JP2023019160A - Puncture device - Google Patents

Abstract

To provide a puncture device which can prevent a housing from being unintentionally detached from a base part when a connecting port receives external force in an extraction direction of a cannula.SOLUTION: A puncture device comprises: a base part which is arranged on a living body surface; a cannula 5 which is inserted into the living body; and a housing 6 which is continuous to a base end of the cannula and can be attached to the base part by rotating on one side in the peripheral direction to the attachment position from the non-attachment position around the cannula. The housing comprises: a connecting port 6a which protrudes in the direction not in parallel to the cannula; and a locking object part 6r which is located in the insertion direction of the cannula when viewed from the connecting port, and is locked to the base part so as to be able to regulate the relative movement in the extraction direction of the connecting port with respect to the base part at the attachment position.SELECTED DRAWING: Figure 6

Description

The present disclosure relates to lancing devices.

It has a base to be placed on the surface of the living body, a cannula to be inserted into the living body, and a housing connected to the proximal end of the cannula and attachable to the base along with the cannula, the housing protruding in a direction not parallel to the cannula. A puncture device having a connection port is known (see Patent Document 1, for example).

WO2008/078318

In a puncture device such as that described in Patent Document 1, after the cannula is inserted into the living body, the connection port may receive an external force in the withdrawal direction of the cannula.

Accordingly, an object of the present disclosure is to provide a puncture device capable of suppressing unintentional detachment of the housing from the base when the connection port receives an external force in the cannula withdrawal direction.

A puncture device according to one aspect of the present disclosure includes a base portion arranged on the surface of a living body, a cannula inserted into the living body, and a base end of the cannula that extends from a non-attached position to an attached position around the cannula. a housing that can be attached to the base by rotating to one side in the circumferential direction, the housing protruding in a direction not parallel to the cannula; and a latched portion capable of restricting movement of the connection port relative to the base portion in the withdrawal direction of the cannula at the mounting position by being latched to the base portion. is.

As an embodiment of the present disclosure, in the puncture device having the above configuration, the locking portion that locks the locked portion is positioned between the connection port and the locked portion in the direction along the cannula. It is a lancing device that

As an embodiment of the present disclosure, in the puncture device having the configuration described above, the locked portion is supported at least by a radially inner edge centered on the cannula, and is supported by the circumferential one side edge. The lancing device has a latched piece that is not supported at the radially outer edge.

As an embodiment of the present disclosure, in the puncture device having the configuration described above, the locking portion is supported by the edge on the one circumferential side and the edge on the radially outer side and is supported by the edge on the other side in the circumferential direction. The lancing device has an edge and a locking piece that is not supported at the radially inner edge.

As an embodiment of the present disclosure, in the puncture device having the above configuration, the base portion is cantilevered and extends in the circumferential direction of the cannula, and the free end portion includes an elastic piece that locks the housing at the mounting position. It is a puncture device having.

Advantageous Effects of Invention According to the present disclosure, it is possible to provide a puncture device capable of suppressing unintentional detachment of the housing from the base due to the connection port receiving an external force in the cannula withdrawal direction.

1 is a perspective view showing a base of a lancing device according to one embodiment; FIG. FIG. 2 is a perspective view showing the base from a different angle than in FIG. 1; 2 is a perspective view of a cannula housing attached to the base shown in FIG. 1; FIG. 4 is a cross-sectional view showing a state before the cannula shown in FIG. 3 is punctured; FIG. FIG. 5 is a cross-sectional view showing a state when puncturing is completed from the state shown in FIG. 4; FIG. 6 is a cross-sectional view showing a state when the mounting of the housing to the base is completed from the state shown in FIG. 5 and the operation member is removed from the base; FIG. 7 is a perspective view showing the state shown in FIG. 6;

Hereinafter, embodiments of the present disclosure will be illustrated in detail with reference to the drawings.

As shown in FIGS. 1 to 7, a puncture device 1 (see FIGS. 4 and 5) according to an embodiment of the present disclosure includes a base 2 (see FIGS. 1 and 2, etc.), a cannula housing 3 (FIG. 3, etc.). ) and an operating member 4 (see FIGS. 4 and 5). As shown in FIG. 3, the cannula housing 3 has a cannula 5 and a housing 6 connected to the proximal end of the cannula 5 . As shown in FIG. 4 , the operating member 4 has an outer case 7 , an inner case 8 , a biasing member 9 and a holding member 10 , and the holding member 10 has a body portion 11 , a grip portion 12 and an inner needle 13 .

The housing 6 extends from the non-mounting position shown in FIG. 4 to the mounting position shown in FIGS. It can be attached to the base 2 by rotating clockwise) by an angle α (see FIG. 7). Further, the housing 6 has a connection port 6a projecting in a direction not parallel to the cannula 5 (a direction along a straight line perpendicular to the rotation axis O in this embodiment).

In the present embodiment, for convenience of explanation, the direction along the rotation axis O (the vertical direction in FIGS. 4 to 6) is also referred to as the vertical direction, and the direction along the straight line perpendicular to the rotation axis O is also referred to as the radial direction. The direction around the rotation axis O is also referred to as the circumferential direction. Regarding the cannula housing 3, the direction in which the connection port 6a protrudes when the attachment is completed (the right direction in FIG. 6) is the front, the opposite direction is the rear, the vertical direction and the front-back direction. The direction perpendicular to both is also referred to as the left-right direction. Regarding the base 2, the direction in which the connection port 6a protrudes at the mounting position (right direction in FIGS. 4 to 6) is the front, the opposite direction is the rear, the vertical direction and the front and back. The direction perpendicular to both directions is also called the left-right direction.

As shown in FIGS. 3 and 6, the housing 6 has a top wall 6b, a peripheral wall 6c, and a cylindrical connection port 6a projecting forward from the bottom wall 6d. More specifically, the connection port 6a has a tubular shape centered on an axis orthogonal to the rotation axis O. As shown in FIG. The connection port 6a is composed of a cylindrical port body 6e projecting forward from the peripheral wall 6c and a cap member 6f covering the port body 6e from the front. The housing 6 has an internal channel 6g that allows the lumen of the connection port 6a and the lumen of the cannula 5 to communicate with each other. Further, the housing 6 has a restricting protrusion 6h protruding radially outward from the peripheral wall 6c. The housing 6 includes an upper member 6i having a top wall 6b and an upper portion of the outer periphery of the peripheral wall 6c, a lower member 6j having a remaining portion of the peripheral wall 6c, a bottom wall 6d and a port body 6e, and a cap member 6f. , consists of The upper member 6i and the lower member 6j are connected to each other through a hinge portion and assembled together by hinge operation. The cap member 6f is provided separately from the upper member 6i and the lower member 6j and assembled to the port body 6e. The upper member 6i and the lower member 6j may be provided separately. The upper member 6i, the lower member 6j and the cap member 6f are each made of synthetic resin, for example.

The connection port 6a can be connected to the connector portion 14a of the pump device 14 (see FIG. 6). The connector portion 14a is connected to the connection port 6a by inserting the connector portion 14a backward into the connection port 6a as indicated by the two-dot chain line arrow in FIG. By operating the pump device 14, a predetermined fluid such as a drug solution such as insulin can be sent into the lumen of the connection port 6a at an appropriate flow rate, and can be supplied into the living body through the internal flow path 6g and the lumen of the cannula 5. .

The cannula housing 3 closes the connection port 6a when the connector portion 14a is disconnected. Further, the cannula housing 3 has a valve member 15 inside the connection port 6a that communicates the lumen of the connector portion 14a with the lumen of the connection port 6a when the connector portion 14a is connected. The valve member 15 is composed of an O-ring 15a, a spring body 15b and a valve body 15c. The spring body 15b is composed of a compression spring that can extend and contract in the front-rear direction. The spring body 15b is provided integrally with the valve body 15c in this embodiment, but may be provided separately. The forward movement of the valve body 15c is restricted by the O-ring 15a, and the rearward movement thereof is restricted by the spring body 15b. The spring body 15b can bias the valve body 15c forward. The inner diameter of the port body 6e is larger than the outer diameter of the valve body 15c, thereby forming a gap serving as a flow path between the inner surface of the port body 6e and the valve body 15c.

The ceiling wall 6b has a through hole 6k centered on the rotation axis O. As shown in FIG. The cannula housing 3 also has an elastic valve 16 that blocks communication between the through hole 6k of the top wall 6b and the internal flow path 6g. The elastic valve 16 has a disk shape centered on the rotation axis O, and the inner peripheral surface of the peripheral wall 6c is stepped downward through a stepped surface 6l that is annular when viewed from above. The outer peripheral portion is sandwiched between the step surface 6l and the lower surface of the ceiling wall 6b. As shown in FIGS. 4 and 5, the inner needle 13 can pierce the elastic valve 16 . Therefore, by lowering the inner needle 13 with respect to the cannula housing 3 in a state where it extends along the rotation axis O with its sharp tip facing downward, the tip of the inner needle 13 is moved to the through hole 6k, After passing through the elastic valve 16 and the lumen of the cannula 5 in this order, it can be made to protrude from the tip of the cannula 5 . Further, by removing the inner needle 13 from the elastic valve 16, the elastic valve 16 can be restored to its original shape, and the communication between the through hole 6k of the ceiling wall 6b and the internal flow path 6g can be cut off.

The bottom wall 6d has a through hole 6m with a downward conical portion of reduced diameter centered on the axis O of rotation. The inner peripheral surface of the peripheral wall 6c is stepped upward from the upper end of the diameter-reduced portion of the through hole 6m via a stepped portion 6n that is annular in bottom view. The cannula housing 3 also includes a mounting member 17 having a downwardly conical upper tapered tube 17a centered on the rotational axis O and a lower tube 17b extending downward from the lower end of the upper tapered tube 17a and centered on the rotational axis O. have The cannula 5 has a downwardly conical tapered tubular portion 5a centered on the rotational axis O, and a hollow needle-shaped cannula body 5b extending downward from the lower end of the tapered tubular portion 5a and centered on the rotational axis O. The upper end of the upper tapered tube 17a of the mounting member 17 is fitted into the stepped portion 6n, thereby holding the tapered tube portion 5a of the cannula 5 between the lower surface of the upper tapered tube 17a and the upper surface of the reduced diameter portion of the through hole 6m. , so that the cannula 5 is fixed to the housing 6 . The cannula 5 and the mounting member 17 may be fixed to the bottom wall 6d by welding or the like. The cannula 5 and the mounting member 17 are each made of metal or synthetic resin, for example.

As shown in FIG. 3 , the outer peripheral surface of the peripheral wall 6 c has a grip recess 6 o that is gripped by the grip portion 12 of the holding member 10 . At least two pairs of gripping portions 12 and gripping recesses 6o are provided. The two gripping recesses 6o are provided at positions opposite to each other with respect to the rotation axis O. More specifically, the two gripping recesses 6o are inclined to one side in the circumferential direction by an angle α with respect to the horizontal direction when viewed from above. are arranged side by side.

As shown in FIGS. 3 and 7, the outer peripheral surface of the peripheral wall 6c has fitting protrusions 6p that are engaged with the elastic pieces 2f of the base 2 by fitting. The fitting protrusions 6p are provided at positions opposite to each other with respect to the rotation axis O. More specifically, the fitting protrusions 6p do not overlap the connection port 6a, the restricting projection 6h, and the gripping recess 6o when viewed from above. position. At least two pairs of elastic pieces 2f and fitting protrusions 6p are provided.

As shown in FIGS. 1-2, the base 2 has a bottom plate 2a, a rear peripheral wall 2b and two side peripheral walls 2c. The bottom plate 2a is placed on the living body surface (not shown). More specifically, the bottom plate 2a has a flat plate shape that conforms to the surface of the living body, and the lower surface of the bottom plate 2a is attached to the surface of the living body via an adhesive member such as double-sided adhesive tape. The base 2 is made of synthetic resin, for example.

The bottom plate 2a has a circular central hole 2d centered on the rotation axis O when viewed from above. The base portion 2 also has a positioning protrusion 2e that protrudes upward from the outer peripheral edge of the center hole 2d and has an annular shape centered on the rotation axis O. As shown in FIG. As shown in FIG. 6, the lower surface of the housing 6 is provided with a circular positioning recess 6q centered on the rotation axis O when viewed from the bottom. By inserting the positioning projection 2e into the positioning recess 6q, the rotation axis O of the cannula housing 3 is aligned with the rotation axis O of the base 2. As shown in FIG.

As shown in FIGS. 1, 2 and 7, the base portion 2 is cantilevered on the upper surface of the bottom plate 2a radially outwardly of the positioning projections 2e and extends in the circumferential direction. It has two elastic pieces 2f for locking the housing 6 in the . More specifically, each elastic piece 2f has a free end on one side in the circumferential direction. Each free end has a circumferential fitting portion 2g that locks the fitting projection 6p (see FIG. 3) so as to restrict movement of the fitting projection 6p (see FIG. 3) to the other side in the circumferential direction. Further, each free end has a vertical fitting portion 2h that locks the fitting projection 6p so as to restrict upward movement of the fitting projection 6p. When the housing 6 rotates to one side in the circumferential direction from the non-attached position to the attached position, each elastic piece 2f is elastically deformed radially outward, so that each circumferential fitting portion 2g engages the fitting convex portion 6p. It can be climbed over and locked.

The base 2 also has a contact projection 2i extending upward from the bottom plate 2a behind the positioning projection 2e. When the housing 6 rotates from the non-attached position to the attached position in one circumferential direction, the restricting protrusions 6h of the housing 6 come into contact with the contact protrusions 2i from the other circumferential side, thereby restricting further rotation of the housing 6. be able to.

As shown in FIGS. 1 and 2, the base 2 has an insertion hole 2j extending vertically through the bottom plate 2a in front of the positioning protrusion 2e. The insertion hole 2j has a fan shape centered on the rotation axis O in a plan view. In addition, the base 2 includes an eave-like locking piece 2k that covers the insertion hole 2j from above at a corner formed by the radially outer edge of the insertion hole 2j and the one circumferential edge. have a part. More specifically, the locking piece 2k is provided so as to be supported by the one circumferential side edge and the radially outer edge and not to be supported by the circumferentially other side edge and the radially inner edge. be done. That is, the locking piece 2k is connected to the bottom plate 2a only at the one circumferential edge and the radially outer edge.

As shown in FIGS. 3 and 6, the housing 6 has an engaging piece 6r. The locked piece 6r is located in the insertion direction (that is, downward) of the cannula 5 when viewed from the connection port 6a. The locked piece 6r is a locked portion on the connection port 6a side at the mounting position. The locked piece 6 r is locked by the locking piece 2 k of the base 2 , thereby making it possible to restrict the relative movement of the housing 6 with respect to the base 2 in the removal direction (that is, upward) of the cannula 5 . Note that "located in the insertion direction (that is, downward) of the cannula 5 when viewed from the connection port 6a" means that the connection port 6a and the engaged portion at least partially overlap when viewed from above.

The engaged piece 6r is supported by the peripheral wall 6c at least at the radially inner edge of the engaged piece 6r, and is provided so as not to be supported at both circumferential ends and the radially outer edge. More specifically, the locked piece 6r continues to the peripheral wall 6c only at the radially inner edge. As shown in FIG. 6, in the attached position, the locking portion is positioned between the connection port 6a and the locked portion in the direction along the cannula 5 (that is, in the vertical direction). Further, the locked piece 6r protrudes radially outward from the port body 6e with a predetermined space therebetween.

The cannula 5 is inserted into the living body by moving the cannula housing 3 straight downward together with the inner needle 13 with respect to the bottom plate 2a without rotating in the circumferential direction. It can be arranged in a non-mounting position where the positioning protrusion 2e is inserted into the positioning recess 6q. Subsequently, the cannula housing 3 is rotated in the circumferential direction parallel to the bottom plate 2a, so that the locked piece 6r enters between the insertion hole 2j and the locking piece 2k.

The puncture operation for inserting the cannula 5 into the living body and the subsequent rotation operation of the cannula housing 3 from the non-attached position to the attached position can be performed easily and reliably by preferably using the operating member 4 .

As shown in FIGS. 4 and 5, the operating member 4 has an outer case 7, an inner case 8, a biasing member 9 and a holding member 10. As shown in FIGS. The outer case 7 has a tubular shape whose diameter expands downward, and is arranged so as to cover the tubular inner case 8 whose diameter expands downward from above. The outer case 7 can rotate about the rotation axis O with respect to the inner case 8 . The rotation axis O of the operating member 4 is arranged to match both the rotation axis O of the cannula housing 3 and the rotation axis O of the base 2 .

As shown in FIGS. 1 and 2, the base 2 has three notches 2l each extending in the circumferential direction radially outward of the two elastic pieces 2f. The radially outer edge of each notch 2l has an eaves portion 2m that protrudes radially inward at a portion other than the end on one side in the circumferential direction. The outer case 7 has three claws 7a at its lower end. As shown in FIG. 5, each claw portion 7a bends downward and then radially outward to form an L shape when viewed from the circumferential direction. The rotation axis O of the operation member 4 is aligned with the rotation axis O of the base 2 by inserting each claw 7a into the end of the corresponding notch 2l on one side in the circumferential direction from above. By twisting the outer case 7 with respect to the base 2, each of the claws 7a is guided by the notch 2l, whereby the outer case 7 can be rotated with respect to the base 2 in the circumferential direction. . In addition, since the tip of each claw portion 7a slips under the eaves portion 2m, upward separation of the operating member 4 from the base portion 2 can be restricted.

As shown in FIG. 1, the base 2 has anti-rotation holes 2n radially inward of the three notches 2l. The inner case 8 has an anti-rotation projection (not shown) inserted into the anti-rotation hole 2n at its lower end. Circumferential rotation of the inner case 8 with respect to the base 2 can be restricted by inserting the anti-rotation protrusion into the anti-rotation hole 2n.

As shown in FIGS. 4 and 5, the holding member 10 has a body portion 11, a grip portion 12 and an inner needle 13. As shown in FIGS. The body portion 11 has a guided portion 11a that is inserted into a hole portion 7b provided in the top portion of the outer case 7 and extending in the vertical direction. The guided portion 11a has a rod shape extending in the vertical direction, and an engaging portion 11b wider than the guided portion 11a continues to the lower end of the guided portion 11a. A biasing member 9 is arranged between the upper surface of the engaging portion 11 b and the lower surface of the top portion of the inner case 8 . The biasing member 9 is composed of a compression spring that can extend and contract in the vertical direction. The inner needle 13 is arranged along the rotation axis O and is integrally attached to the body portion 11 .

The gripping portion 12 includes two telescoping arm portions 12a aligned in the left-right direction and two gripping pieces 12b aligned in the left-right direction. 11 and cannula portion 6 are shown), a pressing plate portion 12c and two engaging pieces 12d arranged in the front-rear direction. Each extensible arm portion 12a has a lateral V shape that bulges outward in the radial direction when viewed in the front-rear direction. can. Each gripping piece 12b extends downward from the lower portion of the corresponding telescopic arm portion 12a. Also, the lower end of each gripping piece 12b is inserted into the corresponding gripping recess 6o so that the housing 6 can be gripped. The lower portion of each telescopic arm portion 12a is connected to the pressing plate portion 12c. A lower end portion of each engaging piece 12d is connected to the pressing plate portion 12c via a hinge portion so as to be swingable about an axis extending in the left-right direction.

4 shows the state before the outer case 7 rotates to the other side in the circumferential direction with respect to the inner case 8 by an angle β (see FIG. 1) which is larger than the angle α. In the pre-puncture state shown in FIG. 4, the guided portion 11a is engaged with the hole portion 7b so as to be restricted from moving downward while the biasing member 9 is compressed (this engagement mechanism is , due to the engagement of uneven shapes (not shown). In addition, in the state before puncture, each extendable arm portion 12a contracts in the vertical direction, and the upper portion of each engaging piece 12d is engaged with the engaging portion 11b at the radially inner portion so as to be restricted from moving downward. The inner needle 13 is inserted into the cannula 5, and the upper surface of the housing 6 is pressed against the pressure plate. The two gripping pieces 12b are inserted into the two gripping recesses 6o to grip the housing 6 while coming into contact with the lower surface of the portion 12c.

By rotating the outer case 7 toward the other side in the circumferential direction by an angle β with respect to the inner case 8 from the pre-puncture state, the locking of the hole portion 7b that restricts the downward movement of the guided portion 11a is released. . As a result, the holding portion is pushed down together with the cannula housing 3 by the biasing force of the biasing member 9, and the inner needle 13 and the cannula 5 can be punctured into the surface of the living body as shown in FIG. Since the inner peripheral surface of the inner case 8 gradually expands in diameter downward, in this puncture state, the upper portion of each engaging piece 12d is positioned from the inner peripheral surface of the inner case 8 at the radially outer portion. By separating, the rocking|fluctuation to the radial direction outer side is permitted, and the latching to the engaging part 11b is cancelled|released. Further, in this puncture state, the retractable arm portions 12a are maintained in a vertically contracted state by the biasing force of the biasing member 9, so that the gripping of the housing 6 by the two gripping pieces 12b is maintained.

From the puncture state, the outer case 7 is rotated to one side in the circumferential direction by an angle β with respect to the inner case 8, so that the guided portion 11a is circumferentially engaged with the hole portion 7b from the middle of the rotation by the engagement of the concave and convex shapes (not shown). direction, whereby the holding portion can be rotated to one side in the circumferential direction together with the outer case 7 by the angle α. At this time, each of the gripping pieces 12b can press the end wall of the gripping recess 6o on one side in the circumferential direction, so that the housing 6 can be rotated from the non-mounting position to the mounting position. Also, this rotation allows the locked piece 6r to slip under the locking piece 2k. By removing the claw portions 7a of the outer case 7 from the corresponding notch portions 2l, the telescopic arm portions 12a extend vertically, and in conjunction with this, the gripping pieces 12b extend radially outward. swing so that it is open to Thereby, the grip on the housing 6 is released. Thus, the operating member 4 can be removed from the base 2 while leaving the cannula housing 3 in the base 2, as shown in FIGS.

After the cannula housing 3 is attached to the base 2, the pump device 14 can be attached to the base 2 and used. Before the pump device 14 is attached to the base 2 or when the pump device 14 is removed from the base 2, the connection port 6a may be unintentionally caught on something (for example, clothes, straps, etc.). There is a possibility that the housing 6 may unintentionally separate from the base 2 when the external force is applied to the cannula 5 in the withdrawal direction of the cannula 5 . However, in the present embodiment, the connection port 6a at the mounting position is locked by the base portion 2 so that the relative movement of the connection port 6a in the withdrawal direction of the cannula 5 relative to the base portion 2 can be restricted by the housing 6. have. The locked portion is provided at a position in the insertion direction of the cannula 5 when viewed from the connection port 6a. As a result, it is possible to effectively withstand the external force, thereby suppressing unintended detachment of the housing 6 from the base 2 .

In particular, in this embodiment, in the attached state, the locking portion for locking the locked portion is positioned between the connection port 6a and the locked portion in the direction along the cannula 5, and the locked portion , and has an engaged piece 6r that is supported at least at the radially inner edge centered on the cannula 5 and is not supported at the circumferential one side edge and the radially outer edge, and the locking portion is The base portion 2 has a locking piece 2k that is supported at the one circumferential side edge and the radially outer edge and is not supported at the other circumferential side edge and the radially inner edge. Since the cannula 5 is held and supported and has the elastic piece 2f extending in the circumferential direction of the cannula 5 and locking the housing 6 at the mounting position at the free end, the external force as described above can be more effectively endured.

The present disclosure is not limited to the above-described embodiments, and can be variously modified without departing from the scope of the present disclosure.

Therefore, the puncture device 1 according to the embodiment described above can be modified in various ways, for example, as described below.

The puncture device 1 according to the above-described embodiment includes a base portion 2 arranged on the surface of a living body, a cannula 5 inserted into the living body, a base end of the cannula 5 connected to the base end, and attached from a non-attached position centering on the cannula 5. a housing 6 attachable to the base 2 by rotating one side circumferentially to a position, the housing 6 projecting in a direction not parallel to the cannula 5 and the cannula as viewed from the connecting port 6a; a locked portion located in the insertion direction of the cannula 5 and capable of restricting movement of the connection port 6a relative to the base portion 2 in the withdrawal direction of the cannula 5 at the mounting position by being locked to the base portion 2; Various modifications are possible as long as the puncture device 1 has.

For example, the to-be-latched portion is not limited to the configuration that continues to the peripheral wall 6c, and may be configured to continue to the connection port 6a, for example. A configuration in which the contact projection 2i and the restricting projection 6h are not provided may be employed. The numbers of the elastic pieces 2f and the fitting protrusions 6p may be increased or decreased, or the elastic pieces 2f and the fitting protrusions 6p may not be provided. The connection port 6a may have a tubular shape centered on an axis parallel to an axis intersecting (for example, perpendicular to) the rotation axis O. As shown in FIG. The shapes of the positioning convex portion 2e and the positioning concave portion 6q can be appropriately set. A configuration in which the positioning convex portion 2e and the positioning concave portion 6q are not provided may be adopted.

In the puncture device 1 according to the above-described embodiment, the locking portion that locks the locked portion is positioned between the connection port 6a and the locked portion in the direction along the cannula 5 in the above configuration. 1 is preferred.

In the puncture device 1 according to the above-described embodiment, in the configuration described above, the locked portion is supported at least by the radially inner edge centered on the cannula 5 and is supported by the circumferentially one side edge and the radially outer edge. It is preferable that the puncture device 1 has a piece to be engaged 6r that is not supported at the edge of the.

In the puncture device 1 according to the above-described embodiment, in the configuration described above, the engaging portion is supported by the edge on one side in the circumferential direction and the edge on the radially outer side, and is supported by the edge on the other side in the circumferential direction. Preferably, the lancing device 1 has an unsupported locking piece 2k at the inner edge.

In the puncture device 1 according to the above-described embodiment, the base portion 2 is cantilever-supported and extends in the circumferential direction of the cannula 5, and has an elastic piece 2f that locks the housing 6 at the mounting position at the free end. The puncture device 1 is preferred.

As an example, the puncture device of the embodiment described above was produced, a string was put on the connection port, and the load when the cannula housing was pulled upward until it was removed from the base was measured. As a comparative example, a lancing device having the same configuration as that of the example except that the above-described locked portion and locking portion were not provided was prepared, and the load was measured under the same conditions as the example. A push-pull gauge (Nidec FGP-5 manufactured by Nidec-Shimpo Co., Ltd.) was used to measure the load, and the average value of two measurements was obtained. As a result, it was 3.90 N in the comparative example, while it was 9.50 N in the example, confirming a significant improvement. In addition, in the example, the load was measured when pulled obliquely upward, which is a more severe condition, instead of upward. The result was an average value of 7.41 N for two measurements, confirming that the above-described configuration of providing the locked portion and the locking portion is effective against such an external force obliquely upward and rearward. was done.

1 puncture device 2 base 2a bottom plate 2b rear peripheral wall 2c side peripheral wall 2d center hole 2e positioning convex portion 2f elastic piece 2g circumferential fitting portion 2h vertical fitting portion 2i contact projection 2j insertion hole 2k locking piece (locking part)
2l Notch 2m Eaves 2n Anti-rotation hole 3 Cannula housing 4 Operation member 5 Cannula 5a Taper cylinder 5b Cannula body 6 Housing 6a Connection port 6b Ceiling wall 6c Peripheral wall 6d Bottom wall 6e Port body 6f Cap member 6g Internal flow path 6h Control projection 6i Upper member 6j Lower member 6k Through hole 6l Stepped surface 6m Through hole 6n Stepped portion 6o Grasping recess 6p Fitting protrusion 6q Positioning recess 6r Locked piece (locked portion)
7 Outer case 7a Claw 7b Hole 8 Inner case 9 Biasing member 10 Holding member 11 Main body 11a Guided portion 11b Engaging portion 12 Gripping portion 12a Telescopic arm portion 12b Gripping piece 12c Pressing plate portion 12d Engaging piece 13 Inside Needle 14 Pump device 14a Connector portion 15 Valve member 15a O-ring 15b Spring body 15c Valve body 16 Elastic valve 17 Mounting member 17a Upper tapered tube 17b Lower tube O Rotation axis α, β Angle

Claims (5)

a base disposed on a biological surface;
a cannula inserted in vivo;
a housing connected to the proximal end of the cannula and attachable to the base by rotating in one circumferential direction from the non-attached position to the attached position about the cannula;
said housing has a connection port projecting in a direction non-parallel to said cannula and positioned in a direction of insertion of said cannula as viewed from said connection port, said connection port being in said mounting position in a direction of withdrawal of said cannula relative to said base; a latched portion that can be restricted from moving relative to the base portion by being latched to the base portion. The puncture device according to claim 1, wherein a locking portion that locks the locked portion is positioned between the connection port and the locked portion in the direction along the cannula. The locked portion has a locked piece that is supported at least at a radially inner edge centered on the cannula and is not supported at the circumferential one side edge and the radially outer edge. The lancing device according to claim 2. The locking portion includes a locking piece supported by the one circumferential side edge and the radially outer edge and not supported by the circumferentially other side edge and the radially inner edge. 4. The lancing device of claim 3, comprising: The puncture according to any one of claims 1 to 4, wherein the base is cantilevered and extends in the circumferential direction of the cannula and has an elastic piece that locks the housing at the mounting position at its free end. Device.

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