Fluid delivery devices and methods of use

Abstract

A fluid delivery device (1), comprising: a housing (10) provided with a mounting port (101), the housing (10) being internally provided with an accommodating cavity (102), the mounting port (101) communicating with the accommodating cavity (102); the cartridge cylinder (20) is inserted into the mounting opening (101) and detachably mounted in the accommodating cavity (102), and the cartridge cylinder (20) can slide between a first axial position and a second axial position in the accommodating cavity (102) in the axial direction; a trigger device (30) provided on the housing (10) and operably connected with the cartridge (20); wherein the triggering device (30) can drive the cartridge (20) to slide from a first axial position to a second axial position, and the cartridge (20) gradually enters the containing cavity (102) as the cartridge (20) slides from the first axial position to the second axial position. By means of the fluid delivery device (1) and the method of use thereof, it is possible to precisely deliver and dispense different volumes of fluid required for surgery to a target location, preventing accidental delivery of large volumes of fluid to the target location.

Description

Fluid delivery devices and methods of use Technical Field

[0001] The present application relates to the field of surgical tools, and more particularly to a fluid delivery device and a method of using the same. Background Art

[0002] In surgical operations, it is often necessary to use a fluid delivery device to deliver a fixed volume of fluid (e.g., a medical solution) to a target location (e.g., a lesion in the human body). Common fluid delivery devices are generally disposable devices, and such devices have a predetermined volume, so they can only deliver a predetermined volume of fluid at a time. If the required volume of fluid to be delivered is less than the predetermined volume, fluid may be wasted, increasing surgical costs. Therefore, common disposable fluid delivery devices often have a smaller predetermined volume. If the required volume of fluid is greater than the predetermined volume, multiple fluid delivery devices may be used, which can lead to unnecessary waste and increase surgical costs.

[0003] Furthermore, with disposable devices, users are unable to precisely control the volume of fluid delivered and dispensed to a target site. Although fluid delivery devices including syringes have been proposed to allow users to control the volume of fluid dispensed, such syringe-containing devices do not allow users to dispense fluid at a uniform rate. Furthermore, if the syringe "slips," a large amount of fluid may be accidentally delivered to the target site.

[0004] Summary of the Invention

[0005] Based on this, it is necessary to provide a fluid delivery device and a method of use thereof to address the above-mentioned technical problems. Through this fluid delivery device and its method of use, different volumes of fluid required for surgery can be accurately delivered and distributed to the target location, and a large amount of fluid can be prevented from being accidentally delivered to the target location.

[0006] According to one aspect of the present application, a fluid delivery device is provided, comprising: a housing, the housing having a mounting port, an interior of the housing having a housing cavity, the mounting port being in communication with the housing cavity; a cartridge, the cartridge being inserted into the mounting port and being removably mounted in the housing cavity, and the cartridge being capable of sliding in the housing cavity between a first axial position and a second axial position along an axial direction; and a triggering device, the triggering device being disposed on the housing and operably connected to the cartridge. The triggering device is capable of driving the cartridge to slide from the first axial position to the second axial position. As the cartridge slides from the first axial position to the second axial position, the cartridge gradually enters the housing cavity.

[0007] In the fluid delivery device provided in an embodiment of the present application, a triggering mechanism drives the cartridge to slide from a first axial position to a second axial position, thereby gradually distributing the fluid at a uniform flow rate. This allows for the precise delivery and distribution of different volumes of fluid required for surgery to the target location, while also preventing the accidental delivery of large amounts of fluid to the target location. When the cartridge reaches the second axial position, the liquid medicine in the cartridge is completely dispensed. Continued distribution of the liquid medicine can be achieved by replacing the cartridge.

[0008] In one embodiment, the fluid delivery device further comprises an end cap connected to the mounting port. The end cap comprises: a through hole, into which the cartridge is inserted and detachably mounted in the accommodating cavity, and the cartridge is capable of rotating between a first rotational position and a second rotational position; and a first protrusion, which protrudes from the inner wall of the through hole. The cartridge comprises: a first groove, which is provided on the outer wall of the cartridge and extends in the axial direction, and in which the second protrusion is provided; and a second groove, which is provided on the outer wall of the cartridge and extends parallel to the first groove. The first protrusion is capable of sliding along the first groove or the second groove. When the cartridge is in the first rotational position, the first protrusion is located in the first groove. When the cartridge is in the second rotational position, the first protrusion is located in the second groove.

[0009] In one embodiment, when the cartridge is inserted into the through hole at the first rotational position and slides in the direction of entering the accommodating cavity until the first protrusion abuts the second protrusion, the cartridge reaches the first axial position. When the cartridge is in the first axial position and the first rotational position, the cartridge is rotated and enters the second rotational position, and the cartridge is operably connected to the trigger device.

[0010] In one embodiment, when the cartridge is in the second axial position and the second rotational position, the cartridge is rotated so that the cartridge enters the first rotational position and the cartridge is disconnected from the operative connection with the triggering mechanism.

[0011] In one embodiment, a first step surface is provided at one end of the first protrusion facing the installation opening, and a second step surface is provided at one end of the second protrusion facing the second axial position, wherein the second step surface is adapted to abut against the first step surface.

[0012] In one embodiment, the first protrusion has a first inclined surface at one end facing the accommodating cavity, and the second protrusion has a second inclined surface at one end facing away from the second axial position. The second inclined surface is adapted to cooperate with the first inclined surface to bias the first protrusion to release the second protrusion.

[0013] In one embodiment, the first protrusion is provided with an avoidance groove. When the cartridge slides in the direction of leaving the accommodating cavity until the second protrusion contacts the first protrusion, the second protrusion biases the first protrusion toward the avoidance groove, and the first protrusion avoids the second protrusion, so that the first protrusion releases the second protrusion.

[0014] In one embodiment, the fluid delivery device further comprises a first restoration element, which is disposed in the accommodating cavity and abuts against one end of the cartridge, and biases the cartridge toward a direction of leaving the accommodating cavity.

[0015] In one embodiment, the fluid delivery device further comprises a sliding frame disposed in the accommodating chamber, one end of the sliding frame abuts against the cartridge, and the other end of the sliding frame abuts against a first restoring member, the first restoring member biasing the sliding frame toward the cartridge.

[0016] In one embodiment, the sliding frame is provided with a third protrusion, the housing is provided with a through slot, the through slot extends in the axial direction, and the third protrusion passes through the through slot and slides along the through slot.

[0017] In one embodiment, the inner wall of the through hole of the end cap is provided with at least one first limiting portion, and the outer wall of the cartridge is provided with at least one second limiting portion. When the first limiting portion and the second limiting portion are aligned in the axial direction, the cartridge can be inserted into the through hole in the first rotational position.

[0018] In one embodiment, an inner wall of the through hole is further provided with an accommodating portion, and the accommodating portion is used to accommodate the second limiting portion.

[0019] In one embodiment, the first limiting portion is a concave portion, and the second limiting portion is a convex portion. When the convex portion and the concave portion are aligned in the axial direction, the convex portion can enter the concave portion.

[0020] In one embodiment, the cartridge further comprises a rack which is arranged on the outer wall of the cartridge and extends in the axial direction. A gear set is arranged in the accommodating cavity. The cartridge is operably connected to the trigger device through the cooperation between the rack and the gear set.

[0021] According to another aspect of the present application, a method is provided for using the fluid delivery device in the aforementioned embodiment, the method comprising:

[0022] inserting the cartridge into the through hole of the end cap in a first rotational position and aligning the first groove with the first through hole;

[0023] Pushing the cartridge toward the direction of entering the through hole until the first protrusion abuts against the second protrusion and the cartridge reaches a first axial position;

[0024] rotating the cartridge to a second rotational position where the cartridge is operatively coupled to the trigger mechanism;

[0025] operating the trigger mechanism to drive the cartridge to slide toward the second axial position;

[0026] When the cartridge reaches the second axial position, the cartridge is rotated so that the cartridge enters the first rotational position and the cartridge is disconnected from the triggering device;

[0027] The first restoring member pushes the cartridge to slide in a direction away from the accommodating cavity to a first axial position, and the first protrusion contacts the second protrusion;

[0028] The second inclined surface biases the first inclined surface, causing the first protrusion to release the second protrusion, and the cartridge continues to slide in the direction of leaving the accommodating chamber until it completely leaves the accommodating chamber.

[0029] In one embodiment, before inserting the cartridge into the through hole of the end cap in the first rotational position and aligning the first groove with the first through hole, the method further comprises:

[0030] Align the first limiting portion and the second limiting portion in the axial direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The above and other objects, features and advantages of the present application will become more apparent through a more detailed description of the preferred embodiments of the present application shown in the accompanying drawings. Like reference numerals indicate like parts throughout the drawings, and the drawings are not intentionally drawn to scale with actual size, with the emphasis on illustrating the subject matter of the present application.

[0032] Other features, objects and advantages of the present application will become more apparent upon reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0033] FIG1 is a schematic partial exploded view of a fluid delivery device according to one embodiment of the present application, wherein a portion of the housing is omitted;

[0034] FIG2 is a schematic perspective view of the fluid delivery device shown in FIG1 ;

[0035] FIG3 is a schematic perspective view of a cartridge according to one embodiment of the present application;

[0036] FIG4 is another schematic perspective view of the cartridge shown in FIG3 ;

[0037] 5 is a schematic side view of a fluid delivery device according to one embodiment of the present application, with portions of the housing omitted, and illustrating the cartridge in a first axial position and a second axial position, respectively;

[0038] FIG6 is a schematic perspective view of an end cap according to one embodiment of the present application;

[0039] 7 is a schematic rear view of a fluid delivery device according to one embodiment of the present application, showing the cartridge in a first rotational position and a second rotational position, respectively;

[0040] FIG8 is a schematic cross-sectional view of a cartridge and an end cap according to one embodiment of the present application, wherein a portion of the end cap is omitted;

[0041] FIG9 is a partial enlarged view of portion A in FIG8 ;

[0042] FIG10 is a schematic perspective view of a sliding frame according to one embodiment of the present application;

[0043] FIG11 is a schematic perspective view of a fluid delivery device according to one embodiment of the present application, wherein the cartridge and other components are omitted;

[0044] FIG12 is a schematic structural diagram of a cartridge and an end cap according to one embodiment of the present application;

[0045] FIG13 is a schematic structural diagram of a cartridge and an end cap according to one embodiment of the present application;

[0046] FIG14 is a schematic structural diagram of a cartridge and an end cap according to one embodiment of the present application;

[0047] FIG15 is a schematic structural diagram of a cartridge, a trigger device, and a gear set according to one embodiment of the present application;

[0048] FIG16 is a schematic exploded view of a cartridge, a trigger mechanism, and a gear train according to one embodiment of the present application; and

[0049] FIG. 17 is a schematic exploded view of a cartridge, a trigger mechanism, and a gear train according to one embodiment of the present application. DETAILED DESCRIPTION

[0050] To facilitate understanding of the present application, a more comprehensive description of the present application will be provided below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of the present application. However, the present application may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the present disclosure.

[0051] It should be noted that when an element is considered to be "connected" to another element, it may be directly connected to the other element and integrated therewith, or there may be an intermediate element. The terms "mounted", "one end", "the other end" and similar expressions used herein are for illustrative purposes only.

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0053] With reference to Figures 1 and 2, in one embodiment of the present application, a fluid delivery device 1 is provided, comprising: a housing 10, a cartridge 20, a trigger mechanism 30, and an infusion tube 80. The housing 10 is provided with a mounting opening 101, and a receiving chamber 102 is provided within the housing 10. The mounting opening 101 is in communication with the receiving chamber 102. In Figures 1 and 2, a portion of the housing 10 is omitted to illustrate the components within the housing 10. The cartridge 20 is inserted into the mounting opening 101 and is removably mounted within the receiving chamber 102. The cartridge 20 is slidable along an axial direction within the receiving chamber 102 between a first axial position and a second axial position. The cartridge 20 contains a predetermined volume of liquid medicine to be dispensed to a target location (e.g., a lesion on a patient). The trigger mechanism 30 is disposed on the housing 10 and is operably connected to the cartridge 20. A user can operate the trigger mechanism 30 to drive the cartridge 20 to slide from the first axial position to the second axial position. As the cartridge 20 slides from the first axial position to the second axial position, it gradually enters the accommodating chamber 102. The infusion tube 80 is used to deliver the liquid medicine in the cartridge 20 to the target location. Optionally, the infusion tube 80 can be selected to a suitable length and inner diameter based on actual needs. In this embodiment, after the liquid medicine in the cartridge 20 has been completely dispensed to the target location, the cartridge 20 can be removed and replaced with a new one.

[0054] Referring to Figures 1 and 5, the upper figure in Figure 5 shows the cartridge 20 in a first axial position, at which point the cartridge 20 has just been inserted into the mounting port 101 and the fluid delivery device 1 has not yet begun to dispense the liquid medicine in the cartridge 20 to the target location. The lower figure in Figure 5 shows the cartridge 20 in a second axial position, at which point the liquid medicine in the cartridge 20 has been completely dispensed to the target location. The cartridge 20 has a stroke T between the first and second axial positions. Those skilled in the art will understand that the stroke T is related to the volume of the cartridge 20. Generally, a cartridge with a larger volume has a larger stroke T, and vice versa. Optionally, the stroke T is 27 mm.

[0055] Referring to Figures 1 and 2, in one embodiment, the fluid delivery device 1 further includes an end cap 40 connected to the mounting port 101. The end cap 40 includes a through-hole 401 and a first protrusion 402. The cartridge 20 is inserted through the through-hole 401 to be removably mounted within the accommodating chamber 102. The cartridge 20 is rotatable between a first rotational position and a second rotational position. The first protrusion 402 protrudes from the inner wall of the through-hole 401. In this embodiment, the cartridge 20 includes a first groove 201 and a second groove 203. The first groove 201 is provided on the outer wall of the cartridge 20 and extends in the axial direction. The second protrusion 202 is provided in the first groove 201. The second groove 203 is provided on the outer wall of the cartridge 20 and extends parallel to the first groove 201. The first protrusion 402 is slidable along the first groove 201 or the second groove 203. When the cartridge 20 is in the first rotational position, the first protrusion 402 is located in the first groove 201. When the cartridge 20 is located at the second rotational position, the first protrusion 402 is located in the second groove 203 .

[0056] Referring to Figures 3 and 4 , in one embodiment, the cartridge 20 further includes an operating portion 206. The user operates the operating portion 206 to insert the cartridge 20 into the through-hole 401 and switch the cartridge 20 between a first rotational position and a second rotational position. In this embodiment, the operating portion 206 is in the form of a sheet. Those skilled in the art will appreciate that the operating portion 206 can also have other suitable shapes, such as a rod or a sphere, depending on the intended use, and this application is not limited thereto. Referring to Figures 2 , 3 , and 7 , the left image of Figure 7 shows the cartridge 20 in the first rotational position, and the right image of Figure 7 shows the cartridge 20 in the second rotational position. In this embodiment, when the cartridge 20 is in the first rotational position, the angle between the operating portion 206 and the horizontal is α. When the cartridge 20 is in the second rotational position, the angle between the operating portion 206 and the horizontal is β. The cartridge 20 rotates along the direction D3 from the first rotational position to the second rotational position. Optionally, α is 45°. Optionally, β is 90°. In this embodiment, the user first inserts the cartridge 20 into the through-hole 401 in the first rotational position by operating the operating portion 206. The user then pushes the cartridge 20 toward the second axial position. When the first protrusion 402 abuts the second protrusion 202, the cartridge 20 reaches the first axial position. At this point, the abutment between the first protrusion 402 and the second protrusion 202 restricts the cartridge 20 from sliding toward the second axial position. By rotating the cartridge 20 using the operating portion 206 (e.g., rotating the cartridge 20 in the direction D3), the cartridge 20 enters the second rotational position. The first protrusion 402 and the second protrusion 202 no longer abut each other, and the cartridge 20 becomes operably connected to the trigger mechanism 30. Thereafter, the user can gradually slide the cartridge 20 toward the second axial position by operating the trigger mechanism 30, thereby gradually dispensing the liquid medicine in the cartridge 20 to the target location. When the cartridge 20 reaches the second axial position, the liquid medicine in the cartridge 20 is fully dispensed to the target location, and the cartridge 20 is now in the second rotational position. The user rotates the cartridge 20 through the operating portion 206 to bring the cartridge 20 into the first rotational position, thereby disconnecting the cartridge 20 from the operative connection with the trigger mechanism 30 , allowing the cartridge 20 to be removed from the accommodating chamber 102 and replaced with a new cartridge 20 .

[0057] 8 and 9 , in one embodiment, the end of the first protrusion 402 facing the mounting opening 101 (i.e., the right end of the first protrusion 402 in FIG. 9 ) is defined as the outer end, and the end of the first protrusion 402 facing the accommodating cavity 102 is defined as the inner end (i.e., the left end of the first protrusion 402 in FIG. 9 ). The outer end of the first protrusion 402 is provided with a first stepped surface 4021, and the end of the second protrusion 202 facing the second axial position is provided with a second stepped surface 2021, which is adapted to abut against the first stepped surface 4021. Specifically, when the cartridge 20 is inserted into the through-hole 401 and slides toward the second axial position, when the first protrusion 402 and the second protrusion 202 abut against each other, the second stepped surface 2021 abuts against the first stepped surface 4021, and the cartridge 20 reaches the first axial position. Continuing with reference to Figures 8 and 9, in this embodiment, a first inclined surface 4022 is further provided at the inner end of the first protrusion 402, and a second inclined surface 2022 is provided at the end of the second protrusion 202 facing away from the second axial position. The second inclined surface 2022 is adapted to cooperate with the first inclined surface 4022 to bias the first protrusion 402, causing the first protrusion 402 to release the second protrusion 202. In this embodiment, the first protrusion 402 is also provided with an escape groove 4023. Specifically, when the cartridge 20 slides toward the direction of exiting the accommodating cavity 102 until the first inclined surface 4022 contacts the second inclined surface 2022, the second protrusion 202 biases the first protrusion 402 toward the escape groove 4023 through the cooperation of the second inclined surface 2022 and the first inclined surface 4022, causing at least a portion of the first protrusion 402 to deform (e.g., bend) toward the escape groove 4023. Thus, the first protrusion 402 no longer blocks the second protrusion 202 , so that the first protrusion 402 releases the second protrusion 402 , which enables the cartridge 20 to continue sliding toward the direction of exiting the accommodating chamber 102 until it is completely exited from the accommodating chamber 102 .

[0058] Referring again to FIG. 5 , the fluid delivery device 1 further includes a first return member 50. The first return member 50 is disposed within the accommodating chamber 102 and abuts against one end of the cartridge 20. The first return member 50 biases the cartridge 20 toward removal from the accommodating chamber 102. In this embodiment, the first return member 50 is a spring. Those skilled in the art will appreciate that other suitable elastic devices, such as a torsion spring or a spring, may also be selected for the first return member 50, and this application is not limited thereto.

[0059] 1 , 10 , and 11 , in one embodiment, the fluid delivery device 1 further comprises a carriage 60. The carriage 60 is disposed within the accommodating chamber 102. One end of the carriage 60 abuts the cartridge 20, while the other end abuts a first return member 50 (e.g., a spring). The first return member 50 biases the carriage 60 toward the cartridge 20. Specifically, when the cartridge 20 is in the second axial position and the second rotational position, after the user rotates the cartridge 20 to the first rotational position, the first return member 50 pushes the cartridge 20 toward the accommodating chamber 102 via the carriage 60, thereby eliminating the need for the user to manually slide the cartridge 20 out of the accommodating chamber 102.

[0060] Referring to Figures 10 and 11 , in one embodiment, the carriage 60 is provided with a third protrusion 601. The housing 10 is provided with a through slot 103 extending in the axial direction. The third protrusion 601 passes through the through slot 103 and slides along it. The third protrusion 601 slides along the through slot 103, providing guidance for the carriage 60 within the accommodating chamber 102. Furthermore, the third protrusion 601 passing through the through slot 103 allows the user to observe the axial position of the third protrusion 601, thereby determining the current axial position of the carriage 60 and assessing the axial position of the cartridge 20. Optionally, the portion of the third protrusion 601 exposed outside the through slot 103 is provided with a color indicator to facilitate user observation of the axial position of the third protrusion 601.

[0061] 6 and 7 , in one embodiment, the inner wall of the through hole 401 of the end cap 40 is provided with at least one first limiting portion 4011. The outer wall of the cartridge 20 is provided with at least one second limiting portion 204. When the first limiting portion 4011 and the second limiting portion 204 are aligned axially, the cartridge 20 can be inserted into the through hole 401 in a first rotational position. In this embodiment, the first limiting portion 4011 is a recessed portion and the second limiting portion 204 is a protrusion. When the protrusion and the recessed portion are aligned axially, the protrusion can enter the recessed portion to engage therewith. The engagement of the protrusion and the recessed portion limits the rotation of the cartridge 20 around the axial direction. The inner wall of the through hole 401 is further provided with a receiving portion 4012, which is used to accommodate the protrusion. Specifically, the recessed portion has an extended length in the axial direction. When the cartridge 20 is inserted into the through hole 401 in the first rotational position (i.e., the convex portion and the concave portion are axially aligned, and the convex portion enters the concave portion) and slides toward the second axial position for a stroke exceeding the extended length, the convex portion disengages from the concave portion, at which point the convex portion enters the accommodating portion 4012, allowing the cartridge 20 to rotate axially. It should be noted that although in this embodiment, the first limiting portion 4011 is a concave portion and the second limiting portion 204 is a convex portion, this is merely exemplary. In other embodiments, the first limiting portion 4011 may be a convex portion and the second limiting portion 204 may be a concave portion.

[0062] Referring to Figures 12 to 14 , alternative embodiments of the first stopper 4011 and the second stopper 204 are shown. Comparing Figures 12 and 13 , the second stopper 204 in the embodiment shown in Figure 13 is larger than in the embodiment shown in Figure 12 . Comparing Figures 12 and 14 , the circumferential distance between the two second stoppers 204 in the embodiment shown in Figure 14 is smaller than in the embodiment shown in Figure 12 . The provision of the first stopper 4011 and the second stopper 204 achieves a foolproof installation of the cartridge 20. Specifically, when the first stopper 4011 and the second stopper 204 are axially aligned, the cartridge 20 is in the first rotational position. Only when the first stopper 4011 and the second stopper 204 are axially aligned can the cartridge 20 be inserted into the through-hole 401. This ensures that the cartridge 20 can only be inserted into the through-hole 401 in the first rotational position. Those skilled in the art will appreciate that the shapes, positions, and numbers of the first limiting portions 4011 and the second limiting portions 204 shown in Figures 12 to 14 are merely exemplary, and those skilled in the art may select any suitable shape, position, and number for the first limiting portions 4011 and the second limiting portions 204 based on actual needs. For example, in one embodiment, only one first limiting portion 4011 and one second limiting portion 204 are provided. For example, in one embodiment, three first limiting portions 4011 and three second limiting portions 204 are provided. For example, in one embodiment, the first limiting portions 4011 and the second limiting portions 204 are provided in a semicircular, triangular, or rectangular shape.

[0063] Referring to Figures 15 to 17 , in one embodiment, the cartridge 20 further includes a rack 205 . The rack 205 is disposed on the outer wall of the cartridge 20 and extends in the axial direction. A gear train 70 is disposed within the accommodating chamber 102 . The cartridge 20 is operably connected to the trigger mechanism 30 through the engagement of the rack 205 and the gear train 70 . Specifically, the trigger mechanism 30 includes a trigger pivotally mounted on the housing 10 . The gear train 70 includes a first gear 701 , a second gear 702 , and a third gear 703 . The first gear 701 is fixedly connected to the trigger's pivot axis and is capable of pivoting with the trigger. The second gear 702 is pivotally mounted within the accommodating chamber 102 and meshes with the first gear 701 . The third gear 703 is pivotally mounted within the accommodating chamber 102 and meshes with the second gear 702 and the rack 205 . When the user presses the trigger, forcing the trigger to pivot, the first gear 701 pivots along with the trigger. The trigger's pivotal motion in the direction D1 is converted into axial sliding of the cartridge 20 in the direction D2 (i.e., toward the second axial position) through the transmission of the second gear 702, the third gear 703, and the rack 205. Thus, pressing the trigger drives the cartridge 20 to slide toward the second axial position, gradually dispensing the liquid medicine in the cartridge 20 to the target location.

[0064] Referring to FIG. 16 , in one embodiment, the fluid delivery device 1 further includes a second return member 90. The second return member 90 is connected to the trigger mechanism 30 and is adapted to bias the trigger mechanism 30 toward its initial position. Optionally, the second return member 90 is a torsion spring. After the user releases the pressure on the trigger mechanism 30, the torsion spring acts to return the trigger mechanism 30 to its initial position. Optionally, the trigger mechanism 30 is connected to the first gear 701 via a one-way connection. The first gear 701 pivots with the trigger mechanism 30 only when the trigger mechanism 30 pivots in the direction D1. When the trigger mechanism 30 pivots in the direction opposite to D1 (e.g., when the trigger mechanism 30 returns to its initial position under the action of the torsion spring), the first gear 701 does not pivot with the trigger mechanism 30. Such one-way connection mechanisms are well known to those skilled in the art, such as a ratchet mechanism, and are not further described herein.

[0065] The embodiment of the present application also provides a method for using the fluid delivery device 1 in the aforementioned embodiment. The method comprises:

[0066] Step 101: Insert the cartridge 20 into the through hole 401 of the end cap 40 at a first rotational position, and align the first groove 201 with the first through hole 401;

[0067] Step 102: Push the cartridge 20 toward the direction of entering the through hole 401 until the first protrusion abuts against the second protrusion, and the cartridge 20 reaches the first axial position;

[0068] Step 103: Rotate the cartridge 20 to bring it into a second rotational position, whereby the cartridge 20 is operably connected to the trigger device 30;

[0069] Step 104: operating the trigger device 30 to drive the cartridge 20 to slide toward the second axial position;

[0070] Step 105: When the cartridge 20 reaches the second axial position, the cartridge 20 is rotated so that the cartridge 20 enters the first rotational position, and the cartridge 20 is disconnected from the triggering device 30.

[0071] Step 106: The first restoring member 50 pushes the cartridge 20 to slide in a direction away from the accommodating cavity 102 to a first axial position, and the first protrusion 402 contacts the second protrusion 202;

[0072] Step 107 : The second inclined surface 2022 biases the first inclined surface 4022 , causing the first protrusion 402 to release the second protrusion 202 , and the cartridge 20 continues to slide in the direction of leaving the accommodating cavity 102 until it completely leaves the accommodating cavity 102 .

[0073] In one embodiment, before step 101, the method further includes:

[0074] Step 100: Align the first limiting portion 4011 and the second limiting portion 204 in the axial direction.

[0075] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0076] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A fluid delivery device (1), characterized in that The fluid delivery device (1) comprises: A housing (10), wherein the housing (10) is provided with a mounting opening (101), a receiving cavity (102) is provided inside the housing (10), and the mounting opening (101) is in communication with the receiving cavity (102); a cartridge (20), the cartridge (20) being inserted into the installation opening (101) and being detachably installed in the accommodating cavity (102), and the cartridge (20) being able to slide in the accommodating cavity (102) along an axial direction between a first axial position and a second axial position; a trigger device (30), the trigger device (30) being disposed on the housing (10) and being operably connected to the cartridge (20); The trigger device (30) is capable of driving the cartridge (20) to slide from the first axial position to the second axial position. Wherein, as the cartridge (20) slides from the first axial position to the second axial position, the cartridge (20) gradually enters the accommodating cavity (102).

2. The fluid delivery device (1) according to claim 1, characterized in that The fluid delivery device (1) further comprises an end cap (40), wherein the end cap (40) is connected to the mounting port (101). The end cap (40) comprises: a through hole (401), the cartridge (20) is inserted into the through hole (401) and is detachably mounted in the accommodating chamber (102), and the cartridge (20) is rotatable between a first rotation position and a second rotation position; and a first convex portion (402), the first convex portion (402) protruding from the inner wall of the through hole (401), The cartridge (20) comprises: A first groove (201), the first groove (201) is provided on the outer wall of the cartridge (20) and extends along the axial direction, and a second protrusion (202) is provided in the first groove (201); and a second groove (203), the second groove (203) being arranged on the outer wall of the cartridge (20) and extending parallel to the first groove (201), The first protrusion (402) is capable of sliding along the first groove (201) or the second groove (203). When the cartridge (20) is located at the first rotational position, the first protrusion (402) is located in the first groove (201), When the cartridge (20) is located at the second rotational position, the first protrusion (402) is located in the second groove (203).

3. The fluid delivery device (1) according to claim 2, characterized in that When the cartridge (20) is inserted into the through hole (401) at the first rotational position and the cartridge (20) is facing the through hole (401), When the accommodating cavity (102) slides in the direction of the first protrusion (402) and the second protrusion (202), the cartridge (20) reaches the first axial position. When the cartridge (20) is in the first axial position and the first rotational position, the cartridge (20) is rotated, the cartridge (20) enters the second rotational position, and the cartridge (20) is operably connected to the trigger device (30).

4. The fluid delivery device (1) according to claim 3, characterized in that When the cartridge (20) is in the second axial position and the second rotational position, the cartridge (20) is rotated so that the cartridge (20) enters the first rotational position, and the cartridge (20) is disconnected from the operative connection with the trigger device (30).

5. The fluid delivery device (1) according to any one of claims 1 to 4, characterized in that The outer end of the first protrusion (402) is provided with a first step surface (4021), and the end of the second protrusion (202) facing the second axial position is provided with a second step surface (2021), and the second step surface (2021) is suitable for abutting against the first step surface (4021).

6. The fluid delivery device (1) according to any one of claims 1 to 4, characterized in that: The inner end of the first convex portion (402) is provided with a first inclined surface (4022) A second inclined surface (2022) is provided at one end of the second protrusion (202) away from the second axial position. The second inclined surface (2022) is suitable for cooperating with the first inclined surface (4022) to bias the first protrusion (402) to release the second protrusion (202).

7. The fluid delivery device (1) according to claim 6, characterized in that The first protrusion (402) is provided with an avoidance groove (4023). When the cartridge (20) slides in a direction to escape from the accommodating cavity (102) until the second protrusion (202) contacts the first protrusion (402), the second protrusion (202) biases the first protrusion (402) toward the avoidance groove (4023), and the first protrusion (402) avoids the second protrusion (202), so that the first protrusion (402) releases the second protrusion (402).

8. The fluid delivery device (1) according to claim 1, characterized in that The fluid delivery device (1) further comprises a first restoring member (50), which is disposed in the accommodating cavity (102) and abuts against one end of the cartridge (20), and the first restoring member (50) biases the cartridge (20) in a direction away from the accommodating cavity (102).

9. The fluid delivery device (1) according to claim 8, characterized in that The fluid delivery device (1) further comprises a sliding frame (60), wherein the sliding frame (60) is arranged in the accommodating chamber (102), one end of the sliding frame (60) abuts against the cartridge (20), and the other end of the sliding frame (60) abuts against the first restoring member (50), and the first restoring member (50) biases the sliding frame (60) toward the cartridge (20).

10. The fluid delivery device (1) according to claim 8, characterized in that The sliding frame (60) is provided with a third protrusion (601), the housing (10) is provided with a through slot (103), the through slot (103) extends in the axial direction, and the third protrusion (601) passes through the through slot (103) and slides along the through slot (103).

11. The fluid delivery device (1) according to claim 2, characterized in that The inner wall of the through hole (401) of the end cover (40) is provided with at least one first limiting portion (4011). The outer wall of the cartridge (20) is provided with at least one second limiting portion (204). When the first limiting portion (4011) and the second limiting portion (204) are aligned in the axial direction, the cartridge (20) can be inserted into the through hole (401) at the first rotational position.

12. The fluid delivery device (1) according to claim 11, characterized in that The inner wall of the through hole (401) is further provided with a receiving portion (4012), and the receiving portion (4012) is used to accommodate the second limiting portion (204).

13. The fluid delivery device (1) according to claim 12, characterized in that The first limiting portion (4011) is a concave portion, and the second limiting portion (204) is a convex portion. When the convex portion and the concave portion are aligned axially, the convex portion can enter the concave portion.

14. The fluid delivery device (1) according to claim 1, characterized in that The cartridge (20) further comprises a rack (205), wherein the rack (205) is arranged on the outer wall of the cartridge (20) and extends in the axial direction. A gear set (70) is disposed in the accommodating chamber (102), and the cartridge (20) is operably connected to the trigger device (30) through the cooperation between the rack (205) and the gear set (70).

15. A method of use for a fluid delivery device (1) according to any one of claims 1 to 14, characterized in that: The method comprises: Inserting the cartridge (20) into the through hole (401) of the end cover (40) at a first rotational position, and aligning the first groove (201) with the first through hole (401); Pushing the cartridge (20) in a direction of entering the through hole (401) until the first protrusion (402) abuts against the second protrusion (202), and the cartridge (20) reaches a first axial position; Rotating the cartridge (20) to bring the cartridge (20) into a second rotational position, wherein the cartridge (20) is operably connected to a trigger device (30); operating the trigger device (30) to drive the cartridge (20) to slide toward the second axial position; When the cartridge (20) reaches the second axial position, the cartridge (20) is rotated so that the cartridge (20) enters the first rotational position, and the cartridge (20) is disconnected from the trigger device (30). The first restoring member (50) pushes the cartridge (20) to slide in a direction away from the accommodating chamber (102) to the first axial position, and the first protrusion (402) contacts the second protrusion (202); The first inclined surface (4022) is biased by the second inclined surface (2022), and the first protrusion (402) releases the second protrusion (202), and the cartridge (20) continues to slide in the direction of disengaging from the accommodating cavity (102) until it completely disengages from the accommodating cavity (102).

16. The method of use according to claim 15, characterized in that: Before step 101, the method further includes: The first limiting portion (4011) is aligned with the second limiting portion (204) in the axial direction.

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