CN221731797U - A drainage catheter for multimodal intracranial monitoring - Google Patents

Abstract

The utility model provides a multimodal drainage catheter for intracranial monitoring, including a tube body, one end of which is open and the other end of which is blocked by a plug. The tube body is a double-lumen catheter, and the two chambers of the tube body are respectively a drainage cavity and a monitoring cavity. A drainage hole is provided on the wall of the drainage cavity near the plug, and a monitoring hole is provided on the wall of the monitoring cavity near the plug. A temperature-pressure sensor element is fixed in the monitoring cavity corresponding to the monitoring hole, which is used to monitor intracranial pressure and intracranial temperature; an optical fiber is provided in the monitoring cavity, and one end of the optical fiber covered with a fluorescent film penetrates into the drainage cavity along a penetration path, which is used to monitor oxygen partial pressure. The utility model can realize simultaneous monitoring of intracranial pressure, intracranial temperature and brain tissue oxygen partial pressure while draining cerebrospinal fluid, thereby improving the correlation between the data of each indicator and enabling a more accurate assessment of the condition.

Description

A drainage catheter for multimodal intracranial monitoring

Technical Field

The utility model relates to the technical field of medical devices, in particular to a drainage catheter for multi-modal intracranial monitoring.

Background Art

Cranial drainage surgery is mainly used for emergency treatment of diseases with increased intracranial pressure, such as intracranial injury and hydrocephalus. During the drainage surgery, intracranial pressure (ICP), intracranial temperature (ICT) and brain tissue oxygen partial pressure (PtiO ₂ ) are important indicators for monitoring patients with severe craniocerebral injury.

At present, drainage tubes that can simultaneously monitor intracranial pressure and intracranial temperature during drainage have been developed on the market, such as patent CN201110162589.1 which discloses an intracranial pressure monitoring drainage tube, which includes an intracranial pressure monitoring probe and a drainage tube. The front end of the drainage tube is sealed with a silicone head, and a drainage fluid port is provided on the side of the drainage tube. The intracranial pressure monitoring probe is embedded in the front end of the drainage tube. A thermocouple is also provided in the silicone head at the front end of the drainage tube. The intracranial pressure and intracranial temperature are monitored by the thermocouple and the intracranial pressure monitoring probe.

However, when using the above-mentioned drainage tube, a separate monitoring catheter probe must be placed under the cerebral cortex to monitor the oxygen partial pressure of brain tissue. The secondary catheterization increases the patient's pain and surgical costs. At the same time, there is an error between the monitored local brain tissue oxygen metabolism status and the position of cranial drainage. As the monitoring time increases, the influence of the intracranial environment will aggravate the inaccuracy of the above-mentioned monitoring results. Due to the mutual constraints between various indicators, some patients cannot be accurately evaluated.

Utility Model Content

In order to address the deficiencies of the above-mentioned prior art, the utility model provides a multimodal drainage catheter for intracranial monitoring, which can realize cerebrospinal fluid drainage and simultaneous monitoring of intracranial pressure, intracranial temperature and brain tissue oxygen partial pressure, thereby improving the correlation between various indicator data and enabling a more accurate assessment of the condition.

The technical solution of the utility model is: a multimodal drainage catheter for intracranial monitoring, comprising a tube body, one end of the tube body is open, and the other end of the tube body is blocked by a plug, the tube body is a double-lumen catheter, the two chambers of the tube body are respectively a drainage cavity and a monitoring cavity, a drainage hole is provided on the tube wall of the drainage cavity close to the plug, and a monitoring hole is provided on the tube wall of the monitoring cavity close to the plug, a temperature-pressure sensor element is fixed in the monitoring cavity corresponding to the monitoring hole, and is used to monitor intracranial pressure and intracranial temperature; an optical fiber is provided in the monitoring cavity, and one end of the optical fiber covered with a fluorescent film penetrates into the drainage cavity along a penetration path, and is used to monitor the oxygen partial pressure. By inserting an optical fiber covered with a fluorescent film into the drainage cavity, the oxygen partial pressure of the cerebrospinal fluid drained in the drainage cavity is monitored by using the principle of fluorescence quenching. At the same time, the temperature-pressure sensor element in the cavity is monitored to monitor the intracranial pressure and intracranial temperature. It is possible to achieve simultaneous monitoring of the above three indicators while draining with one drainage catheter to ensure the correlation between the data. Most of the optical fiber is located in the monitoring cavity, and only the end used to sense the oxygen partial pressure is located in the drainage cavity, which ensures that there is sufficient drainage space in the drainage cavity and the drainage efficiency is guaranteed.

The temperature-pressure sensing element includes a thermocouple, a pressure sensor and a probe shell for wrapping the thermocouple and the pressure sensor. The probe shell is glue-sealed and fixed in the monitoring cavity. A pressure measuring window is provided on the probe shell. The sensing surface of the pressure sensor corresponds to the monitoring hole through the pressure measuring window.

The optical fiber is a double optical fiber, including an incident optical fiber for irradiating excitation light to the fluorescent film and an output optical fiber for receiving fluorescence excited by the fluorescent film.

A through hole is provided on the tube wall between the drainage cavity and the monitoring cavity, the through hole forms the through path, the optical fiber is sealed and connected to the through hole, and one end of the optical fiber covered with a fluorescent film extends and is fixed at a distal position of the tube wall corresponding to the drainage hole. One end of the optical fiber sensing the oxygen partial pressure is located at a position corresponding to the drainage hole, so that the monitoring position of the oxygen partial pressure is close to the monitoring position of the temperature-pressure sensor element, thereby improving the consistency of monitoring.

A U-shaped channel connecting the drainage cavity and the monitoring cavity is provided in the plug, the U-shaped channel forms the penetration path, the optical fiber is sealed and connected to the U-shaped channel, and one end of the optical fiber covered with a fluorescent film extends and is fixed to the proximal position of the tube wall corresponding to the drainage hole. The optical fiber penetrates into the drainage cavity through the plug, which can minimize the space occupied by the optical fiber in the drainage cavity, thereby ensuring the drainage speed.

A Y-shaped tube seat is provided at the open end of the tube body, a catheter portion is fixed to an outlet on the Y-shaped tube seat connected to the drainage cavity to form a drainage interface of the tube body, and a cable connector is installed on the outlet on the Y-shaped tube seat connected to the monitoring cavity, and the optical fiber, thermocouple, and pressure sensor wires are connected to the monitoring instrument via the cable connector.

The tube wall of the tube body is provided with a developing line, and the developing line is continuously arranged along the axial direction of the tube body. The setting of the developing line can show the depth of the drainage catheter entering the skull, which is convenient for observation during minimally invasive surgery.

The beneficial effects of the utility model are as follows: by inserting an optical fiber covered with a fluorescent film into the drainage cavity, the oxygen partial pressure of the cerebrospinal fluid drained in the drainage cavity is monitored by utilizing the principle of fluorescence quenching, and the temperature-pressure sensing element in the cavity is monitored to monitor the intracranial pressure and intracranial temperature, so that one drainage catheter can be used for drainage while completing the synchronous monitoring of the above three indicators, thereby reducing the number of catheterizations; at the same time, since the monitoring positions of the various indicators are close, the correlation between the various data is improved; and most of the optical fiber is located in the monitoring cavity, and only the end used to sense the oxygen partial pressure is located in the drainage cavity, thereby ensuring that there is sufficient drainage space in the drainage cavity and ensuring the efficiency of drainage.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1 is a schematic diagram of the structure of the utility model;

FIG2 is a schematic diagram of the structure of the utility model without connecting the monitoring instrument;

FIG3 is a schematic cross-sectional view of the front end of the tube body in Example 1;

FIG. 4 is a schematic cross-sectional view of the front end of the tube body in Example 2.

Figure numerals: 1. tube body; 101. drainage hole; 102. drainage cavity; 103. monitoring cavity; 104. monitoring hole; 105. through-hole; 106. developing line; 2. plug; 201. U-shaped channel; 3. pressure sensor; 301. wire; 4. thermocouple; 5. optical fiber; 501. fluorescent film; 6. probe housing; 601. pressure measuring window; 7. Y-type tube seat; 701. butterfly ear; 8. catheter part; 801. Luer connector; 9. adhesive; 10. cable connector; 11. monitoring instrument.

DETAILED DESCRIPTION

In order to enable those skilled in the art to better understand the technical solution in the utility model, the technical solution in the utility model is clearly and completely described below in conjunction with the accompanying drawings. Other embodiments obtained by those skilled in the art without making any creative work should all fall within the protection scope of the utility model.

As shown in Figures 1 and 2, the utility model provides a multimodal drainage catheter for intracranial monitoring, including a tube body 1, one end of the tube body 1 is open, and the other end of the tube body 1 is blocked by a plug 2. In order to facilitate observation during minimally invasive surgery, a developing line 106 is provided on the tube wall of the tube body 1, and the developing line 106 is continuously arranged along the axial direction of the tube body 1. The developing line 106 can be a barium sulfate layer formed in the tube wall of the tube body 1, which can be developed under X-ray irradiation.

The tube body 1 is a double-lumen catheter, and the two chambers of the tube body 1 are respectively a drainage cavity 102 and a monitoring cavity 103. The drainage cavity 102 is provided with a drainage hole 101 on the tube wall near the plug 2, and the monitoring cavity 103 is provided with a monitoring hole 104 on the tube wall near the plug 2. Preferably, there are multiple drainage holes 101, which are spaced apart along the axial direction of the tube body 1, and the height of the monitoring hole 104 is consistent with that of the first drainage hole 101 near the plug 2. A temperature-pressure sensor element is fixed in the monitoring cavity 103 corresponding to the monitoring hole 104, which is used to monitor intracranial pressure and intracranial temperature; an optical fiber 5 is provided in the monitoring cavity 103, and one end of the optical fiber 5 covered with a fluorescent film 501 penetrates into the drainage cavity 102 along a penetration path, which is used to monitor the oxygen partial pressure. In Example 1, as shown in Figure 3, a through hole 105 is opened on the tube wall between the drainage cavity 102 and the monitoring cavity 103, and the through hole 105 forms the through path. The optical fiber 5 is sealed and connected to the through hole 105. One end of the optical fiber 5 covered with a fluorescent film 501 extends and is fixed to the distal position of the tube wall corresponding to the drainage hole 101 through an adhesive 9. The adhesive 9 is a silicone adhesive that can transmit light from the optical fiber 5 and fluorescence from the fluorescent layer. The through hole 105 is located above the temperature-pressure sensing element and is set as close to the front end of the tube body 1 as possible, thereby reducing the length of the optical fiber 5 inserted into the drainage cavity 102. At this time, the end of the optical fiber 5 used to sense the oxygen partial pressure is located near the first drainage hole 101 and close to the monitoring position of the temperature-pressure sensing element, thereby improving the consistency of monitoring.

The temperature-pressure sensing element includes a thermocouple 4, a pressure sensor 3 and a probe housing 6 for wrapping the thermocouple 4 and the pressure sensor 3. The probe housing 6 is sealed and fixed in the monitoring cavity 103. A pressure measuring window 601 is provided on the probe housing 6. The sensing surface of the pressure sensor 3 corresponds to the monitoring hole 104 through the pressure measuring window 601. The pressure sensor 3 is a piezoresistive sensor or a piezoelectric sensor. The liquid pressure sensed by the sensing surface is converted into an electrical signal for transmission and recording of intracranial pressure. The thermocouple 4 senses the liquid temperature outside the tube body 1 and records the intracranial temperature. The thermocouple 4 and the pressure sensor 3 are sealed in the probe housing 6 by means of perfusion packaging, and the probe housing 6 is sealed in the monitoring cavity 103 by an adhesive 9.

The optical fiber 5 is a double optical fiber, including an incident optical fiber for irradiating excitation light to the fluorescent film 501 and an output optical fiber for receiving fluorescence excited by the fluorescent film 501. In order to increase the area of the sensing surface, one end of the optical fiber 5 covered with the fluorescent film 501 is an inclined surface. Since the sensing end is located at the far side of the tube wall corresponding to the drainage hole 101 in this embodiment, the inclined surface is arranged toward the drainage hole 101.

By inserting the optical fiber 5 covered with a fluorescent film 501 into the drainage cavity 102, the oxygen partial pressure of the cerebrospinal fluid drained in the drainage cavity 102 is monitored by utilizing the principle of fluorescence quenching, and the temperature-pressure sensing element in the monitoring cavity 103 monitors the intracranial pressure and intracranial temperature at the same time, it is possible to achieve simultaneous monitoring of the above three indicators while draining with one drainage catheter, thereby reducing the number of catheterization times; at the same time, since the monitoring positions of the various indicators are close, the correlation between the various data is improved; the correlation between the data is ensured, and most of the optical fiber 5 is located in the monitoring cavity 103, and only the end used for sensing the oxygen partial pressure is located in the drainage cavity 102, thereby ensuring that there is sufficient drainage space in the drainage cavity 102, thereby improving the drainage efficiency compared to the prior art and avoiding blockage due to occupation of the drainage cavity 102.

A Y-shaped tube seat 7 is provided at the open end of the tube body 1, and a catheter portion 8 is fixed to the outlet of the Y-shaped tube seat 7 connected to the drainage cavity 102 to form a drainage docking port of the tube body 1, and a cable connector 10 is installed on the outlet of the Y-shaped tube seat 7 connected to the monitoring cavity 103. The optical fiber 5 and the wire 301 of the thermocouple 4 and the pressure sensor 3 are connected to the monitoring instrument 11 via the cable connector 10. In order to prevent the wire 301 from being exposed, preferably, the thermocouple 4 and the wire 301 of the pressure sensor 3 located in the monitoring cavity 103 are wrapped with a wiring harness. A Luer connector 801 is installed in the drainage docking port of the catheter portion 8 for cooperation with a cranial drainage device for drainage. In order to facilitate the fixation of the drainage catheter on the patient's head during drainage, a butterfly ear 701 for binding is also formed on the outside of the Y-shaped tube seat 7.

As shown in Figure 4, the difference between Example 2 and Example 1 is that a U-shaped channel 201 connecting the drainage cavity 102 and the monitoring cavity 103 is opened in the plug 2, and the U-shaped channel 201 forms the penetration path. The optical fiber 5 is sealed and connected to the inner wall of the U-shaped channel 201 through an adhesive 9, and one end of the optical fiber 5 covered with a fluorescent film 501 extends and is fixed at a proximal position of the tube wall corresponding to the first drainage hole 101. In this embodiment, the optical fiber 5 passes through the outside of the probe housing 6 of the temperature-pressure sensor element and is sealed in the monitoring cavity 103 together with the probe housing 6 through an adhesive 9; the way in which the optical fiber 5 penetrates into the drainage cavity 102 through the plug 2 can minimize the space occupied by the optical fiber 5 in the drainage cavity 102, thereby ensuring the drainage speed. In this embodiment, in order to reduce the curvature of the optical fiber 5, the end of the optical fiber 5 covered with the fluorescent film 501 is finally located at a proximal position of the tube wall corresponding to the drainage hole 101, so the inclined surface arranged at this end is arranged to face away from the drainage hole 101.

As shown in FIG1 , taking Example 1 as an example, when implementing the technical solution, the temperature-pressure sensor element that has been perfused and packaged is placed in the monitoring cavity 103, the pressure measuring window 601 is aligned with the monitoring hole 104, and the probe housing 6 is bonded and sealed to the inner wall of the monitoring cavity 103 using an adhesive 9, one end of the optical fiber 5 is covered with a fluorescent film 501 to form a sensing area for oxygen partial pressure, and the fluorescent film 501 contains a fluorescent dye composed of an organic complex such as ruthenium or platinum, and its fluorescence quenching principle is a prior art, which will not be described in detail, the end of the optical fiber 5 is passed from the monitoring cavity 103 into the drainage cavity 102 through the through-port 105, and the through-port 105 is sealed using an adhesive 9, and the optical fiber 5 is bonded and fixed to the distal end corresponding to the drainage hole 101. On the side tube wall, the end of the optical fiber 5 and the wire 301 of the temperature-pressure sensor element pass through the end of the monitoring cavity 103 and are connected to the cable connector 10 to complete the assembly of the drainage catheter. When the drainage catheter is in use, the cable connector 10 is connected to the monitoring instrument 11. While the drainage cavity 102 drains the cerebrospinal fluid, the optical fiber 5 near the drainage hole 101 at the front end of the drainage cavity 102 monitors the oxygen partial pressure in the drained cerebrospinal fluid. At the same time, the temperature-pressure sensor element in the monitoring cavity 103 on the dorsal side of the drainage hole 101 monitors the intracranial pressure and intracranial temperature. At this time, the monitoring instrument 11 completes the synchronous monitoring of the above indicators, ensuring the correlation between the indicator data, so that the condition can be evaluated more accurately.

Claims (7)

1. The drainage catheter for multi-mode intracranial monitoring comprises a catheter body, wherein one end of the catheter body is open, the other end of the catheter body is plugged by a plug, the drainage catheter is characterized in that the catheter body is a double-cavity catheter, two cavities of the catheter body are a drainage cavity and a monitoring cavity respectively, the drainage cavity is provided with drainage holes on the pipe wall close to the plug, the monitoring cavity is provided with monitoring holes on the pipe wall close to the plug, and a temperature-pressure sensing element is fixed in the monitoring cavity corresponding to the monitoring holes and used for monitoring intracranial pressure and intracranial temperature; the monitoring cavity is internally provided with an optical fiber, and one end of the optical fiber covered with the fluorescent film penetrates into the drainage cavity along a penetrating path for monitoring oxygen partial pressure.

2. The drainage catheter for multi-mode intracranial monitoring according to claim 1, wherein the temperature-pressure sensing element comprises a thermocouple, a pressure sensor and a probe shell for wrapping the thermocouple and the pressure sensor, the probe shell is fixed in the monitoring cavity in a glue sealing mode, a pressure measuring window is formed in the probe shell, and the sensing surface of the pressure sensor corresponds to the monitoring hole through the pressure measuring window.

3. The drainage catheter for multi-mode intracranial monitoring according to claim 1, wherein a through hole is formed in a wall between the drainage cavity and the monitoring cavity, the through hole forms the through path, the optical fiber is in sealing connection with the through hole, and one end of the optical fiber covered with the fluorescent film extends and is fixed at a position far away from the wall corresponding to the drainage hole.

4. The drainage catheter for multi-mode intracranial monitoring according to claim 1, wherein a U-shaped channel which is communicated with the drainage cavity and the monitoring cavity is formed in the plug, the U-shaped channel forms the penetrating path, the optical fiber is in sealing connection with the U-shaped channel, and one end of the optical fiber covered with the fluorescent film extends and is fixed at the proximal position of the tube wall corresponding to the drainage hole.

5. The drainage catheter for multi-mode intracranial monitoring according to claim 2, wherein the Y-shaped tube seat is arranged at the opening end of the catheter body, a catheter part is fixed on an outlet communicated with the drainage cavity on the Y-shaped tube seat to form a drainage butt joint of the catheter body, a cable connector is arranged on an outlet communicated with the monitoring cavity on the Y-shaped tube seat, and the optical fiber, the thermocouple and the lead wire of the pressure sensor are connected with the monitoring instrument through the cable connector.

6. The drainage catheter for multi-modal intracranial monitoring according to claim 3 or 4, wherein the optical fiber is a double optical fiber including an incident optical fiber for irradiating excitation light to the fluorescent film and an exit optical fiber for receiving fluorescence excited from the fluorescent film.

7. The drainage catheter for multi-modal intracranial monitoring according to any one of claims 1 to 5, wherein the development lines are arranged on the wall of the catheter body, and the development lines are arranged continuously along the axial direction of the catheter body.