Blood gas analysis blood lancet

Abstract

The utility model discloses a blood gas analysis blood taking needle relates to medical tool field, provide a kind of blood gas analysis blood taking needle, which can both puncture into blood vessel to carry out blood sampling, and can be connected with venous blood taking needle to carry out blood sampling. The blood gas analysis blood taking needle includes needle cylinder, needle cylinder includes needle cylinder main body, center tube and connecting sleeve, the front end of center tube is connected with needle cylinder main body, and connecting sleeve is coaxially arranged with center tube and located the outside of center tube;It also includes needle cylinder end cover and puncture needle;Needle cylinder end cover includes end cover main body and silica gel sheet, and the end cover main body is provided with conical hole and connecting hole, which are coaxially arranged from back to front in sequence, the silica gel sheet is arranged at the bottom end of conical hole, the rear part of end cover main body is located between connecting sleeve and center tube and is threadedly connected with connecting sleeve, the side surface of conical hole is attached with center tube, and the front end surface of silica gel sheet is attached with center tube;Puncture needle includes coaxially arranged connecting cover and needle body, connecting cover covers needle cylinder end cover and is threadedly connected with connecting sleeve, and needle body pierces silica gel sheet.

Description

Technical Field

[0001] This utility model relates to the field of medical tools, and in particular to a blood collection needle for blood gas analysis. Background Technology

[0002] Blood gas analysis is a method that uses a blood gas analyzer to measure the concentration of H+ ions and dissolved gases (mainly CO2 and O2) in human blood to understand the body's respiratory function and acid-base balance. It directly reflects lung gas exchange function and acid-base balance. Arterial blood is the most commonly used sample in blood gas analysis; venous blood gas analysis is less frequently used clinically. However, venous blood gas analysis can often detect tissue hypoxia and perfusion earlier than arterial blood gas analysis. For example, in critically ill patients, including those with respiratory failure, venous blood gas analysis can detect the accumulation of carbon dioxide in the blood, leading to hypercapnia, earlier. In patients with traumatic brain injury, venous blood gas analysis can also sensitively assess the balance of cerebral oxygen supply and demand. The clinical application of venous blood gas analysis is gradually expanding, working alongside arterial blood gas analysis to aid in disease diagnosis, monitoring, and treatment.

[0003] Blood gas analysis requires not only a blood gas analyzer but also a blood gas scavenging needle. Similar to a regular syringe, the blood gas scavenging needle consists of a syringe barrel and a puncture needle. The syringe barrel comprises a main body, a central tube, and a connecting sleeve. The central tube is frustoconical and connects to the front end of the main body. The connecting sleeve is coaxial with the central tube and located outside it. The connecting part at the rear end of the puncture needle is threaded to a connecting cap and seals against the central tube. When using the blood gas scavenging needle, it is typically done similarly to a regular syringe: the puncture needle is inserted into a blood vessel to draw blood. After blood is drawn, the puncture needle is removed, and a sealing cap is used to seal the front end of the syringe barrel. The blood gas scavenging needle is then taken to the blood gas analyzer, the sealing cap is removed, and the front end of the syringe barrel is connected to the analyzer. The blood gas analyzer then performs the analysis. The connecting sleeve and central tube are compatible with the connection structure of the blood gas analyzer.

[0004] When patients undergo blood gas analysis using venous blood, they often need to have additional venous blood drawn for other tests. Therefore, a venous blood collection needle is usually already inserted into the patient's body for this purpose. Patent applications 201520719805.1, 202120694971.6, and 202010407776.0 all disclose such venous blood collection needles. In this case, although the blood gas analysis needle can still be inserted into a vein for blood collection, if a venous blood collection needle could be used for venous blood gas analysis, the patient would suffer one less puncture pain. However, current blood gas analysis needles are not compatible with venous blood collection needles, making it difficult to achieve venous blood gas analysis using a venous blood collection needle. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a blood gas analysis needle that can be both inserted into a blood vessel for blood collection and connected to a venous blood collection needle for blood collection.

[0006] The technical solution adopted to solve the above problems is as follows: the blood gas analysis blood collection needle includes a syringe, which includes a syringe body, a central tube, and a connecting sleeve. The central tube is frustoconical in shape and is connected to the front end of the syringe body. The connecting sleeve is coaxially arranged with the central tube and located outside the central tube. It also includes a syringe end cap and a puncture needle. The syringe end cap includes an end cap body and a silicone sheet. The end cap body has a conical hole and a connecting hole arranged coaxially from back to front. The silicone sheet is located at the bottom end of the conical hole. The rear part of the end cap body is located between the connecting sleeve and the central tube and is threadedly connected to the connecting sleeve. The conical hole fits against the side of the central tube, and the silicone sheet fits against the front end face of the central tube. The puncture needle includes a connecting cap and a needle body arranged coaxially. The connecting cap covers the syringe end cap and is threadedly connected to the connecting sleeve. The needle body punctures the silicone sheet.

[0007] Furthermore, the connecting hole is tapered, wider at the front and narrower at the back.

[0008] Furthermore, the diameter of the rear end of the connecting hole is equal to the diameter of the inner hole of the central tube.

[0009] Furthermore, the blood gas analysis lancet includes a needle cap that covers the puncture needle.

[0010] Furthermore, the rear end of the needle cap is fitted onto the connecting cover, which has a groove arranged in the front-to-back direction. The rear end of the needle cap has a protrusion arranged in the front-to-back direction, and the protrusion is embedded in the groove so that the needle cap can drive the puncture needle to rotate.

[0011] Furthermore, the front end of the needle cap has a support plate, which allows the needle cap to stand upright stably.

[0012] Furthermore, the blood gas analysis needle includes a sealing cap, which covers the syringe end cap and is threadedly connected to the connecting sleeve when the puncture needle is removed.

[0013] The beneficial effects of this invention are: This invention allows for routine puncture into blood vessels for blood gas analysis, with the specific operation being the same as existing technologies, simply inserting the puncture needle into the blood vessel. This invention can also be connected to a venous blood collection needle for blood gas analysis; the specific operation involves removing the puncture needle and then piercing the silicone sheet with the venous blood collection needle.

[0014] This invention expands the application range of blood collection needles for blood gas analysis. When collecting venous blood for blood gas analysis, it uses venous blood collection needles that are already inserted into the patient's body to collect blood, eliminating the need for additional punctures, reducing patient pain, and speeding up the blood collection process for blood gas analysis. Attached Figure Description

[0015] Figure 1 This is a structural diagram of a blood collection needle used for blood gas analysis;

[0016] Figure 2 This is a magnified view of the front of a blood collection needle used for blood gas analysis;

[0017] Figure 3 This is a diagram of the front structure of the syringe;

[0018] Figure 4 This is a structural diagram of the syringe end cap;

[0019] Figure 5 This is a diagram of the puncture needle structure;

[0020] Figure 6 This is a diagram of the needle cap structure;

[0021] Figure 7 This is a diagram of the closed-end structure;

[0022] Figure 8 This is a diagram showing the blood collection status when the blood collection needle for blood gas analysis is connected to the venous blood collection needle.

[0023] Figure 9 This is a diagram showing the usage status of the closed cap;

[0024] The following components are marked in the diagram: syringe 1, syringe body 11, central tube 12, connecting sleeve 13, syringe end cap 2, end cap body 21, conical hole 211, connecting hole 212, silicone sheet 22, puncture needle 3, connecting cap 31, needle body 32, needle cap 4, support plate 41, sealing cap 5, and venous blood collection needle 6. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0026] like Figures 1 to 7As shown, the blood gas analysis lancet includes a syringe 1, which comprises a syringe body 11, a central tube 12, and a connecting sleeve 13. The central tube 12 is frustoconical in shape and is connected to the front end of the syringe body 11. The connecting sleeve 13 is coaxially arranged with the central tube 12 and located outside the central tube 12. The lancet also includes a syringe end cap 2 and a puncture needle 3. The syringe end cap 2 comprises an end cap body 21 and a silicone sheet 22. The end cap body 21 has conical holes 21 arranged coaxially from back to front. 1. A connecting hole 212 is provided, and a silicone sheet 22 is provided at the bottom end of the conical hole 211. The rear part of the end cap body 21 is located between the connecting sleeve 13 and the central tube 12 and is threadedly connected to the connecting sleeve 13. The conical hole 211 is fitted with the side of the central tube 12, and the silicone sheet 22 is fitted with the front end face of the central tube 12. The puncture needle 3 includes a connecting cover 31 and a needle body 32 arranged coaxially. The connecting cover 31 covers the syringe end cap 2 and is threadedly connected to the connecting sleeve 13. The needle body 32 punctures the silicone sheet 22.

[0027] This invention allows for routine puncture into blood vessels for blood gas analysis, with the specific operation similar to existing technologies, involving inserting the puncture needle 3 into the blood vessel. Figure 8 As shown, this utility model can also be connected to the venous blood collection needle 6 for blood gas analysis. The specific operation is to remove the puncture needle 3 and puncture the silicone sheet with the venous blood collection needle 6.

[0028] This invention expands the application range of blood collection needles for blood gas analysis. When collecting venous blood for blood gas analysis, the blood collection needle 6, which is usually already punctured in the patient's body, is used for blood collection, eliminating the need for additional punctures, reducing patient pain, and speeding up the blood collection process for blood gas analysis.

[0029] The syringe 1 of this invention is completely identical to the prior art, with the main improvement being the addition of a syringe end cap 2 and a change in the puncture needle 3. Since the syringe 1 is identical to the prior art, it does not affect the connection between the syringe 1 and existing blood gas analyzers. The syringe end cap 2 is used to connect with the venous blood collection needle 6. The silicone sheet 22 is a structure found on many existing medical devices, such as heparin caps and blood collection tubes. The needle puncturing the silicone sheet 22 allows communication between the needle and the medical device. The elasticity of the silicone sheet 22 ensures a seal between the silicone sheet 22 and the needle when the needle punctures it. The venous blood collection needle 6 passes through the connecting hole 212, punctures the silicone sheet 22, and enters the inner hole of the central tube 12.

[0030] The connecting hole 212 is used for the passage of the venous blood collection needle 6. Its preferred structure is that the connecting hole 212 is tapered, wider at the front and narrower at the back, with the diameter of the rear end of the connecting hole 212 equal to the diameter of the inner hole of the central tube 12. This facilitates the insertion of the venous blood collection needle 6 into the connecting hole 212. After insertion, the connecting hole 212 guides the venous blood collection needle to align with the inner hole of the central tube 12, ensuring that the venous blood collection needle 6 penetrates the silicone sheet 22 and enters the inner hole of the central tube 12.

[0031] The blood gas analysis lancet should include a needle cap 4, which covers the puncture needle 3. The function of the needle cap 4 is to cover the puncture needle 3 when the blood gas analysis lancet is not in use, preventing the puncture needle 3 from puncturing the packaging and causing injury. Specifically, the rear end of the needle cap 4 is fitted onto a connecting cap 31, which has a groove in the front-to-back direction. The rear end of the needle cap 4 has a protrusion in the front-to-back direction, which fits into the groove, allowing the needle cap 4 to rotate the puncture needle 3. Thus, for ordinary blood collection by puncturing a blood vessel, the needle cap 4 can be directly removed by sliding it horizontally. For blood collection connected to a venous blood collection needle 6, the needle cap 4 is rotated, causing the puncture needle 3 to rotate, and the puncture needle 3 can be detached.

[0032] The preferred needle cap 4 has a supporting plate 41 at its front end, which allows the needle cap 4 to stand upright stably. The significance of this design is that after the needle cap 4 is removed and placed upright, the puncture needle 3 can be inserted into the needle cap 4 after blood collection without holding the needle cap 4, thus achieving the re-attaching of the needle cap 4 and avoiding needle puncture injury after blood collection.

[0033] During the process of moving the blood collection needle to the blood gas analyzer for blood gas analysis after blood collection, the syringe end cap 2 serves to prevent blood leakage. However, for greater reliability, it is preferable that the blood collection needle for blood gas analysis includes a sealing cap 5. When the puncture needle 3 is removed, the sealing cap 5 can cover the syringe end cap 2 and be threadedly connected to the connecting sleeve 13.

[0034] After blood collection, use the sealing cap 5 and connecting sleeve 13 to thread and cover the syringe end cap 2. When the blood gas analysis needle is moved to the blood gas analyzer, remove the sealing cap 5 and syringe end cap 2, and the syringe 1 can be connected to the blood gas analyzer. The front of the end cap body 21 exposes the connecting sleeve 13. By holding the exposed part of the end cap body 21 and rotating it, it can be removed.

Claims

1. A blood gas analysis needle, comprising a syringe (1), the syringe (1) comprising a syringe body (11), a central tube (12) and a connecting sleeve (13), the central tube (12) being frustoconical in shape, the central tube (12) being connected to the front end of the syringe body (11), and the connecting sleeve (13) being coaxially arranged with the central tube (12) and located outside the central tube (12); characterized in that: The device includes a syringe end cap (2) and a puncture needle (3). The syringe end cap (2) includes an end cap body (21) and a silicone sheet (22). The end cap body (21) has a conical hole (211) and a connecting hole (212) arranged coaxially from back to front. The silicone sheet (22) is located at the bottom end of the conical hole (211). The rear part of the end cap body (21) is located between the connecting sleeve (13) and the central tube (12) and is threadedly connected to the connecting sleeve (13). The conical hole (211) fits against the side of the central tube (12), and the silicone sheet (22) fits against the front end face of the central tube (12). The puncture needle (3) includes a connecting cover (31) and a needle body (32) arranged coaxially. The connecting cover (31) covers the syringe end cap (2) and is threadedly connected to the connecting sleeve (13). The needle body (32) punctures the silicone sheet (22).

2. The blood collection needle for blood gas analysis according to claim 1, characterized in that: The connecting hole (212) is tapered, with a larger front and a smaller back.

3. The blood collection needle for blood gas analysis according to claim 2, characterized in that: The diameter of the rear end of the connecting hole is equal to the diameter of the inner hole of the central tube (12).

4. The blood collection needle for blood gas analysis according to claim 3, characterized in that: Includes a needle cap (4), which covers the puncture needle (3).

5. The blood collection needle for blood gas analysis according to claim 4, characterized in that: The rear end of the needle cap (4) is fitted onto the connecting cover (31). The connecting cover (31) has a groove arranged in the front-to-back direction. The rear end of the needle cap (4) has a protrusion arranged in the front-to-back direction. The protrusion is embedded in the groove so that the needle cap (4) can drive the puncture needle (3) to rotate.

6. The blood collection needle for blood gas analysis according to claim 5, characterized in that: The front end of the needle cap (4) has a support plate (41), which enables the needle cap (4) to stand upright stably.

7. The blood collection needle for blood gas analysis according to claim 6, characterized in that: Including the sealing cap (5), when the puncture needle (3) is removed, the sealing cap (5) can cover the syringe end cap (2) and be threadedly connected to the connecting sleeve (13).

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