Venous catheter

Abstract

The utility model discloses a venous catheter which comprises an infusion tube and a temperature measuring cavity, an isolating layer is arranged on the outer side of the infusion tube, the temperature measuring cavity is arranged on the outer side of the isolating layer, the temperature measuring cavity is provided with a temperature measuring guide wire, and the temperature measuring guide wire can be reversely folded in the temperature measuring cavity. The temperature measuring probe connected with the temperature measuring guide wire can move in the direction pointing to the tail end of the temperature measuring guide wire, and the isolating layer is used for at least partially isolating the influence of the temperature of infusion liquid in the infusion tube on the temperature measuring probe. According to the utility model, the accurate measurement of the temperature of the target organ to be measured, such as the accurate measurement of the brain parenchyma temperature, can be realized through the reflexed structure and the isolation layer.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical equipment, and in particular relates to a venous catheter. Background Art

[0002] Many surgical procedures require lowering the temperature of organs to mitigate damage to their function. Therefore, accurate measurement of organ temperature is necessary to control the applied hypothermia.

[0003] Taking cardiac and vascular surgery as an example, during surgery, the brain temperature needs to be lowered to reduce the damage to brain function caused by ischemia and hypoxia. This means that accurately measuring brain temperature is crucial for precisely controlling the extent of hypothermia during surgery, thereby avoiding damage to brain function caused by excessive or insufficient cooling. Since direct measurement of brain parenchymal temperature is difficult to achieve in actual operations, the temperature of other body parts is often used in clinical practice to replace brain parenchymal temperature. Among them, nasopharyngeal temperature and rectal temperature are commonly used in clinical practice, but their accuracy is questionable. Jugular vein temperature is considered an ideal substitute for brain parenchymal temperature.

[0004] However, taking the measurement of jugular vein temperature as an example, the internal jugular vein blood temperature measured by the central venous catheter in the prior art is inevitably affected by the temperature of the infused liquid, such as the medication, resulting in inaccurate temperature measurement. At the same time, the measurement position of the central venous catheter in the prior art is far away from the brain, and the accuracy of the measured internal jugular vein blood temperature remains a problem.

[0005] The above information disclosed in the background technology section is only used to enhance understanding of the background of the present invention and therefore may contain information that does not constitute the prior art known to ordinary technicians in this field. Utility Model Content

[0006] In view of the deficiencies of the prior art, the purpose of the present invention is to provide a venous catheter to achieve accurate measurement of the temperature of a target organ to be measured, such as brain parenchyma temperature.

[0007] To achieve the above objectives, the present invention provides the following technical solutions:

[0008] An intravenous catheter comprising:

[0009] Infusion tube and temperature measurement cavity, wherein,

[0010] There is an isolation layer on the outside of the infusion tube.

[0011] There is a temperature measuring cavity on the outside of the isolation layer.

[0012] The temperature measuring cavity is equipped with a temperature measuring wire, wherein the temperature measuring wire can be folded back in the temperature measuring cavity, and the temperature measuring probe connected to the temperature measuring wire can move in the direction pointing to the tail end of the temperature measuring wire.

[0013] The isolation layer is used to at least partially isolate the influence of the temperature of the infusion liquid in the infusion tube on the temperature measuring probe;

[0014] in,

[0015] When the temperature measuring wire is bent back in the temperature measuring cavity, the temperature measuring wire can change its movement direction in the temperature measuring cavity;

[0016] The temperature measuring guide wire has flexibility and resilience;

[0017] The surface of the temperature measuring guide wire has an anti-coagulation coating;

[0018] The corresponding second cavity part of the temperature measuring cavity in the tail of the intravenous catheter is not on the same straight line as the corresponding first cavity part of the temperature measuring cavity in the middle section of the catheter. There is an obtuse angle between the first cavity part of the temperature measuring cavity and the second cavity part.

[0019] Preferably,

[0020] The infusion tube is used for infusing liquid along a first direction.

[0021] Preferably,

[0022] The temperature measuring probe connected to the temperature measuring wire has the ability to move in a second direction opposite to the first direction in the temperature measuring cavity.

[0023] Preferably,

[0024] The inverted structure comprises a first section and a second section of the temperature measuring guide wire, and the second section of the temperature measuring guide wire where the temperature measuring probe is located is located outside the first section of the temperature measuring guide wire.

[0025] Preferably,

[0026] The second section of the temperature measuring guide wire where the temperature measuring probe is located is further away from the infusion tube than the first section of the temperature measuring guide wire.

[0027] Preferably,

[0028] The intravenous catheter also includes a catheter front end,

[0029] The infusion tube is used for infusing liquid along a first direction toward the front end of the catheter.

[0030] Preferably,

[0031] The front end of the temperature measuring cavity is located outside the middle section of the catheter.

[0032] The tail end of the catheter is closer to the front end of the catheter than the tail end of the temperature measuring cavity.

[0033] Compared with existing technologies, the present invention offers the following advantages: the inverted structure of the temperature-measuring guidewire of the intravenous catheter disclosed herein enables the movement of the temperature-measuring probe in the opposite direction of the infusion liquid in the infusion tube. During continuous infusion, the intravenous catheter minimizes the negative impact of the infusion tube's temperature on temperature measurement. Furthermore, the design of the isolation layer further minimizes the negative impact of the infusion tube's temperature on temperature measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Various other advantages and benefits of the present invention will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are intended only to illustrate preferred embodiments and are not intended to limit the present invention. Obviously, the drawings described below are merely examples of the present invention, and those skilled in the art will be able to derive other drawings based on these drawings without inventive effort. Throughout the drawings, identical reference numerals are used to represent identical components.

[0035] Figure 1 is a schematic diagram of a venous catheter disclosed in one embodiment of the present utility model;

[0036] Figure 2 yes Figure 1 A partial enlarged schematic diagram of the venous catheter is shown;

[0037] Figure 3 This is a schematic diagram of an application of an intravenous catheter disclosed in another embodiment of the present utility model;

[0038] The description of the accompanying drawings is as follows:

[0039] 1. The front end of the catheter,

[0040] 2. Temperature probe,

[0041] 3. Temperature measuring wire,

[0042] 4. Infusion tube,

[0043] 5. Temperature measurement cavity,

[0044] 6. Isolation layer,

[0045] 7. Catheter tail end,

[0046] 8. Pusher for infusion tube. DETAILED DESCRIPTION

[0047] The following will refer to the attached Figures 1 to 3Specific embodiments of the present invention are described in detail. Although specific embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. Rather, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0048] It should be noted that certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that technicians may use different nouns to refer to the same component. This specification and claims do not use the difference in nouns as a way to distinguish components, but use the difference in the functions of the components as the criterion for distinction. For example, "including" or "comprising" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to". The subsequent description of the specification is a preferred embodiment of the present invention, but the description is based on the general principles of the specification and is not intended to limit the scope of the present invention. The scope of protection of the present invention shall be determined by the definition of the attached claims.

[0049] To facilitate understanding of the embodiments of the present invention, further explanation will be given below using specific embodiments as examples in conjunction with the accompanying drawings, and the accompanying drawings do not constitute a limitation on the embodiments of the present invention.

[0050] See also Figure 1 、 Figure 2 In one embodiment, the present invention provides a venous catheter, comprising:

[0051] Infusion tube 4 and temperature measurement cavity 5, wherein,

[0052] An isolation layer 6 is provided on the outside of the infusion tube 4.

[0053] A temperature measuring cavity 5 is provided on the outside of the isolation layer 6.

[0054] The temperature measuring cavity 5 is provided with a temperature measuring wire 3, wherein the temperature measuring wire 3 can be folded back in the temperature measuring cavity (see Figure 2 As shown), the temperature measuring probe 2 connected to the temperature measuring wire 3 can move in the direction pointing to the tail end of the temperature measuring wire,

[0055] The isolation layer 6 is used to at least partially isolate the temperature of the infusion liquid in the infusion tube 4 from affecting the temperature measuring probe 2 .

[0056] In the described embodiment, the venous catheter, in which the temperature measuring guidewire 3 is bent within the temperature measuring cavity 5, moves its temperature measuring probe 2 in the opposite direction of the infusion liquid in the infusion tube 4. During the continuous infusion process, the venous catheter minimizes the negative impact of the temperature of the infusion tube 4 on the temperature measurement. Furthermore, the design of the isolation layer 6 further minimizes the negative impact of the temperature of the infusion liquid in the infusion tube 4 on the temperature measurement.

[0057] It should be noted that the isolation layer 6 can be solid or hollow. When the isolation layer 6 is solid, the thermal conductivity of the material used for the isolation layer 6 needs to be relatively low, so as not to be detrimental to heat conduction. When the isolation layer 6 is hollow, the interior of the isolation layer can be air or vacuum, etc., whichever is detrimental to heat conduction.

[0058] In another embodiment,

[0059] The infusion tube 4 is used to infuse liquid along a first direction.

[0060] In another embodiment,

[0061] The temperature measuring probe 2 connected to the temperature measuring wire 3 is capable of moving in a second direction opposite to the first direction within the temperature measuring cavity.

[0062] For the embodiment, the movement direction of the temperature measuring probe 2 connected to the temperature measuring guide wire 3 is essentially toward the tail end of the temperature measuring guide wire, which is opposite to the infusion direction of the infusion liquid in the infusion tube 4. During the continuous infusion of liquid, the intravenous catheter avoids the negative impact of the temperature of the infusion tube 4 on temperature measurement to the greatest extent, such as the negative impact on the temperature measuring probe 2.

[0063] See also Figure 2 In another embodiment,

[0064] When the temperature measuring wire 3 is bent back in the temperature measuring cavity 5, the temperature measuring wire can change its movement direction in the temperature measuring cavity. Further, the temperature measuring probe 2 connected to the temperature measuring wire 3 can move in the direction pointing to the tail end of the temperature measuring wire.

[0065] In another embodiment,

[0066] The inverted structure includes a first section and a second section of the temperature measuring guide wire. The second section of the temperature measuring guide wire where the temperature measuring probe 2 is located is located outside the first section of the temperature measuring guide wire.

[0067] In another embodiment,

[0068] The second section of the temperature measuring guide wire where the temperature measuring probe 2 is located is further away from the infusion tube 4 than the first section of the temperature measuring guide wire.

[0069] In this way, the present invention can avoid the negative impact of the temperature of the infusion tube on temperature measurement as much as possible.

[0070] In another embodiment,

[0071] The intravenous catheter also includes a catheter front end 1,

[0072] The infusion tube 4 is used to infuse liquid along a first direction toward the front end 1 of the catheter.

[0073] In another embodiment,

[0074] The intravenous catheter further comprises a catheter middle section and a catheter tail end 7 .

[0075] Combine Figure 1 、 Figure 2 It can be found that the middle section of the catheter is located between the front end 1 of the catheter and the tail end 7 of the catheter.

[0076] In another embodiment,

[0077] The front end of the temperature measuring cavity 5 is located outside the middle section of the catheter.

[0078] The catheter tail end 7 is closer to the catheter front end 1 than the tail end of the temperature measuring cavity.

[0079] It can be found that the temperature measuring guide wire 3 enters the temperature measuring cavity 5 through the tail end of the temperature measuring cavity.

[0080] See also Figure 1 In another embodiment,

[0081] The distance between the head of the front end of the catheter 1 and the front end of the temperature measuring cavity is d1;

[0082] The distance between the front end of the temperature measuring cavity 5 and the end of the middle section of the catheter is d2. It should be noted that the length of the first section of the temperature measuring guide wire located in the middle section of the catheter is also equal to d2.

[0083] The length of the middle section of the catheter is d3. It should be noted that Figure 1 In the embodiment, the length of the isolation layer 6 is equal to the length of the middle section of the catheter. However, it is not mandatory that the length of the isolation layer must be equal to the length of the middle section of the catheter. It can be understood that the length of the isolation layer should be greater than or equal to d2, so as to effectively isolate the influence of the temperature of the infusion tube on the temperature measurement.

[0084] The length of the front end 1 of the catheter is d4.

[0085] In another embodiment, the above multiple lengths satisfy the following constraints:

[0086] d4 <d1,

[0087] d2 <d3,

[0088] d1 - d4 + d2 = d3。

[0089] It should be noted that d4 < d1 because this can ensure that there is a certain distance between the front end of the temperature measurement cavity and the tail of the front end 1 of the catheter. In this way, in the total length of the temperature measurement guide wire, the length of the first section of the temperature measurement guide wire located in the middle section of the catheter can be made as short as possible, so as to further make the total length d2 of the temperature measurement guide wire as short as possible, facilitating the temperature measurement probe 2 to reach the position of the temperature to be measured in the opposite direction of the front end 1 of the catheter as soon as possible during the application of the venous catheter. It can be understood that the length d2 of the first section of the temperature measurement guide wire located in the middle section of the catheter cannot be too short, otherwise the moving space and the temperature measurement area of the temperature measurement probe 2 will be compressed, which is not conducive to its use.

[0090] Exemplarily,

[0091] d1 = 5 cm,

[0092] The value range of d2 is: 10 to 15 cm,

[0093] d4 and d3 can be appropriately valued according to the above exemplary constraint relationship.

[0094] Thus, in another embodiment, in an extreme case, the front end of the temperature measurement cavity is flush with the tail of the front end 1 of the catheter, and the front end of the temperature measurement cavity 5 is at a distance from the end of the middle section of the catheter. At this time:

[0095] d4 = d1,

[0096] d2 = d3.

[0097] It can be understood that this still makes the venous catheter usable. However, the temperature measurement guide wire will be longer than that in the previous embodiment, and the temperature measurement probe 2 will take more time to reach the position of the temperature to be measured. The beneficial aspect is that the moving space and the temperature measurement area of the temperature measurement probe 2 are significantly widened compared with the previous embodiment.

[0098] See Figure 1 , in another embodiment,

[0099] The tail of the venous catheter is in the shape of a tail fin. The corresponding second cavity part of the temperature measurement cavity 5 in the tail of the venous catheter is not on the same straight line as the corresponding first cavity part of the temperature measurement cavity 5 in the middle section of the catheter. For example, Figure 1 in, the first cavity part and the second cavity part of the temperature measurement cavity 5 form an obtuse angle with each other.

[0100] It can be understood that this design makes the end of the temperature measurement cavity 5, as the entrance of the temperature measurement guide wire 3, be as far as possible laterally away from the pusher 8 of the infusion tube 4.

[0101] In another embodiment,

[0102] When the isolation layer 6 is located between the infusion tube 4 and the temperature measuring cavity 5 and the temperature measuring cavity 5 is located outside the infusion tube 4 and the isolation layer 6 respectively, the isolation layer 6 is adjacent to the outer edge of the infusion tube.

[0103] In another embodiment,

[0104] The temperature measuring cavity 5 and the isolation layer 6 are not adjacent to each other.

[0105] In this way, the negative impact of the temperature of the infusion tube 4 on temperature measurement can be avoided to the greatest extent.

[0106] See further Figure 2 In another embodiment,

[0107] In the direction from the infusion tube to the temperature measuring chamber, the second cavity portion of the temperature measuring chamber 5 includes a first wall 5a close to the infusion tube and a second wall 5b away from the infusion tube;

[0108] In the direction from the infusion tube to the temperature measuring cavity, the first cavity portion of the temperature measuring cavity 5 includes a first wall 5a close to the infusion tube, a second wall 5b away from the infusion tube, and a third wall 5c located at the front end of the temperature measuring cavity and farthest from the infusion tube, wherein the third wall 5c is formed by bending the first wall 5a at the front end of the temperature measuring cavity toward the outside of the intravenous catheter.

[0109] Furthermore, at the front end of the temperature measuring cavity, the temperature measuring probe 2 is folded outward from the space between the first wall 5a and the second wall 5b, and extends through the space between the second wall 5b and the third wall 5c.

[0110] In another embodiment,

[0111] The diameter of the middle section of the intravenous catheter is 2-3 mm.

[0112] The radial dimension between the first wall 5a and the second wall 5b of the temperature measurement cavity is 0.1 mm.

[0113] For example,

[0114] The radial dimension between the second wall 5b and the third wall 5c of the temperature measuring cavity is 0.1 mm.

[0115] In another embodiment,

[0116] The surface of the temperature measuring guide wire 3 has an anti-coagulation coating.

[0117] In this way, when the intravenous catheter is used, thrombosis in the blood vessel is avoided to the greatest extent.

[0118] See also Figure 3, which illustrates the application of the intravenous catheter in measuring brain parenchymal temperature. It shows the intravenous catheter and the pusher of the infusion tube, but does not show the other components of the intravenous catheter. It can be understood that the temperature probe is on the inside of the blood vessel, and the temperature guide wire at the tail end of the intravenous catheter is pushed downward as much as possible to make the temperature probe move upward to more accurately measure the blood temperature of the internal jugular vein close to the brain, thereby achieving the measurement of brain parenchymal temperature.

[0119] Specifically, the application of the intravenous catheter in measuring brain parenchymal temperature includes the following steps:

[0120] The catheter tip of the intravenous catheter is pointed downward, and the side of the temperature probe is inserted into the internal jugular vein along the midline of the neck (see Figure 3 ), after being punctured into a certain position and fixed, the tail end of the catheter is located on the surface of the neck, wherein the intravenous catheter infuses the liquid of the medicine into the internal jugular vein through the infusion tube, and the temperature measuring probe and temperature measuring guide wire are sent into the tail end of the temperature measuring cavity,

[0121] The temperature measuring guide wire is folded back through the temperature measuring cavity and then moves upward along the internal jugular vein, while ultrasound positioning is performed on the neck. During the use of the intravenous catheter, the position of the temperature measuring probe can be adjusted in real time so that the temperature measuring probe can be placed in a suitable position for temperature measurement.

[0122] It is understood that the intravenous catheter is not limited to measuring brain parenchymal temperature. Furthermore, the temperature guidewire itself is extremely thin and flexible, so it will not bend when bent back in the temperature measurement cavity. Furthermore, the temperature guidewire has a certain degree of resilience, so that after the temperature probe extends from the front end of the temperature measurement cavity and enters the internal jugular vein, the temperature probe maintains a certain degree of shape. At the same time, neck ultrasound positioning can further ensure the smooth delivery of the temperature guidewire in the internal jugular vein. After the operation, the temperature probe and temperature guidewire can be removed from the temperature measurement cavity to prevent any impact on the corresponding intravenous catheterization and infusion after the operation.

[0123] Although the embodiments of the present invention are described above in conjunction with the accompanying drawings, the present invention is not limited to the above-mentioned specific embodiments and application fields. The above-mentioned specific embodiments are merely illustrative and instructive, and not restrictive. A person skilled in the art, under the guidance of this specification and without departing from the scope of protection of the claims of the present invention, can also make many forms, all of which fall within the scope of protection of the present invention.

Claims

1. A venous catheter, characterized in that: include: Infusion tube and temperature measurement cavity, wherein, There is an isolation layer on the outside of the infusion tube. There is a temperature measuring cavity on the outside of the isolation layer. The temperature measuring cavity is equipped with a temperature measuring wire, wherein the temperature measuring wire can be folded back in the temperature measuring cavity, and the temperature measuring probe connected to the temperature measuring wire can move in the direction pointing to the tail end of the temperature measuring wire. The isolation layer is used to at least partially isolate the influence of the temperature of the infusion liquid in the infusion tube on the temperature measuring probe; in, When the temperature measuring wire is bent back in the temperature measuring cavity, the temperature measuring wire can change its movement direction in the temperature measuring cavity; The temperature measuring guide wire has flexibility and resilience; The surface of the temperature measuring guide wire has an anti-coagulation coating; The corresponding second cavity part of the temperature measuring cavity in the tail of the intravenous catheter is not on the same straight line as the corresponding first cavity part of the temperature measuring cavity in the middle section of the catheter. There is an obtuse angle between the first cavity part of the temperature measuring cavity and the second cavity part.

2. The intravenous catheter according to claim 1, characterized in that The infusion tube is used for infusing liquid along a first direction.

3. The intravenous catheter according to claim 2, characterized in that The temperature measuring probe connected to the temperature measuring wire has the ability to move in a second direction opposite to the first direction in the temperature measuring cavity.

4. The intravenous catheter according to claim 1, characterized in that The inverted structure comprises a first section and a second section of the temperature measuring guide wire, and the second section of the temperature measuring guide wire where the temperature measuring probe is located is located outside the first section of the temperature measuring guide wire.

5. The intravenous catheter according to claim 4, characterized in that The second section of the temperature measuring guide wire where the temperature measuring probe is located is further away from the infusion tube than the first section of the temperature measuring guide wire.

6. The intravenous catheter according to claim 1, characterized in that The intravenous catheter also includes a catheter front end, The infusion tube is used for infusing liquid along a first direction toward the front end of the catheter.

7. The intravenous catheter according to claim 6, characterized in that The front end of the temperature measuring cavity is located outside the middle section of the catheter. The tail end of the catheter is closer to the front end of the catheter than the tail end of the temperature measuring cavity.

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