JPH11128346A - Double needle having erroneous puncture preventive function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify a structure and to improve operability by sliding an outside needle from the enclosure position at the front end of an inside needle to a withdrawing position while the needle base of the inside needle held fixed to a syringe. SOLUTION: The outside needle 3 is detained to the 'withdrawing position' by detaining parts 7, 8 while the front end 91 thereof is held protected without projecting from the front end of the hollow cylindrical body 6 of the inside needle 2, the needle base of the inside needle 2 is connected to a tapered part 14 at the front end of the syringe. The outside needle 3 is then slid toward the front end to expose the front end 91 and the detaining parts 7, 8 are detained at the 'enclosure position'. The front end 91 of the outside needle 3 is pricked into a vial, etc., and a medicinal liquid is filled into the syringe by operating the inside cylinder of the syringe. The outside needle 3 is then pricked to the patient's skin to inject the medicinal liquid. The outside needle 3 removed from the skin after the injection is returned to the 'withdrawing position'. The operability is improved by this constitution.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

FIELD OF THE INVENTION The present invention relates to medical devices and, more particularly, to a hollow needle having a sharp distal end for piercing a patient's skin.

[0002]

2. Description of the Related Art Conventionally, when a person engaged in medical work such as a doctor or a nurse puts a needle used for a blood test or the like in an elongated cylindrical holder or the like, he or she accidentally stabs himself. There is a concern that the puncture may cause infection with a special virus. For this reason, syringes and the like having an erroneous puncture prevention function have been developed. For example, there are a syringe that draws a used needle into the housing of the syringe, a syringe that is configured to surround a used needle with a sleeve slidably mounted on an outer cylinder of the syringe, and the like. There is a problem that the structure is complicated and the cost is high and manufacturing is difficult. Japanese Patent Laid-Open Publication No. Hei.
There is one described in Japanese Patent No. 255848.

[0003] As disclosed in the publication, as shown in Fig. 8, a hollow needle 51 having a sharp distal end and a rod having a blunt tip attached so as to reciprocate in the lumen of the hollow needle 51 are disclosed. 52 and a housing 53. When the double needle 50 is positioned in the blood vessel of the patient, the tip of the rod 52 is located in the lumen of the hollow needle 51, and after the needle is removed from the patient, the double needle 50 Heavy needle 50
The needle base 54 is removed from the tapered portion 55 at the distal end of the syringe barrel, and a striker 56 extending beyond the base end of the housing 53 is struck to something, as shown in FIG.
The tip of the rod 52 located in one lumen extends beyond the tip of the hollow needle 51. Thus, the sharp tip of the hollow needle 51 is protected by the rod 52 having a blunt tip, thereby preventing erroneous puncture due to carelessness of the user.

[0004]

However, in the above method, the sharp distal end of the hollow needle 51 cannot be protected unless the needle base 55 of the hollow needle 51 is removed from the distal end taper portion 55 of the syringe. The handling is complicated and the operability is not good.

An object of the present invention is to provide a simple structure, low cost,
Another object of the present invention is to provide a double needle with good operability and a syringe equipped with the injection needle.

[0006]

That is, according to the present invention, a hollow cylindrical inner needle having a blunt tip, and a tip of the inner needle exposed from a position surrounding the tip of the inner needle, which is provided on the outer periphery of the inner needle and surrounds the tip of the inner needle. A hollow cylindrical outer needle slidable to a possible retracted position, and provided at the base ends of the inner needle and the outer needle with a locking portion capable of locking at a position surrounded by the outer needle and a retracted position. In the double needle, the inner needle is slid from a position surrounded by the outer needle to a retracted position while the needle base of the inner needle is connected to the syringe.

[0007] In this specification, the principle "proximal end"
Is the side closer to the hand to be operated, and the "tip" is the side farther from the hand, and is commonly used for each component.

The "protection" of "the sharp tip of the outer needle is protected" used in the present invention means that the sharp tip of the outer needle is not allowed to come into contact with the sharp tip in the longitudinal direction, making it difficult to puncture an object. Means being in a state.

Hereinafter, the "position surrounding the distal end of the inner needle" for the outer needle will be referred to as the "surrounding position", and the "retracted position at which the distal end of the inner needle can be exposed" will be abbreviated as the "retracted position".

Further, in the present invention, the "reverse taper portion" is used when the taper of the needle base has a gradient in a direction opposite to that of the needle base.
The "positive taper portion" is used when it has a gradient in the same direction as the taper of the needle base.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the injection needle of the present invention will be described, but the present invention is not limited thereto.

A feature of the present invention is that the sharp distal end of the outer needle is protected by sliding the outer needle in the proximal direction while the needle base of the inner needle is connected to the distal taper of the syringe. It is in the configuration. With this configuration, the sharp tip of the outer needle can be protected before the double needle is removed from the tip of the outer cylinder, so that operability is good and the structure is extremely simple. It has the advantage of being easy to manufacture and of being low in cost.

The details will be described below with reference to the drawings.

As shown in FIG. 1, the double needle according to the present invention generally comprises an inner needle 2 and an outer needle 3 which is provided on the outer periphery of the inner needle 2.

As shown in FIG. 3, the inner needle 2 is provided with a needle base 4 having a proximal end portion whose diameter is enlarged toward the proximal end and a rear end portion having a slight convex portion 5 at its peripheral edge. A hollow cylindrical member 6 having a blunt tip is fitted or adhered to the tip side of the needle base 4. Needle base 4 is 6
It conforms to the injection needle standards specified in the Ministry of Health and Welfare Notification No. 412 having a taper of / 100.

At the distal end of the needle base 4, a lockable locking portion 7 as a means for locking the outer needle 3, which will be described later, at the “surrounding position” and the “retracted position” adjacent or continuously.
Is provided.

Although the shape of the locking portion 7 is not particularly limited, the locking portion 7 has a shape that can be mutually locked with a lumen of a locking portion 8 of the outer needle 3 described later.

The locking by the locking portion 7 of the inner needle 2 and the locking portion 8 of the outer needle 3 is performed, for example, by the outer peripheral surface of the locking portion 7 of the inner needle 2 and the inner cavity of the locking portion 8 of the outer needle 3. May be screwed together with male and female screws provided on the inner wall. In this case, when the proximal end of the screw provided in the lumen of the locking portion 8 contacts the distal end of the screw of the inner needle 2, the outer needle 3 moves to the “surrounding position”. Is locked to
When the proximal end of the screw of the outer needle 3 comes into contact with the proximal end of the screw of the inner needle 2, the outer needle 3 is provided to be locked at the “retracted position”.

As another example, convex protrusions are provided on the outer peripheral surface of the inner needle 2 substantially apart from the base end side and the distal end side, and concave grooves corresponding to the convex protrusions are provided on the locking portions 8 of the outer needle 3. May be provided on the inner wall of the inner cavity, and may be locked by reversibly fitting the convex protrusion and the concave groove. That is, the outer needle 3 is locked at the “surrounding position” by fitting the concave groove on the base end side of the locking portion of the outer needle 3 with the convex protrusion on the distal end of the locking portion of the inner needle 2. The outer needle 3 is provided so as to be locked at the “retracted position” by fitting the concave groove on the base end side of the needle 3 locking portion with the convex protrusion on the base end side of the locking portion of the inner needle 3.

As another example, as shown in FIGS. 4 and 3, a protruding portion 11 is provided on the proximal end side of the lumen of the locking portion 8 of the outer needle 3.
Is provided, and the inner wall 83 on the distal end side 81 of the locking portion 8 is reduced in diameter toward the distal end. On the other hand, the locking portion 7 of the inner needle 2
The outer periphery of the tapered portion 73 has a diameter that is increased in the distal direction and forms a gradient, and a forward tapered portion 7 that is provided on the distal side with respect to the reverse tapered portion 73 and has a diameter that is reduced in the distal direction and forms a gradient.
8 are provided. Due to the frictional engagement between the inverted tapered portion 73 and the raised portion 11 of the outer needle 3, the outer needle 3 is placed in the "surrounding position".
The outer needle 3 is locked at the "retracted position" by frictional engagement between the positive tapered portion 78 of the inner needle 2 and the inner wall 81 of the outer needle 3.

However, the locking portions 7 and 8 of the double needle according to the present invention are not limited to the above-described embodiment, but may be any of the locking methods known in the art without departing from the gist of the present invention. It may be in a form. In addition, the locking portion 7 of the inner needle
May be formed integrally with the needle base 4,
It may be separate.

As shown in FIG. 4, the outer needle 3 has an engaging portion 8 which can be gripped by a finger when the outer needle 3 is slid. A hollow cylindrical upper member 9 having a sharp tip for piercing is inserted or bonded. The lumen of the proximal end portion 8 has a shape that can be mutually locked with the locking portion 7 of the inner needle 2.

The double needle of the present invention having the above-described configuration functions as follows.

As shown in FIG. 1, the sharp tip 9 of the outer needle locked in the "retracted position" by the locking portions 7, 8 described above.
1 is located in the middle of the inner needle upper member 6 of the inner needle;
Is prevented from contacting first from the longitudinal direction, so that it is difficult to puncture. Also, the outer needle 3 is locked by the locking portion 7 so that the outer needle 3 does not easily slide in the distal direction, thereby preventing the sharp distal end 91 of the outer needle 3 from being re-exposed.

As shown in FIG. 2, the outer needle 3 locked at the "surrounding position" by the locking portions 7 and 8 has a sharp tip 91 exposed so that it can be punctured by a person. . Further, the outer needle 3 is locked by the locking portions 7 and 8 to prevent the outer needle 3 from sliding in the proximal direction during use.

The hollow cylindrical upper members 6 of the inner needle 2 and the outer needle 3
The nine materials are made of stainless steel.

The material of the needle base 4 and the locking portion 7 of the inner needle 2 and the locking portion 8 of the outer needle 3 are as transparent as possible so that the state of the drug solution and blood to be sucked and discharged can be visually observed from the outside. Preferably made of synthetic resin, for example, polycarbonate,
It is preferably made of a synthetic resin such as polystyrene, polypropylene and polymethylpentene.

Next, referring to FIG. 1 and FIG.
How to use the heavy needle will be described in detail.

The double needle of the present invention is packaged in a packaging form (not shown) similar to a normal injection needle, such as a blister package. The double needle at the time of opening is stored in an elongated cylindrical holder (not shown).

The distal end of the outer needle 3 is at the “retracted position” as shown in FIG. 1, and the distal end 91 of the outer needle 3 is protected by the hollow cylindrical body 6 of the inner needle 2.

As shown in FIG. 1, the inner needle 2 of the double needle of the present invention
Needle base 4 is connected to the taper portion 14 at the tip of the syringe,
The outer needle 2 at the “retracted position” is slid in the distal direction to expose the distal end 91 of the outer needle 2 as shown in FIG. 2 and is temporarily locked at the “surrounding position”. When the sharp tip 91 of the outer needle 3 is inserted into a stopper such as a vial and the inner tube (not shown) in the syringe outer tube is pulled in the proximal direction to aspirate the drug solution in the vial, The drug solution is filled into the outer cylinder of the syringe via the distal end 91 of the outer needle 3 and the lumen of the hollow cylindrical body 6 of the inner needle 2. After the filling of the drug solution is completed, the outer needle 3 is punctured into the skin of the patient, and the drug solution in the outer tube passes from the inner space of the hollow tube 6 of the inner needle 2 to the inner tube 9 of the outer needle 3. Administered to the patient. After use, the outer needle 3 is withdrawn from the patient's skin,
Is slid in the proximal direction of the inner needle 2. Then, the blunt tip 21 of the inner needle 2 extends beyond the tip of the outer needle 3, and the locking portion 8 of the outer needle 3 is locked with the locking portion 7 of the inner needle,
The outer needle 3 is locked at the “retracted position”. Thereafter, the double needle is surrounded by an elongated cylindrical holder or the like.
The needle base 4 is pulled out from the tapered end portion 14 of the syringe and discarded. In this way, the sharp distal end 91 of the outer needle 3 is protected by the inner needle 2, thereby preventing erroneous puncture of a used injection needle.

[0032]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the double needle of the present invention will be described below.
This will be described in more detail with reference to the drawings. FIG. 1 shows the second embodiment of the present invention.
Front cross-sectional view when the outer needle of the heavy needle is at the “retracted position”,
FIG. 2 is a front sectional view of the double needle of the present invention when the outer needle is at the “surrounding position”, FIG. 3 is a front sectional view of the inner needle of the double needle of the present invention, and FIG. FIG. 5 is an enlarged sectional view showing a locking portion of the inner needle of the double needle according to the present invention. FIG. 6 is an enlarged view of the locking portion of the double needle of the present invention shown in FIG. 1, and FIG. 7 is an enlarged view of the locking portion of the double needle of the present invention shown in FIG.

As shown in FIG. 1 and FIG.
The heavy needle includes an inner needle 2 and an outer needle 3.

As shown in FIG. 3, the inner needle 2 has a needle base 4 made of polycarbonate having a proximal end portion whose diameter is increased toward the base end and a slight convex portion 5 at the rear end periphery. A hollow cylindrical member 6 made of stainless steel and having a blunt tip is fitted into the tip end of the needle base 4. The tip of the needle base 4 is provided with a locking portion 7 formed by molding with the needle base 4.

As shown in FIG. 3, the locking portion 7 of the inner needle 2 has a first locking portion 71 provided with a reduced diameter from the tip of the needle base 4 and a further reduced diameter than the first locking portion 71. The second provided
And a locking hand 72.

As shown in FIG. 5, the first locking portion 71 has a hollow cylindrical portion 74 having substantially the same diameter and a gradually enlarged diameter from near the distal end toward the distal end. A reverse taper portion 73 having a gradient opposite to that of the taper, and a substantially horizontal surface 77 extending from the reverse taper portion 73 in the distal direction.
It is composed of

The second locking portion 72 has a substantially horizontal surface 79 formed on the base end side, and a forward tapered portion 78 having a gradient in the same direction as the taper of the needle base 4 is formed ahead of the surface 79. ing. As shown in FIG. 4, the outer needle 3 has a locking portion 8 that can be gripped by a finger when sliding the outer needle 3, and a distal end of the locking portion 8 pierces the skin of the patient. The hollow cylindrical upper member 9 having a sharp tip 91 is fitted therein. The proximal end of the lumen at the distal end 81 of the engaging portion 8 has a diameter substantially equal to the outer diameter of the proximal end of the second engaging means 72, and is gradually reduced in diameter toward the distal end. ing. Locking portion 8 proximal end 8
The inner cavity of the second locking member 71 has substantially the same diameter as the outer diameter of the hollow cylindrical portion 74 of the first locking means 71, and an annular raised portion 11 is formed at the most proximal end thereof. The raised portion 11
As shown in FIG. 7, a tapered portion 111 and a flat portion 112 are provided continuously therewith. As shown in FIG. 6, the locking of the outer needle 3 to the “retracted position” is performed by the inner needle 2.
This is achieved by frictionally engaging the positive tapered portion 78 of the second locking portion 72 with the reduced inner wall 83 of the distal end 81 of the locking portion 8 of the outer needle 3. As the distal inner wall 83 of the locking portion 8 of the outer needle 3 is slid in the proximal direction, the tapered portion 78 is locked by frictional engagement while gradually increasing its frictional force. . The engagement by the frictional engagement prevents the outer needle 3 locked to the “retracted position” from easily sliding in the distal direction.

As shown in FIG. 7, the "surrounding position" of the outer needle 3
The annular raised portion 11 provided on the inner wall on the proximal end side 82 of the locking portion 8 of the outer needle 3 slides in the distal direction with the reverse tapered portion 73 of the first locking portion 71. The tapered portion 111 and the reverse tapered portion 73 of the raised portion 11 are locked by frictional engagement while gradually increasing the frictional force. The engagement by the frictional engagement prevents the outer needle from sliding toward the proximal end and also prevents the outer needle 3 that slides in the distal direction from being separated from the inner needle 2.

[0039]

As described above, according to the present invention, it is possible to protect the outer needle having a sharp tip with the inner needle while the needle base and the tapered portion at the tip of the syringe remain connected.
Immediately after the end of the treatment (injection), safety can be ensured, handling can be simplified, and an injection needle with good operability can be provided. Further, since the structure is extremely simple, manufacture is easy and an inexpensive injection needle can be provided. INDUSTRIAL APPLICABILITY The double needle of the present invention is applicable to existing syringes, and can provide a syringe having an erroneous puncture prevention function without changing the design of the syringe body.

[Brief description of the drawings]

FIG. 1 is a front sectional view showing a state where an outer needle of a double needle of the present invention is in a “retracted position”.

FIG. 2 is a front sectional view showing a state where the outer needle of the double needle of the present invention is at a “surrounding position”.

FIG. 3 is a front sectional view showing an inner needle of the double needle of the present invention.

FIG. 4 is a front sectional view showing an outer needle of the double needle of the present invention.

FIG. 5 is an enlarged sectional view showing a locking means of the inner needle of the double needle of the present invention.

FIG. 6 is an enlarged view of a locking portion of the double needle of the present invention shown in FIG.

FIG. 7 is an enlarged view of a locking portion of the double needle of the present invention shown in FIG.

FIG. 8 is a sectional view of a conventional double needle.

FIG. 9 is a front view of a conventional double needle.

[Explanation of symbols]

 2 Inner Needle 3 Outer Needle 4 Needle Base 5 Convex Portion 6 Hollow Cylindrical Body 61 Dull Tip 7 Locking Portion 71 First Locking Portion 72 Second Locking Portion 73 Reverse Tapered Portion 74 Cylindrical Cylindrical with Same Diameter Part 77 Horizontal surface 78 Positive taper portion 79 Horizontal surface 80 Steep slope 8 Locking portion 81 Distal side of locking portion 82 Base side of locking portion 8 83 Reduced diameter of locking portion 8 on its distal side Inner wall 9 hollow cylindrical body 91 sharp tip 11 ridge 111 taper 112 flat 50 double needle 51 hollow needle 52 rod 53 housing 55 taper 56 striker

Claims (3)

[Claims] A hollow cylindrical inner needle having a blunt tip;
A hollow cylindrical outer needle slidable from a position surrounding the distal end of the inner needle to a retracted position at which the distal end of the inner needle can be exposed; In a double needle having an end portion provided with a locking portion which can be locked at a position surrounded by the outer needle and a retracted position, a position at which the outer needle surrounds the needle base while the needle base of the inner needle is connected to the syringe. A double needle that slides to a retracted position. 2. The locking portion is provided at a proximal end portion of an inner needle and a proximal end portion of an outer needle. The outer circumference of the locking portion of the inner needle and the inner cavity of the locking portion of the outer needle. The double needle according to claim 1, wherein the outer needle is locked at the surrounding position and the retracted position by frictional engagement with the inner wall. 3. The locking portion of the inner needle has a reverse tapered portion on the outer periphery that expands in diameter in the distal direction and a positive taper portion that decreases in diameter in the distal direction on the distal side from the reverse taper portion. In the locking portion of the outer needle, a raised portion 11 is provided on the proximal end side of the lumen of the locking portion, and on the distal end side, an inner wall whose diameter is reduced toward the distal end is formed. The outer needle 3 is locked at a position surrounding the tip of the inner needle by frictional engagement between the reverse taper portion and the raised portion 11, and frictional engagement between the forward taper portion and the reduced-diameter inner wall is achieved. The double needle according to claim 2, wherein the outer needle (3) is locked at a retracted position where the tip of the inner needle can be exposed.