CN109998567B - Automatic needle head protection-sealing integrated blood and gas collection needle - Google Patents
Automatic needle head protection-sealing integrated blood and gas collection needle Download PDFInfo
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- CN109998567B CN109998567B CN201910418770.0A CN201910418770A CN109998567B CN 109998567 B CN109998567 B CN 109998567B CN 201910418770 A CN201910418770 A CN 201910418770A CN 109998567 B CN109998567 B CN 109998567B
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/15—Devices for taking samples of blood
- A61B5/150007—Details
- A61B5/150015—Source of blood
- A61B5/15003—Source of blood for venous or arterial blood
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/15—Devices for taking samples of blood
- A61B5/150007—Details
- A61B5/150351—Caps, stoppers or lids for sealing or closing a blood collection vessel or container, e.g. a test-tube or syringe barrel
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/15—Devices for taking samples of blood
- A61B5/150007—Details
- A61B5/150374—Details of piercing elements or protective means for preventing accidental injuries by such piercing elements
- A61B5/150534—Design of protective means for piercing elements for preventing accidental needle sticks, e.g. shields, caps, protectors, axially extensible sleeves, pivotable protective sleeves
- A61B5/150633—Protective sleeves which are axially extensible, e.g. sleeves connected to, or integrated in, the piercing or driving device; pivotable protective sleeves
- A61B5/150641—Protective sleeves which are axially extensible, e.g. sleeves connected to, or integrated in, the piercing or driving device; pivotable protective sleeves comprising means to impede repositioning of protection sleeve from covering to uncovering position
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/15—Devices for taking samples of blood
- A61B5/153—Devices specially adapted for taking samples of venous or arterial blood, e.g. with syringes
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Abstract
The invention relates to an automatic needle head protection-sealing integrated blood gas collection needle which is provided with a needle cylinder, a piston, a push-pull rod, a needle head and an outer sleeve; the needle cylinder comprises a needle cylinder seat and a needle cylinder main body; the needle head comprises a needle core and a needle head seat with a limit convex edge on the outer wall; in the unused and assembled state, the distal section of the outer sleeve is positioned outside the needle seat and the needle cylinder seat, the proximal section of the outer sleeve is positioned outside the needle cylinder main body, the distal end of the needle core extends outside the distal opening of the outer sleeve, and the proximal end of the needle cylinder extends outside the proximal opening of the outer sleeve; when pushing force is applied to the outer sleeve, the outer sleeve slides relative to the needle cylinder; a leakage-proof film is arranged at the position, close to the far end, inside the far end section, of the far end section, a barb bead is arranged at one side, close to the near end, of the limiting bead, and a stop block is arranged at the joint part of the far end section and the near end section; the blood gas collection needle is also provided with a membrane switch or a motor switch. The invention can avoid iatrogenic injury to the greatest extent, prevent blood sample from polluting the environment and improve the accuracy of the detection result.
Description
Technical Field
The invention relates to the technical field of medical appliances, in particular to an automatic needle head protection-sealing integrated blood gas collection needle.
Background
Arterial blood gas analysis (Arterial Blood Gas Analysis, ABGA) is performed by measuring the partial pressure of oxygen P (CO) 2 ) And partial pressure of carbon dioxide P (CO) 2 ) The indexes such as pH value, electrolyte and the like are measured, and then the respiratory function of a human body and the acid-base balance condition of blood are correspondingly evaluated, and the indexes can objectively reflect the property and degree of respiratory failure of a patient and have important significance for oxygen therapy, mechanical ventilation parameter adjustment and acid, base and electrolyte unbalance correction in clinic.
After blood gas collection needle blood sampling is used in the prior art, a medical staff usually pulls out the needle head manually first and discards the needle head in a medical waste box, and then a sealing cap is used for sealing a syringe seat. The needle point part of the needle is plugged by the rubber plug, the needle is removed and discarded in the medical waste box, and the operation mode of plugging the syringe seat by the sealing cap is also adopted, but the possibility that air is mixed into a blood gas sample through the needle exists, and the rubber plug is easy to fall off, so that the functions of simulating puncture and sealing are lost.
Patent document CN109106378A, publication date 2019.01.01, discloses an arterial blood hemospast capable of isolating air, the hemospast is provided with a syringe, a connector, a piston push rod, a piston and a needle, the piston is fixed on the front end of the piston push rod, the piston and the piston push rod are arranged in the syringe from the tail end of the syringe, the piston is in sealing fit with the syringe, the connector is fixed on the front end face of the syringe, and the needle is arranged on the connector; the front end of the needle cylinder is internally provided with a baffle plate, the baffle plate is in sealing fit with the needle cylinder, an eccentric hole is formed in the baffle plate, an arc-shaped groove is formed in the peripheral surface of the needle cylinder relative to the baffle plate, a rotary button outwards extends from the peripheral surface of the baffle plate, the rotary button penetrates out of the arc-shaped groove, the inner wall of the needle cylinder is symmetrically provided with a limiting plate, the baffle plate is limited in the front end of the needle cylinder through the limiting plate, and a through hole in the rotary baffle plate is dislocated with a joint hole in the front end of the needle cylinder by rotating the baffle plate. Although the device can rapidly isolate a blood gas sample from air, as the rotary button penetrates out of the arc-shaped groove, the air possibly enters the needle cylinder through the arc-shaped groove crevice to be mixed with blood, the tightness is difficult to ensure, and the requirement on the preparation process is high; the needle is exposed after blood collection, so that the risk of stabbing medical staff exists; the needle is removed after the blood collection, and the blood remaining in the adapter may drip to pollute the environment.
Patent document CN208243562U, bulletin day 2018.12.18, discloses a safety arterial hemostix comprising a needle tube, a piston, a needle head with a needle handle, a needle cap and a needle protection sleeve; the needle cap is clamped at the needle handle and covers the needle head inside the needle handle; the needle protection sleeve comprises a cylindrical sleeve, and a left folding cover and a right folding cover which are arranged on the sleeve; the sleeve is sleeved on the needle handle, and a left slideway and a right slideway are respectively arranged on the corresponding left side wall and the right side wall of the sleeve; the sliding cards at the side walls at the two ends of the left folding cover and the right folding cover are respectively clamped into the sub-slide ways in the left slide way and the right slide way; the sliding card is connected with the left folding cover and the right folding cover through the movable shaft; the top of the left folding cover is provided with a round rubber plug. Although the device has certain effect of preventing blood sampling sample from entering air and avoiding medical personnel from being stabbed, the design of the left folding cover and the right folding cover causes interference to puncture, and the operation of arterial puncture blood sampling needs a certain technical content so as to avoid generating defective samples and preventing complications, so that the design of the interference puncture has defects and the operation is more complex.
Patent document CN201441375U, publication date 2010.04.28, discloses an arterial hemostix, which comprises an outer sleeve, a piston, a core rod and a needle, wherein the piston is arranged at the front part of the core rod, the front end of the outer sleeve is provided with a needle seat with a conical head and threads, a protective cap is arranged outside the needle, a through hole is axially arranged on the piston, a sealing plug which is ventilated and watertight is arranged in the through hole, a sealing cap matched with the needle seat is also arranged in the through hole, a cone head sleeve and a plug matched with a needle seat channel are arranged in the sealing cap, and the cone head sleeve is provided with a hexagonal inner hole. The using process is as follows: pulling the hemostix core rod to a preset scale; arterial puncture is carried out by using a blood taking needle, blood automatically enters the outer sleeve under the pressure of human arteries, air in the outer sleeve is discharged from a sealing plug which is breathable and impermeable in the piston, and after the collected blood reaches a preset scale, the piston is automatically plugged by the blood sample; the blood taking needle head is pulled out from the patient, and the rubber plugging block is immediately inserted; treating the patient puncture site; the blood taking needle head is pulled out from the blood taking device, the sealing cap is covered and sealed rapidly, and then the blood taking needle head is sent to inspection. Although the device can avoid the contact of blood sample and air, the operation of the rubber plugging block for plugging the needle head can still lead to air entering the blood collector tube body, thereby affecting the accuracy of the detection result.
In summary, there is a need for a blood gas collection device that can effectively avoid iatrogenic injury, avoid environmental pollution from blood samples, and rapidly, simply, conveniently, and efficiently achieve isolation of blood gas samples from air.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the blood gas collection device which can effectively avoid iatrogenic injury and environmental pollution of blood samples, and can rapidly, simply, conveniently and effectively realize the isolation of blood gas samples and air.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
an automatic needle head protection-sealing integrated blood gas collection needle is provided with a needle cylinder, a piston, a push-pull rod, a needle head and an outer sleeve; the needle cylinder comprises a needle cylinder seat and a needle cylinder main body; the needle head comprises a needle core and a needle head seat with a limit convex edge on the outer wall; the outer sleeve is sleeved outside the needle seat and the needle cylinder, a distal end face of the outer sleeve is provided with a distal opening, a proximal end face of the outer sleeve is provided with a proximal opening, the outer sleeve comprises a distal section and a proximal section, the distal end of the needle core extends out of the distal opening in an unused and assembled state, the proximal end of the needle cylinder extends out of the proximal opening, the distal section is positioned outside the needle seat and the needle cylinder seat, and the proximal section is positioned outside the needle cylinder main body; the outer sleeve is relatively static with the needle cylinder when no pushing force in the far-end direction is applied to the outer sleeve, and the outer sleeve slides relative to the needle cylinder when pushing force in the far-end direction is applied to the outer sleeve; the inside leak protection membrane that is close to distal end open-ended in distal end district, the inside inner wall that is located spacing bead proximal end one side of distal end district be equipped with a plurality of barb bead, distal end district and proximal end district phase connection's position be equipped with the dog, when pushing the outer tube to distal end direction, spacing bead pass over barb bead one by one and be restricted between the barb bead and the dog of nearest end at last, the pointed end of nook closing member is located the proximal end one side of leak protection membrane and no longer exposes this moment.
As a preferred example of the invention, the automatic needle head protection-sealing integrated blood gas collection needle is provided with an anti-reflux membrane switch, and the membrane switch is positioned in a channel inside the needle cylinder.
More preferably, the membrane switch is positioned at the connection part of the syringe seat and the syringe main body.
As another preferred example of the present invention, the membrane switch is a straight, cross or Y-shaped anti-reflux valve.
As another preferred embodiment of the invention, the distal end of the syringe is assembled with the proximal end of the needle by a connector; the wall of the connector is provided with a through hole, a motor switch is arranged in the through hole, and the top surface of the motor switch is in an inclined plane shape; when the outer sleeve is pushed in the distal direction, the stop block contacts the upper end face of the motor switch, and the motor switch is pressed down into a groove matched with the motor switch in the connector in the sliding process, so that a channel of the connector is closed.
As another preferable example of the invention, the limit rib is a rib which completely surrounds the circumference of the needle seat, and the plane of the limit rib is parallel to the cross section of the needle seat; or the limit ribs are arranged around the needle seat, and the plane formed by the limit ribs is parallel to the cross section of the needle seat.
As another preferred example of the invention, each barb bead is a bead which completely surrounds the inner wall of the distal section in a circle, the plane of each barb bead is parallel to the cross section of the outer sleeve, and the barb beads are sequentially arranged from the distal end to the proximal end; or the plurality of barb ribs may be disposed around the inner wall of the distal section.
As another preferable example of the invention, the stop block is an annular baffle structure or forms an annular baffle structure, the plane of the stop block is parallel to the cross section of the outer sleeve, the center of the stop block is provided with a center hole, and the diameter of the center hole is larger than that of the syringe seat and than that of the needle seat except for the limit convex edge, but smaller than that of the needle seat limit convex edge.
As another preferred embodiment of the present invention, the inner wall of the proximal section is in contact with the outer wall of the syringe body; or a friction guide block is arranged between the inner wall of the proximal section and the outer wall of the syringe main body.
As another preferable example of the invention, the leakage-proof membrane is a straight-shaped, cross-shaped or Y-shaped anti-reflux valve.
The invention has the advantages that:
1. the device is provided with the outer sleeve, the outer sleeve is provided with the leakage-proof film, the barb convex edge and the stop block, and the needle seat is provided with the limit convex edge, so that after blood collection and needle withdrawal, the needle can be quickly pulled out by pushing the outer sleeve towards the needle point direction and is sealed in the outer sleeve, the event that the needle is stabbed by medical staff is difficult to occur, blood can be prevented from dripping from the needle point, and the pollution to the environment is avoided.
2. The shape and the structure of the outer sleeve and the parts thereof enable the operation of removing the needle to be very smooth, and the operation is simple and quick.
3. The membrane switch of the device has the anti-reflux function, so that the blood sample in the syringe main body can be immediately sealed after the blood sampling is finished, the air is prevented from entering to the greatest extent, and the accuracy of the detection result is ensured. And the membrane switch has reasonable shape and position design, and can not influence the smoothness of blood entering the needle cylinder.
4. The motor switch of the device can synchronously block the channel in the joint in the process of removing the needle head, thereby preventing air from entering the blood sample in the needle cylinder and ensuring the accuracy of the detection result. And the motor switch has simple structure, low preparation process difficulty and low cost.
5. The device has the advantages of regular external structure, no interference to arterial puncture blood collection, coherent blood collection process, no separate parts, good integrity and difficult falling and losing.
In general, the device can avoid iatrogenic injury to the greatest extent, prevent the blood sample from polluting the environment, isolate air simply, rapidly and efficiently, and improve the accuracy of the detection result.
Drawings
Fig. 1 is a sectional view of the automatic needle tip protecting-sealing integrated blood gas collection needle of embodiment 1 in an unused and assembled state.
Fig. 2 is a sectional view of the automatic needle tip protecting-sealing integrated blood gas collection needle of example 1 in a disassembled state.
Fig. 3 is a schematic diagram of the membrane switch structure of embodiment 1.
FIG. 4 is a schematic view of the leakage preventing film structure of example 1.
Fig. 5 is a schematic diagram of the automatic needle protection-closure integrated blood gas collection needle of example 1 with the needle removed after blood gas collection is completed.
Fig. 6 is a sectional view of the automatic needle tip protecting-sealing integrated blood gas collection needle of embodiment 2 in an unused and assembled state.
Fig. 7 is a schematic view of the structure of the joint and the motor switch of embodiment 2 in an unblocked state.
Fig. 8 is a schematic view of the structure of the joint and the motor switch of embodiment 2 in a plugged state.
Fig. 9 is a sectional view of the automatic needle tip protecting-sealing integrated blood gas collection needle of embodiment 3 in an unused and assembled state.
Fig. 10 is a schematic diagram of the membrane switch structure of embodiment 4.
Fig. 11 is a schematic view of the structure of the limit rib of embodiment 5.
Fig. 12 is a sectional view of the automatic needle tip protecting-sealing integrated blood gas collection needle of example 6 in an unused and assembled state.
Detailed Description
The following detailed description of the invention provides specific embodiments with reference to the accompanying drawings.
Reference numerals and components referred to in the drawings are as follows:
needle cylinder 1, needle cylinder seat 11, needle cylinder main body 12
Piston 2
Push-pull rod 3
Membrane switch 4
Needle 5, needle core 51, needle seat 52, limit rib 53
Outer sleeve 6, distal opening 61, proximal opening 62, distal section 63, proximal section 64, leakage preventing membrane 65, barbed fins 66, stop 67, central bore 68, friction guide block 69
Connector 7, through hole 71
Motorized switch 8
Herein, the "distal end" refers to the end of the apparatus that is far away from the medical staff in the blood collection process, and correspondingly, the "proximal end" refers to the end of the apparatus that is near to the medical staff in the blood collection process.
Example 1
Referring to fig. 1 and 2, fig. 1 is a sectional view of the automatic needle tip protection-closure integrated blood gas collection needle of embodiment 1 in an unused and assembled state, and fig. 2 is a sectional view of the automatic needle tip protection-closure integrated blood gas collection needle of embodiment 1 in a disassembled state.
The automatic needle head protection-sealing integrated blood gas collection needle is provided with a needle cylinder 1, a piston 2, a push-pull rod 3, a membrane switch 4, a needle head 5 and an outer sleeve 6.
The piston 2 is assembled at the distal end of the push-pull rod 3, the piston 2 is positioned inside the needle cylinder 1, and the push-pull rod 3 can be operated to drive the piston 2 to move in the distal end or the proximal end direction in the needle cylinder 1. The distal end of the barrel 1 is fitted with the proximal end of the needle 5.
The cartridge 1 comprises a distally located cartridge holder 11 and a proximally located cartridge body 12. The membrane switch 4 is positioned at the connecting part of the syringe seat 11 and the syringe main body 12. The membrane switch 4 is a Y-shaped anti-reflux valve (see fig. 3) which lies in a plane parallel to the cross-section of the needle cylinder 1.
The needle 5 comprises a core 51 and a needle holder 52. Needle mount 52 is secured to the outer wall of the proximal end of needle core 51. The distal end of the barrel seat 11 fits within the recess of the needle seat 52. The outer wall of the needle head seat 52 is also provided with a limit rib 53, the limit rib 53 is a rib which completely surrounds the circumference of the needle head seat 52, and the plane of the limit rib 53 is parallel to the cross section of the needle head seat 52.
The outer sleeve 6 is sleeved outside the needle seat 52 and the syringe 1. The distal end face of the outer cannula 6 is provided with a distal opening 61 and the proximal end face is provided with a proximal opening 62, the outer cannula comprising a distal section 63 and a proximal section 64. In the unused and assembled state, the distal end of the needle core 51 protrudes outside the distal opening 61, the proximal end of the needle cylinder 1 protrudes outside the proximal opening 62, the distal section 63 is located outside the needle mount 52 and the needle cylinder mount 11, the proximal section 64 is located outside the needle cylinder body 12, and the inner wall of the proximal section 64 is in contact with the outer wall of the needle cylinder body 12, both having friction forces such that the outer cannula 6 is relatively stationary with respect to the needle cylinder 1, whereas the outer cannula 6 can slide with respect to the needle cylinder 1 when the outer cannula 6 is held and pushed in the distal direction.
The inner part of the distal section 63 near the distal opening 61 is provided with a leakage preventing film 65, the leakage preventing film 65 is a straight anti-reflux valve (see fig. 4), and the plane of the leakage preventing film 65 in the closed state is parallel to the cross section of the outer sleeve 6. The inner wall of the distal section 63 on the proximal side of the spacing rib 53 is further provided with a plurality of barbed ribs 66, each barbed rib 66 being a rib completely encircling the inner wall of the distal section 63, the plane of each barbed rib 66 being parallel to the cross section of the outer sleeve 6. The plurality of barb ribs 66 are arranged in a distal to proximal sequence. The joint between the distal section 63 and the proximal section 64 is provided with a stop 67, the stop 67 is located inside the cavity of the outer sleeve 6 and is a circular baffle structure, the plane of the stop 67 is parallel to the cross section of the outer sleeve 6, the diameter of the central hole 68 in the center of the stop 67 is larger than the diameter of the syringe holder 11 and larger than the diameter of the needle holder 52 except the limit ribs 53, but smaller than the diameter of the limit ribs 53 of the needle holder 52.
The invention relates to a method for using an automatic needle head protection-sealing integrated blood and gas collection needle blood, which comprises the following steps:
(1) Before arterial blood gas collection, the device is taken out from the sterile packaging bag, and the anticoagulant is sucked to lubricate all the lumens and then is pushed away.
(2) During puncturing, the needle is held at the outer part of the proximal section 64 of the outer sleeve 6 and the syringe main body 12 by hand, the push-pull rod 3 is pulled in the proximal direction to a proper position, the membrane switch 4 is opened under the action of negative pressure, and arterial blood enters the syringe main body 12 through the channel of the needle core 51, the channel of the syringe seat 11 and the membrane switch 4.
(3) After the collection is finished, the needle core 51 is withdrawn from the human body, and at this time, the membrane switch 4 is automatically closed because no negative pressure is applied.
(4) Referring next to fig. 5, fig. 5 is a schematic diagram showing the removal of the needle after the end of blood gas collection by the automatic needle protection-closure integrated blood gas collection needle of example 1. The medical staff holds the proximal section 64 by hand, rapidly pushes the outer sleeve 6 in the distal direction, the limit ribs 53 pass over the barb ribs 66 one by one and are finally limited between the nearest barb rib 66 and the stop 67, at this time, the tip of the needle core 51 is positioned at the proximal side of the leak-proof film 65 inside the distal section 63 and is not exposed any more, and the breach of the leak-proof film 65 is also closed automatically; under the further pushing action of the hands of the medical staff, the stop block 67 drives the limit rib 53 to remove the needle 5. After removal, the needle 5 and the outer sleeve 6 are relatively fixed into a whole without falling off due to the cooperation of the limit rib 53, the barb rib 66 and the stop block 67, and the medical waste can be discarded.
(5) Finally, the syringe seat 11 is plugged by using a conventional sealing cap, and the syringe seat is sent to a laboratory.
It should be noted that, the automatic needle protection-sealing integrated blood gas collection needle of this embodiment is provided with the outer sleeve 6, the barb rib 66 and the stop 67 are arranged in the outer sleeve 6, and can be matched with the limit rib 53 on the needle seat 52, the shape and the structural design of each part are reasonable, after the needle 5 is withdrawn from the human body, the needle 5 can be quickly removed in a pushing manner towards the needle tip direction at the first time, and then the needle seat 11 is quickly sealed by using the sealing cap, so that the probability that air enters a blood sample through the needle 5 is reduced, the operation can also well avoid the puncture of medical staff by the needle, the withdrawn needle 5 is locked in the outer sleeve 6, the blood flowing out from the needle tip is reserved in the outer sleeve 6, and the blood can not drop onto objects such as the floor under the sealing effect of the leakage-proof film 65, so that the probability of polluting the environment is reduced. In addition, the automatic needle head protection-closing integrated blood gas collection needle has no negative pressure effect when the push-pull rod 3 is not pulled any more in the use process, the membrane switch 4 is automatically closed, the blood sample in the needle cylinder main body 12 is isolated from the blood sample at the other side of the membrane switch 4, air is prevented from entering the needle cylinder main body 1, and the mixing of the blood gas sample into the air is avoided.
Example 2
Referring to fig. 6, fig. 6 is a sectional view of the automatic needle tip protection-closure integrated blood gas collection needle of embodiment 2 in an unused and assembled state.
The automatic needle head protection-sealing integrated blood gas collection needle is provided with a needle cylinder 1, a piston 2, a push-pull rod 3, a joint 7, a needle head 5 and an outer sleeve 6.
The piston 2 is assembled at the distal end of the push-pull rod 3, the piston 2 is positioned inside the needle cylinder 1, and the push-pull rod 3 can be operated to drive the piston 2 to move in the distal end or the proximal end direction in the needle cylinder 1.
The cartridge 1 comprises a distally located cartridge holder 11 and a proximally located cartridge body 12. The needle 5 comprises a needle core 51 and a needle seat 52, and the needle seat 52 is fixed on the outer wall of the proximal end of the needle core 51. The distal end of the syringe 1 is assembled with the proximal end of the needle 5 through the adapter 7, specifically, the distal end of the adapter 7 is assembled in a groove at the proximal end of the needle holder 52, and the distal end of the syringe holder 11 is assembled in a groove at the proximal end of the adapter 7. The joint 7 is provided with a motor switch 8. The exterior of needle head seat 52 is also provided with a limit rib 53, the limit rib 53 is a rib completely surrounding the circumference of needle head seat 52, and the plane of limit rib 53 is parallel to the cross section of needle head seat 52.
The outer sleeve 6 is sleeved outside the needle seat 52 and the syringe 1. The distal end face of the outer cannula 6 is provided with a distal opening 61 and the proximal end face is provided with a proximal opening 62, the outer cannula comprising a distal section 63 and a proximal section 64. In the unused and assembled state, the distal end of the needle core 51 protrudes outside the distal opening 61, the proximal end of the needle cylinder 1 protrudes outside the proximal opening 62, the distal section 63 is located outside the needle mount 52, the adapter 7 and the needle cylinder mount 11, the proximal section 64 is located outside the needle cylinder body 12, and the inner wall of the proximal section 64 is in contact with the outer wall of the needle cylinder body 12, both having friction forces such that the outer cannula 6 is relatively stationary with respect to the needle cylinder 1, whereas the outer cannula 6 can slide with respect to the needle cylinder 1 when the outer cannula 6 is held and pushed in the distal direction.
The inner part of the distal section 63 near the distal opening 61 is provided with a leakage-proof membrane 65, the leakage-proof membrane 65 is a straight anti-reflux valve, and the plane of the leakage-proof membrane 65 in the closed state is parallel to the cross section of the outer sleeve 6. The inner wall of the distal section 63 on the proximal side of the spacing rib 53 is further provided with a plurality of barbed ribs 66, each barbed rib 66 being a rib completely encircling the inner wall of the distal section 63, the plane of each barbed rib 66 being parallel to the cross section of the outer sleeve 6. The plurality of barb ribs 66 are arranged in a distal to proximal sequence. The joint between the distal section 63 and the proximal section 64 is provided with a stop 67, the stop 67 is located in the cavity of the outer sleeve 6 and is a circular baffle structure, the plane of the stop 67 is parallel to the cross section of the outer sleeve 6, and the diameter of the central hole 68 in the center of the stop 67 is larger than the diameters of the syringe holder 51 and the connector 7, and larger than the diameter of the needle holder 52 except the limit rib 53, but smaller than the diameter of the limit rib 53 of the needle holder 52.
Referring to fig. 7, fig. 7 is a schematic view showing the structure of the joint and the motor switch of embodiment 2 in the non-blocking state. The connector 7 is provided with a through hole 71 on the wall, the through hole 71 is cylindrical, the motor switch 8 is assembled in the through hole 71, the top surface of the motor switch 8 is in an inclined plane shape, the height of one side close to the needle is larger, and the height of one side close to the needle cylinder is smaller.
Referring to fig. 8, fig. 8 is a schematic view showing the structure of the joint and the motor switch in the plugged state of embodiment 2. After the withdrawal of the needle is completed, the medical staff holds the proximal end section 64 by hand, pushes the outer sleeve 6 rapidly in the distal direction, the stopper 67 contacts the upper end surface of the motorized switch 8, and the motorized switch 8 is pushed down into the groove in the connector 7 matching with the motorized switch 8 in the sliding process, thereby closing the passage of the connector 7.
The application method of the automatic needle head protection-sealing integrated blood and gas collection needle blood in the embodiment comprises the following steps:
(1) Before arterial blood gas collection, the device is taken out from the sterile packaging bag, and the anticoagulant is sucked to lubricate all the tube cavities and then is completely pushed away.
(2) During puncturing, the needle is held outside the proximal section 64 of the outer sleeve 6 and the syringe main body 12 by hand, the push-pull rod 3 is pulled in the proximal direction after the needle is inserted into the proper position, and arterial blood enters the syringe main body 12 through the passage of the needle core 51, the passage of the connector 7 and the passage of the syringe seat 11 under the action of negative pressure.
(3) After the collection is completed, the needle core 51 is withdrawn from the human body.
(4) The medical staff holds the proximal section 64 and rapidly pushes the outer sleeve 6 in the distal direction, in the process, the stop 67 contacts the upper end face of the motorized switch 8 to press the motorized switch 8 down to close the passage of the joint 7, the limit ribs 53 pass over the barb ribs 66 one by one, the limit ribs 53 are limited between the nearest barb rib 66 and the stop 67, at the moment, the tip of the needle core 51 is positioned at the proximal side of the leak-proof film 65 inside the distal section 63 and is not exposed any more, and the split of the leak-proof film 65 is also closed automatically; under the further pushing action of the hands of the medical staff, the stop block 67 drives the limit rib 53 to remove the needle 5. After removal, the needle 5 and the outer sleeve 6 are relatively fixed into a whole without falling off due to the cooperation of the limit rib 53, the barb rib 66 and the stop block 67, and the medical waste can be discarded.
(5) Finally, the syringe seat 11 is plugged by using a conventional sealing cap, and the syringe seat is sent to a laboratory.
It should be noted that, the automatic needle protection-sealing integrated blood gas collection needle of this embodiment is provided with the outer sleeve 6, the barb rib 66 and the stop 67 are arranged in the outer sleeve 6, and can be matched with the limit rib 53 on the needle seat 52, the shape and the structural design of each part are reasonable, after the needle 5 is withdrawn from the human body, the needle 5 can be quickly removed in a pushing manner towards the needle tip direction at the first time, and then the needle seat 11 is quickly sealed by using the sealing cap, so that the probability that air enters a blood sample through the needle 5 is reduced, the operation can also well avoid the puncture of medical staff by the needle, the withdrawn needle 5 is locked in the outer sleeve 6, the blood flowing out from the needle tip is reserved in the outer sleeve 6, and the blood can not drop onto objects such as the floor under the sealing effect of the leakage-proof film 65, so that the probability of polluting the environment is reduced. In addition, in the process of removing the needle head 5, the passage inside the connector 7 is closed, blood samples in the syringe main body 12 are isolated, air is prevented from entering the syringe main body 1, and the mixing of blood and gas samples into the air is avoided. The motor switch structure of the connector 7 of the embodiment is very simple, and the difficulty of the preparation process is low.
Example 3
Referring to fig. 9, fig. 9 is a sectional view of the automatic needle tip protection-closure integrated blood gas collection needle of embodiment 3 in an unused and assembled state.
The structure of the automatic needle head protection-closure integrated blood gas collection needle of this embodiment is basically the same as that of the automatic needle head protection-closure integrated blood gas collection needle described in embodiment 1, and the difference is only that: the membrane switch 4 is located in a channel inside the syringe seat 51.
That is, the position of the membrane switch 4 is not limited to the embodiment 1, and can be located at any position inside the syringe 1 in practice, but the best choice is still adopted in the mode described in the embodiment 1, so that the membrane switch 4 can be fully opened in the blood sampling process, and all blood samples of the syringe seat 11 are isolated, thereby improving the accuracy of the detection result.
Example 4
The structure of the automatic needle head protection-closure integrated blood gas collection needle of this embodiment is basically the same as that of the automatic needle head protection-closure integrated blood gas collection needle described in embodiment 1, and the difference is only that: the membrane switch 4 is a cross-shaped anti-reflux valve (see figure 10).
Example 5
The structure of the automatic needle head protection-closure integrated blood gas collection needle of this embodiment is basically the same as that of the automatic needle head protection-closure integrated blood gas collection needle described in embodiment 2, and the difference is only that: the shape and configuration of the stop rib 53, the barb rib 66, and the stopper 67 are different.
Referring to fig. 11, fig. 11 is a schematic view of a limit rib structure in embodiment 5. The number of the limiting ribs 53 is four, each limiting rib 53 is fan-shaped, the four limiting ribs 53 are arranged around the needle seat 52, and the formed plane is parallel to the cross section of the needle seat 52.
The shape of the barb convex edges 66 and the stop blocks 67 is consistent with that of the limit convex edges 53, and the barb convex edges 66 and the stop blocks are fan-shaped and are arranged in a surrounding mode.
Example 6
Referring to fig. 12, fig. 12 is a cross-sectional view of the automatic needle tip protection-closure integrated blood gas collection needle of embodiment 6 in an unused and assembled state. The structure of the automatic needle head protection-closure integrated blood gas collection needle of this embodiment is basically the same as that of the automatic needle head protection-closure integrated blood gas collection needle described in embodiment 1, and the difference is only that: the inner wall of the proximal section 64 of the outer cannula 6 is not in direct contact with the outer wall of the syringe body 12, but a friction guide block 69 is arranged on the inner wall of the proximal section 64, the surface of the friction guide block 69 close to the central axis of the syringe 1 is in contact with the outer wall of the syringe body 12, and the friction guide block 69 and the outer wall have friction force, so that the outer cannula 6 is relatively static with the syringe 1, and the outer cannula 6 can slide relative to the syringe 1 when the outer cannula 6 is held and pushed in the distal direction.
The invention is equally applicable to hypodermic needles, intravenous blood collection needles, and the like.
The foregoing is merely a preferred embodiment of the invention, the particular features, structures, materials or characteristics described may be combined in any suitable manner in one or more examples or illustrations, and it should be further pointed out that modifications and additions may be made to those skilled in the art without departing from the scope of the invention.
Claims (8)
1. An automatic needle head protection-sealing integrated blood gas collection needle is provided with a needle cylinder, a piston, a push-pull rod and a needle head, and is characterized by also being provided with an outer sleeve; the needle cylinder comprises a needle cylinder seat and a needle cylinder main body; the needle head comprises a needle core and a needle head seat with a limit convex edge on the outer wall; the outer sleeve is sleeved outside the needle seat and the needle cylinder, a distal end face of the outer sleeve is provided with a distal opening, a proximal end face of the outer sleeve is provided with a proximal opening, the outer sleeve comprises a distal section and a proximal section, the distal end of the needle core extends out of the distal opening in an unused and assembled state, the proximal end of the needle cylinder extends out of the proximal opening, the distal section is positioned outside the needle seat and the needle cylinder seat, and the proximal section is positioned outside the needle cylinder main body; the outer sleeve is relatively static with the needle cylinder when no pushing force in the far-end direction is applied to the outer sleeve, and the outer sleeve slides relative to the needle cylinder when pushing force in the far-end direction is applied to the outer sleeve; the anti-backflow leakage-proof membrane is arranged at the position, close to the distal opening, inside the distal section, of the distal section, the inner wall, located at one side of the proximal end of the limiting rib, of the limiting rib is provided with a plurality of barb ribs, the joint part of the distal section and the proximal section is provided with a stop block, when the outer sleeve is pushed in the distal direction, the limiting ribs pass over the barb ribs one by one and are limited between the nearest barb rib and the stop block, at the moment, the tip of the needle core is located at one side of the proximal end of the leakage-proof membrane and is not exposed any more, the limiting rib is one rib which completely surrounds one circle of the needle seat, and the plane where the limiting rib is located is parallel to the cross section of the needle seat; or the limit ribs are arranged around the needle seat, the plane formed by the limit ribs is parallel to the cross section of the needle seat, each barb rib is a rib which completely surrounds the inner wall of the far-end section, the plane of each barb rib is parallel to the cross section of the outer sleeve, and the barb ribs are sequentially arranged from the far end to the near end; or the plurality of barb ribs may be disposed around the inner wall of the distal section.
2. The automatic needle protection-closure integrated blood gas collection needle according to claim 1, wherein the automatic needle protection-closure integrated blood gas collection needle is provided with an anti-reflux membrane switch, and the membrane switch is positioned in a channel inside the syringe.
3. The automatic needle head protection-closure integrated blood gas collection needle according to claim 2, wherein the membrane switch is located at a position where the needle cylinder seat is connected with the needle cylinder main body.
4. The automatic needle tip protection-sealing integrated blood gas collection needle of claim 2, wherein the membrane switch is a straight, cross or Y-shaped anti-reflux valve.
5. The automatic needle protection-closure integrated blood gas collection needle according to claim 1, wherein the distal end of the barrel is assembled with the proximal end of the needle by a connector; the wall of the connector is provided with a through hole, a motor switch is arranged in the through hole, and the top surface of the motor switch is in an inclined plane shape; when the outer sleeve is pushed in the distal direction, the stop block contacts the upper end face of the motor switch, and the motor switch is pressed down into a groove matched with the motor switch in the connector in the sliding process, so that a channel of the connector is closed.
6. The automatic needle head protection-closure integrated blood gas collection needle according to claim 1, wherein the stop block is of an annular baffle structure or forms an annular baffle structure, the plane of the stop block is parallel to the cross section of the outer sleeve, the center of the stop block is provided with a center hole, and the diameter of the center hole is larger than the diameter of the needle cylinder seat and larger than the diameter of the needle seat except the limit rib, but smaller than the diameter of the needle seat limit rib.
7. The automatic needle tip shielding-sealing integrated blood gas collection needle of claim 1, wherein an inner wall of said proximal section is in contact with an outer wall of the syringe body; or a friction guide block is arranged between the inner wall of the proximal section and the outer wall of the syringe main body.
8. The automatic needle tip protection-closure integrated blood gas collection needle of claim 1, wherein the leak-proof membrane is a straight, cross or Y-shaped anti-reflux valve.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910418770.0A CN109998567B (en) | 2019-05-20 | 2019-05-20 | Automatic needle head protection-sealing integrated blood and gas collection needle |
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| CN201910418770.0A CN109998567B (en) | 2019-05-20 | 2019-05-20 | Automatic needle head protection-sealing integrated blood and gas collection needle |
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| CN109998567B true CN109998567B (en) | 2024-01-12 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111450355B (en) * | 2020-03-23 | 2022-05-10 | 中国人民解放军海军军医大学 | Needle-prick-proof injector capable of pre-loading medicine |
| CN112890813B (en) * | 2021-02-23 | 2022-12-06 | 河北医科大学第一医院 | arterial blood collection needle |
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| CN109998567A (en) | 2019-07-12 |
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