CN204815143U - Rataining needle - Google Patents

Abstract

An indwelling needle, comprising: a catheter bushing, one end of which is provided with a catheter for indwelling in a blood vessel; a needle bushing, located at the other end of the catheter bushing, is provided with a needle core for being inserted into the catheter, and the outer part of the needle bushing is There are wings for hand-holding; a protector for the needle core to pass through, one end is passed through the needle bushing, and the other end is provided with a connecting part connected with the catheter bushing, when the needle core is pulled out from the catheter, the needle tip can Back into the protector; the connecting part rotates synchronously with the catheter bushing, and a stop block is provided outside the connecting part, which is located on the circumferential side of the wing, and is used to abut against the wing to prevent the catheter bushing from being Rotation due to gravity. The indwelling needle solves the problem of easy deflection between the needle core and the catheter.

Description

Catheter

technical field

The utility model relates to a medical device, in particular to an indwelling needle.

Background technique

Existing indwelling needles generally include a needle hub, a soft catheter and a needle core (such as a steel needle), and one end of the needle core is fixedly mounted on the needle hub and inserted into the catheter. When in use, the needle core can puncture human blood vessels, and at the same time introduce the catheter into the blood vessel. After the puncture is completed, the needle core is pulled out and discarded, while the catheter is suspended in the blood vessel, and infusion therapy is performed through the catheter.

When the needle core is discarded, the needle point is exposed, and in the process of handling the exposed needle core, medical staff are easily stabbed by the exposed needle point, and, because some blood stains or germs of patients also exist on the exposed needle point, it is easy to Pollution of the environment poses a threat to the health of other patients and medical staff.

Referring to Fig. 1, the Chinese utility model patent with the notification number CN202777289U discloses an indwelling needle. For the convenience of description, Fig. 1 fine-tunes the label of the original drawing of the patent. As shown in Figure 1, the indwelling needle includes a catheter hub 22 with a catheter 21 fixed therein, a needle hub 32 with a needle body (i.e. a needle core, not shown in the figure) inside, and a protective device connected to the needle hub 32. Protector 4, protector 4 is connected with conduit bushing 22. The needle body passes through the protector 4 and is inserted into the catheter 21 . Wherein, the conduit bushing 22 is further provided with a diverging port (or called a diverging interface) 222 for connecting the extension pipe 5 . When the needle body withdraws from the catheter 21, it retreats into the protector 4, and the protector 4 is used to cover the needle tip of the needle body to prevent it from being exposed.

As shown in Figure 1, the protector 4 includes an inner cylinder 41 for matching with the conduit bushing 22 and an outer cylinder 42 sleeved outside the inner cylinder 41, the inner cylinder 41 is provided with an arm 411, and the conduit bushing 22 The base end is provided with an annular flange 221 on the outer peripheral surface. The outer cylinder 42 is sheathed outside the inner cylinder 41 and presses the arm portion 411 on the outer peripheral surface of the conduit bushing 22 , so that the flange 221 and the arm portion 411 engage with each other to connect the conduit bushing 22 and the protector 4 . Wherein, there is a gap on the peripheral surface of the outer cylinder 42 to expose part of the inner cylinder 41 , that is to say, the inner cylinder 41 is half surrounded by the outer cylinder 42 .

The above-mentioned indwelling needle has the following defects:

First, when the medical personnel hold the needle hub in a horizontal direction, the weight of the catheter hub on the branch port side is relatively large, so that the catheter hub will rotate relative to the needle hub, resulting in deflection between the catheter and the needle core. affect the piercing operation.

Second, there is a gap in the circumferential direction of the outer cylinder, and there is a shaking gap between the inner cylinder and the outer cylinder, and shaking between the catheter bushing and the needle bushing is likely to occur during puncturing, thereby affecting the accuracy of puncturing.

Third, when in use, after the puncture is completed, the medical staff will use a transparent applicator to fix the catheter bushing on the patient's skin surface. cause pain to the patient.

Utility model content

The first problem solved by the utility model is that when the existing indwelling needle is held by the needle bush in the horizontal direction, the deflection between the catheter and the needle core is easy to occur; the second problem is that the catheter bush of the existing indwelling needle and the Shaking will occur between the protectors; the third problem is that the existing indwelling needle will compress the local skin of the indwelling site after indwelling.

In order to solve the above problems, the utility model provides an indwelling needle, comprising: a catheter bushing, one end of which is provided with a catheter for indwelling in a blood vessel; a needle bushing, located at the other end of the catheter bushing, is provided with a The needle core in the catheter is provided with wings for holding on the outside of the needle hub; and a protector for the needle core to pass through, one end is passed through the needle hub, and the other end is provided There is a connecting part connected with the catheter bushing, when the needle core is withdrawn from the catheter, the needle tip can retreat into the protector; the connecting part rotates synchronously with the catheter bushing, A stop block is provided outside the connecting part, and the stop block is located on one side of the wing in the circumferential direction, and is used to abut against the wing to prevent the catheter bush from being damaged due to gravity when it is punctured. rotate.

Optionally, the connecting part includes an inner cylinder and an outer cylinder sheathed outside the inner cylinder, the outer cylinder completely wraps around the inner cylinder in the circumferential direction and cannot be rotated relative to the inner cylinder way to cooperate.

Optionally, the stop block is arranged outside the outer cylinder.

Optionally, a first engaging portion protrudes from the outer peripheral surface of the conduit bushing, and a second engaging portion is provided on the connecting portion for engaging with the first engaging portion; The first engaging portion is arranged at a position where the catheter bushing does not contact the patient's skin when indwelling.

Optionally, the corners of the first engaging portion facing the side of the patient's skin are rounded.

Optionally, the conduit bushing is also provided with a diverging interface for connecting the extension pipe; the first engaging part includes two flanges arranged symmetrically along the radial direction, one of which is along with the diverging interface. Axes are on the same straight line.

Optionally, the first engaging part further includes a slot provided on the side of each flange facing the conduit; the second engaging part has a free end for being engaged in the corresponding slot. block.

Optionally, the second engaging part is arranged outside the inner cylinder and is in the shape of an elastic arm, and the outer cylinder can move axially with the needle hub relative to the inner cylinder; axial movement, the outer cylinder can press the second engaging part outside the catheter bushing so that the second engaging part and the first engaging part engage with each other, or release the pairing The pressing of the second engaging portion causes the second engaging portion to disengage from the first engaging portion.

Compared with the prior art, the technical solution of the utility model has the following advantages:

The outside of the connection part abuts against each other through the stop block and the wings, so as to prevent the catheter bush from rotating due to gravity during puncturing, thereby solving the problem of easy deflection between the needle core and the catheter.

Further, the outer cylinder completely wraps the inner cylinder in the circumferential direction and cooperates anti-rotationally, eliminating the shaking gap between the inner cylinder and the outer cylinder, and solving the problem of easy shaking between the catheter bushing and the needle bushing during puncture.

Furthermore, the first engaging portion on the catheter bushing is set at a position where it does not contact the patient's skin during indwelling, so as to avoid pressure on the skin during indwelling.

Description of drawings

Fig. 1 is a three-dimensional exploded view of an existing indwelling needle.

Fig. 2 is an assembly drawing of the indwelling needle of the present invention.

Fig. 3 is a three-dimensional exploded view showing the indwelling needle of the embodiment of the utility model from a perspective.

Fig. 4 is a three-dimensional exploded view showing the indwelling needle of the embodiment of the present utility model from another perspective.

Fig. 5 shows a three-dimensional exploded view of the inner cylinder and the outer cylinder of the protector for the indwelling needle according to the embodiment of the present invention.

Fig. 6 is a bottom view of the indwelling needle according to the embodiment of the present invention, in which the structures of the wings and the stopper are shown.

Fig. 7 is a left view of the indwelling needle of the embodiment of the present utility model.

Fig. 8 shows the state when the wing turns to an angle from the left view direction.

Fig. 9 shows the state when the wing turns to another angle from the left view direction.

Fig. 10 is a perspective view of the catheter bushing in the indwelling needle according to the embodiment of the present invention.

Fig. 11 is a front view of the catheter bushing in the indwelling needle according to the embodiment of the present invention.

Fig. 12 is a right view of the catheter bushing in the indwelling needle according to the embodiment of the present invention.

Detailed ways

In order to make the above purpose, features and advantages of the utility model more obvious and easy to understand, specific embodiments of the utility model will be described in detail below in conjunction with the accompanying drawings.

The embodiment of the present invention provides an indwelling needle, as shown in FIG. 2 , which includes a catheter bushing 10 and a needle bushing 20 arranged coaxially. One end of the catheter bushing 10 is provided with a soft catheter 11 for indwelling in the blood vessel, and the catheter bushing 10 is also provided with a branch interface 12 for connecting an extension tube 30 for infusion. The needle hub 20 is located at the other end of the catheter hub 10, and is provided with a needle core (such as a steel needle, not shown in the figure) for inserting into the catheter 11. The needle hub 20 is provided with a wing 21 for holding. Wherein, the needle hub 20 is provided with a filter cap 22 at an end away from the catheter hub 10 , and the needle core is fixed on the filter cap 22 and inserted into the needle hub 20 . Generally, one of the wing portion 21 and the bifurcating interface 12 is located on one side of the radial direction, and the other is located on the other side of the radial direction, and the angle between the two along the radial direction is approximately 180 degrees.

Wherein, the needle core and the needle bushing 20 move synchronously; the catheter bushing 10 is provided with sealing rubber (not shown in the figure) to prevent air from entering the catheter 11 . The sealing rubber is provided with a slit axially penetrating for the needle core to pass through. The sealing rubber of the indwelling needle will hold the needle core tightly. When the medical staff uses the indwelling needle, in order to ensure the smoothness of needle extraction, the needle bushing 20 is rotated to drive the needle core to rotate relative to the sealing rubber, so as to loosen the needle core and prevent It is difficult to pull out due to the tight contact between the sealing rubber and the needle core. When puncturing, the user holds the wing part 21, inserts the needle core into the blood vessel, and at the same time introduces the catheter 11 into the blood vessel. After puncturing, the user moves the needle hub 20 in a direction away from the catheter hub 10 to withdraw the needle core from the catheter 11 , finally, the catheter 11 is suspended in the blood vessel, and the extension tube 30 is used as an infusion tube for infusion.

Referring to Fig. 2 and in combination with Fig. 3 and Fig. 4, the indwelling needle also includes a protector 40, the two ends of which are respectively connected to the catheter bushing 10 and the needle bushing 20, and the protector 40 is provided with a needle passage for the needle core to pass through. Specifically, the protector 40 is arranged coaxially with the catheter hub 10 and the needle hub 20 , one end of which is passed through the needle hub 20 , and the other end is provided with a connecting portion 41 detachably connected with the catheter hub 10 . In the assembled state, the needle core is passed through the needle passage of the protector 40 and inserted into the catheter 11 through the needle passage. When the needle core is withdrawn from the catheter 11, the needle tip can retreat into the needle passage of the protector 40, and the protector can cover the needle tip to avoid personal injury or environmental pollution caused by the exposed needle tip.

In this embodiment, as shown in FIG. 4 in combination with FIG. 5 and FIG. 6 , the connecting portion 41 and the conduit bushing 10 are connected in a manner that cannot rotate relative to each other, and both rotate synchronously. The connecting part 41 is provided with a stop block 41a. In the assembled state, the stop block 41a is located on the circumferential side of the wing part 21, and is used to abut against the wing part 21 to prevent the catheter bush from being punctured by gravity. And the rotation occurs. When puncturing, the user holds the wing 21 to puncture. If the side of the indwelling needle facing the patient's skin is defined as the lower side and the other side is upper, the stopper 41a is located below the wing 21 .

As shown in Figure 7, for the catheter hub 10, since the extension tube 30 is connected to one side of the diverging interface 12, the weight on this side is relatively large. direction rotation (R direction in the figure), so that the stop block 41a and the wing 21 abut against each other, and the wing 21 will prevent the catheter bushing 10 from continuing to rotate, thereby avoiding deflection between the catheter 11 and the needle core.

Further, the connection part 41 includes an inner cylinder 411 and an outer cylinder 412 sleeved outside the inner cylinder 411, the connection part 41 contacts and cooperates with the catheter hub 10 through the inner cylinder 411, and the outer cylinder 412 can move with the needle hub 20 relative to The inner cylinder 411 moves in the axial direction.

At this time, the stop block 41 a is disposed outside the outer cylinder 412 .

The inner cylinder 411 cooperates with the catheter bushing 10 in a non-rotatable manner and rotates synchronously, and the outer cylinder 412 completely wraps the inner cylinder 411 along the circumferential direction, so that the relative rotation between the catheter bushing 10 and the outer cylinder 412 is impossible. When loosening the needle core, as shown in Fig. 1 and in conjunction with Fig. 8 and Fig. 9, the wings 21 are rotated so that the needle hub 20 drives the needle core to rotate relative to the catheter 11. At this time, the protector 40 and the catheter hub 10 are not separated. turn.

In this embodiment, referring to FIG. 3 and FIG. 4 in conjunction with FIG. 10 to FIG. 12 , the connecting portion 41 is connected to the catheter bushing 10 through a snap fit. Specifically, a first engaging portion 13 for snap-fitting with the connecting portion 41 is protruded on the outer peripheral surface of the conduit bushing 10 . Correspondingly, the connecting portion 41 is provided with a second engaging portion 411 a for engaging with the first engaging portion 13 . In this embodiment, the second engaging portion 411a is arranged outside the inner cylinder 411 and is in the shape of an arm with elasticity. The engaging portion 411a and the first engaging portion 13 are engaged with each other. Wherein, the outer cylinder 412 is provided with a slide groove 412a for sliding the second engaging portion 411a.

Wherein, the first engaging portion 13 is arranged at a position where the catheter hub 10 does not contact the patient's skin during indwelling, so as to avoid pressure on the skin of the indwelling site. Moreover, there is a smooth transition between the surface of the first engaging portion 13 facing the patient's skin in the circumferential direction and the peripheral surface of the first engaging portion 13 . In other words, the edge of the first engaging part 13 facing the patient's skin is rounded to ensure good fit with the skin when it contacts the skin in the indwelling state, and to prevent skin damage caused by too sharp edges.

Further, the first engaging portion 13 includes two radially symmetrical flanges, one of which is located on the same straight line as the branch port 12 in the axial direction. In this way, when puncturing, the two flanges are basically located on both sides of the indwelling needle to avoid contact with the skin.

The first engaging portion 13 also includes an engaging slot 14 on the side of each flange facing the conduit 11, and the second engaging portion 411a has an engaging block 411b at the free end for engaging in the corresponding engaging slot 14 (Fig. 5).

In the assembled state, the outer cylinder 412 is completely sleeved outside the inner cylinder 411, and the second engaging part 411a is pressed against the outer peripheral surface of the catheter bushing 10, and the locking block 411b of the second engaging part 411a is locked into the corresponding locking The groove 14 abuts against the corresponding flange 13, and the flange 13 provides an axial limit for the second engaging portion 411a. When the puncture is completed and the user pulls the needle hub 20 to move away from the catheter hub 10, the outer cylinder 412 moves along the inner cylinder 411 away from the catheter hub 10 along with the movement of the needle hub 20, and gradually releases the second locking part. 411a, the second engaging part 411a gradually opens and breaks away from the engaging groove under the action of elasticity, and finally disengages from the first engaging part 13, so that the protector 40 is separated from the catheter bushing 10, and the needle core is completely retracted at this time. to the protector 40.

In other embodiments, the connecting portion 41 may also adopt other forms, as long as it can realize detachable connection with the catheter bushing 10 .

Although the utility model is disclosed as above, the utility model is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present utility model, so the protection scope of the present utility model should be based on the scope defined in the claims.

Claims (8)

1. An indwelling needle, comprising: Catheter bushing with a catheter at one end for indwelling in a blood vessel; a needle hub, located at the other end of the catheter hub, with a needle core for inserting into the catheter inside, and a wing for holding on the outside of the needle hub; and The protector through which the needle core can pass has one end pierced in the needle bushing, and the other end is provided with a connection part connected with the catheter bushing, when the needle core is pulled out from the catheter , the needle tip can retreat into the protector; It is characterized in that, The connecting portion rotates synchronously with the conduit bushing, and a stop block is provided outside the connecting portion, and the stop block is located on one side of the wing portion in the circumferential direction, and is used to abut against the wing portion , to prevent the catheter hub from rotating due to gravity during puncturing. 2. The indwelling needle according to claim 1, wherein the connecting part comprises an inner cylinder and an outer cylinder sleeved outside the inner cylinder, and the outer cylinder completely wraps the inner cylinder in the circumferential direction, And it cooperates with the inner cylinder in a non-rotatable manner. 3. The indwelling needle according to claim 2, characterized in that, the stop block is arranged outside the outer cylinder. 4. The indwelling needle according to claim 2, wherein a first engaging portion is protruded on the outer peripheral surface of the catheter bushing, and a second engaging portion is provided on the connecting portion for connecting with The first engaging parts are engaged with each other; The first engaging portion is disposed at a position where the catheter bushing does not contact the patient's skin during indwelling. 5. The indwelling needle according to claim 4, characterized in that, the corner of the side facing the patient's skin of the first engaging portion is rounded. 6. The indwelling needle according to claim 4 or 5, characterized in that, the catheter bushing is also provided with a diverging interface for connecting an extension tube; The first engaging portion includes two radially symmetrical flanges, one of which is located on the same straight line as the bifurcating interface in the axial direction. 7. The indwelling needle according to claim 6, wherein the first engaging portion further comprises an engaging groove provided on a side of each flange facing the catheter; The free end of the second locking part has a locking block for locking in a corresponding locking slot. 8. The indwelling needle according to claim 4, wherein the second engaging part is arranged outside the inner cylinder and is in the shape of an elastic arm, and the outer cylinder can be opposed to the needle hub move axially in the inner cylinder; By moving in the axial direction, the outer cylinder can press the second engaging portion outside the catheter bushing so that the second engaging portion and the first engaging portion engage with each other, or The pressing on the second engaging portion is released so that the second engaging portion is separated from the first engaging portion.