JP4441251B2 - Replacement gastrostomy catheter and feeding tube - Google Patents

Description

  The present invention relates to a replacement gastrostomy catheter and a feeding tube to be attached to a gastrostoma.

  It is known that for patients who have health problems, etc., and who cannot voluntarily ingest nutrition, they can be ingested using infusion, or fed through the tube from the patient's nose to the digestive tract. It has been. However, nutrition intake by such a method often imposes pain on patients. For this reason, in recent years, there have been cases in which an endoscope is used to construct a fistula (gastric fistula) in the patient's abdomen, a gastrostomy catheter is attached to the fistula, and nutrition is taken through the gastrostomy catheter. It is increasing.

  Gastrostomy catheters used for such applications can be broadly classified into a button type with a short tube through which nutrients flow and a tube type with a long tube depending on the shape outside the abdominal wall. For example, in the case of a button type, it has a catheter main body to which a bumper to be placed in the stomach lumen is attached at the tip of a hollow shaft that penetrates the fistula. Here, since the button-type catheter body has a small amount of protrusion outside the abdominal wall, it can be easily rehabilitated and easily maintained clean, so it is mainly used as a gastrostomy catheter for replacement. (For example, refer nonpatent literature 1).

When nutrient intake is performed using this type of catheter body, a feeding tube connected to a nutrient container is connected to the shaft. As a connection structure between the catheter main body and the feeding tube, there is a structure in which a female screw is provided on the catheter main body side and a male screw is provided on the feeding tube side. In some cases, an engaging piece is provided on the inner peripheral surface of the feeding tube, and the engaging piece is engaged with and disengaged from the catheter body by deforming the feeding tube itself.
“Gastrointestinal Endoscopy Manual for Nurses”, Gakken, August 2003, p. 192-207

However, when connecting the feeding tube while rotating it, such as when using screws for attaching and detaching the feeding tube, there is a problem that the rotating position of the feeding tube has to be adjusted prior to the connection. Further, when the feeding tube itself is deformed, it is difficult to handle the feeding tube while deforming. For this reason, it has been desired that the feeding tube can be easily attached and detached in consideration of home nursing and the like.
Further, when the feeding tube is deformed, when the amount of deformation is not sufficient, the engaging piece may be caught on the catheter body side and worn. Here, when the engaging piece is worn, there is a problem that it is difficult to reliably attach the feeding tube.
The present invention has been made in view of such problems, and an object thereof is to enable a feeding tube to be easily and reliably attached to and detached from a replacement gastrostomy catheter.

The invention according to claim 1 of the invention for solving the above-described problems includes an exchange catheter body to be attached to a fistula formed between the abdominal wall and the stomach wall, and a feeding tube detachably attached to the exchange catheter body. A gastrostomy catheter for replacement, wherein the replacement catheter body has a hollow shaft, and a distal end of the shaft is provided with a stopper having a larger diameter than the shaft; The base end portion is provided with a main body side connecting means made of a cylindrical member, and the main body side connecting means is provided with a substantially annular engaging groove along a circumferential direction thereof. And a tube-side connection means connectable to the body-side connection means at the distal end of the tube body, and the tube-side connection means Substantially perpendicular to detachment direction of the ether body, when a force toward the radially inner side of the feeding tube is applied, it includes an engagement member for releasing the engagement between the engagement groove, the engagement When the engagement between the groove and the engaging member is released by the force, the replacement catheter body and the feeding tube are relatively close to each other or separated by a linear motion in the axial direction of the feeding tube. allow der Rukoto was the replacement gastrostomy catheter characterized.
According to this exchange gastrostomy catheter, the connecting means can be engaged and disengaged by applying a force in a direction substantially perpendicular to the direction in which the feeding tube is attached to and detached from the exchange catheter body. Therefore, when gripping and handling the feeding tube, it becomes possible to engage and disengage at the same time. In particular, since the engagement groove on the replacement catheter body side is provided in a substantially annular shape in the circumferential direction, alignment in the rotational direction is not necessary when the feeding tube is attached.

The invention according to claim 2 is a feeding tube that is detachably attached to a replacement catheter body that is attached to a gastrostomy, and includes a hollow tube body and tube-side connection means fixed to the tube body. The tube side connecting means is provided on the replacement catheter body side when a force is applied that is substantially perpendicular to the attaching / detaching direction to the replacement catheter body and directed radially inward of the feeding tube. An engagement member for releasing the engagement with the engagement groove, and when the engagement between the engagement groove and the engagement member is released by the force, the replacement catheter body and the feeding tube There was a feeding tube, characterized in relatively close to or separable der Rukoto by linear movement in the axial direction of the feeding tube.
The feeding tube is configured so that the engaging member is engaged with and disengaged from the engaging groove when a force is applied in a direction substantially perpendicular to the attaching / detaching direction to the replacement catheter body. For this reason, when gripping and handling the feeding tube, it becomes possible to engage and disengage at the same time.

According to a third aspect of the present invention, in the feeding tube according to the second aspect, the tube side connecting means separates the pair of engaging members disposed opposite to each other and the pair of engaging members from each other. And a biasing member biasing in the direction.
In this feeding tube, the engagement between the engagement member and the engagement groove is released by pushing the pair of engagement members closer to each other. Since such a force also acts as a force for gripping the feeding tube, the feeding tube can be attached and detached in this state.

According to a fourth aspect of the present invention, in the feeding tube according to the second aspect, the tube-side connecting means includes a tubular member, a ring member that covers an outer periphery of the tubular member with a predetermined bending allowance, and the ring. A plurality of engaging members provided on an inner peripheral surface of the member, and the engaging member releases the engagement with the engaging groove when the ring member is bent. .
When this feeding tube is crushed so as to flatten the link member and the engagement member is separated as the ring member is deformed, the engagement with the engagement groove is released. Since such a force also acts as a force for gripping the feeding tube, the feeding tube can be attached and detached in this state.

  According to this invention, when the feeding tube is attached to and detached from the replacement catheter body attached to the gastrostoma, the force on the tube side connecting means is applied when a force is applied in a direction substantially perpendicular to the attaching and detaching direction of the feeding tube. Since the connection is released, the feeding tube can be attached and detached easily and reliably. Moreover, since it is easy to hold | maintain the state by which engagement with the engaging member and the engaging groove was cancelled | released, wear of an engaging member can also be prevented.

The best mode for carrying out the invention will be described in detail with reference to the drawings.
1 and 2 show the configuration of the replacement gastrostomy catheter according to the first embodiment.
As shown in FIGS. 1 and 2, the replacement gastrostomy catheter includes an exchange catheter body 1 and a feeding tube 2.
The replacement catheter body 1 has a hollow shaft 3 penetrating a fistula (gastric fistula) W3 formed between the abdominal wall W1 and the stomach wall W2, and a gastric lumen is formed on the outer peripheral surface of the distal end portion 3a of the shaft 3. A bumper 4 is bonded as a stopper to be placed in the container. Further, a main body side connection means (hereinafter referred to as a first connection means) 5 that functions as an adapter when connected to the feeding tube 2 is attached to the base end portion 3b of the shaft 3 that is detained outside the body. ing.

The shaft 3 has an outer diameter smaller than that of the fistula W3, and nutrients flow through the shaft 3. Moreover, as shown in FIG. 1, the flange 6 is provided in the base end part 3b. The replacement catheter body 1 is fixed by sandwiching the abdominal wall W1 and the stomach wall W2 between the flange 6 and the stopper 4. A cap that fits with the first connecting means 5 and closes the shaft 3 is attached to one end of the flange 4. Further, a backflow prevention valve 7 is provided in the shaft 3 to prevent backflow of nutrients and the like from the stomach lumen.
The bumper 4 has the largest outer diameter in the vicinity of the proximal end bonded to the shaft 3 and is reduced in diameter toward the distal end. The bumper 4 is made of a hollow member, and two holes 4a are formed in the vicinity of the tip. The maximum outer diameter of the bumper 4 is larger than the outer diameter of the shaft 3 and the hole diameter of the fistula W3, and the gastrostomy catheter 1 is prevented from coming out of the fistula W3 during normal use.
The 1st connection means 5 consists of a cylindrical member, and the internal diameter is the same as the internal diameter of the shaft 3, or larger than an internal diameter. Furthermore, an engagement groove 8 is formed in the inner wall of the first connection means 5 in an annular shape along the circumferential direction.

As shown in detail in FIG. 2, the feeding tube 2 has a hollow tube main body 10, and a tube side connection that functions as an adapter at the distal end portion 10 a of the tube main body 10 when connected to the replacement catheter main body 1. Means (hereinafter referred to as second connection means) 11 is attached. Note that a container containing a nutrient, a syringe, and the like are connected to the proximal end (not shown) of the tube body 10.
The second connecting means 11 includes a bottomed cylindrical adapter body 12, a hollow insertion tube 14 that vertically passes through the center of the bottom 13 that closes one opening of the adapter body 12, and an annular side wall of the adapter body 12. 15, two engaging members 16 that penetrate through 15, and a coiled spring 17 that urges the engaging member 16 outward in the radial direction of the adapter main body 12.

  As shown in FIG. 2, the adapter main body 12 is connected to the tube main body 10 via the insertion tube 14. The opening 12a of the adapter main body 12 is arranged downward in FIG. 2, that is, in a direction facing the replacement catheter main body 1. Further, the side wall 15 of the adapter main body 12 has an inner diameter substantially equal to the outer diameter of the first connecting means 5. Furthermore, two through holes 15 a are formed in the side wall 15 at a position where the phase is shifted by about 180 °. The through hole 15a has an axis parallel to the radial direction of the adapter body 12, that is, the direction substantially orthogonal to the axis C1 of the adapter body 12, and the engaging member 16 is slidably inserted into each of the through holes 15a. .

  The engaging member 16 includes a main body portion 21 penetrating the through hole 15a, an engaging protrusion 22 provided on the inner side of the adapter main body 12 of the main body portion 21, and an operation portion 23 provided on the outer side of the adapter main body 12 of the main body portion 21. It consists of. The main body 21 is bent toward the opening 12a on the inner side of the adapter main body 12, and an engagement protrusion 22 projects outward in the radial direction at the tip thereof. That is, the main body 21 and the engaging protrusion 22 have a bowl shape as a whole. Furthermore, the operation part 23 is a part which a nurse etc. press with a finger. For this reason, the operation part 23 has a larger cross-sectional area than the main body part 21 when viewed from the radial direction, and is easy to operate. And between the operation part 23 and the side wall 15 of the adapter main body 12 which opposes this, the spring 17 which is a biasing member is arrange | positioned. One end of the spring 17 is engaged with the operation portion 23, and the other end is engaged with the side wall 15. The main body 21 of the engaging member 16 passes through the spring 17.

  The insertion tube 14 extends along the axis C <b> 1 and is longer than the adapter body 12. The distal end of the insertion tube 14 protrudes by a predetermined amount from the opening 12 a of the adapter body 12. This predetermined amount is a length sufficient to push open the check valve 7 (see FIG. 1) in the shaft 3 when the feeding tube 2 is attached to the replacement catheter 1. Furthermore, the other end of the insertion tube 14 protrudes from the bottom portion 13 of the adapter main body 12, and the distal end portion 10 a of the tube main body 10 is externally covered here. For this reason, although the tube main body 10 is freely deformable, the axis of the distal end portion 10 a coincides with the axis C <b> 1 of the second connecting means 11. Therefore, in the following description, it is assumed that the axis of the feeding tube 2 at the time of attachment / detachment coincides with the axis C1 of the second connecting means 11. Furthermore, the direction in which the feeding tube 2 is attached to and detached from the replacement catheter body 1 and the direction in which the insertion tube 14 is inserted into and removed from the shaft 3 are parallel to the axis C1. The shaft base end portion 3b or the first connecting means 5 has a color (for example, blue or green) or a fluorescent color that is easy to see compared with the human body skin in order to improve visibility.

Next, the operation in this embodiment will be described.
When the feeding tube 2 is attached to the replacement catheter body 1 attached to the fistula W3, a nurse or the like presses the operation portion 23 of the engaging member 16 against the side wall 15 of the adapter body 12, that is, the operation. The part 23 is pushed radially inward. At this time, the feeding tube 2 is gripped by a finger pressing the operation unit 23.
When the feeding tube 2 is gripped while pushing the operating portion 23 radially inward, the spring 17 is compressed and the engaging member 16 moves to a position (detachment position) near the axis C1 of the adapter body 12, Hold that position. This position is a position where the engagement protrusion 22 at the tip of the engagement member 16 does not contact the upper end surface 5 a of the first connection means 5.
In this state, the feeding tube 2 is pushed into the replacement catheter body 1 while inserting the insertion tube 14 into the shaft 3. When the second connecting means 11 hits the first connecting means 5, the finger is released from the operation unit 23. Since the force acting on the operation portion 23 is removed, the spring 17 is restored, and the engaging member 16 is pushed back radially outward along the through hole 15a. Thereby, as shown in FIG. 1, the engaging protrusion 22 engages with the engaging groove 8, and the feeding tube 2 is mounted on the replacement catheter body 1.

  Further, when removing the feeding tube 2 from the replacement catheter body 1, the operating portion 23 is pushed inward in the radial direction with a finger. As a result, the spring 17 contracts and the engagement member 16 moves from the position engaged with the engagement groove 8 (engagement position) to the position where it is detached, and the first connection means 5 and the second connection The engagement with the means 11 is released. Then, when the operation unit 23 is pushed in with a finger, that is, while the feeding tube 2 is held and pulled out parallel to the direction of the axis C1, the insertion tube 14 is pulled out from the replacement catheter body 1, and the both are separated. The

According to this embodiment, the engaging tube 16 is pushed in a direction substantially perpendicular to the attaching / detaching direction of the feeding tube 2, whereby the feeding tube 2 and the replacement catheter body 1 can be engaged and disengaged. Such a force acts to grip the feeding tube 2, so that the engagement member 16 can be engaged and disengaged and the feeding tube 2 can be gripped simultaneously. Therefore, the attaching / detaching operation of the feeding tube 2 is facilitated. Furthermore, since the feeding tube 2 can be inserted and pulled out in a state where the engagement between the engagement member 16 and the engagement groove 8 is completely released, the wear between the engagement member 16 and the engagement groove 8 is prevented. Can be prevented and durability is improved. And since the wear of the engaging member 16 is prevented, even if the feeding tube 2 is frequently attached and detached, it can be reliably attached and detached.
Further, since the two engaging members 16 are arranged with a phase difference of about 180 °, it is easy to balance the forces acting on the engaging members 16.

Next, a second embodiment of the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the component same as 1st Embodiment. In addition, overlapping explanation is omitted.
In this embodiment, the urging member of the engaging member is arranged inside the adapter main body.

As shown in FIG. 3, the feeding tube 31 has second connection means 32 that engages with the tube body 10.
The second connecting means 32 includes a bottomed cylindrical adapter body 12, the insertion tube 14 penetrating the center of the adapter body 12, an engaging member 16 slidably penetrating the side wall 15 of the adapter body 12, and the adapter body. 12 and a coiled spring (biasing member) 33 that urges the engaging member 16 radially outward.
The spring 33 has one end engaged with the insertion tube 14 and the other end engaged with the engagement member 16. A recess 16a for positioning and holding the spring 33 and a recess 14a are provided on the surface of the engagement member 16 facing the insertion tube 14 and the insertion tube 14, respectively.

  The operations and effects in this embodiment are the same as those in the first embodiment except that the position of the spring 33 is different. That is, when the operation portion 23 is pushed toward the center of the adapter main body 12, the engaging member 16 and the engaging groove 8 (see FIG. 2) are engaged and disengaged, and the feeding tube is applied with such force applied. 31 can be gripped.

Another example in which the urging member is disposed inside the adapter body is shown in FIG. In the feeding tube 41 shown in FIG. 4, the second connecting means 42 slidably penetrates the bottom cylindrical adapter body 12, the insertion tube 14 that penetrates the center of the adapter body 12, and the side wall 15 of the adapter body 12. The engaging member 16 includes a coil-like spring (biasing member) 43 disposed in the adapter main body 12 and biasing the engaging member 16 radially outward.
Here, the adapter main body 12 includes an inner wall 44 on the inner side of the side wall 15. A hole 44a similar to the through hole 15a of the side wall 15 is formed in the inner wall 44, and the main body portion 21 of the engaging member 16 passes therethrough. On the other hand, the engaging member 16 has a plate-like flange 45 extending from a bent portion on the engaging protrusion 22 side to a portion inserted into the through hole 15a. A spring 43 is disposed between the inner wall 44 and the flange 45.
The feeding tube 41 as shown in FIG. 4 has the same operations and effects as those of the first embodiment except that the position of the spring 43 is different. That is, when the operating portion 23 is pushed toward the center of the adapter main body 12, the engaging member 16 and the engaging groove 8 (see FIG. 1) are engaged and disengaged, and the feeding tube is applied with such force applied. 41 can be gripped.

Next, a third embodiment of the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the component same as each said embodiment. In addition, overlapping explanation is omitted.
As shown in FIG. 5, the replacement gastrostomy catheter includes a replacement catheter body 1 and a feeding tube 51.
In the replacement catheter body 1, the first connection means 52 is attached to the proximal end portion 3 a of the shaft 3. The 1st connection means 52 consists of cylindrical members, and the annular engaging groove 53 is formed in the outer wall along the periphery.
The feeding tube 51 includes a tube main body 10 and second connection means 54 attached to the distal end portion 10 a of the tube main body 10. The second connecting means 54 is disposed with a predetermined allowance on the outer side of the bottomed cylindrical adapter body 55, the insertion tube 14 penetrating the bottom portion 56 of the adapter body 55, and the annular side wall 57 of the adapter body 55. A flexible ring member 58 and two engaging members 59 attached to the inner periphery of the ring member 58.

The adapter main body 55 is arranged so that the opening 55 a faces the replacement catheter main body 1, and the inner diameter of the side wall 57 is substantially equal to the outer diameter of the first connecting means 52. Furthermore, in a plan view as shown in FIG. 6, a through hole 60 through which the engaging member 59 passes is formed in the side wall 57 at a position shifted by about 180 °. In the vicinity of the through hole 60, two guide pieces 61 are erected in parallel with respect to one through hole 60 outward in the substantially radial direction.
The engagement member 59 is attached to the ring member 58 so as to protrude inward in the radial direction at each position shifted by about 180 °. Further, one through groove 62 is provided on each side of the position where the engagement member 59 is attached. A guide piece 61 erected from the side wall 57 of the adapter main body 55 is loosely fitted in the through groove 62.

The operation of this embodiment will be described.
When the feeding tube 51 is attached to the replacement catheter body 1, a predetermined position of the ring member 58 is pushed with a finger toward the center of the second connecting means 54 as indicated by an arrow D 1 in FIG. Here, the predetermined position is a position where the phase is shifted by about 90 ° from the position where the engagement member 59 is attached and its vicinity. The portion of the ring member 58 that is pressed by the finger is deformed so as to contact the side wall 57 of the adapter main body 55. Here, since the circumferential length of the ring member 58 does not change, the vicinity of the engaging member of the ring member 58 is deformed toward the outside in the radial direction along the slide member 61. Along with this, the two engaging members 59 also move outward in the radial direction. The position of the engaging member 59 at this time is a position (disengagement position) such that the distance between the engaging members 59 is larger than the outer diameter of the first connecting means 52. Since the feeding tube 51 is gripped by pushing the ring member 58 with a finger in this way, the insertion tube 14 shown in FIG. 5 is inserted into the shaft 3 while maintaining this state. When the first connection means 52 and the bottom portion 56 of the second connection means 54 come into contact with each other, the finger is released from the second connection means 54 to remove the force that has deformed the ring member 58 and restore the shape of the ring member 58. Let Along with this, the engaging member 59 moves to the center side in the radial direction and engages with the engaging groove 53. In this way, the feeding tube 51 is attached to the replacement catheter body 1.

  Further, when the feeding tube 51 is removed from the replacement catheter body 1, the feeding tube 51 is pressed while pushing the predetermined position of the ring member 58 of the second connecting means 54 in the engaged state in the direction of the arrow D1 shown in FIG. 51 is gripped. As the ring member 58 is deformed, the engagement member 59 moves from the engagement position where it engages with the engagement groove 53 to the outside in the radial direction, and the engagement is released. If the second connecting means 54 is pulled out in this state, the feeding tube 51 is removed from the replacement catheter body 1.

According to this embodiment, the engagement member 59 and the engagement groove 53 can be engaged and disengaged by pushing a predetermined position of the ring member 58 in a direction substantially perpendicular to the attaching / detaching direction of the feeding tube 51. Therefore, the feeding tube 51 can be easily attached and detached. Here, since the direction in which the feeding tube 51 is attached and detached and the direction of the force acting on the engaging member 59 are substantially orthogonal, the position of the feeding tube 51 is moved even when the position of the engaging member 59 is maintained. Easy to make.
Further, due to the deformation of the ring member 58, the engaging member 59 holds either the position where the engagement is released or the position where the engaging member 59 is engaged. And wear can be prevented.

Next, a fourth embodiment of the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the component same as each said embodiment. In addition, overlapping explanation is omitted.
FIG. 8 shows a plan view of the feeding tube of the replacement gastrostomy catheter. The feeding tube 71 includes the tube body 10 and the second connection means 72. The second connecting means 72 is disposed on the bottomed cylindrical adapter body 73, the insertion tube 14 penetrating the center of the adapter body 73, and the annular side wall 74 of the adapter body 73 with a phase difference of about 180 °. Two engaging members 75 and a coiled spring (biasing member) 76 disposed in the side wall 74 for biasing the engaging member 75 are included.

  The engaging member 75 has a lever 78 disposed in a receiving hole 77 that penetrates the side wall 74 of the adapter main body 73. The lever 78 is rotatably supported on the adapter main body 73 by a pin 79. An engagement protrusion 80 that protrudes toward the center of the adapter main body 73 is provided at one end of the lever 78. Further, the other end portion of the lever 78 is provided with an operation portion 82 connected by a pin 81. The operation unit 82 is supported by the adapter main body 73 so as to be slidable in the radial direction. Further, in the operation portion 82, one end of the spring 76 is engaged with the surface toward the center. The other end of the spring 76 is engaged with the side wall 74 of the adapter main body 73.

When the feeding tube 71 is attached to the replacement catheter body 1 (see FIG. 5), the feeding tube 71 is gripped while pushing the operating portion 82 toward the center in the radial direction. Thereby, the operation unit 82 moves while contracting the spring 76. Along with this, the lever 78 connected by the pin 81 rotates around the pin 79, and the engagement protrusion 80 moves to the radially outer disengagement position. Then, in a state where the feeding tube 71 is gripped by the operation unit 82, the second connecting means 72 is moved until it comes into contact with the first connecting means 52. Thereafter, when the finger is released from the operation portion 82 of the engagement member 75, the operation portion 82 is pushed back by the spring 76, the lever 78 is rotated, and the engagement protrusion 80 moves toward the center of the second connection means 72. To do. Thereby, the engagement protrusion 80 and the engagement groove 53 of the first connection means 52 are engaged, and the feeding tube 71 is attached to the replacement catheter body 1.
Further, when the feeding tube 71 is removed from the replacement catheter body 1, the operation portion 82 is pushed in and moved from the engagement position where the engagement protrusion 80 engages with the engagement groove 53 to the disengagement position. Further, while maintaining this state, the second connection means 72 is pulled out in the direction of the axis C1.

According to this embodiment, since the engaging member 75 can be engaged with and disengaged from the engaging groove 53 by pushing the operating portion 82 in a direction substantially orthogonal to the attaching / detaching direction of the feeding tube 71, the feeding tube 71 can be easily attached and detached. Since the direction in which the feeding tube 71 is attached / detached and the direction of the force acting on the engaging member 75 are substantially perpendicular to each other, the feeding tube 71 is gripped while the position of the engaging member 75 is maintained, and Can be moved.
Further, since the engagement protrusion 80 holds either the disengagement position or the engagement position by the operation of the operation portion 82, wear of the engagement protrusion 80 and the engagement groove 53 can be prevented. Here, if the distance from the pin 79 to the engagement protrusion 80 is longer than the distance from the pin 79 to the pin 81, the engagement protrusion 80 can be moved greatly even when the operation amount of the operation portion 82 is small. become.

The present invention can be widely applied without being limited to the above-described embodiments.
For example, the second connecting means 11, 32, 42, 54, 72 may not include the insertion tube 14. In this case, the tube main body 10 passes through the adapter main bodies 12, 55 and 73 and is inserted into the shaft 3 of the replacement catheter main body 1. The adapter bodies 12, 55, 73 may be directly fixed to the tube body 10. Further, the shape of the stopper is not limited to the bumper 4 as shown in FIG. 1, but may be a balloon or the like. Further, the springs 17, 33, 43, 76 may be leaf springs or elastic members such as rubber.
Further, the engagement grooves 8 and 53 of the first connection means 5 and 52 may have a shape lacking an annular portion.
Furthermore, the attaching / detaching direction of the feeding tubes 2, 31, 41, 51, 71 is a direction in which the first connecting means 5, 52 and the second connecting means 11, 32, 42, 54, 72 are out of diameter. The axis of the tube body 10 and the axis of the shaft 3 may be in a direction different from the attaching / detaching direction.

It is a schematic diagram of the gastrostomy catheter for replacement | exchange in embodiment of this invention. It is a partial expanded sectional view of the catheter main body for exchange and a feeding tube. It is a partially expanded sectional view of a feeding tube. It is a partially expanded sectional view of a feeding tube. It is a partial expanded sectional view of the catheter main body for exchange and a feeding tube. It is sectional drawing along the AA line of FIG. It is a figure explaining operation | movement of a feeding tube. It is sectional drawing perpendicular | vertical to the axis line of a feeding tube.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Replacement catheter main body 2, 31, 41, 51, 71 Feeding tube 3 Shaft 4 Bumper 5, 52 First connection means (main body side connection means)
8, 53 engaging groove 11, 32, 42, 54, 72 second connection means (tube side connection means)
12,55 Adapter body (tubular member)
16, 59, 75 Engagement member 17, 33, 43, 76 Spring (biasing member)
58 Ring member C1 Axis (detachment direction)
W1 Abdominal wall W2 Gastric wall W3 Fistula

Claims (4)

An exchange gastrostomy catheter comprising an exchange catheter body attached to a fistula formed between an abdominal wall and a gastric wall, and a feeding tube detachable from the exchange catheter body,
The replacement catheter main body has a hollow shaft, and a distal end portion of the shaft is provided with a stopper having a larger diameter than the shaft, and a cylindrical member is provided at the proximal end portion of the shaft. The main body side connecting means is provided with a substantially annular engaging groove along the circumferential direction thereof.
The feeding tube has a hollow tube main body, and a tube side connection means connectable to the main body side connection means is provided at a distal end portion of the tube main body, and the tube side connection means includes the exchange catheter. An engagement member that releases the engagement with the engagement groove when a force that is substantially orthogonal to the attachment / detachment direction to the main body and that is directed radially inward of the feeding tube is applied ;
When the engagement between the engagement groove and the engagement member is released by the force, the replacement catheter body and the feeding tube are relatively moved by a linear motion in the axial direction of the feeding tube. close to or replacement gastrostomy catheter, characterized in separable der Rukoto. A feeding tube detachably attached to a replacement catheter body mounted on a gastrostoma, having a hollow tube body and tube side connection means fixed to the tube body, the tube side connection means, Engagement with an engagement groove provided on the replacement catheter body side when a force that is substantially perpendicular to the attaching / detaching direction to the exchange catheter body and directed radially inward of the feeding tube is applied. An engagement member for releasing
When the engagement between the engagement groove and the engagement member is released by the force, the replacement catheter body and the feeding tube are relatively moved by a linear motion in the axial direction of the feeding tube. close to or feeding tube, wherein separable der Rukoto.   3. The tube-side connecting means includes a pair of the engaging members arranged to face each other and a biasing member that biases the pair of engaging members in a direction away from each other. Feeding tube as described in.   The tube side connecting means includes a cylindrical member, a ring member that covers an outer periphery of the cylindrical member with a predetermined bending allowance, and a plurality of engaging members provided on an inner peripheral surface of the ring member, The feeding tube according to claim 2, wherein the engaging member releases the engagement with the engaging groove when the ring member is bent.

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