CN206473380U - Adjustable arteriovenous puncture needle and indwelling sleeve matched with same - Google Patents

Abstract

An adjustable arteriovenous puncture needle and its matching indwelling sleeve and outer protective sleeve, including a needle body, a needle core and a guide wire, the tail end of the needle core is fixed on the needle body, and the upper edge of the needle core The direction of the needle core is provided with at least one track that matches the length of the needle core and limits the radial movement and axial rotation of the guide wire. The guide wire is installed in the track, and the guide wire is made of shape memory alloy. In the initial state, the guide wire does not extend out of the track, and the guide wire is fixed with a handle that facilitates the guide wire to move and extend out of the track. After the guide wire extends out of the track, it presents a natural state. There is an included angle with the extending direction of the tip of the needle core. The angle makes the guide wire parallel to the blood vessel in a natural state after the needle core is inserted into the blood vessel at a fixed angle. The utility model has the advantages of simple structure, convenient operation, wide application range and convenience Reliable, easy to promote, and great practical value.

Description

Adjustable arteriovenous puncture needle and its matching indwelling cannula

technical field

The utility model relates to an adjustable arteriovenous puncture needle and an indwelling sleeve and an outer protective sheath matched with it.

Background technique

In clinical work, arteriovenous puncture and catheterization are often required in order to perform intravenous infusion, arterial invasive blood pressure monitoring and other diagnostic and therapeutic operations on patients. However, for some parts with thicker subcutaneous tissue and deeper blood vessels, traditional puncture needles After the puncture into the blood vessel, it is difficult to adjust the angle to be parallel to the blood vessel, so the blood vessel is often punctured when the indwelling sleeve is pushed, resulting in the failure of the indwelling sleeve, resulting in the need for multiple punctures to complete the indwelling sleeve, which aggravates the pain of the patient .

Utility model content

The utility model provides an adjustable arteriovenous puncture needle with simple structure, convenient operation, wide application range, convenience and reliability, easy popularization and great practical value and its supporting indwelling sleeve for the deficiencies of the prior art and outer case.

The utility model is realized by adopting the following technical solutions: an adjustable arteriovenous puncture needle, including a needle body, a needle core and a guide wire, the tail end of the needle core is fixed on the needle body, and the needle core is The direction is provided with at least one track that matches the length of the needle core and limits the radial movement and axial rotation of the guide wire. The guide wire is installed in the track, and the guide wire is made of shape memory alloy. In the initial state, the guide wire does not extend out of the track, and the guide wire is fixed with a handle that facilitates the guide wire to move and extend out of the track. After the guide wire extends out of the track, it presents a natural state. An included angle is set in the extension direction of the tip end of the core, and the included angle makes the guide wire parallel to the blood vessel in a natural state after the needle core is inserted into the blood vessel at a fixed angle.

The needle body is provided with a chute that limits the axial rotation of the handle and the axial movement distance of the handle, and the handle is installed in the chute.

The track is arranged in the core wall of the core.

The included angle between the guide wire and the extending direction of the needle core is 45° in a natural state.

The needle body is provided with a transparent cavity, the inner cavity of the needle core communicates with the cavity in the needle body, and the joint between the needle core and the needle body is provided with an anticoagulant with anticoagulant effect on the contact surface with blood. layer, so that when the needle core and the needle head are installed, the anticoagulation layer plays the role of isolating and fixing the connection position between the needle core and the needle body, so as to prevent the influence of the material used for the connection between the needle core and the needle body on blood coagulation, and the cavity of the needle body The tail end communicates with the outside world through a tail plug, which is sealed by a liquid-tight gas-permeable membrane.

The breathable membrane is fixed in the tail plug by the tail plug cover.

An indwelling sleeve includes a catheter and a sleeve body, the tail end of the catheter is fixed on the sleeve body by an anticoagulant plug having an anticoagulant effect, and the inner cavity of the catheter communicates with the cavity in the middle of the sleeve body, Here, the anticoagulation plug surrounds the outside of the catheter, and the tail end of the catheter passes through the center of the anticoagulation plug and communicates with the cavity in the middle of the sleeve body. The outer diameter formed by the combination of the guide wire, the inner diameter of the middle cavity of the sleeve body matches the outer diameter of the front end of the needle body, when the sleeve body is installed at the front end of the needle body, the needle core and the guide wire pass through the catheter through, and protrude from the tip of the catheter, which is the tip.

At least one pair of fixing pieces are arranged symmetrically along the axis of the sleeve body on the outer side of the sleeve body.

An outer protective sheath comprises an outer protective sheath body, the inner diameter of the outer protective sheath body matches the outer diameter of a casing, and the outer protective sheath body is provided with a gap matching the size of the fixed piece at the corresponding position of the fixed piece.

Due to the adoption of the above-mentioned structure, this device cleverly utilizes the particularity that the shape of the guide wire made of shape memory alloy can be restored. Next, set the included angle with the extension direction of the needle core, such as: 45°, and then insert the needle core into the blood vessel at a fixed angle, such as inserting the needle core at an angle of 45°, so that when the guide wire breaks away from the shackles of the track After returning to the natural state, the angle between the guide wire and the needle core just compensates for the angle between the needle core and the blood vessel, so that the guide wire remains parallel to the blood vessel in the blood vessel. At this time, the indwelling cannula is limited by the guide wire when it is sent into the blood vessel The function is to send it into the blood vessel along the angle of the guide wire, so as to ensure that the indwelling cannula is just sent into the blood vessel without puncturing the blood vessel, ensuring the success rate of puncture and greatly reducing the pain of the patient.

In summary, the utility model has the advantages of simple structure, convenient operation, wide application range, convenience and reliability, easy popularization and great practical value.

Description of drawings

Fig. 1 is a schematic structural view of the utility model after it is connected with an indwelling sleeve.

Fig. 2 is a structural schematic diagram of the utility model.

Fig. 3 is a schematic diagram of the structure of the guide wire protruding from the needle core of the present invention.

Fig. 4 is a cross-sectional view at Fig. 2A-A.

Fig. 5 is a schematic structural view of the indwelling cannula of the present invention.

Fig. 6 is a structural schematic diagram of the outer protective sheath of the present invention.

detailed description

The utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

As shown in FIGS. 1 , 2 , 3 , and 4 , an adjustable arteriovenous puncture needle includes a needle core 1 , a guide wire 2 , a handle 3 , a needle body 4 and a tail plug 5 . The needle core 1 is made of titanium steel. In this example, the needle core 1 is provided with a track matching the size of the guide wire 2 in the needle core wall. The guide wire 2 is installed in the track and can be moved along the track in the track The guide wire 2 is made of a shape memory alloy, and the guide wire 2 can be divided into a guide wire head end arranged at the head end and a guide wire fixing part at the guide wire tail end. Since the guide wire 2 is made of a shape memory alloy, the During manufacture, the guide wire is at an angle of 45° with the extension direction of the needle core in the natural state, so that when the guide wire protrudes from the end of the puncture needle along the track, the natural state shape can be restored, that is, it forms an angle of 45° with the needle core 1 °, when the guide wire is fully returned to the needle core along the track, it can be in a straight line and hidden in the needle core 1.

The handle 3 is made of medical plastic, and the handle 3 is closely connected with the guide wire fixing part. The needle body 4 is made of medical plastic material and is in the shape of a hollow cylinder. The needle core 1 is supported in the needle body 4 by the needle core support 7. The needle core support 7 provides a fixed position for the needle core, and the needle core passes through the front and back of the needle body. The injection molding material is fixed in the needle body. The connection between the needle core and the needle body is provided with an anticoagulant layer 8 with anticoagulant effect on the contact surface with blood, and the anticoagulant layer 8 can be made of medical polymer materials with anticoagulant effect or can be Made of heparinized material, it is used to isolate the injection molding material that fixes the tail end of the needle core and the cavity of the needle body 4 that communicates with the tail end of the needle core 1 . The range of the chute can limit the handle to slide back and forth within the set space. There is at least one tail plug at the tail end of the needle body 4. The tail plug is made of medical plastic material in the shape of a hollow circular platform with a small head end and a large tail end, which can be disassembled from the needle body 4 tail end. There is at least one air-permeable film in the tail plug 5, which can ensure that the gas can pass through but the liquid cannot pass through. The air-permeable film is fixed in the tail plug by the tail plug cover. The tail plug cover is made of medical plastic material and is in the shape of a hollow circular table with a small head end and a large tail end, which can be disassembled from the tail end of the tail plug.

The indwelling sleeve includes a catheter 14 and a sleeve body 15 . The catheter 14 is made of medical polymer material, has the characteristics of softness, smooth surface, non-toxic and harmless, and is not easy to form thrombus, and is fixed in the sleeve body 15 by plastic injection molding. There is at least one anticoagulant plug with anticoagulant effect at the end of the catheter, where the anticoagulant plug surrounds the outside of the catheter, and the tail end of the catheter passes through the center of the anticoagulant and communicates with the cavity in the middle of the sleeve body for The injection molding material used to fix the catheter is isolated from the cavity in the cannula body to prevent the injection molding material from affecting coagulation. The sleeve body 15 is made of medical plastic and is in the shape of a hollow truncated cone. At least one wing-shaped fixing piece 16 extends from the middle and lower part of the outer side to both sides, which is convenient for holding when puncturing and fixing after indwelling.

The outer protective sheath is made of medical plastic and is used to protect the isolation puncture needle tip. The outer protective sheath has a bullet-like shape, and there is at least one chelate-shaped notch on both sides of the midpoint of its tail end, and the wing-shaped fixing pieces 16 on both sides of the indwelling sleeve body can be snapped into the notch to play a fixing role.

When in use, follow the arteriovenous puncture operation specification, complete the confirmation of the blood vessel position, and after local skin disinfection, remove the outer protective cover of the puncture needle, put the indwelling cannula on the puncture needle, and move the handle to the end of the track to ensure The wire 2 is completely retreated into the needle core 1. The puncture needle is inserted into the skin at an angle of 45°. After the tip of the puncture needle enters the blood vessel, it can be seen that the cavity in the needle body 4 of the puncture needle is slowly filled with blood. At this time, slowly push the handle 3 toward the needle tip of the puncture needle for 5-10mm Finally, the head end of the guide wire 2 can protrude from the head end of the needle core 1, and recover its natural shape, forming an angle of 45° with the needle core (just the same as the trend of the blood vessel), keeping the position of the puncture needle unchanged, and pushing the wing-shaped indwelling cannula. The protrusion 16 slowly sends the indwelling sleeve along the guide wire 2 into the blood vessel. After completion, pull the handle toward the tail end first, retract the guide wire 2 into the needle core, and then withdraw the puncture needle. Finally, connect the tail end of the indwelling sleeve with the infusion line.

The above description is only a description of specific implementation cases of the present utility model, and cannot limit the protection scope of the present utility model. All equivalent changes and modifications made according to the claims of the utility model application and the contents of the description are within the protection scope of the utility model.

Claims (8)

1. a kind of adjustable diacan, it is characterised in that：Including needle body, nook closing member and seal wire, the tail end of the nook closing member It is fixed on needle body, is moved radially and axle along nook closing member direction provided with matching with nook closing member length and limiting seal wire on the nook closing member To at least one track of rotation, the seal wire is arranged in the track, and the seal wire is made for marmem, Seal wire, which does not stretch out, during original state is fixed with the convenient handle for driving seal wire movement to stretch out track on track, the seal wire, described Seal wire, which stretches out, is presented nature after track, the seal wire is provided with an angle with nook closing member head end bearing of trend in its natural state, The angle cause nook closing member with fixed angle insertion blood vessel after, seal wire in its natural state with vessel.

2. adjustable diacan according to claim 1, it is characterised in that：The needle body is provided with restriction hand Handle axial-rotation and the chute for limiting the axial displacement of handle, the handle are arranged in the chute.

3. adjustable diacan according to claim 2, it is characterised in that：The track is arranged on nook closing member In nook closing member wall.

4. adjustable diacan according to claim 3, it is characterised in that：The seal wire is in its natural state Angle with nook closing member bearing of trend is 45 °.

5. the adjustable diacan according to one of Claims 1-4, it is characterised in that：Set in the needle body Have transparent cavity, the nook closing member inner chamber is connected with needle body internal cavity, nook closing member and the needle body junction, with blood contacting surface The anti-freezing layer with blood coagulation resisting function is provided with, the tail end of the needle body cavity is in communication with the outside by detachable tail plug, institute Tail plug is stated to seal by the ventilated membrane of impenetrable liquid.

6. adjustable diacan according to claim 5, it is characterised in that：The ventilated membrane is consolidated by tail gag It is scheduled in tail plug.

7. a kind of indwelling casing tube, supported the use with the adjustable diacan described in one of claim 1 to 6, it is special Levy and be：Including conduit and union body, the tail end of conduit by the anti-freezing plug with blood coagulation resisting function by being fixed on union body On, the conduit cavity is connected with union body central cavity, and the internal diameter of the conduit is outer more than what nook closing member and seal wire were jointly formed Footpath, central cavity internal diameter and the needle body front end external diameter of described sleeve pipe body match, when described sleeve pipe body is arranged on needle body front end, institute State nook closing member and seal wire is passed through out of conduit, and stretch out the head end of the conduit, the head end of the conduit is tip.

8. indwelling casing tube according to claim 7, it is characterised in that：The external side of described sleeve pipe is symmetrical along the axle center of union body Provided with least one pair of stator.