JPH11188010A - Catheter with pressure sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a maneuverable catheter with pressure sensor capable of changing freely its shape with a light torque during operation while keeping the initial shape. SOLUTION: A pressure sensor part 3 is mounted in the front of a catheter main body 4 and a top catheter part is amounted to the front of the mounted pressure sensor part 3 and a resistance box 5 is amounted in the back of the catheter main body 4 and a connector part 7 is amounted to the back of the resistance box 5 using an electric wire 6. On a top catheter part 1, a core member is placed inside of an external member and a filling member is filled in the space between the external member and the core member. The pressure sensor part 3 is connected to the back of top catheter part 1 with an adhesive.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a catheter equipped with a pressure sensor.

[0002]

2. Description of the Related Art Gastric pressure, duodenal pressure, biliary pressure and the like are measured through an endoscope. In the conventional method, warm water was flowed to a measurement site with a catheter, and measurement was performed with an externally installed pressure sensor. However, the temperature and the flow velocity of the hot water vary, and there is a problem in the credibility when the positioning of the heart and the pressure sensor is considered. The present invention has been devised to solve this problem and to obtain the same measurement value for everyone.

[0003]

Means for Solving the Problems [1] According to the present invention, a pressure sensor section 3 is mounted in front of a catheter body section 4, a distal catheter section 1A is mounted in front of the pressure mounting section 3, and a catheter body section 4 is mounted. Is mounted on the rear side of the resistance box 5, and a connector 7 is mounted on the rear side of the resistance box 5 via an electric wire 6. A gap between the material 8 and the core material 9 is filled with a filler 10, and a pressure sensor-equipped catheter CA-1A (CA-2A) in which the pressure sensor unit 3 is connected via an adhesive 11 behind the distal catheter unit 1A. provide. [2] In the present invention, the pressure sensor section 3 is mounted in front of the catheter body section 4, the distal catheter section 1B is mounted in front of the pressure mounting section 3, and the resistance box 5 is mounted behind the catheter body section 4. The connector section 7 is mounted behind the resistance box 5 via the electric wire 6, the distal catheter section 1B is mounted with the distal protection member 14 at the distal end of the mesh catheter 13B, and the distal catheter section 1B is mounted behind the distal catheter section 1B. Catheter CA-1B with pressure sensor (CA-2B) to which pressure sensor unit 3 is connected via adhesive 11
I will provide a. [3] In the present invention, the pressure sensor unit 3 is mounted in front of the catheter main body 4, the distal catheter unit 1 C is mounted in front of the pressure mounting unit 3, and the resistance box 5 is mounted in the rear of the catheter main body 4. A connector 7 is attached to the back of the resistance box 5 via an electric wire 6. The distal catheter section 1 </ b> C has a core 9 disposed inside an outer member 8 and a gap between the outer member 8 and the core 9. A filling tube 10 is filled with a filler 10 and a mesh tube 13C
And a pressure sensor-equipped catheter CA-1 in which a pressure sensor part 3 is press-fitted behind the tip catheter part 1C.
C (CA-2C). [4] The present invention provides a guidewire insertion port 1 in the middle of the distal catheter sections 1A, 1B, 1C according to [1] to [3].
5A, 15B, and 15C, and a guide wire outlet 1 at the distal ends of the distal catheter sections 1A, 1B, and 1C.
The catheters CA-3A, 3B, and 3C with pressure sensors having the distal end catheter portions 3A, 3B, and 3C provided with the distal end protection members 14A, 14B, and 14C that form 6A, 16B, and 16C and that are formed of an elastic material. provide.

[0004]

FIG. 1 is a schematic view of a catheter CA with a pressure sensor according to the present invention. In the catheter CA with a pressure sensor, a pressure sensor unit 3 is mounted in front of a catheter body 4.
The distal catheter section 1 is mounted in front of the pressure sensor section 3 and the resistance box 5 is mounted behind the catheter body section 4, and a connection connector section 7 is connected to the resistance box 5 via an electric wire 6. Have been. The distal catheter section 1 is made of a flexible material that is self-holding and can be freely deformed with a small torque, and the distal end is formed into a curved surface. The catheter body 4 is made of a torque-resistant material such as polyurethane, and the inside thereof is protected by passing a lead wire 3L of a pressure sensor. A pressure sensor 3S is disposed inside the pressure sensor section 3, and the distal end catheter section 1 and the catheter body section 4 are connected to both ends.
Inside the resistance box 5, a pressure sensor characteristic adjusting substrate 5 is provided.
B is stored.

FIGS. 2 to 4 show a catheter C with a pressure sensor.
It is an expanded sectional view showing an example of tip catheter 1 of A. The distal catheter section 1A of the catheter CA-1A with a pressure sensor shown in FIG. 2 is constituted by disposing a core material 9 made of a shape memory alloy such as titanium alloy or a guide wire inside a flexible outer member 8 made of polyurethane, for example. A gap is filled between the core member 9 and the outer member 8 by filling an elastic filler 10 such as silicone resin. The distal catheter section 1B of the catheter CA-1B with a pressure sensor in FIG.
B is configured by attaching an elastic tip protection member 14 such as silicone rubber to the tip of B. Tip catheter section 1 of catheter CA-1C with pressure sensor in FIG. 4
2C, the rear end of the core material 9 of the distal catheter section 1A of FIG. 2 is projected from the rear end of the outer member 8, and the mesh-filled tube 13C
The connection member 13 is connected.

FIGS. 5 to 7 are enlarged sectional views showing an embodiment of the connection mode between the distal catheter section 1 and the pressure sensor section 3 of the catheter CA with a pressure sensor shown in FIG. The catheter CA-2A with a pressure sensor shown in FIG.
The pressure sensor 3 is connected to the rear of A via an adhesive 11. When applying the adhesive 11 to the distal catheter section 1, the adhesive 11 is prevented from directly contacting the core material 9. Therefore, the entire length of the core member 9 is shorter than that of the outer member 8, and the rear end of the core member 9 is disposed deep inside the outer member 8. Thus, there is no danger that the adhesive 11 contacts the core 9 and affects the characteristics of the pressure sensor (drift increases). The pressure sensor-equipped catheter CA-2B in FIG. 6 is such that the pressure sensor unit 3 is connected to the rear of the distal catheter unit 1B in FIG. The setting of the pressure sensor-equipped catheter CA-2B can be freely changed according to the desired strength of the catheter itself. The catheter CA-2C with a pressure sensor of FIG. 7 extends the rear end of the core material 9 of the distal catheter section 1C of FIG. 4 and attaches the pressure sensor section 3 behind the distal catheter section 1C without using an adhesive. They are press-fitted.

Next, the catheter CA with a pressure sensor of the present invention
An example of how to use and an example of its operation will be described. That is, the catheter body 4 is gradually inserted from the distal catheter section 1 through the side hole of the endoscope inserted into the patient, and the distal catheter section 1 is gradually inserted from the hole on the distal end side of the endoscope into the target site. I do. The applied pressure received by the pressure receiving unit 2 is detected by the pressure sensor unit 3, and a signal of the detected pressure is transmitted to a monitor (not shown) via the catheter body 4, the resistance box 5, the electric wire 6, and the connector 7.

[0008] Catheter CA- with pressure sensor of the present invention
In (1A, 1B, 1C, 2A, 2B, 2C), a filler 10 having elasticity like the distal catheter section 1A, 1C is filled between the core material 9 and the outer member 8, and the distal catheter section 1B
Since the distal end protecting member 14 having elasticity is attached to the distal end of the meshed catheter 13B, even if a large bending stress is applied, the distal end catheter portions 1A, 1B, 1C
It is safe because there is no need to worry about breaking through. Further, in the distal catheters 1A and 1C, since the filler 10 having elasticity exists between the core 9 and the outer member 8, the movement of the core 9 is free and flexible.

Further, since the distal catheter section 1C employs the meshed catheter 13B, the distal catheter section 1C can be set in any shape while maintaining the strength of the pressure sensor-equipped catheter CA. In the distal catheter section 1A, the entire length of the core member 9 is formed shorter than the entire length of the outer member 8, and the rear end of the core member 9 is set so as to be deeply accommodated in the outer member 8. When connecting 1A with the adhesive 11, there is no opportunity for the core material 9 to come into contact with the adhesive 11, and the performance of the pressure sensor 3S can be maintained. In the distal catheter section 1C, the degree of freedom of design can be maintained while maintaining the strength of the distal catheter section 1C at a low cost by employing the mesh-containing tube 13C in which the used length of the catheter 13B is shortened.

In the catheters CA-3A, 3B, and 3C with a pressure sensor shown in FIGS. 8 to 10, a guide wire insertion port is further formed in the distal catheter section so that the entire catheter can be easily guided to an affected area. The catheter CA-3A with a pressure sensor in FIG. 8 has a guide wire insertion port 15A formed in the middle of the distal catheter section 3A, and a distal protection member 14A having elasticity such as polyurethane is attached to the distal end of the distal catheter section 3A. . Tip protection member 14
A guide wire outlet 16A is formed at the tip of A. The distal catheter section 3A has the simplest shape into which a guide wire can be inserted. The distal catheter section 3B of the pressure sensor-equipped catheter CA-3B in FIG. 9 is obtained by improving the distal catheter section 3A to a shape that does not receive bending stress when a guide wire is inserted. The distal catheter section 3B is formed such that a guide wire insertion port 15B is formed in the bent portion by bending the middle part into a Z-shape. Tip catheter section 3C of catheter CA-3C with pressure sensor in FIG. 10
The tip catheter section 3 has a shape that minimizes bending stress when a guide wire is inserted and does not catch the insertion when the guide wire is inserted.
A and 3B are improved. Tip catheter part 3C
The shape of the guide wire insertion opening 15C formed in the middle is improved so that the position near the distal end protection member 14C is opened larger (deeper) so that the guide wire is easily inserted and the bending stress is reduced. is there.

The distal catheter section 3A of FIGS.
3B and 3C are attached to the distal ends of the catheters CA-1A, 1B and 1C (2A, 2B and 2C) with pressure sensors instead of the distal catheter sections 1A, 1B and 1C of FIGS. 2 to 4 (FIGS. 5 to 7). And a new catheter CA-3 with pressure sensor
Used as A, 3B, 3C. For example, FIG. 2 (FIG. 4)
In the distal catheter section 1A (1C), a guide wire insertion port 15 is provided on the side of the outer member 8, the core material 9, and the filler 10.
A, 15B and 15C are formed, and guide wire outlets 16A and 16A are formed at the distal end portions of the outer member 8, the core material 9 and the filler 10.
B, 16C are formed, and communication holes (not shown) for the guide wire insertion ports 15A, 15B, 15C are formed inside the core material 9. In the distal catheter section 1B of FIG. 3, guide wire insertion ports 15A, 15B, 15C are formed on the side of the mesh catheter 13B, and guide wire outlets 16A, 16C are formed at the distal end of the distal protection member 14.
B, 16C are formed, and a communication port (not shown) for the guide wire insertion ports 15A, 15B, 15C is formed inside the distal end protection member 14. Distal catheter sections 3A, 3B,
The length D of 3C is preferably formed between 20 mm and 50 mm.

[0012]

According to the pressure sensor-equipped catheter CA according to any one of claims 1 to 3, while maintaining the initial set shape,
The operability is good because the shape can be changed freely with a small torque during the procedure. Further, the tip catheter section 1
The selection of the shapes A, 1B, and 1C can be made widely according to the purpose of the procedure. The catheters CA-3A, 3B, and 3C with a pressure sensor according to claim 4 can be easily inserted into a target site (affected area) by passing a guide wire through the distal catheter sections 3A, 3B, and 3C having a simple structure. ,
(B) The distal end portions of the distal catheter portions 3A, 3B, 3C are protected by a distal end protection member 14A made of an elastic material.
Since 14B and 14C are worn, there are advantageous effects such as safety for organs.

[Brief description of the drawings]

FIG. 1 is a schematic view of a catheter with a pressure sensor of the present invention.

FIG. 2 is an enlarged sectional view showing an embodiment of the distal catheter section of FIG. 1;

FIG. 3 is an enlarged sectional view showing an embodiment of the distal catheter section of FIG. 1;

FIG. 4 is an enlarged sectional view showing an embodiment of the distal catheter section of FIG. 1;

FIG. 5 is an enlarged sectional view showing an embodiment of a connection mode between the distal catheter section and the pressure sensor section in FIG. 1;

FIG. 6 is an enlarged sectional view showing an embodiment of the connection mode between the distal catheter section and the pressure sensor section in FIG. 1;

FIG. 7 is an enlarged sectional view showing an embodiment of a connection mode between the distal catheter section and the pressure sensor section in FIG. 1;

FIG. 8 is a partially enlarged view showing another embodiment of the catheter with a pressure sensor of the present invention.

FIG. 9 is a partially enlarged view showing another embodiment of the catheter with a pressure sensor of the present invention.

FIG. 10 is a partially enlarged view showing another embodiment of the catheter with a pressure sensor of the present invention.

[Explanation of symbols]

CA-1A, 1B, 1C (2A, 2B, 2C) Catheter with pressure sensor 1, 1A, 1B, 1C Tip catheter section 2 Pressure receiving section 3 Pressure sensor section 3S Pressure sensor 3L Lead wire of pressure sensor 4 Catheter body section 5 Resistance Box 5B Pressure sensor characteristic adjustment board 6 Electric wire 7 Connection connector section 8 Outer member 9 Core material 10 Filler material 11 Adhesive 13 Connection member 13B Meshed catheter 13C Meshed tube 14 Tip protection member CA-3A, 3B, 3C Pressure sensor Attached catheter 3A, 3B, 3C Tip catheter section 14A, 14B, 14C Tip protection member 15A, 15B, 15C Guide wire insertion port 16A, 16B, 16C Exit of guide wire

Continuing from the front page (72) Inventor Koichi Sasa 1-26-7 Yokoyamadai, Sagamihara City, Kanagawa Prefecture Inside the Sagamihara Works of Kawasumi Chemical Industry Co., Ltd. (72) Inventor Sachiko Hiruma 1-26-7 Yokoyamadai, Sagamihara City, Kanagawa Prefecture Kawasumi Chemical Industry Co., Ltd.

Claims (4)

[Claims] 1. A pressure sensor section 3 is mounted in front of a catheter main body 4, a distal catheter section 1A is mounted in front of the pressure mounting section 3, and a resistance box 5 is mounted in the rear of the catheter main body 4. A connector 7 is attached to the rear of the resistance box 5 via an electric wire 6. The distal catheter section 1 </ b> A has a core 9 disposed inside an outer member 8 and fills a gap between the outer member 8 and the core 9. A catheter CA-1A with a pressure sensor (CA-2A), characterized in that a material 10 is filled and a pressure sensor unit 3 is connected to the rear of the distal catheter unit 1A via an adhesive 11. 2. A pressure sensor section 3 is mounted in front of the catheter body section 4, a distal catheter section 1B is mounted in front of the pressure mounting section 3, and a resistance box 5 is mounted behind the catheter body section 4. A connector 7 is attached to the rear of the resistance box 5 via an electric wire 6.
A catheter CA-1B with pressure sensor (CA-2B) characterized in that a distal end protection member 14 is attached to the distal end of 3B, and the pressure sensor unit 3 is connected via an adhesive 11 behind the distal catheter unit 1B. . 3. A pressure sensor section 3 is mounted in front of the catheter body 4, a tip catheter section 1C is mounted in front of the pressure mounting section 3, and a resistance box 5 is mounted behind the catheter body 4. A connector 7 is attached to the rear of the resistance box 5 via an electric wire 6. The distal catheter section 1 </ b> C has a core 9 disposed inside an outer member 8 and fills a gap between the outer member 8 and the core 9. Material 10 is filled, a mesh tube 13C is attached to the back of the material via an adhesive 11, and a pressure sensor catheter CA-1C (CA-C) having a pressure sensor unit 3 press-fitted behind the distal catheter unit 1C.
2C). 4. A guide wire insertion port 15A, 15B, 15C is formed in the middle of the distal catheter section 1A, 1B, 1C according to claim 1 and a guide is provided at the distal end of the distal catheter section 1A, 1B, 1C. Catheter CA-3A, 3B with pressure sensor having distal catheter sections 3A, 3B, 3C on which distal protective members 14A, 14B, 14C are formed, which form wire outlets 16A, 16B, 16C and are made of an elastic material. , 3C.