CN107789703A - The indwelling structure and remaining needle of a kind of remaining needle - Google Patents

Abstract

The present invention provides an indwelling structure for an indwelling needle and the indwelling needle, wherein the indwelling structure includes a catheter base, which is provided with an accommodating cavity, and a catheter capable of accommodating a puncture needle is fixed on the cavity wall at one end of the accommodating cavity; The plug is fixedly arranged in the accommodating cavity for insertion or extraction of the puncture needle tube, and divides the accommodating cavity into a first chamber close to the catheter and in communication with the catheter, and a second chamber far away from the catheter; the first chamber To seal the chamber, the side wall is provided with a liquid inlet part that can communicate with the infusion tube, and the side wall of the accommodating chamber is provided with an installation hole; the blocking member is put into the accommodating chamber through the installation hole and connected with the accommodating chamber The wall of the cavity is fixedly connected in the axial direction, preventing the isolation plug from coming out of the accommodating cavity. Since the blocking piece is inserted into the holding chamber from the mounting hole on the side wall of the holding chamber, it is convenient to install during installation, and the blocking piece is less stressed in the holding chamber, so it is not easy to be damaged and prevents the isolation plug from coming out of the catheter. The effect is not easy to fail.

Description

A kind of indwelling structure of indwelling needle and indwelling needle

technical field

The invention relates to the technical field of medical devices, in particular to an indwelling structure of an indwelling needle and the indwelling needle.

Background technique

The venous indwelling needle, also known as the venous trocar, is mainly composed of a soft catheter that can be indwelled in the blood vessel, a stainless steel puncture needle, an infusion joint and a connecting line. One side of the catheter is connected to the infusion joint through the connecting line. The catheter has The needle end for the insertion of the puncture needle and the insertion end pierced into the patient's body, the inner cavity of the catheter is installed with an isolation plug near the needle end, and the puncture steel needle is inserted from the needle end through the isolation plug during puncture. Go deep into the catheter and puncture into the blood vessel together with the catheter. When the catheter has completely entered the blood vessel, the puncture needle is withdrawn, and the isolation plug returns to its original shape under the action of its own elasticity to block the insertion end. In order to prevent the isolation plug from coming out of the catheter, most products use adhesive to fill the gap between the isolation plug and the inner cavity of the catheter to bond the two. Pull out the isolation plug; or sometimes when rescuing patients need pressurized infusion, the pressure in the inner cavity of the catheter increases, and the isolation plug is flushed out of the catheter, causing leakage, blood outflow, air or bacteria into the patient's blood vessels , seriously endangering the life safety of patients.

Chinese patent document CN204219516U discloses a high-pressure indwelling needle. A high-pressure ring is installed between the rubber plug and the needle end in the inner cavity of the catheter to prevent the rubber plug from ejecting from the inner cavity of the catheter from the needle end.

In the above-mentioned prior art, the high-pressure ring needs to have an interference fit with the inner cavity of the catheter, which causes the outer diameter of the high-pressure ring to be larger than the diameter of the inner cavity of the catheter. After being loaded into the catheter lumen, it bears the pressure of the catheter, and long-term use will cause the high-pressure ring to break, resulting in the failure of the blocking rubber plug to escape from the catheter.

Contents of the invention

Therefore, the technical problem to be solved by the present invention is to overcome the inconvenient installation of the isolation plug blocking structure of the indwelling needle in the prior art and the defects that it is easy to break after long-term use, which leads to the failure of the blocking rubber plug to escape from the catheter, thereby providing An indwelling needle structure and an indwelling needle which are convenient to install and prevent rubber plugs from coming out of catheters are not easy to fail.

In order to solve the above technical problems, the present invention provides an indwelling needle structure and an indwelling needle, wherein the indwelling structure of the indwelling needle includes:

Catheter base, which is provided with an accommodating cavity, and a catheter capable of accommodating a puncture needle is fixed on the cavity wall at one end of the accommodating cavity;

The isolation plug is fixedly arranged in the accommodating chamber so that the puncture needle tube can be inserted or pulled out, and divides the accommodating chamber into a first chamber that is close to the catheter and communicates with the catheter, and a chamber away from the catheter. The second chamber of the catheter; the first chamber is a sealed chamber, and the side wall is provided with a liquid inlet part that can communicate with the infusion tube, and the side wall of the accommodating chamber is provided with an installation hole;

The blocking member is fitted into the accommodating cavity through the installation hole and fixedly connected with the cavity wall of the accommodating cavity in the axial direction, so as to prevent the separation plug from coming out of the accommodating cavity.

The blocking member is loaded into the second chamber through the installation hole and fixedly connected with the cavity wall of the second chamber in the axial direction.

The blocking member includes a body and an elastically deformable end disposed on the body, and the blocking member enters the accommodating cavity by pressing the elastically deformable end.

The width of the body in the axial direction matches the width of the installation hole in the axial direction.

The elastic deformation end includes two support arms respectively arranged at two ends of the body, and the two support arms form a U-shaped structure together with the body.

The elastic deformation end is provided with a slot or a bump, and the cavity wall of the second chamber is provided with a slot or a bump on the elastic deformation end to cooperate with and limit the elastic deformation end along the A projection or slot for axial movement of the second chamber.

The side wall of the second chamber is also provided with a limiting hole that cooperates with the elastic deformation end and prevents the blocking member from coming out of the second chamber.

The limiting hole is a through hole opposite to the mounting hole; the end of the elastic deformation end away from the body extends out of the limiting hole, and the outer diameter of the protruding end is larger than the aperture of the limiting hole .

The contact of the elastic deformation end with the hole wall of the limiting hole is provided with a slot or a bump, and the hole wall of the limiting hole is provided with a slot or a bump to cooperate with the contact and limit The elastically deformable end moves along the axial direction of the second chamber with a projection or a slot.

The axial width of the limiting hole matches the axial width of the extending end.

The installation hole extends along the radial direction of the accommodating cavity.

The shape of the outer wall of the portion where the elastically deformable end enters the second chamber matches the shape of the wall at the corresponding position of the second chamber.

An indwelling needle provided by the present invention includes the above indwelling needle indwelling structure.

The technical solution of the present invention has the following advantages:

1. In the indwelling structure of the indwelling needle provided by the present invention, by providing installation holes on the side wall of the accommodating cavity, the blocking member is loaded into the accommodating cavity from the mounting hole during use, and the cavity between the blocking member and the accommodating cavity The wall is fixedly connected in the axial direction, and the blocking member cannot move in the axial direction. The part of the blocking member located in the accommodating cavity can block the isolation plug, preventing the isolation plug from falling out of the catheter and causing danger when the pressure in the catheter lumen is high. It is inserted into the accommodating cavity from the mounting hole on the side wall of the accommodating cavity, which is convenient to install during installation, and the force of the blocking member in the accommodating cavity is small, and it is not easy to be damaged, and the function of preventing the isolation plug from protruding from the catheter is not easy to fail .

2. The indwelling needle indwelling structure provided by the present invention, the blocking member includes a body and an elastically deformable end provided on the body, the blocking member enters the accommodating cavity by squeezing the elastically deformable end, and passes through Squeezing the elastic deformation end can conveniently put the blocking piece into the accommodating cavity. After entering the accommodating cavity, the elastic deformation end loses the extrusion force and returns to its original state. The outer diameter of the blocking piece in the accommodating cavity is larger than the installation hole Aperture of , which prevents movement of the stopper in the radial direction.

3. In the indwelling needle indwelling structure provided by the present invention, the width of the body in the axial direction matches the width of the installation hole in the axial direction, which can prevent the blocking member from shaking in the axial direction in the accommodating cavity.

4. In the indwelling structure of the indwelling needle provided by the present invention, the elastically deformable end is provided with a slot or a protrusion, and the cavity wall of the second chamber is provided with the slot or protrusion on the elastically deformable end. block fit, limit the elastic deformation end along the axial movement of the second chamber projection or groove, through the elastic deformation end on the groove or projection and the groove on the cavity wall of the second chamber Or the cooperation of the protrusion, so that the elastically deformable end is fixed in the second chamber, which can further prevent the blocking member from moving in the axial direction.

5. In the indwelling needle indwelling structure provided by the present invention, the side wall of the second chamber is also provided with a limiting hole that cooperates with the elastic deformation end and prevents the blocking member from coming out of the second chamber, The elastically deformable end of the blocking piece is fitted into the limiting hole, which can further prevent the blocking piece from coming out of the accommodating cavity.

6. In the indwelling structure of the indwelling needle provided by the present invention, the limit hole is a through hole opposite to the installation hole, which can facilitate the installation of the blocking member, and the elastically deformable end extends far from the end of the body. The limiting hole, and the outer diameter of the protruding end is larger than the aperture of the limiting hole, so that the axial and radial movement of the blocking member after installation is limited, and the blocking effect is better.

7. In the indwelling structure of the indwelling needle provided by the present invention, the elastically deformable end is provided with a slot or a bump at the contact point with the hole wall of the limiting hole, and the hole wall of the limiting hole is provided with a The slots or projections at the contact point cooperate with the projections or slots that limit the axial movement of the elastic deformation end along the second chamber, and the slots or projections at the elastic deformation end are in contact with the hole wall of the limiting hole The protrusions or slots on the upper part are used to fix the elastic deformation end in the limit hole, which can limit the movement of the elastic deformation end in the axial and radial directions, thereby restricting the movement of the blocking member in the axial and radial directions, and the blocking effect is better .

8. In the retention structure of the retention needle provided by the present invention, the width of the limiting hole in the axial direction matches the width of the extending end in the axial direction, which can limit the movement of the extending end in the axial direction and thereby limit the blocking member Moving in the axial direction, the blocking effect is better.

9. In the indwelling structure of the indwelling needle provided by the present invention, the installation hole extends along the radial direction of the accommodating cavity, which facilitates the installation of the blocking member, saves materials, and isolates the blocking member that enters the accommodating cavity in the radial direction. The blocking force of the plug is more uniform, and the blocking effect is better.

9. In the indwelling needle indwelling structure provided by the present invention, the shape of the outer wall of the part where the elastic deformation end enters the second chamber matches the shape of the cavity wall at the corresponding position of the second chamber. After the end enters the second chamber, it recovers its elastic force and is in close contact with the wall of the second chamber, which can prevent the blocking member from moving in the radial direction, and has a compact structure.

10. An indwelling needle provided by the present invention includes an indwelling structure of the indwelling needle, the blocking member of the indwelling needle is convenient to install, and the effect of preventing the isolation plug from coming out of the catheter is not easy to fail.

Description of drawings

In order to more clearly illustrate the specific implementation of the present invention or the technical solutions in the prior art, the following will briefly introduce the accompanying drawings that need to be used in the specific implementation or description of the prior art. Obviously, the accompanying drawings in the following description The drawings show some implementations of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any creative work.

FIG. 1 is a cross-sectional view of the indwelling structure of the indwelling needle provided in Embodiment 1 of the present invention;

Fig. 2 is a structural schematic diagram of the indwelling structure of the indwelling needle shown in Fig. 1;

Fig. 3 is a structural schematic diagram of the blocking member shown in Fig. 1;

Fig. 4 is a cross-sectional view of the indwelling needle provided by Embodiment 2 of the present invention.

Explanation of reference signs:

1- catheter; 2- catheter seat; 3- isolation plug;

4-blocking piece; 21-installation hole; 22-limiting hole;

41-body; 42-elastic deformation end.

Detailed ways

The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, or in a specific orientation. construction and operation, therefore, should not be construed as limiting the invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and should not be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as there is no conflict with each other.

Example 1

As shown in FIG. 1 , this embodiment provides an indwelling structure for an indwelling needle, including a catheter 1 , a catheter hub 2 , an isolation plug 3 , and a blocking member 4 .

The catheter base 2 is provided with an accommodating cavity, and the cavity wall at one end of the accommodating cavity is fixed with a catheter 1 capable of accommodating a puncture needle; the isolation plug 3 can be inserted into or pulled out of the puncture needle. Fixedly arranged in the accommodating cavity, the accommodating cavity is divided into a first chamber close to the catheter and in communication with the catheter, and a second chamber away from the catheter; the first chamber The chamber is a sealed chamber, and the side wall is provided with a liquid inlet part that can communicate with the infusion tube. As shown in Figure 2, the side wall of the accommodating chamber is provided with an installation hole 21; the blocking member 4 passes through the The mounting hole 21 is fitted into the accommodating cavity and fixedly connected with the wall of the accommodating cavity in the axial direction, so as to prevent the isolation plug 3 from coming out of the accommodating cavity. By setting the mounting hole 21 on the side wall of the accommodating cavity, the blocking member 4 is inserted into the accommodating cavity from the mounting hole 21 during use, and the blocking member 4 is fixedly connected with the cavity wall of the accommodating cavity in the axial direction, preventing The part 4 cannot move in the axial direction, and the part of the blocking part 4 located in the accommodating cavity can block the isolation plug 3, so as to prevent the isolation plug 3 from falling out of the catheter and cause danger when the pressure in the catheter lumen is high. The installation hole 21 of the side wall of the cavity is inserted into the accommodation cavity, which is convenient for installation during installation, and the force of the blocking member 4 in the accommodation cavity is small, and it is not easy to be damaged, and the effect of blocking the isolating plug 3 from protruding from the catheter is not easy to fail .

The installation hole 21 may be provided on the side wall of the accommodating cavity outside the isolation plug 3 , and the blocking member 4 passes through the isolation plug 3 through the installation hole 21 to block the isolation plug 3 out of the accommodating chamber; or the installation hole 21 is provided on the side wall of the second chamber. In this embodiment, as shown in Figures 1 and 2, the installation hole 21 is provided on the side wall of the second chamber, and the blocking member 4 is inserted into the second chamber through the installation hole 21 chamber and fixedly connected with the wall of the second chamber in the axial direction.

In this embodiment, as shown in FIG. 3 , the blocking member 4 includes a body 41 and an elastically deformable end 42 disposed on the body 41 , and the blocking member 4 enters the elastically deformable end 42 by pressing the elastically deformable end 42 According to the accommodating cavity, the blocking member 4 can be conveniently loaded into the accommodating cavity by squeezing the elastically deformable end 42. The outer diameter of the cavity is larger than the diameter of the installation hole 21, which can prevent the blocking member 4 from moving in the radial direction.

In order to prevent the blocking member 4 from shaking in the axial direction in the accommodating cavity, in this embodiment, the axial width of the body 41 matches the axial width of the installation hole 21 .

As shown in FIG. 4 , the elastically deformable end 42 includes two arms respectively arranged at both ends of the body 41, and the two arms form a U-shaped structure together with the body 41. The support arms can make the blocking member 4 smoothly enter the accommodating cavity, and after the two supporting arms completely enter the accommodating cavity, they lose the extrusion force and return to the original state, which can prevent the blocking member 4 from entering the accommodating cavity Move in radial direction. In an alternative embodiment, the elastically deformable end 42 includes more than two arms arranged on the end of the body 41, by squeezing the arms, the blocking member 4 can smoothly enter the in the housing cavity.

In order to further limit the movement of the stopper 4 in the axial direction, the elastically deformable end 42 is provided with a card groove or a protrusion, and the wall of the second chamber is provided with a card on the elastically deformable end 42 . Groove or projection cooperates, restricts the projection or the groove that described elastic deformation end 42 moves along the axial direction of described second chamber, through the groove or projection on the elastic deformation end 42 and the cavity of the second chamber The elastically deformable end 42 is fixed in the second chamber through the engagement of the groove or the protrusion on the wall.

As shown in FIG. 2 , the side wall of the second chamber is also provided with a limiting hole 22 that cooperates with the elastic deformation end 42 and prevents the blocking member 4 from coming out of the second chamber. The blocking member 4 The elastically deformable end 42 is fitted into the limiting hole 22, which can further prevent the blocking member 4 from coming out of the accommodating cavity. In this embodiment, the limit hole 22 is a through hole opposite to the installation hole 21, which can facilitate the installation of the blocking member 4, and the end of the elastic deformation end 42 away from the body 41 protrudes from the Limiting hole 22, and the outer diameter of the protruding end is larger than the aperture of the limiting hole 22, so that the movement of the blocking member 4 in the axial and radial directions can be restricted after installation, and the blocking effect is better.

In this embodiment, the elastically deformable end 42 is provided with a slot or a bump at the contact point with the hole wall of the limiting hole 22, and the hole wall of the limiting hole 22 is provided with a contact with the hole wall. The slot or projection at the position is matched with the projection or slot that restricts the axial movement of the elastic deformation end 42 along the second chamber. The projections or slots on the hole wall cooperate to fix the elastic deformation end 42 in the limit hole 22, which can further limit the movement of the elastic deformation end 42 in the axial and radial directions, thereby limiting the axial and radial movement of the blocking member 4. movement, the blocking effect is better.

In order to further limit the position of the elastic deformation end 42 in the axial direction, in this embodiment, the width of the limiting hole 22 in the axial direction matches the width of the extending end in the axial direction, so that the extending end can The position in the axial direction cannot be moved, so that the elastic deformation end 42 cannot move in the axial position, which ensures the blocking effect.

In this embodiment, as shown in FIG. 1, the installation hole 21 extends radially along the accommodating cavity, which facilitates the installation of the blocking member 4, saves material, and enters into the accommodating cavity radially. The blocking force of the blocking member 4 on the isolation plug 3 is more uniform, and the blocking effect is better.

In this embodiment, the shape of the outer wall of the portion where the elastic deformation end 42 enters the second chamber matches the shape of the cavity wall at the corresponding position of the second chamber, and the elastic deformation end 42 enters the second chamber. The elastic force recovered after the chamber is in close contact with the wall of the second chamber, which can prevent the movement of the blocking member 4 in the radial direction, and has a compact structure. In an alternative embodiment, the shape of the elastically deformable end 42 entering the second chamber does not match the shape of the cavity wall at the corresponding position, as long as the outer diameter of the elastically deformable end 42 in a free state is larger than that of the installed The diameter of the hole 21 can prevent the movement of the blocking member 4 in the radial direction.

When installing, align the elastically deformable end 42 with the installation hole 21, squeeze the elastically deformable end 42 so that the elastically deformable end 42 smoothly passes through the installation hole 21 and enters the accommodating cavity, the installation is convenient, and the elastically deformable end 42 completely enters the accommodating cavity After losing the extrusion force and returning to the free state, the protruding end of the elastic deformation end 42 snaps into the limit hole 22, and the axial and radial movement of the blocking member 4 in the accommodating cavity is restricted, and it is not easy to move from the accommodating cavity. The protruding from the cavity can prevent the rubber plug from protruding from the accommodating cavity when the pressure in the catheter lumen is high, and the danger can be avoided.

Example 2

As shown in Figure 4, it is a specific embodiment of the indwelling needle, including the indwelling structure of the indwelling needle provided in Example 1. After the needle tube is pulled out from the catheter 1, the isolation plug 3 restores its elasticity to seal the first chamber. When the inner cavity pressure is high, the stopper 4 can prevent the separation plug 3 from coming out of the catheter adapter 2, the stopper 4 of the indwelling needle is convenient to install and the effect of preventing the separation plug 3 from coming out of the catheter is not easy to fail.

Apparently, the above-mentioned embodiments are only examples for clear description, rather than limiting the implementation. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. It is not necessary and impossible to exhaustively list all the implementation manners here. And the obvious changes or changes derived therefrom are still within the scope of protection of the present invention.

Claims (13)

1. A kind of 1. indwelling structure of remaining needle, it is characterised in that including：

   Catheter block (2), accommodating cavity is provided with it, the conduit for puncturing needle tubing can be housed by being installed with the cavity wall of described accommodating cavity one end (1)；

   Batching pig (3), it is available for the puncture needle tubing to be fixedly installed on inserting or pull out in the accommodating cavity, by the accommodating cavity It is separated into the close conduit (1) and the first chamber connected with the conduit (1), and the second chamber away from the conduit (1) Room；The first chamber is sealed chamber, and side wall is provided with the feed liquor portion that can be connected with woven hose, the side wall of the accommodating cavity It is provided with mounting hole (21)；

   Block piece (4), it is fitted into by the mounting hole (21) in the accommodating cavity and solid in axial direction with the cavity wall of the accommodating cavity Fixed connection, stops that the batching pig (3) is deviate from from the accommodating cavity.
2. 2. the indwelling structure of remaining needle according to claim 1, it is characterised in that the block piece (4) passes through the peace Dress hole (21) is fitted into the second chamber and is connected with the cavity wall of the second chamber in axial restraint.
3. 3. the indwelling structure of remaining needle according to claim 2, it is characterised in that the block piece (4) includes body (41) and elastic deformation end (42) on the body is set, the block piece (4) is by extruding the elastic deformation end (42) accommodating cavity is entered.
4. 4. the indwelling structure of remaining needle according to claim 3, it is characterised in that width of the body (41) in axial direction Match with width of the mounting hole (21) in axial direction.
5. 5. the indwelling structure of remaining needle according to claim 3, it is characterised in that the elastic deformation end (42) includes dividing Not She Yu body (41) both ends two support arms, two support arms form U-shape structure together with the body (41).
6. 6. the indwelling structure of the remaining needle according to claim 3-5, it is characterised in that set on the elastic deformation end (42) Have neck or a projection, the cavity wall of the second chamber be provided with coordinate with the neck on the elastic deformation end (42) or projection, Limit the projection or neck of axial movement of the elastic deformation end (42) along the second chamber.
7. 7. the indwelling structure of the remaining needle according to any one of claim 1-6, it is characterised in that the second chamber It is additionally provided with side wall and coordinates with the elastic deformation end (42), prevents what the block piece (4) from deviating from from the second chamber Spacing hole (22).
8. 8. the indwelling structure of remaining needle according to claim 7, it is characterised in that

   The spacing hole (22) is the through hole being oppositely arranged with the mounting hole (21)；

   The spacing hole (22), and the external diameter of external part are stretched out in the one end of the elastic deformation end (42) away from the body (41) More than the aperture of the spacing hole (22).
9. 9. the indwelling structure of the remaining needle according to claim 7 or 8, it is characterised in that

   The elastic deformation end (42) is provided with neck or projection with the contact position of the hole wall of the spacing hole (22), described spacing The hole wall in hole (22), which is provided with, to be coordinated with the neck or projection of the contact position, limits the elastic deformation end (42) along described the The projection or neck of the axial movement of two chambers.
10. 10. the indwelling structure of the remaining needle according to claim 7 or 8, it is characterised in that the spacing hole (22) is in axial direction Width in axial direction of width and the external part match.
11. 11. the indwelling structure of remaining needle according to claim 1, it is characterised in that the mounting hole (21) is along the appearance Put radially extending for chamber.
12. 12. the indwelling structure of the remaining needle according to any one of claim 3-11, it is characterised in that the elastic deformation (42) are held into the outer wall shape and the cavity wall shape phase of the second chamber corresponding position of the part in the second chamber Matching.
13. A kind of 13. remaining needle, it is characterised in that the indwelling structure including the remaining needle any one of claim 1-12.