CN111772714A

CN111772714A - Pulse pressing device

Info

Publication number: CN111772714A
Application number: CN202010786228.3A
Authority: CN
Inventors: 高强; 乔徽; 张兆东; 徐砚捷; 李军; 曹洁; 陈波; 郭玮
Original assignee: Haining Harbin Machinery Co Ltd
Current assignee: Lb Ke Ce Shanghai Intelligent Medical Technology Co ltd
Priority date: 2020-08-06
Filing date: 2020-08-06
Publication date: 2020-10-16
Anticipated expiration: 2040-08-06
Also published as: CN111772714B

Abstract

The invention relates to the field of pulse pressing equipment, in particular to a pulse pressing device. The tourniquet comprises a base, a handle, an armpit support, a tourniquet ring, a linkage component, a brake component and a locking switch; the handle and the pulse pressing ring are in sliding fit with the base, and are connected with the linkage assembly, and the handle can drive the pulse pressing ring to move in the same direction through the linkage assembly; the armpit support is used for positioning the armpit position of the patient, and when the armpit position of the patient moves to the armpit support, the pulse pressing ring surrounds the preset pulse pressing position on the upper arm of the patient; the locking switch and the release switch are electrically connected with the brake assembly, and after the locking switch is turned on, the brake assembly acts and locks the linkage assembly; after the release switch is turned on, the brake component resets and releases the linkage component. The tourniquet can position the arm of a patient without the need of adjusting the arm of the patient by medical personnel, thereby improving the blood sampling efficiency and reducing the labor intensity of the medical personnel.

Description

Pulse pressing device

Technical Field

The invention relates to the field of pulse pressing equipment, in particular to a pulse pressing device.

Background

When a patient is hospitalized, medical staff often require the patient to test blood to find the cause of disease, and therefore the medical staff is required to take blood for the patient.

At present, in some occasions, when a medical worker takes blood for a patient, the tourniquet can be replaced by the tourniquet to realize the tourniquet effect on the arm of the patient, so that the medical worker does not need to tighten or loosen the tourniquet manually, and the labor intensity of the medical worker is reduced to a certain extent.

However, the existing tourniquet still requires the medical staff to cooperate with the patient so that the tourniquet can be pressed on the correct position of the arm of the patient, and in the process, the patient is likely to need to adjust for several times to enable the arm to reach the position meeting the requirement; in addition, after the arm of the patient reaches the correct value, the handle on the tourniquet still may move, so that the arm of the patient is easy to move again after being in place, the arm deviates from the position meeting the requirement, the arm needs to be adjusted again, the blood sampling efficiency is reduced, and the labor intensity of medical staff is increased.

In summary, it is an urgent technical problem to be solved by those skilled in the art to overcome the above-mentioned drawbacks of the existing tourniquets.

Disclosure of Invention

The invention aims to provide a tourniquet to solve the technical problem that the arm of a patient cannot be positioned in the tourniquet in the prior art.

The invention provides a tourniquet which comprises a base, a handle, an underarm support, a tourniquet ring, a linkage component, a brake component and a locking switch.

The handle and the pulse pressing ring are in sliding fit with the base, the handle and the pulse pressing ring are connected with the linkage assembly, and the handle can drive the pulse pressing ring to move in the same direction through the linkage assembly; the armpit support is fixed on the base, the armpit support is used for positioning the armpit position of a patient, and when the armpit position of the patient moves to the armpit support, the pulse pressing ring surrounds the preset pulse pressing position on the upper arm of the patient.

The locking switch and the release switch are electrically connected with the brake assembly, and after the locking switch is turned on, the brake assembly acts and locks the linkage assembly; and after the release switch is switched on, the brake component resets and releases the linkage component.

Preferably, as an implementation mode, the ratio a of the moving speed of the handle to the moving speed of the tourniquet ranges from 2.9 to 4.

The distance between the handle and the underarm support is d1, the distance between the tourniquet and the underarm support is d2, and d1/d2 is a.

Preferably, as an implementable mode, the linkage assembly includes a master synchronous belt, a first master synchronous wheel, a second master synchronous wheel, a slave synchronous belt, a first slave synchronous wheel and a second slave synchronous wheel, the master synchronous belt is fixedly connected with the handle, the slave synchronous belt is fixedly connected with the pulse pressing ring, the first master synchronous wheel and the second master synchronous wheel are respectively in transmission fit with two ends of the master synchronous belt, and the first slave synchronous wheel and the second slave synchronous wheel are respectively in transmission fit with two ends of the slave synchronous belt.

The first master synchronizing wheel and the first slave synchronizing wheel are coaxially fixed, and the perimeter ratio b of the first master synchronizing wheel to the first slave synchronizing wheel is equal to the moving speed ratio a of the handle to the tourniquet.

Preferably, as an implementable mode, the brake assembly includes a brake disc, an electromagnet, a guide member and at least two sliding shafts, the brake disc and the second main synchronizing wheel are fixedly connected, the guide member is fixed on the base, the sliding shafts are in sliding fit with the guide member, the sliding shafts are fixedly connected with the electromagnet, the electromagnet is arranged opposite to the brake disc, and the electromagnet can be close to or deviate from the brake disc.

The locking switch and the release switch are electrically connected with the electromagnet, and after the locking switch is turned on, the electromagnet is electrified and is fixedly adsorbed with the brake disc; and after the release switch is opened, the electromagnet is powered off and the brake disc is released.

Preferably, as an implementation mode, a first elastic element is connected between the handle and the base, the first elastic element extends along the moving direction of the handle, and the first elastic element can pull the handle to return.

Preferably, as an embodiment, the locking switch is mounted on the underarm support, and the locking switch is turned on when the top of the underarm support moves from the initial position to the grip by a predetermined distance; when the underarm support is reset, the locking switch is turned off.

Preferably, as an implementable mode, the armpit supports including supporting seat, lifting frame, locating part and trigger piece, lifting frame with the supporting seat passes through pivot normal running fit, the pivot with the moving direction of handle is perpendicular, lifting frame be in the position of the top of pivot is used for contacting with patient's armpit position, the locating part is fixed on the supporting seat, the locating part with lifting frame orientation the second elastic component is passed through to one side of handle and is connected.

The locking switch is installed on the limiting part, and the trigger part is installed at the position, located above the rotating shaft, of the lifting frame.

Preferably, as an implementation mode, an air bag switch is installed on the handle, and when the air bag switch is pressed down and the brake component locks the linkage component, the air bag of the pulse pressing ring inflates the pulse pressing ring.

Preferably, as an implementation mode, the tourniquet further comprises a hygienic film driving component, the tourniquet is provided with an opening, the hygienic film can be sleeved outside the tourniquet from the opening, and the hygienic film driving component can drive the hygienic film to move from one side of the opening to the other side of the opening along the circumferential direction of the tourniquet.

Preferably, as an implementation mode, the hygienic film driving assembly comprises a driver, a supply reel and a material receiving reel, wherein the supply reel and the material receiving reel are both in running fit with the base, the supply reel is used for installing a hygienic film roll, and the material receiving reel is used for reeling up a waste hygienic film; the driver is connected with the material receiving reel and used for driving the material receiving reel to rotate.

The pulse pressing device provided by the invention has the beneficial effects that:

the invention provides a tourniquet which mainly comprises a base, a handle, an oxter support, a tourniquet ring, a linkage assembly, a brake assembly, a locking switch and a release switch, wherein the handle and the tourniquet ring are in sliding fit with the base and are also connected with the linkage assembly; the armpit supports to be fixed on the base, can fix a position patient armpit position, that is to say, patient's arm can pass armpit support and pressure pulse circle in proper order, moves to handle department and holds the handle until patient's hand to can promote the handle and remove, when patient armpit position moved armpit support department, the armpit support can form and block patient's health, makes patient's arm unable continuation forward movement, and the position also consequently obtains confirming.

It should be noted that, the distance between the tourniquet and the armpit support can be adaptively adjusted according to the length of the arm of the patient when the patient pushes the handle to move, so that when the armpit position of the patient moves to the armpit support, the tourniquet can surround the preset tourniquet position on the upper arm of the patient (i.e. the correct tourniquet position during actual blood collection).

In addition, the brake component is electrically connected with the locking switch, when the arm of the patient is in place, the locking switch is turned on, the brake component acts, and at the moment, the linkage component can be locked by the brake component, so that the synchronous belt cannot move continuously, and further, the handle can be stopped at the current position, therefore, the arm of the patient is not easy to move again after in place, can be stably stopped at the position meeting the requirement, time and labor are not consumed due to the fact that the arm is adjusted again, pulse compression efficiency is convenient to improve, and labor intensity of medical staff is reduced; after the blood sampling is completed, the release switch is opened, the brake assembly resets, and at the moment, the brake assembly can release the linkage assembly, so that the linkage assembly can run freely, and the next patient can be used normally.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic perspective view of a tourniquet according to an embodiment of the present invention;

fig. 2 is a schematic perspective view of a transmission assembly in the tourniquet according to an embodiment of the present invention;

fig. 3 is a schematic top view of a portion of a tourniquet according to an embodiment of the present invention;

FIG. 4 is an enlarged view of portion A of FIG. 3;

FIG. 5 is a schematic view of an assembly structure of a brake assembly and a second main synchronizing wheel in the tourniquet according to an embodiment of the present invention;

fig. 6 is a schematic view of an assembly structure of a base, an underarm support and a locking switch in the tourniquet according to an embodiment of the present invention;

fig. 7 is an enlarged view of a portion B in fig. 6.

Icon:

100-a base;

200-pressing the pulse ring;

300-underarm support; 310-a support base; 320-lifting frame; 330-a stop; 340-a trigger; 350-a rotating shaft; 360-a second elastic member;

400-a grip;

510-brake disc; 520-an electromagnet; 530-a guide; 540-sliding shaft;

600-a linkage assembly; 610-primary synchronous belt; 620-a first primary synchronizing wheel; 630-a second primary synchronizing wheel; 640-slave synchronous belt; 650-a first slave synchronizing wheel; 660 — a second slave synchronizing wheel;

700-a locking switch;

800-a first elastic member;

910-a supply spool; 920-receiving the material reel.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "inner", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The present invention will be described in further detail below with reference to specific embodiments and with reference to the attached drawings.

Referring to fig. 1, 6 and 7, the tourniquet provided in this embodiment mainly comprises a base 100, a handle 400, an underarm support 300, a tourniquet 200, a linkage assembly 600, a brake assembly and a locking switch 700, wherein the handle 400 and the tourniquet 200 are both in sliding fit with the base 100, and the handle 400 and the tourniquet 200 are also both connected with the linkage assembly 600, so that when a patient pushes the handle 400 to move, the handle 400 can drive the tourniquet 200 to move in the same direction through the linkage assembly 600; the armpit support 300 is fixed on the base 100, and can position the armpit position of the patient, that is, the arm of the patient can pass through the armpit support 300 and the pulse pressing ring 200 in sequence until the hand of the patient moves to the grip 400 and holds the grip 400, and can push the grip 400 to move, when the armpit position of the patient moves to the armpit support 300, the armpit support 300 can block the body of the patient (it should be noted that the armpit position of the patient is generally covered by clothes, and the armpit position is the position farthest from the puncture point on the arm, so the armpit support 300 is used for blocking and positioning, and blood contact is not easy to occur), so that the arm of the patient cannot move forwards continuously, and the position is also determined.

It should be noted that, the distance between the tourniquet 200 and the underarm support 300 can be adaptively adjusted according to the arm length of the patient when the patient pushes the handle 400 to move, so that the tourniquet 200 can surround the preset tourniquet position on the upper arm of the patient (i.e. the correct tourniquet position when actually taking blood) when the underarm position of the patient moves to the underarm support 300.

In addition, the brake component is electrically connected with the locking switch 700, when the arm of the patient is in place, the locking switch 700 is turned on, the brake component acts, and at the moment, the linkage component 600 can be locked by the brake component, so that the synchronous belt cannot move continuously, and further, the handle 400 can be stopped at the current position, therefore, the arm of the patient is not easy to move again after being in place, can be stably stopped at the position meeting the requirement, time and labor cannot be consumed due to the fact that the arm is adjusted again, pulse compression efficiency is convenient to improve, and labor intensity of medical staff is reduced; after the blood sampling is completed, the release switch is opened, the brake assembly resets, and at the moment, the brake assembly can release the linkage assembly 600, so that the linkage assembly 600 can freely run, and the next patient can be normally used.

Specifically, the range of the ratio a of the moving speed of the grip 400 to the moving speed of the tourniquet 200 can be set to be 2.9-4, and meanwhile, the ratio d1/d2 of the distance d1 between the grip 400 and the axillary support 300 to the distance d2 between the tourniquet 200 and the axillary support 300 is set to be equal to the value of a.

It should be noted that, no matter how long the arm of the patient is, the proportion of the whole arm occupied by the correct tourniquet position of the upper arm of the patient and the distance between the upper arms of the patient is basically not changed, and in general, the ratio of the length of the whole arm of the patient to the correct tourniquet position of the upper arm of the patient and the distance between the upper arms of the patient is between 2.9 and 4, so the positioning mechanism provided in this embodiment can make the tourniquet 200 stay at the correct tourniquet position.

The ratio a of the moving speed of the grip 400 to the moving speed of the tourniquet 200 is preferably 3.18 or 3.2.

Referring to fig. 2 and 3, a main timing belt 610, a first main timing wheel 620, a slave timing belt 640, and a first slave timing wheel 650 may be disposed in the specific structure of the linkage assembly 600, the main timing belt 610 is fixedly connected to the handle 400, the slave timing belt 640 is fixedly connected to the pulse pressing ring 200, and meanwhile, the first main timing wheel 620 and the second main timing wheel 630 are respectively in transmission fit with two ends of the main timing belt 610, and the first slave timing wheel 650 and the second slave timing wheel 660 are respectively in transmission fit with two ends of the slave timing belt 640; in addition to the above-described mechanism, the first master synchronizing wheel 620 and the first slave synchronizing wheel 650 are coaxially fixed, and the ratio of the circumferential length of the first master synchronizing wheel 620 to the circumferential length of the first slave synchronizing wheel 650 is set to be equal to the ratio of the moving speed of the grip 400 to the moving speed of the tourniquet 200.

When the patient pushes the handle 400 to move, the handle 400 drives the master timing belt 610 to move, the running master timing belt 610 can drive the first master synchronizing wheel 620 to rotate, the first master synchronizing wheel 620 rotates to drive the first slave synchronizing wheel 650 to synchronously rotate with the master synchronizing wheel 650, and the angular velocities of the master synchronizing wheel 610 and the first slave synchronizing wheel 650 are the same, so the ratio of the linear velocities of the rolling surfaces of the first master synchronizing wheel 620 and the first slave synchronizing wheel 650 is the ratio of the circumferences of the first master synchronizing wheel 620 and the first slave synchronizing wheel 650, and because the ratio of the circumferences of the first master synchronizing wheel 620 and the first slave synchronizing wheel 650 is the same as the moving velocity ratio of the handle 400 and the pulse pressing ring 200, the ratio of the velocity of the master timing belt 610 to the velocity of the slave timing belt 640 is the moving velocity ratio of the handle 400 to the pulse pressing ring 200, and therefore the linkage assembly 600 can realize the velocity conversion between the handle 400 and the pulse pressing ring 200.

Referring to fig. 4 and 5, in the above-described specific structure of the brake assembly, there are provided a brake disc 510, an electromagnet 520, a guide 530, and at least two sliding shafts 540, the brake disc 510 is fixedly connected to the second main synchronizing wheel 630, the guide 530 is fixed to the base 100 of the tourniquet, the sliding shafts 540 are slidably engaged with the guide 530, and the sliding shafts 540 are fixedly connected to the electromagnet 520, so that the sliding shafts 540 and the electromagnet 520 can be moved synchronously with respect to the guide 530.

The locking switch 700 and the releasing switch are electrically connected with the electromagnet 520, when the locking switch 700 is opened, the electromagnet 520 is electrified, at the moment, the electrified electromagnet 520 has magnetic force and can be adsorbed to the brake disc 510, and the electromagnet 520 cannot rotate because the number of the sliding shafts 540 is two, so that the brake disc 510 fixed with the electromagnet 520 cannot continue to rotate, and further, the second main synchronizing wheel 630 fixed with the brake disc 510 cannot continue to rotate, so that the braking purpose is realized, and the handle 400 can stably stay at the current position; when the release switch is turned on, the electromagnet 520 is de-energized, and at this time, the non-energized electromagnet 520 loses its magnetic force, so that the electromagnet releases the brake disc 510, so that the brake disc 510 can freely rotate following the second main synchronizing wheel 630.

Referring to fig. 3, a first elastic member 800 may be connected between the handle 400 and the base 100, and after the brake assembly is reset, the handle 400 can reset itself under the elastic tension of the first elastic member 800, so as to be convenient for the next patient to use.

Preferably, referring to fig. 6 and 7, the locking switch 700 is installed on the armpit support 300, the top of the armpit support 300 moves a certain distance toward the grip 400 when the armpit support 300 is pushed from the armpit of the patient, and when the top of the armpit support 300 deviates from the initial position toward the grip 400 by a predetermined distance, the locking switch 700 installed on the armpit support 300 is turned on, and the brake assembly is turned on; when the underarm support 300 is returned to its initial position, the locking switch 700 mounted to the underarm support 300 is automatically turned off. The motion of pushing the armpit support 300 by the armpit part of the patient is naturally generated, so that additional labor is not added, and the convenience is better; in addition, when the arm of the patient is in place, the locking switch 700 can be synchronously opened, the extra time for operating the locking switch 700 is not needed, and the pulse compression efficiency is improved.

Referring to fig. 6 and 7, in the specific structure of the under-arm support 300, a supporting seat 310, a lifting frame 320 and a limiting member 330 may be provided, the lifting frame 320 and the supporting seat 310 are rotatably fitted through a rotating shaft 350, and the rotating shaft 350 is perpendicular to the moving direction of the handle 400, so that after a patient extends an arm into the tourniquet 200, the under-arm portion of the patient contacts with a portion of the lifting frame 320 above the rotating shaft 350, and the portion of the lifting frame 320 above the rotating shaft 350 is pushed to rotate around the rotating shaft 350 towards the tourniquet 200; the limiting member 330 is fixed on the supporting seat 310, and the first limiting member 330 can be connected with one side of the movable assembly facing the handle 400 through the second elastic member 360, on one hand, the second elastic member 360 can not only adapt to the rotation of the movable assembly, but also form a certain buffer force to the movable assembly pushed by the armpit part of the patient, so that the movable assembly can rotate slowly; on the other hand, after the arm of the patient breaks away from the movable assembly, the movable assembly can automatically reset under the action of the elastic force departing from the grip 400, manual operation is not needed, and convenience is further improved.

Based on the above structure, the locking switch 700 is installed on the limiting member 330, and the trigger 340 is installed on the portion of the lifting frame 320 above the rotating shaft 350, so that when the movable assembly is pushed by the armpit of the patient, the trigger 340 will rotate around the rotating shaft 350 towards the grip 400 and enter the trigger area of the locking switch 700, and thus, the trigger 340 can be used to trigger the locking switch 700 to open after the arm of the patient is in place.

Particularly, an air bag switch can be installed on the handle 400, when the patient pushes the handle 400 in place (i.e. the armpit position of the patient moves to the armpit support 300), the patient can press the air bag switch by himself, at this time, if the brake component locks the linkage component 600, the air bag of the pulse pressing ring 200 is inflated to press the pulse; if the brake assembly has not locked the linkage assembly 600, the pressing action of the air bag switch is invalid, and the air bag of the pulse pressing ring 200 will not be inflated.

The tourniquet provided by the embodiment is further provided with a sanitary film driving assembly, the tourniquet 200 is provided with an opening, a sanitary film can be sleeved on the tourniquet 200 from the opening, the sanitary film driving assembly can drive the sanitary film to move from one side of the opening to the other side of the opening around the circumferential direction of the tourniquet 200, namely, the sanitary film driving assembly is started, the sanitary film can be pulled to move, so that an old sanitary film originally sleeved on the tourniquet 200 is pulled out, and a new sanitary film can be pulled onto the tourniquet 200 by the old sanitary film, therefore, the sanitary film can be replaced conveniently.

Referring to fig. 1, a driver is arranged in the specific structure of the sanitary film driving assembly, a feeding scroll 910 and a receiving scroll 920 are arranged, the feeding scroll 910 and the receiving scroll 920 are both matched with the base 100 in a rotating manner, and the driver is connected with the receiving scroll 920 to drive the receiving scroll 920 to rotate by the driver, when in use, the sanitary film is firstly sleeved on the feeding scroll 910, then the head end of the sanitary film is pulled out and sleeved on the pulse pressing ring 200, and the head end of the sanitary film is rolled on the receiving scroll 920, so that the sanitary film can be pulled to move forward when the receiving scroll 920 rotates, and the waste sanitary film is rolled on the receiving scroll 920, thereby realizing the replacement of the sanitary film.

Specifically, a motor may be used as the above-described driver.

In summary, the present invention discloses a tourniquet, which overcomes many technical defects of the conventional tourniquet. The tourniquet device that this embodiment provided can fix a position patient's arm, need not medical personnel and adjusts patient's arm to, improved blood sampling efficiency, reduced medical personnel intensity of labour.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A tourniquet is characterized by comprising a base (100), a handle (400), an armpit support (300), a tourniquet ring (200), a linkage component (600), a brake component, a locking switch (700) and a release switch;

the handle (400) and the pulse pressing ring (200) are in sliding fit with the base (100), the handle (400) and the pulse pressing ring (200) are connected with the linkage assembly (600), and the handle (400) can drive the pulse pressing ring (200) to move in the same direction through the linkage assembly (600); the armpit support (300) is fixed on the base (100), the armpit support (300) is used for positioning the armpit position of a patient, and when the armpit position of the patient moves to the armpit support (300), the tourniquet (200) surrounds the preset tourniquet position on the upper arm of the patient;

the locking switch (700) and the release switch are electrically connected with the brake assembly, and after the locking switch (700) is turned on, the brake assembly acts and locks the linkage assembly (600); after the release switch is turned on, the brake component resets and releases the linkage component (600).

2. The tourniquet according to claim 1, wherein the ratio a of the moving speed of the grip (400) to the moving speed of the tourniquet (200) is in the range of 2.9-4;

the distance between the grip (400) and the underarm support (300) is d1, the distance between the tourniquet (200) and the underarm support (300) is d2, and d1/d2 is a.

3. The tourniquet according to claim 2, wherein the linkage assembly (600) comprises a master timing belt (610), a first master timing wheel (620), a second master timing wheel (630), a slave timing belt (640), a first slave timing wheel (650) and a second slave timing wheel (660), the master timing belt (610) is fixedly connected with the handle (400), the slave timing belt (640) is fixedly connected with the tourniquet ring (200), the first master timing wheel (620) and the second master timing wheel (630) are respectively in transmission fit with two ends of the master timing belt (610), and the first slave timing wheel (650) and the second slave timing wheel (660) are respectively in transmission fit with two ends of the slave timing belt (640);

the first master synchronizing wheel (620) and the first slave synchronizing wheel (650) are coaxially fixed, and the perimeter ratio b of the first master synchronizing wheel (620) to the first slave synchronizing wheel (650) is equal to the ratio a of the moving speed of the grip (400) to the moving speed of the tourniquet (200).

4. The tourniquet according to claim 3, wherein the brake assembly comprises a brake disc (510), an electromagnet (520), a guide member (530), and at least two sliding shafts (540), the brake disc (510) is fixedly connected to the second main synchronizing wheel (630), the guide member (530) is fixed to the base (100), the sliding shafts (540) are slidably engaged with the guide member (530), the sliding shafts (540) are fixedly connected to the electromagnet (520), the electromagnet (520) is disposed opposite to the brake disc (510), and the electromagnet (520) can approach or depart from the brake disc (510);

the locking switch (700) and the releasing switch are electrically connected with the electromagnet (520), and after the locking switch (700) is opened, the electromagnet (520) is electrified and is fixedly adsorbed to the brake disc (510); after the release switch is opened, the electromagnet (520) is powered off and the brake disc (510) is released.

5. The tourniquet according to claim 1, wherein a first elastic member (800) is connected between the handle (400) and the base (100), the first elastic member (800) extends along a moving direction of the handle (400), and the first elastic member (800) can pull the handle (400) to return.

6. The tourniquet according to any of claims 1-5, wherein the locking switch (700) is mounted on the underarm support (300), and the locking switch (700) is turned on when the top of the underarm support (300) is moved from an initial position towards the grip (400) by a predetermined distance; when the underarm support (300) is reset, the locking switch (700) is closed.

7. The tourniquet according to claim 6, wherein the armpit support (300) comprises a support base (310), a lifting frame (320), a limiting member (330) and a trigger member (340), the lifting frame (320) is rotatably fitted to the support base (310) through a rotating shaft (350), the rotating shaft (350) is perpendicular to the moving direction of the handle (400), a portion of the lifting frame (320) above the rotating shaft (350) is used for contacting with an armpit portion of a patient, the limiting member (330) is fixed on the support base (310), and the limiting member (330) is connected to a side of the lifting frame (320) facing the handle (400) through a second elastic member (360);

the locking switch (700) is installed on the limiting part (330), and the trigger part (340) is installed at the position, above the rotating shaft (350), of the lifting frame (320).

8. The tourniquet according to any of claims 1 to 5, wherein an air bag switch is mounted on the handle (400), and when the air bag switch is pressed down and the brake assembly locks the linkage assembly (600), the air bag of the tourniquet ring (200) inflates and tourniquet.

9. A tourniquet according to any of claims 1 to 5, further comprising a hygienic film driving assembly, wherein the tourniquet (200) has an opening and a hygienic film can be fitted over the tourniquet (200) from the opening, the hygienic film driving assembly being capable of driving the hygienic film to move from one side of the opening to the other side of the opening in the circumferential direction of the tourniquet (200).

10. The tourniquet according to claim 9, wherein the hygienic film driving assembly comprises a driver, a supply spool (910) and a take-up spool (920), the supply spool (910) and the take-up spool (920) each being rotationally engaged with the base (100), the supply spool (910) being for mounting a hygienic film roll, the take-up spool (920) being for taking up a discarded hygienic film; the driver is connected with the material receiving reel (920) and used for driving the material receiving reel (920) to rotate.