Manual drug pump based on constant force spring and manual drug pump set

Abstract

The application provides a constant force spring-based manual medicine pump and a manual medicine pump set. The manual medicine pump comprises a pump body, a pushing piece and an elastic piece, the pushing piece is movably arranged in the pump body along a first direction, and the elastic piece is a constant force spiral spring; the pump body is provided with a mounting groove extending along the first direction, the mounting groove is open to a second direction, and the mounting groove is provided with a connecting part; the pushing piece is provided with a mounting recess, the mounting recess is open to the second direction, the mounting recess is communicated with the mounting groove along the second direction, and the mounting recess is provided with an abutting surface arranged in the first direction and facing away from the connecting part of the consumable; the constant force spiral spring comprises a spiral part and an extension end part extending outward from the periphery of the spiral part, the extension end part is connected with the connecting part; in a third direction, the spiral part is limited between the mounting groove and the mounting recess; and the spiral part abuts against the abutting surface. The manual medicine pump set comprises the manual medicine pump and a medicine consumable. The application can ensure the constant thrust effect of the medicine pump.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a manual drug pump and manual drug pump kit based on a constant force spring with improved installation structure. Background Technology

[0002] The existing manual drug pump includes a pump body, a pusher, and an elastic element. The pusher is movably installed in the pump body along the injection direction. The elastic element is located in the pump body as a power source and is connected between the pump body and the pusher. After the drug consumable is installed in the consumable connection part of the pump body, the restoring force of the elastic element can drive the pusher. The pusher pushes the piston of the drug consumable, thereby continuously pumping out the drug in the consumable.

[0003] In existing manual drug pumps, the elastic element is mostly a pressure spring, which is easy to install. It only requires the two ends to abut against the pump body and the pusher. However, the pressure spring cannot provide a constant force to the pusher, which will cause the drug flow rate to be unstable.

[0004] A current extraction pump utilizes a constant-force spring to provide a constant extraction force to the extractor. When using a constant-force spiral spring to provide tension to the extractor, it is only necessary to fix the constant-force spiral spring in a fixed installation space within the extraction pump and extend its extension end to pull the piston. However, this fixed installation method of the constant-force spiral spring is not suitable when it is necessary for the constant-force spiral spring to provide thrust to the drug pump and the constant-force spiral spring must not obstruct the pushing action of the pusher. Summary of the Invention

[0005] The primary objective of this invention is to provide a manual drug pump that allows a constant force spiral spring to be stably and effectively installed in the pump body to provide a constant driving force.

[0006] The second objective of this invention is to provide a manual drug pump kit that allows a constant force spiral spring to be stably and effectively installed in the pump body to provide a constant driving force.

[0007] The first objective of this invention is to provide a manual drug pump based on a constant force spring, comprising a pump body, a pusher, and an elastic element. In a first direction, one end of the pump body is a consumable connection portion. The pusher is movably disposed within the pump body along the first direction, and the elastic element is disposed between the pump body and the pusher. Under the restoring force of the elastic element, the pusher can move toward the consumable connection portion. The elastic element is a constant force spiral spring. The pump body is provided with a mounting groove extending along the first direction, the mounting groove opening in a second direction, and a connection portion disposed within the mounting groove. The pusher is provided with a mounting recess opening in the second direction and communicating with the mounting groove along the second direction. An abutment surface facing the first direction and opposite to the consumable connection portion is disposed within the mounting recess. The constant force spiral spring includes a spiral portion and an extension end extending out of the outer periphery of the spiral portion, the extension end being connected to the connection portion. In a third direction, the spiral portion is confined between the mounting groove and the mounting recess. The spiral portion abuts against the abutment surface.

[0008] As can be seen from the above scheme, the constant force scroll spring is installed between the mounting groove and the mounting recess in a manner that moves along the first direction. During the process of generating thrust by the scroll portion of the constant force scroll spring retracting relative to the extension end, the scroll portion pushes the pusher and moves along the first direction with the pusher. This arrangement allows the constant force scroll spring to be stably and effectively installed in the pump body to provide a constant thrust, and the constant force scroll spring will not obstruct the cooperation between the pusher and the drug consumable in front of the pusher. On another level, unlike the working method of the constant force scroll spring fixed in a predetermined space in the extraction pump in the prior art, the scroll portion of the constant force scroll spring in the manual drug pump of the present invention will move with the pusher. If the movement trajectory of the constant force scroll spring cannot be effectively limited, the constant force scroll spring is prone to wobbling when moving with the pusher, which will affect the constant characteristics of the output thrust and ultimately fail to achieve the constant force effect. To this end, the present invention provides a mounting groove and a mounting recess that limit the movement of the scroll portion of the constant force scroll spring in the third direction. This design can limit the movement trajectory of the scroll portion to a straight line along the first direction, preventing the constant force scroll spring from loosening or shaking during its movement and affecting the constant power output, thus ensuring the constant thrust effect of the drug pump.

[0009] A further option is to provide a mounting through hole at the extended end, and the connecting part includes a hook that passes through the mounting through hole.

[0010] As can be seen from the above, the combination of the mounting through hole and the hanging pin not only makes it easy to install the constant force scroll spring onto the pump body, but also, because the constant force scroll spring moves along the first direction, the combination of the mounting through hole and the hanging pin can also play a certain role in preventing loosening.

[0011] A further proposed solution is that the pin extends in a direction inclined to the second direction, and from the base of the pin to the tip of the pin, the pin gradually approaches the consumable connection part.

[0012] As can be seen above, the scroll section pushes the pusher downwards, while the extended end bears an upward traction force. The pin extends gradually downwards from its root to its tip. Under the upward traction force on the extended end, the inclined extended pin acts as a guide and self-locking mechanism, guiding and holding the extended end close to the pin's root. Therefore, even when the drug pump is operating and the scroll section of the constant force scroll spring continues to move, the extended end of the constant force scroll spring can maintain a good engagement with the pin, preventing loosening, resulting in better structural stability and improved product quality.

[0013] A further proposed solution is to gradually increase the cross-sectional area of ​​the nail from its base to its tip.

[0014] As can be seen from the above, this design also makes it more difficult for the hooks to detach from the mounting holes, further improving structural stability and product quality.

[0015] A further embodiment is that, in the first direction, a fastening opening is formed on the side of the hook near the consumable connection part, and the fastening opening is recessed in the hook along the first direction and in the direction away from the consumable connection part; the extended end is located at the fastening opening, and the hook restricts the extended end in the direction from the root of the hook to the top of the hook.

[0016] A further solution is to place the snap-fit ​​joint at the base of the hook.

[0017] As can be seen from the above, the design of the snap-fit ​​opening further limits the snap-fit ​​position of the extension end and the hook to the root of the hook. The extension end of the constant force scroll spring cannot leave the root of the hook before it comes out of the snap-fit ​​opening. Therefore, the constant force scroll spring and the pump body can maintain a good connection, thereby better resisting the force caused by the continuous movement of the scroll and preventing loosening.

[0018] A further embodiment is that the hook has a staggered part and an extension section connected in sequence. The staggered part is located at the root of the hook and is staggered relative to the extension section in a first direction and in a direction away from the consumable connection part. In the first direction, a snap-fit ​​opening is formed on the side of the staggered part near the consumable connection part, and a protrusion is formed on the side of the staggered part away from the consumable connection part. The protrusion protrudes from the outer peripheral surface of the extension section. The staggered part cooperates with the mounting through hole.

[0019] As can be seen from the above, if the snap-fit ​​opening is formed by reducing the cross-sectional area of ​​the hook, the cross-sectional area at the snap-fit ​​opening will be reduced, and the extension end of the constant force spiral spring snapped at that point will easily loosen, increasing the risk of disengagement. Therefore, this invention provides a misalignment portion. This misalignment portion, while forming the snap-fit ​​opening, ensures that the cross-sectional area at the snap-fit ​​point is maintained, guaranteeing that the extension end is snapped onto the hook in a relatively secure rather than loose state.

[0020] A further embodiment is that the pump body includes an inner shell and an outer shell; the pusher and the constant force spiral spring are disposed inside the inner shell and connected to the inner shell, and the consumable connection part is disposed on the outer shell; the outer shell is fitted around the outer periphery of the inner shell, and the inner shell and the outer shell are threaded together in a first direction.

[0021] As can be seen from the above, this design makes the pump body adjustable, allowing the pump body length to be adjusted according to the model of the drug consumables, the magnitude of the driving force, etc.

[0022] A further proposed solution is that the inner shell comprises two detachably connected semi-shells along the second direction; each semi-shell is provided with a mounting groove and a connecting part, and each semi-shell is connected to at least one constant force spiral spring.

[0023] As can be seen from the above, since the pump body includes a threaded inner shell and an outer shell, with the outer shell fitted over the inner shell, the inner shell is designed as two half-shells, which is very beneficial for installing the internal constant force spiral spring. Furthermore, the outer shell can be fastened from the outer periphery of the inner shell to maintain the installation structure of the inner shell. Therefore, this design facilitates product assembly and makes the product structure more compact and stable.

[0024] The second objective of this invention is to provide a manual drug pump kit that includes a manual drug pump and drug consumables; the manual drug pump is the aforementioned manual drug pump based on a constant force spring; the drug consumables and the consumable connection part are detachably connected by a snap-lock structure. Attached Figure Description

[0025] Figure 1 This is a structural diagram of an embodiment of the manual drug pump kit of the present invention.

[0026] Figure 2 This is an exploded view of an embodiment of the manual drug pump kit of the present invention.

[0027] Figure 3 This is an exploded view of the first structure of an embodiment of the manual drug pump of the present invention.

[0028] Figure 4 This is a second exploded view of an embodiment of the manual drug pump of the present invention.

[0029] Figure 5 This is a structural diagram of the half-shell in an embodiment of the manual drug pump of the present invention.

[0030] Figure 6 This is a structural diagram of the actuator in an embodiment of the manual drug pump of the present invention.

[0031] Figure 7 This is a cross-sectional view of an embodiment of the manual drug pump of the present invention.

[0032] Figure 8 for Figure 7 Enlarged view of point A in the middle. Detailed Implementation

[0033] See Figure 1 and Figure 2 The manual medication pump kit of this embodiment includes a manual medication pump 91 and a medication consumable 92. One end of the manual medication pump 91 in the length direction is provided with a consumable mounting part 110, which is the z-axis direction shown in the figure. Two symmetrical buckles 111 are provided on the outer periphery of the consumable mounting part 110. The medication consumable 92 includes a syringe and medication inside the syringe. Two symmetrically arranged and outwardly extending tabs 921 are provided on the outer periphery of the syringe, so that the tabs 921 and the buckles 111 are offset circumferentially, and the manual medication pump 91 and the medication consumable 92 are aligned along the z-axis. When the tabs 921 reach the side of the buckles 111, rotating the medication consumable 92 allows the tabs 921 to engage in the locking groove 1110 of the buckles 111. At this time, the L-shaped buckles 111 not only prevent the tabs 921 from continuing to advance in the rotational direction, but also prevent the tabs 921 from disengaging in the z-axis direction. In addition, the lug 921 is provided with a locking recess 9211, and the locking groove 1110 is provided with a locking protrusion (not shown in the figure). The locking recess 9211 and the locking protrusion engage to make the buckle 111 and the lug 921 more securely fastened, further preventing loosening. In the figure, the z-axis direction is the first direction of the present invention.

[0034] See Figures 1 to 3 The manual drug pump 91 includes a pump body 1, which includes an inner shell 12 and an outer shell 11. A consumable connection part 110 and a screw 111 are provided on the outer shell 11. The outer shell 11 is fitted around the outer periphery of the inner shell 12. The outer periphery of the inner shell 12 is provided with an external thread 129, and the inner periphery of the outer shell 11 is provided with an internal thread 119. The external thread 129 and the internal thread 119 are threadedly engaged in the z-axis direction, that is, the inner shell 12 and the outer shell 11 can move relative to each other in the z-axis direction through the threaded engagement.

[0035] See Figure 4 and Figure 7 The inner shell 12 includes two half-shells 121 detachably connected along the x-axis direction, which is the second direction of the present invention. The manual drug pump 91 also includes a pusher 2 and a constant force spiral spring 3 installed inside the inner shell 12. The pusher 2 is connected between the two half-shells 121, and a constant force spiral spring 3 is connected to each half-shell 121.

[0036] See Figure 4 and Figure 5The cavity of the half-shell 121 is provided with two first protrusions 123 that protrude from the inner wall surface 122. Both first protrusions 123 extend along the z-axis between the upper and lower ends of the half-shell 121. The two first protrusions 123 protrude from the inner surface 122 along the x-axis. In the y-axis direction, there is a gap between the two first protrusions 123. The y-axis direction is the third direction of the present invention. This gap forms the mounting groove 124 of the present invention. The mounting groove 124 is open in the x-axis direction and towards the other half-shell 121.

[0037] Combined Figure 7 and Figure 8 A hook 13 is provided at the lower part of the mounting groove 124. The hook 13 is used to fix the constant force spiral spring 3. The hook 13 protrudes from the inner wall surface 122. The part of the hook 13 that connects to the inner wall surface 122 is the root of the hook 13, and the part of the hook 13 that connects away from the inner wall surface 122 is the top of the hook 13. Figure 8 As shown, the pin 13 extends in a direction inclined to the x-axis, and from the root of the pin 13 to the top of the pin 13, the pin 13 gradually approaches the consumable connection part 110, and from the root of the pin 13 to the top of the pin 13, the cross-sectional area of ​​the pin 13 gradually increases.

[0038] Additionally, the hook 13 is provided with a misaligned portion 131 and an extension section 132 connected in sequence. The misaligned portion 131 is located at the root of the hook 13 and is misaligned relative to the extension section 132 along the positive z-axis. In the z-axis direction, a snap-fit ​​opening 1311 is formed on the side of the misaligned portion 131 near the consumable connection portion 110, and a protrusion 1312 is formed on the side of the misaligned portion 131 opposite to the consumable connection portion 110. The protrusion 1312 protrudes from the outer peripheral surface of the extension section 132. See also Figure 8 The constant force spiral spring 3 includes a spiral portion 32 and an extension end 31 extending out of the outer periphery of the spiral portion 32. The extension end 31 is provided with a mounting through hole 310, through which the hanging pin 13 passes.

[0039] See Figure 6To ensure that the pushing member 2 can slide with the two half-shells 121 to move up and down in the z-axis direction, and to ensure that the pushing member 2 can abut against the constant force spiral spring 3 while restricting the constant force spiral spring 3 in the y-axis direction, the pushing member 2 is provided with two mounting recesses 210 arranged opposite each other in the x-axis direction. The mounting recesses 210 open on one side in the x-axis direction and one side in the z-axis direction. Two baffles 223 on the pushing member 2 block the mounting recesses 210 from opposite directions in the y-axis direction. The abutment surface 211 of the present invention blocks the mounting recesses 210 from the negative z-axis direction. In addition, two second protrusions 221 extend from the two baffles 223. The second protrusions 221 extend from the outer side of the baffles 223 along the x-axis direction and extend along the z-axis direction. A sliding fit position 222 is formed on one side of the second protrusions 221. In addition, a clearance groove 230 is provided at the end of the pushing member 2 in the x-axis direction.

[0040] Combined Figure 7 and Figure 8 When the pusher 2 is installed between the two half-shells 121, the two first protrusions 123 are located at the two sliding fit positions 222, and the two second protrusions 221 are located outside the two first protrusions 123, thereby forming a sliding fit in the z-axis direction between the pusher 2 and the half-shells 121. The clearance groove 230 can avoid the protruding hanging pins 13.

[0041] More importantly, this arrangement allows the mounting recess 210 and the mounting groove 124 to communicate along the second direction. When the constant force spiral spring 3 is installed inside the inner shell 12, the spiral portion 32 accommodating the constant force spiral spring 3 is located within the space formed by the connection between the mounting recess 210 and the mounting groove 124. The two first protrusions 123 can restrict the extended end 31 and a portion of the spiral portion 32 located within the mounting groove 124 from opposite sides in the y-axis direction. The other portion of the spiral portion 32 located within the mounting recess 210 is restricted by two baffle portions 223 from opposite sides in the y-axis direction. The spiral portion 32 abuts against the abutment surface 211. Under the restoring force of the constant force spiral spring 3, the region of the spiral portion 32 retracts and pushes the pusher 2 forward along the negative z-axis closer to the consumable connection portion 110. At the same time, the spiral portion 32 also moves along the negative z-axis as the pusher 2 moves.

[0042] The constant force scroll spring 3 is installed between the mounting groove 124 and the mounting recess 210 in a manner that moves along the z-axis. During the process of generating thrust by the scroll portion 32 of the constant force scroll spring 3 winding relative to the extension end 31, the scroll portion 32 pushes the pusher 2 and moves along the z-axis with the pusher. This arrangement allows the constant force scroll spring 3 to be stably and effectively installed in the pump body 1 to provide a constant thrust, and the constant force scroll spring 3 will not obstruct the cooperation between the pusher 2 and the drug consumable 92 in front of the pusher 2.

[0043] More importantly, this invention not only provides an installation structure to solve the problem of how to apply the constant force scroll spring 3 to a thrust drug pump, but also further solves the problem of the motion stability of the constant force scroll spring 3. Unlike the working method of the constant force scroll spring 3 fixed in a predetermined space in the extraction pump in the prior art, in the manual drug pump of this invention, the scroll portion 32 of the constant force scroll spring 3 will move with the pusher 2. If the motion trajectory of the constant force scroll spring 3 cannot be effectively limited, the constant force scroll spring 3 is prone to shaking when moving with the pusher 2, which will affect the constant characteristic of the output thrust and ultimately fail to achieve the constant force effect. To this end, the present invention provides an installation groove 124 in the inner shell 12 and an installation recess 210 on the pusher 2. The first protrusions 123 on both sides of the installation groove 124 and the baffles 223 on both sides of the installation recess 210 limit the spiral part 32 of the constant force spiral spring 3 in the y-axis direction. This setting can limit the movement trajectory of the spiral part 32 to a straight line along the z-axis direction, and avoid the constant force spiral spring 3 from loosening or shaking during the movement, which would affect the constant power output. Therefore, it can ensure the constant thrust effect of the drug pump.

[0044] Finally, it should be emphasized that 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 can have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A manual drug pump based on a constant force spring, comprising a pump body, a pusher, and an elastic element, wherein, in a first direction, one end of the pump body is a consumable connection portion; the pusher is movably disposed in the pump body along the first direction, and the elastic element is disposed between the pump body and the pusher; under the restoring force of the elastic element, the pusher can move toward the consumable connection portion. Its features are: The elastic element is a constant force spiral spring; The pump body is provided with a mounting groove extending along the first direction, the mounting groove is open in the second direction, and a connecting part is provided in the mounting groove; The pusher is provided with a mounting recess, which opens in the second direction and communicates with the mounting groove in the second direction. The mounting recess is provided with an abutting surface that faces the first direction and is opposite to the consumable connection part. The constant force spiral spring includes a spiral portion and an extended end extending from the outer periphery of the spiral portion, the extended end being connected to the connecting portion; in the third direction, the spiral portion is confined between the mounting groove and the mounting recess; the spiral portion abuts against the abutting surface; The inner wall of the pump body is provided with two raised first ridges, and there is a gap between the two first ridges, which forms the mounting groove; The pusher is provided with two baffles, which block the mounting recess from opposite sides in the third direction. The extended end is provided with a mounting through hole, and the connecting part includes a hook that passes through the mounting through hole. In the first direction, a fastening opening is formed on the side of the hook near the consumable connection part, and the fastening opening is recessed into the hook along the first direction and in a direction away from the consumable connection part; The extended end is located at the fastening opening, in the direction from the base of the hook to the tip of the hook, and the hook restricts the extended end; The fastening opening is located at the base of the hook; The hook has a staggered part and an extension section connected in sequence. The staggered part is located at the root of the hook and is staggered relative to the extension section along the first direction and in a direction away from the consumable connection part. In the first direction, the fastening opening is formed on the side of the misaligned portion near the consumable connection portion, and a protrusion is formed on the side of the misaligned portion opposite to the consumable connection portion, the protrusion protruding from the outer peripheral surface of the extension section; The misaligned portion mates with the mounting through hole.

2. The manual drug pump based on a constant force spring according to claim 1, characterized in that: The hook extends in a direction inclined to the second direction, and from the root of the hook to the tip of the hook, the hook gradually approaches the consumable connection part.

3. The manual drug pump based on a constant force spring according to claim 2, characterized in that: The cross-sectional area of ​​the hook gradually increases from its base to its tip.

4. The manual drug pump based on a constant force spring according to any one of claims 1 to 3, characterized in that: The pump body includes an inner shell and an outer shell; The pusher and the constant force spiral spring are disposed inside the inner shell and connected to the inner shell; The consumable connection part is disposed on the outer shell; The outer shell is fitted onto the outer periphery of the inner shell, and the inner shell and the outer shell are threaded together along the first direction.

5. The manual drug pump based on a constant force spring according to claim 4, characterized in that: The inner shell includes two half-shells that are detachably connected along the second direction; Each of the said half-shells is provided with the mounting groove and the connecting part, and each of the said half-shells is connected to at least one of the said constant force spiral springs.

6. Manual medication pump kit, including a manual medication pump and medication supplies; Its features are: The manual drug pump is the manual drug pump based on a constant force spring as described in any one of claims 1 to 5; The drug consumable and the consumable connection part are detachably connected by a snap-lock structure.

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