JP2011041689A - Medical needle with protector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a medical needle with a protector, capable of securely preventing a needle body housed within the protector from projecting again from the protector. <P>SOLUTION: The medical needle with the protector includes: the needle body 1 composed of a needle tube 2 and a hub 3 with a connecting tube part 31 to connect a flexible tube 5; the protector 4 which can house the needle body 1; a spring member 6 for energizing the needle body 1 backward; and a locking means 42 for locking the needle body 1 at a use position. When the lock of the needle body 1 by the locking means 42 is released, the needle body 1 is moved backward with the energization power of the spring member 6, and the front end of the needle tube 2 is retracted into the protector 4, wuile the connection tube part 31 projects from the rear end of the protector 4. The connection tube part 31 has a narrow part 33 at the rear end and a stepped part 34 in a place where the narrow part 33 is connected to the front end. The connection tube part 31 can be separated at the stepped part 34 by folding the narrow part 33 to the front end of the connection tube part 31 with the front end of the flexible tube fitted and connected to the narrow part 33 from outside. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a medical needle with a protector that can prevent erroneous puncture after use of the needle.

  Conventionally, a needle body comprising a needle tube having a sharp front end, a hub provided with a connecting tube portion supporting the rear end portion of the needle tube and connecting a flexible tube to the rear end, and a cylinder capable of storing the needle body -Shaped protector, a spring member built in the protector that urges the needle body backward against the protector, and the needle body is locked against the urging force of the spring member at the use position where the needle tube protrudes from the tip of the protector 2. Description of the Related Art A protector-equipped medical needle having a freely engaging means is known (see, for example, Patent Document 1).

  Here, the locking means of the prior art includes a lever rotatably mounted on the outer periphery of the front portion of the hub and a front end portion of a guide groove for the lever that extends in the front-rear direction of the peripheral wall portion of the protector. It is comprised by the latching groove part formed by making it bend. The locking means is configured to lock the needle body in the use position by engaging the lever with the locking groove.

  In the conventional medical needle with a protector, when the locking by the locking means is released after using the needle, the needle body moves backward by the biasing force of the spring member, and the front end of the needle tube is immersed in the protector. It is possible to prevent erroneous puncture by medical staff and disposal workers. Further, in the conventional medical needle with a protector, by forming a second locking groove portion bent in the circumferential direction at the rear end portion of the guide groove portion, and by engaging the lever with the second locking groove portion, The needle body can be locked at an immersion position where the front end of the needle tube is immersed in the protector. As a result, according to the conventional medical needle with a protector, the needle body once accommodated in the protector can be prevented from protruding from the protector again.

Japanese translation of PCT publication No. 2005-530540 (FIGS. 1 to 5)

  However, in the conventional medical needle with a protector, if a force that presses the needle body forward is applied to the flexible tube after the needle body is once stored in the protector, the needle body may protrude from the protector again. There is an inconvenience that there is.

  An object of the present invention is to provide a medical needle with a protector that can eliminate such an inconvenience and reliably prevent the needle body once accommodated in the protector from protruding from the protector again.

  In order to achieve such an object, the present invention provides a needle comprising a needle tube having a sharp front end and a hub provided with a connecting tube portion that supports a rear end portion of the needle tube and connects a flexible tube to the rear end. A main body, a cylindrical protector that can store the needle body, a spring member that is built in the protector and urges the needle body backward against the protector, and the needle body is spring-loaded at a use position where the needle tube protrudes from the front end of the protector. Locking means that can be locked against the biasing force of the member, and by releasing the locking by the locking means, the needle body moves rearward by the biasing force of the spring member, and the front end of the needle tube is the protector. In the medical needle with a protector that is immersed in the connecting tube portion and protrudes from the rear end of the protector, the connecting tube portion has a smaller diameter portion at the rear end portion that is smaller in diameter than the front end portion, and Portion where small diameter part connects to front end In the state where the front end portion of the flexible tube is fitted and connected to the small diameter portion, the small diameter portion is bent with respect to the front end portion of the connecting tube portion so as to be separable at the step portion. To do.

  The medical needle with a protector according to the present invention releases the locking by the locking means after use, causes the front end of the needle tube to be immersed in the protector by the biasing force of the spring member, and the connecting tube portion is connected to the protector. Project from the rear edge. In this state, the needle body is maintained in a state where the front end of the needle tube is immersed in the protector. Therefore, when the small-diameter portion is then bent with respect to the front end portion of the connecting tube portion, the connecting tube portion is broken along the stepped portion, and the flexible tube and the connecting tube portion are separated.

  Further, in the medical needle with a protector according to the present invention, the connection tube portion is circumferentially positioned at a position facing the front end portion of the flexible tube of the connection tube portion in a state where the front end portion of the flexible tube is externally connected. A groove portion may be provided, and the front end portion of the flexible tube may be bent with respect to the connecting tube portion so as to be separable at the circumferential groove portion. In this case, when the front end portion of the flexible tube is bent with respect to the connecting tube portion, the connecting tube portion is broken along the circumferential groove portion, and the flexible tube and the connecting tube portion are separated.

  In any of the above-described medical needles with a protector according to the present invention, the protector can store the needle body. Therefore, even if a pressing force is applied to the remaining portion of the connecting tube after the flexible tube is separated, the needle body is not pushed forward beyond being pushed into the protector, and is temporarily stored in the protector. It is possible to reliably prevent the needle body from protruding from the protector again.

  Furthermore, in the medical needle with a protector of the present invention, it is preferable that the stepped portion or the circumferential groove is accommodated in the protector when the needle body is locked at the use position. As a result, in the medical needle with a protector of the present invention, the stepped portion or the circumferential groove portion is protected by the protector during use, and there is no possibility of being broken by mistake.

  Furthermore, in the medical needle with a protector according to any of the aspects of the present invention, it is preferable that the protector is formed with a tapered portion that gradually decreases in diameter from the inner peripheral surface toward the rear end surface at the rear end portion. By providing the protector with the tapered portion, the portion having the smallest diameter of the tapered portion can be brought close to the stepped portion or the circumferential groove portion, so that the connecting pipe portion extends along the stepped portion or the circumferential groove portion. And can be easily broken.

The perspective view which shows one Embodiment of the medical needle with a protector in this invention. Explanatory sectional drawing which shows the structure of the medical needle with a protector shown in FIG. Explanatory sectional drawing which expands and shows the principal part of the medical needle with a protector shown in FIG. Explanatory sectional drawing which expands and shows the principal part of other embodiment of the medical needle with a protector.

  Next, embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

  As shown in FIGS. 1 and 2, the medical needle with a protector according to the present embodiment includes a needle body 1 including a metal needle tube 2 having a sharp front end and a hub 3 that supports a rear end portion of the needle tube 2. And a cylindrical protector 4 that can accommodate the needle body 1.

  The hub 3 is made of a hard resin such as ABS. A connecting pipe portion 31 is integrally formed at the rear end of the hub 3, and the front end portion of the flexible tube 5 is externally connected. The hub 3 is integrally formed with a flange portion 32 that is positioned in front of the connecting pipe portion 31 and bulges radially outward.

  The connecting pipe portion 31 includes a small diameter portion 33 having a smaller diameter than the front end portion at the rear end portion, and a step portion 34 at a portion where the small diameter portion 33 is connected to the front end portion. The connecting pipe part 31 is formed along the step part 34 by bending the small diameter part 33 with respect to the front end part of the connecting pipe part 31 in a state where the front end part of the flexible tube 5 is externally connected to the small diameter part 33. It is designed to be broken. As a result, the front end portion of the connecting pipe portion 31 and the flexible tube 5 are separable.

  The protector 4 is formed of a resin such as polypropylene, which is more elastic than the forming material of the hub 3, and a pair of wing pieces 41, 41 projecting outward is integrally formed at the front portion of the protector 4. . Further, the protector 4 includes a spring member 6 that is constituted by a coil spring that comes into contact with the flange portion 32 of the hub 3 from the front and biases the needle body 1 backward.

  The protector 4 further resists the urging force of the spring member 6 at a use position (position shown in FIGS. 1, 2 (a), and (b)) where the needle tube 2 projects from the front end of the protector 4. A lever 42 is provided as a locking means that can be locked. The lever 42 extends rearward along the outer surface of the protector 4 from the front end of the protector 4. A bifurcated claw portion 42a to be inserted into the inner space of the protector 4 is formed at the rear end of the lever 42, and the claw portion 42a is in a state where the needle main body 1 is in the use position. It engages with the rear surface. At this time, the step portion 34 is accommodated in the protector 4 and is protected so as not to break. A spring receiving portion 42 b with which the front end of the spring member 6 abuts is formed at the front end of the lever 42.

  Further, as shown in FIG. 2A, a taper portion 43 a that gradually decreases in diameter from the rear end surface toward the inside is formed at the rear end portion of the protector 4. Moreover, the taper part 43b which diameter-reduces gradually toward the rear-end surface from an inner peripheral surface may be formed in the rear-end part of the protector 4 as shown in FIG.2 (b).

  In the present embodiment, the protector-equipped medical needle includes an assembly of the needle body 1 and the spring member 6, the front end of the spring member 6 abuts against the spring receiving portion 42 b, and the rear surface of the flange portion 32 of the hub 3 is a claw portion. After assembling to the lever 42 so as to abut against 42a, the lever 42 is assembled to the protector 4 in a peelable manner.

  In the assembled state of the medical needle with a protector of the present embodiment, the needle body 1 is held in the use position by the lever 42. The medical needle with the protector punctures the patient with the needle tube 2 protruding from the front end of the protector 4, and then fixes the needle body 1 together with the protector 4 to the patient's puncture portion using the wing piece 41, and the needle tube 2 is left in place. In such a state, medical treatment such as infusion, blood transfusion and blood sampling is performed. At this time, since the stepped portion 34 is accommodated in the protector 4 as described above, the stepped portion 34 is not subjected to a pressing force causing bending deformation, and there is no possibility of breaking during the medical practice.

  After the use of the needle, as shown in FIG. 2 (c), the rear end of the lever 42 is pushed upward to disengage the claw 42a from the flange 32, so that the claw 42a and the flange 32 can be separated. Release the engagement. In this way, the urging force of the spring member 6 is activated, the needle body 1 moves elastically backward with respect to the protector 4, the front end of the needle tube 2 is immersed in the protector 4, and the connecting tube portion 31 protrudes from the rear end of the protector 4.

  Therefore, next, the front end portion of the flexible tube 5 is bent with respect to the front end portion of the connection tube portion 31 together with the small diameter portion 33 of the connection tube portion 31 to which the front end portion is externally fitted. Then, since the small-diameter portion 33 is smaller in diameter and weaker than the front end portion of the connecting pipe portion 31, the connecting pipe portion 31 is broken along the step portion 34 as shown in FIG. At this time, since the taper portion 43b that gradually decreases in diameter from the inner peripheral surface toward the rear end surface is formed at the rear end portion of the protector 4 as described above, the portion having the smallest diameter of the taper portion 43b. Since the stress can be concentrated using as a fulcrum, it can be easily broken along the stepped portion 34.

  Here, the front end portion of the flexible tube 5 may be bonded to the small diameter portion 33 of the connecting tube portion 31 via an adhesive. When the adhesive is used, depending on the type of adhesive, the small-diameter portion 33 to which the adhesive is applied is deteriorated and embrittled by the adhesive itself or the solvent of the adhesive. The small-diameter portion 33 is protected by the flexible tube 5 at the portion where the flexible tube 5 is fitted, and the embrittlement is not noticeable. The embrittlement becomes prominent in the portion exposed without being fitted. Therefore, in this case, by bending the front end portion of the flexible tube 5 together with the small diameter portion 33 of the connection tube portion 31 to which the front end portion is externally fitted, the front end portion of the connection tube portion 31 is bent. As shown in FIG. 3B, the connecting pipe portion 31 can be further easily broken along the step portion 34.

  Further, as another embodiment, without providing the small diameter portion 33 in the connecting pipe portion 31, as shown in FIG. 4A, at the position facing the front end portion of the flexible tube 5 of the connecting pipe portion 31, A circumferential groove 35 may be provided. The circumferential groove portion 35 is formed in a V shape in a sectional view, and a thin portion 36 is formed at the bottom thereof. In this case, when the needle body 1 is held at the use position by the lever 42, the circumferential groove portion 35 and the thin wall portion 36 are accommodated in the protector 4, so that they do not receive a pressing force that causes bending deformation, There is no risk of breakage during the medical practice.

  After the use of the needle, the engagement between the claw portion 42a and the flange portion 32 is released in the same manner as in the case shown in FIG. In this way, the urging force of the spring member 6 is activated, the needle body 1 moves elastically backward with respect to the protector 4, the front end of the needle tube 2 is immersed in the protector 4, and the connecting tube portion 31 protrudes from the rear end of the protector 4.

  Therefore, next, the front end portion of the flexible tube 5 is bent with respect to the front end portion of the connection tube portion 31 together with the rear end portion of the connection tube portion 31 to which the front end portion is externally fitted. Then, since the circumferential groove part 35 is formed in the position which faces the front-end part of the flexible tube 5 of the connection pipe part 31, and the bottom part becomes the thin part 36, the connection pipe part 31 is FIG. As shown in b), the thin portion 36 is broken and is broken along the circumferential groove portion 35. At this time, since the taper portion 43b that gradually decreases in diameter from the inner peripheral surface toward the rear end surface is formed at the rear end portion of the protector 4 as described above, the portion having the smallest diameter of the taper portion 43b. Thus, the connecting pipe portion 31 is held and can be easily broken along the circumferential groove portion 35.

  In any of the above-described embodiments, the protector 4 can accommodate the needle body 1, that is, the needle tube 2 and the hub 3 including the connection tube portion 31 at the rear end. As a result, even if a pressing force acts on the remaining portion (front end portion) of the connecting pipe portion 31 after the breakage, the needle body 1 is not pushed forward beyond being pushed into the protector 4. Therefore, it is possible to reliably prevent the needle body 1 once housed in the protector 4 from protruding from the protector 4 again.

  Moreover, after the said fracture | rupture, the protector 4 in which the needle tube 2 was accommodated, and the flexible tube 5 can be discarded separately. Here, the portion including the needle tube 2 that is a metal part needs to be accommodated as a medical waste in a dedicated container having penetration resistance, but the needle tube 2 is separated by separating the flexible tube 5 as described above. By using only the housed protector 4, the volume as waste can be reduced.

  As mentioned above, although embodiment of the medical needle with a protector of this invention was described with reference to drawings, this invention is not limited to this. For example, although the protector 4 provided with the wing piece 41 is used in the embodiment, it is also possible to use a protector not provided with the wing piece. In the present embodiment, the locking means is constituted by the lever 42 integrally formed with the protector 4. However, as in the prior art, the lever that is rotatably mounted on the hub and the engagement formed on the protector. It is also possible to configure the locking means with the stop groove.

  Furthermore, although the said embodiment demonstrated the indwelling needle which fixes the needle main body 1 to a patient's puncture part using the wing | blade piece 41, the indwelling needle of another form may be sufficient. As another type of indwelling needle, for example, an outer needle is provided on the bottom surface of a disk-shaped housing, fixed on the tissue on the bottom surface, and an inner needle and a flow path connected to the inner needle are provided therein. And those having a connecting pipe part connecting the flow path and the flexible tube on the side surface.

  Further, the present invention can be applied to a needle other than the indwelling needle instead of the indwelling needle that fixes the needle body 1 to the puncture portion of the patient using the wing piece 41. Examples of such needles other than the indwelling needle include a medical bottle needle punctured by a stopper such as a rubber stopper provided at a port of a container in which a chemical solution such as an infusion pack is stored. One end of a flexible tube is connected to the medical bottle needle, and the container and the flexible tube are connected by puncturing the bottle needle into a stopper to distribute the drug solution to the flexible tube. (For example, refer to JP 2007-236438 A).

  DESCRIPTION OF SYMBOLS 1 ... Needle main body, 2 ... Needle tube, 3 ... Hub, 31 ... Connection pipe part, 33 ... Small diameter part, 34 ... Step part, 35 ... Circumferential groove part, 36 ... Thin part, 4 ... Protector, 42 ... Lever (locking) Means), 43b ... taper part, 5 ... flexible tube, 6 ... spring member.

Claims (5)

A needle body consisting of a needle tube with a sharp front end, a hub that supports the rear end portion of the needle tube, and a connecting tube portion that connects a flexible tube to the rear end, and a cylindrical shape that can store the needle body A protector, a spring member built in the protector, for urging the needle body backward with respect to the protector, and a needle body that can be locked to a use position where the needle tube protrudes from the front end of the protector against the urging force of the spring member. The needle body is moved rearward by the biasing force of the spring member by releasing the locking by the locking means, and the front end of the needle tube is immersed in the protector, and the connecting tube portion is protected by the protector. In a medical needle with a protector that is projected from the rear end of the
The connecting tube portion includes a small diameter portion having a smaller diameter than the front end portion at the rear end portion, a step portion at a portion where the small diameter portion is connected to the front end portion, and the front end portion of the flexible tube is externally connected to the small diameter portion. A medical needle with a protector, wherein a small diameter portion is bent with respect to a front end portion of a connecting tube portion so as to be separable at a stepped portion.   The medical needle with a protector according to claim 1, wherein the step portion is housed inside the protector when the needle body is locked at the use position. .   2. The medical needle with a protector according to claim 1, wherein the connection pipe portion is circumferentially formed at a position facing the front end portion of the flexible tube of the connection tube portion in a state in which the front end portion of the flexible tube is externally connected. A medical needle with a protector, comprising a groove part, wherein the front end part of the flexible tube is bent with respect to the connecting pipe part so as to be separable at the circumferential groove part.   The medical needle with a protector according to claim 3, wherein the circumferential groove is housed inside the protector when the needle body is locked at the use position. needle.   5. The medical needle with a protector according to claim 1, wherein the protector has a taper portion that gradually decreases in diameter from an inner peripheral surface toward a rear end surface at a rear end portion. A medical needle with a protector.

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