Magnetic bead adding device

Abstract

The utility model provides a magnetic bead adding device which is characterized in that a pen tube is detachably connected with the lower end of a pen container, a movable cylinder is movably arranged in the pen container, the upper end of the movable cylinder extends out of the upper end of the pen container, the lower end of the movable cylinder is a closed end, the movable cylinder can move between a first position and a second position, and a pen cap is arranged at the top of the movable cylinder. A movable hole is formed in the first end of the movable cylinder, the guide piece is arranged in the pen tube and provided with a first through hole communicated with the magnetic bead guide cylinder, the first end of the magnetic bead guide rod is connected with the first end of the movable cylinder, and a containing groove is formed in the second end of the magnetic bead guide rod. Due to the fact that separation and adding of the magnetic beads can be achieved through the movable cylinder, the magnetic bead guide rod, the magnetic bead guide cylinder and the guide piece, compared with an existing magnetic bead adding device, the magnetic bead adding device is simple in structure and smaller in size, operation of workers is greatly facilitated, and the use range of the magnetic bead adding device is greatly expanded.

Description

TECHNICAL FIELD

[0001] The utility model relates to medical equipment detection field, concretely is a magnetic bead adding device. BACKGROUND

[0002] The magnetic bead adding device is a device for adding magnetic beads in the blood coagulation analysis process of a blood coagulation analyzer, and the existing magnetic bead adding device is composed of a bead separation unit and a bead adding unit.

[0003] However, the existing magnetic bead adding device has a complex structure, a large volume, and limited operation and application range, which greatly affects the smooth use of the magnetic bead method in the blood coagulation analysis process. SUMMARY

[0004] Therefore, the utility model embodiment provides a magnetic bead adding device to solve the problem of the large volume of the existing magnetic bead adding device.

[0005] To achieve the above-mentioned purpose, the utility model embodiment provides the following technical scheme:

[0006] A magnetic bead adding device, comprising: a pen cap, a pen barrel, a pen tube, a movable barrel, a magnetic bead guide rod, a magnetic bead guide barrel and a guide piece;

[0007] The pen tube is detachably connected to the lower end of the pen barrel;

[0008] The movable barrel is movably arranged in the pen barrel, the upper end of the movable barrel protrudes from the upper end of the pen barrel, the lower end of the movable barrel is a closed end, and the movable barrel can move between a first position and a second position;

[0009] The pen cap is arranged on the top of the movable barrel;

[0010] The first end of the movable barrel is provided with a movable hole for the magnetic bead guide barrel to pass through, and the magnetic bead guide barrel is used for conveying magnetic beads;

[0011] The guide piece is arranged in the pen tube and is provided with a first through hole in communication with the magnetic bead guide barrel;

[0012] The first end of the magnetic bead guide rod is connected to the first end of the movable barrel;

[0013] The second end of the magnetic bead guide rod is provided with a receiving groove for receiving a single magnetic bead, when the movable cylinder is in the first position, the receiving groove is in communication with the first end of the first through hole of the guide piece; when the movable cylinder is in the second position, the receiving groove is in communication with the pen tube, and the second end of the magnetic bead guide rod limits the magnetic bead from escaping from the lower end of the first through hole of the guide piece.

[0014] Preferably, a first channel and a second channel are provided along the axial direction of the pen tube, wherein the first channel is used for receiving the guide piece, and the second channel is used for the magnetic bead to pass through.

[0015] Preferably, the second end of the magnetic bead guide rod is in a rectangular structure;

[0016] One side of the guide piece is provided with a sliding groove in sliding cooperation with the second end of the magnetic bead guide rod, wherein the lower end of the sliding groove is in communication with the second channel;

[0017] The second end of the first through hole is located at the first end of the guide piece, and the first end of the first through hole is located at the sliding groove.

[0018] Preferably, the receiving groove is provided on the side of the second end of the magnetic bead guide rod which is in contact with the bottom of the sliding groove;

[0019] The first end of the first through hole is located at the bottom of the sliding groove.

[0020] Preferably, the sliding groove comprises a first sub-sliding groove and a second sub-sliding groove, wherein the height of the first sub-sliding groove is smaller than that of the second sub-sliding groove, the first sub-sliding groove is located at the first end of the guide piece, the first end of the first through hole is located in the first sub-sliding groove, and when the movable cylinder is in the second position, the second end of the magnetic bead guide rod is located in the second sub-sliding groove.

[0021] Preferably, the lower end of the pen tube is a closed end;

[0022] The lower end of the pen tube is provided with a second through hole for the magnetic bead guide rod to pass through and a third through hole for the magnetic bead guide cylinder to pass through;

[0023] The outer wall of the lower end of the magnetic bead guide cylinder is provided with a limiting protrusion for limiting the magnetic bead guide cylinder to pass through the third through hole.

[0024] Preferably, it further comprises an elastic member;

[0025] The elastic member is arranged in the pen tube and located between the first end of the pen tube and the movable cylinder, and the elastic member can be elastically deformed when the movable cylinder is switched from the first position to the second position.

[0026] Preferably, it further comprises a connecting member;

[0027] The first end of the movable cylinder is provided with a fourth through hole for the first end of the magnetic bead guide rod to pass through;

[0028] The connecting piece is arranged in the movable cylinder and detachably connected with the first end of the magnetic bead guide rod.

[0029] Preferably, the connecting piece is a cylindrical structure.

[0030] The connecting piece is provided with a fifth through hole for the magnetic bead guide cylinder to pass through and communicate with the movable hole.

[0031] Preferably, the end of the connecting piece away from the guide piece is a bevel.

[0032] The fifth through hole is arranged along the lowest side of the height of the connecting piece.

[0033] Based on the above-mentioned magnetic bead adding device, the pen tube is detachably connected with the lower end of the pen cylinder, the movable cylinder is movably arranged in the pen cylinder, the upper end of the movable cylinder protrudes from the upper end of the pen cylinder, the lower end of the movable cylinder is a closed end, the movable cylinder is movable between the first position and the second position, the pen cap is arranged on the top of the movable cylinder, the first end of the movable cylinder is provided with a movable hole for the magnetic bead guide cylinder to pass through, the guide piece is arranged in the pen tube and provided with a first through hole communicating with the magnetic bead guide cylinder, the first end of the magnetic bead guide rod is connected with the first end of the movable cylinder, the second end of the magnetic bead guide rod is provided with a receiving groove for receiving a single magnetic bead, when the movable cylinder is in the first position, the receiving groove communicates with the first end of the first through hole of the guide piece; when the movable cylinder is in the second position, the receiving groove communicates with the pen tube, and the second end of the magnetic bead guide rod limits the magnetic bead from being taken out from the lower end of the first through hole of the guide piece. Through the above-mentioned magnetic bead adding device, since the application can realize the separation and adding of the magnetic beads through the movable cylinder, the magnetic bead guide rod, the magnetic bead guide cylinder and the guide piece, the structure of the application is simple compared with the existing magnetic bead adding device, and the volume is smaller, which greatly facilitates the operation of the staff and expands the use range. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description. Obviously, the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of the provided drawings.

[0035] Figure 1 The structure diagram of the magnetic bead adding device provided by the embodiment of the present application;

[0036] Figure 2 The exploded view of the magnetic bead adding device provided by the embodiment of the present application;

[0037] Figure 3 The assembly diagram of the connecting piece and the movable cylinder provided by the embodiment of the present application;

[0038] Figure 4 An assembly schematic view of the movable cylinder and the pen barrel is provided for the embodiment of the utility model;

[0039] Figure 5 An assembly schematic view of the pen barrel and the guide piece is provided for the embodiment of the utility model;

[0040] Figure 6 An assembly schematic view of the pen barrel and the guide piece is provided for the embodiment of the utility model;

[0041] Figure 7 A structure schematic view of the guide piece is provided for the embodiment of the utility model;

[0042] Figure 8 Another angle structure schematic view of the guide piece is provided for the embodiment of the utility model;

[0043] Figure 9 A movement direction schematic view of the internal magnetic beads when the movable cylinder in the magnetic bead adding device is in the first position is provided for the embodiment of the utility model;

[0044] Figure 10 A movement direction schematic view of the internal magnetic beads when the movable cylinder in the magnetic bead adding device is in the second position is provided for the embodiment of the utility model.

[0045] Among them, the cap 1, the pen barrel 2, the closed end 21, the pen tube 3, the first channel 31, the second channel 32, the movable cylinder 4, the movable hole 41, the fourth through hole 42, the magnetic bead guide rod 5, the storage groove 51, the magnetic bead guide cylinder 6, the limiting protrusion 61, the guide piece 7, the first through hole 71, the sliding groove 72, the first sub sliding groove 721, the second sub sliding groove 722, the elastic piece 8, the connecting piece 9, the fifth through hole 91. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0047] The utility model embodiment provides a kind of magnetic bead adding device, referring to Figures 1 to 10 , Figure 1 It is the structure schematic view of magnetic bead adding device, the magnetic bead adding device includes: cap 1, pen barrel 2, pen tube 3, movable cylinder 4, magnetic bead guide rod 5, magnetic bead guide cylinder 6 and guide piece 7;

[0048] Pen tube 3 is detachably connected with the lower end of pen barrel 2;

[0049] The movable cylinder 4 is movably arranged in the pen barrel 2, the upper end of the movable cylinder 4 protrudes from the upper end of the pen barrel 2, and the lower end of the movable cylinder 4 is a closed end 21, the movable cylinder 4 can move between a first position and a second position;

[0050] The pen cap 1 is arranged on the top of the movable cylinder 4;

[0051] The first end of the movable cylinder 4 is provided with a movable hole 41 for the magnetic bead guide cylinder 6 to pass through, and the magnetic bead guide cylinder 6 is used for conveying magnetic beads;

[0052] The guide piece 7 is arranged in the pen tube 3, and a first through hole 71 is arranged in the guide piece 7 and is in communication with the magnetic bead guide cylinder 6;

[0053] The first end of the magnetic bead guide rod 5 is connected with the first end of the movable cylinder 4;

[0054] The second end of the magnetic bead guide rod 5 is provided with a receiving groove 51 for accommodating a single magnetic bead, when the movable cylinder 4 is in the first position, the receiving groove 51 is in communication with the first end of the first through hole 71 of the guide piece 7, when the movable cylinder 4 is in the second position, the receiving groove 51 is in communication with the pen tube 3, and the second end of the magnetic bead guide rod 5 limits the magnetic bead from escaping from the lower end of the first through hole 71 of the guide piece 7.

[0055] It should be noted that when the magnetic bead adding device is used, the pen barrel 2 is in a vertical state or a certain inclined state, and at this time, the pen tube 3 is located at the lower end of the pen barrel 2.

[0056] It should be noted that a certain amount of magnetic beads can be pre-added in the movable cylinder 4, in the use process, the magnetic beads enter the first through hole 71 of the guide piece 7 through the magnetic bead guide cylinder 6 under the action of their own gravity, if the movable cylinder 4 is in the first position at this time, the magnetic beads enter the receiving groove 51 of the magnetic bead guide rod 5 under the action of their own gravity, because only a single magnetic bead can be accommodated in the receiving groove 51, therefore, in the process that the movable cylinder 4 moves from the first position to the second position, the magnetic bead guide rod 5 can only move a single magnetic bead, when the movable cylinder 4 is in the second position, at this time, because the receiving groove 51 is in communication with the pen tube 3, the magnetic beads enter the pen tube 3 under the action of their own gravity, and finally fall through the outlet of the pen tube 3.

[0057] It should be noted that the receiving groove 51 of the present application is an arc-shaped receiving groove 51, which is matched with the surface arc of the magnetic bead, therefore, when the movable cylinder 4 is in the second position, the magnetic bead can enter the pen tube 3 under the action of its own gravity.

[0058] The utility model discloses a detachable connection is seted up to the lower end of pen tube 3 and pen barrel 2, and the movable barrel 4 is movably arranged in pen barrel 2, and the upper end of movable barrel 4 projects from the upper end of pen barrel 2, and the lower end of movable barrel 4 is closed end 21, and movable barrel 4 can move between first position and second position, and the pen cap 1 is arranged at the top of movable barrel 4, and the first end of movable barrel 4 is provided with movable hole 41 for magnetic bead guide cylinder 6 to pass through, and guide piece 7 is arranged in pen tube 3, and is provided with first through hole 71 that communicates with magnetic bead guide cylinder 6, and the first end of magnetic bead guide rod 5 is connected with the first end of movable barrel 4, and the second end of magnetic bead guide rod 5 is provided with storage groove 51 for accommodating single magnetic bead, and when movable barrel 4 is at first position, storage groove 51 communicates with the first end of first through hole 71 of guide piece 7, and when movable barrel 4 is at second position, storage groove 51 communicates with pen tube 3, and the second end of magnetic bead guide rod 5 limits magnetic bead to come out from the lower end of first through hole 71 of guide piece 7. Through the magnetic bead adding device disclosed above, since the application can realize the separation and adding of magnetic beads through movable barrel 4, magnetic bead guide rod 5, magnetic bead guide cylinder 6 and guide piece 7, therefore, the structure of the application is simple compared with the prior art magnetic bead adding device, and the volume is smaller, which greatly facilitates the operation of the staff and expands its use range.

[0059] Preferably, pen barrel 2 is threadedly connected with pen tube 3.

[0060] It should be noted that pen barrel 2 and pen tube 3 can be threadedly connected, or can be connected in other ways (such as clamping, bonding, etc.), and those skilled in the art can make routine substitutions according to requirements.

[0061] Specifically, first channel 31 and second channel 32 are arranged along the axial direction of pen tube 3, wherein first channel 31 is used for accommodating guide piece 7, and second channel 32 is used for magnetic beads to pass through.

[0062] It should be noted that pen tube 3 is arranged as first channel 31 and second channel 32, and first channel 31 is arranged as a channel for accommodating guide piece 7, and second channel 32 is arranged as a channel for magnetic beads to pass through, and the specific manner can be that the diameter of first channel 31 is arranged to be larger than the diameter of second channel 32.

[0063] Preferably, a tapered transition channel is arranged between first channel 31 and second channel 32.

[0064] It should be noted that by arranging a tapered transition channel between first channel 31 and second channel 32, the magnetic beads can enter second channel 32 more smoothly when they come out of storage groove 51.

[0065] Further, the second end of magnetic bead guide rod 5 is of a rectangular structure.

[0066] The guiding piece 7 is provided with a sliding groove 72 on one side, which is in sliding fit with the second end of the magnetic bead guiding rod 5, and the lower end of the sliding groove 72 is in communication with the second channel 32.

[0067] The second end of the first through hole 71 is located at the first end of the guiding piece 7, and the first end of the first through hole 71 is located at the sliding groove 72.

[0068] It should be noted that the second end of the magnetic bead guiding rod 5 is in rectangular structure, and the sliding groove 72 in sliding fit with the second end of the magnetic bead guiding rod 5 is provided on one side of the guiding piece 7, and one end of the sliding groove 72 is in communication with the second channel 32, the second end of the first through hole 71 is located at the first end of the guiding piece 7, and the first end of the first through hole 71 is located at the sliding groove 72, so that the movable cylinder 4 can slide between the first position and the second position without rotating the first end of the magnetic bead guiding rod 5, thereby ensuring that the receiving groove 51 can always fit with the side of the sliding groove 72 where the first end of the first through hole 71 is located, so that when the movable cylinder 4 is in the first position, the receiving groove 51 can be in communication with the first end of the first through hole 71, and the magnetic beads can naturally enter the receiving groove 51 of the magnetic bead guiding rod 5 under the action of their own gravity, and when the movable cylinder 4 moves from the first position to the second position, the magnetic bead guiding rod 5 can drive a single magnetic bead to move, and when the movable cylinder 4 is in the second position, the magnetic bead can enter the pen tube 3 under the action of its own gravity, and finally fall through the outlet of the pen tube 3.

[0069] It should be noted that since the first end of the first through hole 71 of the present application is located in the sliding groove 72, and the second end of the first through hole 71 is located at the first end of the guiding piece 7, the first through hole 71 of the present application is opened at a certain inclination angle, and the first through hole 71 is such that the magnetic beads can fall from the second end of the first through hole 71 to the first end of the first through hole 71 under the action of their own gravity.

[0070] Further, the receiving groove 51 is provided on the side of the magnetic bead guiding rod 5 where the second end is in contact with the bottom of the sliding groove 72;

[0071] The first end of the first through hole 71 is located at the bottom of the sliding groove 72.

[0072] It should be noted that the receiving groove 51 is arranged on the side of the second end of the magnetic bead guide rod 5 in contact with the bottom of the sliding groove 72, and the first end of the first through hole 71 is located at the bottom of the sliding groove 72, so that the receiving groove 51 can always be in contact with the bottom surface of the sliding groove 72 during the sliding process of the movable cylinder 4 between the first position and the second position, and the receiving groove 51 can be in communication with the first end of the first through hole 71 when the movable cylinder 4 is in the first position, so that the magnetic beads can enter the receiving groove 51 of the magnetic bead guide rod 5 under the action of their own gravity, and the magnetic bead guide rod 5 can move the single magnetic bead during the movement of the movable cylinder 4 from the first position to the second position, and the magnetic bead can enter the pen tube 3 under the action of its own gravity when the movable cylinder 4 is in the second position, and finally fall through the outlet of the pen tube 3.

[0073] Specifically, the sliding groove 72 comprises a first sub-sliding groove 721 and a second sub-sliding groove 722, wherein the height of the first sub-sliding groove 721 is less than that of the second sub-sliding groove 722, the first sub-sliding groove 721 is located at the first end of the guide piece 7, and the first end of the first through hole 71 is located in the first sub-sliding groove 721, and the second end of the magnetic bead guide rod 5 is located in the second sub-sliding groove 722 when the movable cylinder 4 is in the second position.

[0074] It should be noted that since the second end of the magnetic bead guide rod 5 is located in the second sub-sliding groove 722 when the movable cylinder 4 of the present application is in the second position, the magnetic beads need to enter the second channel 32 of the pen tube 3 through the second sub-sliding groove 722, therefore, the difference between the bottom surface of the second sub-sliding groove 722 and the bottom surface of the first sub-sliding groove 721 needs to be greater than the diameter of the magnetic beads, so that the magnetic beads can smoothly enter the pen tube 3 from the second sub-sliding groove 722 after being detached from the receiving groove 51.

[0075] Specifically, the lower end of the pen barrel 2 is a closed end 21.

[0076] The lower end of the pen barrel 2 is provided with a second through hole for the magnetic bead guide rod 5 to pass through and a third through hole for the magnetic bead guide cylinder 6 to pass through.

[0077] The outer wall of the lower end of the magnetic bead guide cylinder 6 is provided with a limiting protrusion 61 for limiting the passage of the magnetic bead guide cylinder 6 through the third through hole.

[0078] It should be noted that the lower end of the pen barrel 2 is provided as a closed end 21, and the lower end of the pen barrel 2 is provided with a second through hole for the magnetic bead guide rod 5 to pass through and a third through hole for the magnetic bead guide cylinder 6 to pass through, so that the lower end of the pen barrel 2 can limit the guide piece 7 in cooperation with the pen tube 3, avoiding the movement of the guide piece 7 in the vertical direction.

[0079] And the outer wall of the lower end of the magnetic bead guide cylinder 6 is provided with a limiting protrusion 61 for limiting the magnetic bead guide cylinder 6 through the third through hole, and the magnetic bead guide cylinder 6 can be limited by the cooperation of the lower end of the pen barrel 2 and the guide 7, avoiding the vertical movement of the magnetic bead guide cylinder 6.

[0080] Specifically, the limiting protrusion 61 is a limiting ring.

[0081] It should be noted that the limiting protrusion 61 can be a limiting ring or a limiting ear, and those skilled in the art can choose according to needs.

[0082] Further, the magnetic bead adding device further comprises an elastic member 8.

[0083] The elastic member 8 is arranged in the pen barrel 2 and located between the first end of the pen barrel 2 and the movable cylinder 4, and the elastic member 8 can be elastically deformed when the movable cylinder 4 is switched from the first position to the second position.

[0084] It should be noted that by arranging the elastic member 8 in the pen barrel 2 and locating the elastic member 8 between the first end of the pen barrel 2 and the movable cylinder 4, and then pressing the movable cylinder 4 downward to make the elastic member 8 elastically deform when the movable cylinder 4 is switched from the first position to the second position, the elastic member 8 stores energy when it is deformed, and when the magnetic beads are removed from the storage groove 51, the pressing of the movable cylinder 4 is removed, and the elastic member 8 drives the movable cylinder 4 to move from the second position to the first position under the action of the elastic recovery force, that is, the storage groove 51 is in communication with the first end of the first through hole 71 at this time, preparing for the next time of adding beads.

[0085] Preferably, the elastic member 8 is a spring.

[0086] The spring is sleeved on the magnetic bead guide rod 5.

[0087] It should be noted that the elastic member 8 can be a spring or a spring sheet, and those skilled in the art can choose according to needs.

[0088] Further, the magnetic bead adding device further comprises a connecting member 9.

[0089] The first end of the movable cylinder 4 is provided with a fourth through hole 42 for the first end of the magnetic bead guide rod 5 to pass through;

[0090] The connecting member 9 is arranged in the movable cylinder 4 and detachably connected with the first end of the magnetic bead guide rod 5.

[0091] It should be noted that the first end of the movable cylinder 4 is provided with a fourth through hole 42 for the first end of the magnetic bead guide rod 5 to pass through, and the connecting member 9 is arranged in the movable cylinder 4 and detachably connected with the first end of the magnetic bead guide rod 5, which not only facilitates the assembly of the magnetic bead adding device, but also ensures the connection strength of the movable cylinder 4 and the magnetic bead guide rod 5.

[0092] Preferably, the connecting piece 9 is threadedly connected with the first end of the magnetic bead guide rod 5.

[0093] It should be noted that the connecting piece 9 and the first end of the magnetic bead guide rod 5 can be threadedly connected or clamped, and a person skilled in the art can select according to the needs.

[0094] Specifically, the connecting piece 9 is a cylindrical structure.

[0095] The connecting piece 9 is provided with a fifth through hole 91 for the magnetic bead guide cylinder 6 to pass through and communicate with the movable hole 41.

[0096] It should be noted that the connecting piece 9 is provided as a cylindrical structure, and the fifth through hole 91 for the magnetic bead guide cylinder 6 to pass through and communicate with the movable hole 41 is formed in the connecting piece 9. Through the cooperation of the magnetic bead guide cylinder 6 and the magnetic bead guide rod 5, the connecting piece 9 can be prevented from shaking in the movable cylinder 4, thereby avoiding abnormal noise during use.

[0097] It should be noted that the diameter of the connecting piece 9 is slightly smaller than the inner diameter of the movable cylinder 4, which can effectively reduce the assembly difficulty of the connecting piece 9.

[0098] Further, the end of the connecting piece 9 away from the guide 7 is beveled.

[0099] The fifth through hole 91 is formed along the lowest side of the height of the connecting piece 9.

[0100] It should be noted that the end of the connecting piece 9 away from the guide 7 is beveled, and the fifth through hole 91 is formed along the lowest side of the height of the connecting piece 9. Thus, when the pen barrel 2 is vertical or inclined, the magnetic beads in the movable cylinder 4 can enter the fifth through hole 91 along the bevel of the connecting piece 9 under the action of their own gravity, effectively avoiding the problem that the magnetic beads in the movable cylinder 4 cannot be added (i.e., the magnetic beads cannot fall from the pen tube 3 due to the inability to enter the fifth through hole 91).

[0101] The above description of the disclosed embodiments enables a person skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application should not be limited to the embodiments shown herein, but should be consistent with the widest scope of principles and novel features disclosed herein.

Claims

1. A magnetic bead adder, characterized in that, The utility model relates to a pen cap, a pen barrel, a pen tube, a movable barrel, a magnetic bead guide rod, a magnetic bead guide barrel and a guide piece. The pen tube is detachably connected with the lower end of the pen barrel. The movable barrel is movably arranged in the pen barrel, the upper end of the movable barrel protrudes from the upper end of the pen barrel, the lower end of the movable barrel is a closed end, and the movable barrel can move between a first position and a second position. The pen cap is arranged on the top of the movable barrel. The first end of the movable barrel is provided with a movable hole for the magnetic bead guide barrel to pass through, and the magnetic bead guide barrel is used for conveying magnetic beads. The guide piece is arranged in the pen tube and is provided with a first through hole in communication with the magnetic bead guide barrel. The first end of the magnetic bead guide rod is connected with the first end of the movable barrel. The second end of the magnetic bead guide rod is provided with a receiving groove for accommodating a single magnetic bead, the receiving groove is in communication with the first end of the first through hole of the guide piece when the movable barrel is in the first position, the receiving groove is in communication with the pen tube when the movable barrel is in the second position, and the second end of the magnetic bead guide rod limits the magnetic bead from escaping from the lower end of the first through hole of the guide piece. A first channel and a second channel are arranged along the axial direction of the pen tube, wherein the first channel is used for accommodating the guide piece, and the second channel is used for the magnetic beads to pass through.

2. The magnetic bead adding device according to claim 1, characterized in that, The second end of the magnetic bead guide rod is in a rectangular structure.

3. The magnetic bead adding device according to claim 2, characterized in that, One side of the guide piece is provided with a sliding groove in sliding cooperation with the second end of the magnetic bead guide rod, wherein the lower end of the sliding groove is in communication with the second channel. The second end of the first through hole is located at the first end of the guide piece, and the first end of the first through hole is located at the sliding groove. The receiving groove is arranged on the side of the second end of the magnetic bead guide rod in contact with the bottom of the sliding groove.

4. The magnetic bead adding device according to claim 3, characterized in that, The first end of the first through hole is located at the bottom of the sliding groove. The sliding groove comprises a first sub-sliding groove and a second sub-sliding groove, wherein the height of the first sub-sliding groove is less than that of the second sub-sliding groove, the first sub-sliding groove is located at the first end of the guide piece, the first end of the first through hole is located in the first sub-sliding groove, and the second end of the magnetic bead guide rod is located in the second sub-sliding groove when the movable barrel is in the second position.

5. The magnetic bead adding device according to claim 3, wherein The lower end of the pen barrel is a closed end.

6. The magnetic bead adding device according to claim 1, wherein The lower end of the pen barrel is provided with a second through hole for the magnetic bead guide rod to pass through and a third through hole for the magnetic bead guide barrel to pass through. The outer wall of the lower end of the magnetic bead guide barrel is provided with a limiting protrusion for limiting the magnetic bead guide barrel to pass through the third through hole. Further comprising:

7. The magnetic bead adding device according to claim 6, characterized in that An elastic piece; The elastic piece is arranged in the pen barrel and located between the first end of the pen barrel and the movable barrel, and the elastic piece can be elastically deformed when the movable barrel is switched from the first position to the second position. Further comprising:

8. The magnetic bead adding device according to claim 1, characterized in that, A connecting piece; The first end of the movable barrel is provided with a fourth through hole for the first end of the magnetic bead guide rod to pass through; The connecting piece is arranged in the movable barrel and detachably connected with the first end of the magnetic bead guide rod. The connecting piece is in a cylindrical structure; 9. The magnetic bead adding device according to claim 8, characterized in that, The connecting piece is provided with a fifth through hole for the magnetic bead guide barrel to pass through and in communication with the movable hole. ​ 10. The magnetic bead adding device according to claim 8, characterized in that, The end of the connecting piece away from the guide piece is beveled; The fifth through hole is formed along the lowest side of the height of the connecting piece.

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