JP7148297B2 - medical needle assembly - Google Patents

Description

The present invention relates to medical needle assemblies.

Medical needle assemblies (medical needles) include indwelling intravenous needles used for transfusion (infusion), etc., indwelling dialysis needles used in dialysis, and non-indwelling injection needles. In these medical needle assemblies, it is necessary to treat used medical needles in a safe condition.

Conventionally, the technique disclosed in Patent Document 1 is known as a technique for treating such used medical needles in a safe state.
A medical needle assembly (safety syringe) disclosed in Patent Document 1 is a safety syringe having a cannula (needle) attached to a hub attached to the mouth of the syringe. a winding cylinder that rotates about the winding shaft as a rotation axis; the cannula (needle) passes through a small hole provided in an upper wall of the winding cylinder; The cannula (needle) is wound around the winding shaft in the winding cylinder by rotating the winding cylinder with respect to the winding cylinder, and the tip of the cannula (needle) is drawn into the winding cylinder is configured as

Japanese Patent No. 3983884

By the way, in the case of an indwelling needle assembly including an indwelling intravenous needle or an indwelling dialysis needle, it is necessary to retract the inner needle to a safe position while the catheter of the outer trocar is fed into the blood vessel.
However, when the configuration of the safety syringe disclosed in Patent Document 1 is applied to an indwelling needle assembly, the winding cylinder (winding operation unit) that winds the inner needle around the winding shaft by rotating The direction of rotation interferes with the punctured patient, making it difficult to wind up the inner needle. As a result, there is a problem that it takes time to perform work from puncturing the patient's body surface with the medical needle to connecting the infusion circuit.

Therefore, the present invention provides a medical needle assembly that makes it easier to wind up an inner needle and improves workability from puncturing a patient's body surface with a medical needle to connecting an infusion circuit. intended to provide

In order to achieve the above object, the configuration of the medical needle assembly according to the present invention includes:
(1) an inner needle;
a winding shaft for winding the inner needle;
a winding cylinder housing the wound inner needle;
a winding operation unit provided on the winding shaft for rotating the winding shaft to wind the inner needle;
The axial direction of the rotation shaft of the winding operation unit is a direction substantially orthogonal to the longitudinal direction of the inner needle in the extended state and the puncture surface ,
A notch in the longitudinal direction is provided on the winding shaft side of the inner needle and/or on the side opposite to the winding shaft side .

The configuration (1) of the medical needle assembly of the present invention provides the following effects. That is, since the axial direction of the rotating shaft of the winding operation part is configured to be substantially orthogonal to the longitudinal direction of the extended inner needle and the puncture surface (body surface of the patient), the winding operation is performed. When rotating the part to wind the inner needle, the winding operation part does not interfere with the punctured patient. In addition, by providing a notch in the longitudinal direction on the winding shaft side of the inner needle and/or on the side opposite to the winding shaft side, the load when winding the inner needle can be reduced, so the inner needle can be Easier to wind up.
Therefore, according to the configuration (1) of the medical needle assembly of the present invention, since the inner needle can be easily wound, the operation from puncturing the body surface of the patient with the medical needle to connecting the infusion circuit, etc., can be performed. workability can be improved.

In the configuration (1) of the medical needle assembly of the present invention, it is preferable to have configurations such as the following (2) and (3) .

(2) An extension member extending in a direction perpendicular to the winding shaft is detachable from the winding operation section. According to the preferable configuration of (2) above, by using the extension member, the rotational load (torque) of the winding shaft can be reduced, and the inner needle can be more easily wound around the winding shaft. In addition, by removing the extension member after winding the inner needle around the winding shaft, the indwelling outer trocar does not become an obstacle, and the risk of accidentally touching the indwelling trocar and falling off can be reduced.

(3) further comprising an outer trocar covering the inner needle;
The winding operation unit retracts the tip of the inner needle into the outer trocar by half-rotating about the winding shaft, and further rotates about the winding shaft by half to retract the tip of the inner needle. up to the winding cylinder. According to the preferred configuration of (3) above, when the tip of the inner needle is inserted into the blood vessel, the winding operation section is rotated halfway to retract the inner needle into the outer trocar. By sending it inside, it is possible to suppress the rupture of the blood vessel. In addition, the inner needle can be housed in the winding cylinder by further rotating the winding operation part halfway (total one rotation) while the outer trocar is fed into the blood vessel, so that the winding operation part can be operated many times. No need to rotate. Therefore, according to the preferred configuration of (3) above, it is possible to further improve the workability from puncturing the patient's body surface with the medical needle to connecting the infusion circuit.

According to the present invention, since the inner needle can be easily wound, workability can be improved from puncturing the patient's body surface with the medical needle to connecting the infusion circuit.

FIG. 1 is a partially broken front view showing the configuration of a medical needle assembly according to one embodiment of the present invention. FIG. 2 is a plan view showing the configuration of a medical needle assembly according to one embodiment of the present invention. FIG. 3 is a partially broken front view for explaining the axial direction of the rotation shaft of the winding operation part (handle), which is a constituent member of the medical needle assembly in one embodiment of the present invention. FIG. 4 is a partially broken view showing the relationship between a winding shaft (shaft), a winding cylinder (main body), and a winding operation part (handle), which are constituent members of a medical needle assembly in one embodiment of the present invention. It is an exploded front view. FIG. 5 is a partially broken view showing the relationship between a winding shaft (shaft), a winding cylinder (main body), and a winding operation part (handle), which are constituent members of a medical needle assembly in one embodiment of the present invention. It is an assembly front view. FIG. 6 is a six-sided view showing the configuration of a winding shaft (shaft) that is a constituent member of the medical needle assembly in one embodiment of the present invention (wherein the rear view and right side view are the front view and left side view, respectively). (omitted because it appears symmetrical with the figure). 7A and 7B are six views showing the configuration of a winding cylinder (main body), which is a constituent member of the medical needle assembly according to one embodiment of the present invention (however, the rear view is omitted because it appears symmetrical to the front view). is. 8A and 8B are six views showing the configuration of the winding operation part (handle), which is a constituent member of the medical needle assembly in one embodiment of the present invention (however, the rear view is omitted because it appears symmetrical to the front view). is. FIG. 9 is a partially broken front view for explaining the configuration and usage of an extension member, which is a constituent member of the medical needle assembly in one embodiment of the present invention. FIG. 10 is a diagram showing a preferred configuration of an inner needle (metal inner needle) that is a constituent member of a medical needle assembly in one embodiment of the present invention ((a) is a front view, (b) is a plan view, ( c) is an enlarged view of the dashed-two dotted line circle portion M in (b)). 11A and 11B are diagrams showing another preferred configuration of the inner needle (metal inner needle) which is a constituent member of the medical needle assembly in one embodiment of the present invention ((a) is a front view, (b) is a plan view); , (c) is an enlarged view of a two-dot chain line circle portion N in (b)). FIG. 12 is a plan view for explaining how to use the medical needle assembly in one embodiment of the present invention. FIG. 13 is a partially broken front view for explaining how to use the medical needle assembly in one embodiment of the present invention.

Hereinafter, the present invention will be described in more detail using preferred embodiments. However, the following embodiments are merely examples embodying the present invention, and the present invention is not limited thereto.

(Configuration of medical needle assembly)
First, the configuration of a medical needle assembly according to one embodiment of the present invention will be described with reference to FIGS.

The medical needle assembly 1 shown in FIGS. 1 and 2 includes a metal inner needle 2, a shaft 3 as a winding shaft, a main body 4 as a winding cylinder, a handle 5 as a winding operation section, It has The metal inner needle 2 has its proximal end fixed to the shaft 3 . A shaft 3 is disposed within the body 4 and serves to wind the metal inner needle 2 . The main body 4 serves to accommodate the wound metal inner needle 2 . The handle 5 is provided on the shaft 3 and rotates (see arrow A in FIG. 1 and arrows B and C in FIG. 2) to rotate the shaft 3 and wind the metal inner needle 2 . As shown in FIGS. 1, 2, 12 and 13, when the handle 5 is rotated clockwise (arrow A in FIG. 1, arrows B and C in FIG. 2, arrows G and H in FIG. 12(a) , see arrows J and K in FIG. 12(b)), and the shaft 3 rotates to wind up the metal inner needle 2 (see arrow I in FIG. 12(a) and arrow L in FIG. 12(b)). . As a result, as shown in FIGS. 12(c) and 13, the wound portion of the inner metal needle 2 is accommodated in the main body 4, and the tip of the inner metal needle 2 is placed in the catheter hub 6b of the outer trocar 6. is evacuated to

As shown in FIGS. 1 and 2, the axial direction of the rotating shaft of the handle 5 is substantially orthogonal to the longitudinal direction of the extended metal inner needle 2 and the puncture surface (body surface of the patient). As shown in FIG. 3, the medical needle 7 is usually punctured at an angle of about 20 degrees with respect to the puncture plane (body surface of the patient). In this case, the direction substantially orthogonal to the puncture plane (body surface of the patient) is the direction inclined by about 70 degrees with respect to the puncture plane (body surface of the patient). The angle between the rotation axis of the handle 5 and the puncture plane (body surface of the patient) is not limited to 70 degrees, and may be any angle that does not interfere with the puncture plane (body surface of the patient). . For example, the angle may be 40 degrees or more and 85 degrees or less.

The configuration of the medical needle assembly 1 of this embodiment has the following effects. That is, since the axial direction of the rotating shaft of the handle 5 is configured to be substantially orthogonal to the longitudinal direction of the extended metal inner needle 2 and the puncture surface (body surface of the patient), the handle 5 can be When rotating and winding the metal inner needle 2, the handle 5 does not interfere with the punctured patient.
Therefore, according to the configuration of the medical needle assembly 1 of the present embodiment, the inner metal needle 2 can be easily wound. workability can be improved.

Further details will be described below. The medical needle 7 shown in FIGS. 1 and 2 is an indwelling intravenous needle and has a metal inner needle 2 and an outer trocar 6 . The trocar 6 comprises a catheter 6a and a catheter hub 6b. Catheter 6a consists of a flexible tubule made of polyurethane. The catheter hub 6b is a rigid cylindrical body made of polycarbonate, and is integrally formed in communication with the proximal end of the catheter 6a. The metal inner needle 2 is made of stainless steel, has a diameter that allows it to be inserted through the catheter 6a almost without a gap, and has a needle point P with a puncture blade. The catheter hub 6b is fixed to the catheter hub connecting portion 4b of the main body 4. As shown in FIG. The inner metal needle 2 is inserted through the catheter 6a, and its base end portion is fitted and fixed in the insertion hole 3a (see FIGS. 4 and 5) of the shaft 3. As shown in FIG.
Note that the trocar 6 may include a pair of left and right wing portions that are formed in the shape of elastically deformable plates. According to this configuration, after puncturing and winding the metal inner needle 2, the outer trocar 6 is firmly fixed to the patient by fixing the wings to the patient (patient's arm, hand, etc.) with an adhesive tape. becomes possible.

As shown in FIGS. 1, 2, 4, 5, and 7, the main body 4 is made of a polycarbonate hard material, and is a cylindrical storage container with an upper end opening for storing the wound metal inner needle 2. 4a. A cylindrical catheter hub connecting portion 4b that protrudes forward and communicates with the container 4a is integrally formed on the outer peripheral surface of the container 4a. A catheter hub 6b of a trocar 6 is fitted and fixed to the catheter hub connecting portion 4b while covering the catheter hub connecting portion 4b. In addition, a cylindrical infusion tube connecting portion 4c that protrudes rearward and communicates with the container 4a is integrally formed on the outer peripheral surface of the container 4a. One end of an infusion tube 8 made of a flexible polyurethane material is fitted and fixed to the infusion tube connecting portion 4c. The medical tube clamp 9 shown in FIGS. 1 and 2 is used to block an arbitrary portion of the infusion tube 8 when connecting the infusion circuit to the infusion tube 8 . Moreover, the connector 10 is a connection part with an infusion circuit. The medical tube clamp 9 is made of a polypropylene rigid plate, and the connector 10 is made of a polycarbonate rigid cylinder.

As shown in FIGS. 1, 4, 5, and 6, the shaft 3 is a rigid column made of polycarbonate, and is rotatably arranged within the container 4a of the main body 4. As shown in FIG. An insertion hole 3a for inserting and fixing the proximal end of the metal inner needle 2 is bored in the lower part of the shaft 3 while extending in the radial direction. A first annular recessed groove 3b is formed on the lower outer peripheral surface of the shaft 3 at the same height position as the insertion hole 3a, and the metal inner needle 2 can be wound around the first annular recessed groove 3b. ing. A square hole 3c is formed in the upper surface of the shaft 3 in the axial direction so that a square shaft portion 5d of a handle 5, which will be described later, can be detachably fitted therein (see arrow E in FIG. 4). An annular projection 3 d is formed on the upper outer peripheral surface of the shaft 3 , and a second annular groove 4 d is formed on the upper inner peripheral surface of the container 4 a of the main body 4 . As a result, when the shaft 3 is inserted into the housing container 4a (see arrow D in FIG. 4), the annular projection 3d is fitted into the second annular recessed groove 4d, and the shaft 3 is placed in the housing container. Prevention of coming off from 4a becomes possible. A third annular groove 3e is formed in the upper outer peripheral surface of the shaft 3 below the annular protrusion 3d, and an O-ring made of silicon or isoprene rubber is placed in the third annular groove 3e. 3f is inset. As a result, when the shaft 3 is inserted into the container 4a and placed therein, the O-ring 3f seals the space between the upper inner surface of the container 4a and the shaft 3, making it possible to prevent leakage of blood or infusion.

As shown in FIGS. 1, 2, 4, 5, and 8, the handle 5 is made of rigid polypropylene material. The handle 5 includes a truncated cone-shaped handle body 5a, left and right wings 5b and 5c, and an angular shaft portion 5d. The wings 5b, 5c extend horizontally from the handle body 5a. The square shaft portion 5d is formed on the lower surface of the handle body 5a and is detachably fitted into a square hole 3c formed in the upper surface of the shaft 3 (see arrow E in FIG. 4). The square shaft portion 5d of the handle 5 is fitted into the square hole 3c of the shaft 3, and the thumb and forefinger of the right hand are applied to the left and right wings 5b and 5c respectively to rotate the handle 5 clockwise, thereby rotating the shaft 3. The metal inner needle 2 can be wound up. The left and right wings 5b and 5c each have a concave curved shape on the rotational direction side. With such a configuration, it becomes easier to put the thumb and forefinger of the right hand on the left and right wings 5b and 5c, respectively, so that the rotational operability can be improved. In addition, in the case of a specification that rotates counterclockwise with the left hand, the curved shape of the left and right wings may be reversed. Since the handle is detachable, it is sufficient to prepare two types of handles, one for right-hand operation and the other for left-hand operation, so that the cost of the entire medical needle assembly can be suppressed.

As shown in FIG. 9, an extension member 12 extending in a direction perpendicular to the shaft 3 is detachable from the handle 5 (see double arrow F in FIG. 9). The extension member 12 has substantially the same shape as the handle 5 in appearance, and is a hollow body with a bottom opening that can be put over the handle 5 from above. According to such a configuration, by using the extension member 12 , the rotational load (torque) of the shaft 3 can be reduced, making it easier to wind the metal inner needle 2 around the shaft 3 . In addition, by removing the extension member 12 after winding the metal inner needle 2 around the shaft 3, the indwelled outer trocar 6 does not become an obstacle, and the possibility of accidentally touching the indwelled outer trocar 6 and falling off is reduced. can be done. The extension member 12 is made of the same hard polypropylene material as the handle 5 .

As shown in FIG. 10, the metal inner needle 2 is formed in a flat shape having a flat surface facing the outer peripheral surface of the shaft 3 when wound up. According to such a configuration, the load when winding the metal inner needle 2 can be reduced, and the metal inner needle 2 can be further easily wound. As shown in FIG. 11, the metal inner needle 2 may be provided with a notch 13 extending in the longitudinal direction at a portion other than the distal end (needle tip). With such a configuration as well, the load when winding the metal inner needle 2 can be reduced, making it easier to wind the metal inner needle 2 .

(How to use the medical needle assembly)
Next, a method of using the medical needle assembly according to one embodiment of the present invention will be described with reference to FIGS. 12 and 13 as well.

First, as shown in FIG. 3, the main body 4 is held with the thumb and forefinger of the right hand, and the needle tip P of the metal inner needle 2 is punctured into the puncture surface (body surface of the patient) and inserted into the blood vessel of the patient. do.

Next, as shown in FIG. 12(a), the main body 4 is held by the thumb and forefinger of the left hand, the thumb and forefinger of the right hand are placed on the left and right wings 5b and 5c of the handle 5, respectively, and the handle 5 is rotated half clockwise. (see arrows G and H in FIG. 12(a)). As a result, the metal inner needle 2 retreats (see arrow I in FIG. 12(a)) and stops at the center of the catheter 6a of the outer trocar 6 as shown in FIG. 12(b).

Next, with the metal inner needle 2 retracted into the catheter 6a of the outer trocar 6, the main body 4 is held with the thumb and forefinger of the right hand, and the catheter 6a is fed into the blood vessel. As a result, penetration of the blood vessel can be suppressed.

Next, with the catheter 6a of the trocar 6 being fed into the blood vessel in this way, as shown in FIG. with the thumb and forefinger of the right hand, respectively, and rotate the handle 5 clockwise by half a turn (a total of one turn) (see arrows J and K in FIG. 12(b)). As a result, the metal inner needle 2 is further retracted (see arrow L in FIG. 12(b)), and as shown in FIGS. 4, and the tip (needle point P) of the metal inner needle 2 is retracted into the catheter hub 6b, which is a safe position.

Finally, as shown in FIG. 1, an arbitrary portion of the infusion tube 8 is closed with a medical tube clamp 9, and the infusion circuit is connected to the infusion tube 8 via the connector 10. FIG. Thus, transfusion or the like can be performed through the catheter 6a placed in the blood vessel.

As described above, when the medical needle assembly 1 of this embodiment is used, the handle 5 does not interfere with the punctured patient when the handle 5 is rotated to wind the metal inner needle 2 . Therefore, the inner metal needle 2 can be easily wound, and the workability from puncturing the body surface of the patient with the medical needle 7 to connecting the infusion circuit, etc. is improved.
In addition, the inner metal needle 2 can be retracted into the catheter hub 6b, which is a safe position, by rotating the handle 5 once in total, and there is no need to rotate the handle 5 many times. Therefore, workability from puncturing the body surface of the patient with the medical needle 7 to connecting the infusion circuit, etc. is further improved.

In addition, in this embodiment, the case where the medical needle is an intravenous indwelling needle used for infusion (infusion) or the like has been described as an example. However, the present invention is not necessarily limited to such a configuration. The medical needle around which the inner needle is wound may be, for example, an indwelling dialysis needle used for dialysis, or other medical needle such as an injection needle that is not indwelled.

Further, in the present embodiment, the case where the handle (winding operation unit) 5 is detachably provided on the shaft (winding shaft) 3 has been described as an example. However, the present invention is not necessarily limited to such a configuration. The winding operation part may be provided integrally with the winding shaft.

Further, in this embodiment, the extension member 12 has an appearance that is substantially the same as the handle (winding operation portion) 5, and is a hollow body with a bottom opening that can be placed over the handle 5. An example of the case where However, the present invention is not necessarily limited to such a configuration. The extension member may be, for example, simply fitted into the left and right wings 5b, 5c of the handle 5. As shown in FIG.

Further, in the present embodiment, the case where the metal inner needle 2 is formed in a flat shape having a flat surface facing the outer peripheral surface of the shaft (winding shaft) 3 when wound is taken as an example. explained. However, the present invention is not necessarily limited to such a configuration. The shape of the inner needle is arbitrary as long as it can ensure a certain degree of strength during puncture and can reduce the load during winding. Moreover, the metal inner needle 2 may be a normal inner needle having a perfectly circular cross section.
Moreover, in this embodiment, the case where the notch 13 in the longitudinal direction is provided in the portion other than the distal end (needle point) of the metal inner needle 2 has been described as an example. However, the present invention is not necessarily limited to such a configuration. At least, a notch in the longitudinal direction should be provided on the shaft (winding shaft) 3 side of the metal inner needle 2 or on the side opposite to the shaft 3 side.

Further, in the present embodiment, the handle (winding operation unit) 5 rotates halfway around the shaft (winding shaft) 3 to move the tip of the metal inner needle 2 to the center of the catheter 6a of the outer trocar 6. By retracting and making another half rotation about the shaft 3, the wound portion of the metal inner needle 2 is accommodated in the main body (winding cylinder) 4, and the tip of the metal inner needle 2 (needle tip P ) is retracted into the catheter hub 6b of the trocar 6 as an example. However, the present invention is not necessarily limited to such a configuration. By shortening the lengths of the metal inner needle 2 and the outer trocar 6, or by increasing the diameters of the shaft (winding shaft) 3 and main body (winding cylinder) 4, the following operations can be performed. good. That is, by rotating the handle 5 halfway around the shaft 3, the tip of the metal inner needle 2 is retracted into the outer trocar 6, and by further rotating around the shaft 3 halfway, the tip of the metal inner needle 2 reaches the main body. 4 may be accommodated. Specifically, the length of the metal inner needle 2 is made substantially equal to the length of the circumference of the shaft 3 . As a result, the entire length of the metal inner needle 2 can be wound around the shaft 3 by rotating the handle 5 once.

1 medical needle assembly 2 metal inner needle 3 shaft (winding shaft)
3a Fitting hole 3b First annular groove 3c Square hole 3d Annular protrusion 3e Third annular groove 3f O-ring 4 Main body (winding cylinder)
4a housing container 4b catheter hub connecting portion 4c infusion tube connecting portion 4d second annular groove 5 handle (winding operation portion)
5a handle body 5b, 5c wing 5d square shaft 6 outer trocar 6a catheter 6b catheter hub 7 medical needle 8 infusion tube 9 medical tube clamp 10 connector 12 extension member 13 notch P needle tip

Claims (3)

inner needle;
a winding shaft for winding the inner needle;
a winding cylinder housing the wound inner needle;
a winding operation unit provided on the winding shaft for rotating the winding shaft to wind the inner needle;
The axial direction of the rotation shaft of the winding operation unit is a direction substantially orthogonal to the longitudinal direction of the inner needle in the extended state and the puncture surface ,
A medical needle assembly , wherein a longitudinal notch is provided on the winding shaft side and/or the side opposite to the winding shaft side of the inner needle . 2. The medical needle assembly according to claim 1, wherein an extension member extending in a direction perpendicular to said winding shaft is detachable from said winding operation portion. further comprising an outer trocar covering the inner needle,
The winding operation unit retracts the tip of the inner needle into the outer trocar by half-rotating about the winding shaft, and further rotates about the winding shaft by half to retract the tip of the inner needle. 3. The medical needle assembly according to claim 1 or 2 , which is housed in said winding cylinder up to a maximum.

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