A bone marrow cell smear applicator

Abstract

This invention discloses a bone marrow cell slide pusher. This device, driven by a motor, allows for precise control of the pushing force and speed during the slide pushing process. This ensures stable and uniform contact pressure between the slide and the slide holder each time, effectively solving the problem of inconsistent smear thickness caused by uneven force in traditional manual operation. This results in more uniform cell distribution and provides a high-quality sample basis for pathological diagnosis. The curved reciprocating motion path design at the end of the pusher rod, combined with the elastic buffer structure of the first and second springs, ensures a tight fit between the slide and the slide holder during the pushing stage through spring tension. Simultaneously, the crank-connecting rod structure fundamentally eliminates the risk of specimen damage during the return journey, significantly reducing the sample rejection rate.

Description

Technical Field

[0001] This utility model belongs to the field of medical device technology, specifically relating to a bone marrow cell pusher. Background Technology

[0002] In the field of medical laboratory testing, bone marrow cell morphology examination is a crucial method for diagnosing hematological diseases and related conditions, and the preparation of high-quality bone marrow smears directly impacts diagnostic accuracy. Traditional bone marrow cell smear preparation relies heavily on manual labor, requiring operators to hold the slide and move it across a glass slide at a specific angle. This method presents numerous technical challenges. Manual operation is significantly affected by human factors, making it difficult to maintain consistency in the angle, force, and speed of the slide movement. This easily leads to uneven smear thickness, inconsistent cell density, and even cell deformation and breakage, affecting microscopic observation. Furthermore, during the manual slide movement, contact between the slide and the glass slide during the return stroke can damage the prepared smear, increasing sample rejection rates. In addition, it demands a high level of skill from the operator; novices struggle to quickly master the slide-moving techniques, resulting in low efficiency and poor reproducibility. While existing automated slide pushing equipment can partially replace manual operation, it generally suffers from complex structure and high cost. Furthermore, it lacks the ability to dynamically adjust the contact state between the slide and the glass slide during the pushing process, making it impossible to accurately simulate ideal pushing conditions and thus failing to meet the clinical and research needs for high-quality bone marrow smears. Utility Model Content

[0003] To solve the above-mentioned technical problems, this utility model designs a bone marrow cell slide pusher; the device can achieve precise control of the pushing force and speed by relying on the motor drive during the pushing process, ensuring that the pushing slide and the supporting slide maintain a stable and uniform contact pressure each time the slide is pushed.

[0004] To achieve the above-mentioned technical effects, this utility model is implemented through the following technical solution: a bone marrow cell pusher, comprising: a mounting base, a pusher base, a first spring, a second spring, a sliding base, a motor, a rotating base, a pusher rod, a rocker arm, and a crank;

[0005] The motor is fixedly mounted at the end of the mounting base; the rotating seat is fixedly mounted at the top of the mounting base; the crank is fixedly connected to the motor output shaft; the rocker arm is rotatably connected to the rotating seat; the middle part of the pusher rod is rotatably connected to the rocker arm; the end of the pusher rod is rotatably connected to the crank; one end of the first spring is fixedly connected to the front end of the pusher rod, and the other end of the first spring is fixedly connected to the top of the pusher seat; one end of the second spring is fixedly connected to the bottom of the pusher seat, and the other end of the second spring is fixedly connected to the sliding seat; the sliding seat is slidably connected to the mounting base.

[0006] Furthermore, the front end of the mounting base is provided with a slide slot; a glass slide can be horizontally mounted in the slide slot;

[0007] Furthermore, a card slot is fixedly provided in the middle of the pusher seat; the pusher glass slide can be installed obliquely in the card slot; the angle between the card slot and the horizontal plane is between 25° and 35°.

[0008] Furthermore, a total of four first springs are provided, diagonally arranged on the top of the push plate seat;

[0009] Furthermore, there are a total of 6 second springs, with 3 second springs provided on each side of the sliding seat;

[0010] The device consists of a rocker arm, a crank, and a slide pusher, forming a crank-rocker mechanism. The slide pusher's end travel path is a curved reciprocating path. During slide pushing, the first and second springs ensure direct and close contact between the slide pusher and the slide carrier. Furthermore, after slide pushing, the slide will not contact the slide carrier during the return stroke, preventing damage to the prepared specimen. Simultaneously, the device, driven by a motor, ensures uniformity during each slide push.

[0011] The beneficial effects of this utility model are:

[0012] This invention discloses a bone marrow cell slide pusher. This device, driven by a motor, allows for precise control of the pushing force and speed during the slide pushing process. This ensures stable and uniform contact pressure between the slide and the glass slide during each push, effectively solving the problem of inconsistent smear thickness caused by uneven force in traditional manual operation. This results in more uniform cell distribution and provides a high-quality sample basis for pathological diagnosis. The curved reciprocating motion path design at the end of the pusher rod, combined with the elastic buffer structure of the first and second springs, ensures a tight fit between the slide and the glass slide during the pushing stage through spring tension. Simultaneously, the crank-connecting rod structure fundamentally eliminates the risk of specimen damage during the return trip, significantly reducing sample rejection rates. Furthermore, the motor-driven automated slide pushing mode eliminates reliance on operator experience. The standardized pushing process not only significantly improves work efficiency but also achieves high repeatability of the pushing effect through precise mechanical control. Compared to traditional equipment, this device has stronger applicability and practicality, providing an efficient, stable, and cost-effective bone marrow cell slide pushing solution for clinical and research scenarios. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0014] Figure 1 This is a schematic diagram of the overall structure of a bone marrow cell smear applicator;

[0015] Figure 2 This is a schematic diagram of the structure of a bone marrow cell slide pusher during slide pushing;

[0016] Figure 3 This is another schematic diagram of the structure of a bone marrow cell smear applicator during smear application;

[0017] Figure 4 This is a schematic diagram of the structure of a bone marrow cell pusher during its return journey;

[0018] Figure 5 This is a side view of a bone marrow cell smear applicator;

[0019] The attached diagram lists the components represented by each number as follows:

[0020] 1-Mounting base, 2-Push plate base, 3-First spring, 4-Second spring, 5-Sliding base, 6-Motor, 7-Rotating base, 8-Push plate rod, 9-Rock arm, 10-Crank, 11-Slide, 12-Push plate. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model; obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0022] Example 1

[0023] This utility model discloses a bone marrow cell slide applicator, referenced... Figures 1 to 5 The device includes: a mounting base 1, a pusher seat 2, a first spring 3, a second spring 4, a sliding seat 5, a motor, a rotating seat 7, a pusher rod 8, a rocker arm 9, and a crank 10. The motor is vertically fixed in the motor mounting slot at the end of the mounting base 1, with its output shaft parallel to the horizontal plane, providing a stable power source for the entire device. The rotating seat 7 is integrally molded and fixed to the top front end of the mounting base 1, with its central axis coinciding with the longitudinal central axis of the mounting base 1, providing a precise fulcrum for the subsequent transmission mechanism. The crank 10 is interference-fitted with the motor output shaft via a flat key, ensuring effective torque transmission. One end of the rocker arm 9 is rotatably connected to the transverse pin of the rotating seat 7 via a deep groove ball bearing, forming a stable hinge structure. The oblong hole in the middle of the pusher rod 8 is clearance-fitted with the cylindrical pin at the front end of the rocker arm 9, allowing for a certain range of axial sliding while achieving a rotatable connection. The end of the pusher rod 8 is rotatably connected to the free end of the crank 10 via a spherical bearing, forming a complete crank 10-rocker 9 mechanism.

[0024] Regarding the elastic buffer system, the first spring group 3 consists of four identical cylindrical helical compression springs. One end of each spring is threadedly connected to the flange at the front end of the pusher rod 8 via a spring seat, while the other end is elastically connected to the spring mounting plate on top of the pusher seat 2 via a ball joint structure. This diagonal distribution design effectively balances the lateral force during the pusher process. The second spring group 4 consists of six high-strength alloy springs, with three springs evenly distributed on each side of the sliding seat 5. One end of each spring is embedded in a groove at the bottom of the pusher seat 2, and the other end is interference-fitted with the spring positioning post at the top of the sliding seat 5, forming a two-stage buffer structure. The bottom of the sliding seat 5 and the groove of the mounting seat 1 form a high-precision sliding pair, ensuring smooth sliding and low frictional resistance.

[0025] Regarding the slide loading system, the bottom surface of the slide slot at the front end of the mounting base 1 is equipped with an elastic rubber pad, and limit slots are opened on both side walls to achieve precise horizontal positioning and quick loading and unloading of the slide 11. The card slot in the middle of the slide pusher 2 adopts a V-shaped opening design, and its inner wall is inlaid with a silicone anti-slip layer to achieve oblique clamping and fixing of the slide pusher 12.

[0026] The working principle and usage procedure of this device are as follows:

[0027] This device automates bone marrow cell smear preparation based on the motion characteristics of the crank 10 and rocker 9 mechanism. During operation, the motor drives the crank 10 in a circular motion, which in turn drives the rocker 9 to reciprocate around the rotating seat 7, thereby driving the end of the slide pusher 8 to move along a preset curved trajectory. The front end of the slide pusher 8 is elastically connected to the slide pusher seat 2 via a first set of springs 3, and the bottom of the slide pusher seat 2 is connected to the sliding seat 5 via a second set of springs 4. This double-sided spring structure allows the slide pusher 12 to adaptively adjust the pressure when contacting the slide 11, ensuring a stable and uniform contact force between the two. When the slide pusher 8 moves forward, the slide pusher 12 contacts the sample on the slide 11 at an angle of 25°-35° set by the card slot, evenly spreading the bone marrow cells into a thin film during the forward movement. On the return stroke, the slide pusher 8 rises along the curved trajectory, avoiding contact with the smear and preventing specimen damage.

[0028] In use, the operator first places the slide 11 horizontally into the slide slot at the front end of the mounting base 1, achieving precise positioning through the limiting slot; then, the pusher slide 12 is inserted obliquely into the card slot in the middle of the pusher base 2, ensuring a secure clamping. Based on the sample characteristics, the card slot is adjusted to a suitable tilt angle (25°-35°) using the angle adjustment mechanism, and the pusher speed and stroke parameters are set via the control panel. After starting the motor, the device automatically completes the pusher action. During this process, the first spring group 3 compensates for pressure fluctuations through elastic deformation, while the second spring group 4 absorbs vibrations from the sliding base 5, ensuring pusher stability. After pushering is complete, the motor reverses, driving the pusher rod 8 back to its original position. The entire process requires no manual intervention, achieving standardized and automated bone marrow cell smear preparation.

[0029] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the present invention to the specific implementation methods described.

Claims

1. A bone marrow cell smear applicator, characterized in that, include: The system comprises a mounting base, a pusher seat, a first spring, a second spring, a sliding seat, a motor, a rotating seat, a pusher rod, a rocker arm, and a crank. The motor is fixedly mounted at the end of the mounting base. The rotating seat is fixedly mounted at the top of the mounting base. The crank is fixedly connected to the output shaft of the motor. The rocker arm is rotatably connected to the rotating seat. The middle part of the pusher rod is rotatably connected to the rocker arm. The end of the pusher rod is rotatably connected to the crank. One end of the first spring is fixedly connected to the front end of the pusher rod, and the other end of the first spring is fixedly connected to the top of the pusher seat. One end of the second spring is fixedly connected to the bottom of the pusher seat, and the other end of the second spring is fixedly connected to the sliding seat. The sliding seat is slidably connected to the mounting base.

2. The bone marrow cell smear applicator according to claim 1, characterized in that, The mounting base has a slide slot at its front end; a glass slide can be horizontally mounted in the slide slot.

3. The bone marrow cell smear applicator according to claim 1, characterized in that, A card slot is fixedly provided in the middle of the pusher seat; the pusher glass slide can be installed obliquely in the card slot; the angle between the card slot and the horizontal plane is between 25° and 35°.

4. A bone marrow cell smear applicator according to claim 1, characterized in that, There are four first springs, which are diagonally arranged on the top of the push plate seat.

5. A bone marrow cell smear applicator according to claim 4, characterized in that, There are a total of 6 second springs, with 3 second springs on each side of the sliding seat.

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