One-way rotation mechanism and syringe having the same

Abstract

The present invention provides a one-way rotation mechanism and a syringe having the same, the one-way rotation mechanism comprises a screw and a piston at one end of the screw, and also comprises a fixed component, a rotating component, a connecting component and an elastic component, the connecting component cannot rotate relative to the fixed component, the elastic component is arranged between the fixed component and the connecting component, under the action of the elastic component, the connecting component has a blocking state for blocking the rotating component from rotating in a first direction, and the connecting component has a evasive state for allowing the rotating component to rotate in a second direction. The one-way rotation mechanism has a simple structure and good stability.

Description

Technical Field

[0001] The present invention relates to the technical field of medical equipment, and in particular to a one-way rotating mechanism and a syringe having the same. Background Art

[0002] Diabetic patients need an insulin syringe that can be carried at any time and is easy to use. There are related injection products on the market. Most syringes use the screw drive principle, which can achieve the purpose of moving the push rod forward by rotation. Most syringes are used in the same way. First, turn the tail screw tube to rotate to the desired scale, then insert the needle at the other end into the body where the injection is to be made, and then push the tail push handle to inject the drug.

[0003] However, in the prior art, the unidirectional movement of the rotating member is restricted to ensure the unidirectional rotation of the screw to complete the injection operation of the preset dose. However, the structures for restricting the unidirectional movement of the rotating member have the problems of complex structure, poor stability and high cost. Summary of the invention

[0004] The main purpose of the present invention is to provide a one-way rotation mechanism and a syringe having the same, so as to solve the problems of complex structure, poor stability and high cost in the prior art for limiting the one-way movement of a rotating component.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a one-way rotation mechanism for a syringe is provided, comprising a screw and a piston arranged at one end of the screw, the one-way rotation mechanism also comprising: a fixed member, the fixed member does not move relative to the syringe housing, the screw is inserted into the fixed member and is threadedly connected to the fixed member; a rotating member, the screw is inserted into the rotating member, and the screw is rotated relative to the fixed member by the rotation of the rotating member, so that the screw drives the piston to move; a connecting member, the connecting member is arranged between the fixed member and the rotating member, and the connecting member cannot rotate relative to the fixed member; the connecting member has a blocking state for blocking the rotating member from rotating in a first direction, and the connecting member has an avoidance state for allowing the rotating member to rotate in a second direction, wherein one of the first direction and the second direction is a clockwise direction, and the other of the first direction and the second direction is a counterclockwise direction; an elastic member, arranged between the fixed member and the connecting member, and the connecting member is placed in a blocking state or an avoidance state through elastic deformation of the elastic member.

[0006] Furthermore, a first one-way gear is arranged on the connecting member, and a second one-way gear meshing with the first one-way gear is arranged on the rotating member.

[0007] Further, the elastic component includes: a supporting end and an elastic end, wherein the supporting end is arranged on the inner tube wall of the fixed component, and the elastic end is extended in a direction away from the fixed component to abut against the connecting component; or, the supporting end is arranged on the connecting component, and the elastic end is extended in a direction away from the connecting component to abut against the fixed component.

[0008] Furthermore, the elastic end further comprises: a protrusion, and the protrusion abuts against the connecting member or the fixing member.

[0009] Furthermore, the elastic end is arc-shaped or spiral-shaped.

[0010] Furthermore, the outer peripheral surface of the protrusion is at least a part of a spherical surface.

[0011] Furthermore, the elastic component is a spring.

[0012] Furthermore, the elastic component is integrally injection-molded with the fixing component or the connecting component.

[0013] Furthermore, there are a plurality of elastic components, and the plurality of elastic components are arranged at intervals along the circumferential direction of the fixing structure.

[0014] Furthermore, a first limiting portion is provided on the fixed member, and a second limiting portion cooperating with the first limiting portion is provided on the connecting member, so as to prevent the connecting member from rotating relative to the fixed member through the limiting action of the first limiting portion and the second limiting portion.

[0015] Furthermore, the first limiting portion is a groove arranged on the cylindrical wall of the fixing member, and the second limiting portion is a convex portion matched with the groove on the cylindrical wall of the fixing member.

[0016] Furthermore, the connecting member includes: a connecting body, the connecting body is annular, the side of the connecting body facing the fixed member is flat, and the side of the connecting body facing the rotating member is provided with a first one-way gear; the second limiting portion is connected to the outer edge of the connecting body and extends outward radially along the connecting body.

[0017] According to another aspect of the present invention, there is provided a syringe comprising the above-mentioned one-way rotation mechanism, wherein the syringe is a pen-type syringe.

[0018] By applying the technical solution of the present invention, the elastic effect of the elastic component is utilized to connect the connecting component and the rotating component, so that the connecting component is placed in a blocking state for blocking the rotating component from rotating in a first direction or in an evasive state for allowing the rotating component to rotate in a second direction through the elastic deformation of the elastic component. This arrangement makes the elastic component simple in structure and stable and reliable in operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0020] Figure 1 A schematic diagram of the explosion structure of the first embodiment of the syringe according to the present invention is shown;

[0021] Figure 2 A schematic structural diagram of a first embodiment of a fixing member and a connecting member of a syringe according to the present invention is shown;

[0022] Figure 3 A schematic structural diagram of a first embodiment of a connecting member of a syringe according to the present invention is shown;

[0023] Figure 4 A schematic diagram of the explosion structure of the second embodiment of the syringe according to the present invention is shown;

[0024] Figure 5 It shows a structural schematic diagram of a second embodiment of a connecting member of a syringe according to the present invention;

[0025] Figure 6 A schematic cross-sectional view of an embodiment of a syringe according to the present invention is shown.

[0026] The above drawings include the following reference numerals:

[0027] 10. fixing member; 11. accommodating cavity; 12. first limiting portion;

[0028] 20. Rotating member; 21. Second one-way gear;

[0029] 30. Connecting member; 31. Connecting body; 32. Second limiting portion; 33. First one-way gear;

[0030] 40. elastic member; 41. supporting end; 42. elastic end; 43. protrusion;

[0031] 50. Screw;

[0032] 60. Piston;

[0033] 70. Push handle. DETAILED DESCRIPTION

[0034] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0035] like Figures 1 to 6 As shown, according to an embodiment of the present invention, a one-way rotation mechanism is provided.

[0036] Specifically, Figure 1 , Figure 4 and Figure 6 As shown, the one-way rotation mechanism includes a screw 50 and a piston 60 arranged at one end of the screw. The syringe also includes: a fixed component 10, a rotating component 20, a connecting component 30 and an elastic component 40. The screw is inserted into the accommodating cavity in the fixed component 10 and is threadedly connected to the fixed component 10. The screw is inserted into the rotating component 20 so that the screw 50 can rotate relative to the fixed component 10 by driving the rotating component 20 to rotate. A push handle 70 is provided on the screw 50 so that the screw 50 pushes the piston 60 to move through the push handle 70. The connecting component 30 is arranged between the fixed component 10 and the rotating component 20. A first limiting portion 12 is provided on the fixed component 10, and a second limiting portion 32 matched with the first limiting portion 12 is provided on the connecting component 30 so that the first limiting portion 12 and the second limiting portion 32 are matched. The limiting function of the second limiting portion 32 prevents the connecting member 30 from rotating relative to the fixed member 10; the connecting member 30 has a blocking state in which the rotating member 20 is blocked from rotating in the first direction, and the connecting member 30 has an avoidance state in which the rotating member 20 is rotated in the second direction. When the connecting member 30 is in the avoidance state, the connecting member 30 can rotate relative to the rotating member 20, wherein one of the first direction and the second direction is a clockwise direction, and the other of the first direction and the second direction is a counterclockwise direction. The elastic member 40 is arranged between the fixed member 10 and the connecting member 30, so that the connecting member 30 and the rotating member 20 are engaged under the action of the elastic member 40, so that the connecting member 30 is in the blocking state or in the avoidance state through the elastic deformation of the elastic member 40. In addition, the fixed member 10 is a cylindrical structure, and the rotating member 20 is a cylindrical structure. Of course, the fixed member 10 and the rotating member 20 can also be other structures.

[0037] In this embodiment, the elastic member 40 is fixedly arranged on the fixed member 10 or the connecting member 30, and the elastic effect of the elastic member is utilized to engage the connecting member 30 and the rotating member 20, so that the connecting member 30 is located in a blocking state for blocking the rotating member 20 from rotating in a first direction or in a avoiding state for allowing the rotating member 20 to rotate in a second direction through the elastic deformation of the elastic member 40. This arrangement makes the elastic member 40 simple in structure and stable and reliable in operation.

[0038] In this embodiment, a first one-way gear 33 is provided on the connecting member 30, and a second one-way gear 21 meshing with the first one-way gear 33 is provided on the rotating member 20, so that the rotating member 20 can rotate unidirectionally relative to the connecting member 30 through the action of the first one-way gear 33 and the second one-way gear 21. The connecting member 30 has a blocking state in which the first one-way gear 33 is meshed with the second one-way gear 21, and the connecting member 30 has an avoidance state in which the first one-way gear 33 and the second one-way gear 21 are disengaged from each other and the rotating member 20 is rotated in the second direction. The elastic member 40 presses the connecting member 30 to be in the blocking state through elastic force. The fixed member 10 cooperates with the first limiting portion 12 and the second limiting portion 32 to prevent the rotation of the connecting member 30. The connecting member 30 cooperates with the second one-way gear 21 through the first one-way gear 33 to prevent the rotation of the rotating member 20 in the first direction; driving the rotating member 20 to rotate in the second direction can make the first one-way gear 33 drive the second one-way gear 21 away, so that the connecting member 30 is in the avoidance state by pressing the elastic member 40, so that the rotating member 20 is driven to rotate by the external driving to rotate and the screw 50 is rotated relative to the fixed member 10, so that the screw drives the piston to move, one of the first direction and the second direction is a clockwise direction, and the other of the first direction and the second direction is a counterclockwise direction.

[0039] like Figure 1 As shown, the elastic member 40 includes a support end 41 and an elastic end 42. The support end 41 is arranged on the inner cylinder wall of the fixed member 10, and the support end 41 is extended along the axial direction of the fixed member 10. The elastic end 42 abuts against the connecting member 30. The extending direction of the elastic end 42 and the extending direction of the support end 41 have an angle, so that the elastic end 42 can effectively provide elastic force to the connecting member 30 and make the first one-way gear 33 contact the second one-way gear 21. The elastic member 40 deforms to give way to the connecting member 30 so that the rotating member 20 rotates. The elastic member 40 is arc-shaped. The arc is formed by the circumferential extension around the connecting member 30. Such an arrangement can fully extend in the fixed member 10 and provide a deformation basis for the elastic end, thereby obtaining a stable elastic force. Of course, the angle between the extending direction of the elastic end 42 and the extending direction of the support end 41 can also be zero. The inner cylinder wall includes an inner cylinder side wall and an inner cylinder bottom wall, and the support end 41 can be arranged on the inner cylinder side wall or the inner cylinder bottom wall. In addition, the elastic end 42 also includes a protrusion 43, and the protrusion 43 abuts against the connecting member 30. The protrusion abuts against the connecting member 30, so that the elastic member 40 can easily undergo elastic deformation by utilizing the height of the protrusion 43, thereby providing a stable elastic force for the connecting member 30.

[0040] In this embodiment, the connecting member 30 includes a connecting body 31, which is annular, and the side of the connecting body 31 facing the fixed member 10 is a plane, the second end of the elastic member 40 abuts against the plane, and the side of the connecting body 31 facing the rotating member 20 is provided with a first one-way gear 33, and the second limiting portion 32 is connected to the outer edge of the connecting body 31 and extends outwardly along the radial direction of the connecting body 31. When the rotating member 20 rotates clockwise, the first one-way gear 33 of the connecting member 30 is stuck with the second one-way gear 21 of the rotating member 20, and when the rotating member 20 rotates counterclockwise, due to the action of the elastic member 40, the connecting member 30 will perform regular jumping motion.

[0041] like Figure 4 and Figure 5 As shown, in the embodiment, the elastic member 40 includes a support end 41 and an elastic end 42, the support end 41 is fixedly connected to the connecting member 30, and the elastic end 42 is extended in a direction away from the connecting member 30 and abuts against the inner cylinder wall of the fixed member 10. This arrangement enables the elastic member 40 to use the reaction force of the inner cylinder wall of the fixed member 10 to apply elastic force to the connecting member 30 so that the first one-way gear 33 of the connecting member 30 is connected to the second one-way gear 21 of the rotating member 20, or the elastic member 40 is deformed to make the connecting member 30 move toward the direction of the fixed member 10 so that the rotating member 20 rotates. Among them, the elastic end 42 is arc-shaped or spiral-shaped, and this arrangement facilitates the elastic end 42 to have a stable structure in the cylindrical space of the fixed member 10 and provide a stable elastic force.

[0042] like Figure 5 As shown, the elastic end 42 further includes a protrusion 43, which abuts against the inner tube wall of the fixing member 10. The protrusion 43 abuts against the bottom wall of the inner tube wall of the fixing member 10, so that the elastic member 40 can easily deform elastically by utilizing the height of the protrusion 43, thereby providing a stable elastic force for the connecting member 30.

[0043] In addition, the outer peripheral surface of the protrusion 43 is at least a part of a spherical surface. This configuration enables the protrusion 43 to smoothly contact the connecting member 30, thereby improving the operation stability of the elastic member 40.

[0044] In this embodiment, the elastic member 40 is integrally injection molded with the fixing member 10. This arrangement improves the connection stability between the elastic member 40 and the fixing member 10, improves the reliability of the product, and reduces the production cost.

[0045] In this embodiment, the elastic member 40 and the connecting member 30 are integrally injection molded, so that the connection stability between the elastic member 40 and the connecting member 30 is improved, and the processing is convenient, the reliability of the product is improved, and the production cost is reduced.

[0046] like Figure 4 As shown, there are multiple elastic members 40, and the multiple elastic members 40 are arranged at intervals along the circumference of the fixed member 10. Such an arrangement enables the multiple elastic members 40 to apply uniform elastic force to the connecting member 30 to support the connecting member 30 and prevent the rotating member 20 from rotating, or to make the elastic members 40 give way through deformation, so that the connecting member 30 is in an evasive state, so that the rotating member 20 rotates. Preferably, there are two elastic members 40.

[0047] like Figure 2 and Figure 3 As shown, the first limiting portion 12 is a groove arranged on the wall of the fixing member 10, and the second limiting portion 32 is a convex portion matched with the groove on the wall of the fixing member 10. The convex portion and the groove are clearance matched, so that the connection member can move along the axis of the fixing member 10.

[0048] Furthermore, there are multiple first limiting portions 12, which are arranged at intervals along the circumference of the fixing member 10, and there are multiple second limiting portions 32, which are arranged at intervals along the circumference of the connecting member 30, and the multiple second limiting portions 32 are arranged one-to-one with the multiple first limiting portions 12.

[0049] In the present embodiment, a syringe is provided, comprising a screw 50, one end of which is provided with a piston 60, and the syringe further comprises: a fixed member 10, a rotating member 20, a connecting member 30 and an elastic member 40, one end of the rotating member is provided with a first connecting hole in the middle of the fixed member 10 for the screw to pass through, an end of the fixed member 10 away from the piston is provided with a receiving chamber 11, a first limiting portion 12 is provided on the cylinder wall of the fixed member 10, and the first limiting portion 12 is connected to the receiving chamber 11, the rotating member 20 is rotatably arranged in the receiving chamber 11, and the opening of the rotating member 20 toward one end of the fixed member is a waist-shaped hole for the screw to pass through. The screw passes through, and a second one-way gear 21 is provided at one end of the rotating member 20 facing the fixed member 10. The connecting member 30 is movably arranged in the accommodating cavity 11. The connecting member 30 is located between the second one-way gear 21 and the fixed member 10. A second limiting portion 32 is provided on the connecting member 30. The second limiting portion 32 is movably arranged in the first limiting portion 12 along the axial direction of the fixed member 10. A first one-way gear 33 capable of cooperating with the second one-way gear 21 is provided at one end of the connecting member 30 close to the rotating member 20. The connecting member 30 has a blocking portion that enables the first one-way gear 33 to mesh with the second one-way gear 21. The connecting member 30 has an avoidance state in which the first one-way gear 33 is separated and non-engaged from the second one-way gear 21, the elastic member 40 is arranged in the accommodating cavity 11, the first end of the elastic member 40 is connected to the fixed member 10, and the second end of the elastic member 40 is in contact with the connecting member 30, and the elastic member 40 can drive the connecting member 30 from the avoidance state to the blocking state through elastic force; wherein, when a torque is applied to the rotating member 20 along the first direction around the axis of the rotating member 20, the elastic member 40 drives the connecting member 30 to be in the blocking state, and the fixed member 10 is moved by the first limiting portion 12 and the second limiting portion 32 cooperates to prevent the rotation of the connecting member 30, and the connecting member 30 cooperates with the second one-way gear 21 through the first one-way gear 33 to prevent the rotation of the rotating member 20; when a torque is applied to the rotating member 20 along the second direction around the axis of the rotating member 20, the second one-way gear 21 drives the first one-way gear 33 away, so that the connecting member 30 is in an avoidance state by compressing the elastic member 40, and the rotating member 20 is rotated along the second direction to drive the screw to rotate, so as to drive the piston to complete the injection operation, one of the first direction and the second direction is a clockwise direction, and the other of the first direction and the second direction is a counterclockwise direction.

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A one-way rotation mechanism, the one-way rotation mechanism being used for a syringe, the one-way rotation mechanism comprising a screw (50) and a piston (60) arranged at one end of the screw (50), characterized in that: The one-way rotation mechanism further comprises: a fixed component (10), the fixed component does not move relative to the syringe housing, the screw (50) is inserted into the fixed component (10) and is threadedly connected to the fixed component (10); a rotating component (20), the screw (50) is inserted into the rotating component (20), the rotation of the rotating component (20) causes the screw (50) to rotate relative to the fixed component (10), so that the screw (50) pushes the piston (60) to move; and a connecting component (30), the connecting component ( The connecting member (30) is arranged between the fixed member (10) and the rotating member (20), and the connecting member (30) is non-rotatable relative to the fixed member (10); the connecting member (30) has a blocking state for blocking the rotating member (20) from rotating in a first direction, and the connecting member (30) has a avoiding state for allowing the rotating member (20) to rotate in a second direction, wherein one of the first direction and the second direction is a clockwise direction, and the other of the first direction and the second direction is a counterclockwise direction; an elastic member (40), the elastic member (40) being arranged between the fixing member (10) and the connecting member (30), so that the connecting member (30) is located in the blocking state or in the avoiding state through elastic deformation of the elastic member (40); The connecting member (30) is provided with a first one-way gear (33), and the rotating member (20) is provided with a second one-way gear (21) meshing with the first one-way gear (33); The elastic member (40) comprises: a supporting end (41) and an elastic end (42), wherein the supporting end (41) is arranged on the inner wall of the fixing member (10); the elastic end (42) is extended in a direction away from the fixing member (10) and abuts against the connecting member (30); or the supporting end (41) is arranged on the connecting member (30); the elastic end (42) is extended in a direction away from the connecting member (30) and abuts against the fixing member (10); the extending direction of the elastic end (42) and the extending direction of the supporting end (41) form an angle; The elastic end (42) further comprises: a protrusion (43), wherein the protrusion (43) abuts against the connecting member (30) or the fixing member (10); The elastic end (42) is arc-shaped or spiral-shaped; The outer peripheral surface of the protrusion (43) is at least a part of a spherical surface; The elastic component (40) is integrally injection-molded with the fixing component (10) or the connecting component (30); There are a plurality of elastic members (40), and the plurality of elastic members (40) are arranged at intervals along the circumference of the fixed member (10); so that the plurality of elastic members (40) can apply a uniform elastic force to the connecting member (30) to support the connecting member (30) and prevent the rotating member (20) from rotating, or make the elastic members (40) give way by deformation, so that the connecting member (30) is in an evasive state, so that the rotating member (20) rotates.

2. The one-way rotation mechanism according to claim 1, characterized in that: The fixing member (10) is provided with a first limiting portion, and the connecting member (30) is provided with a second limiting portion (32) that cooperates with the first limiting portion (12), so that the connecting member (30) is prevented from rotating relative to the fixing member (10) through the limiting action of the first limiting portion (12) and the second limiting portion (32).

3. The one-way rotation mechanism according to claim 2, characterized in that: The first limiting portion (12) is a groove arranged on the cylindrical wall of the fixing member (10), and the second limiting portion (32) is a convex portion matching the groove on the cylindrical wall of the fixing member (10).

4. The one-way rotation mechanism according to claim 2, characterized in that: The connecting member (30) comprises: a connecting body (31), the connecting body (31) is annular, the side of the connecting body (31) facing the fixed member (10) is a plane, and the side of the connecting body (31) facing the rotating member (20) is provided with the first one-way gear (33); the second limiting portion (32) is connected to the outer edge of the connecting body (31) and extends outwardly along the radial direction of the connecting body (31).

5. A syringe comprising a one-way rotation mechanism, characterized in that: The one-way rotation mechanism is the one-way rotation mechanism as claimed in any one of claims 1 to 4, wherein the syringe is a pen-type syringe.

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