is applied to an intelligent high-pressure injection system, medical staff can conveniently and rapidly replace a needle cylinder, so that a contrast agent is rapidly supplemented and injected, the injection time is shortened, and the working efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of medical instruments, in particular to an automatic combination and release mechanism for a syringe piston. Background Art

[0002] The contrast agent high-pressure syringe syringe in medical imaging equipment is mainly used to inject contrast agent in medical imaging examinations. Contrast agent is a special drug. By injecting it into the body, it can make certain tissues or organs more clearly visible in imaging examinations, thereby helping doctors to make a diagnosis. When using a high-pressure syringe to inject contrast agent, when the contrast agent in the syringe is used up, it needs to be replenished. However, in the traditional piston structure, the piston and the push rod are basically relatively fixed, and it is not convenient to quickly replace the syringe during injection control. The contrast catheter needs to be removed and the contrast agent needs to be inhaled with a straw for replenishment, which is very inconvenient during the imaging process. For this reason, we propose an automatic engagement and release mechanism for the syringe piston. Summary of the invention

[0003] The purpose of the present invention is to provide an automatic syringe-piston combination and release mechanism, which can realize the rapid separation and combination of the push rod and the piston, thereby realizing the rapid replacement of the syringe and solving the inconvenience of contrast agent replenishment.

[0004] To achieve the above-mentioned object, the present invention provides the following technical solutions: a syringe piston automatic combination and release mechanism, applied to contrast agent injection, comprising a base and a syringe, the inner diameter of the syringe is larger than the inner diameter of the base, the base and the syringe are coaxially arranged, and the two are detachably connected;

[0005] A push rod is coaxially arranged inside the base, a connector is installed at one end of the push rod facing the syringe, a mounting seat is installed at one end of the connector, the mounting seat and the push rod are coaxially arranged, and a fixing rod is fixedly connected to the center position of the mounting seat, and a first groove adapted to the connector is opened at one end of the fixing rod facing the connector;

[0006] At least two sets of fixing mechanisms are arranged on the mounting seat, and a piston is detachably mounted on one end of the fixing mechanism facing the syringe, and the piston is located inside the syringe and is coaxially arranged with the syringe.

[0007] Furthermore, the connector as a whole is arranged in a stepped shape from the middle to the two ends, and the diameter of the middle part is larger than the diameters of the two ends.

[0008] Furthermore, a mounting groove matched with the push rod is formed at one end of the mounting seat facing the push rod, and the push rod and the connector are both snapped into the mounting groove.

[0009] Furthermore, a first step groove matching the connector is provided at the end of the push rod, and a second step groove matching the connector is also provided on the inner wall of the mounting groove. Both ends of the connector are connected to the push rod and the mounting seat respectively through the first step groove and the second step groove.

[0010] Furthermore, the fixing rod is connected to the connector via the first groove, and the fixing rod is located between the second stepped groove of the mounting seat and the connector.

[0011] Further, the fixing mechanism comprises a receiving cavity opened inside the mounting seat, the receiving cavity is set to be open at one end facing the piston, a pin is fixedly connected to the inner wall of the receiving cavity, a hook is rotatably connected to the pin, and a torsion spring is sleeved on the outer surface of the pin, one end of the torsion spring is connected to the hook, and the other end is connected to the pin, for pushing the hook outward;

[0012] A limiting pin is fixedly connected to the inner wall of the accommodating cavity, a limiting groove is arranged on the side wall of the hook claw, and the limiting pin is located in the limiting groove.

[0013] Furthermore, a curved groove matched with the hook claw is provided in the middle portion of the fixing rod, and a second groove matched with the fixing rod is provided on the side of the piston facing the fixing rod.

[0014] Furthermore, a side groove adapted to the hook claw is provided on the side wall of the accommodating cavity.

[0015] Furthermore, at least two buckles are fixedly connected to the side wall of the piston facing the fixing rod, and the buckles are clamped in the opening of the accommodating cavity and are adapted to each other with the hook claws.

[0016] The present invention has at least the following beneficial effects:

[0017] The present invention changes the characteristic that the piston and the push rod in the traditional push rod-piston mechanism are difficult to separate, and can realize the automatic and rapid combination and separation of the push rod and the piston. When used in an intelligent high-pressure injection system, it is convenient for medical personnel to quickly replace syringes, thereby quickly replenishing and injecting contrast agents, reducing injection time and improving work efficiency.

[0018] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the hook and the piston in the uncombined state in the present invention;

[0020] Figure 2 It is a structural schematic diagram of the hook claw and the piston in the present invention;

[0021] Figure 3It is a schematic diagram of the structure of the hook claw and the piston in the released state in the present invention.

[0022] Reference numerals:

[0023] 1. Base; 2. Syringe; 3. Push rod; 4. Connector; 5. Mounting seat; 6. Fixing rod; 7. First groove; 8. Fixing mechanism; 81. Accommodating chamber; 82. Pin shaft; 83. Hook; 84. Torsion spring; 85. Limit pin; 86. Limit groove; 9. Piston; 10. Mounting groove; 11. First step groove; 12. Second step groove; 13. Arc groove; 14. Second groove; 15. Side groove; 16. Buckle. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0025] See also Figure 1-Figure 3 The present invention provides a technical solution: a syringe piston automatic combination and release mechanism, applied to contrast agent injection, comprising a base 1 and a syringe 2, the inner diameter of the syringe 2 is larger than the inner diameter of the base 1, the base 1 and the syringe 2 are coaxially arranged, and the two are detachably connected;

[0026] A push rod 3 is coaxially arranged inside the base 1, and a connector 4 is installed at one end of the push rod 3 facing the syringe 2, and a mounting seat 5 is installed at one end of the connector 4. The mounting seat 5 and the push rod 3 are coaxially arranged, and a fixing rod 6 is fixedly connected to the center position of the mounting seat 5. The fixing rod 6 is provided with a first groove 7 adapted to the connector 4 at one end thereof facing the connector 4;

[0027] At least two sets of fixing mechanisms 8 are arranged on the mounting seat 5 . A piston 9 is detachably mounted on one end of the fixing mechanism 8 facing the syringe 2 . The piston 9 is located inside the syringe 2 and is coaxially arranged with the syringe 2 .

[0028] It should be noted that, in actual use, the base 1 will be fixed in the high-pressure syringe, and the push rod 3 will be connected to the driving assembly, and the driving assembly will be used to push the push rod 3 to move in a straight line. The driving assembly can be set to a motor and a screw rod, or it can be set to an electric cylinder. This embodiment does not make specific limitations on this, and it can be selected according to actual conditions. As long as it can push the push rod 3 to make it move in a straight line in the base 1 and the syringe 2, this is the prior art and will not be repeated here.

[0029] Furthermore, the base 1 and the syringe 2 are connected by a buckle 16 (not shown in the figure), so that the syringe 2 can be removed from the base 1 for replacement as needed.

[0030] According to the technical solution of this embodiment, the connector 4 is arranged in a stepped shape from the middle to the two ends, and the diameter of the middle part is larger than the diameter of the two ends. The mounting seat 5 is provided with a mounting groove 10 adapted to the push rod 3 at one end facing the push rod 3. The push rod 3 and the connector 4 are both clamped in the mounting groove 10. The push rod 3 and the mounting seat 5 can be connected together by using the provided connector 4, which is convenient for enhancing the connection strength between the push rod 3 and the mounting seat 5, and preventing the mounting seat 5 from falling off when the piston 9 is pushed to move.

[0031] Furthermore, a first step groove 11 adapted to the connector 4 is provided at the end of the push rod 3, and a second step groove 12 adapted to the connector 4 is also provided on the inner wall of the mounting groove 10. The two ends of the connector 4 are respectively connected to the push rod 3 and the mounting seat 5 through the first step groove 11 and the second step groove 12. The first step groove 11 is used to enhance the connection strength between the connector 4 and the push rod 3, and the second step groove 12 is used to enhance the connection strength between the connector 4 and the mounting seat 5.

[0032] Furthermore, the fixing rod 6 is connected to the connector 4 through the first groove 7, and the fixing rod 6 is located between the second step groove 12 of the mounting seat 5 and the connector 4. By snapping the connector 4 into the first step groove 11 of the push rod 3, and then snapping the connector 4 and the push rod 3 together into the mounting groove 10 of the mounting seat 5, and making the other end of the connector 4 snap into the first groove 7 of the fixing rod 6, a fixed connection between the push rod 3, the connector 4 and the mounting seat 5 can be achieved.

[0033] According to the technical solution of this embodiment, the fixing mechanism 8 includes an accommodating chamber 81 opened inside the mounting seat 5, and the end of the accommodating chamber 81 facing the piston 9 is set to be open. A pin 82 is fixedly connected to the inner wall of the accommodating chamber 81, and a hook 83 is rotatably connected to the pin 82. A torsion spring 84 is sleeved on the outer surface of the pin 82, and one end of the torsion spring 84 is connected to the hook 83, and the other end is connected to the pin 82. The elastic potential energy provided by the torsion spring 84 is used to facilitate pushing the hook 83 outwards.

[0034] A limit pin 85 is fixedly connected to the inner wall of the accommodating cavity 81, and a limit groove 86 is provided on the side wall of the hook claw 83. The limit pin 85 is located in the limit groove 86. When the hook claw 83 deflects around the pin shaft 82, the set limit pin 85 and the limit groove 86 can limit the deflection position of the hook claw 83 to prevent the hook claw 83 from excessive deflection.

[0035] According to the technical solution of this embodiment, an arcuate groove 13 adapted to the hook claw 83 is provided in the middle portion of the fixing rod 6, and a second groove 14 adapted to the fixing rod 6 is provided on the side of the piston 9 facing the fixing rod 6. The arcuate groove 13 is used to provide a movable space for the hook claw 83 when the hook claw 83 deflects inward, and the second groove 14 is used to not only enhance the connection strength between the mounting seat 5 and the piston 9, but also facilitate the positioning of the connection position of the piston 9 and the mounting seat 5, thereby realizing the precise fixation of the piston 9 by the fixing mechanism 8.

[0036] With respect to the technical solution of this embodiment, a convex portion is provided on the outer wall of the hook claw 83, and a side groove 15 matched with the convex portion of the hook claw 83 is opened on the side wall of the accommodating chamber 81, so that the convex portion is located outside the accommodating chamber 81. When the hook claw 83 is located in the syringe 2, since the inner diameter of the syringe 2 is greater than the distance between the convex portions, the hook claw 83 and its convex portion can move smoothly in the syringe 2. At this time, due to the action of the torsion spring 84 and the limit pin 85, the hook claw 83 can be kept deflected outward to the maximum extent. At this time, the hook claw 83 is in a locked state with respect to the piston 9. When the hook claw 83 and its convex portion move to the connection position between the base 1 and the syringe 2, since the inner diameter of the base 1 is less than the distance between the convex portions, the convex portion will be squeezed. When the convex portion is squeezed, the entire hook claw 83 will deflect inward and move to the position of the arc groove 13. At this time, the hook claw 83 is in an unlocked state with respect to the piston 9.

[0037] For the technical solution of this embodiment, Figure 1 and Figure 2 As shown, at least two buckles 16 are fixedly connected to the side wall of the piston 9 facing the fixed rod 6. The buckles 16 are clamped in the opening of the accommodating chamber 81 and fit with the hook claws 83. The side surfaces of the buckles 16 and the hook claws 83 in contact are arranged in an inclined shape, so that when the piston 9 needs to be locked after the hook claws 83 are squeezed, the push rod 3 is first pushed by an external driving component to drive the mounting seat 5 and the hook claws 83 to approach the piston 9. When the hook claws 83 move to contact with the buckles 16, they will move along the inclined surface of the buckles 16 and be squeezed by the inclined surface of the buckles 16 and deflected inwardly, so that the buckles 16 are confined between the inner wall of the accommodating chamber 81 and the hook claws 83, so that the piston 9 can be locked. Then, the push rod 3 is continuously pushed to move the piston 9 in the syringe 2, so as to complete the injection of the contrast agent.

[0038] like Figure 3As shown, when the syringe 2 needs to be replaced, the push rod 3 is driven by the driving assembly to move in the opposite direction for reset. At this time, the push rod 3 and the mounting head will drive the piston 9 to move toward the base 1. When the hook 83 and its convex portion move to the connection position between the base 1 and the syringe 2, since the inner diameter of the base 1 is smaller than the distance between the convex portions, the convex portions will be squeezed. When the convex portions are squeezed, the entire hook 83 will deflect inward and move to the position of the arc groove 13, thereby disengaging the hook 83 from the buckle 16 to unlock the piston 9. Then, as the mounting seat 5 and the hook 83 continue to move, the piston 9 will separate from the mounting head. At this time, the piston 9 will remain in the syringe 2 due to the friction of the syringe 2. By removing the syringe 2 from the base 1, the replacement can be quickly completed, which is convenient for quickly replenishing new contrast agent when a single tube of contrast agent does not meet the injection requirements.

[0039] The use principle and process of the present invention are as follows: when contrast agent needs to be injected, the syringe 2 filled with contrast agent is first mounted on the base 1, and then the push rod 3 is pushed by the external driving assembly to drive the mounting seat 5 and the hook 83 to approach the piston 9. When the hook 83 moves to contact the buckle 16, it moves along the inclined surface of the buckle 16 and is squeezed inward by the inclined surface of the buckle 16, thereby limiting the buckle 16 between the inner wall of the accommodating cavity 81 and the hook 83, thereby locking the piston 9. Then, the push rod 3 is continuously pushed to move the piston 9 in the syringe 2, thereby completing the injection of contrast agent.

[0040] When the syringe 2 needs to be replaced, the push rod 3 is driven by the driving assembly to move in the opposite direction for reset. At this time, the push rod 3 and the mounting head will drive the piston 9 to move toward the base 1. When the hook 83 and its convex portion move to the connection position between the base 1 and the syringe 2, since the inner diameter of the base 1 is smaller than the distance between the convex portions, the convex portions will be squeezed. When the convex portions are squeezed, the entire hook 83 will deflect inward and move to the position of the arc groove 13, thereby disengaging the hook 83 from the buckle 16 to unlock the piston 9. Then, as the mounting seat 5 and the hook 83 continue to move, the piston 9 will separate from the mounting head. At this time, the piston 9 will remain in the syringe 2 due to the friction of the syringe 2. By removing the syringe 2 from the base 1, the replacement can be completed quickly, which is convenient for quickly replenishing new contrast agent when a single tube of contrast agent does not meet the injection requirements.

[0041] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0042] For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. When an element is referred to as being "assembled on", "installed on", "fixed on" or "set on" another element, it can be directly on the other element or there can also be a centered element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be a centered element at the same time. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for illustrative purposes and are not intended to be the only implementation method.

[0043] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

[0044] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

Claims

1. A syringe piston automatic engagement and release mechanism, used for contrast medium injection, comprising a base (1) and a syringe (2), characterized in that: The inner diameter of the syringe (2) is greater than the inner diameter of the base (1); the base (1) and the syringe (2) are coaxially arranged and detachably connected. A push rod (3) is coaxially arranged inside the base (1); a connector (4) is installed at one end of the push rod (3) facing the syringe (2); a mounting seat (5) is installed at one end of the connector (4); the mounting seat (5) and the push rod (3) are coaxially arranged, and a fixing rod (6) is fixedly connected at the center of the mounting seat (5); and a first groove (7) adapted to the connector (4) is provided at one end of the fixing rod (6) facing the connector (4); At least two sets of fixing mechanisms (8) are arranged on the mounting seat (5); a piston (9) is detachably mounted on one end of the fixing mechanism (8) facing the syringe (2); the piston (9) is located inside the syringe (2) and is coaxially arranged with the syringe (2).

2. The syringe piston automatic engagement and release mechanism according to claim 1, characterized in that: The connector (4) is arranged in a stepped manner from the middle to the two ends as a whole, and the diameter of the middle part is larger than the diameters of the two ends.

3. The syringe piston automatic engagement and release mechanism according to claim 2, characterized in that: The mounting seat (5) is provided with a mounting groove (10) matched with the push rod (3) at one end thereof facing the push rod (3), and the push rod (3) and the connector (4) are both clamped in the mounting groove (10).

4. The automatic syringe piston engagement and release mechanism according to claim 3, characterized in that: The end of the push rod (3) is provided with a first stepped groove (11) adapted to the connector (4), and the inner wall of the mounting groove (10) is also provided with a second stepped groove (12) adapted to the connector (4). The two ends of the connector (4) are respectively connected to the push rod (3) and the mounting seat (5) through the first stepped groove (11) and the second stepped groove (12).

5. The syringe piston automatic engagement and release mechanism according to claim 4, characterized in that: The fixing rod (6) is connected to the connector (4) via the first groove (7), and the fixing rod (6) is located between the second stepped groove (12) of the mounting seat (5) and the connector (4).

6. The syringe piston automatic engagement and release mechanism according to claim 5, characterized in that: The fixing mechanism (8) comprises a receiving chamber (81) opened inside the mounting seat (5), the receiving chamber (81) is arranged in an open shape at one end facing the piston (9), a pin shaft (82) is fixedly connected to the inner wall of the receiving chamber (81), a hook (83) is rotatably connected to the pin shaft (82), and a torsion spring (84) is sleeved on the outer surface of the pin shaft (82), one end of the torsion spring (84) is connected to the hook (83), and the other end is connected to the pin shaft (82), and is used to push the hook (83) outward; A limiting pin (85) is fixedly connected to the inner wall of the accommodating cavity (81), a limiting groove (86) is provided on the side wall of the hook claw (83), and the limiting pin (85) is located in the limiting groove (86).

7. The syringe piston automatic engagement and release mechanism according to claim 6, characterized in that: The middle portion of the fixing rod (6) is provided with an arc surface groove (13) adapted to the hook claw (83), and the side of the piston (9) facing the fixing rod (6) is provided with a second groove (14) adapted to the fixing rod (6).

8. The syringe piston automatic engagement and release mechanism according to claim 6, characterized in that: A side groove (15) adapted to the hook claw (83) is provided on the side wall of the accommodating cavity (81).

9. The syringe piston automatic engagement and release mechanism according to claim 8, characterized in that: At least two buckles (16) are fixedly connected to the side wall of the piston (9) facing the fixed rod (6), and the buckles (16) are clamped in the opening of the accommodating cavity (81) and are mutually adapted with the hook claws (83).

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