CN112890813B - arterial blood collection needle - Google Patents

Abstract

The invention discloses an arterial blood taking needle. The method comprises the following steps: an injector body; the tail end of the liquid inlet one-way valve is detachably connected with the connecting seat; the tail end of the needle head is provided with a mounting seat, and the mounting seat is detachably connected with the front end of the liquid inlet one-way valve; the first outer sleeve is arranged on the periphery of the needle head, the inner diameter of the first outer sleeve is matched with the periphery of the first connecting part, and the first outer sleeve is fixedly connected with the mounting seat and used for covering the rear part of the needle head; and the second outer sleeve is at least partially arranged in the first outer sleeve and can move along the axial direction of the first outer sleeve, and the outer periphery of the second outer sleeve is matched with the inner periphery of the first outer sleeve and is used for covering the front part of the needle. The invention has the beneficial effects that: be equipped with first outer sleeve pipe and second outer sleeve pipe in the syringe needle periphery, can shield the syringe needle and avoid being stabbed medical personnel after the blood sampling.

Description

arterial blood collection needle

technical field

The invention relates to the field of medical devices, in particular to an arterial blood collection needle.

Background technique

Arterial blood gas analysis is an important laboratory test used to evaluate a patient's oxygenation, ventilation, and acid-base status. Arterial blood gas analysis can be used to understand the patient's lung function and body fluid acid-base balance, and it can be used as one of the important basis for the adjustment of mechanical ventilation parameters, curative effect analysis and prognosis judgment. With the development of medical technology, arterial blood gas analysis has been widely used clinically.

Accurate arterial blood gas analysis results are crucial to the diagnosis of respiratory failure and acid-base balance disorders, and qualified arterial blood samples are the prerequisite for ensuring accurate blood gas analysis results. Whole blood samples are generally used for blood gas analysis, and the samples are required to be collected correctly, isolated from the air, and sent for inspection in time, and the samples are required to be free of clots and hemolysis.

The existing arterial blood collection needles have the following defects. First, the needle is exposed, and medical staff are prone to be stabbed by the needle after blood collection; second, there is a risk of blood sample contamination after the needle is removed; third, the needle cannot be automatically removed.

Contents of the invention

The object of the present invention is to provide an arterial blood collection needle, which is provided with a first outer sleeve and a second outer sleeve on the periphery of the needle, which can avoid being stabbed after blood collection.

Another object of the present invention is to provide an arterial blood collection needle, which is provided with a one-way valve to avoid blood sample contamination.

To achieve the above object, the present invention adopts the following technical solutions, including:

The syringe body is provided with a lumen inside, and a connecting seat is provided at the front end of the syringe body, and a through hole communicating with the lumen is provided in the connecting seat;

a liquid inlet check valve, the end of which is detachably connected to the connecting seat; and

a needle, the end of which is provided with a mounting seat, and the mounting seat is detachably connected to the front end of the liquid inlet check valve;

The first outer sleeve is arranged on the outer circumference of the needle, the inner diameter of the first outer sleeve matches the outer circumference of the first connecting part, the first outer sleeve is fixedly connected with the mounting seat, and is used to cover the at the rear of the needle;

a second outer sleeve, which is at least partly disposed inside the first outer sleeve and is movable along the axial direction of the first outer sleeve, the outer circumference of the second outer sleeve matches the inner circumference of the first outer sleeve, for covering the front of the needle;

Wherein, a first spring pin is provided at the rear of the second outer sleeve, and a first limiting hole and a second limiting hole are respectively provided at the front and rear of the first outer sleeve. A spring pin can selectively cooperate with the first limiting hole and the second limiting hole.

Preferably, the liquid inlet check valve includes:

The end of the valve body is provided with a first connecting part, and an internal thread is provided on the inner circumference of the first connecting part, and the internal thread is matched with the external thread provided on the connecting seat, and the first connecting part is compatible with the The connecting seat is connected by threads, and a second connecting part is provided at the front end of the valve body, the outer circumference of the second connecting part matches the inner circumference of the mounting seat, and a valve is provided in the middle of the valve body. Cavity;

A valve seat, which is arranged in the valve cavity, has a central hole in the center of the valve seat, and a plurality of liquid inlet holes are evenly distributed on the outer periphery of the central hole;

A piston, the piston rod of which passes through the central hole, an umbrella-shaped end is provided at the end of the piston rod, and a limit block is provided at the front end of the piston;

Wherein, when the limiting block is in contact with the valve seat, the umbrella-shaped end is separated from the valve seat, and the liquid inlet check valve is in an open state; when the umbrella-shaped end is in contact with the valve seat , the umbrella-shaped end covers the liquid inlet hole, and the liquid inlet one-way valve is in a closed state.

Preferably, the liquid inlet check valve includes:

The end of the valve body is provided with a first connecting part, and an internal thread is provided on the inner circumference of the first connecting part, and the internal thread is matched with the external thread provided on the connecting seat, and the first connecting part is compatible with the The connecting seat is connected by threads, and a second connecting part is provided at the front end of the valve body, the outer circumference of the second connecting part matches the inner circumference of the mounting seat, and a valve is provided in the middle of the valve body. Cavity;

A pair of valve flaps, which are arranged in the valve cavity, the valve flaps are semi-conical, the base of the valve flaps is connected to the valve cavity, and the free ends of the valve flaps are attached to each other;

Wherein, the valve disc is made of elastic rubber material.

Preferably, matching tapers are provided on the outer circumference of the second connecting portion and the inner circumference of the mounting seat.

Preferably, it also includes:

a second spring pin disposed on the first connecting portion;

The third limiting hole is arranged at the end of the first outer sleeve and cooperates with the second spring pin to fix the first outer sleeve on the liquid inlet one-way valve.

Preferably, it also includes:

an annular groove, which is arranged in the middle of the valve body;

a spring, which is sleeved on the ring groove, and its end is fixedly connected to the first connecting part;

Wherein, when the second spring pin is inserted into the third limiting hole, the front end of the spring abuts against the rear end surface of the mounting seat, and the spring is in a compressed state; when the second spring pin is pressed down, the The second spring pin retracts to the outside of the third limiting hole, and the needle, the first outer sleeve and the second outer sleeve are separated from the liquid inlet one-way valve under the restoring force of the spring.

Preferably, it also includes:

A column, which is arranged at the front end of the second outer sleeve, is used to drive the second outer sleeve to move.

The beneficial effects of the present invention are: a first outer sleeve and a second outer sleeve are arranged on the periphery of the needle, and the second outer sleeve can move axially along the first outer sleeve, which can shield the needle and prevent medical personnel from being stabbed after blood collection ; A liquid inlet check valve is provided to avoid blood sample contamination; a spring is provided on the liquid inlet check valve, and the needle, the first outer sleeve and the second outer sleeve can automatically contact the inlet under the restoring force of the spring. Liquid one-way valve separation.

Description of drawings

Figure 1 is a schematic diagram of the invention of an arterial blood collection needle (needle fully covered state).

Fig. 2 is a schematic diagram of the invention of an arterial blood collection needle (needle half-shielded state).

Fig. 3 is a schematic diagram of the invented arterial blood collection needle (needle withdrawn state).

Fig. 4 is the schematic diagram I of the liquid inlet check valve in the invention.

Fig. 5 is a schematic diagram II of the liquid inlet check valve in the invention.

Fig. 6 is a schematic view of the first outer sleeve and the second outer sleeve in the invention.

detailed description

The invention will be further described in detail below in conjunction with the accompanying drawings, so that those skilled in the art can implement it with reference to the description.

It should be understood that terms such as "having", "comprising" and "including" used herein do not exclude the presence or addition of one or other elements or combinations thereof.

As shown in Figures 1-6, an implementation form of the present invention, in order to achieve the above purpose, the present invention adopts the following technical solutions, including:

Syringe body 110, its inside is provided with lumen 111, is provided with connecting seat 112 at the front end of described syringe body, is provided with the through hole 113 that communicates with described lumen 111 in described connecting seat 112; As a kind of preferred , the syringe body 110 body is made of polyethylene material. As a further preference, external threads are provided on the outer periphery of the connecting seat 112 .

The end of the liquid inlet check valve 120 is detachably connected to the connecting seat 112; The inner circumference of the part 121 is provided with an internal thread, and the internal thread is matched with the external thread provided on the connecting seat 112. The first connecting part 121 and the connecting seat 112 are connected by threads. The front end is provided with a second connecting portion 122, the outer circumference of the second connecting portion 122 matches the inner circumference of the mounting seat 121, and a valve chamber 123 is provided in the middle of the valve body; a valve seat 124 is arranged on the valve body. In the chamber 123, a central hole is provided at the center of the valve seat 124, and a plurality of liquid inlet holes 124a are evenly distributed on the outer periphery of the central hole; the piston rod of the piston 125 passes through the central hole, and the piston rod An umbrella-shaped end is provided at the end of the piston, and a limit block is provided at the front end of the piston; wherein, when the limit block abuts against the valve seat 124, the umbrella-shaped end is separated from the valve seat 124, and the advance The liquid one-way valve 120 is in an open state, and when the umbrella-shaped end is in contact with the valve seat, the umbrella-shaped end covers the liquid inlet hole, and the liquid-inlet one-way valve is in a closed state. As a further preference, the piston 125 is made of rubber material.

The end of the needle 130 is provided with a mounting seat 131, and the mounting seat 131 is detachably connected to the front end of the liquid inlet check valve; as a preference, the inner circumference of the mounting seat 131 is connected to the second connecting portion 122 match the perimeter. As a further preference, matching tapers are provided on the inner circumference of the mounting seat 131 and the outer circumference of the second connecting portion 122 .

The first outer sleeve 140 is arranged on the outer circumference of the needle 130, the inner diameter of the first outer sleeve 140 matches the outer circumference of the first connecting part 121, and the first outer sleeve 140 is fixedly connected with the mounting seat 131, The cover is arranged at the rear of the needle 130 . The second outer sleeve 150 is at least partly disposed inside the first outer sleeve 140 and can move along the axial direction of the first outer sleeve 140 . The circumference matches, and is used to cover the front part of the needle 130. As a preference, the first outer sleeve 140 and the second outer sleeve 150 are made of rubber material. As a further preference, a first spring pin 151 is provided at the rear of the second outer sleeve 150, and a first limiting hole 141 and a second limiting hole are respectively provided at the front and rear of the first outer sleeve 140. Position hole 142 , the first spring pin 151 can be selectively matched with the first limit hole 141 and the second limit hole 142 .

During use, first press down the first spring pin 151 to retract the first spring pin 151 out of the first limiting hole 141, then pull the second outer sleeve 150 to retract into the first outer sleeve 140, Until the first spring pin 151 reaches the position of the second limiting hole 142 and extends into the second limiting hole 142, at this time, the middle and front part of the needle is exposed, and blood collection can be carried out. After the blood collection is completed, press down the first spring pin 151 again , so that the first spring pin 151 is retracted to the outside of the second limiting hole 142, and the second outer sleeve 150 is pulled, so that the second outer sleeve 150 covers the front of the needle until the first spring pin 151 reaches the position of the first limiting hole 141 And extend into the first limiting hole 141 . Since there is a liquid inlet check valve between the needle 130 and the syringe body 110, blood extravasation or external air entry is avoided. When gas and blood analysis is required, the first connecting part 121 only needs to be rotated. The first connecting portion 121 is separated from the connecting base 112 .

In another embodiment, as shown in FIG. 4 , the liquid inlet check valve 120 includes: a first connection portion 121 is provided at the end of the valve body, and an internal thread is provided on the inner circumference of the first connection portion 121 . The internal thread matches the external thread provided on the connecting seat 112, the first connecting part 121 is threadedly connected with the connecting seat 112, and a second connecting part 122 is provided at the front end of the valve body. The outer circumference of the two connecting parts 122 matches the inner circumference of the mounting seat 121, and a valve chamber 123 is provided in the middle of the valve body; the valve seat 124 is arranged in the valve chamber 123, and the valve seat 124 center is provided with There is a central hole, and a plurality of liquid inlet holes 124a are evenly distributed on the periphery of the central hole; the piston rod of the piston 125 passes through the central hole, and an umbrella-shaped end is provided at the end of the piston rod, and the The front end of the piston is provided with a limit block; wherein, when the limit block is in contact with the valve seat 124, the umbrella-shaped end is separated from the valve seat 124, and the liquid inlet check valve 120 is in an open state. When the umbrella-shaped end abuts against the valve seat, the umbrella-shaped end covers the liquid inlet hole, and the liquid inlet one-way valve is in a closed state at 120 . As a preference, the piston 125 is made of rubber material.

In another embodiment, as shown in FIG. 5 , the liquid inlet check valve 120 includes: a first connection portion 121 is provided at the end of the valve body, and an internal thread is provided on the inner circumference of the first connection portion 121 . The internal thread matches the external thread provided on the connecting seat 112, the first connecting part 121 is threadedly connected with the connecting seat 112, and a second connecting part 122 is provided at the front end of the valve body. The outer circumference of the two connecting parts 122 matches the inner circumference of the mounting seat 121, and a valve cavity 123 is arranged in the middle of the valve body; a pair of valve flaps 126 are arranged in the valve cavity 123, and the valve flaps 126 is semi-conical, the base of the valve flap 126 is connected to the valve chamber 123, and the free ends of the valve flap 126 are attached to each other; wherein, the valve flap 126 is made of elastic rubber material.

In another embodiment, matching tapers are provided on the outer circumference of the second connecting portion 122 and the inner circumference of the mounting seat 131 . As a preference, the taper is 8°.

In another embodiment, it also includes: the second spring pin 127 is set on the first connecting part 121; the third limiting hole 143 is set at the end of the first outer sleeve 140, and is connected with the second The spring pin 127 cooperates to fix the first outer sleeve 140 on the liquid inlet check valve 120 .

In another embodiment, it also includes: an annular groove 128 disposed in the middle of the valve body; a spring 129 sleeved on the annular groove 128, and the end of the spring 129 is fixedly connected to the first connecting portion 121; Wherein, when the second spring pin 127 is inserted into the third limiting hole 143, the front end of the spring 129 abuts against the rear end surface of the mounting seat 131, and the spring 129 is in a compressed state; the second spring is pressed down pin 127, the second spring pin 127 retracts to the outside of the third limiting hole 143, the needle 130, the first outer sleeve 140 and the second outer sleeve 150 contact the liquid inlet unit under the restoring force of the spring 129 to valve 120.

In another embodiment, it further includes: a column 152 arranged at the front end of the second outer sleeve 150 for driving the second outer sleeve 150 to move. As a preference, the column 152 is integrally formed with the second outer sleeve 150 .

In summary, the arterial blood collection needle 1 of the present invention is provided with a first outer sleeve 140 and a second outer sleeve 150 on the periphery of the needle 130, and the second outer sleeve 150 can move axially along the first outer sleeve 140, The needle can be shielded to avoid being stabbed by the medical staff after blood collection; a liquid inlet check valve 120 is provided to avoid blood sample contamination; a spring 129 is provided on the liquid inlet check valve 120, and the needle 130, the first outer sleeve 140 and the second outer sleeve 150 can be automatically separated from the liquid inlet check valve 120 under the restoring force of the spring 129 .

Although the embodiment of the present invention has been disclosed as above, it is not limited to the use listed in the specification and implementation, it can be applied to various fields suitable for the present invention, and it can be easily understood by those skilled in the art Therefore, the invention is not limited to the specific details and examples shown and described herein without departing from the general concept defined by the claims and their equivalents.

Claims (5)

1. An arterial blood collection needle, characterized in that, comprising: The syringe body is provided with a lumen inside, and a connecting seat is provided at the front end of the syringe body, and a through hole communicating with the lumen is provided in the connecting seat; a liquid inlet check valve, the end of which is detachably connected to the connecting seat; and A needle, the end of which is provided with a mounting seat, the mounting seat is detachably connected to the front end of the liquid inlet check valve, and the end of the valve body of the liquid inlet check valve is provided with a first connecting portion; The first outer sleeve is arranged on the outer circumference of the needle, the inner diameter of the first outer sleeve matches the outer circumference of the first connecting part, the first outer sleeve is fixedly connected with the mounting seat, and the first outer sleeve is fixedly connected to the mounting seat. The front part and the rear part of an outer sleeve are respectively provided with a first limit hole and a second limit hole, and the first outer sleeve is used to cover the rear part of the needle; a second outer sleeve, which is at least partially disposed inside the first outer sleeve and can move axially along the first outer sleeve, the outer circumference of the second outer sleeve matches the inner circumference of the first outer sleeve, and The rear part of the second outer sleeve is provided with a first spring pin that can selectively cooperate with the first limit hole and the second limit hole, and the second outer sleeve is used to cover the front part of the needle ; a second spring pin disposed on the first connecting portion; A third limiting hole, which is arranged at the end of the first outer sleeve and cooperates with the second spring pin, and is used to fix the first outer sleeve on the liquid inlet check valve; an annular groove, which is arranged in the middle of the valve body; a spring, which is sleeved on the ring groove, and its end is fixedly connected to the first connecting part; Wherein, when the second spring pin is inserted into the third limiting hole, the front end of the spring abuts against the rear end surface of the mounting seat, and the spring is in a compressed state; when the second spring pin is pressed down, the The second spring pin retracts to the outside of the third limiting hole, and the needle, the first outer sleeve and the second outer sleeve are separated from the liquid inlet one-way valve under the restoring force of the spring. 2. The arterial blood collection needle according to claim 1, wherein the liquid inlet check valve comprises: The end of the valve body is provided with a first connecting part, and an internal thread is provided on the inner circumference of the first connecting part, and the internal thread is matched with the external thread provided on the connecting seat, and the first connecting part is compatible with the The connecting seat is connected by threads, and a second connecting part is provided at the front end of the valve body, the outer circumference of the second connecting part matches the inner circumference of the mounting seat, and a valve is provided in the middle of the valve body. Cavity; A valve seat, which is arranged in the valve cavity, has a central hole in the center of the valve seat, and a plurality of liquid inlet holes are evenly distributed on the outer periphery of the central hole; a piston, the piston rod of which passes through the central hole, an umbrella-shaped end is provided at the end of the piston rod, and a limit block is provided at the front end of the piston; Wherein, when the limiting block is in contact with the valve seat, the umbrella-shaped end is separated from the valve seat, and the liquid inlet check valve is in an open state; when the umbrella-shaped end is in contact with the valve seat , the umbrella-shaped end covers the liquid inlet hole, and the liquid inlet one-way valve is in a closed state. 3. The arterial blood collection needle according to claim 1, wherein the liquid inlet check valve comprises: The end of the valve body is provided with a first connecting part, and an internal thread is provided on the inner circumference of the first connecting part, and the internal thread is matched with the external thread provided on the connecting seat, and the first connecting part is compatible with the The connecting seat is connected by threads, and a second connecting part is provided at the front end of the valve body, the outer circumference of the second connecting part matches the inner circumference of the mounting seat, and a valve is provided in the middle of the valve body. Cavity; A pair of valve flaps, which are arranged in the valve cavity, the valve flaps are semi-conical, the base of the valve flaps is connected to the valve cavity, and the free ends of the valve flaps are attached to each other; Wherein, the valve disc is made of elastic rubber material. 4. The arterial blood collection needle according to claim 2 or 3, characterized in that: a matching taper is provided on the outer circumference of the second connecting portion and the inner circumference of the mounting seat. 5. The arterial blood collection needle according to claim 1, further comprising: A column, which is arranged at the front end of the second outer sleeve, is used to drive the second outer sleeve to move.

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