JP2012016367A - Fitting part of multiple needle base - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the fitting part of a multiple needle base not requiring the mutual positional alignment of needle bases when the adjacent needle bases of a multiple needle are fitted, blindly enabling insertional mounting and capable of certainly prescribing revolutionary operation.SOLUTION: In the fitting parts of the adjacent outside and inside bases of the multiple needle, a large number of projections the same in shape are provided to the outer peripheral surface of one base while a large number of grooves the same in shape fitted to the projections are provided to the inner peripheral surface of the other base. The respective projections and grooves are formed as an uneven shape continuing circumferentially over one periphery and the projections are formed into a triangular pyramid shape so that the end parts of them become tapered in the connection direction with the other base while the grooves are formed as long grooves having length in a direction parallel to an axis and formed so as to have a V-shaped cross section.

Description

  The present invention relates to a needle base provided at a proximal end portion of a multiple needle, and more particularly, to a fitting portion provided in a needle base of a multiple needle that is fitted to each other and regulates a rotation operation.

Usually, the needle base provided on the multiple needles such as the inner and outer double needles that are selectively detachably attached is provided with an inner needle (in order to prevent mutual alignment of the cutting edges and misalignment of the needle tube during use). A fitting part that engages with each other is provided on the needle base of the inner needle) and the outer needle (outer needle) (hereinafter referred to as the inner and outer needles). It prevents movement such as movement.
As these conventional fitting means, a notch is provided as an inner / outer needle base fitting recess at the rear end of the outer needle base, while a protrusion is provided as an inner / outer needle base fitting protrusion on the inner needle base, And a meshing latch formed on both the upper surface of the trocar housing (outer cylinder) and the lower side of the fixing assembly (inner needle). The means (patent document 2) etc. which are made to fit by is common.

JP 2005-2111268 A JP-A-2005-103287

  According to the fitting part of the above-described form, the position of the inner and outer needles is fixed by the fitting part, so that it is possible to prevent the positional deviation of the blade edge and the rotation during use. However, for example, even if the inner and outer needles do not need to be aligned, such as double needles in which the inner needle protrudes from the outer needle or needles in which the inner needle has a cone or pyramid shape, Therefore, when inserting the inner and outer needles, it was necessary to fit them while confirming the fitting portion of the needle base.

  Therefore, the present invention eliminates the need for aligning the needle bases when fitting adjacent needle bases of the multiple needles, and allows the needles to be inserted blindly and capable of reliably restricting the rotational movement. It was made into the subject to provide the fitting part of a group.

  The fitting portion of the multiple needle base of the present invention is located at the proximal end portion of the multiple needle and is a fitting portion of the adjacent outer base and the inner base that are fitted to each other to restrict the rotation operation. One of the fitting portions is provided with a plurality of protrusions having the same shape on the outer peripheral surface of the base, and is formed as a concavo-convex shape continuous over one circumference, and the other fitting portion is an inner peripheral surface of the base A plurality of grooves having the same shape that match the protrusions were provided on the surface, and formed as a concavo-convex shape continuous over one circumference.

  The fitting portion formed as a protrusion on the outer peripheral surface preferably has a tapered end at the connection direction with the other base, and the protrusion is formed in a triangular pyramid shape. It is preferable that one apex of the cone is formed in the direction of connection with the other group, and another apex is formed in a direction perpendicular to the axial direction of the group.

  The fitting portion formed as a groove on the inner peripheral surface is formed as a long groove having a length in a direction parallel to the axis, and the end of the groove converges toward the connecting direction with the other base. Preferably, the groove is formed in a tapered shape, and the groove is preferably formed in a V-shaped cross section.

As described above, the outer base and the inner base fitting portion are formed as a continuous concave-convex shape with one protrusion serving as the projection and the other serving as the groove. The rotation of the inner and outer bases can be restricted by the hooking of the groove. In particular, since this is continuously formed over the entire circumference, even if each of the protrusions and grooves are shallowly caught, it is possible to prevent the movable member from moving in the rotational direction by a large number of engaging parts. The rotation can be reliably prevented by increasing. Note that if the number of cuts and protrusions is small as in the conventional fitting means, there is a possibility that reliable rotation prevention strength cannot be obtained unless the unevenness (hook) is formed large.
In addition, since a large number of protrusions and grooves having the same shape are continuously formed on each base, a specific position of the needle base (for example, incision) is set when the inner needle is inserted into the outer needle. There is no need to insert it with the aim of the projection), and the mutual base can be fitted regardless of the position of the inner needle.
At this time, even if the positions of the protrusions and the grooves are displaced, such as when the protrusions of the respective bases collide at the initial stage of insertion, they are slightly shifted (rotated) when they are caught. As a result, the projection is guided into the groove and can be easily fitted.

  In addition, by forming the protrusion formed on the outer peripheral surface of the base in a tapered shape in the connecting direction with the other base, the insertion at the lumen entrance to the other base becomes easy, and the protrusion has a triangular pyramid shape. Formed so that one apex is oriented in the direction of connection with the other base and another apex is oriented in a direction perpendicular to the axial direction of the base. The vertical direction is tapered, and the two surfaces (surfaces inside the ridge line connecting the three vertices of the triangular pyramid) that are oriented in the direction of connection with the other base are also formed in a tapered shape, so that the projection is not easily caught. Since it is easy to be introduced into the groove so as to slide in, smooth insertion into the groove becomes possible.

  Furthermore, by forming the groove formed on the inner peripheral surface of the base as a long groove, the projection is positioned so as to be able to move back and forth within the long groove, and the fitting does not come off due to the movement of the front and rear needles. Secure fitting is possible. In addition, when the end of the groove is formed in a tapered shape that converges in the direction of connection with another base, even when the protrusion of the triangular pyramid or the like is inserted, Insertion can be made smooth by being guided into the groove so that the apex slides along the inclination of the groove. In addition, when the cross section is V-shaped, it can be shaped to fit the triangular pyramid of the protrusion, which has a large sliding effect.

  According to the fitting portion of the multiple needle base of the present invention, it is not necessary to align the needle bases when fitting the adjacent needle bases of the multiple needle, which is the subject of the invention, by the above means and function. To provide a multi-needle fitting portion that can be inserted blindly at any position and can be inserted in a blind manner and that can reliably regulate the rotation operation. Can do.

The trocar provided with the needle base of an embodiment of the invention. The outer cylinder base of the embodiment. The inner needle base of the embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 shows an outer cylinder base that is a fitting portion of a multiple needle base according to an embodiment of the present invention, a trocar for endoscopic surgery using an inner needle base, A is an outer cylinder, and B is an outer cylinder. The inner needle, C shows a configuration diagram when the inner and outer needles are fitted. For easy understanding, a part of the inner needle base is shown as a diagram showing the inner surface structure.
The trocar shown in this example is mainly penetrated from the body surface into the body cavity and penetrated into the body wall during the endoscopic surgical operation, and the endoscope and the surgical treatment instrument are passed through the lumen of the outer tube 2. An instrument that is used as a passage for a treatment instrument or the like to be inserted and operated, and is composed of a double needle of an outer cylinder (Fig. A) and an inner needle (Fig. B), and connects the inner and outer needles when penetrating into a body cavity. When the treatment instrument or the like is inserted, the inner needle is removed, and the lumen of the outer tube 2 is used as a passage to the body cavity as described above.

The outer cylinder of this example is provided at an outer cylindrical tube 2 that is a penetration portion into a body cavity, a proximal end portion of the outer cylindrical tube 2, a fitting portion with an inner needle base described later, and an outer cylinder An airtight valve, which is provided in an outer cylinder base 1 serving as a gripping part and an accommodating part provided inside the outer cylinder tube 2 and holds airtightness of a pneumoperitoneum gas in a body cavity by enclosing a treatment instrument for surgery. And 3.
In this example, the outer tube 2 is made of a hard resin, and a cutting edge 21 that is cut obliquely and takes a chamfered shape is formed at the distal end in consideration of puncture into the body cavity. The outer cylinder base connecting portion 22 forming a part of the needle base which becomes a connecting portion with the outer cylinder base 1 described later, and the pneumothorax gas protruding from the side surface of the outer cylinder tube 2 through the lumen A female taper portion 23 is provided which is fitted and connected to a stopcock or the like serving as an inlet / outlet by a general luer taper. Further, at the intermediate portion of the outer cylindrical tube 2, in order to prevent the outer cylindrical tube 2 from slipping out of the body wall when the outer cylindrical tube 2 is drilled in the body wall, a spiral protrusion is formed. Each of the constituent parts was integrally formed by being provided with a drop prevention means 24 formed as a continuous body.
The outer cylinder base 1 is made of a hard resin similar to the outer cylinder tube 2 in this example, has a penetrating lumen, is formed as a generally cylindrical continuous body having a different diameter depending on the part, A space (not shown) in which the airtight valve 3 is provided inside is connected to the outer cylinder base connection portion 22 of the outer cylinder tube 2 to form an outer cylinder gripping portion 43 that becomes a gripping portion of the outer cylinder, On the other hand, the rear end side is formed with a plurality of projections 12 of a triangular pyramid having the same shape as a fitting portion with the inner needle base 4 as a continuous concavo-convex portion 11 around the outer periphery of the end portion. Is formed so as to be tapered 13 toward the end side (direction of connection with the inner needle base 4). In addition, the intermediate part has a cylindrical shape smaller in diameter than the outer cylinder gripping part 43 on the front end side and the continuous uneven part 11 on the rear end side in consideration of the insertion of the inner needle and the treatment instrument, the holding of the airtight valve 3 and the like. Formed.
And the base side connection part 22 of the said outer cylinder pipe 2 and the outer cylinder holding | grip part 43 of the outer cylinder base 1 were connected, and the said airtight valve 3 was clamped by both, and it was set as the outer cylinder of this example.

The inner needle of this example is provided with a cutting edge 521 serving as a distal end for penetrating into a body cavity, and when inserted into the outer cylindrical tube 2, the inner needle tube 5 is formed to have a length protruding from the outer cylindrical tube 2. And an inner needle base 4 which is provided at a proximal end portion of the inner needle tube 5 and serves as a fitting portion with the outer cylinder base 1 and a gripping portion of the inner needle.
In this example, the inner needle tube 5 is formed by connecting a distal tip 52 made of resin, which has a cutting edge 521 for penetrating into a body cavity, to the distal end portion of an inner needle tube main body 51 made of a metal pipe.
In this example, the inner needle base 4 is made of a soft resin compared to the outer cylinder base 1 and the like, the front end portion is opened, the rear end portion is converged into a hemisphere, and the diameter is slightly reduced to the rear end side. A cylindrical space, a lumen space for accommodating the fitting portion of the outer cylinder base 1, and a connection portion with the inner needle tube 5 at the central shaft portion, and the fitting with the outer cylinder base 1 The portion is continuous with a plurality of V-shaped long grooves 42 of the same shape and having a length in the axial direction, which fits the protrusion 12 of the outer cylinder base 1 over the circumference of the inner peripheral surface serving as the lumen space. The concavo-convex portion 41 was formed.
The inner needle base 4 is provided with an inner needle tube connecting portion 43 protruding from the distal end side of the inner needle base 4 on the central axis. In this example, the inner needle tube 5 is fitted and connected by caulking. Thus, the inner needle of this example was obtained.

The outer cylinder and the inner needle formed as described above are inserted into the lumen of the outer cylinder tube 2 by sliding the inner needle tube 4 so that each of the outer cylinder base 1 and the inner needle base 4 has continuous concavo-convex portions. 11 and 41 are matched and inserted to and inserted into the inner needle base fastening portion 14 of the outer cylinder base 1 to be fitted and integrated.
Since the inner needle tube 5 protrudes from the outer tube 2 at the time of fitting, it is necessary to align the cutting edges of the outer tube 2 and the inner needle tube 5 because of the fitting by the continuous concavo-convex portion having the above-described configuration. Absent. Further, the rotation is restricted by the fitting, and at the same time, the fitting of the inner and outer needles by the airtight valve 3 can prevent the inner and outer needles from shifting in the front-rear direction.

FIG. 2 shows an enlarged view of a continuous concavo-convex portion in which A is a front view and a right side view, and B is a fitting portion in the outer cylinder base of the present embodiment.
As described above, the outer cylinder base 1 of the present embodiment has an outer cylinder gripping portion 43 provided with a space (not shown) in which the airtight valve 3 is provided on the front end side, and an inner needle base 4 on the rear end side. A continuous concavo-convex portion 11 provided with a large number of triangular pyramid projections 12 having the same shape as a fitting portion is formed.
Hereinafter, the fitting part which is the main part of the present invention will be described in more detail. The fitting part is formed in the same shape on the outer peripheral surface of the rear end portion of the outer cylinder base 1 over the circumference in the circumferential direction. One apex 121 is directed in the direction of connection with the inner needle base 4 (rear end side), another apex 122 is directed in a direction perpendicular to the axial direction of the base (outward side), and the remaining two apexes The protrusions 12 having a triangular pyramid shape formed along the circumferential direction are continuously arranged without a gap to form a continuous uneven portion 11 to be a fitting portion of the outer cylinder base 1. By making the projections 12 into triangular pyramids arranged as described above, the ridge line connecting the apex 121 toward the rear end side and the apex 122 toward the outer side is inclined, and this is formed around the circumference in the circumferential direction. By forming, the taper 13 which reduces a diameter toward the outer cylinder base rear end side from the outer side vertex 122 as a whole is formed. In addition, each chamfer is chamfered so that each apex 121, 122, the ridge line connecting the apexes, and the recess between the adjacent protrusions 12 can be smoothly inserted without being caught in the fitting with the inner needle base 4. Applied.
Although the size of the triangular pyramid projection 12 to be formed is not specified, it is preferable that each height is formed small for smooth fitting with the inner needle base 4. , The height from the base to the outer apex 122 is 0.45 mm with respect to the base of the cylindrical outer peripheral surface having a diameter of 16.4 mm and a width of 1.7 mm, and the circumferential width direction (for example, outward) The projection was formed by arranging 36 protrusions around one side with the angle of the outer side vertex 122) adjacent to the side vertex 122 being 10 degrees wide.

FIG. 3 shows an inner needle base of the present embodiment, in which A is a front view (partial sectional view) and a left side view, and B is a DD sectional view.
As described above, the inner needle base 4 of the present embodiment includes a lumen space that accommodates the fitting portion of the outer cylinder base 1 and a connection portion with the inner needle tube 5, and the inner portion of the lumen space is used as the fitting portion. A continuous concavo-convex portion 41 provided with a number of V-shaped long grooves 42 of the same shape that fits the projection 12 of the outer cylinder base 1 is formed around the circumference.
Hereinafter, the fitting part which is the main part of the present invention will be described in more detail. The fitting part accommodates the fitting part of the outer cylinder base 1, so that the lumen formed on the distal end side of the inner needle base 4 On the inner circumferential surface of the space, there is provided a long groove 42 of the same shape having a length in the axial direction and having a V-shaped cross section over the circumference in the circumferential direction, and in the long groove in the distal direction of the inner needle base 4 A tapered portion 422 that converges the width of the groove toward the groove, and a straight portion 421 that communicates with the tapered portion 422 to make the width of the groove constant. 41 was formed as a fitting portion of the inner needle base 4. In addition, the bottom of the V-shaped groove 42, the convex part between the adjacent grooves 42, and the edge of the groove are rounded so that they are smoothly inserted without being caught during the fitting with the outer cylinder base 1. Applied.
The size of the V-shaped groove 42 to be formed is not particularly specified, but it is naturally formed in a size that fits the protrusion 12 of the outer cylinder base 1. The depth from the base to the bottom of the groove 42 of the straight portion 421 is 0.45 mm with respect to the base of the inner peripheral surface of 0.7 mm, DD cross-section inner diameter 16.5 mm, and the tapered portion 422 is the inner needle base. The width was 4 mm from the tip, and the angle in the circumferential width direction (for example, from the bottom of the groove 42 to the bottom of the adjacent groove 42) was 10 degrees, and 36 grooves were arranged around the circumference.

The outer cylinder base 1 and the inner needle base 4 formed as described above are fitted by the continuous concavo-convex portions 11 and 41, respectively.
1. When the inner needle base 4 is inserted into the outer cylinder base 1, the protrusion 21 and the groove 42 have the same shape and size that fit each other.
2. Both the protrusion 12 and the groove 42 have a fine width in the circumferential direction at intervals of 10 degrees, and the height of the protrusion (0.45 mm) and the depth of the groove (0.45 mm) are one. One is to be set small.
3. The protrusion 12 has taken a taper shape toward the connection part end with the inner needle base 4.
4). The tip side of the V-shaped groove 42 has a tapered shape that converges toward the tip.
5. Each vertex of the triangular pyramid of the protrusion 12, the ridge line, and the corners of the bottom, convex, and edge of the groove are rounded.
Thus, in an instrument that does not require alignment of the outer cylinder and the inner needle in the direction of the cutting edge, it can be fitted in any position blindly. In addition, no matter what position is inserted, the projections forming the triangular pyramid with the above-described shape can be fitted to the V-shaped groove without feeling any catch in most cases, Even when a slight catch is felt (for example, when the projections and projections of each concavo-convex portion hit from the front), the position of the projection 12 is shifted by a slight rotation or the like, and the projection 12 is inserted into the V-shaped groove 42. Can be guided to.
Further, in this example, the inner needle base 4 is formed in a shape that decreases in diameter from the front end side toward the rear end side by a one degree inclination. According to this configuration, the outer cylinder base 1 to the inner needle base 4 is formed. At the beginning of insertion, there is a relatively large gap at the inlet of the inner needle base 4 so that insertion is easy, and the outer diameter (gap) of the inner and outer bases gradually narrows as it is inserted into the long groove 42 of the inner needle base 4. Thus, the fitting can be ensured.

1. Outer cylinder base 11. Continuous uneven part (fitting part)
12 Protrusion 121. Vertex (base end side)
122. Vertex (outside)
13. Taper 14. Inner needle base part 1. Outer tube 21. Cutting edge 22. Outer cylinder base connection part 23. Female taper part 24. 3. Preventing means Airtight valve 4. Inner needle base 41. Continuous uneven part (fitting part)
42. Groove (V-shaped groove)
421. Straight part 422. Tapered part 43. Inner needle tube connection part 5. Inner needle tube 51. Inner needle main body 52. Tip tip 521. Cutting edge

Claims (5)

  An adjacent outer base that is positioned at the base end portion of the multiple needle and that engages with each other to restrict rotational movement, and an inner base fitting portion, and one of the fitting portions is A large number of protrusions of the same shape are provided on the outer peripheral surface and formed as a concavo-convex shape continuous over one circumference in the circumferential direction, and the other fitting portion is a plurality of grooves of the same shape that fit the protrusions on the inner peripheral surface of the base And a multi-needle base fitting portion characterized by being formed as a concavo-convex shape continuous over one circumference in the circumferential direction.   2. The multiple needle base fitting portion according to claim 1, wherein the fitting portion formed as a protrusion on the outer peripheral surface has an end portion formed in a taper shape in a connecting direction with the other base.   The protrusion is formed in a triangular pyramid shape, wherein one vertex of the triangular pyramid is directed in a connection direction with the other base, and another vertex is formed in a direction perpendicular to the axial direction of the base. The fitting part of 1 or 2 multiple needle bases.   The groove formed on the inner peripheral surface is formed as a long groove having a length in a direction parallel to the axis, and is formed in a tapered shape in which the end of the groove converges in the direction of connection with the other base. The fitting part of the multiple needle base according to claim 1 to 3.   5. The multiple needle base fitting portion according to claim 1, wherein the groove has a V-shaped cross section.

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