Tearable sheath with pressure measuring function, expansion assembly and negative pressure suction system

Abstract

According to the tearable sheath with the pressure measuring function, the expansion assembly and the negative pressure suction system, the tearable sheath can monitor pressure changes in a cavity in real time, good operability and safety are achieved in the tearing operation, and therefore the requirements for higher safety, operability and accuracy of a catheter sheath in a modern operation are met. The tearable sheath comprises a tearable sheath tube, the tearable sheath tube longitudinally extends from the near end to the far end, a main channel and a pressure measuring channel which longitudinally extend from the near side to the far side are defined in the tearable sheath tube, and the far end of the pressure measuring channel is provided with a pressure measuring opening for sensing cavity pressure.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of medical instruments, specifically to a kind of tearable sheath with pressure measurement function, suitable for the guidance of guiding instrument in medical operation and the real-time monitoring of intracavity pressure. BACKGROUND

[0002] Tearable sheath is a common catheter auxiliary device in the field of medical instruments, usually used to guide other medical instruments into specific parts of the patient's body. In some interventional surgery processes, such as cardiac electrophysiology, vascular intervention and urinary system surgery, the positioning and stability of the catheter are crucial to the success of the operation. Traditional catheter sheaths are designed to be non-tearable, and after the operation is completed, the catheter and the sheath need to be pulled out together, which may cause additional damage to the patient's tissue. In addition, traditional catheter sheaths usually lack real-time pressure monitoring function, making it difficult for medical personnel to understand the pressure changes in the cavity in a timely and accurate manner during some surgical procedures, thereby increasing the risk of surgery. With the development of medical technology, higher requirements are put forward for catheter sheaths. For example, in the operation of the urinary system, the operation of the urethra and the kidney and other parts has higher requirements for accuracy and safety. Traditional catheter sheaths are difficult to effectively avoid sudden changes in intracavity pressure during use, leading to problems such as fluid reflux and tissue damage. In addition, due to the complexity of the surgical environment, the catheter sheath may need to be frequently adjusted and repositioned during operation, and the traditional catheter sheath, due to its non-tearable structure, is often difficult to operate flexibly in a complex surgical environment. In this context, tearable sheaths emerged as the times require. The design of tearable sheath allows it to be easily torn and removed through the tear seam on the handle after the catheter is inserted, thereby avoiding any interference with the catheter or other inserted objects. This design not only reduces the complexity of operation during surgery, but also reduces the potential damage to the patient. The design of tearable sheath also improves the safety and efficiency of catheter guidance, especially in surgeries that require precise positioning. However, the existing tearable sheaths still have some technical deficiencies in use. First, the existing tearable sheaths usually lack real-time pressure monitoring function, making it difficult to obtain information about pressure changes in the cavity during surgery, increasing the risk of complications such as fluid reflux and organ damage during surgery. Second, the design of the existing tearable sheath may not be smooth during tearing, leading to incomplete tearing or tearing of fragments, which not only increases the difficulty of operation, but also may cause foreign matter to remain in the patient's body, further increasing the risk of surgery. SUMMARY

[0003] In view of the foregoing technical problems, the utility model provides a kind of tearable sheath with pressure measurement function, to provide a kind of tearable sheath that can monitor the pressure change in cavity in real time, and in tearing operation, it has good operability and safety, to meet the higher safety, operability and accuracy of modern surgery to catheter sheath demand.

[0004] The utility model provides a can tear sheath with pressure measurement function, the can tear sheath includes:

[0005] The can tear sheath pipe, the can tear sheath pipe from proximal end longitudinal extension to distal end, the can tear sheath pipe inside define from proximal longitudinal extension to distal main channel and pressure measurement channel, the distal end of pressure measurement channel has the pressure measurement mouth of inductive cavity pressure,

[0006] Handle, the handle includes the sheath seat of being located proximal end of the can tear sheath pipe and is connected on the first tear piece and the second tear piece of sheath seat, the sheath seat is equipped with the tearable seam that can tear along the axial, the proximal end of sheath seat has the connecting portion, the connecting portion includes the passage through it, and the passage is communicated with main channel, one of the first tear piece and the second tear piece has the pressure measurement tube cavity that communicates with pressure measurement channel, the pressure measurement tube cavity is equipped with calibration valve,

[0007] Pressure sensor, the pressure sensor is arranged in the first tear piece or the second tear piece to inductive pressure measurement tube cavity's pressure,

[0008] Negative pressure connector, the negative pressure connector includes the main pipe and at least one communication setting connecting head on the main pipe, the main pipe is suitable for with connecting portion with detachable mode sealed communication, the proximal end of main pipe is equipped with sealing cap,

[0009] PCB board, it is arranged on the first tear piece or the second tear piece, and at least one data connector is equipped on the PCB board, and the data connector is stretched from the first tear piece or the second tear piece to connect with external equipment,

[0010] Operation button, it is arranged on the first tear piece or the second tear piece, and operation button is connected with the PCB board to control the running state of negative pressure suction.

[0011] The can tear sheath of the utility model can monitor the pressure change in the cavity in real time, and medical staff can obtain the pressure data in the cavity in real time during the operation process, so as to effectively prevent complications such as liquid reflux and tissue damage caused by excessive or low pressure, and improve the safety and success rate of the operation. And the can tear sheath of the utility model integrates the pressure sensor, the PCB board and the control button on the existing tear piece, for example, the tear handle, one, compared with the setting in the host computer, the detection accuracy is improved. The second, through the control button, the pressure and the running state of the negative pressure suction can be controlled in time. During the negative pressure suction operation process, it is not necessary to operate frequently.

[0012] In some embodiments, the proximal end of the main pipe is provided with a pressure relief member for adjusting the pressure of the main channel, and the pressure relief member is arranged away from the negative pressure suction path to avoid contacting the liquid when adjusting the pressure of the liquid discharge path.

[0013] In some embodiments, the pressure relief member comprises a pressure relief valve, the main tube is provided with a pressure relief cavity in communication with the main channel of the tearable sheath, and the main tube is provided with a pressure relief valve for sealing or opening the pressure relief cavity.

[0014] In some embodiments, the pressure relief valve comprises a pressing portion connected to the pressure relief tube, and the pressure relief tube is provided with an openable and closable valve.

[0015] In some embodiments, the pressure measuring tube cavity is provided with a pressure measuring hole, and the pressure sensor is arranged outside the pressure measuring tube cavity and at least its sensing portion is arranged at the pressure measuring hole to sense the pressure of the pressure measuring tube cavity.

[0016] In some embodiments, the tearable sheath is sealingly connected to the first tear member or the second tear member to form a calibration chamber in the first tear member or the second tear member, the calibration chamber is in communication with the outside world to facilitate calibration and adjustment of the pressure sensor, the PCB board and the pressure sensor are arranged in the calibration chamber, the pressure measuring hole is arranged on the outer wall of the pressure measuring tube cavity and in communication with the calibration chamber, the pressure sensor is arranged in the calibration chamber and at least its sensing portion is arranged at the pressure measuring hole to collect the pressure in the pressure measuring tube cavity, and the pressure measuring tube cavity has an opening that can be in communication with the outside world, the opening can be opened or closed by a sealing member to realize calibration of the pressure sensor.

[0017] In some embodiments, the first tear member and the second tear member are respectively a first tear handle and a second tear handle, the first tear handle and the second tear handle are distributed symmetrically to the left and right of the sheath seat, and one of the first tear handle and the second tear handle defines a pressure measuring tube cavity and a calibration chamber, the pressure measuring tube cavity is in communication with the calibration chamber through a pressure measuring hole, the pressure measuring tube cavity is closed or opened by a sealing valve, the pressure sensor and the PCB board are arranged in the calibration chamber, and a control button is arranged on the first tear handle or the second tear handle.

[0018] In some embodiments, the data connector has an exhaust passage in communication with the outside world and the calibration chamber.

[0019] In some embodiments, the pressure measuring passage has an outer wall facing the outside world and an inner wall facing the main channel at the distal end, the distal end of the pressure measuring passage is opened to form a pressure measuring opening in communication with the outside world; or, the distal end of the pressure measuring passage is opened to form a pressure measuring opening in communication with the main channel; or, the distal end of the pressure measuring passage is opened to form a pressure measuring opening in communication with the outside world and the main channel; preferably, the opening of the inner wall of the pressure measuring passage is radially coincident or staggered with the opening of the outer wall.

[0020] In some embodiments, the connecting portion comprises a circumferentially extending circumferential outer wall, which is capable of being inserted into the proximal end of the dilator or the negative pressure connector, and the circumferential outer wall is provided with a limiting portion which is limited by the dilator.

[0021] Another purpose of the utility model lies in providing a dilating assembly, which comprises a dilator and the tearable sheath, the dilator comprises an elongated tube body and an operation end arranged at the proximal end of the tube body, the elongated tube body is adapted to penetrate the tearable sheath tube, the operation end defines a connecting channel, the connecting channel is connected with the elongated tube body, and the operation end is adapted to be sealingly connected with the sheath seat, the distal outer wall and the inner wall of the pressure measuring channel are both opened to form a pressure measuring port which is communicated with the outside and the main channel, a cavity is formed in the inside of the dilator, the cavity side wall has a side hole which is communicated with the pressure measuring port, foreign matters can enter the cavity from the side hole of the dilator and be discharged from the cavity, and preferably, the diameter of the side hole of the dilator is not less than the diameter of the pressure measuring port.

[0022] Still another purpose of the utility model lies in providing a negative pressure suction system, which comprises a suction device and the tearable sheath, the tearable sheath is detachably connected with a negative pressure connector, the negative pressure connector comprises a main tube and at least one connecting head which is communicated with the main tube, the main tube is adapted to be sealingly communicated with the connecting portion in a detachable manner, the proximal end of the main tube is provided with a sealing cap, and the connecting head is adapted to be sealingly connected with the suction device. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 A structure schematic view of the tearable sheath provided by the utility model is shown in the figure;

[0024] Figure 2 A structure sectional view of the tearable sheath provided by the utility model is shown in the figure;

[0025] Figure 3 A structure schematic view of the pressure relief valve (closed state) provided by the utility model is shown in the figure; Figure 2 A part A enlarged view of the figure;

[0026] Figure 4 A part B enlarged view of the figure; Figure 2 A part B enlarged view of the figure;

[0027] Figure 5 A structure schematic view of the dilating assembly provided by the utility model is shown in the figure.

[0028] Figure 6 A structure schematic view of the dilating assembly provided by the utility model is shown in the figure.

[0029] Figures 7-9 A structure schematic view of the dilating assembly provided by the utility model is shown in the figure. DETAILED DESCRIPTION

[0030] The technical scheme of the utility model or utility model will be further specifically explained below by means of specific embodiments and in conjunction with the drawings of the specification.

[0031] In the description of the utility model, it is understood that the orientation or position relationship indicated by the terms "front", "back", "upper", "lower" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In the present application, the proximal end should be interpreted as the part close to the operator (doctor), and the distal end should be understood as the part away from the doctor.

[0032] Example 1 Pressure-measurable tearable sheath: please refer to Figures 1-4 The utility model embodiment provides a kind of tearable sheath with pressure measurement function, to provide a kind of tearable sheath that can monitor the pressure change in cavity in real time, and it has good operability and safety in tearing operation, to meet the higher safety, operability and accuracy of catheter sheath demand of modern operation.The utility model provides tearable sheath with pressure measurement function including tearable sheath pipe 11, handle 12, pressure sensor 7, negative pressure connector 3, PCB board and control button 1231.The tearable sheath pipe 11 extends longitudinally from proximal end to distal end, and the tearable sheath pipe 11 is internally defined as main channel 111 and pressure measurement channel 112 extending longitudinally from proximal side to distal side, and the distal end of the pressure measurement channel 112 has pressure measurement port 113 for sensing cavity pressure.The handle 12 includes sheath seat 121 arranged at the proximal end of the tearable sheath pipe and first tearing member 122 and second tearing member 123 connected to the sheath seat, the sheath seat 121 is provided with tearable seam that can be torn in axial direction, and the proximal end of the sheath seat has connecting portion 125, the connecting portion 125 includes passage 126 passing therethrough, and the passage 126 is in communication with the main channel 111, and the connecting portion 125 is adapted to be sealingly connected with dilator 2 or negative pressure connector in detachable manner.The first tearing member 122 and the second tearing member 123 on the handle 12 can be conveniently torn to expose or remove guide instrument, one of the first tearing member 122 and the second tearing member 123 has pressure measurement lumen 127 in communication with the pressure measurement channel 112, and the pressure measurement lumen 112 is provided with calibration valve 8, and the calibration valve 8 is used for calibration of pressure sensor 7.

[0033] The pressure sensor 7 is arranged in the first tearing member 122 or the second tearing member 123 to be able to sense the pressure of the pressure sensing tube cavity 127. The PCB board is arranged on the first tearing member or the second tearing member, and at least one data connector is arranged on the PCB board, the data connector extends from the first tearing member 122 or the second tearing member 123 to be connected with an external device. The operation button is arranged on the first tearing member 122 or the second tearing member 123, and the operation button 1231 is connected with the PCB board to control the running state of the negative pressure suction, for example, to adjust the high and low of the negative pressure; the pressure sensor 7 and the PCB board are both located in the handle to facilitate the electrical connection of the two, and the installation of the operation button is more convenient; and the data connector 6 is used to be connected with an external device, for example, a main control machine, a negative pressure suction device and a display device, to realize the transmission of the pressure signal and the control of the running state of the negative pressure suction. In this way, the tearable sheath of the utility model integrates the pressure sensor, the PCB board and the control button on the existing tearing member, for example, a tearing handle. Firstly, compared with being arranged at the position of the main control machine, the pressure sensor is arranged in the tearing member, and the detection accuracy is improved. Secondly, the pressure and other running states of the negative pressure suction can be controlled in time through the control button. During the operation process of the negative pressure suction, it is not necessary to frequently change hands.

[0034] It can be understood that the pressure sensor 7 can be mounted on the inside or outside of the pressure sensing tube cavity, as long as the sensing part thereof is communicated with the pressure sensing tube cavity. In the embodiment, the tube wall of the pressure sensing tube cavity 127 is provided with a pressure sensing hole, the pressure sensor 7 is arranged on the inside of the first tearing member or the second tearing member, further, the pressure sensor 7 is located on the outside of the pressure sensing tube cavity 127, and the sensing part 71 thereof is arranged at the pressure sensing hole to sense the pressure of the pressure sensing tube cavity 127. In this way, the main part of the pressure sensor 7 does not occupy the space of the pressure sensing tube cavity 127, so that the pressure sensing tube cavity 127 can also be used as other auxiliary tube cavities, avoiding the occupation of resources by other instruments. Exemplarily, a water film is easily formed at the pressure sensing port at the distal end of the pressure sensing tube cavity, and the formation of the water film causes the pressure signal to be difficult to be transmitted to the pressure sensor in time and accurately, and it is difficult to detect the pressure in real time. In addition, the water film tension causes the signal transmitted to the pressure sensor to deviate from the actual pressure signal, thereby affecting the accuracy of the measurement. Exemplarily, the pressure sensing pressure P of the pressure sensor is P3 = P1 + P2, P1 is the cavity pressure, P2 is the water film tension, and P3 is the pressure in the pressure sensing tube cavity 105. Based on this, in some embodiments of the utility model, the pressure sensing sheath 10 further comprises a tension eliminating mechanism to eliminate the influence of the water film on the detection of the cavity pressure. The sealing member is opened, the pressure sensing tube cavity constitutes an air inlet tube for the high-frequency low-pressure gas outside to enter to eliminate the water film. Since the pressure sensor does not occupy the space of the pressure sensing tube cavity, the pressure sensing tube cavity can be used as an air inlet tube for eliminating the water film, thereby improving the space utilization efficiency of the tearable sheath. The interference of the water film on the signal transmission of the pressure sensor is effectively eliminated, and the timely and accurate transmission of the pressure signal is ensured.

[0035] It can be understood that the detection signal of the pressure sensor 7 can be connected with external devices through the data joint 6 for signal transmission and processing.

[0036] In some embodiments of the utility model, the pressure sensor 7 is a gauge pressure sensor, the tearable sheath 11 is sealedly connected between the first tearing member 122 or the second tearing member 123 to build a calibration chamber 10 in the first tearing member or the second tearing member, the calibration chamber 10 is communicated with the outside to facilitate the calibration and adjustment of the pressure sensor 7, a PCB board and a pressure sensor are arranged in the calibration chamber, the pressure tube cavity outer wall is provided with a pressure measuring hole 9 communicated with the calibration chamber, the pressure sensor 7 is positioned in the calibration chamber 10, and the sensing film thereof is arranged at the pressure measuring hole 9 to collect the pressure in the pressure tube cavity 127, and the pressure tube cavity has an opening communicated with the outside, and the opening can be opened or closed by the sealing member 8 to realize the calibration of the pressure sensor. Specifically, the working principle of the gauge pressure sensor is to determine the pressure value by measuring the pressure change of the sensor sensing film on the fluid or gas, then compare the value with the ambient pressure, and obtain the value of the relative pressure, if the pressure of the measurement point is higher than the atmospheric pressure, the sensor outputs a positive value, if lower than the atmospheric pressure, the sensor outputs a negative value or zero value. When the tearable sheath has not entered the body, the pressure measuring hole 113 at the distal end of the tearable sheath is communicated with the calibration chamber 10, and the calibration of the gauge pressure sensor is realized. When the tearable sheath enters the body, the sealing member 8 is opened, the pressure measuring channel is opened and communicated with the outside, and the calibration of the gauge pressure sensor is realized in cooperation with the calibration chamber 10. Compared with the installation of the main control machine and other external settings, the installation of the gauge pressure sensor in the tearing handle 122 or 123 reduces the volume of the pressure measuring cavity, quickly and accurately responds to the pressure change, avoids the attenuation and lag of the signal in the large space, and has higher precision.

[0037] In the embodiment, the first tearing member 122 and the second tearing member 123 are respectively a first tearing handle and a second tearing handle, the first tearing handle 122 and the second tearing handle 123 are symmetrically distributed on the left and right of the sheath seat, one of the first tearing handle and the second tearing handle is defined with a communicating pressure tube cavity 127 and a calibration chamber 10, the pressure tube cavity is communicated with the calibration chamber through a pressure measuring hole, the pressure tube cavity is closed or opened through a sealing valve 8, for example, a two-way valve, the pressure sensor 7 and the PCB board are installed in the calibration chamber 10, and a control button 1231 is arranged on the first tearing handle or the second tearing handle.

[0038] Further, the data joint 6 has an exhaust passage which communicates the outside with the calibration chamber. Since the pressure in the sealed calibration chamber in the handle will change due to the pressing operation of the operation button or other operation of the handle, resulting in the basic deviation of the sensor, the design of the exhaust passage eliminates the pressure fluctuation caused by the control button, maintains the pressure stability in the tearing handle, and avoids the pressure sensor pressure measurement accuracy caused by the pressure fluctuation in the tearing handle. By reasonably arranging the pressure sensor and its auxiliary equipment, combining the design of the calibration chamber and the exhaust pipe, the accurate pressure monitoring of the pressure measuring pipe cavity is realized, and the system stability and operation simplicity are ensured.

[0039] The negative pressure joint includes a main pipe 31 and at least one connecting head 32 arranged on the main pipe, the main pipe is adapted to be in sealed communication with the connecting part in a detachable manner, the proximal end of the main pipe is provided with a sealing cap 33, and in the embodiment, the negative pressure joint 3 is provided with a pressure relief sliding cover 321; the negative pressure joint 3 can be connected with a negative pressure suction device to realize the extraction of waste liquid, stones and the like. It can be understood that the pressure relief sliding cover 331 can also adopt other pressure regulating member structures such as the pressure relief member structure described below. As long as the air entering amount of the negative pressure connecting head 32 can be adjusted.

[0040] In some embodiments of the utility model, the proximal end of the main pipe 31 is provided with a pressure relief member 310 for adjusting the pressure of the main channel, the pressure relief member 310 is used for adjusting the pressure of the main channel 111, so that when the suction pressure is too large to cause the pressure in the renal pelvis to be too large and the organ is sucked flat and the like, air is quickly introduced through the pressure relief member 310 to quickly release pressure to ensure the operation. Preferably, the pressure relief member 310 is arranged away from the negative pressure suction path to avoid contacting the liquid when adjusting the pressure of the liquid discharge path. In this way, the liquid is not contaminated when the pressure relief member 310 is manually operated, achieving contactless and aseptic operation. When the suction pressure is too large to cause the suction of the calculus to fail, the user needs to manually increase the suction force, based on the pressure relief member 310 provided in the embodiment, the handheld negative pressure connector 3, by repeatedly and quickly controlling the pressure in the state cavity of the pressure relief member 310, the pressure will rapidly fluctuate between pressure relief and negative pressure, and the repeated pressure fluctuation can produce a strong suction effect, making it easier to extract the adsorbed or stuck calculus and the like. The rapidly changing pressure can generate sufficient impact force to help clear the blockage and ensure the smoothness of the suction channel. By controlling the pressure fluctuation, stronger suction force can be provided when needed, improving the efficiency and success rate of the operation. In some embodiments of the utility model, the pressure relief member includes a pressure relief valve 310, the negative pressure connector is provided with a pressure relief cavity 300 in communication with the main channel 111 of the tearable sheath tube, and the negative pressure connector 3 is provided with a pressure relief valve 310 for sealing or opening the pressure relief cavity 300. In some preferred embodiments of the utility model, the pressure relief cavity 127 is arranged on the proximal side of the connecting head 32, that is, the path of the pressure relief cavity is not used as the waste liquid discharge path, and it is away from the waste liquid discharge path. In this way, the waste liquid does not pass through the pressure relief cavity, and the liquid is not contaminated when the pressure relief valve is manually operated, achieving contactless and aseptic operation. When the suction pressure is too large to cause the suction of the calculus to fail, the user needs to manually increase the suction force, based on the pressure relief cavity 127 and the pressure relief valve provided in the embodiment, the handheld negative pressure connector, when the pressure relief valve is quickly opened, external air quickly enters the cavity, the pressure quickly rises, and the pressure relief effect is achieved; when the pressure relief valve is quickly closed, the suction device continues to work, the pressure in the cavity quickly drops, forming negative pressure, and being used for suction; by repeatedly and quickly opening and closing the pressure relief valve, the pressure in the cavity will rapidly fluctuate between pressure relief and negative pressure, and the repeated pressure fluctuation can produce a strong suction effect, making it easier to extract the adsorbed or stuck calculus and the like. Exemplarily, please refer to Figures 5-6 , the pressure relief valve includes a pressing part 128, the pressing part 128 is connected with a pressure relief hose (pressure relief cavity), a closable valve 138 is formed on the pressure relief hose (pressure relief cavity) Figure 5 , which is the closed state of the valve, Figure 6The opening state of the valve), so that the user controls the opening degree and closing of the valve 138 by the pressing force of the pressing portion 128.

[0041] The tearable sheath can monitor the pressure change in the cavity in real time, and medical personnel can obtain the pressure data in the cavity in real time during the operation, so that complications such as liquid reflux and tissue damage caused by excessively high or low pressure are effectively prevented, and the safety and success rate of the operation are improved.

[0042] Further, the embodiment provides a negative pressure suction system, comprising a suction device 9 and a tearable sheath, the tearable sheath is detachably connected with a negative pressure connector 3, the negative pressure connector comprises a main pipe and at least one connecting head communicated on the main pipe, the main pipe is adapted to be in sealed communication with the connecting portion in a detachable manner, a sealing cap 33 is arranged at the proximal end of the main pipe, and the connecting head 32 is adapted to be in sealed connection with the suction device, wherein the endoscope is sealed to pass through the main pipe into the tearable sheath pipe 11, a pressure sensor for measuring the pressure in the body cavity transmits a pressure signal value to the negative pressure device, and the negative pressure device adjusts the negative pressure suction pressure according to the size of the pressure signal value.

[0043] The distal side of the pressure measuring channel has an outer wall facing the outside and an inner wall facing the main channel of the tearable sheath pipe, in some embodiments, the distal side of the pressure measuring channel is opened to form a pressure measuring opening in communication with the outside, the outer opening type pressure measuring channel opening is in communication with the high pressure area in the cavity, the measurement accuracy is relatively high, and the cavity pressure can be truly fed back, but foreign matter is easy to enter the pressure measuring cavity through the outer pressure measuring opening, and the pressure measuring accuracy decreases after the pressure measuring channel is blocked. In another embodiment, the distal side of the pressure measuring channel is opened to form a pressure measuring opening in communication with the main channel; the pressure measuring opening is in communication with the low pressure area in the cavity, and the measurement value is relatively low compared with the overall pressure in the cavity, but the risk of foreign matter blocking the pressure measuring channel is excluded. In some embodiments of the utility model, please refer to Figure 3 , the distal side of the pressure measuring channel is opened to form a pressure measuring opening in communication with the outside and the main channel; and in this embodiment, the opening of the inner wall and the opening of the outer wall are radially corresponding, the full opening type pressure measuring opening is in communication with the high pressure area and the low pressure area in the cavity at the same time, the measurement accuracy is relatively high, and the cavity pressure can be truly fed back, but there is also the risk of pipe blocking. Or the opening of the inner wall and the opening of the outer wall are staggered, for example, in the form of Z, the Z-shaped pressure measuring opening is in communication with the high pressure area and the low pressure area in the cavity at the same time, the measurement accuracy is relatively high, and the cavity pressure can be truly fed back without the risk of pipe blocking. Preferably, the opening of the inner wall and the opening of the outer wall of the pressure measuring channel are staggered.

[0044] Embodiment 2 Expansion assembly: please refer to Figures 7-9The embodiment provides a dilating assembly, which comprises a tearable sheath and a dilator, the tearable sheath comprises a tearable sheath tube 11 and a handle 12, the handle 12 is provided with an axially tearable handle tear seam 121, the handle 12 comprises a sheath seat 121 arranged at the proximal end of the tearable sheath tube and a first tear seam 122 and a second tear seam 123 connected to the sheath seat, the sheath seat 121 is provided with an axially tearable tear seam, the proximal end of the sheath seat is provided with a connecting portion 125, the connecting portion 125 comprises a passage 126 passing through the connecting portion 125, the passage 126 is in communication with a main channel 111, the connecting portion 125 comprises a circumferentially extending circumferential outer wall, the circumferential outer wall can be inserted and matched with the proximal end of the dilator or a negative pressure connector, further, the circumferential outer wall is provided with at least one limiting buckle, so that the limiting buckle is used for limiting and matching the tearable sheath and the dilator or the negative pressure connector. Exemplarily, the circumferential outer wall is provided with limiting buckles 1251 and 1252.

[0045] The dilator 2 provided by the embodiment comprises an elongated tube body 21 and an operation end 22 arranged at the proximal end of the tube body, the elongated tube body 21 is suitable for penetrating through the tearable sheath tube 11, the operation end 22 defines a connecting channel, the connecting channel is in communication connection with the elongated tube body, the operation end 22 has a circumferentially extending circumferential inner wall 220, in particular, the circumferential inner wall 220 is inserted and matched with the circumferential outer wall of the connecting portion and can be rotationally matched, the circumferential inner wall 220 is provided with at least one limiting buckle slot 221 and 222, the circumferential inner wall 220 is rotationally matched with the circumferential outer wall, and the limiting buckles 1251 and 1252 are limitingly matched with the limiting buckle slots 221 and 222; in this way, the connecting portion is inserted and arranged in the circumferential inner wall of the operation end, the limiting buckles are buckled into the limiting buckle slots by rotation to keep relative fixation of the two. In order to guarantee the sealing performance of the two, the circumferential inner wall 220 and the circumferential outer wall are provided with a sealing ring 23.

[0046] In some embodiments of the utility model, the dilator has a tapered tip 212, and the tapered tip 212 is provided with a pricking edge 213 to enhance the tissue puncture force. Exemplarily, the proximal body of the elongated tube body 21 is made of a stainless steel metal piece, and the distal end 215 is made of a transparent high polymer material piece, so that an endoscope can be placed in the internal channel to observe the placement condition.

[0047] In some embodiments of the utility model, please refer to Figure 9When the tearable sheath enters the body cavity, the negative pressure suction and perfusion have not yet started. At this time, the dilator is inserted into the tearable sheath to ensure that the tearable sheath can smoothly enter the body cavity. Because the dilator occupies the tearable sheath, it is easy to cause foreign matter to enter the pressure measuring channel, causing the pressure measuring channel to be blocked and the pressure measuring accuracy to sharply decrease. Based on this, the distal outer wall and the inner wall of the pressure measuring channel are both opened to form a pressure measuring opening that communicates with the outside and the main channel, and the inside of the dilator forms a cavity 210, and the cavity side wall has a side hole 211 that communicates with the pressure measuring opening 113, and foreign matter can enter from the dilator side hole 211 and be discharged from the cavity. Specifically, the side hole is not less than the diameter of the pressure measuring opening. The diameter of the side hole of the dilator is not less than the diameter of the pressure measuring opening, which ensures that foreign matter can smoothly pass through the side hole and be discharged from the cavity, prevents the pressure measuring channel from being blocked, and improves the safety and convenience of the surgical operation.

[0048] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0049] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A tearable sheath having a pressure measuring function, characterized by, The tearable sheath comprises: a tearable sheath tube longitudinally extending from a proximal end to a distal end, the tearable sheath tube defining a main channel longitudinally extending from the proximal end to the distal end and a pressure sensing channel, the pressure sensing channel having a pressure sensing opening at the distal end for sensing a pressure in the pressure sensing channel; a handle comprising a sheath base provided at the proximal end of the tearable sheath tube, a first tearable member and a second tearable member connected to the sheath base, the sheath base having a tearable slit for being axially torn, the sheath base having a connecting portion at the proximal end, the connecting portion having a passage therethrough in communication with the main channel, one of the first tearable member and the second tearable member having a pressure sensing lumen in communication with the pressure sensing channel, the pressure sensing lumen having a calibration valve; a pressure sensor provided in the first tearable member or the second tearable member for sensing a pressure in the pressure sensing lumen; a negative pressure connector comprising a main tube and at least one connecting head provided on the main tube, the main tube being adapted to be detachably and sealingly connected to the connecting portion, the main tube having a sealing cap at the proximal end; a PCB provided in the first tearable member or the second tearable member, the PCB having at least one data connector extending out of the first tearable member or the second tearable member for being connected to an external device; an operation button provided on the first tearable member or the second tearable member, the operation button being connected to the PCB for controlling an operation state of the negative pressure suction.

2. The tearable sheath of claim 1, wherein, The proximal end of the main tube is provided with a pressure relief member for adjusting a pressure in the main channel, the pressure relief member being provided away from the negative pressure suction path so as not to contact liquid when adjusting the pressure in the liquid discharge path.

3. The tearable sheath of claim 2, wherein, The pressure relief member comprises a pressure relief valve, the main tube having a pressure relief lumen in communication with the main channel of the tearable sheath tube, the main tube having the pressure relief valve for sealing or opening the pressure relief lumen.

4. The tearable sheath of claim 3, wherein, The pressure relief valve comprises a pressing portion connected to a pressure relief hose, the pressure relief hose having an openable and closable valve.

5. The tearable sheath of claim 1, wherein, The pressure sensing lumen has a pressure sensing hole, the pressure sensor being provided outside the pressure sensing lumen and having a sensing portion at the pressure sensing hole for sensing a pressure in the pressure sensing lumen.

6. The tearable sheath of claim 1, wherein, The tearable sheath tube and the first tearable member or the second tearable member are sealingly connected to form a calibration chamber in the first tearable member or the second tearable member, the calibration chamber being in communication with the outside for facilitating calibration and adjustment of the pressure sensor, the calibration chamber having the PCB and the pressure sensor provided therein, the pressure sensing lumen having a pressure sensing hole in communication with the calibration chamber, the pressure sensor being positioned in the calibration chamber and having at least a sensing diaphragm provided at the pressure sensing hole for collecting a pressure in the pressure sensing lumen, the pressure sensing lumen having an opening in communication with the outside, the opening being openable or closable by a sealing member for realizing calibration of the pressure sensor.

7. The tearable sheath of claim 6, wherein, The first and second tearing members are first and second tearing handles, which are symmetrically arranged on the left and right of the sheath seat, and one of the first and second tearing handles is provided with a pressure measuring cavity and a calibration chamber, the pressure measuring cavity is communicated with the calibration chamber through a pressure measuring hole, the pressure measuring cavity is closed or opened through a sealing valve, the calibration chamber is provided with a pressure sensor and a PCB board, and a control button is arranged on the first or second tearing handle.

8. The tearable sheath of claim 1, wherein, The data connector has an exhaust passage for communicating the outside with the calibration chamber.

9. The tearable sheath of claim 1, wherein, The pressure measuring channel has an outer wall facing the outside and an inner wall facing the main channel, the distal end of the pressure measuring channel is opened to form a pressure measuring hole communicated with the outside, or the distal end of the pressure measuring channel is opened to form a pressure measuring hole communicated with the main channel, or the distal end of the pressure measuring channel is opened to form a pressure measuring hole communicated with the outside and the main channel.

10. The tearable sheath of claim 9, wherein, The opening of the inner wall of the pressure measuring channel is radially coincident with or staggered with the opening of the outer wall.

11. The tearable sheath of claim 1, wherein, The connecting part includes a circumferentially extending circumferential outer wall, which can be inserted into the proximal end of the dilator or the negative pressure connector, and the circumferential outer wall is provided with a limiting part limiting the dilator.

12. An expansion assembly comprising: The dilator includes an elongated tube and an operating end arranged at the proximal end of the tube, the elongated tube is adapted to penetrate the tearable sheath, the operating end defines a connecting channel, the connecting channel is connected with the elongated tube, and the operating end is adapted to be sealingly connected with the sheath seat, the distal end of the pressure measuring channel is opened to form a pressure measuring hole communicated with the outside and the main channel, the inside of the dilator forms a cavity, the side wall of the cavity has a side hole communicated with the pressure measuring hole, and foreign matters can enter the cavity of the dilator from the side hole.

13. The dilation assembly of claim 12, wherein, The diameter of the side hole of the dilator is not less than the diameter of the pressure measuring hole.

14. A negative pressure suction system, characterized in that The negative pressure suction device includes a suction device and the tearable sheath according to any one of claims 1-11, the tearable sheath is detachably connected with the negative pressure connector, the negative pressure connector includes a main tube and at least one connecting head arranged on the main tube, the main tube is adapted to be sealingly communicated with the connecting part in a detachable manner, the proximal end of the main tube is provided with a sealing cap, and the connecting head is adapted to be sealingly connected with the suction device.

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