CN106491142B - A retractable blood collection device - Google Patents

Abstract

The present invention relates to a retractable blood collection device comprising: the needle tube comprises a needle tube shell, a pressing cap, a cylindrical cam, a one-way bearing, a first spring, an upper end face cam, a lower end face cam, a central shaft, a guide sleeve, a second spring and a blood taking needle, wherein the pressing cap, the cylindrical cam, the one-way bearing, the first spring, the upper end face cam, the lower end face cam, the central shaft, the guide sleeve, the second spring and the blood taking needle are arranged in the needle tube shell; the device is punctured at a high speed instantly, and is retracted at a high speed after puncturing, so that the pain of a user can be greatly relieved by the instant puncturing, and the user can not respond even after puncturing is finished, so that the psychological burden of the user is greatly relieved. The principle of double-spring double-damping vibration is adopted in the needle, after the needle pierces the skin at a high speed in a one-time pressing process, the needle cannot pop out again to pierce the skin, so that the high speed during piercing can be maintained, and secondary damage caused by the high speed can be avoided. The unidirectional bearing only allows the lower end face cam to go forward unidirectionally, so that the pressing process can always perform cyclic reciprocating motion, and the pressing device can reset rapidly and automatically after being punctured, thereby saving a great amount of time.

Description

A retractable blood collection device

technical field

The invention relates to the technical field of medical devices, in particular to a retractable blood collection device.

Background technique

Blood collection needles are one of the most commonly used medical devices in hospitals when taking blood samples. However, it is worth noting that there are millions of human accidents caused by broken needles or improper operation of medical staff in hospitals around the world every year. Therefore, it is urgent to need a safe and convenient blood collection needle, but some blood collection needles on the market are either not easy to operate, or the safety performance is not up to standard. The existing blood collection needle mainly slides the needle core with the needle body in a housing, the inner wall of the front part of the housing is provided with a conical surface or an inclined surface, the front end is provided with a pinhole, and the needle core is symmetrically obliquely provided with an elastic sheet, which is aligned with the tapered surface or inclined surface. Sliding fit of the inclined surface constitutes the needle point retraction structure. The blood collection pen includes a shell and a locking shooting structure with a firing rod. Because the needle point of this mechanism is extended in the firing mode, it is easy to cause damage to the human body due to the inertia of the needle point piercing too deep.

Contents of the invention

In order to overcome the above defects, the object of the present invention is to provide a safer and more reliable retractable blood collection device.

The purpose of the present invention is achieved through the following technical solutions:

A retractable blood collection device of the present invention, comprising: a needle tube housing and a pressing cap arranged in the needle tube housing, a cylindrical cam, a one-way bearing, a first spring, an upper end cam, a lower end cam, a central shaft, and a guide sleeve , the second spring, and the blood collection needle; the pressing cap is set on the upper part of the needle tube shell to move up and down, the pressing cap is provided with sliding teeth, and the cylindrical cam is provided with tooth grooves, and the pressing cap is stuck in the tooth grooves through the sliding teeth and is set in the cylindrical On the upper part of the cam, the first spring is arranged between the pressing cap and the cylindrical cam. When the pressing cap moves up and down, the cylindrical cam is driven to rotate. The cylindrical cam is provided with a disc protrusion which is rotatably arranged on the needle tube On the inner wall of the shell, the lower part of the cylindrical cam is connected with the upper end face cam through a one-way bearing;

The upper end cam is provided with upper teeth, and the lower end cam is provided with lower teeth. The upper teeth on the upper end cam are engaged with the lower teeth on the lower end cam correspondingly, and the central shaft is fixedly connected to the center of the lower end cam. At the position, the guide sleeve is fixedly arranged on the inner wall of the needle tube casing, the central axis passes through the guide sleeve and is connected with the blood collection needle, and the second spring is arranged between the cam on the lower end face and the guide sleeve.

Further, the pressing cap is provided with a guide pin, and the needle tube housing is provided with a vertical limiting gap, and the pressing cap moves up and down in the limiting gap through the guide pin.

Further, there are two guide pins and two limiting gaps, which are arranged symmetrically.

Further, there are two sliding teeth and two tooth grooves, which are arranged symmetrically.

Further, a groove is provided on the upper part of the upper end cam, and the lower part of the cylindrical cam is installed in the groove of the upper end cam through a one-way bearing.

Further, both ends of the first spring are fixedly connected to the pressing cap and the cylindrical cam.

Further, both ends of the second spring are fixedly connected to the cam on the lower end face and the guide sleeve.

Further, the central axis is a square column.

Further, a nut is provided at the end of the central shaft, and a screw is connected to the end of the blood collection needle, and the screw is installed in the nut.

Furthermore, the blood collection needle is a disposable blood collection needle.

A retractable blood collection device provided by the present invention has the following technical effects:

1. This device uses high-speed instant piercing when piercing, and then retracts at high speed after piercing. Instant piercing will greatly reduce the pain of the user, and even after the piercing is completed, the user has no time to respond, which greatly reduces the pain. psychological burden on users.

2. Because the principle of double spring and double damping vibration is adopted inside, in the process of one pressing, after the needle pierces the skin at a high speed and deep, it cannot pop out again to pierce the skin, so that the high speed of piercing can be maintained and the needle can be avoided. Because of the secondary damage caused by high speed, it can be used with confidence.

3. The one-way bearing on the device only allows the cam on the lower end face to travel in one direction, so that the pressing process can always carry out cyclical reciprocating actions. After pressing and puncturing, the internal mechanism quickly and automatically resets, and the pressing cap bounces off by itself, which simplifies the doctor's process. Saved a lot of time.

Description of drawings

For ease of illustration, the present invention is described in detail by the following preferred embodiments and accompanying drawings.

Fig. 1 is a front sectional view of a retractable blood collection device of the present invention;

Fig. 2 is a partial sectional view of a retractable blood collection device of the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

Referring to Fig. 1-2, a retractable blood collection device of the present invention includes: a needle tube housing 1 and a pressing cap 2 arranged in the needle tube housing 1, a cylindrical cam 3, a one-way bearing 4, a first spring 5, an upper End face cam 6, lower end face cam 7, central shaft 8, guide sleeve 9, second spring 10, blood collection needle 11; the pressing cap 2 is arranged on the upper part of the needle tube housing 1 to move up and down, and the pressing cap 2 is provided with sliding teeth 12 , the cylindrical cam 3 is provided with a tooth groove 13, the push cap 2 is stuck in the tooth groove 13 through the sliding tooth 12 and fitted on the upper part of the cylindrical cam 3, the first spring 5 is arranged on the push cap 2 Between this cylindrical cam 3, when the pressing cap 2 moves up and down, it drives the cylindrical cam 3 to rotate. The cylindrical cam 3 is provided with a disc protrusion 14, which is rotatably arranged on the cylindrical cam 3. On the inner wall of the needle tube housing 1, the lower part of the cylindrical cam 3 is connected with the upper end face cam 6 through the one-way bearing 4;

The upper end cam 6 is provided with upper teeth (not shown), and the lower end cam 7 is provided with lower teeth (not shown), and the upper teeth on the upper end cam 6 are connected with the lower end cam 7 The upper and lower teeth mesh correspondingly, the central shaft 8 is fixedly connected to the center of the lower end face cam 7, the guide sleeve 9 is fixedly arranged on the inner wall of the needle tube housing 1, and the central shaft 8 passes through the guide sleeve 9 Connected with the blood collection needle 11 , the second spring 10 is arranged between the lower cam 7 and the guide sleeve 9 .

Wherein, the pressing cap 2 is provided with a guide pin 15, and the needle tube casing 1 is provided with a vertical limiting gap 16, and the pressing cap 2 is stuck in the limiting gap 16 by the guiding pin 15 to move up and down. , used to stabilize the limit. Preferably, there are two guide pins 15 and two limiting gaps 16, which are arranged symmetrically. Preferably, the number of the sliding teeth 12 and the tooth grooves 13 are two, and they are arranged symmetrically. The top of this upper end cam 6 offers groove (not shown), and the bottom of this cylindrical cam 3 is installed in the groove of this upper end cam 6 by one-way bearing 4, guarantees upper end cam 6 unidirectional rotation. Preferably, both ends of the first spring 5 are fixedly connected to the pressing cap 2 and the cylindrical cam 3 . Preferably, both ends of the second spring 10 are fixedly connected to the lower cam 7 and the guide sleeve 9 . Preferably, the central axis 8 is a square column. Preferably, a nut 17 is provided at the end of the central shaft 8, and a screw 18 is connected to the end of the blood collection needle 11, and the screw 18 is installed in the nut 17, which is convenient for adjusting the height of the blood collection needle 11. Preferably, the blood collection needle 11 is a disposable blood collection needle, which is safe and reliable.

When blood collection is required, place the lower end of the device on the skin and press the push cap 2, because the sliding teeth 12 of the push cap 2 are stuck in the tooth grooves 13 of the cylindrical cam 3, and the disc at the lower end of the cylindrical cam 3 is convex. Lifting 14 is stuck in the bayonet of the inner wall of needle tube housing 1, so cylindrical cam 3 rotates clockwise with the axis as the center under the effect of downward force of pressing cap 2. The cylindrical cam 3 drives the one-way bearing 4 to rotate, and the one-way bearing 4 drives the upper end cam 6 to the right to do one-way rotation with each tooth as a single stroke unit. Since the lower end cam 7 is fixedly connected to the central shaft 8, the central shaft 8 Be stuck in the guide sleeve 9 again, the guide sleeve 9 and the inner wall of the needle tube housing 1 are interference fit so the guide sleeve 9 is fixed, and the lower end face cam 7 reciprocates downward under the action of the teeth on the upper end face cam 6 . When the upper teeth of the upper cam 6 contact and rotate with the single tooth surface of the lower cam 7, the lower cam 7 moves downward, and the second spring 10 is compressed. When the upper teeth of the upper end cam 6 rotate to contact with the lower teeth of the lower end cam 7, the lower end cam 7 moves down to the lowest point, and the second spring 10 is also compressed to the maximum compression amount, at this time the blood collection needle 11 Stretch out the needle tube casing 1, puncture the skin, and complete the blood collection process. When the upper teeth of the upper end cam 6 are turned away from the lower teeth of the lower end cam 7, there will be a tooth body distance between the upper end cam 6 and the lower end cam 7, and the second spring 10 in the compressed state will Will rebound upwards, and the lower end surface cam 7 is moved upwards by the rebounding force of the second spring 10 to drive the blood collection needle 11 to move upwards and retract the needle tube housing 1 mile. Because of the relationship between the upper end cam 6 and the lower end cam 7, the upper end cam 6 will continue to rotate clockwise until the teeth of the upper end cam 6 and the lower end cam 7 are fully engaged. At the same time, the first spring 5 in the compressed state between the inside of the pressing cap 2 and the cylindrical cam 3 begins to rebound. Since the axial direction of the cylindrical cam 3 is fixed, the first spring 5 acts on the pressing cap 2 to make the pressing cap 2 upward. sports. As the pressing cap 2 moves upwards, the sliding teeth 12 on the pressing cap 2 also move upwards, so the cylindrical cam 3 is driven to rotate counterclockwise until the first spring 5 returns to the normal state.

A retractable blood sampling device provided by the present invention has the following advantages:

1. This device uses high-speed instant piercing when piercing, and then retracts at high speed after piercing. Instant piercing will greatly reduce the pain of the user, and even after the piercing is completed, the user has no time to respond, which greatly reduces the pain. psychological burden on users.

2. Because the principle of double spring and double damping vibration is adopted inside, in the process of one pressing, after the needle pierces the skin at a high speed and deep, it cannot pop out again to pierce the skin, so that the high speed of piercing can be maintained and the needle can be avoided. Because of the secondary damage caused by high speed, it can be used with confidence.

3. The one-way bearing 4 on the device only allows the cam 7 on the lower end face to travel in one direction so that the pressing process can always carry out cyclical reciprocating actions. After pressing and puncturing, the internal mechanism quickly and automatically resets, and the pressing cap bounces up by itself, which simplifies the doctor's work. process, saving a lot of time.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. within range.

Claims (10)

1. A retractable blood collection device, characterized in that it comprises: a needle tube housing and a pressing cap arranged in the needle tube housing, a cylindrical cam, a one-way bearing, a first spring, an upper end cam, a lower end cam, a central shaft , a guide sleeve, a second spring, and a blood collection needle; the pressing cap is arranged on the upper part of the needle tube housing to move up and down, the pressing cap is provided with sliding teeth, and the cylindrical cam is provided with tooth grooves, and the pressing cap passes through The sliding teeth are clamped in the tooth slots and fitted on the upper part of the cylindrical cam, the first spring is arranged between the pressing cap and the cylindrical cam, and the pressing cap drives the spring when it moves up and down. The cylindrical cam rotates, the cylindrical cam is provided with a disc protrusion, and the disc protrusion is rotatably arranged on the inner wall of the needle tube housing, and the lower part of the cylindrical cam is connected with the one-way bearing The upper face cam connection; The upper end cam is provided with upper teeth, and the lower end cam is provided with lower teeth, and the upper teeth on the upper end cam are engaged with the lower teeth on the lower end cam correspondingly. The central shaft is fixedly connected to the center of the lower end face cam, the guide sleeve is fixedly arranged on the inner wall of the needle tube housing, the central shaft passes through the guide sleeve and is connected with the blood collection needle, and the first Two springs are arranged between the lower end cam and the guide sleeve. 2. A retractable blood collection device according to claim 1, wherein a guide pin is provided on the pressing cap, and a vertical limit gap is provided on the needle casing, and the pressing cap The cap moves up and down in the limiting gap through the guide pin. 3 . The retractable blood collection device according to claim 2 , wherein there are two guide pins and two limiting gaps, which are arranged symmetrically. 4 . 4 . The retractable blood collection device according to claim 1 , wherein the number of the sliding teeth and the alveoli are both two, which are arranged symmetrically. 5. A retractable blood collection device according to claim 1, characterized in that, a groove is provided on the upper part of the cam on the upper end face, and the lower part of the cylindrical cam is mounted on the upper end face through a one-way bearing in the groove of the cam. 6 . The retractable blood sampling device according to claim 1 , wherein both ends of the first spring are fixedly connected to the pressing cap and the cylindrical cam. 7 . The retractable blood sampling device according to claim 1 , wherein both ends of the second spring are fixedly connected to the lower cam and the guide sleeve. 8. The retractable blood collection device according to claim 1, wherein the central axis is a square column. 9. A retractable blood collection device according to claim 1, wherein a nut is provided at the end of the central shaft, a screw is connected to the end of the blood collection needle, and the screw is installed on the inside the nut. 10. The retractable blood collection device according to claim 1, wherein the blood collection needle is a disposable blood collection needle.

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