Disposable sensitive blood return vacuum blood taking needle
By improving the design of the blood return cap and the catheter connection method of the sensitive blood return device, the problems of insufficient blood flow and high blood pressure resistance were solved, achieving efficient and safe blood collection operations and reducing the risk of injury to medical staff.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-03
- Publication Date
- 2026-03-24
AI Technical Summary
The design of the blood return cap in existing sensitive blood return devices results in insufficient blood flow, high blood pressure resistance, low blood return sensitivity, and a risk of cuts to medical staff.
It adopts a semi-membrane blood return cap design, with the bottom center of the blood return cap contacting the blood passage groove inside the sensitive blood return device housing. It is connected to the intravenous needle through a catheter and is equipped with a blood collection needle holder to fix the blood collection needle and ensure safe operation.
It increases blood flow rate, reduces blood pressure resistance, shortens blood return reaction time, enhances blood return sensitivity, and prevents medical staff from being scratched.
Smart Images
Figure CN224023567U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a medical device, and in particular to a disposable sensitive vacuum blood collection needle for blood return. Background Technology
[0002] In existing technology, patients need to have their blood drawn for tests in the hospital. To prevent errors, a sensitive blood return device is installed on the intravenous needle. When the intravenous needle is correctly inserted into the blood vessel, the pressure inside the blood vessel is greater than the external pressure, which forces the capsule of the sensitive blood return device to contract upward. At the same time, a small amount of blood will return to the blood vessel. When the intravenous needle is not accurately inserted into the blood vessel, the cap of the sensitive blood return device will not contract upward, and it needs to be reinserted.
[0003] Currently, the blood return caps in commercially available sensitive blood return devices bulge downwards to match the shape of the bottom of the casing, resulting in an excessively narrow infusion tube, insufficient blood flow, and prolonged blood collection time. Additionally, the outer wall of the infusion tube, located in the middle of the bottom of the casing, connects to the inside of the casing, creating significant blood pressure resistance. When the venous needle is correctly inserted into the blood vessel, the pressure within the vessel pushes the air and the blood return cap upwards, causing significant pressure loss. This results in low blood return sensitivity and a long delay. Furthermore, medical staff need to insert the retrieval needle into the blood collection bottle to collect blood; due to the small size of the needle, injuries to medical staff during fast-paced and busy work are still common. Utility Model Content
[0004] In view of this, the technical problem to be solved by this utility model is to provide a disposable sensitive blood return vacuum blood collection needle. Through this technical solution, the blood return cap of the sensitive blood return device is changed to a semi-membrane blood return cap, so that the bottom surface of the middle of the blood return cap is in contact with the groove of the blood passage inside the shell of the sensitive blood return device. This increases the blood collection flow rate, reduces blood pressure resistance, and increases the sensing surface of the blood return cap, thereby shortening the reaction time of blood return and the upward bulging of the blood return cap after the venous needle is correctly inserted into the blood vessel. The sensitive blood return device is connected to the venous needle through a catheter and is equipped with a needle handle to facilitate the safe operation of medical personnel to insert the venous needle into the patient's blood vessel. The blood collection needle is fixed in the blood collection waiting device and is directly connected to the sensitive blood return device. When the blood collection bottle is inserted into the blood collection waiting device, the blood collection needle is also safely inserted into the blood collection bottle.
[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows: A disposable sensitive blood return vacuum blood collection needle includes a vein needle, a needle handle, and a catheter. The needle handle is located on the rear part of the vein needle, and the vein needle is connected to the catheter. It also includes a sensitive blood return device, a blood collection needle, and a blood collection waiting device. The blood collection needle is directly fixed to the output end of the sensitive blood return device. The blood collection waiting device is cup-shaped and is fitted onto the blood collection needle. The rear part of the blood collection needle is fixed to the bottom of the rear end of the blood collection waiting device. The vein needle is connected to the input end of the sensitive blood return device through the catheter.
[0006] As a further technical solution, the sensitive blood return device is composed of a housing, a blood return cap, a blood return cap pressing ring, a blood passage groove, a blood inlet and a blood outlet. The blood inlet and the blood outlet are respectively arranged at both ends of the housing. The front of the housing is open. The blood return cap is fixed at the opening position of the housing through the blood return cap pressing ring. The blood passage groove longitudinally passes through the inner bottom of the housing along the inside of the housing, and both ends of the blood passage groove are respectively communicated with the blood inlet and the blood outlet on the housing. The middle bottom of the blood return cap sunk into the housing presses against the notch of the blood passage groove. The blood collection needle is directly fixed on the blood outlet of the sensitive blood return device, and the venous needle is connected with the blood inlet of the sensitive blood return device through a catheter.
[0007] As a further technical solution, an external thread is arranged on the outside of the blood outlet, and an internal thread is arranged at the rear of the blood collection needle. The blood collection needle is screwed onto the external thread of the blood outlet through the internal thread, so that the blood collection needle is fixed on the blood outlet on the housing.
[0008] As a further technical solution, it further includes a venous needle protective sleeve and a blood collection needle sealing latex cap. The venous needle protective sleeve and the blood collection needle sealing latex cap are respectively sleeved on the corresponding venous needle and blood collection needle.
[0009] As a further technical solution, it further includes a catheter connecting seat. The catheter connecting seat is arranged on the outside of the blood inlet of the sensitive blood return device and the tail of the venous needle. The catheter connecting seat is in a "mountain" shape. The middle of the catheter connecting seat is a blood inlet pipe. A welding fixing ring is sleeved on the outside of the blood inlet pipe. An anti - detachment convex rib is arranged on the outside of the blood inlet pipe. When the blood inlet is connected with the catheter, the inner wall of the catheter is sleeved on the blood inlet pipe and the anti - detachment convex rib of the catheter connecting seat, and the outer wall of the catheter abuts against the inner wall of the welding fixing ring.
[0010] The beneficial effects after adopting the above technical solutions are as follows: For a disposable sensitive blood return vacuum blood collection needle, through this technical solution, the middle bottom surface of the blood return cap respectively contacts the notch of the blood passage groove inside the housing of the sensitive blood return device, which improves the blood collection flow rate, reduces the blood pressure resistance, increases the sensing surface of the blood return cap, thereby shortening the reaction time of blood return in the blood vessel and the upward bulging of the blood return cap after the venous needle is correctly inserted into the blood vessel. The sensitive blood return device is connected with the venous needle through a catheter to facilitate the medical staff to safely operate the venous needle to insert into the patient's blood vessel. And the blood collection needle is fixed in the blood collection waiting device, and the blood collection needle is directly connected with the sensitive blood return device. When the blood collection bottle is inserted into the blood collection waiting device, the blood collection needle is also safely inserted into the blood collection bottle. The venous needle protective cover and the blood collection needle sealing latex cap can protect the venous needle and the blood collection needle from being contaminated, and the blood collection waiting device can prevent the medical staff from being scratched under the rapid and busy work. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 It is a schematic diagram of the overall connection structure of the present utility model.
[0012] Figure 2 This is a schematic diagram of the structure of the sensitive blood return device in this utility model.
[0013] Figure 3 for Figure 2 A side sectional view of the structure.
[0014] Figure 4 for Figure 2 A schematic diagram of the transverse cross-section structure.
[0015] Figure 5 for Figure 1 A schematic diagram of the locally enlarged structure in direction A.
[0016] In the diagram, 1 is the sensitive blood return device, 2 is the catheter, 3 is the intravenous needle, 4 is the blood collection needle, 5 is the blood collection needle holder, 6 is the shell, 7 is the blood return cap, 8 is the blood return cap pressure ring, 9 is the blood passage groove, 10 is the blood inlet, 11 is the bleeding outlet, 12 is the intravenous needle protective sleeve, 13 is the blood collection needle sealing latex cap, 14 is the needle handle, 15 is the inlet tube, 16 is the welding fixing ring, and 17 is the anti-dislodgement protrusion. Detailed Implementation
[0017] The technical solution and specific embodiments of this utility model will be further described below with reference to the accompanying drawings.
[0018] like Figures 1-5 As shown, the disposable sensitive blood return vacuum blood collection needle of this utility model includes a vein needle 3, a needle handle 14, and a conduit 2. The needle handle 14 is located on the rear part of the vein needle 3. The vein needle 3 is connected to the conduit 2. It also includes a sensitive blood return device 1, a blood collection needle 4, and a blood collection waiting device 5. The blood collection needle 4 is directly fixed to the output end of the sensitive blood return device 1. The blood collection waiting device 5 is cup-shaped and is fitted onto the blood collection needle 4. The rear part of the blood collection needle 4 is fixed to the bottom of the rear end of the blood collection waiting device 5. The vein needle 3 is connected to the input end of the sensitive blood return device 1 through the conduit 2.
[0019] As a further embodiment, the sensitive blood return device 1 is composed of a housing 6, a blood return cap 7, a blood return cap pressure ring 8, a blood passage groove 9, a blood inlet 10, and a bleeding outlet 11. The blood inlet 10 and the bleeding outlet 11 are respectively located at both ends of the housing 6. The front of the housing 6 is open. The blood return cap 7 is fixed to the opening of the housing 6 by the blood return cap pressure ring 8. The blood passage groove 9 passes through the bottom of the housing 6 longitudinally. The two ends of the blood passage groove 9 are connected to the blood inlet 10 and the bleeding outlet 11 on the housing 6, respectively. The bottom of the blood return cap 7, which is embedded in the housing 6, presses against the opening of the blood passage groove 9. The blood collection needle 4 is directly fixed to the bleeding outlet 11 of the sensitive blood return device 1. The intravenous needle 3 is connected to the blood inlet 10 of the sensitive blood return device 1 through the conduit 2.
[0020] As a further embodiment, the bleeding port 11 is provided with external threads, and the blood taking needle 4 is provided with internal threads, and the blood taking needle 4 is screwed on the bleeding port 11 through the internal threads, so that the blood taking needle 4 is fixed on the bleeding port 11 of the shell 6.
[0021] As a further embodiment, a venous needle protective sleeve 12 and a blood taking needle closed latex cap 13 are further included, and the venous needle protective sleeve 12 and the blood taking needle closed latex cap 13 are respectively sleeved on the corresponding venous needle 3 and the blood taking needle 4.
[0022] As a further embodiment, a catheter connecting seat is further included, and the catheter connecting seat is arranged outside the blood inlet port 10 of the sensitive blood return device 1, the catheter connecting seat is in the shape of a Chinese character "shan" (mountain), the middle of the catheter connecting seat is a blood inlet tube 15, a welded fixing ring 16 is sleeved outside the blood inlet tube 15, and a anti-falling convex rib 17 is arranged outside the blood inlet tube 15; when the blood inlet port 10 is connected with the catheter 2, the inner wall of the catheter 2 is sleeved on the blood inlet tube 15 and the anti-falling convex rib 17 of the catheter connecting seat, and the outer wall of the catheter 2 is attached to the inner wall of the welded fixing ring 16.
[0023] In the embodiment of the utility model, the venous needle protective sleeve 12 is made of hard plastic, and the blood taking needle closed latex cap 13 is made of elastic soft material, so that the blood taking needle 4 can be directly inserted into the blood taking bottle.
[0024] In the embodiment of the utility model, the blood inlet port 10 of the sensitive blood return device 1 is connected with the catheter 2 through the catheter connecting seat, so that the process of using chemical adhesive to bond the catheter 2 in the prior art is avoided, and the pollution hazard of toxic substances and the chemical residue hazard after using the chemical adhesive are eliminated, and the blood source safety is further protected.
[0025] In the embodiment of the utility model, the tail part of the venous needle 3 is also connected with the catheter 2 through the catheter connecting seat, and the technical solution is the same as the above-mentioned connection, and will not be described in detail here.
[0026] In the working process of the utility model, the venous needle 3 is inserted into the patient's vein, the blood pressure in the human body vessel is greater than the atmospheric pressure outside the blood return cap 7, the blood in the human body vessel flows into the blood channel 9 of the sensitive blood return device 1 through the venous needle 3 and the catheter 2, and the blood return cap 7 is inflated upward under the action of pressure, so that it is proved that the venous needle 3 is correctly inserted into the human body vessel, and the blood taking work can be continued, and the medical staff only needs to insert the blood taking bottle into the blood taking needle holder 5 to complete the blood taking work; when the venous needle 3 is not correctly inserted into the human body vessel, the blood return phenomenon does not occur in the catheter 2, and the blood return cap 7 is not inflated upward, and the operation needs to be re-operated to avoid accidental operation accidents, and the blood taking needle holder 5 can also prevent the medical staff from being scratched in the fast and busy work.
[0027] The above merely describes preferred embodiments of the present application, but is not intended to limit the scope of protection of the present application.
Claims
1. A disposable, sensitive vacuum blood collection needle, comprising a vein needle, a needle handle, and a catheter, wherein the needle handle is disposed on the rear part of the vein needle, and the vein needle is connected to the catheter, characterized in that, It further includes a sensitive blood return device, a blood collection needle, and a blood collection waiting needle device. The blood collection needle is directly fixed to the output end of the sensitive blood return device. The blood collection waiting needle device is cup-shaped and is sleeved on the blood collection needle. The rear part of the blood collection needle is fixed to the bottom of the rear end of the blood collection waiting needle device. The venous needle is connected to the input end of the sensitive blood return device through a catheter.
2. The disposable sensitive blood return vacuum blood collection needle according to claim 1, characterized in that, The sensitive blood return device consists of a housing, a blood return cap, a blood return cap pressing ring, a blood passage groove, a blood inlet, and a blood outlet. The blood inlet and the blood outlet are respectively arranged at both ends of the housing. The front of the housing is in an open shape. The blood return cap is fixed at the opening position of the housing through the blood return cap pressing ring. The blood passage groove longitudinally passes through the inner bottom of the housing along the inside of the housing. Both ends of the blood passage groove are respectively connected to the blood inlet and the blood outlet on the housing. The middle bottom of the blood return cap that sinks into the housing presses against the notch of the blood passage groove. The blood collection needle is directly fixed to the blood outlet of the sensitive blood return device. The venous needle is connected to the blood inlet of the sensitive blood return device through a catheter.
3. The disposable sensitive blood return vacuum blood collection needle according to claim 2, characterized in that, External threads are provided on the outside of the blood outlet. Internal threads are provided on the rear part of the blood collection needle. The blood collection needle is screwed onto the external threads of the blood outlet through the internal threads, so that the blood collection needle is fixed to the blood outlet on the housing.
4. The disposable sensitive blood return vacuum blood collection needle according to claim 1, characterized in that, It further includes a venous needle protective cover and a blood collection needle closed latex cap. The venous needle protective cover and the blood collection needle closed latex cap are respectively sleeved on the corresponding venous needle and blood collection needle.
5. The disposable sensitive blood return vacuum blood collection needle according to claim 2, characterized in that, It further includes a catheter connection seat. The catheter connection seat is arranged on the outside of the blood inlet of the sensitive blood return device. The catheter connection seat is in a "mountain" shape. The middle of the catheter connection seat is a blood inlet pipe. A welding fixing ring is sleeved on the outside of the blood inlet pipe. Anti-detachment convex ribs are arranged on the outside of the blood inlet pipe. When the blood inlet is connected to the catheter, the inner wall of the catheter is sleeved on the blood inlet pipe and the anti-detachment convex ribs of the catheter connection seat, and the outer wall of the catheter abuts against the inner wall of the welding fixing ring.