WO2015067106A1

WO2015067106A1 - Butterfly needle

Info

Publication number: WO2015067106A1
Application number: PCT/CN2014/087386
Authority: WO
Inventors: 韩师亚; 林亮
Original assignee: 千禧光医疗有限公司
Priority date: 2013-11-11
Filing date: 2014-09-25
Publication date: 2015-05-14
Also published as: CN104623760B; CN104623760A

Abstract

Disclosed is a butterfly needle, which comprises a needle stand (12) and a needle cylinder (13) with a longitudinal axis, wherein the needle stand (12) is arranged in the needle cylinder (13) and can move to a retraction position from an extension position relative to the needle cylinder (13), the extension position being located at the distal side of the needle cylinder (13), and the retraction position being located at the proximal side of the needle cylinder (13). The butterfly needle further comprises an extension position locking device which can lock the needle stand (12) in the extension position in a releasable manner, and a retraction position locking device which can lock the needle stand (12) in the retraction position. After the use of the butterfly needle is completed, a needle head (11) thereof can be completely placed in the needle cylinder (13), thereby preventing the needle head (11) from causing an unexpected pricking wound.

Description

Butterfly needle

Technical field

The invention relates to a butterfly needle.

Background technique

In medical practice such as intravenous infusion, blood transfusion, blood collection, arterial and venous hemodialysis, intravenous infusion needles, intravenous blood transfusion needles, venous blood collection needles, arterial and venous hemodialysis needles, etc., which are traditionally called "butterfly needles", are usually arranged. In intravenous infusion, intravenous blood transfusion, intravenous vacuum blood collection, hemodialysis for arteriovenous catheters. The butterfly needle includes a needle for piercing the blood vessel and a needle cap that is placed over the needle. The needle cap prevents the needle from being damaged on the one hand, and prevents the needle from accidentally stabbing a person who may be in contact with the butterfly needle, such as a medical staff.

In order to prevent an infected needle from infecting a person, the medical staff must load the needle drawn from the blood vessel into the original needle cap.

However, with conventional butterfly needles, needles that are contaminated with the patient's blood cause considerable risk of accidental injury and infection by medical personnel and patients when the needle is withdrawn after clinical operation. Statistics show that the average number of accidental needle sticks per year for nursing staff is 2.42, of which 0.88 is contaminated needles; the average number of needles for doctors is 0.62 per person per year, and the number of contaminated needles is 0.38.

In order to provide a safe working environment for medical staff and prevent medical personnel from being infected with viruses due to accidental needle sticking, it is urgent to use a safety type butterfly needle. At present, some countries have enacted and mandated the clinical use of safety type needles.

Summary of the invention

Accordingly, the present invention provides a butterfly needle that includes a needle hub and a syringe having a longitudinal axis. The needle hub is disposed within the barrel and is moveable relative to the barrel from an extended position to a retracted position, the extended position being located distally of the barrel, the retracted position being located The proximal side of the syringe. The butterfly needle also includes a releasable An extended position locking device that locks the hub in the extended position and a retracted position locking device that can lock the hub in the retracted position.

The syringe includes a barrel wall defining a shape thereof, and the extended position locking means may include a through opening formed at a distal end of the barrel penetrating the barrel wall, on an outer circumference of the needle holder A locking groove formed on the upper surface and a latch member. The latch member is insertable into the locking recess of the hub through the through opening of the barrel and is detachable from the locking recess of the hub.

The retracted position locking device may include a locking groove formed on an outer circumferential surface of the needle hub and a locking projection extending toward a inside of the syringe cylinder on a proximal side of the syringe barrel, In the return position, the locking projection of the barrel is engaged in the locking recess of the hub.

In particular, the present invention provides a butterfly needle that includes a needle, a needle hub, and a syringe having a longitudinal axis. The hub includes a locking recess formed on an outer circumferential surface thereof, wherein the needle is coupled to a distal end of the hub. The syringe includes a syringe wall defining a shape of the syringe, a through opening formed at a distal side of the barrel and penetrating the barrel wall, and a needle penetrating the barrel wall to form the needle The proximal side of the barrel extends along the longitudinal axis of the barrel to open through the proximal end and the locking projection. The locking projection is formed on at least a section of the cylinder wall separated by the through groove and extends toward the inside of the barrel, and the locking projection is engageable in the locking groove of the needle holder . The butterfly needle also includes a latch member and a lock handle. The latch member is insertable into the locking recess of the hub through the through opening of the barrel and is detachable from the locking recess of the hub. The lock handle includes a handle portion that is operable by hand, a pivotal connection portion for pivotal connection with the syringe barrel wall, and a retaining cylindrical wall. One of the pivotal connection and the barrel wall includes a pivoting shaft, and the other of the pivotal connection and the barrel wall includes a pivoting groove, the pivoting shaft being pivotable The rotation is supported in the pivoting groove. The retaining cylindrical wall is formed toward the barrel wall at a portion of the lock lever movable relative to the barrel wall, which opens toward one side of the barrel wall to form two Open end. The latch member is formed on an inner surface of the retaining cylindrical wall and extends toward an opening between the open ends, The open end and a portion of the barrel wall include a retaining groove, the open end and another portion of the barrel wall including a retaining flange, the retaining flange being Separately engaged in the retaining groove. Wherein the needle hub is disposed within the barrel and is moveable relative to the barrel from a distal extended position to a proximal retracted position in which the needle extends a syringe for performing a medical operation and the retaining cylindrical wall of the lock handle receives and holds the syringe through an opening while the latch member is inserted into the hub through a through opening of the syringe wall In the locking recess, in the retracted position, the needle is completely retracted inside the barrel and the locking projection of the barrel is engaged in the locking recess of the hub.

The present invention also provides a butterfly needle comprising a needle, a needle hub and a syringe having a longitudinal axis. The hub includes a locking recess formed on an outer circumferential surface thereof, wherein the needle is coupled to a distal end of the hub. The syringe includes a syringe wall defining a shape of the syringe, a through opening formed at a distal side of the barrel and penetrating the barrel wall, and a needle penetrating the barrel wall to form the needle The proximal side of the barrel extends along the longitudinal axis of the barrel to open through the proximal end and the locking projection. The locking projection is formed on at least a section of the cylinder wall separated by the through groove and extends toward the inside of the barrel, and the locking projection is engageable in the locking groove of the needle holder . The butterfly needle also includes a latch member, a butterfly wing mountable on the syringe, and a lock handle. The latch member is insertable into the locking recess of the hub through the through opening of the barrel and is detachable from the locking recess of the hub. The butterfly wing includes a cylindrical mounting portion for mounting on an outer peripheral surface of the barrel, and the latch member is formed on an end surface of the cylindrical mounting portion by an elastic connecting member. The lock handle includes a handle portion that is operable by hand and a cylindrical sliding portion that is mounted on the barrel wall and that is slidable along the barrel wall. The sliding portion includes a pressing groove formed on a portion of the sliding portion facing the wall of the barrel. Wherein the needle hub is disposed within the barrel and is moveable relative to the barrel from a distal extended position to a proximal retracted position in which the needle extends a syringe for performing a medical operation and the pressing recess of the lock lever is in contact with the latch member and pressing the latch member through the through opening of the syringe into the locking recess of the hub In the slot, in the retracted position The needle is completely retracted inside the syringe and the locking projection of the barrel is engaged in the locking recess of the hub.

After the butterfly needle according to the present invention is used, its needle can be completely placed in the syringe to prevent the needle from causing an accidental stab wound.

DRAWINGS

1 is a perspective view of a butterfly needle according to a first embodiment of the present invention.

Figure 2 is a perspective view of the needle hub with the needle of the butterfly needle of Figure 1.

Figure 3 is a perspective view of the syringe of the butterfly needle of Figure 1.

Figure 4 is a perspective view of the lock handle of the butterfly needle of Figure 1 with a latch member.

Figure 5 is a cross-sectional view of the needle holder of the butterfly needle of Figure 1 in an extended position.

Figure 6 is a cross-sectional view of the needle holder of the butterfly needle of Figure 1 in a retracted position.

Fig. 7 is an enlarged cross-sectional view taken along line VII-VII of Fig. 6.

Figure 8 is a perspective view of a butterfly needle in accordance with a second embodiment of the present invention.

Figure 9 is an exploded perspective view of the butterfly needle of Figure 8.

Figure 10 is a perspective view of the lock handle of the butterfly needle of Figure 8.

Figure 11 is a cross-sectional view of the lock handle of the butterfly needle of Figure 8.

Figure 12 is a perspective view of the butterfly wing of the butterfly needle of Figure 8.

Figure 13 is a cross-sectional view of the needle hub of Figure 8 in the extended position.

Figure 14 is a cross-sectional view of the needle hub of Figure 8 in a retracted position.

detailed description

The butterfly needle of the present invention can be applied to, but not limited to, intravenous needles, intravenous blood transfusion needles, venous blood collection needles, and arterial and venous hemodialysis needles.

The contents of the present invention are explained by way of example with reference to the accompanying drawings. Those skilled in the art should understand that the illustrations are illustrative and are not intended to limit the invention.

1 is a perspective view of a butterfly needle in accordance with a first embodiment of the present invention. The butterfly needle includes a needle 11, a butterfly wing 16, a catheter 15, a clip 17, a Luer connector 18, and a cap 19. The technical solution provided by the present invention for the aforementioned technical problems does not involve These members, which can be used in the prior art, will not be described in more detail in the present invention.

As shown in FIG. 2, the butterfly needle also includes a needle hub 12. The proximal end of the hub 12 is known to be connected to the needle 11 as is known in the art, the distal end of which is coupled to the catheter 15 in a manner well known in the art. In the present invention, "proximal" refers to the side on which the patient is located or the side on which the needle 11 is located when the butterfly needle is used for the patient; "distal" refers to the side of the medical staff or the side away from the needle 11 .

See Figures 3, 5 and 6. The butterfly needle of the present invention also includes a syringe 13 having a longitudinal axis 130. The hub 12 is disposed within the barrel 13 and is movable relative to the barrel 13 from a distally extended position (Fig. 5) to a proximal retracted position (Fig. 6). As shown in Fig. 5, in the extended position, the needle 11 extends out of the syringe 13 for medical operation; as shown in Fig. 6, in the retracted position, the needle 11 is completely retracted into the interior of the syringe 13, avoiding the needle after use. 11 caused an accidental stab wound.

As shown in FIG. 2, the hub 12 includes a locking recess 121 formed on an outer peripheral surface 120 thereof. The locking groove 121 may be, for example, an annular groove formed on the outer circumferential surface 120 in the circumferential direction as shown in the drawing, or may be a single or discretely distributed two or more grooves (not shown).

In the present invention, "forming" may be formed integrally with the relevant features, being a corresponding portion of the whole; or the related features may be independent of each other and then joined to each other by, for example, splicing, bonding, threading or welding.

In the present invention, "...with a groove" (for example, a locking groove 121) or "... a projection" (for example, a locking projection 133 described below) or the like is Refers to grooves or bumps that have a corresponding use or function.

Figure 3 shows a syringe 13 in accordance with a first embodiment of the present invention. The syringe 13 includes a barrel wall 131 defining a shape thereof, a through opening 132 formed through the barrel wall 131 on the distal side (right side in the drawing) of the barrel, and a proximal side of the barrel (in the figure) The left side is a locking projection 133 that extends toward the inside of the barrel (see also Fig. 7). The locking projection 133 is engageable in the locking recess 121 of the hub 12, thereby constituting the retracted position locking device of the present invention together with the locking recess 121 for the retracted position of the hub 12 (Fig. 6) prevents the needle hub 12 from accidentally leaving from this position.

In the present invention, "joining" may be inseparable or separable. "Inseparable" means that the components that are joined together can be separated only in the case of a particularly large force (for example, a demolition); "separable" means that the components that are combined with each other can be separated from each other under normal force. Various separable or inseparable, e.g., snap-fit structures known in the art can be used as the member or structure for joining of the present invention. Details of these known structures are not described in the present invention.

As best shown in FIG. 7, the locking projection 133 and the locking recess 121 are rectangular or square-shaped right-angled faces in a longitudinal section along the longitudinal axis 130. According to another embodiment (not shown) of the present invention, the locking projection 133 and the locking recess 121 may be configured as a dovetail fit in a longitudinal section. Then, when the hub 12 is moved from the extended position shown in FIG. 5 to the retracted position shown in FIG. 6, once the locking projection 133 enters the locking recess 121, it cannot be locked with the locking recess 121. Separation, thereby more reliably locking the needle hub 12 with the needle 11 in the retracted position, more reliably prevents the used needle 11 from stabbing the person concerned.

It will be understood by those skilled in the art that the locking projections 133 and the locking recesses 121 can take any specific shape and the same or different numbers, and at least one pair can be joined together.

In the embodiment shown in FIG. 2, the locking groove 121 is an annular groove formed on the outer circumferential surface of the hub 12 along the circumferential direction. The annular groove facilitates the processing in some cases, and facilitates the entry of the locking projection 133 without the alignment of the locking projection 133 and the locking recess 121. It will be appreciated that the locking projection 133 may be either a flange formed at the proximal end of the barrel or one or a plurality of projections that are discretely distributed.

See Figure 2 and Figure 7. The locking recess 121 may be formed on the proximal side of the hub 12 (the right side of FIG. 2 and the left side of FIG. 7), and the edge of the proximal end 122 of the hub 12 may be formed with a chamfer 123; Alternatively (not shown), chamfering may be formed at the edge of the locking projection 133 of the syringe 13; alternatively, the proximal end 122 of the hub 12 and the edge of the locking projection 133 may be chamfered. When the existence of the chamfer causes the needle hub 12 to move from the extended position of FIG. 5 to the retracted position of FIG. 6, the locking projection 133 can be easily The proximal end portion 122 of the needle hub 12 is passed so that the locking projection 133 can easily enter the locking recess 121.

See Figure 3. As a preferred embodiment, in order to allow the locking projection 133 to easily enter the locking recess 121, a through groove 135 may be formed in the cylinder wall 131 of the syringe 13. A through slot 135 is formed through the barrel wall 131 proximal to the barrel 13 and extends along the longitudinal axis 130 of the barrel 13 and opens to the proximal end 134. In the example shown in FIG. 3, the through groove 135 further includes a portion extending circumferentially along the barrel wall 131, so that the through groove 135 is formed in a "T" shape. The present invention is not limited to the number and distribution of the through grooves 135, but it is preferable to form two or more symmetrically distributed through grooves 135. The through groove 135 extends and opens to the proximal end portion 134, and the proximal side of the syringe wall 131 is divided into a plurality of segments of the syringe wall. In particular, when there are two or more through grooves 135, the multi-segment syringe wall constitutes a cantilever structure. More easily deformed. The locking projections 133 are correspondingly formed on at least a section of the cylinder wall separated by the through grooves 135.

See Figure 4 and Figure 5. The butterfly needle according to the present invention further includes a lock handle 14. The lock handle 14 includes a handle portion 141 that is operable by hand and a pivotal connection portion 142 for pivotal connection with the syringe wall 131. In the illustrated example, the pivotal connection portion 142 of the lock lever 14 forms a pivoting recess 143 on which the pivot shaft 134 is formed. The pivot shaft 134 is pivotally supported in the pivoting recess 143 such that the lock lever 14 is rotatable relative to the syringe 13 about the pivot axis 134. Alternatively, the pivot shaft may be formed on the pivotal connection of the lock lever 14, and the pivoting groove may be formed on the barrel wall 131.

The lock handle 14 can also include a retaining cylindrical wall 144. The holding cylindrical wall 144 is opened toward one side of the barrel wall 131 to form two open end portions 145. A part of the barrel 13 can be received in the holding cylindrical wall 144 through the opening end portion 145, and is "held" or held by the holding cylindrical wall 144.

In order to hold the syringe 13 and the retaining cylindrical wall 144 together, as an alternative or a further preferred manner, a retaining flange 146 may be formed on the two open ends 145; correspondingly, in the syringe wall 131 A retaining groove 136 (Fig. 3) is formed thereon, and the retaining flange 146 can be detachably engaged in the retaining groove 136. It should be understood that a retaining groove may also be formed on the open end 145, while the syringe wall 131 A retaining flange is formed on the upper surface. Alternatively, a retaining flange is formed on one of the open ends, and a retaining groove is formed in the wall of the syringe corresponding thereto; and a retaining groove is formed on the other open end, correspondingly on the wall of the syringe A retaining flange is formed. That is, a part of the two open ends of the cylinder wall and the retaining cylindrical wall includes a retaining groove, and the other of the two open ends of the cylinder wall and the retaining cylindrical wall includes a retaining flange.

The retaining cylindrical wall 144 may be formed on a portion of the lock lever 14 that is movable relative to the syringe wall 131. In FIG. 4, the holding cylindrical wall 144 and the handle portion 141 are located on opposite sides of the pivotal connection portion 142. However, the holding cylindrical wall 144 may be formed on the handle portion 141.

The butterfly needle of the present invention also includes a latch member 147, i.e., a latch-like member. In the illustrated example, the latch member 147 is formed on the inner surface of the holding cylindrical wall 144 and extends toward the opening between the two open end portions 145. As shown in FIG. 5, while the syringe 12 is held by the holding cylindrical wall 144 through the opening end portion 145 and held by the holding cylindrical wall 144, the latch member 147 can be inserted through the through opening 132 of the syringe wall 131. The locking recess 121 of the hub 12 can be separated from the locking recess 121. This is easily accomplished, for example, as long as the size of the latch member 147 is made smaller than the locking recess 121, and the latch member 147 can take any shape.

The above-described latch member 147, the locking recess 121, and the through opening 132 on the barrel wall 131 constitute the extended position locking device of the first embodiment of the present invention for releasably locking the hub 12 in the figure. The extended position shown in Fig. 5 is because the latch member 147 can be separated from the locking recess 121 to release the hub 12.

It should be understood that the lock lever 14 is merely provided for facilitating the insertion and removal of the lock recess 121 by the latch member 147, and is not essential. In addition, the retaining cylindrical wall 144 can also be omitted, in which case the lock lever 14 can be formed on a portion of the lock lever 14 that is movable relative to the syringe wall 131.

Further, in order to prevent the needle hub 12 from rotating relative to the syringe 13 in the extended position, this may affect, for example, the action of the needle insertion into the meridians, as shown in Figures 4 and 2, which may be in the latch member 147 and the locking recess. A plurality of straight teeth or alternating plurality of ridges and grooves extending along the longitudinal axis 130 are formed on opposing surfaces of the slot 121. In this way, when When the member 147 is inserted into the locking groove 121, the ridges and grooves on the opposite surfaces of the two are engaged with each other, thereby preventing the two from moving, that is, rotating, orthogonal to the direction in which the ridge and the groove extend.

Referring to FIGS. 10 and 11, in order to facilitate the operation of the handle portion 201, a plurality of toothed projections 206 may be formed in the handle portion 201.

Next, the operation of the butterfly needle according to the first embodiment of the present invention will be described with reference to FIGS. 5 and 6.

As shown in Fig. 5, when the needle hub 12 is in the extended position, the needle 11 projects out of the syringe 13, at which time the handle portion 141 of the lock handle 14 is lifted upward by hand, so that the syringe 11 passes or squeezes the open end. The portion 145 enters the holding cylindrical wall 144 (Fig. 4), and as a result, the holding flange 146 on the opening end portion 145 is engaged in the holding recess 136 (Fig. 3) on the barrel wall 131, and at the same time, is formed. The latch member 147 on the top inner surface of the retaining cylindrical wall 144 is inserted into the locking recess 121 of the hub 12 through the through opening 132 in the barrel wall 131, whereby the hub 12 is releasably Lock in the extended position. Thus, the desired medical procedure can be performed with a butterfly needle.

See Figure 6. After the operation is completed, the handle portion 141 of the lock lever 14 can be pressed down by hand so that the retaining flange 146 is separated from the retaining recess 136, so that the retaining cylindrical wall 144 is separated from the syringe 13, and the result is formed for holding. The latch member 147 on the inner surface of the top of the cylindrical wall 144 is separated from the locking recess 121. At this time, the catheter 15 (or the hub 12) is pulled by hand to move the hub 12 toward the retracted position. During this process, the locking projection 133 on the barrel 13 passes over the proximal end 122 of the hub 12 into the locking recess 121, thereby locking the hub in the retracted position. Since the needle 11 on the needle hub is completely inside the syringe 13 in the retracted position, it is ensured that the used needle 11 does not accidentally stab the person concerned.

A butterfly needle according to a second embodiment of the present invention will be described below with reference to Figs. 8 through 14, wherein the same reference numerals as in Figs. 1 through 7 denote the same members. The second embodiment differs from the first embodiment mainly in the structure related to the extended position locking device, and the following description will focus on these different contents, and the same content will not be described again.

As shown in FIG. 13 and FIG. 14, the extended position locking device of the second embodiment of the present invention As in the first embodiment, a through opening 132 formed in the distal side of the barrel 13 penetrating the barrel wall 131, a locking recess 121 formed on the outer peripheral surface 120 of the hub 12, and a latch member 147 are also included. .

See Figure 9 and Figure 12. According to the second embodiment of the present invention, the butterfly wing 16 includes a cylindrical mounting portion 161 for mounting on the outer circumferential surface of the barrel 13. The latch member 147 is formed on the end surface 162 of the cylindrical mounting portion 161 by the elastic connecting member 163. The elastic connecting member 163 may be a cantilever beam which itself may be made of an elastic material or a non-elastic material.

In the second embodiment of the present invention, the lock lever 20 for facilitating the insertion of the latch member 147 into and out of the locking recess includes the handle portion 201 that can be operated by hand and the sliding portion that can slide along the syringe wall 131. 204. In the example shown in Fig. 10, the sliding portion 204 has a tubular shape, but may be any structure suitable for being attached to the syringe 13 for sliding.

The pressing recess 202 formed on the portion of the sliding portion 204 facing the barrel wall 131 acts as a pressing in contact with the latch member 147 and presses the latch member 147 into the locking recess 121 of the hub 12. structure. One end of the contact latch member 147 of the pressing recess 202 is formed with a chamfer 203 to facilitate pressing the latch member 147 toward the barrel wall 131.

See Figure 11 and Figure 14. A first limiting projection 205 extending toward the barrel wall 131 is formed in the pressing recess 202, and correspondingly, a second limit extending toward the pressing recess 202 is formed in the barrel wall 131. The position uses a protrusion 137. When the first limiting projection 205 and the second limiting projection 137 are in contact with each other, the range of movement of the lock lever 20 away from the butterfly wing 16 can be defined.

Next, the operation of the butterfly needle according to the second embodiment of the present invention will be described with reference to FIGS. 13 and 14.

As shown in Fig. 13, when the needle hub 12 is in the extended position, the needle 11 extends out of the syringe 13, at which time the handle portion 201 of the lock handle 20 is pushed by hand so that the lock handle 20 is directed toward the butterfly wing along the syringe 13. 16 sliding, the chamfer 202 on the end of the pressing recess 202 of the lock handle 20 contacts the latch member 147 on the butterfly wing 16 and presses the latch member 147 through the through opening 132 in the barrel wall 131 into the hub. The locking groove 121 of the 12 is such that the needle hub 12 is releasably locked in the extended position, so that the butterfly needle can be used for the desired Medical operation.

See Figure 14. After the operation is completed, the handle portion 201 of the lock handle 20 can be reversely pushed by hand, so that the lock lever 20 is separated from the lock member 147, and the latch member 147 is separated from the lock recess 121 by the elastic action of the elastic connecting member 163. At this time, the catheter 15 (or the hub 12) is pulled by hand to move the hub 12 toward the retracted position. During this process, the locking projection 133 on the barrel 13 passes over the proximal end 122 of the hub 12 into the locking recess 121, thereby locking the hub in the retracted position and completely locking the needle 11 It is housed inside the syringe 13 to ensure that the used needle 11 does not cause accidental puncture.

The specific embodiments of the present invention have been described above by way of example with reference to the accompanying drawings. The above description is intended to explain the principles of the invention and not to limit the scope of the invention. Various modifications and variations of the embodiments described above will be apparent to those skilled in the <RTIgt; These modifications and variations fall within the scope of the invention.

For example, in the embodiment shown in the drawings, the locking projection 133 (retracted position locking means) and the latch member 147 (extended position locking means) share the locking recess 121 on the needle holder 12, but The needle hub 12 may also be formed with different locking recesses in the longitudinal direction for engaging the locking projections 133 and the latch member 147, respectively.

Claims

A butterfly needle that includes:

Needle seat

a syringe having a longitudinal axis, the needle hub being disposed within the barrel and movable relative to the barrel from an extended position to a retracted position, the extended position being located distally of the barrel The retracted position is located proximal to the syringe;

An extended position locking device capable of releasably locking the hub in the extended position;

A retracted position locking device capable of locking the hub in the retracted position.
The butterfly needle of claim 1 wherein said barrel includes a barrel wall defining a shape thereof, said extended position locking means comprising:

a through opening formed in the distal side of the barrel through the wall of the barrel;

a locking groove formed on an outer circumferential surface of the hub;

a latch member that can be inserted into the locking recess of the hub through the through opening of the barrel and can be separated from the locking recess of the hub.
The butterfly needle according to claim 2, wherein said extended position locking means further comprises a lock handle, said lock handle including a handle portion operable by hand and a pivotal connection with said syringe wall A pivoting connection, the latch member being formed toward the barrel wall on a portion of the lock lever that is movable relative to the barrel wall.
The butterfly needle according to claim 3, wherein one of the pivotal connection portion of the lock lever and the barrel wall includes a pivot shaft, a pivotal connection portion of the lock handle, and the barrel wall The other includes a pivoting groove that can be pivotally supported in the pivoting groove.
A butterfly needle according to claim 3, wherein said lock lever further includes a retaining cylindrical wall, said retaining cylindrical wall being formed toward said cylinder wall at said lock lever capable of being opposite said a portion of the wall of the syringe that is open toward one side of the wall of the barrel to form two open ends, the latch member being formed on the inner surface of the cylindrical wall for holding and extending toward the center Opening between the open ends, the cylinder wall can pass the protection The opening end portion of the holding cylindrical wall enters the holding cylindrical wall and is held by the holding cylindrical wall, and the latch member can be inserted into the needle holder through the through opening of the barrel wall The lock is in the groove.
The butterfly needle according to claim 5, wherein a part of the two open ends of the cylinder wall and the holding cylindrical wall includes a retaining groove, the cylinder wall and the retaining The other of the two open ends of the cylindrical wall includes a retaining flange that can be detachably engaged in the retaining groove.
The butterfly needle according to claim 2, wherein the opposite surfaces of the locking member and the locking recess of the hub are formed with alternating ridges extending along a longitudinal axis of the hub And grooves.
A butterfly needle according to claim 2, said extended position locking means further comprising a butterfly wing mountable on said barrel, said latch member being formed on said butterfly wing by an elastic connecting member.
The butterfly needle according to claim 8, wherein the butterfly wing includes a cylindrical mounting portion for mounting on an outer peripheral surface of the barrel, and the latch member is formed on an end surface of the cylindrical mounting portion .
A butterfly needle according to claim 8, wherein said extended position locking means further includes a lock handle, said lock handle including a handle portion operable by hand and a sliding portion slidable along said syringe wall, The sliding portion includes an extruded structure that contacts the latch member and presses the latch member into the locking recess of the hub.
The butterfly needle according to claim 10, wherein the pressing structure includes a pressing groove formed on a portion of the sliding portion facing the barrel wall.
A butterfly needle according to claim 11, wherein one end of said pressing recess that contacts said latch member is formed with a chamfer to facilitate pressing said latch member toward said syringe wall.
A butterfly needle according to claim 11, wherein said pressing recess is formed with a first restricting projection extending toward said cylinder wall, said cylinder wall being formed toward said pressing a second limiting protrusion extending from the groove, the first limiting protrusion and the second limiting protrusion being capable of contacting each other to define the locking handle away from the butterfly wing Range of motion.
The butterfly needle of claim 1 wherein said retracted position locking means comprises:

a locking groove formed on an outer peripheral surface of the hub; and

a locking projection extending toward the inside of the barrel at a proximal side of the barrel, and in the retracted position, a locking projection of the barrel is engaged in a locking groove of the hub .
The butterfly needle according to claim 14, wherein the locking projection and the locking recess are fitted at right angles in a section along the longitudinal axis direction.
The butterfly needle according to claim 14, wherein the locking projection and the locking recess are fitted in a dovetail surface in a section along the longitudinal axis direction.
The butterfly needle according to claim 14, wherein a locking recess of the hub is located on a proximal side of the hub, and an edge of the proximal end of the hub is chamfered to cause the needle The locking projection of the cartridge can easily enter the locking recess of the hub when the hub is moved from the extended position to the retracted position.
A butterfly needle according to claim 14, wherein a locking projection edge of said syringe is chamfered so that a locking projection of said syringe is advanced from said extended position to said needle holder It can be easily entered into the locking groove of the needle holder when the retracted position is moved.
The butterfly needle according to claim 14, wherein a wall of the proximal side of the barrel is formed with a through groove, and the through groove penetrates the wall of the barrel to be formed on a proximal side of the barrel. Extending along the longitudinal axis of the barrel and opening at the proximal end.
The butterfly needle according to claim 19, wherein two or more symmetrically distributed through grooves are formed in the wall of the barrel.
The butterfly needle according to claim 19, wherein the through groove further includes a portion extending circumferentially along the wall of the barrel such that the through groove has a "T" shape.
The butterfly needle according to claim 19, wherein the locking projection of the barrel is formed on at least a section of the cylinder wall separated by the through groove.
A butterfly needle according to claim 2 or 14, wherein the needle holder is locked The groove is an annular groove formed on the outer peripheral surface of the hub in the circumferential direction.
A butterfly needle that includes:

Needle

a needle hub, the needle hub including a locking groove formed on an outer circumferential surface thereof, wherein the needle is coupled to a distal end of the needle hub;

a syringe having a longitudinal axis, the syringe comprising:

a cylinder wall defining the shape of the syringe,

a through opening formed at a distal side of the barrel and penetrating the barrel wall

a through groove formed through the wall of the syringe on a proximal side of the barrel, extending along a longitudinal axis of the barrel and opening at a proximal end, and

a locking projection formed on at least a section of the cylinder wall separated by the through groove and extending toward an inside of the barrel, the locking projection being engageable at the needle seat Locking groove;

a latching member capable of being inserted into the locking recess of the hub through the through opening of the barrel and capable of being separated from the locking recess of the hub;

a lock handle, the lock handle comprising:

a handle portion that can be operated by hand,

a pivotal connection for pivotal connection with the barrel wall, wherein one of the pivotal connection and the barrel wall includes a pivoting shaft, the pivotal connection and the barrel wall The other of the includes a pivoting groove, the pivot shaft being pivotally supported in the pivoting groove, and

Holding a cylindrical wall formed toward the barrel wall on a portion of the lock handle movable relative to the barrel wall, facing one of the barrel walls a side opening forming two open ends, wherein the latch member is formed on an inner surface of the retaining cylindrical wall and extends toward an opening between the open ends, the open end and the A portion of the wall of the syringe includes a retaining groove, the open end and another portion of the wall of the syringe including a retaining flange, the retaining flange being capable of Separably engaged in the retaining groove,

Wherein the needle hub is disposed within the barrel and is moveable relative to the barrel from a distal extended position to a proximal retracted position in which the needle extends a syringe for performing a medical operation and the retaining cylindrical wall of the lock handle receives and holds the syringe through an opening while the latch member is inserted into the hub through a through opening of the syringe wall In the locking recess, in the retracted position, the needle is completely retracted inside the barrel and the locking projection of the barrel is engaged in the locking recess of the hub.
A butterfly needle that includes:

Needle

a needle hub, the needle hub including a locking groove formed on an outer circumferential surface thereof, wherein the needle is coupled to a distal end of the needle hub;

a syringe having a longitudinal axis, the syringe comprising:

a cylinder wall defining the shape of the syringe,

a through opening formed at a distal side of the barrel and penetrating the barrel wall

a through groove formed through the wall of the syringe on a proximal side of the barrel, extending along a longitudinal axis of the barrel and opening at a proximal end, and

a locking projection formed on at least a section of the cylinder wall separated by the through groove and extending toward an inside of the barrel, the locking projection being engageable at the needle seat Locking groove;

a latching member capable of being inserted into the locking recess of the hub through the through opening of the barrel and capable of being separated from the locking recess of the hub;

a butterfly wing mountable on the barrel, the butterfly wing including a cylindrical mounting portion for mounting on an outer circumferential surface of the barrel, the latch member being formed in the cylindrical mounting by an elastic connecting member On the end face of the part;

a lock handle including a handle portion operable by hand and a cylindrical sliding portion mounted on the cylinder wall and slidable along the cylinder wall, the sliding portion including being formed in the a pressing groove on a portion of the sliding portion facing the wall of the barrel,

Wherein the needle hub is disposed within the barrel and is moveable relative to the barrel from a distal extended position to a proximal retracted position in which the needle extends a syringe for performing a medical operation and the pressing recess of the lock lever is in contact with the latch member and pressing the latch member through the through opening of the syringe into the locking recess of the hub In the groove, in the retracted position, the needle is completely retracted inside the syringe and the locking projection of the barrel is engaged in the locking recess of the hub.