HK1086509B - Medical needle device with winged shield - Google Patents

Description

Medical needle device with winged shield

Technical Field

The present invention relates to a medical needle device, and more particularly, to a medical needle device with a winged shield for preventing needle-stick injury, in which a needle can be safely stored after use.

Background

Winged medical needle devices are widely used in therapies such as infusion, transfusion, extracorporeal blood circulation, and the like. As an example thereof, a winged indwelling needle as shown in fig. 8A and 8B is widely known. Such a winged indwelling needle has a configuration in which a needle 31 is held at the front end of a hub (hub)33 having a wing portion 32, and a transfusion tube 34 can be connected to the rear end of the hub 33. Reference numeral 35 denotes a needle cap attached to the needle 31. During infusion, wings 32 are secured to the arm or similar of the patient by adhesive tape or similar means, thus maintaining the insertion of needle 31.

Meanwhile, contamination and infection due to needle stick injuries of injection needles, insertion needles, etc. become a problem in medical centers. Particularly, recently, since hepatitis B, hepatitis C, HIV (human immunodeficiency virus), and the like have become common social problems, there is a need for a device that can effectively prevent the occurrence of accidents such as needle stick injuries and the like. To prevent needle stick injuries, various needle devices are known that have a structure in which a cylindrical shield is slidable relative to the needle. That is, by sliding the cylindrical shield, the injection needle can either be exposed or stored within the shield, and each of them can be slid into the shield for storage therein when the injection needle and insertion needle are disposed of after use.

The configuration of a winged injection needle device employing a structure for preventing needle-stick injury is described in, for example, JP H06(1994) -7861B, JP H05(1993) -300942a, U.S. patent No.4,170,933 and the like. Such winged needle devices provide wings on the outer surface of a slidable cylindrical shield and the wings can slide with the shield outside the needle. After use of the needle, the shield can be slid to cover the needle tip of the needle for preventing needle stick injuries.

When the winged indwelling needle is indwelling, the wing portion 32 is fixed as described above, and at the same time the tube 34 can be flexed and bent (curved). For example, in the case of a general winged indwelling needle, in most cases, the indwelling needle is temporarily fixed to the skin of a patient by an adhesive tape, and its state is that an unnecessary portion of the tube at the rear side of the wing is entangled.

On the other hand, in the case of the above-described conventional medical needle device with a winged shield having a needle-stick injury preventing function, the possibility of bending of the shield portion is not considered. To perform the function of preventing needle stick injuries, it is desirable that the shield portion be rigid and generally not bendable. Thus, as mentioned above, the bendable portion in the inserted state is only the tube portion at the rear side of the winged shield and is necessarily located at the rear end of the needle device. However, depending on availability in treatment, it is preferred that the winged shroud can be bent in the vicinity of the wing.

Disclosure of Invention

It is an object of the present invention to provide a medical needle device with a winged shield that can be bent at a position sufficiently close to the needle.

The medical needle device of the present invention includes: a winged shroud having a generally cylindrical shroud tube and a pair of wings connected to a forward end of the shroud tube; a shaft core inserted into the inner hole of the shield tube so as to be movable in the axial direction; and a needle mounted to the front end of the hub, wherein the infusion tube is connectable to the rear end of the hub and the needle tip is storable in the inner bore of the shield tube. In a state where the needle is locked to the shield tube by being projected from the front end of the shield tube and the insertion operation is enabled, both the shield tube and the shaft core can be bent over at least a part of the shield tube in the axial direction.

Drawings

Fig. 1 is a plan view showing the function of a medical needle device with a winged shield according to example 1.

Fig. 2 is a top sectional view of the medical needle device according to example 1.

Fig. 3 is a top sectional view showing another state of the medical needle device according to example 1.

Fig. 4 is a top cross-sectional view of a medical needle device with a winged shield according to example 2.

Fig. 5 is a top sectional view showing another state of the same medical needle device.

Fig. 6 is a plan view showing the function of the same medical needle device.

Fig. 7 is a top view of the medical needle device according to example 3.

Fig. 8A and 8B are plan views showing functions of a medical needle device with a winged shield according to a conventional example.

Detailed Description

The medical needle device of the present invention has a configuration in which the hub holding the needle is fitted into the inner hole of the winged shield, and a part of the shield tube can be bent together with the hub in a state in which the needle is projected from the leading end of the shield tube. Thus, in the inserted state, the winged shield can be bent close enough to the needle so that other needle devices can be easily inserted in the proper position.

In the medical needle device of the present invention, at least a part of the shaft core is made of a material having flexibility. Alternatively, the shaft core may have a structure in which the length of the shaft core may be set such that the rear end of the shaft core is located on the side closer to the front end of the shield tube than the rear end of the shield tube in a state in which the needle is projected from the front end of the shield tube and locked inside the shield tube.

The shield tube may be made of a material having flexibility.

In order to make the medical needle device bendable as described above, it may have a structure in which the shield tube includes an extendable portion configured to be extendable and contractible, the needle may be moved in the axial direction of the shield tube by extending and contracting the extendable portion, and the shield tube and the hub may be bent at the extendable portion. The extendable portion preferably has a plastically worked accordion structure.

Preferably, when the shield tube and the shaft core in the inner bore of the shield tube are bent together, the minimum radius of curvature at the bent portion may be 3mm or less.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

(example 1)

Fig. 1 is a plan view of a medical needle device according to embodiment 1 of the present invention. Reference numeral 1 denotes a needle fixed to the leading end of a resin-made shaft core 2. The tube 3 is connected to the rear end of the shaft core 2. Reference numeral 4 denotes a winged shroud including a generally cylindrical shroud tube 4a made of resin and left and right wing portions 5 and 6. The axially movable needle 1 and the hub 2 are inserted into the inner bore of the shield tube 4 a. The left wing 5 and the right wing 6 are provided at the front end portion of the shield tube 4a, i.e., at the end from which the needle 1 protrudes. Here, the wing portion is not necessarily located at the front end edge of the shield tube 4a, and may be located on a side closer to the front end of the shield tube 4a than the center of the shield tube 4a if appropriate. The wing portions 5 and 6 are respectively connected to both sides of the outer surface of the shield tube 4a, symmetrically to each other with respect to the axis of the shield tube 4 a. The shield tube 4a and the shaft core 2 are made of a flexible resin material.

In the state shown in fig. 1, the needle 1 protrudes from the shield tube 4a (can be inserted), and the shield tube 4a and the shaft core 2 are bent into a curve. Therefore, the shield tube 4a together with the shaft core 2 can be at least partially bent in the axial direction. In order to make the shield tube 4a and the shaft core 2 bendable, they are formed to have sufficient flexibility. Preferably, the bendable portion of the core 2 may not be folded at an acute angle but may be bent into a curve, thereby ensuring smooth flow of the drug solution. According to this structure, the medical needle device can be bent at a position sufficiently close to the needle 1. The flexibility of the shield tube 4a and the shaft core 2 can be adjusted according to the degree of bending required for the used embodiment, but if the minimum radius of curvature of the bendable portion is 3mm or less, it is generally sufficient for practical use.

Fig. 2 shows a sectional structure of the medical needle device in the axial direction. Through holes 9 and 10 are formed at the right and left sides of the side wall of the shield tube 4a at the front end thereof, respectively. Wing protrusions 7 and 8 corresponding to the through holes 9 and 10, respectively, are formed on the wings 5 and 6. Further, a rear-end locking portion 11 is formed on the rear-end inner surface of the shroud tube 4 a. The rear-end locking portion 11 includes a small-diameter portion 11a and an inward annular projection 11 b. The inward annular protrusions 11b are provided at predetermined intervals relative to the small diameter portion 11a, thereby forming annular grooves 11 c.

The shaft core 2 includes a clamping portion 2a formed at a front end portion thereof, and a stopper portion 2b formed at a rear end portion thereof. The outer diameter of the shaft core 2 may be equal to or slightly larger than the inner diameters of the small-diameter portion 11a and the inward annular projection 11b of the shield tube 4 a. According to an embodiment, the outer diameter of the core 2 may be slightly smaller than them. The outer diameter of the stopper portion 2b of the shaft core 2 is larger than the inner diameter of the small diameter portion 11a of the shield tube 4 a. Therefore, the movement of the shaft core 2 toward the front end of the shield tube 4a is restricted by the contact of the step portion formed by the stopper portion 2b and the small diameter portion 11a of the shield tube 4 a. The diameter of the holding portion 2a of the shaft core 2 is larger than the inner diameter of the inward annular projection 11b of the shield tube 4 a. The needle 1 can be covered by a needle cap 12 mounted on the front end of the hub 2.

When the winged shroud 4 is attached to the shaft core 2, the shaft core 2 is inserted from the leading end of the shroud tube 4a and moves toward the base end side. In this case, the stopper portion 2b first contacts the rear-end locking portion 11. Since the rear end side of the retainer portion 2b is provided with a taper as shown in the drawing, the shield tube 2 can easily pass through the rear end locking portion 11 due to the flexibility of the resin. As a result, the medical needle device is in the state shown in fig. 2. The shaft core 2 in fig. 2 is in the use position, in which the hour hand 1 projects from the front end of the shield tube 4a by a predetermined length. In this state, as described above, further movement of the needle 1 in the axial direction toward the front end is prevented by engagement of the stopper portion 2b and the small diameter portion 11 a.

Generally, the medical needle device is used in the state shown in fig. 2. The insertion operation is performed while gripping the wing parts 5 and 6 by hand. When the wing portions 5 and 6 are held by hand by lifting and stacking them up along the outer surface of the shield tube 4a, the wing portion protrusions 7 and 8 are inserted into the through holes 9 and 10, respectively, through the wall surface of the shield tube 4a, and project into the inner hole. As a result, the front ends of the wing projections 7 and 8 are brought into contact with the step portions formed at the rear of the clamp portion 2a of the spindle 2. Thus, the hub 2 is prevented from moving rearward, and the needle 1 can be held by the winged shield 4. During this operation, the needle 1 can be gripped with a force sufficient for the insertion operation, by pressing the two wings 5 and 6 so as to clamp them between the fingers.

When handling the medical needle device after use, in order to prevent needle-stick injuries, the tip portion of the needle 1 is stored in the shield tube 4a as shown in fig. 3. When the shaft core 2 is retracted from the position shown in fig. 2 toward the rear end of the shield tube 4a, the grip portion 2a first comes into contact with the inward annular projection 11 b. Since the holding portion 2a has a taper at its rear end, the holding portion 2a can easily pass the inward annular projection 11b by forcibly moving the core 2 further. When the holding portion 2a passes the inward annular projection 11b, as shown in fig. 3, the holding portion 2a engages with the annular groove 11 c. Because of this engagement, the hub 2 is prevented from moving in the axial direction within the shield tube 4a, thereby maintaining the state in which the needle 1 is stored within the shield tube 4 a. The above-described holding structure is one of examples, and a different structure may also be employed to hold the needle 1 in the shield tube 4 a.

(example 2)

A medical needle device with a winged shield according to example 2 is shown in fig. 4. The needle 21 is held in the inner bore of a cylindrical mandrel 22. The hub 22 includes a small diameter portion 22a on the needle 21 side and a large diameter portion 22b on the rear side of the small diameter portion 22 a. The needle 21 is clip-mounted to the small diameter portion 22 a. One of the end portions of the connecting tubule 23 is attached to the large diameter portion 22 b. The other end portion of the connecting tubule 23 is attached to the large diameter portion 24a of the cylindrical adapter 24. Therefore, the medical needle device has a structure in which the hub 22 and the adapter 24 are connected by the connecting tubule 23. The tube 25 is fitted to the small diameter portion 24b of the adapter 24. As described above, a continuous hole is formed from the tube 25 through to the needle 21. The shaft core 22 is made of a flexible resin material.

Reference numeral 26 denotes a cylindrical front side shield tube, and the needle 1 can move in an inner bore of the front side shield tube 26. The wing portion 27 is attached to the front side shroud tube 26 by a cylindrical portion on which the wing portion 27 pivots, and can rotate around the front side shroud tube 26. The movement of the wing portion 27 toward the needle tip is restrained by an outer surface step portion 26a provided on the outer surface of the front side shield tube 26. Further, the movement of the wing 27 to the base end is restricted by a wing stopper 28 provided on the rear portion of the front side shield tube 26.

Reference numeral 29 denotes an extendable portion made of polyethylene and having an accordion structure, one end of the extendable portion 29 being fixed so as to be fitted to the outer surface of the wing stopper portion 28, and the other end of the extendable portion 29 being fixed so as to be fitted to the outer surface of the large-diameter portion 24a of the adaptor 24. The shield tube is composed of an extendable portion 29 and a front-side shield tube 26. The front shield tube 26 can move outside the needle 21 due to the extension and contraction of the extendable portion 29. Therefore, the needle 21 can be covered and stored by the front side shield tube 26, or can be exposed. Further, the accordion structure is plastically processed so that it can maintain its state (free state) without external force after being extended and compressed by the external force. Thus, the extendable portion 29 can maintain the extended and retracted state of a desired length within the range of extension and retraction. As a result, the exposed length of the needle 21 exposed from the front shield tube 26 can be freely adjusted within a certain range.

The front-side shield tube 26 has an inner diameter that is small at its front end and slightly larger at a side closer to the rear end than the front end, and includes an inner surface step portion 26 b.

Fig. 5 shows a state in which the needle 21 is stored in the front side shield tube 26 by extending the extendable portion 29 of the injection needle device having the above-described structure. In this state, the needle 21 is restricted from protruding from the front shield tube 26. That is, the tip of the needle 21 contacts the inner surface step portion 26b of the front side shield tube 26, thereby preventing protrusion. In order to allow the needle 21 to protrude, the position of the tip of the needle 21 must be adjusted to be located in the hole at the front end of the front side shield tube 26 so that the possibility of unexpected protrusion is correspondingly small.

Fig. 6 shows the medical needle device according to the present embodiment in a state where the extendable portion 29 is bent. The extendable portion 29 may be curved as shown. The flexibility of the core 22 is arranged such that it can be bent at least at the extendable portion 29. In this state, the needle 21 is projected from the front shield tube 26 so as to be in an insertable state. Therefore, the medical needle device can be bent at a position sufficiently close to the needle 21.

As the extendable portion 29, a material capable of plastically extending and contracting may be used, and examples thereof include a material for a straw or the like, which can maintain an extended and contracted state. Specifically, polyolefins such as polyethylene and polypropylene, polyvinyl chloride resins, polystyrene thermoplastic elastomers, and the like are preferable. The material of the protector is not particularly limited as long as it is a needle base or a wing portion used for a conventional medical needle device. Further, the front side shield tube 26 and the wing portions 27 may be made of different materials preferable in usability or functionality. This is because the wings 27 generally need to be flexible to fit snugly against the patient's skin, and on the other hand, the front shield tube 26 needs to be rigid to allow for the gripping and storage of the needle 21.

In the embodiment of the present invention, preferably, when the extendable portion 29 and the shaft core 22 in the bore of the extendable portion 29 are bent together, the minimum radius of curvature at the bent portion can be 3mm or less.

(example 3)

Fig. 7 shows a medical needle device with a winged shield according to example 3. This embodiment is a modified example of embodiment 1. In the present embodiment, the length of the shaft core 2 is shorter than that in embodiment 1. That is, the length of the shaft core 2 is set so that, in the case where the needle 1 protrudes from the front end of the shield tube 4a and is locked inside the shield tube 4a, the rear end of the shaft core 2 may be located on the side closer to the front end of the shield tube 4a than the rear end of the shield tube 4 a. In this state, the shaft core 2 corresponds to only a part of the front end of the shield tube 4a in the axial direction, and only the tube 3 corresponds to the rear side portion of the shield tube 4 a. Therefore, when the shield tube 4a is bent, the tube 3 is bent accordingly, so that it can be easily wound. The length of the shaft core 2 is preferably set so that, in the case where the needle 1 protrudes from the front end of the shield tube 4a and is locked inside the shield tube 4a, the rear end of the shaft core 2 may be located on the side closer to the front end of the shield tube 4a than the center of the shield tube 4a in the axial direction.

The structure of the present embodiment is also applicable to the case where the thin tube 23 is connected to the rear side of the axial core 2 instead of the tube 3 as shown in fig. 6.

INDUSTRIAL APPLICABILITY

The medical needle device having the winged shield of the present invention can be bent into a curve at a position very close to the needle, and thus can be easily put in a state suitable for the use of the embodiment.

Claims (6)

1. A medical needle device with a winged shield, comprising:

a winged shroud having a generally cylindrical shroud tube and a pair of wing portions connected to a leading end side of the shroud tube;

a shaft core inserted into the inner hole of the shield pipe so as to be movable in the axial direction; and

a needle mounted to a front end of the shaft core,

the rear end of the shaft core can be connected with the transfusion tube and the tip part of the needle can be stored in the inner hole of the protective cover tube,

wherein both the shield tube and the shaft core are bendable over at least a part of the range of the shield tube in the axial direction in a state where the needle is locked to the shield tube by being protruded from the front end of the shield tube and an inserting operation is enabled.

2. The medical needle device according to claim 1, wherein the length of the shaft core is set so that, in a state where the needle is projected from the front end of the shield tube and locked in the shield tube, the rear end of the shaft core is located on a side closer to the front end of the shield tube than the rear end of the shield tube.

3. The medical needle device according to any one of claims 1 to 2, wherein the shield tube is made of a material having flexibility.

4. The medical needle device according to any one of claims 1 to 2, wherein the shield tube includes an extendable portion configured to be extendable and contractible, the needle is moved in an axial direction of the shield tube by extending and contracting the extendable portion, and the shield tube and the hub are bendable at the extendable portion.

5. The medical needle device according to claim 4, wherein the extendable portion has a plastically worked accordion structure.

6. The medical needle device according to claim 1, wherein when the shield tube and the shaft core in the inner hole of the shield tube are bent together, a minimum radius of curvature at the bent portion is 3mm or less.