JP3638066B2 - Catheter with sensor mechanism - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a catheter with a sensor mechanism having a sensor portion at the tip of a catheter tube inserted into the body.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a catheter is known as a type of intracorporeal medical instrument. A catheter tube having a diameter of several mm or less constituting a catheter is inserted into various tubes such as blood vessels in the human body. The distal end of the catheter tube is guided to a desired site in the body, and a measurement action (for example, blood pressure measurement) or a treatment action (for example, blood vessel dilation) is performed at the site. For this reason, the operator of the catheter needs to reliably guide the distal end of the catheter tube to a desired site by an external operation.
[0003]
By the way, the tube in the body is not necessarily linear, and is often partially bent or branched. In addition, the diameter of the tube is not necessarily constant, and the tube itself may be thin, or the tube may be thin due to an obstacle (for example, a thrombus) inside. Therefore, in a conventional catheter that does not have a means for detecting the situation ahead of the direction of travel of the catheter tube, the operator has to rely only on his or her intuition for the operation of the tube. Therefore, inconveniences such as requiring skill to guide the tip of the tube to a desired site have occurred.
[0004]
Here, an example of the catheter 51 with a sensor mechanism, which has been devised to eliminate the inconvenience, is shown in FIG. A pressure barrier 53 is provided on the distal end side of the catheter tube 52 that constitutes the catheter 51, and thereby a chip accommodating chamber 54 is partitioned in the tube 52. For the pressure barrier 53, for example, a plate made of stainless steel or ceramics is often used. A semiconductor pressure sensor chip 56 is housed and fixed in the chip housing chamber 54 in a state of being placed on the pedestal 55. In addition, the tip accommodating chamber 54 is filled with a pressure transmission medium 57, and a piston 58 is movably provided at the distal end side opening of the tube 52 in order to seal it.
[0005]
Therefore, in this catheter 51 with a sensor mechanism, when the pressure acting on the outer surface of the piston 58 serving as the pressure receiving portion varies, the influence is transmitted to the pressure sensitive surface of the sensor chip 56 via the pressure transmission medium 57. As a result, the presence or absence of an obstacle or the like in the forward direction of the catheter tube 52 is detected.
[0006]
[Problems to be solved by the invention]
However, in the case of the conventional catheter 51 with a sensor mechanism, the smaller the diameter of the catheter tube 52, the more difficult it is to assemble the pressure barrier 53 in the tube 52, which can surely prevent the flow of the pressure transmission medium 57. Becomes difficult. Moreover, even if the pressure barrier 53 is assembled inside, a gap is easily formed between the tube 52 and the like, and the inside cannot be reliably closed. Therefore, due to the flow of the pressure transmission medium 57 toward the proximal end of the tube 52, there is a problem that the pressure is not accurately transmitted and the sensing accuracy of the catheter 51 is lowered. Therefore, in the past, if priority was given to increasing the accuracy of the catheter 51, the diameter of the catheter 51 had to be reduced.
[0007]
The present invention has been made in view of the above problems, and an object of the present invention is to provide a catheter with a sensor mechanism having a high sensing accuracy and a structure suitable for reducing the diameter.
[0008]
Another object of the present invention is to provide a catheter with a sensor mechanism that is easy to manufacture, is unlikely to fail, and is suitable for use in a living body.
[0009]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, in the invention according to claim 1, a sensor part having a pressure receiving part, a pressure transmission medium, and a pressure sensing means is disposed on the distal end side of the catheter tube, and pressure fluctuation is caused by the sensor part. In the catheter with a sensor mechanism in which the pressure sensing means is fixed in the sensor unit, the bonding material is filled with a fluid substance and cured, and the pressure is The gist of the catheter with a sensor mechanism is that it also serves as a pressure barrier that prevents the flow of the transmission medium to the tube proximal end side.
[0010]
According to a second aspect of the present invention, in the first aspect, the sensor unit includes a tube member that is formed as a separate body from the catheter tube and is fitted to a distal end side of the catheter tube, and the pressure-sensitive means. Is fixed to the inner wall surface of the tube member by the bonding material, and the bonding material seals the through hole of the tube member in a non-through state.
[0011]
According to a third aspect of the present invention, in the second aspect, the pressure sensitive means is a semiconductor type pressure sensor chip, and the sensor chip is mounted on a distal end side of the tube member in a state of being placed on a pedestal. It is assumed that it is fixed to the notch.
[0012]
According to a fourth aspect of the present invention, in the third aspect, the bonding material is made of an insulating material, and at least the bonding wire drawn out from the sensor chip is entirely sealed.
[0013]
According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the bonding material is made of a hard and biocompatible material.
Hereinafter, the “action” of the present invention will be described.
[0014]
According to the first to fifth aspects of the present invention, since the bonding material formed by filling and hardening the fluid substance is used as a pressure barrier, the inside of the catheter tube having a small diameter is a conventional solid pressure. It is reliably closed without a gap compared to the barrier. Therefore, a structure suitable for reducing the diameter of the catheter can be obtained. As a result of the pressure barrier preventing the pressure transmission medium from flowing in the tube proximal direction, so-called pressure escape in the same direction is prevented. Therefore, the difference between the increase in pressure acting on the pressure receiving portion and the increase in pressure in the pressure transmission medium is reduced, and an accurate pressure can be transmitted to the pressure sensing means. For this reason, sensing sensitivity improves.
[0015]
In the present invention, since the bonding material also serves as a pressure barrier as described above, the number of parts can be reduced, and the cost can be reduced.
According to the second aspect of the present invention, since a sensor unit including a tube member prepared as a separate body in advance is used, a desired catheter can be obtained simply by fitting it to the distal end side of an existing catheter tube. be able to. For this reason, unlike the conventional case where each element constituting the sensor unit is directly incorporated in the catheter tube, the catheter can be easily manufactured.
[0016]
According to the third aspect of the present invention, since the extremely small semiconductor pressure sensor chip is used as the pressure sensing means, the diameter of the sensor unit itself is reduced as compared with the case where other pressure sensing methods are employed. be able to. Moreover, it can be used practically. Furthermore, when the notch is provided on the distal end side of the tube member, the sensor chip mounted on the pedestal can be relatively easily fixed to the tube member using a bonding material. Therefore, the catheter can be easily manufactured.
[0017]
According to the fourth aspect of the invention, since the bonding material is an insulating material, a short circuit in the bonding wire portion is avoided in advance, and a failure is less likely to occur.
According to the fifth aspect of the present invention, the pressure barrier also becomes hard as the joining material becomes hard, so that the escape of pressure toward the tube proximal end is more reliably prevented. Therefore, more accurate pressure can be transmitted to the pressure sensing means, and the sensing sensitivity is further improved. Moreover, since it is a bonding material made of a biocompatible material, a catheter having high compatibility with a living body can be realized.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment in which the present invention is embodied in a catheter 1 having a sensor mechanism for detecting an obstacle will be described in detail with reference to FIGS.
[0019]
This vascular catheter 1 is provided at the proximal end of a tube 2 (in this embodiment, made of polyvinyl chloride, diameter 1.6 mm) 2 to be inserted into the blood vessel and to operate it outside the body. Operating means. The operation means is configured by, for example, a plurality of wires inserted into the tube 2 and a wire operation unit for operating them. In addition, a pressure feed pump or the like for supplying a chemical solution such as a contrast medium is connected to the proximal end portion of the tube 2 on the distal end side of the tube 2.
[0020]
In the catheter 1 of the present embodiment, a sensor assembly 3 as a sensor unit formed separately from the catheter tube 2 is attached to the distal end side of the catheter tube 2.
[0021]
FIG. 1 shows an outer tube 4 constituting the sensor assembly 3, and FIG. 2 shows an inner tube 5 constituting the sensor assembly 3. A distal end side of the outer tube 4 that is an outer tube member is a large-diameter portion 4 a having an outer diameter substantially equal to the outer diameter of the catheter tube 2. On the other hand, the proximal end side of the outer tube 4 is a small diameter portion 4b having an outer diameter smaller than that of the large diameter portion 4a. Since the small diameter portion 4b is a portion that is fitted to the distal end side of the catheter tube 2, a plurality of retaining grooves 6 extending along the circumferential direction are formed on the outer peripheral surface thereof. A piston 7 as a pressure receiving portion is fitted in the opening on the distal end side of the outer tube 4 so as to be movable along the longitudinal direction of the tube 2. Further, the joint portion between the piston 7 and the outer tube 4 is sealed with a sealing material 8.
[0022]
The inner tube 5 that is an inner tube member is a cylindrical member that has a smaller outer diameter and a shorter length than the outer tube 4, and is fitted in the outer tube 4 so as not to slide. A notch 9 is formed at one end of the inner tube 5 protruding into the large diameter portion 4a. A base 11 on which a semiconductor pressure sensor chip 10 as pressure sensing means is placed is joined to the inner wall surface of the notch 9 by a joining material A1. Further, the bonding material A1 is obtained by curing a fluid material.
[0023]
It is most desirable that the bonding material A1 satisfy all three requirements: a) made of an insulating material, b) hard, and c) made of a biocompatible material. In view of such circumstances, in this embodiment, a thermosetting resin such as an epoxy resin is used. This is because the epoxy resin satisfies all the above three requirements. In addition to this, it is also possible to use a resin such as a silicone resin or a polyurethane resin. Moreover, you may use photocurable resin.
[0024]
A back pressure chamber 19 may be formed between the upper surface of the base 11 and the lower surface of the sensor chip 10 as shown in FIG. Further, the back pressure chamber 19 may be communicated with the relative pressure region through a back pressure hole (not shown) formed in the base 11.
[0025]
As shown in FIG. 3A, the semiconductor pressure sensor chip 10 has a thin portion at the center, and a strain gauge 12 is formed on the upper surface of the thin portion. A bonding pad (not shown) formed on the upper surface of the sensor chip 10 and the relay tab 14 of the flat cable 13 are electrically connected via a bonding wire 15. The flat cable 13 passes through the catheter tube 2 and reaches the proximal end portion of the tube 2.
[0026]
As shown in FIG. 3A and the like, the bonding material A1 fixes the pedestal 11 by sealing a gap between the lower surface and the side surface of the pedestal 11 and the inner wall surface of the cutout portion 9 of the inner tube 5. I am trying. In addition to this, in the region near the base end portions of the base 11 and the sensor chip 10, the bonding material A1 also wraps upward to seal the through hole of the inner tube 5 in a non-through state. Therefore, the pressure barrier 16 is formed in the inner tube 5 at a position slightly closer to the base end than the notch 9. The pressure barrier 16 totally seals the bonding wire 15 drawn from the sensor chip 10. A medium accommodating space 17 is defined in the outer tube 4 by the pressure barrier 16 and filled with a silicone gel 18 as a pressure transmission medium. The pressure barrier 16 serves to prevent the silicone gel 18 from flowing toward the proximal end of the tube 2.
[0027]
Of the members constituting the sensor assembly 3, those exposed to the outside are preferably formed of a biocompatible material. Therefore, in this embodiment, the outer tube 4 is made of SUS304, the piston 7 is made of PTFE (polytetrafluoroethylene), and the sealing material 8 is made of silicone resin. Further, it is desirable that the adhesive 20 that bonds the joint portion between the sensor assembly 3 and the catheter tube 2 is also made of a biocompatible material such as silicone resin.
[0028]
As shown in FIGS. 3B and 3C, the catheter tube 2 has a separation wall 21 that divides the inside of the tube 2 into two regions along the axial direction of the tube 2. And by this separation wall 21, a semicircular signal line lumen 22 for accommodating the flat cable 13, and a semicircular chemical supply lumen 23 for supplying a contrast medium or the like as a chemical liquid, Is partitioned. The lumen 23 for supplying a chemical solution has a through hole 24 opened on the outer peripheral surface of the catheter tube 2, and the contrast agent is supplied to the outer peripheral surface side of the tube 2 through the through hole 24. . The opening on the distal end side of the liquid supply lumen 23 is sealed with a sealing plug 25.
[0029]
The sensor assembly 3 as described above is manufactured, for example, by the following procedure. First, after mounting the sensor chip 10 on the pedestal 11, the sensor chip 10 and the flat cable 13 are wire-bonded. Next, the flat cable 13 is inserted into the inner tube 5. A pedestal 11 is disposed in the notch 9, and a fluid material that will later become the bonding material A1 is filled into a predetermined portion of the notch 9 of the inner tube 5. Next, the fluid substance is cured by heat from a heater or the like. As a result, the base 11 and the sensor chip 10 are fixed to the inner wall surface of the notch 9, and the pressure barrier 16 is formed at a position closer to the base end than the notch 9.
[0030]
Subsequently, the inner tube 5 is fitted through the opening on the small diameter portion 4 b side of the outer tube 4. Thereafter, the silicone gel 18 is filled into the outer tube 4 through the opening on the large diameter portion 4 a side of the outer tube 4. Further, after the opening is sealed with the piston 7, the joint portion is sealed with the sealing material 8.
[0031]
The sensor assembly 3 obtained in this way is further attached to the distal end side of the existing catheter tube 2 as follows. First, the flat cable 13 is inserted through the signal line lumen 22 of the catheter tube 2. Next, the small-diameter portion 4 b of the outer tube 4 constituting the sensor assembly 3 is fitted so as to be inserted from the opening on the distal end side of the catheter tube 2, and the joint portion between the two 2 and 4 is bonded by the adhesive 20.
[0032]
Next, sensing by the catheter 1 of the present embodiment including the sensor assembly 3 will be described.
When the situation in the forward direction of the distal end of the catheter tube 2 changes, the insertion resistance of the tube 2 changes, and the pressure acting on the piston 7 changes accordingly. For example, when there is an obstacle (such as a thrombus or a tumor) or a stenosis site inside the blood vessel into which the tube 2 is inserted, the insertion resistance is increased by pressing the head of the sensor assembly 3 against the same site. . Accordingly, the pressure acting on the piston 7 also increases accordingly. When such a change occurs, the pressure of the silicone gel 18 filled in the medium accommodation space 17 increases, and as a result, the pressure applied to the thin portion of the sensor chip 10 also increases. That is, a change in pressure that occurs outside the sensor assembly 3 is indirectly transmitted to the sensor chip 10 via the silicone gel 18. Then, the strain of the thin portion of the sensor chip 10 increases, and the resistance value of the strain gauge 12 on the sensor chip 10 changes. At this time, the sensor chip 10 outputs a change in pressure to the outside as an electrical signal. The output electric signal is input and processed into an electric circuit at the proximal end portion of the tube 2 via the bonding wire 15 and the flat cable 13 and visualized thereby. Therefore, the operator can reliably detect the situation ahead of the traveling direction, that is, the presence or absence of an obstacle or a stenosis, using the visualized data as a judgment material. That is, the operator only has to point the head of the sensor assembly 3 in such a direction that the pressure decreases by manipulating the wire in the above case. The sensor assembly 3 can be used not only for sensing the above items but also for measuring blood pressure, for example. Further, in the case of performing blood vessel contrast in order to grasp the position of the sensor assembly 3 in more detail, the contrast agent may be supplied to the drug solution supply lumen 23 and discharged from the through hole 24. However, a liquid other than the contrast agent, for example, a pharmaceutical such as a thrombolytic agent may be supplied to the lumen for supplying a chemical solution 23. Further, blood or the like can be collected through the chemical solution supply lumen 23.
[0033]
Now, characteristic effects in the present embodiment are listed below.
(A) As described above, the catheter 1 of the present embodiment can reliably guide the distal end of the catheter tube 2 to a desired site in the blood vessel. In addition, in this embodiment, a part of the bonding material A1 filled with the fluid substance and cured is also used as the pressure barrier 16. For this reason, even if it is a small diameter catheter tube 2, the inside is reliably obstruct | occluded without a gap | interval compared with the conventional solid pressure barrier. Therefore, a structure suitable for reducing the diameter of the catheter 1 can be obtained. As a result of the pressure barrier 16 preventing the silicone gel 18 from flowing in the direction toward the proximal end of the tube 2, so-called pressure escape in the same direction is prevented. Therefore, the difference between the increase in pressure acting on the piston 7 that is the pressure receiving portion and the increase in pressure of the silicone gel 18 is reduced. Therefore, accurate pressure can be transmitted to the sensor chip 10 as pressure-sensitive means, and sensing sensitivity is improved.
[0034]
(B) In the present embodiment, since the bonding material A1 also serves as the pressure barrier 16 as described above, the number of parts can be reduced, and the cost can be reduced.
[0035]
(C) In this catheter 1, a sensor assembly 3 including an inner tube 5 and an outer tube 4 which are separately prepared in advance is used. Therefore, the desired catheter 1 can be obtained simply by fitting the sensor assembly 3 to the distal end side of the existing catheter tube 2. For this reason, unlike the conventional case where each element constituting the sensor unit is directly incorporated in the catheter tube 2, the catheter 1 can be easily manufactured.
[0036]
(D) In this embodiment, an extremely small semiconductor pressure sensor chip 10 is used as the pressure sensing means. For this reason, it is possible to reduce the diameter of the sensor assembly 3 itself and to withstand practical use as compared with the case where other pressure-sensitive methods are employed. Further, since the notch 9 is provided on the distal end side of the inner tube 5, the sensor chip 10 mounted on the pedestal 11 is relatively easily fixed to the inner tube 5 using the bonding material A1. be able to. Therefore, the catheter 1 can be easily manufactured.
[0037]
(E) The bonding material A1 used for the catheter 1 is a material having a suitable insulating property called an epoxy resin, whereby the bonding wire 15 is entirely sealed. Therefore, a short circuit in the portion of the bonding wire 15 is avoided and a failure is less likely to occur. Therefore, it can be set as the catheter 1 suitable for use with a biological body.
[0038]
(F) Since the bonding material A1 used in this catheter 1 is a hard epoxy resin compared to other resins, the pressure barrier 16 is also hardened accordingly. For this reason, even when pressure is applied, deformation hardly occurs. Therefore, the escape of pressure toward the proximal end of the tube 2 is more reliably prevented, and accurate pressure can be transmitted to the sensor chip 10. This contributes to further improvement in sensing sensitivity. Further, since the bonding material A1 is made of a biocompatible material called epoxy resin, it is possible to realize a catheter having high compatibility with a living body. Therefore, it can be set as the catheter 1 suitable for use with a biological body.
[0039]
(G) In this catheter 1, members 4, 7, and 8 exposed to the outside of the sensor assembly 3 are formed of a biocompatible material. For this reason, even if the sensor assembly 3 may come into contact with an in-vivo substance such as blood, a thrombus or the like is not caused in the blood vessel. Therefore, this catheter 1 has high compatibility with a living body and is suitable for use in a living body.
[0040]
In addition, this invention is not limited only to said embodiment, For example, it can change as follows.
(1) The sensor assembly 32 of the catheter 31 of Example 1 shown in FIG. 4A has a structure in which the outer tube 4 is omitted from the sensor assembly 3 of the embodiment. The inner tube 5 as a tube member constituting the sensor assembly 32 is fitted so as to be completely inserted into the existing catheter tube 2. A pressure barrier 16 is formed in the inner tube 5 by the same bonding material A1 as in the embodiment. The piston 7 seals the opening on the distal end side of the catheter tube 2. Even in such another example 1, the catheter 31 with a sensor mechanism having a high sensing accuracy and a structure suitable for reducing the diameter is obtained. Further, the structure can be simplified as much as the outer tube 4 becomes unnecessary, and the catheter 31 can be further reduced in diameter.
[0041]
(2) In the catheter 41 of Example 2 shown in FIG. 4B, the sensor unit 42 is configured without using any tube member. That is, the pedestal 11 and the sensor chip 10 are arranged directly in the existing catheter tube 2, and the pressure barrier 16 is formed inside by the same bonding material A1 as in the embodiment and the other example 1. Even in such a second example, the catheter 41 with a sensor mechanism having a structure excellent in sensing accuracy and suitable for reducing the diameter to some extent can be obtained.
[0042]
(3) The bonding material A1 is acceptable even if it does not satisfy all three requirements of a) made of an insulating material, b) hard, and c) made of a biocompatible material. The For example, it may satisfy only two requirements, a and b, a and c, or b and c. Furthermore, even if only a, b, and c are satisfied, it can be used to some extent.
[0043]
(4) Instead of the silicone gel 18 as the pressure transmission medium, a gel-like substance other than silicone may be selected, and a fluid substance such as silicone oil may be used. Note that it is more preferable to select a gel-like substance such as the silicone gel 18 in view of the fact that the “dancing” phenomenon hardly occurs in the so-called medium.
[0044]
(5) Instead of the retaining groove 6, the retaining may be achieved by forming an uneven structure such as a protrusion.
Here, in addition to the technical ideas described in the claims, the technical ideas grasped by the above-described embodiments are listed below together with their effects.
[0045]
(1) The catheter with a sensor mechanism according to any one of claims 1 to 5, wherein the bonding material is an epoxy resin. With this configuration, it is possible to realize a catheter with a sensor mechanism that has a high sensing accuracy and is suitable for reducing the diameter, and that is easy to manufacture and does not easily fail, and is suitable for use in a living body.
[0046]
(2) The catheter with a sensor mechanism according to any one of claims 2 to 5, wherein the tube member is fitted so as to be completely inserted into the catheter tube. With this configuration, it is possible to simplify the structure and further reduce the diameter of the catheter.
[0047]
(3) A sensor assembly for a catheter with a sensor mechanism that has a pressure receiving portion, a pressure transmission medium, and pressure-sensitive means, and is disposed on the distal end side of the catheter tube and detects pressure fluctuation, wherein the sensor portion is the catheter A bonding material that includes a tube member that is formed as a separate body from the tube and that is fitted to the distal end side of the catheter tube, and that fixes the pressure-sensitive means within the tube member is a fluid sealing material A sensor assembly for a catheter with a sensor mechanism, which is filled and cured, and also serves as a pressure barrier that prevents the pressure transmission medium from flowing toward the tube proximal end side. By using this sensor assembly, the superior catheter of the present invention can be reliably and easily manufactured.
[0048]
The technical terms used in this specification are defined as follows.
“Biocompatible materials: refers to materials with low reactivity with blood, body fluids, lymph fluids, and other in-vivo substances, such as resins such as silicone resin and polyvinyl chloride, metals such as stainless steel and gold, alumina and zirconia There are ceramics. "
[0049]
【The invention's effect】
As described in detail above, according to the first to fifth aspects of the invention, it is possible to provide a catheter with a sensor mechanism having a high sensing accuracy and a structure suitable for reducing the diameter. Further, according to the present invention, the number of parts can be reduced and the cost can be reduced.
[0050]
According to the second aspect of the present invention, unlike the conventional case where each element constituting the sensor unit is directly incorporated in the catheter tube, a catheter that can be easily manufactured can be provided.
[0051]
According to the third aspect of the invention, the diameter can be reduced and the practicality can be improved, and the catheter can be easily manufactured.
According to invention of Claim 4, it can be set as the catheter suitable for use with the biological body which a failure does not occur easily.
[0052]
According to the fifth aspect of the present invention, it is possible to realize a catheter suitable for use in a living body because sensing sensitivity is further improved and biocompatibility is high.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an outer tube and a piston constituting a sensor assembly for a blood vessel catheter embodying the present invention.
FIG. 2 is a perspective view showing an inner tube, a pedestal, a sensor chip, and the like that also constitute a sensor assembly.
3A is a cross-sectional view of the distal end portion of the catheter, FIG. 3B is a cross-sectional view taken along line AA in FIG. 3A, and FIG. 3C is a cross-sectional view taken along line BB in FIG.
4A is a cross-sectional view showing a distal end portion of a catheter of another example 1, and FIG. 4B is a cross-sectional view showing a distal end portion of the catheter of another example 2. FIG.
FIG. 5 is a cross-sectional view showing a distal end portion of a conventional catheter.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1,31,41 ... Catheter with sensor mechanism, 2 ... Catheter tube, 3, 32 ... Sensor assembly as sensor part, 4 ... Outer tube as tube member, 5 ... Inner tube as tube member, 7 ... As pressure receiving part 9 ... Notch part, 10 ... Semiconductor pressure sensor chip as pressure sensing means, 11 ... Base, 15 ... Bonding wire, 16 ... Pressure barrier, 18 ... Silicone gel as pressure transmission medium, 42 ... Sensor part , A1 ... bonding material.

Claims (5)

In the catheter with the sensor mechanism in which the sensor part having the pressure receiving part, the pressure transmission medium, and the pressure sensing means is arranged on the distal end side of the catheter tube, and the pressure fluctuation is detected by the sensor part.
The bonding material that fixes the pressure-sensitive means in the sensor part is filled with a fluid substance and hardened, and a pressure barrier that prevents the pressure transmission medium from flowing toward the tube base end side. A catheter with a sensor mechanism. The sensor section includes a tube member that is formed separately from the catheter tube and is fitted to the distal end side of the catheter tube, and the pressure-sensitive means is fixed to the inner wall surface of the tube member by the bonding material. The catheter with a sensor mechanism according to claim 1, wherein the bonding material seals the through hole of the tube member in a non-penetrating state. The pressure-sensitive means is a semiconductor pressure sensor chip, and the sensor chip is fixed to a notch provided on the distal end side of the tube member in a state of being placed on a pedestal. 3. A catheter with a sensor mechanism according to 2. The catheter with a sensor mechanism according to claim 3, wherein the bonding material is made of an insulating material and seals at least the bonding wire drawn out from the sensor chip. The catheter with a sensor mechanism according to any one of claims 1 to 4, wherein the bonding material is made of a hard and biocompatible material.

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