CN204734492U - A new type of back-pressing type blood collection needle device - Google Patents

Abstract

The utility model discloses a novel rear-pressing type blood taking needle device, which comprises a shell, a needle body and a key, wherein the front end in the inner cavity of the shell is provided with a needle body guide groove, the rear end is provided with a key guide groove, the front end of the needle body is provided with a needle head, a spring is arranged between the key and the needle body, the needle body is provided with an elastic expansion arm expanding towards the front end of the inner cavity of the shell, the shell is internally provided with a first limit step for limiting the top of the elastic expansion arm, the key is provided with a push rod for separating the elastic expansion arm from the first limit step, the shell at the front end of the first limit step is internally provided with a guide inclined plane for leading the elastic expansion arm to, the shell is also internally provided with a first buckling hole matched with the elastic buckle to buckle the key when the key is assembled, a second limiting step for limiting the pressing stroke of the key and a second buckling hole matched with the elastic buckle to buckle the key after the key is pressed. The scheme has the advantages of simple and easy realization, few components, convenient installation, limit of the pressing stroke, convenient use, safety and reliability.

Description

A new type of back-pressing type blood collection needle device

[technical field]

The utility model relates to a novel back-press type blood collection needle device.

[Background technique]

At present, hospitals require the use of disposable blood collection needles with automatically retractable needles after blood collection to avoid cross-infection between patients and prevent medical staff from being punctured by mistake. There are many kinds of disposable blood collection needles common in the market, and there are many components, which are inconvenient to assemble.

Therefore, it is necessary to solve the above problems.

[utility model content]

The utility model overcomes the deficiencies of the above-mentioned technologies, and provides a novel rear-pressing type blood collection needle device, which has a simple structure and is easy to realize, has few components, is convenient to install, and has a limited position and buckle position in the pressing stroke, which is convenient, safe and reliable to use .

In order to achieve the above object, the utility model adopts the following technical solutions:

A new type of rear push blood collection needle device, including a housing 1, a needle body 2, and a button 3, the front end of the inner cavity of the housing 1 is provided with a needle body guide for the axial movement of the needle body 2 The groove 11 and the rear end are provided with a button guide groove 12 for the axial movement of the button 3, the front end of the needle body 2 is provided with a needle head 21, and a button for pressing is provided between the button 3 and the needle body 2. When the button 3 is used to use the blood collection needle device, the needle body 2 is elastically pushed to make the upper needle head 21 penetrate the spring 4 from the front end of the needle body guide groove 11 to the outside of the housing 1. The needle body 2 is provided with The elastic extension arm 22 deployed toward the front end of the inner cavity of the housing 1, the housing 1 is provided with a first limit step 13 for limiting the top of the elastic extension arm 22, and the button 3 is provided with a There is a push rod 31 for pressing the elastic extension arm 22 from the rear side when moving to the front end of the button guide groove 12 so that its top moves inward and breaks away from the first limiting step 13. The shell 1 at the front end of the step 13 is also provided with a guide slope 14 for retracting the elastic arm 22 when the needle body 2 moves forward so as to retract after the needle 21 is thrust out. The button 3 is also provided with an elastic buckle 32, and the housing 1 is also provided with a first buckle hole 15 for cooperating with the elastic buckle 32 when the button 3 is assembled. The button 3 has a second limit step 16 for limiting the stroke of pressing, and a second buckle hole 17 for cooperating with the elastic buckle 32 after the button 3 is pressed.

In the novel back-pressing blood collection needle device described above, the first limiting step 13 is provided with a notch 131 for the top of the push rod 31 to pass through.

As mentioned above, a new type of rear push-type blood collection needle device, the first limit step 13 is two, and its circumferential array is arranged in the housing 1, and each first limit step 13 is provided with a There are notched grooves 131, and there are two elastic extension arms 22, which are arranged in a circular array on the needle body 2.

As mentioned above, a new type of rear-pressing type blood collection needle device, the top of the push rod 31 is provided with an arc that is convenient for pressing the elastic extension arm 22 inwards and breaking away from the first limiting step 13 when moving forward. Surface 311.

In the above-mentioned novel rear push-type blood collection needle device, the elastic buckle 32 is arranged on the push rod 31 of the button 3 .

As described above, a new type of rear push-type blood collection needle device, the blood collection needle device also includes a needle cover 5, and the needle cover 5 penetrates from the front end of the housing 1 and is sleeved on the needle head 21 .

The beneficial effects of the utility model are:

1. There are few components in this case, the first limit step is set in the housing to initially limit the needle body and its upper elastic arm, and the first buckle hole is set to be buckled with the elastic buckle when the button is assembled With the buckle, it is convenient and easy to install, and the user can press the button to make the elastic arm get rid of the first limit step, so that the needle body can move forward quickly under the force of the spring, so that the needle can pierce the shell In vitro, it is simple and convenient to use, and then under the tension of the elastic arm, the needle moves in the opposite direction, and the needle retracts into the housing, which is safe and reliable. In addition, after use, the elastic buckle on the button The buckle is in the second buckle hole to prevent the blood collection needle device from being used again. In addition, the spring does not need to be pre-compressed when the blood collection needle device is assembled, and its stability is good. The direct experience of the blood collection process in this case is that the force is smaller and the speed is faster, and the use experience is better than that of the blood collection needle of the prior art.

2. The first limit step is provided with a notch for the top of the push rod to pass through, which ensures that the top of the push rod presses the elastic arm from the rear side and has enough travel to move the top of the elastic arm inward And breaking away from the first limiting step ensures that the needle body can move forward.

3. There are two first limiting steps, and their circumferential arrays are arranged in the housing, each of the first limiting steps is provided with a notch groove, and there are two elastic extension arms, and their circumferential arrays are arranged on the said housing. On the above-mentioned needle body, in this way, the symmetrical arrangement enhances the balance of the blood collection needle device.

4. There is an arc-shaped surface on the top of the push rod, which is convenient for pressing the elastic arm inwards and breaking away from the first limiting step when moving forward.

[Description of drawings]

Fig. 1 is an explosion diagram of the utility model.

Fig. 2 is the housing of the utility model.

Fig. 3 is a sectional view along A-A direction in Fig. 2 .

Fig. 4 is the assembly diagram after the needle body, the button and the button are housed on the housing of the utility model.

Fig. 5 is a sectional view along B-B direction in Fig. 4 .

[Detailed ways]

Below in conjunction with accompanying drawing and embodiment of the present utility model, further describe in detail:

As shown in Figures 1-5, a new type of push-back blood collection needle device includes a housing 1, a needle body 2, and a button 3. The front end of the inner cavity of the housing 1 is provided with a 2 The needle guide groove 11 for axial movement and the rear end are provided with a button guide groove 12 for the axial movement of the button 3, the front end of the needle body 2 is provided with a needle head 21, and the button 3 and the needle body 2 is provided with a spring 4 for pressing the button 3 to elastically push the needle body 2 to make the upper needle 21 stick out from the front end of the needle body guide groove 11 to the outside of the housing 1 when the blood collection needle device is pressed. The needle body 2 is provided with an elastic arm 22 that expands towards the front end of the inner cavity of the housing 1, and the housing 1 is provided with a first limit step for limiting the top of the elastic arm 22. 13. The button 3 is provided with a push button for pressing the elastic extension arm 22 from the rear side when moving toward the front end of the button guide groove 12 so that its top moves inward and breaks away from the first limiting step 13. Rod 31, the housing 1 at the front end of the first limiting step 13 is also provided for making the elastic extension arm 22 gather and store energy when the needle body 2 moves forward so that after the needle 21 is pierced, The retracted guide slope 14, the button 3 is also provided with an elastic buckle 32, and the housing 1 is also provided with a first button for cooperating with the elastic buckle 32 when the button 3 is assembled. Buckle holes 15, a second limit step 16 for pressing the button 3 to limit the stroke, and a second step for buckling with the elastic buckle 32 after the button 3 is pressed. Buckle hole 17.

The above-mentioned first limit step 13 is provided with a notch groove 131 for the top of the push rod 31 to pass through, which ensures that the top of the push rod 31 has a sufficient stroke when pressing the elastic extension arm 22 from the rear side. The top of the elastic extension arm 22 moves inward and breaks away from the first limiting step 13 to ensure that the needle body 2 can move forward.

As mentioned above, in this embodiment, there are two first limiting steps 13, which are arranged in a circular array in the housing 1, and each first limiting step 13 is provided with a notch 131, There are two elastic arms 22, which are arranged in a circular array on the needle body 2. In this way, the symmetrical arrangement enhances the balance of the blood collection needle device.

As mentioned above, the top of the push rod 31 in this case is provided with an arc-shaped surface 311 , which is convenient for pressing the elastic extension arm 22 inwards and breaking away from the first limiting step 13 when moving forward.

As mentioned above, the elastic buckle 32 in this case is arranged on the push rod 31 of the button 3 .

As mentioned above, the blood collection needle device in this case also includes a needle cover 5 , which penetrates through the front end of the housing 1 and is sleeved on the needle 21 .

As mentioned above, there are few components in this case, and the assembly is convenient and fast. When assembling, the user first slides the needle body 2 into the needle body guide groove 11 along the button guide groove 12, and then sequentially installs the spring 4 and the button 3. Wherein, the elastic buckle 32 on the button 3 is buckled on the first buckle hole 15, and finally the needle cover 5 is penetrated from the front end of the housing 1 and set on the needle 21, Thereby completing the whole assembly process.

As mentioned above, the working principle and process of this case are as follows:

When in use, the user first pulls out the needle sheath 5 from the front end of the housing 1, presses the front end of the housing 1 lightly against the human skin, and presses the button 3 with the finger until it meets the second limit. After the position step 16 is released, at this time, the push rod 31 on the button 3 moves forward and presses the elastic extension arm 22 so that the top moves inward and breaks away from the first limit step 13, the needle The body 2 moves forward quickly under the action of the spring 4 to make the needle 21 pierce the outside of the housing 1, thereby piercing the skin of the human body. When the needle body 2 moves forward, the elastic arm 22 is positioned at the same time. Under the action of the guide slope 14, the needle 21 is folded to store energy. After the needle 21 finishes blood collection, the tension of the elastic extension arm 22 reacts on the guide slope 14, so that the needle 21 on the needle body 2 retracts into the housing 1 , until the elastic extension arm 22 is limited at the rear end of the first limiting step 13, and under the reaction force of the spring 4, the elastic buckle 32 moves slightly backward along with the button 3 and is buckled at The second buckle hole 17 is used to prevent the blood collection needle device from being used again.

As mentioned above, what this case protects is a new type of push-back blood collection needle device, and all technical solutions with the same or similar structure as this case should be shown to fall within the scope of protection of this case.

Claims (6)

1. A new type of back-pressing blood collection needle device, characterized in that it includes a housing (1), a needle body (2), and a button (3), and the front end of the inner cavity of the housing (1) is provided with a The needle guide groove (11) for axial movement of the needle body (2) and the rear end are provided with a button guide groove (12) for axial movement of the button (3), and the needle body (2) A needle (21) is provided at the front end, and a needle (2) is provided between the button (3) and the needle body (2) for pressing the button (3) to elastically push the needle body (2) when using the blood collection needle device A spring (4) that makes the upper needle (21) protrude from the front end of the needle body guide groove (11) to the outside of the housing (1), and the needle body (2) is provided with a ) the elastic arm (22) deployed at the front end of the inner cavity, the housing (1) is provided with a first limit step (13) for limiting the top of the elastic arm (22), the button (3) is provided with a button for pressing the elastic arm (22) from the rear side when moving to the front end of the button guide groove (12) so that the top moves inward and breaks away from the first limiting step (13) ), the housing (1) at the front end of the first limiting step (13) is also provided with a mechanism for making the elastic arm (22) move forward when the needle body (2) moves forward. Gather and store energy so as to facilitate retraction of the guide slope (14) after the needle (21) is pierced, the button (3) is also provided with an elastic buckle (32), and the housing (1) is also provided with a There is a first buckle hole (15) for cooperating with the elastic buckle (32) when assembling the button (3), and a hole for limiting the pressing stroke of the button (3). The second limit step (16), and the second buckle hole (17) for cooperating with the elastic buckle (32) after the button (3) is pressed. 2. A new type of back-pressing blood collection needle device according to claim 1, characterized in that the first limiting step (13) is provided with a notch for the top of the push rod (31) to pass through (131). 3. A new type of back-pressing type blood collection needle device according to claim 2, characterized in that there are two first limiting steps (13), and their circumferential arrays are arranged in the housing (1) , each first limiting step (13) is provided with a notch groove (131), and there are two elastic extension arms (22), which are arranged in a circular array on the needle body (2). 4. A new type of back-pressing blood collection needle device according to claim 1, characterized in that the top of the push rod (31) is equipped with a push rod (31) to facilitate pressing the elastic arm (22) inward when moving forward. detached from the arc surface (311) of the first limiting step (13). 5. A novel back-press type blood collection needle device according to claim 1, characterized in that the elastic buckle (32) is arranged on the push rod (31) of the button (3). 6. A new type of back-pressing blood collection needle device according to any one of claims 1-5, characterized in that the blood collection needle device also includes a needle cover (5), and the needle cover (5) is The front end of the casing (1) penetrates and sleeves on the needle (21).