JP2004024667A - Comb hemostatic apparatus using shape memory material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hemostatic apparatus simultaneously stopping bleeding at a plurality of sites by utilizing a characteristic of a shape memory material which varies its shape according to a temperature. <P>SOLUTION: The shape memory material in which a shape memory function of changing a low-temperature-side length L<SB>1</SB>to a high-temperature-side length L<SB>2</SB>after phase transformation is generated is used for a needle support part 11, and a plurality of hemostatic needles 12 are fixed to the needle support part 11. When the hemostatic needles 12 are inserted to blood vessels inside of an internal organ and when this comb hemostatic apparatus 10 is heated by heat of internal organ, a plurality of blood vessels are batch pressed and blood-stopped by the hemostatic needles 12 whose adjacent intervals are narrowed from P<SB>1</SB>to P<SB>2</SB>. Hemostatic needle in which a shape memory function of releasing a twisted state on the low-temperature-side by the phase transformation is generated can be used. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
[Industrial applications]
The present invention relates to a hemostatic device that can collectively stop a plurality of blood vessels by utilizing the shape restoring action of a shape memory material.
[0002]
[Prior art and problems]
In order to stop the bleeding of the isolated blood vessel, a method of mechanically compressing the blood vessel by clipping or ligating to stop the bleeding or a method of physically coagulating the blood vessel by bipolar coagulation, ultrasonic coagulation, laser coagulation, etc. are employed. ing. However, a large number of blood vessels are dissected in an operation to dissect a tumor such as a liver or a kidney, which is a relatively large organ, so that it takes a lot of time and effort for repeated hemostatic work.
[0003]
Much time and effort puts a great burden on both the patient and the physician. As a result, it is a difficult and dangerous operation to isolate a patient's organ that cannot withstand long-term surgery, which is expected to cause massive bleeding, using current hemostatic techniques. With conventional hemostatic techniques, it is also very difficult to stop bleeding but not exposing blood vessels to the surface. According to the method of stopping blood by physical coagulation, it is possible to stop blood vessels not exposed on the surface, but it requires an expensive coagulation apparatus and causes high medical expenses.
[0004]
[Means for Solving the Problems]
The present invention has been devised to solve such a problem. By utilizing the characteristics of a shape memory material that changes its shape in accordance with temperature, it is possible to quickly and easily bind a plurality of blood vessels. It is intended to provide a hemostatic device.
[0005]
In order to achieve the object, the present invention provides a comb-shaped hemostatic device in which a plurality of hemostatic needles are fixed to a needle support, wherein the phase transformation or glass transition of the shape memory material is changed by changing the length of the needle support or the hemostatic needle. It is expressed as a shape change. When the adjacent gap between the hemostatic needles is narrowed by changing the length of the needle support, a shape memory function is provided in which the length on the high-temperature side after the phase transformation or glass transition is shorter than the length on the low-temperature side. When the adjacent gap is narrowed by changing the shape of the hemostatic needle, a shape memory function is provided in which the twisted state provided on the low temperature side is released by the phase transformation or glass transition. In any case, a shape memory material whose phase transformation temperature or glass transition temperature is adjusted between storage temperature and normal body temperature is used.
[0006]
Embodiment
The shape memory material is a material that repeats a shape change between a low temperature side and a high temperature side by a phase transformation or a glass transition triggered by temperature. A Ni—Ti alloy, which is a typical shape memory material, has excellent biocompatibility and has a track record as a biomaterial. However, it goes without saying that other alloys or synthetic resins can be used instead of the Ni-Ti alloy as long as they exhibit the shape memory function.
[0007]
When a Ni-Ti alloy is used for the shape memory material, the phase transformation temperature (operating temperature) can be adjusted by the mixing ratio of Ni and Ti. Therefore, it is possible to use a Ni—Ti alloy whose phase transformation temperature is adjusted according to the temperature state of the organ such as a frozen state. Even when a shape memory material other than a Ni-Ti alloy is used, the phase transformation temperature or glass transition temperature is adjusted to a temperature necessary for hemostasis by the same component ratio, molecular weight, molecular structure, and the like.
[0008]
The shape memory material is incorporated in a comb-shaped hemostatic device as a wire, a plate, or the like.
In the comb-shaped hemostatic device 10 of FIG. 1, a needle support 11 is made of a shape memory material, and a plurality of hemostatic needles 12 are fixed to the needle support 11. Needle support 11, the low temperature side of the length L shape memory function as ₁ length L ₂ after to phase transformation or after the glass transition compared to shorter is fabricated. Holding the comb hemostatic device 10 to a high temperature, needle support 11 by phase transformation or glass transition is a high temperature side length L _2, narrower distance between the adjacent hemostatic needle 12 and p ₁ → p _2.
[0009]
Prior to hemostasis, the comb-shaped hemostatic device 10 is stored at a temperature lower than the phase transformation temperature (for example, 0 ° C.). Comb hemostatic device 10 that are stored, the needle support 11 has become a low-temperature side length L _1, the adjacent spacing p ₁ hemostatic needle 12 is wider than the vessel hemostasis target. In this state, the hemostatic needle 12 is inserted between the blood vessels b ₁ , b _2, ..., B _n inside the organ A (FIG. 2, left). In FIG. 2, in order to clearly show the positional relationship between the blood vessel b _1, b ₂ ···· b _n and hemostasis needle 12, are omitted organ A to dissection plane from hemostasis surface S.
[0010]
The comb-shaped hemostatic device 10 having the hemostatic needle 12 inserted between the blood vessels b ₁ , b _2, ... B _n is heated by the heat from the organ A. When the temperature of the comb-shaped hemostatic device 10 exceeds the phase transformation temperature, needle support 11 is shortened to a high temperature side length L ₂ by phase transformation. Distance between the adjacent hemostatic needle 12 by shortening the needle support 11 p ₂ also narrowed. Therefore, a plurality of blood vessels b ₁ , b _2, ..., B _n inside the organ A are simultaneously compressed between the hemostatic needles 12 (right in FIG. 2). Therefore, a plurality of blood vessels b ₁ , b _2, ..., B _n can be simultaneously stopped by a simple operation, and the time required for the stop is greatly reduced.
[0011]
The hemostasis work using a comb-like hemostatic device 10, the vessel b ₁ hemostasis needle 12 narrows the distance between the adjacent hemostatic needle 12 by phase transformation or glass transition after insertion into an organ _A, b ₂ · · · · b _n is pressed directly. Therefore, even in vessels b ₂ inside the organ A than the separating surface, likewise insert the hemostasis needle 12 in the affected area, it hemostasis in a simple operation procedure for phase transformation in the heat from the organ A.
[0012]
The blood vessels b ₁ , b _2, ..., B _n are pressed by the hemostatic needle 12 even if the organ A returns to normal body temperature (37 ° C.). Specifically, if the phase transformation temperature of the Ni—Ti alloy used for the needle support 11 is set between the storage temperature and the normal body temperature, the organ A does not drop below the phase transformation temperature after hemostasis. since, it maintained the high temperature side length _{L 2} of the needle support 11, hemostasis vascular _{b 1, b} 2 _{···· b n} is compressed between the narrow distance between the adjacent _{p 2} hemostatic needle 12 persists .
[0013]
The hemostatic needle itself can be made of a shape memory material (FIG. 3). In this comb-shaped hemostatic device 20, the needle support 21 is made of a material having no shape memory function, and the hemostatic needle 22 formed by twisting the shape memory material is fixed to the needle support 21. When the comb-shaped hemostatic device 20 is heated to a high temperature, the shape of the needle support 21 does not change, but the hemostatic needle 22 is released from the twisted state and changes to a flat shape. As a result, the blood vessels b ₁ , b _2, ..., B _n are pressed by the hemostatic needle 22 in which the distance between the adjacent hemostatic needles 22 is reduced, and the blood is stopped.
Accordance with the shape change of the hemostatic needle 22, it is also possible to use needle support 21 which is the high temperature side length L ₂ after transformation as in the case of FIG. 1 is shortened. When the shape changes of the needle support 21 and the hemostatic needle 22 are used together, the compression force necessary for hemostasis can be easily obtained.
[0014]
The ligature itself utilizing the shape change due to the phase transformation of the shape memory material is introduced in JP-A-62-34555 and JP-A-62-34556, all of which are intended for hemostasis of one blood vessel. I have to. On the other hand, in the comb-shaped hemostatic devices 10 and 20 of the present invention, since a plurality of hemostatic needles 12 and 22 are fixed to the needle support portions 11 and 21, hemostasis of a plurality of blood vessels can be simultaneously performed. That is, the hemostatic needles 12 and 22 are inserted into predetermined locations of the blood vessels b ₁ , b _2, ... B _n inside the organ A, and the heat of the organ A causes the comb-shaped hemostatic instruments 10 and 20 to reach the phase transformation temperature or interval hemostatic needles 12 and 22 when heated above the glass transition temperature narrows and _{p 1} → _{p 2,} vascular _{b 1, b} 2 _{···· b n} is squeezed hemostasis. Since the phase transformation or glass transition of the shape memory material using temperature as an operation trigger is used, a wide affected area including as many as 10 to 20 blood vessels can be collectively stopped using a plurality of hemostatic needles 12 and 22, and the hemostatic work can be performed. Finish in a short time.
[0015]
【The invention's effect】
As described above, the comb-shaped hemostatic device of the present invention utilizes the characteristics of the shape memory material that changes its shape in accordance with the temperature, and allows the plurality of hemostatic needles fixed to the needle supporting portion to have a gap required for hemostasis. Down to Since the adjacent gaps between the hemostatic needles are simultaneously narrowed, for example, about 10 to 20 blood vessels can be collectively stopped, and the burden on the patient and the doctor is greatly reduced, and the time required for the hemostatic operation is greatly reduced. As a result, it is possible to perform a resection operation even for a patient who cannot endure a long operation. In addition, since a shape memory function that does not require external energy is used, expensive devices such as lasers and ultrasonic waves are not required, and the operation cost can be significantly reduced.
[Brief description of the drawings]
FIG. 1 is a comb-shaped hemostatic device using a shape memory material for a needle support portion. FIG. 2 is an explanatory view of a hemostatic operation using the comb-shaped hemostatic device. FIG. 3 is a comb shape using a shape memory material for a hemostatic needle. Hemostatic device [Explanation of symbols]
10, 20: comb-shaped hemostatic device 11: needle support (made of shape memory material) 21: needle support 12: hemostatic needle 22: hemostatic needle (made of shape memory material)
L ₁ : low-temperature length of the needle support L ₂ : high-temperature length of the needle support p ₁ : interval between adjacent hemostatic needles p ₂ : adjacent interval between hemostatic needles A: organ S: hemostatic surface inside the organ b ₁ , B ₂ ... B _n : blood vessels inside the organ

Claims (2)

A plurality of hemostatic needles are fixed to a shape memory material needle support part whose phase transformation temperature or glass transition temperature is adjusted between storage temperature and normal body temperature and whose length becomes short after phase transformation or glass transition. A comb-shaped hemostatic device using a shape memory material. A plurality of hemostatic needles made of a shape memory material provided with a shape memory function in which the phase transformation temperature or glass transition temperature is adjusted between the storage temperature and the normal body temperature, and the twisted state on the low temperature side is released on the high temperature side and becomes flat. Wherein the hemostatic needle is fixed to a needle supporting portion, wherein a comb-shaped hemostatic device using a shape memory material is provided.

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