Double-core switching mechanism and medical writing pen comprising same

Abstract

The utility model discloses a double-core switching mechanism and a medical writing pen comprising the same, the double-core switching mechanism comprises a sliding guide rail, the two sides of the sliding guide rail are provided with sliding grooves, the lower end of each sliding groove is provided with a clearance position, and the sliding guide rail is provided with a guide hole communicated with the clearance positions; the swing frame is hinged with two ejector rods, and the two ejector rods respectively penetrate through the guide holes; the number of the operating rods is two, each operating rod is connected with a refill, each operating rod is provided with a protruding block, the two operating rods are correspondingly connected to the two sliding grooves in a sliding mode, and the moving path of the operating rods intersects with the moving path of the ejector rod; the positioning plate is provided with two positioning holes, the two refills penetrate through the positioning holes respectively, the periphery of each refill is sleeved with an elastic piece, and the elastic pieces are connected between the protruding blocks and the positioning plate in a clamped mode. Compared with the prior art, due to the fact that linkage structures among all the components are arranged more reasonably, the failure rate of the refills in the action process can be effectively reduced, and the double-refill requirement of medical staff is met.

Description

Technical Field

[0001] The utility model relates to the technical field of medical instruments, in particular to a dual-core switching mechanism and a medical writing pen comprising the same. Background Art

[0002] Medical staff are busy with their daily work and need a lot of tools. In order to facilitate access, medical staff will put multi-functional medical writing pens in their pockets, which not only makes it easier to use but also saves a lot of time searching for tools.

[0003] Because medical staff need to use both red and black pens during work, some multifunctional medical writing pens have two refills, allowing medical staff to switch between refills of corresponding colors as needed. However, in practice, it has been found that existing multifunctional medical writing pens are prone to refill jams, which can prevent the refill from extending normally and making writing impossible. Therefore, most medical institutions have purchased single-refill versions with a lower failure rate. This means that medical staff need to prepare a multifunctional medical writing pen and a regular writing pen for daily work. Utility Model Content

[0004] The utility model aims to provide a dual-core switching mechanism to reduce the probability of failure of a dual-core writing pen.

[0005] According to the first embodiment of the present invention, the dual-core switching mechanism is applied to a writing pen with a pen housing, and includes:

[0006] A sliding guide rail is fixedly connected to the pen housing, and a first slide groove and a second slide groove are provided on both sides of the sliding guide rail, and a lower end of the first slide groove and a lower end of the second slide groove are provided with a clearance position. The sliding guide rail is provided with two guide holes, and the two guide holes are connected to the two clearance positions respectively.

[0007] a swing frame rotatably connected to the pen housing, the swing frame having two swing arms, the two swing arms being hingedly connected to a first push rod and a second push rod, the first push rod and the second push rod respectively passing through one of the guide holes, so that the first push rod and the second push rod respectively extend to the corresponding avoidance position;

[0008] a first operating rod connected to a first refill, the first operating rod being provided with a first protrusion and being slidably connected to the first sliding groove, wherein a moving path of the first operating rod intersects a moving path of the first ejector rod;

[0009] a second operating rod connected to a second refill, the second operating rod being provided with a second protrusion and slidably connected to the second slide groove, wherein a movement path of the second operating rod intersects a movement path of the second ejector rod;

[0010] A positioning plate is fixedly connected to the pen case, the positioning plate is located below the sliding guide rail, the positioning plate is provided with two positioning holes, the first pen core and the second pen core respectively pass through one of the positioning holes, the outer periphery of the first pen core is provided with a first elastic member, the first elastic member is clamped between the first protrusion and the positioning plate, the outer periphery of the second pen core is provided with a second elastic member, the second elastic member is clamped between the second protrusion and the positioning plate.

[0011] The dual-core switching mechanism according to the embodiment of the present invention has at least the following beneficial effects: when it is necessary to extend one of the refills, for example, to extend the first refill located on the left, the user presses the first operating lever downward to drive the first operating lever to move toward the lower end of the first slide groove; when the first operating lever moves to the corresponding avoidance position, since there is a virtual position at this position, the user can manipulate the first operating lever to press the first push rod located in the avoidance position to the right, so as to force the first push rod to move in the direction of leaving the avoidance position, thereby forcing the swing frame to rotate, and then forcing the second push rod to go deep into the corresponding avoidance position to the right; at this time, the first refill is extended out of the pen case, and the first elastic member is compressed and stores energy. Even if the user removes the force on the first operating lever, the first refill remains extended because the first operating lever is stuck in the avoidance position; when it is necessary to retract the first When refilling the pen, the user presses the second operating lever downward to drive the second operating lever to move toward the lower end of the second slide groove. When the second operating lever moves to the corresponding avoidance position, since there is a virtual position in this position, the user can control the second operating lever to press the second push rod in the avoidance position to the left, so as to force the second push rod to move in the direction of leaving the avoidance position, thereby forcing the swing frame to rotate, and then forcing the first push rod to go deeper into the corresponding avoidance position to push the first operating lever to the left and leave the avoidance position. Once the first operating lever leaves the avoidance position, the first elastic member releases the elastic force to drive the first operating lever to reset, thereby finally retracting the first pen refill. Compared with the prior art, since the linkage structure between the various components of this technology is more reasonably arranged, the failure rate of the pen refill during operation can be effectively reduced to meet the double refill needs of medical staff.

[0012] According to some embodiments of the present invention, since the writing pen is small in size and the structure inside the pen case is very compact, in order to save space, the sliding guide rail has a reserved installation position between the first slide groove and the second slide groove, and the swing frame is arranged at the installation position.

[0013] According to some embodiments of the present invention, to enhance smooth operation, the first and second chutes are collectively referred to as chutes, and a sloped surface is provided between the chutes and the corresponding clearance positions, extending downward from top to bottom toward the centerline of the sliding guide rail. The provision of the sloped surface allows the operating lever to slide naturally into the corresponding clearance position when the user presses the operating lever.

[0014] According to some embodiments of the present invention, since a compression spring can store energy when compressed, the first elastic member and the second elastic member are both compression springs.

[0015] According to the second aspect of the present invention, the medical writing pen includes a pen case and the above-mentioned dual-core switching mechanism, wherein the dual-core switching mechanism is installed inside the pen case, the lower end of the pen case is provided with a pen outlet, the first pen core and the second pen core both have a moving path passing through the pen outlet, the pen case is provided with two mutually parallel avoidance grooves, and the first operating rod and the second operating rod respectively extend from one of the avoidance grooves.

[0016] According to some embodiments of the present invention, the pen housing is connected to a pen clip, which includes a clamping body and a movable cover. The movable cover is movably connected to the clamping body. The clamping body has a receiving cavity, which is provided with a seal that can be customized with the user's name. The movable cover is used to conceal the seal. With this arrangement, medical staff can use their personalized seal by simply opening the movable cover, thus facilitating the frequent repetitive signature work involved in daily nursing work.

[0017] According to some embodiments of the present invention, the clamping body is provided with a filling hole connected to the accommodating chamber, and a sealing member is detachably connected to the filling hole. When ink is required, the sealing member is removed, and ink is then injected into the accommodating chamber through the filling hole. After filling is complete, the filling hole is sealed with the sealing member.

[0018] According to some embodiments of the present invention, in order to meet the daily nursing work of medical staff, the pen housing is provided with a pupil light at one end away from the pen outlet, and the outer surface of the pen housing is provided with a pupil comparison circle.

[0019] According to some embodiments of the present invention, in order to meet the daily nursing work of medical staff, the pen housing is provided with an illumination lamp at one end away from the pen outlet, and the outer surface of the pen housing is provided with a scale.

[0020] According to some embodiments of the present invention, the medical writing pen further includes a power supply module, which includes a control circuit, a circuit switch, a battery, and a charging port. The circuit switch and the charging port are both located on the outer surface of the pen housing, while the control circuit and the battery are both located inside the pen housing. The circuit switch is used to control the on / off state of the control circuit to turn the corresponding electrical appliance on and off. When the battery is low on power, the battery can be charged through the charging port.

[0021] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0023] Figure 1 This is a schematic diagram of the three-dimensional structure of the dual-core switching mechanism provided by an embodiment of the present utility model;

[0024] Figure 2 This is a cross-sectional view of a medical writing pen provided by an embodiment of the present utility model;

[0025] Figure 3 yes Figure 1 A partial enlarged view of the dual-core switching mechanism at position A is shown;

[0026] Figure 4 yes Figure 2 A partial enlarged view of the dual-core switching mechanism at position B is shown;

[0027] Figure 5 This is a schematic diagram of the three-dimensional structure of the medical writing pen provided by an embodiment of the utility model;

[0028] Figure 6 This is another three-dimensional structural schematic diagram of the medical writing pen provided by an embodiment of the utility model.

[0029] In the accompanying drawings: 10-dual core switching mechanism, 100-sliding guide rail, 200-swing frame, 300-first operating rod, 400-second operating rod, 500-positioning plate, 110-first slide, 120-second slide, 101-avoidance position, 102-guide hole, 240-rotating shaft, 210-swing arm, 220-first push rod, 230-second push rod, 211-pin shaft, 221-ring, 301-pressing head, 60 0-first refill, 310-first bump, 700-second refill, 410-second bump, 510-positioning hole, 610-first elastic member, 710-second elastic member, 130-inclined surface, 140-mounting position, 20-pen case, 21-pen outlet, 22-air avoidance groove, 800-pen clip, 30-pupil light, 40-pupil comparison circle, 50-lighting lamp, 60-scale, 71-circuit switch, 72-charging port. DETAILED DESCRIPTION

[0030] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0031] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0032] In the description of this utility model, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and is not to be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0033] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0034] like Figure 1 and Figure 2As shown, the dual-core switching mechanism 10 according to the first embodiment of the present invention is applied to a writing pen with a pen case 20. The dual-core switching mechanism 10 includes a sliding guide rail 100, a swing frame 200, a first operating rod 300, a second operating rod 400 and a positioning plate 500, wherein the sliding guide rail 100 and the positioning plate 500 are both fixedly connected in the pen case 20. If the pen outlet 21 of the pen case 20 is taken as the downward direction, then the positioning plate 500 is located below the sliding guide rail 100.

[0035] Specifically, the sliding rail 100 has a first slide groove 110 and a second slide groove 120 on either side thereof, which are parallel to each other. The first slide groove 110 and the second slide groove 120 both extend in the vertical direction, and a clearance position 101 is provided at the lower end of the first slide groove 110 and the lower end of the second slide groove 120. Furthermore, the sliding rail 100 has two guide holes 102, which are arranged in the left-right direction and communicate with the two clearance positions 101, respectively.

[0036] like Figure 3 and Figure 4 As shown, the swing frame 200 is rotatably connected to the pen housing 20 via a rotating shaft 240. The swing frame 200 is U-shaped and has two swing arms 210. The two swing arms 210 are respectively hinged with a first push rod 220 and a second push rod 230. In this case, each swing arm 210 is provided with a pin 211. The two push rods are each mounted on the outside of the corresponding pin 211 via a collar 221 to achieve the hinged connection between the first push rod 220 and the second push rod 230. The first push rod 220 and the second push rod 230 each pass through a guide hole 102. The direction of penetration is from between the two guide holes 102 to the corresponding clearance position 101, that is, from the inside to the outside, so that the first push rod 220 and the second push rod 230 can respectively extend into the corresponding clearance position 101.

[0037] When one of the push rods moves away from the corresponding avoidance position 101 due to external force, since the swing frame 200 is a whole, the swing frame 200 will swing toward the other avoidance position 101, and then force the other push rod to move deeper into the corresponding avoidance position 101, that is, the position of the first push rod 220 in the corresponding avoidance position 101 and the position of the second push rod 230 in the corresponding avoidance position 101 increase and decrease respectively. If any one push rod leaves the corresponding avoidance position 101, the other push rod will go deeper into the corresponding avoidance position 101.

[0038] like Figure 1 and Figure 2As shown, the first operating rod 300 and the second operating rod 400 are both provided with a pressing head 301 extending out of the pen housing 20. Since the first operating rod 300 is slidably connected to the first slide groove 110 and the second operating rod 400 is slidably connected to the second slide groove 120, the pen housing 20 is provided with two avoidance grooves 22 that match the moving paths of the two pressing heads 301, so that the user can control the position of the corresponding operating rod in the slide groove through the pressing head 301 from the outside of the pen housing 20.

[0039] The first operating rod 300 is connected to the first refill 600 and is provided with a first protrusion 310 having a larger cross-sectional area than the first refill 600. The movement path of the first operating rod 300 intersects with the movement path of the first ejector 220. In other words, the first operating rod 300 can move along the first chute 110 to the corresponding clearance position 101 and come into contact with the first ejector 220. Similarly, the second operating rod 400 is connected to the second refill 700 and is provided with a second protrusion 410 having a larger cross-sectional area than the second refill 700. The movement path of the second operating rod 400 intersects with the movement path of the second ejector 230. In other words, the second operating rod 400 can move along the second chute 120 to the corresponding clearance position 101 and come into contact with the second ejector 230.

[0040] In addition, the positioning plate 500 is provided with two positioning holes 510, and the first pen refill 600 and the second pen refill 700 respectively pass through one positioning hole 510. The outer periphery of the first pen refill 600 is provided with a first elastic member 610, and the outer dimension of the first elastic member 610 is smaller than the outer dimension of the first protrusion 310 but larger than the inner dimension of the corresponding positioning hole 510, so that the first elastic member 610 is clamped between the first protrusion 310 and the positioning plate 500; the outer periphery of the second pen refill 700 is provided with a second elastic member 710, and the outer dimension of the second elastic member 710 is smaller than the outer dimension of the second protrusion 410 but larger than the inner dimension of the corresponding positioning hole 510, so that the second elastic member 710 is clamped between the second protrusion 410 and the positioning plate 500.

[0041] It is understandable that, since compression springs can store energy when compressed, the first elastic member 610 and the second elastic member 710 can both be compression springs.

[0042] When the user presses the first operating rod 300 to move to the right, the user can press the first push rod 220 in the clearance position 101 to move the first push rod 220 away from the clearance position 101. The user can then press the first operating rod 300 to the right to push the first push rod 220 in the clearance position 101 to move the first push rod 220 away from the clearance position 101. This will force the swing frame 200 to rotate, and then force the second push rod 230 to move rightward into the corresponding clearance position 101. At this time, the first pen refill 600 is extended out of the pen case 20, and the first elastic member 610 is compressed and stores energy. Even if the user removes the force on the first operating rod 300, the first pen refill 600 remains extended because the first operating rod 300 is locked in the clearance position 101.

[0043] When the first refill 600 needs to be retracted, the user presses the pressing head 301 of the second operating rod 400 downward to drive the second operating rod 400 to move toward the lower end of the second slide groove 120. When the second operating rod 400 moves to the corresponding avoidance position 101, due to the presence of a virtual position at this position, the user can control the second operating rod 400 to press the second push rod 230 located in the avoidance position 101 to the left, forcing the second push rod 230 to move in the direction of leaving the avoidance position 101, thereby forcing the swing frame 200 to rotate, and then forcing the first push rod 220 to move deeper into the corresponding avoidance position 101 to push the first operating rod 300 to the left and leave the avoidance position 101. Once the first operating rod 300 leaves the avoidance position 101, the first elastic member 610 releases its elastic force to drive the first operating rod 300 to reset, thereby finally achieving the retraction of the first refill 600.

[0044] Compared with the existing technology, since the linkage structure between the various components of this technology is more reasonably set, it can effectively reduce the failure rate of the pen core during operation, thereby meeting the dual-pen core needs of medical staff.

[0045] like Figure 4 As shown, in some embodiments of the present invention, to enhance smoothness of operation, a slope 130 is provided between each slide groove and the corresponding escape position 101. The slope 130 extends downward from the top toward the centerline of the slide rail 100. The provision of the slope 130 allows the user to naturally slide the operating rod into the corresponding escape position 101 when pressing the operating rod. Furthermore, during the operation of retracting the pen refill, as long as the operating rod is pushed out slightly away from the escape position 101 by the ejector rod, the operating rod can completely leave the escape position 101 under the action of the slope 130 and the elastic member, thereby reducing the difficulty of operation and improving the positive feedback during operation.

[0046] In this embodiment, while the first refill 600 is retracted, the second refill 700 can also be extended. The specific operation process is as follows: With the first refill 600 extended, the user presses downward on the pressing head 301 of the second operating lever 400 to drive the second operating lever 400 toward the lower end of the second slide 120. When the second operating lever 400 moves to the corresponding clearance position 101, due to the presence of a virtual position at this position, the user can manipulate the second operating lever 400 to press the second push rod 230 located in the clearance position 101 to the left. If the user presses the second operating lever 400 lightly, the second operating lever 400 only drives the second push rod 230 to return to its original position, thereby pushing the first operating lever 300 out of the clearance position 101. At this time, the second operating lever 400 does not fully enter the corresponding clearance position 101. At this time, the user removes the external force, and the first operating lever 300 and the second operating lever 400 completely leave the clearance position 101 under the action of the corresponding inclined surface 130 and the elastic member. At this time, no refill is extended. If the user presses hard on the second operating rod 400, the second operating rod 400 not only drives the second push rod 230 to move away from the escape position 101 to push open the first operating rod 300, but also completely enters the corresponding escape position 101. At this time, the user removes the external force, and the first operating rod 300 leaves the escape position 101 under the action of the corresponding inclined surface 130 and the elastic member. However, since the second operating rod 400 is locked in the escape position 101, the second pen refill 700 remains extended.

[0047] In some embodiments of the present invention, since the writing pen is small in size, the structure inside the pen case 20 is very compact. Therefore, in order to save space, the sliding guide rail 100 reserves an installation position 140 between the first slide groove 110 and the second slide groove 120. The installation position 140 is set toward the interior of the sliding guide rail 100, and the swing frame 200 is set at the installation position 140, that is, the swing frame 200 is set inside the sliding guide rail 100.

[0048] like Figure 2 、 Figure 5 and Figure 6 As shown, the medical writing pen according to the second embodiment of the present invention includes the dual-core switching mechanism 10 according to the above-mentioned first embodiment of the present invention, and also includes a pen case 20. The dual-core switching mechanism 10 is installed inside the pen case 20. The lower end of the pen case 20 is provided with a pen outlet 21. The first pen core 600 and the second pen core 700 both have a moving path passing through the pen outlet 21. The pen case 20 is provided with two air avoidance grooves 22 parallel to each other, and the pressing head 301 of the first operating rod 300 and the pressing head 301 of the second operating rod 400 respectively extend a air avoidance groove 22.

[0049] Since the medical writing pen adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0050] A pen clip 800 is attached to the upper portion of the pen housing 20. This clip allows the medical writing pen to be clamped onto thick objects, such as documents or pockets. The pen clip 800 comprises a main body and a removable cover. The main body has a receiving cavity, which houses a seal that can be customized with the user's name. The removable cover is rotatably connected to the main body. A magnet is located at the free end of the removable cover, and an iron plate is positioned at the corresponding position on the main body.

[0051] When the movable cover closes the cavity, it magnetically connects to the holder through the attraction of the magnet and the iron sheet, preventing the seal from being exposed. When the seal is needed, simply apply enough force to overcome the magnetic force to open the movable cover, allowing the personalized seal to handle the repetitive signature tasks involved in daily nursing work.

[0052] It should be noted that the seal can be an atomic seal, which can store ink in the seal core. The ink seeps out from the core each time the seal is stamped, eliminating the need to apply ink on the ink pad, effectively improving work efficiency. In addition, the present invention does not specifically limit the movable connection structure between the movable cover and the clamping body. The two can also be connected by means of a snap or other method.

[0053] Furthermore, to facilitate ink refilling, the clamping body is provided with a filling hole connected to the receiving chamber. A seal, which can be a sealing screw, is detachably connected to the filling hole. When ink refilling is required, the seal is removed, and ink is then injected into the receiving chamber through the filling hole. After refilling is complete, the filling hole is sealed with the seal to prevent ink leakage.

[0054] like Figure 5 and Figure 6As shown, to meet the daily care needs of medical staff, the pen housing 20 is equipped with a pupil light 30 at the end away from the pen outlet 21, and a pupil comparison circle 40 is provided on the outer surface of the pen housing 20. The pupil is located in the center of the iris, slightly below the nose, and is circular. Under room light, the pupil of a normal adult is 2mm to 4mm and symmetrical. A difference of less than 0.25mm between the two pupils is considered physiological, while a difference of more than 1mm is considered unequal. Pupil size varies with light intensity. In low light, the pupil can be physiologically enlarged, reaching a maximum diameter of 7.5-8mm. Under the illumination of the pupil light 30, medical staff can judge the diameter of the pupil based on the pupil comparison circle 40. A pupil diameter greater than 5mm is called mydriasis, which is commonly seen in pathological factors. Mydriasis can be divided into bilateral mydriasis and unilateral mydriasis. When bilateral pupils are dilated, it is commonly seen in increased intracranial pressure, craniocerebral injury, belladonna drug poisoning, etc.; when unilateral pupil is dilated, it often indicates ipsilateral tentorial herniation.

[0055] To meet the daily care needs of medical staff, the pen housing 20 is equipped with a lighting lamp 50 at the end away from the pen outlet 21, and a scale 60 is provided on the outer surface of the pen housing 20. The lighting lamp 50 provides light for some examination items, such as oral examination or ear examination, and the scale 60 can measure the length of wounds or body data.

[0056] Of course, since the medical writing pen is a portable device, it also includes a power supply module, which includes a control circuit (not shown in the drawings), a circuit switch 71, a battery (not shown in the drawings), and a charging port 72. The circuit switch 71 and the charging port 72 are both located on the outer surface of the pen housing 20, while the control circuit and the battery are both located inside the pen housing 20. The control circuit is electrically connected to the pupil light 30 and the illuminating light 50, respectively. The circuit switch 71 has a three-position, two-way position and is used to control the on / off state of the control circuit to turn the pupil light 30 or the illuminating light 50 on or off. When the battery is low on power, as evidenced by dimming of the light, the battery can be recharged through the charging port 72.

[0057] It is understandable that the medical writing pen of the present invention may also be integrated with other different functional modules, such as a timing function or a temperature detection function, and is not limited to the above embodiments.

[0058] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. The dual-core switching mechanism is applied to a writing pen with a pen shell, characterized in that: include: A sliding guide rail is fixedly connected to the pen housing, and a first slide groove and a second slide groove are provided on both sides of the sliding guide rail, and a lower end of the first slide groove and a lower end of the second slide groove are provided with a clearance position. The sliding guide rail is provided with two guide holes, and the two guide holes are connected to the two clearance positions respectively. a swing frame rotatably connected to the pen housing, the swing frame having two swing arms, the two swing arms being hingedly connected to a first push rod and a second push rod, the first push rod and the second push rod respectively passing through one of the guide holes, so that the first push rod and the second push rod respectively extend to the corresponding avoidance position; a first operating rod connected to a first refill, the first operating rod being provided with a first protrusion and being slidably connected to the first sliding groove, wherein a moving path of the first operating rod intersects a moving path of the first ejector rod; a second operating rod connected to a second refill, the second operating rod being provided with a second protrusion and slidably connected to the second slide groove, wherein a movement path of the second operating rod intersects a movement path of the second ejector rod; A positioning plate is fixedly connected to the pen case, the positioning plate is located below the sliding guide rail, the positioning plate is provided with two positioning holes, the first pen core and the second pen core respectively pass through one of the positioning holes, the outer periphery of the first pen core is provided with a first elastic member, the first elastic member is clamped between the first protrusion and the positioning plate, the outer periphery of the second pen core is provided with a second elastic member, the second elastic member is clamped between the second protrusion and the positioning plate.

2. The dual-core switching mechanism according to claim 1, characterized in that: The sliding guide rail has a reserved installation position between the first sliding groove and the second sliding groove, and the swing frame is arranged at the installation position.

3. The dual-core switching mechanism according to claim 1, characterized in that: The first sliding groove and the second sliding groove are collectively referred to as sliding grooves. An inclined surface is provided between the sliding groove and the corresponding avoidance position, and the inclined surface extends from top to bottom toward the direction close to the center line of the sliding guide rail.

4. The dual-core switching mechanism according to claim 1, characterized in that: The first elastic member and the second elastic member are both compression springs.

5. A medical writing pen, characterized in that: include: Pen case; The dual-core switching mechanism according to any one of claims 1 to 4, wherein the dual-core switching mechanism is installed inside the pen housing, a pen outlet is provided at the lower end of the pen housing, the first pen refill and the second pen refill both have a moving path passing through the pen outlet, the pen housing is provided with two mutually parallel avoidance grooves, and the first operating lever and the second operating lever respectively extend from one of the avoidance grooves.

6. The medical writing pen according to claim 5, characterized in that: The pen housing is connected with a pen clip, which comprises a clamping body and a movable cover. The movable cover is movably connected to the clamping body. The clamping body has an accommodating cavity, and the accommodating cavity is provided with a seal.

7. The medical writing pen according to claim 6, characterized in that: The clamping body is provided with a filling hole communicated with the accommodating cavity, and the filling hole is detachably connected to a sealing member.

8. The medical writing pen according to claim 5, characterized in that: The pen shell is provided with a pupil light at one end away from the pen outlet, and the outer surface of the pen shell is provided with a pupil comparison circle.

9. The medical writing pen according to claim 5, characterized in that: The pen shell is provided with an illuminating lamp at one end away from the pen outlet, and a graduated ruler is provided on the outer surface of the pen shell.

10. The medical writing pen according to claim 8 or 9, characterized in that: It also includes a power supply module, which includes a control circuit, a circuit switch, a battery and a charging port. The circuit switch and the charging port are both arranged on the outer surface of the pen housing, and the control circuit and the battery are both arranged inside the pen housing.

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