Negative pressure structure for emptying air in blood taking needle

Abstract

The negative pressure structure comprises a blood collecting needle and a vacuum bag, the blood collecting needle comprises a needle handle, a needle tube, a sleeve and the vacuum bag, the sleeve is made of a flexible film material, the needle tube is arranged in the sleeve, and the needle tube and the sleeve are fixed to the end face of the needle handle. A fixing part A and a fixing part B are arranged at the two ends of the vacuum bag respectively and are made of hard materials, the fixing part A is provided with a bag inlet, the bag inlet is provided with an inner film, the fixing part B is provided with a bag outlet, and the bag outlet is provided with an outer film. The lower end of the sleeve is fixed to the fixing piece A. The needle tube, the bag inlet and the bag outlet are located on the same vertical line. The tip end of the needle tube can pierce the inner membrane to enter the cavity of the vacuum bag, air in the blood taking needle is emptied through the vacuum bag, it is ensured that an existing vacuum blood taking tube can be filled with 2 ml of blood, and waste caused by discarding of the first blood taking tube which is not filled with blood is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of medical appliances, in particular to a negative pressure structure for exhausting air from a blood collection needle. Background Art

[0002] The split blood collection needle is a disposable blood collection needle commonly used in clinical practice, and is usually used in conjunction with a vacuum blood collection tube. The existing blood collection needle includes a venipuncture needle and a blood collection needle, and the tail end of the venipuncture needle catheter is provided with a needle seat for connecting the blood collection needle.

[0003] When collecting blood, medical staff insert the venous puncture needle into the patient's skin, and then insert the blood collection needle into the sealing plug of the vacuum blood collection tube, drain the blood through the vacuum negative pressure, and collect the blood into the blood collection tube. Because there is air in the blood collection needle, the blood collection in the first blood collection tube is unqualified, and medical staff usually discard the first vacuum blood collection tube, resulting in waste.

[0004] Therefore, how to design a negative pressure structure for exhausting the air in a blood collection needle has become an urgent problem to be solved in the field of medical devices. Summary of the invention

[0005] The purpose of the present invention is to provide a negative pressure structure for evacuating the air in a blood collection needle. The air in the blood collection needle is evacuated by a vacuum bag to ensure that 2 ml of blood can be collected in the existing vacuum blood collection tube, thereby avoiding the waste caused by discarding the first blood collection tube due to insufficient blood collection.

[0006] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solutions: A negative pressure structure for evacuating the air in a blood collection needle comprises a blood collection needle and a vacuum bag. The blood collection needle comprises a needle handle, a needle tube, a sleeve and a vacuum bag. The sleeve is made of a flexible film material. The needle tube is arranged in the sleeve, and the needle tube and the sleeve are fixed to the end face of the needle handle. A fixing piece and a B fixing piece are respectively arranged at both ends of the vacuum bag. Both the A fixing piece and the B fixing piece are made of hard materials. The A fixing piece is provided with a bag entrance, and the bag entrance is provided with an inner membrane, which closes the bag entrance. The B fixing piece is provided with a bag exit, and the bag exit is provided with an outer membrane, which closes the bag exit. The lower end of the sleeve is fixed on the A fixing piece. The needle tube, the bag entrance and the bag exit are on the same vertical line. The tip of the needle tube can pierce the inner membrane to enter the vacuum bag cavity, and the blood is drained by vacuum negative pressure to evacuate the air in the blood collection needle. The tip of the needle tube can pierce the outer membrane and extend out of the vacuum bag.

[0007] Compared with the prior art, the negative pressure structure for exhausting the air in the blood collection needle using the above technical solution has the following beneficial effects: 1. The negative pressure structure for evacuating the air in the blood collection needle of the present invention is adopted. When collecting blood, the medical staff pulls up the cannula, drives the tip of the needle tube to poke the vacuum bag until it pierces the inner membrane and enters the vacuum bag cavity, and drains about 0.5 ml of blood through the vacuum negative pressure; then the needle handle is held to align the outer membrane with the sealing plug of the existing vacuum blood collection tube, and the tip of the needle tube pierces the outer membrane and enters the blood collection tube, so that the blood is collected in the blood collection tube. The air in the blood collection needle is evacuated by the vacuum bag, ensuring that 2 ml of blood can be collected in the blood collection tube, avoiding the waste caused by the first blood collection tube being discarded because it is not full of blood.

[0008] Second, the A fixing piece and the B fixing piece are not easy to be deformed, and the medical staff can clearly see the position of the A fixing piece and the B fixing piece with the naked eye. The needle can be easily aligned with the sac entrance and the sac exit, thereby increasing the success rate of the needle piercing the inner membrane and the outer membrane.

[0009] 3. In the preferred embodiment, the needle handle, the spring and the A fixing member are connected in sequence to form a whole, so as to prevent the spring from being separated from the sac entrance and ensure that the needle tube successfully pierces the inner membrane.

[0010] Preferably, the sleeve is provided with a plurality of fold lines, which are arranged around the sleeve in a circle, and the plurality of fold lines are arranged along the length direction of the sleeve, so that the sleeve can be folded to shorten its length. The fold lines make it easier to pull the sleeve so that the needle tip can penetrate into the vacuum bag.

[0011] Preferably, a spring is provided in the sleeve, the spring spirally surrounds the outer circumference of the needle tube, and the two ends of the spring are respectively fixed to the end surface of the needle handle and the A fixing piece, and the spring expansion and contraction direction is the same as the length direction of the needle tube. When the sleeve is folded, the spring is compressed, and when the sleeve is unfolded, the spring is reset. The spring supports the sleeve, maintains the distance between the needle tube tip and the inner membrane, and prevents the needle tube tip from accidentally puncturing the inner membrane.

[0012] Preferably, the shape of the fixing piece A is an inverted hollow cone without a top, the capsule entrance is arranged on the fixing piece A, and a through hole is arranged below the fixing piece A, and the cavity of the fixing piece A is connected with the cavity of the vacuum capsule through the through hole. The tip of the needle tube pierces the inner membrane and enters the cavity of the fixing piece A, and the outer wall of the fixing piece A separates the needle tube and the wall of the vacuum capsule to prevent the needle tube from accidentally puncturing the wall of the vacuum capsule.

[0013] Preferably, the shape of the B fixing piece is a straight tube, the capsule outlet is arranged below the B fixing piece, the diameter of the B fixing piece is larger than the outer diameter of the lower end of the A fixing piece, and the lower end of the A fixing piece can be placed in the B fixing piece. The outer diameter of the A fixing piece gradually decreases from top to bottom, and the outer wall of the A fixing piece plays a transitional role, so that the lower end of the A fixing piece is easier to be placed in the B fixing piece. The lower end of the A fixing piece is placed in the B fixing piece, which can improve the space utilization rate and make the needle tube that pierces the outer membrane and extends out of the vacuum capsule longer.

[0014] Preferably, the inner membrane is made of thick rubber material. The inner membrane is thicker to prevent the needle tip from accidentally puncturing the inner membrane.

[0015] Preferably, the outer membrane is made of thin rubber material. The outer membrane is thinner, so that the needle tip can pierce the outer membrane more easily.

[0016] Preferably, the capacity of the vacuum bag cavity is not less than 0.5 ml, and the vacuum bag cavity is sufficient to accommodate 0.5 ml of blood and exhaust the air in the blood collection needle. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the structure of the blood collection needle in the embodiment.

[0018] Figure 2 Schematic diagram of the structure of the blood collecting needle in the embodiment.

[0019] Figure 3 It is the front view of the blood collecting needle in the embodiment.

[0020] Figure 4 It is a cross-sectional view of the blood collecting needle when the needle tube has not punctured in the embodiment.

[0021] Figure 5 It is a cross-sectional view of the blood collecting needle when the needle tube punctures into the cyst cavity in the embodiment.

[0022] Figure 6 It is a schematic diagram of the structure of the blood collecting needle when the needle tube punctures the cyst cavity in the embodiment.

[0023] Figure 7 It is a cross-sectional view of the blood collecting needle when the needle tube punctures the cyst cavity in the embodiment.

[0024] Figure numerals: 1. venous puncture needle; 11. catheter; 12. needle seat; 2. blood collecting needle; 21. needle tube; 22. needle handle; 23. cannula; 24. fold line; 25. spring; 3. A fixing piece; 31. sac entrance; 32. inner membrane; 33. through port; 4. B fixing piece; 41. sac exit; 42. outer membrane; 5. vacuum sac; 50. sac cavity. DETAILED DESCRIPTION

[0025] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0026] like Figures 1 to 7The negative pressure structure shown in the figure for exhausting the air in the blood collection needle comprises a blood collection needle 2 and a vacuum bag 5. The blood collection needle 2 comprises a needle handle 22, a needle tube 21, a sleeve 23 and a vacuum bag 5. The sleeve 23 is made of a flexible film material. The needle tube 21 is arranged in the sleeve 23, and the needle tube 21 and the sleeve 23 are fixed to the end surface of the needle handle 22. A fixing part 3 and a fixing part 4 are respectively arranged at both ends of the vacuum bag 5. The fixing parts 3 and 4 are both made of hard materials. The fixing part 3 is provided with a bag inlet 31. The bag inlet 31 is provided with an inner membrane 32. The inner membrane 32 closes the bag inlet 31. The fixing part 4 is provided with a bag outlet 41. The bag outlet 41 is provided with an outer membrane 42. The outer membrane 42 closes the bag outlet 41. Figure 4 As shown, the lower end of the sleeve 23 is fixed on the A fixing member 3, and the needle tube 21, the capsule inlet 31 and the capsule outlet 41 are on the same vertical line; Figure 5 As shown, the tip of the needle tube 21 can pierce the inner membrane 32 and enter the cavity 50 of the vacuum bag 5, and drain the blood through the vacuum negative pressure to evacuate the air in the blood collection needle; Figure 7 As shown, the tip of the needle tube 21 can pierce the outer membrane 42 and extend out of the vacuum bag 5. When collecting blood, the medical staff pulls the sleeve 23, driving the tip of the needle tube 21 to poke the vacuum bag 5 until it pierces the inner membrane 32 and enters the vacuum bag 5 cavity 50, and drains about 0.5 ml of blood through the vacuum negative pressure; then hold the needle handle 22 to align the outer membrane 42 with the existing vacuum blood collection tube sealing plug, and pierce the tip of the needle tube 21 through the outer membrane 42 to enter the blood collection tube, so that the blood is collected in the blood collection tube. The air in the blood collection needle is emptied through the vacuum bag 5 to ensure that 2 ml of blood can be collected in the blood collection tube, avoiding the first blood collection tube being discarded due to insufficient blood collection and causing waste.

[0027] Among them, the A fixing member 3 and the B fixing member 4 are not easy to deform, and the medical staff can clearly see the positions of the A fixing member 3 and the B fixing member 4 with the naked eye. The needle tube 21 is easier to align with the sac inlet 31 and the sac outlet 41, thereby improving the success rate of the needle tube 21 piercing the inner membrane 32 and the outer membrane 42.

[0028] Reference Figure 3 The sleeve 23 is provided with a plurality of fold lines 24, which are arranged around the sleeve 23, and the plurality of fold lines 24 are arranged along the length direction of the sleeve 23, so that the sleeve 23 can be folded to shorten the length. The fold lines make it easier to pull the sleeve 23 so that the tip of the needle tube 21 can penetrate into the vacuum bag 5.

[0029] Reference Figures 4 to 7,, a spring 25 is arranged inside the sleeve 23, and the spring 25 is spirally wound around the outer circumference of the needle tube 21. The two ends of the spring 25 are respectively fixed to the end surface of the needle handle 22 and the A fixing piece 3. The extension direction of the spring 25 is the same as the length direction of the needle tube 21. When the sleeve 23 is folded, the spring 25 is compressed, and when the sleeve 23 is unfolded, the spring 25 is reset. The spring 25 supports the sleeve 23, maintains the distance between the tip of the needle tube 21 and the inner membrane 32, and prevents the tip of the needle tube 21 from accidentally puncturing the inner membrane 32. The needle handle 22, the spring 25 and the A fixing piece 3 are connected in sequence to form a whole, preventing the spring 25 from detaching from the capsule entrance 31, and ensuring that the needle tube 21 successfully pierces the inner membrane 32.

[0030] The shape of the A fixing part 3 is an inverted hollow cone without a top, the capsule entrance 31 is arranged on the A fixing part 3, and a through hole 33 is arranged on the A fixing part 3. The cavity of the A fixing part 3 is connected with the capsule cavity 50 of the vacuum capsule 5 through the through hole 33. The tip of the needle tube 21 pierces the inner membrane 32 and enters the cavity of the A fixing part 3. The outer wall of the A fixing part 3 separates the needle tube 21 and the capsule wall of the vacuum capsule 5 to prevent the needle tube 21 from accidentally puncturing the capsule wall of the vacuum capsule 5.

[0031] Among them, the shape of the B fixing member 4 is a straight tube, and the capsule outlet 41 is arranged below the B fixing member 4. The diameter of the B fixing member 4 is larger than the outer diameter of the lower end of the A fixing member 3, and the lower end of the A fixing member 3 can be placed in the B fixing member 4. The outer diameter of the A fixing member 3 gradually decreases from top to bottom, and the outer wall of the A fixing member 3 plays a transitional role, so that the lower end of the A fixing member 3 is easier to be placed in the B fixing member 4. The lower end of the A fixing member 3 is placed in the B fixing member 4, which can improve the space utilization rate and make the needle tube 21 that pierces the outer membrane 42 and extends out of the vacuum capsule 5 longer.

[0032] The inner membrane 32 is made of thick rubber material. The inner membrane 32 is thicker to prevent the tip of the needle tube 21 from accidentally puncturing the inner membrane 32. The outer membrane 42 is made of thin rubber material. The outer membrane 42 is thinner to make it easier for the tip of the needle tube 21 to puncture the outer membrane 42. The capacity of the cavity 50 of the vacuum bag 5 is not less than 0.5 ml. The cavity 50 of the vacuum bag 5 is enough to accommodate 0.5 ml of blood and empty the air in the blood collection needle.

[0033] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A negative pressure structure for exhausting air from a blood collection needle, characterized in that: The invention comprises a blood collecting needle (2) and a vacuum bag (5), wherein the blood collecting needle (2) comprises a needle handle (22), a needle tube (21), a sleeve (23) and the vacuum bag (5), wherein the sleeve (23) is made of a flexible film material, the needle tube (21) is arranged in the sleeve (23), and the needle tube (21) and the sleeve (23) are fixed to the end surface of the needle handle (22). The vacuum bag (5) is provided with an A fixing member (3) and a B fixing member (4) at both ends, the A fixing member (3) and the B fixing member (4) are both made of hard materials, the A fixing member (3) is provided with a bag inlet (31), the bag inlet (31) is provided with an inner membrane (32) for closing the bag inlet (31), the B fixing member (4) is provided with a bag outlet (41), the bag outlet (41) is provided with an outer membrane (42) for closing the bag outlet (41), The lower end of the sleeve (23) is fixed on the A fixing member (3); the needle tube (21), the bag inlet (31) and the bag outlet (41) are located on the same vertical line; the tip of the needle tube (21) can pierce the inner membrane (32) and enter the bag cavity (50) of the vacuum bag (5), and drain the blood through the vacuum negative pressure to evacuate the air in the blood collection needle; the tip of the needle tube (21) can pierce the outer membrane (42) and extend out of the vacuum bag (5).

2. The negative pressure structure for exhausting air from a blood collection needle according to claim 1, characterized in that: The sleeve (23) is provided with a plurality of fold lines (24), the fold lines (24) are arranged around the sleeve (23), and the plurality of fold lines (24) are arranged along the length direction of the sleeve (23), so that the sleeve (23) can be folded to shorten its length.

3. The negative pressure structure for exhausting air from a blood collection needle according to claim 1, characterized in that: A spring (25) is arranged inside the sleeve (23), and the spring (25) is spirally wound around the outer circumference of the needle tube (21). Two ends of the spring (25) are respectively fixed to the end surface of the needle handle (22) and the A fixing member (3). The expansion and contraction direction of the spring (25) is the same as the length direction of the needle tube (21).

4. The negative pressure structure for exhausting air from a blood collection needle according to claim 1, characterized in that: The A fixing member (3) is in the shape of an inverted hollow cone without a top, the capsule inlet (31) is arranged on the A fixing member (3), a through opening (33) is arranged on the bottom of the A fixing member (3), and the cavity of the A fixing member (3) is connected to the capsule cavity (50) of the vacuum capsule (5) through the through opening (33).

5. The negative pressure structure for exhausting air from a blood collection needle according to claim 4, characterized in that: The B fixing member (4) is in the shape of a straight tube. The bladder outlet (41) is arranged below the B fixing member (4). The diameter of the B fixing member (4) is larger than the outer diameter of the lower end of the A fixing member (3). The lower end of the A fixing member (3) can be placed in the B fixing member (4).

6. The negative pressure structure for exhausting air from a blood collection needle according to claim 1, characterized in that: The inner membrane (32) is made of thick rubber material.

7. The negative pressure structure for exhausting air from a blood collection needle according to claim 1, characterized in that: The outer membrane (42) is made of thin rubber material.

8. The negative pressure structure for exhausting air from a blood collection needle according to claim 1, characterized in that: The volume of the cavity (50) of the vacuum capsule (5) is not less than 0.5 ml.

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