JP4890952B2 - Indwelling needle - Google Patents

Description

  The present invention relates to an indwelling needle used for, for example, infusion.

  When a medical needle is handled, the needle tip of the injection needle is protected by some means so that no puncture occurs after use. For example, a medical needle disclosed in Patent Document 1 below is a needle used for blood collection or the like, and includes an injection needle, a needle base that holds a rear portion of the injection needle, and an injection needle and a needle base inside after use. And a case that can be stored. The medical needle has a groove for inclining the needle base in the case, the needle base has a protrusion guided by the groove, and the protrusion is inserted into the groove when the needle base is stored. I am guiding you. With this configuration, the needle base and the injection needle once accommodated in the case can be prevented from protruding again from the case.

However, the medical needle relates to a medical needle in which a tube or the like protruding from the case is not connected to the rear portion of the needle base. If this configuration is applied to an indwelling needle to which a tube protruding from the case is connected, when the tube is pushed forward with respect to the case for some reason, the protrusion of the needle base is guided forward by the groove and pushed forward. As a result, the needle tip of the injection needle may protrude from the tip of the case.
Special table 2004-538103 gazette (front page etc.)

  The present invention aims to improve the indwelling needle, and more specifically, in order to eliminate the inconvenience, the injection needle once housed in the main body is pushed forward by a tube or the like connected to the needle base. Another object of the present invention is to provide an indwelling needle in which the needle tip does not protrude outward from the main body.

In order to achieve the object, the indwelling needle of the first aspect of the present invention can be punctured with the injection needle protruding from the cylindrical main body, and the needle tip of the injection needle is in the main body after use. An indwelling needle that is housed, and has a cylindrical needle base that fixes a rear portion of the injection needle, and is disposed on the outer peripheral side of the injection needle and is housed in the main body, and the needle base is disposed behind the main body. A coil spring that is biased to the tube, a tube that is connected to the needle base and is led out from the rear of the main body, engages with the needle base, holds the needle base at a front position of the main body, and moves away from the main body. Engagement means for releasing engagement with the needle base when moved in the direction, and the main body engages the front end portion of the coil spring with the front end portion and allows the injection needle to be inserted. The front wall portion provided with the front opening is disengaged from the engagement means. Has been at the rear end portion of the needle hub abuts against the time and a rear wall of the tube can be inserted behind the opening is provided, wherein the hub is a surface for receiving the rear end portion of the coil spring A rear inclined portion that inclines a rear end portion of the coil spring in a predetermined direction with respect to a surface perpendicular to the axial direction of the main body, and the front wall portion is formed with respect to a surface perpendicular to the axial direction of the main body. A forward inclined portion having an inclination symmetrical to the backward inclined portion of the needle base is provided, and the needle base is formed to be tiltable in the main body.

  According to the indwelling needle of the first aspect of the present invention, when the engagement between the engagement means and the needle base is released and the injection needle and the needle base are housed in the main body, the needle base Since the rear portion of the coil spring is inclined by the rear inclined portion provided on the coil spring, the coil spring is bent in an arcuate shape in the main body. Therefore, the urging force is applied to the needle base from an oblique direction by the bending of the coil spring. From this state, when the tube is pushed into the main body, the tube is pushed against the urging force of the needle base in the oblique direction by the coil spring. Will be pushed. Since the needle base is tiltable in the main body, the needle tip of the injection needle fixed in front of the needle base is pushed in a direction deviated from the front opening, and comes into contact with the front wall portion. It does not protrude from the front opening. Further, since the coil spring is a wire wound in a coil shape, when the coil spring is pushed forward in a bow shape, the needle tip of the injection needle is inserted between the wire materials, The needle tip is prevented from protruding from the front opening. As described above, the indwelling needle of the present invention can prevent the injection needle housed in the main body from projecting to the outside by a simple configuration in which the needle base is provided with the backward inclined portion.

In the indwelling needle according to the first aspect of the present invention, the front wall portion includes a front inclined portion having an inclination symmetrical to the rear inclined portion of the needle base with respect to a plane perpendicular to the axial direction of the main body. that features. By providing the front inclined portion on the front wall portion, the curvature of the coil spring is further emphasized when the injection needle and the needle base are housed in the main body. Therefore, since the force which urges | biases the said needle base diagonally is strengthened, the protrusion from the said front opening of the needle tip of the said injection needle can further be suppressed.

  Further, in the indwelling needle according to the first aspect of the present invention, the main body is configured to increase the inclination angle of the rear end portion of the coil spring when the engagement of the engagement means is released. It is preferable that an inclination guide part for inclining the base is provided. As described above, when the needle base is tilted when the needle base is moved to the rear position of the main body, the coil spring is further curved. For this reason, the protrusion of the needle tip of the injection needle from the front opening can be further suppressed. Further, in this case, it is only necessary to enhance the bending of the coil spring, so that it is not necessary to greatly tilt the needle base as in Patent Document 1. Therefore, even when the tilt guide portion is provided on the main body, the expansion of the main body in the circumferential direction can be minimized.

  In order to achieve the object, the indwelling needle of the second aspect of the present invention can be punctured with the injection needle protruding from the cylindrical main body, and the needle tip of the injection needle is the main body after use. An indwelling needle housed in a cylindrical needle base for fixing a rear portion of the injection needle; and an indwelling needle disposed on an outer peripheral side of the injection needle and housed in the main body. A coil spring that is biased rearwardly, a tube that is connected to the needle base and is led out from the rear of the main body, engages with the needle base, holds the needle base at a front position of the main body, and the main body Engagement means for releasing the engagement with the needle base when moved away from the needle base, the main body locking the front end of the coil spring at the front end and inserting the injection needle A front wall provided with a possible front opening and the engagement means; And a rear wall provided with a rear opening through which the tube can be inserted, and the front wall receives the front end of the coil spring. A front inclined portion for inclining a front end portion of the coil spring in a predetermined direction with respect to a surface perpendicular to the axial direction of the main body, and the needle base is formed to be tiltable in the main body. To do.

  The indwelling needle of the first aspect is characterized in that the backward inclined portion is provided on the needle base, whereas in the indwelling needle of the second aspect, the coil spring is inclined on the front wall portion. It is characterized by having a forward inclined portion. According to this configuration, similarly to the first aspect, the coil spring can be bent when the injection needle and the needle base are housed in the main body. Therefore, the needle tip of the injection needle can be prevented from protruding from the front opening.

  Further, in the indwelling needle according to the second aspect of the present invention, the main body is disposed after the coil spring with respect to a surface perpendicular to the axial direction of the main body when the engagement of the engagement means is released. It is preferable that a second inclination guide part for inclining the needle base in a direction in which an end part is inclined symmetrically with the front inclination part is provided. Since the second inclined guide portion is further provided, the coil spring can be further curved when the injection needle and the needle base are housed in the main body. The protrusion from the front opening can be further suppressed.

  Next, an example of an embodiment of the indwelling needle of the present invention will be described with reference to FIGS. 1 is an explanatory perspective view showing the indwelling needle of the first embodiment, FIG. 2 is an explanatory cross-sectional view showing a partial cross section of the II-II line of FIG. 1, and FIG. 4 is an explanatory cross-sectional view showing a cross-section of the housed state as viewed from above, FIG. 4 is an explanatory cross-sectional view showing a state where the injection needle and the needle base are housed in the main body, and FIG. FIG. 6 is an explanatory cross-sectional view showing a state when the indwelling needle of the second embodiment is viewed from a plane, and FIG. 7 is a view of the needle and the needle in the indwelling needle of the second embodiment. It is explanatory sectional drawing which shows the cross section which looked at the state in which the group was accommodated in the main body from the plane.

  First, the indwelling needle 1 of 1st Embodiment is demonstrated with reference to FIG. 1 thru | or FIG. In the present application, the direction indicated by the needle tip of the injection needle will be described as the front, and the direction in which the tube is connected will be described as the rear. As shown in FIG. 1, the indwelling needle 1 of the first embodiment is an indwelling needle that is directly punctured and placed in a patient. The injecting needle 2 and a cylindrical needle fixed to a rear portion of the injecting needle 2. A base 3, a cylindrical main body 4 holding the needle base 3, an engagement member 5 provided with a lever 5 a disposed above the main body 4, and a wing 6 projecting laterally from the main body 4 And a tube 7 led out from the rear of the main body 4. Further, as shown in FIG. 2, a coil spring 8 is built in the main body 4.

  The injection needle 2 is a stainless steel hollow needle that is generally widely used, and its rear portion is integrally molded with the needle base 3 and fixed.

  The needle base 3 is made of a synthetic resin, and as shown in FIG. 2, the first small diameter portion 3a that holds the rear portion of the injection needle 2 and the first small diameter portion 3a are located behind the first small diameter portion 3a. A second small-diameter portion 3b that holds the injection needle and a large-diameter portion 3c that is located behind the second small-diameter portion 3b and to which the tube 7 is connected are provided. As shown in FIG. 3, a rear inclined surface 3 d (rear inclined portion) that is inclined with respect to a surface perpendicular to the axial direction of the injection needle 2 is formed at the distal end portion of the large diameter portion 3 c. In addition, the outer diameter of the large diameter portion 3 c is smaller than the inner diameter of the main body 4, and the large diameter portion 3 c can be inclined to some extent within the main body 4. Further, the outer diameter of the second small diameter portion 3b is smaller than the inner diameter of the coil spring 8, so that the coil spring 8 can be freely deformed to some extent in the radial direction. As shown in FIGS. 2 and 3, when the needle base 3 is held at the front portion of the main body 4, the needle base 3 is biased toward the rear of the main body 4 by the coil spring 8. It has become.

As shown in FIG. 1, the main body 4 has a cylindrical shape as a whole, and a front wall portion 4a is provided at the front end portion, and the first small diameter portion 3a of the needle base 3 can be inserted into the front wall portion 4a. A front opening 4b is provided. Further, as shown in FIG. 2, a rear wall portion 4c is provided at the rear end portion, and a rear opening 4d through which the tube 7 can be inserted is provided in the rear wall portion 4c. Further, as shown in FIG. 3, an inclination guide portion 4 e having a gentle inclination on the inner peripheral surface is provided in the rear portion of the main body 4. As shown in FIG. 5, the inclination guide portion 4 e is provided with an inclination in a direction that further increases the inclination of the rear inclined surface 3 d of the needle base 3 when the needle base 3 is moved to the rear position of the main body 4. ing. As shown in FIG. 2, the main body 4 accommodates the second small diameter portion 3 b and the large diameter portion 3 c of the needle base 3 in a state where the needle base 3 is held at the front position, and further the coil spring 8. Is housed. The length of the main body 4 is such that the injection needle 2 and the needle base 3 can be accommodated therein as shown in FIG.
In the first embodiment, a front inclined portion 4f illustrated in FIG. 6 described later is provided (not shown). The front inclined portion may be formed by a step as shown in FIG. 6, or may be formed by an inclined surface such as the rear inclined surface 3d.

  As shown in FIG. 2, the engaging member 5 includes a lever 5 a that protrudes outward from the main body 4 and an engaging claw that protrudes into the main body 4 and engages the rear end portion of the large-diameter portion 3 c of the needle base 3. 5b. In the present embodiment, the engaging member 5 is an integrally molded product including the front wall portion 4 a of the main body 4 and constitutes a part of the main body 4. As shown in FIG. 1, the wing 6 extends laterally from the front portion of the main body 4, and is formed integrally with the main body 4 in this embodiment.

  As shown in FIG. 3, the coil spring 8 is mounted so as to surround the outer periphery of the second small diameter portion 3 b of the needle base 3 when the needle base 3 is locked at the front position of the main body 4. Yes. Further, the front end portion is in contact with the front wall portion 4 a and the rear end portion is in contact with the rear inclined surface 3 d of the needle base 3. As described above, the coil spring 8 is housed in an arcuately curved state inside the main body 4 as shown in FIG. 3 because the rear end thereof is in contact with the rear inclined surface 3d. The coil spring 8 also has a front end abutting against the front wall 4a of the main body 4 even when the needle base 3 is pushed into the rear position of the main body 4 as shown in FIGS. The length is such that the portion abuts against the rear inclined surface 3d.

  In the indwelling needle 1 of the present embodiment, the first small diameter portion 3a of the injection needle 2 and the needle base 3 protrudes from the front opening 4b of the main body 4 as shown in FIGS. The tube 7 is led out from the rear opening 4 d of the main body 4. In this state, the patient is punctured, and the body 4 is fixed to the patient's skin using the wings 6 to perform infusion or the like.

  When discarding the indwelling needle 1 of the present embodiment, the operator lifts the lever 5a away from the main body 4 as shown in FIG. Then, since the engaging claw 5 b of the engaging member 5 is disengaged from the rear end portion of the needle base 3, the needle base 3 is pushed rearward of the main body 4 by the biasing force of the coil spring 8. At this time, the coil spring 8 is inclined in the rear portion thereof by the rear inclined surface 3d provided on the needle base 3, so that the coil spring 8 is curved in the main body 4 as shown in FIG. The large-diameter portion 3 c of the needle base 3 is stored in an inclined manner in the main body 4 along an inclined guide portion 4 e provided in the vicinity of the rear end portion of the main body 4. Thereby, the curvature in the main body 4 of the coil spring 8 is further increased. The needle tip of the injection needle 2 is housed in the main body 4 and is pressed against the inside of the coil spring 8 according to the inclination of the needle base 3.

  Thus, when the tube 7 is pushed in the distal direction of the main body 4 for some reason in a state where the needle base 3 is pushed rearward, the needle resists the biasing force of the curved coil spring 8. Group 3 will be pushed. Further, the needle base 3 is inclined by the inclination guide portion 4e. Therefore, when the needle base 3 is pushed forward by the tube 7, the needle tip of the injection needle 2 provided in front of the needle base 3 moves laterally (upward in FIG. 5) from the front opening 4 b of the main body 4. ) And abut against the front wall 4a. Further, since the needle tip of the injection needle 2 is pressed against the inner surface of the coil spring 8, if the needle tip of the injection needle 2 moves forward in that state, the needle tip of the injection needle 2 enters between the wire rods of the coil spring 8. The tip is not guided by the front end opening of the coil spring 8, that is, the front opening 4 b of the main body 4. Thereby, the injection needle 2 once accommodated in the main body 4 is prevented from projecting outside from the main body 4 again.

  Next, a second embodiment of the present embodiment will be described with reference to FIGS. The indwelling needle 1 'of the second embodiment is similar in appearance to the indwelling needle 1 of the first embodiment shown in FIG. On the other hand, as shown in FIG. 6, in the indwelling needle 1 of the second embodiment, a front inclined portion 4 f is provided on the front wall portion 4 a of the main body 4. The front inclined portion 4f is formed by providing a convex portion protruding rearward at a part of the front wall portion 4a (downward in FIG. 6). In the second embodiment, since the tip end portion of the coil spring 8 is in contact with the front inclined portion 4f, it is housed in the main body 4 so as to bend upward in FIG. In addition, the inclined guide portion 4e (second inclined guide portion) is configured such that the rear end portion of the coil spring 8 is inclined by the front inclined portion 4f with respect to a plane perpendicular to the axial direction of the main body 4. And the needle base 3 is tilted so as to be symmetrical.

  In addition, the difference from the indwelling needle 1 of the first embodiment is that in the indwelling needle 1 ′ of the second embodiment, the rear base 3 d is not provided on the needle base 3. Since the other points are the same as those in the first embodiment, the same components as those in the first embodiment are denoted by the same reference numerals in the drawings, and detailed description thereof is omitted.

  Since the indwelling needle 1 ′ of the second embodiment is configured as described above, before and during use, as shown in FIG. 6, the injection needle 2 and the needle are inserted from the front opening 4b of the main body 4. The first small diameter portion 3 a of the base 3 protrudes, and the tube 7 is led out from the rear opening 4 d of the main body 4. In this state, the patient is punctured, and the body 4 is fixed to the patient's skin using the wings 6 to perform infusion or the like.

  When discarding the indwelling needle 1 ′ of the second embodiment, when the lever 5 a is lifted and the engaging claw 5 b of the engaging member 5 is removed from the rear end portion of the needle base 3 (see FIG. 4), the needle base 3 Is pushed behind the main body 4 by the urging force of the coil spring 8. At this time, the coil spring 8 is inclined in the front portion by the front inclined portion 4f provided in the front wall portion 4a, so that the coil spring 8 is curved in the main body 4 as shown in FIG. The large-diameter portion 3 c of the needle base 3 is stored in an inclined manner in the main body 4 along an inclined guide portion 4 e provided in the vicinity of the rear end portion of the main body 4. Thereby, the curvature in the main body 4 of the coil spring 8 is further increased. The needle tip of the injection needle 2 is housed in the main body 4 and is pressed against the inside of the coil spring 8 according to the inclination of the needle base 3.

  Therefore, also in the indwelling needle 1 ′ of the second embodiment, when the tube 7 is pushed in the distal direction of the main body 4 for some reason in a state where the needle base 3 is pushed backward of the main body 4, the above-mentioned first As in the first embodiment, the needle 2 is displaced from the front opening 4b of the main body 4 in the lateral direction (upward in FIG. 7) and comes into contact with the front wall portion 4a. The injection needle 2 is prevented from protruding from the main body 4 to the outside again.

Incidentally, in the above Symbol second embodiment is provided with only front side inclined section 4 f, not limited thereto, it may be provided with both a rear inclined surface 3d and the front inclined portion 4f. Moreover , although the front inclination part 4f is formed of the level | step difference, you may form not only in this but in an inclined surface like the back inclined surface 3d. In the above embodiment, a so-called winged needle having the wing portion 6 as an indwelling needle has been described as an example. However, the present invention is not limited thereto, and the indwelling needle without the wing portion may be used.

An explanatory perspective view showing an indwelling needle of a 1st embodiment. Explanatory sectional drawing which shows the partial cross section of the II-II line | wire of FIG. Explanatory sectional drawing which shows the cross section which looked at the state in which the needle | hook and the needle base were accommodated in the main body from the plane. Explanatory sectional drawing which shows the state in which the injection needle and the needle base were accommodated in the main body. Explanatory sectional drawing which shows the state which looked at the indwelling needle of FIG. 4 from the plane. FIG. 6 is an explanatory cross-sectional view showing a state in which the indwelling needle of the second embodiment is viewed from a plane. Explanatory sectional drawing which shows the cross section which looked at the state in which the needle | hook and the needle base were accommodated in the main body in the indwelling needle of 2nd Embodiment from the plane.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Indwelling needle, 2 ... Injection needle, 3 ... Needle base, 3d ... Back inclined surface (back inclination part), 4 ... Main body, 4a ... Front wall part, 4b ... Front opening, 4c ... Rear wall part, 4d ... Back Openings, 5 ... engaging members (engaging means), 7 ... tubes, 8 ... coil springs.

Claims (4)

The needle can be punctured in a state where the injection needle protrudes from the cylindrical main body, and after use, the needle tip of the injection needle is an indwelling needle stored in the main body,
A cylindrical needle base for fixing a rear portion of the injection needle, a coil spring disposed on the outer peripheral side of the injection needle and housed in the main body and biasing the needle base toward the rear of the main body, A tube connected to a needle base and led out from the rear of the main body; and the needle when engaged with the needle base and holding the needle base at a front position of the main body and moved away from the main body Engagement means for releasing the engagement with the base,
The main body locks the front end portion of the coil spring at the front end portion, and the front wall portion provided with a front opening through which the injection needle can be inserted, and the engagement means when the engagement is released. A rear wall provided with a rear opening capable of being inserted into the tube while contacting the rear end of the needle base,
The hub is provided with a rear inclined portion which is inclined in a predetermined direction rear end portion of the coil spring in the axial direction perpendicular to the plane of the body surface receiving the rear end portion of the coil spring,
The front wall portion includes a front inclined portion having an inclination symmetrical to a rear inclined portion of the needle base with respect to a plane perpendicular to the axial direction of the main body,
The indwelling needle, wherein the needle base is formed to be tiltable in the main body. The body, according to claim 1 in which engagement of said engaging means when it is released, characterized in that it comprises an inclined guide portion which is inclined in the direction of increasing the inclination angle of the rear end portion of the coil spring indwelling needle according to. The needle can be punctured in a state where the injection needle protrudes from the cylindrical main body, and after use, the needle tip of the injection needle is an indwelling needle stored in the main body,
A cylindrical needle base for fixing a rear portion of the injection needle, a coil spring disposed on the outer peripheral side of the injection needle and housed in the main body and biasing the needle base toward the rear of the main body, A tube connected to a needle base and led out from the rear of the main body; and the needle when engaged with the needle base and holding the needle base at a front position of the main body and moved away from the main body Engagement means for releasing the engagement with the base,
The main body locks the front end portion of the coil spring at the front end portion, and the front wall portion provided with a front opening through which the injection needle can be inserted, and the engagement means when the engagement is released. A rear wall provided with a rear opening capable of being inserted into the tube while contacting the rear end of the needle base,
The front wall portion includes a front inclined portion for tilting the front end portion of the coil spring in a predetermined direction with respect to a surface perpendicular to the axial direction of the main body on a surface receiving the front end portion of the coil spring, and the needle base is the main body An indwelling needle characterized in that it can be tilted inside. When the engagement of the engagement means is released, the main body is configured such that the rear end portion of the coil spring is inclined symmetrically with the front inclined portion with respect to a plane perpendicular to the axial direction of the main body. The indwelling needle according to claim 3 , further comprising a second inclination guide portion for inclining the needle base.

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