Transmission shaft of left ventricle assisting device

Abstract

The utility model provides a transmission shaft of a left ventricle auxiliary device. The transmission shaft comprises a mandrel and a twisting shell arranged outside the mandrel in a sleeving mode. The near end of the mandrel is in transmission connection with a mandrel driving module of the driving control mechanism, and the far end of the mandrel is fixedly connected with the far end of a pump head impeller of the micro pump head. The near end of the twisting shell is in transmission connection with a twisting shell driving module of the driving control mechanism, the far end of the twisting shell is fixedly connected with the near end of a pump head impeller of the micro pump head, and the mandrel driving module drives the mandrel and the twisting shell to rotate synchronously so as to drive the far end and the near end of the pump head impeller to rotate together, so that the pump head impeller rotates at a fixed outer diameter; and driving the twisting shell to rotate relative to the mandrel through a twisting shell driving module so as to drive the near end of the pump head impeller to rotate relative to the far end, so that the pump head impeller is folded or unfolded. The transmission shaft provided by the utility model can reduce the overall volume of the micro pump head entering the body of a patient, so as to improve the use safety and convenience, and reduce the use cost of the whole auxiliary device at the same time.

Description

TECHNICAL FIELD

[0001] The utility model relates to transmission shaft technical field, concretely relates to a transmission shaft of left ventricular assist device. BACKGROUND

[0002] In recent years, the number of high-risk cardiovascular intervention surgeries increases year by year, in order to reduce the risk of death caused by blood circulation obstruction or stop in the operation process, the interventional left ventricular assist device has been widely used in high-risk cardiovascular intervention surgery. The interventional left ventricular assist device is a percutaneous mechanical circulation assist system which provides auxiliary blood flow for high-risk cardiovascular intervention surgery patients during and after operation through mechanical micro pump, can partially or completely assist the function of left ventricle, help the heart to deliver oxygenated blood to the whole body. The micro pump head and the driving device of the existing interventional left ventricular assist device are usually fixed integrally, and the whole enters the patient's body, on the one hand, the heat generated by the driving device during operation may cause harm to the patient, on the other hand, the driving mechanism needs to be replaced after use, which causes low utilization rate of the driving mechanism, and the use cost of the whole assist device is high. In addition, the driving device and the micro pump head are integrated, so that the overall structure of the micro pump head entering the patient's body is large. SUMMARY

[0003] The technical problem to be solved by the utility model is to provide a transmission shaft of left ventricular assist device, so as to reduce the overall volume of the micro pump head entering the patient's body, avoid harm to the human body, and reduce the use cost of the whole assist device.

[0004] In order to solve the above technical problems, the utility model provides a transmission shaft of left ventricular assist device, the transmission shaft is used for connecting the driving control mechanism and the micro pump head in the left ventricular assist device, and the transmission shaft comprises:

[0005] A mandrel, the proximal end of the mandrel is in transmission connection with the mandrel driving module of the driving control mechanism, and the distal end of the mandrel is fixedly connected with the distal end of the pump head impeller of the micro pump head;

[0006] A twisting shell, the twisting shell is movably sleeved on the outside of the mandrel, the proximal end of the twisting shell is in transmission connection with the twisting shell driving module of the driving control mechanism, and the distal end of the twisting shell is fixedly connected with the proximal end of the pump head impeller, wherein

[0007] The mandrel and the twisting shell are driven to rotate synchronously by the mandrel driving module to drive the distal end and the proximal end of the pump head impeller to rotate together, so that the pump head impeller rotates with a fixed outer diameter, and the twisting shell is driven to rotate relative to the mandrel by the twisting shell driving module to drive the proximal end of the pump head impeller to rotate relative to the distal end, so that the pump head impeller is folded or unfolded.

[0008] In one embodiment, the twisting shell comprises a twisting shell micro pump head connecting section, a twisting shell flexible section and a twisting shell drive control mechanism connecting section, the twisting shell flexible section is fixedly connected with the twisting shell micro pump head connecting section and the twisting shell drive control mechanism connecting section by welding respectively; wherein the distal end of the twisting shell micro pump head connecting section is used for fixedly connecting with the proximal end of the pump head impeller, and the proximal end of the twisting shell drive control mechanism connecting section is used for drivingly connecting with the drive module of the twisting shell.

[0009] In one embodiment, the transmission shaft further comprises a protective sleeve, the protective sleeve is movably sleeved outside the twisting shell, the proximal end of the protective sleeve is drivingly connected with the protective sleeve drive module in the drive control mechanism, and the distal end of the protective sleeve is fixedly connected with the proximal end of the pump head protection assembly of the micro pump head, the size of the outer diameter of the pump head protection assembly is controlled by controlling the protective sleeve to slide on the twisting shell through the protective sleeve drive module.

[0010] In one embodiment, the left ventricular assist device further comprises a pressure sensor, the pressure sensor comprises an optical fiber, an optical fiber hole is formed in the protective sleeve, and the optical fiber is arranged in the optical fiber hole.

[0011] Optionally, the pressure sensor further comprises a fiber grating demodulator, and the optical fiber is in communication connection with the fiber grating demodulator through a threaded connector.

[0012] In one embodiment, a distal end slot is formed in the distal end of the protective sleeve, and a proximal end slot is formed in the proximal end of the protective sleeve.

[0013] In one embodiment, the distal end slot is arranged on the side wall of the distal end of the protective sleeve and extends in the axial direction, and the proximal end slot is arranged on the side wall of the proximal end of the protective sleeve and located in the extension direction of the distal end slot.

[0014] In one embodiment, a twisting connecting piece mounting slot adapted to the proximal end of the pump head impeller is formed in the distal end of the twisting shell micro pump head connecting section.

[0015] In one embodiment, the optical fiber comprises a pressure monitoring optical fiber and a signal transmission optical fiber, the signal transmission optical fiber is integrally formed with the pressure monitoring optical fiber, and the proximal end of the signal transmission optical fiber is fixedly and communicatively connected with the fiber grating demodulator through a threaded connector.

[0016] In one embodiment, the signal transmission optical fiber is fixedly bonded with the optical fiber hole.

[0017] In one embodiment, the protective sleeve is prepared from a medical Pebax tube, the twisting shell is prepared from a plurality of double-layer synchronous torque spring tubes, and / or the mandrel is prepared from a plastic-coated steel wire rope.

[0018] The above scheme of the utility model has at least the following beneficial effects:

[0019] The transmission shaft of the left ventricular assist device provided by the above scheme is used for connecting the driving control mechanism and the micro pump head in the left ventricular assist device, and comprises: a mandrel, the proximal end of the mandrel is in transmission connection with the mandrel driving module of the driving control mechanism, and the distal end of the mandrel is fixedly connected with the distal end of the pump head impeller of the micro pump head; a twisting shell, the twisting shell is sleeved outside the mandrel, the proximal end of the twisting shell is in transmission connection with the twisting shell driving module of the driving control mechanism, and the distal end of the twisting shell is fixedly connected with the proximal end of the pump head impeller of the micro pump head, wherein the mandrel and the twisting shell are driven to rotate synchronously by the mandrel driving module to drive the distal end and the proximal end of the pump head impeller to rotate together, so that the pump head impeller rotates with a fixed outer diameter; and the twisting shell is driven to rotate relative to the mandrel by the twisting shell driving module to drive the proximal end of the pump head impeller to rotate relative to the distal end, so that the pump head impeller is folded or unfolded to adjust the outer diameter of the pump head impeller; when the left ventricular assist device is used, the driving control mechanism is connected with the micro pump head through the transmission shaft, the driving control mechanism is placed outside the patient as a whole, the overall volume of the micro pump head entering the patient's body is reduced, the convenience and safety of use are improved, and the harm caused by heat generated by the motor in the driving control mechanism to the patient can also be avoided; in addition, the driving control mechanism can be reused, and the use cost of the entire assist device is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a perspective structural schematic view of the transmission shaft provided by an optional embodiment of the utility model;

[0021] Figure 2 is a half cutaway view of the transmission shaft provided by an optional embodiment of the utility model;

[0022] Figure 3 is a perspective structural schematic view of the protective sleeve provided by an optional embodiment of the utility model;

[0023] Figure 4 is a perspective structural schematic view of the twisting shell provided by an optional embodiment of the utility model;

[0024] Figure 5 is a perspective structural schematic view of the mandrel provided by an optional embodiment of the utility model;

[0025] Figure 6 is a cutaway view of the left ventricular assist device provided by an optional embodiment of the utility model;

[0026] Figure 7 is a schematic view of the pressure sensor provided by an optional embodiment of the utility model;

[0027] Figure 8is a schematic diagram of the optical fiber groove in the driving control mechanism provided by the utility model one optional embodiment;

[0028] Figure 9 is a schematic diagram of the pressure sensor connected with the transmission shaft and the driving control mechanism provided by the utility model one optional embodiment.

[0029] Explanation of reference numerals:

[0030] 10, left ventricular assist device;

[0031] 1, pressure sensor; 11, optical fiber; 111, pressure monitoring optical fiber; 112, signal transmission optical fiber; 12, optical fiber grating demodulator;

[0032] 2, micro pump head; 21, pump head protection assembly; 22, pump head impeller; 23, pump head transmission assembly;

[0033] 3, transmission shaft; 31, protective sleeve; 311, optical fiber hole; 312, protective sleeve distal end notch; 313, protective sleeve proximal end notch; 32, twisting shell; 321, twisting connecting piece installation notch; 322, twisting shell micro pump head connecting section; 323, twisting shell flexible section; 324, twisting shell driving control mechanism connecting section; 33, mandrel;

[0034] 4, driving control mechanism; 40, optical fiber groove; 41, protective sleeve driving module; 42, twisting shell driving module; 43, mandrel driving module. DETAILED DESCRIPTION

[0035] Exemplary embodiments of the present disclosure will be described more fully hereinafter with reference to the accompanying drawings. While example embodiments of the present disclosure are shown in the drawings, it is understood that the present disclosure can be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art.

[0036] In the following description, certain specific details are set forth in order to provide a thorough understanding of various disclosed embodiments. However, one skilled in the relevant arts will recognize that embodiments can be practiced without one or more of the specific details, or with other methods, components, materials, and so forth. In other instances, well-known structures, structures, and processes associated with the present application are not shown or described in order to avoid obscuring embodiments.

[0037] Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of the phrase "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics can be combined in any suitable manner in one or more embodiments.

[0038] In the following description, in order to clearly show the structure and working mode of the utility model, directional words will be used for description, but the words of "front", "back", "left", "right", "outer", "inner", "outward", "inward", "up", "down" and the like should be understood as convenient words, and should not be understood as limiting words.

[0039] As shown in Figure 6 The transmission shaft 3 provided by the embodiments of the utility model is applied to the left ventricular assist device 10, the proximal end of the transmission shaft 3 is in transmission connection with the driving control mechanism 4, and the distal end of the transmission shaft 3 is fixedly connected with the micro pump head 2; when the left ventricular assist device 10 is used, the distal end of the transmission shaft 3 enters the patient's body together with the micro pump head 2.

[0040] Specifically, as shown in Figures 1-2 and Figure 6 The micro pump head 2 comprises a pump head impeller 22 and a pump head transmission assembly 23, and the transmission shaft 3 comprises a twisting shell 32 and a mandrel 33. The driving control mechanism 4 comprises a twisting shell driving module 42 and a mandrel driving module 43.

[0041] The transmission shaft 3 of the left ventricular assist device 10 comprises the mandrel 33 and the twisting shell 32. The proximal end of the mandrel 33 is in transmission connection with the mandrel driving module 43 of the driving control mechanism 4, and the distal end of the mandrel 33 is fixedly connected with the distal end of the pump head impeller 22 of the micro pump head 2; the twisting shell 32 is movably sleeved outside the mandrel 33, the proximal end of the twisting shell 32 is in transmission connection with the twisting shell driving module 42 of the driving control mechanism 4, and the distal end of the twisting shell 32 is fixedly connected with the proximal end of the pump head impeller 22 of the micro pump head 2. The mandrel 33 and the twisting shell 32 are driven to rotate synchronously by the mandrel driving module 43 to drive the distal end and the proximal end of the pump head impeller 22 to rotate together, so that the pump head impeller 22 rotates with a fixed outer diameter; and the twisting shell 32 is driven to rotate relative to the mandrel 33 by the twisting shell driving module 42 to drive the proximal end of the pump head impeller 22 to rotate relative to the distal end, so that the pump head impeller 22 is folded or unfolded, and the size of the outer diameter of the pump head impeller 22 is adjusted.

[0042] In this embodiment, as shown in Figure 6As shown, the drive shaft 3 serves as the connector between the drive control mechanism 4 and the micro-pump head 2 in the entire left ventricular assist device 10. It can drive and control the micro-pump head 2 at the distal end of the assist device, which enters the patient's body, through the drive control mechanism 4 at the proximal end of the assist device. This avoids the drive control mechanism 4 entering the patient's body along with the micro-pump head 2, which not only reduces the size of the interventional incision but also avoids the potential harm to the patient caused by the heat generated by the motor in the drive control mechanism 4. At the same time, the drive control mechanism 4 can be reused outside the patient's body, thereby reducing the overall cost of using the left ventricular assist device 10.

[0043] Preferably, the distal end of the mandrel 33 is bonded and fixed to the proximal end of the pump head drive assembly 23; the distal end of the twisted shell 32 is bonded and fixed to the proximal end of the pump head impeller 22; and the distal end of the pump head impeller 22 is bonded and fixed to the distal end of the pump head drive assembly 23. More preferably, all of these bonding and fixing can be done with biocompatible adhesive to avoid harm to the human body.

[0044] Here, both the mandrel 33 and the twisting shell 32 are cylindrical, and the twisting shell 32 is an annular cylinder with its inner diameter matching the outer diameter of the mandrel 33 so that it can be fitted onto the outside of the mandrel 33; wherein, the length of the mandrel 33 is longer than the length of the twisting shell 32, and the lengths of both can be set according to the actual needs of the application.

[0045] Preferably, the mandrel 33 can be made of plastic-coated steel wire rope, and the twisted shell 32 can be made of multi-strand double-layer synchronous torque spring tube.

[0046] like Figure 4 As shown, in an optional embodiment of this utility model, the twisting shell 32 may include a twisting shell micro-pump head connecting section 322, a twisting shell flexible section 323, and a twisting shell drive control mechanism connecting section 324. The twisting shell flexible section 323 is fixedly connected to the twisting shell micro-pump head connecting section 322 and the twisting shell drive control mechanism connecting section 324 by welding. The distal end of the twisting shell micro-pump head connecting section 322 is fixedly connected to the proximal end of the pump head impeller 22, and the proximal end of the twisting shell drive control mechanism connecting section 324 is drively connected to the twisting shell drive module 42. Here, the twisting shell flexible section 323 may be integrally formed from multiple strands of double-layer synchronous torque spring tubes to improve the flexibility of the entire drive shaft 3 during use.

[0047] Preferably, the distal end of the twisted shell micro pump head connecting section 322 is provided with a twisted connector mounting slot 321 that is adapted to the proximal end of the pump head impeller 22. When assembling the pump head impeller 22 and the twisted shell 32, the twisted connector mounting slot 321 is engaged with the twisted shell connecting slot at the proximal end of the pump head impeller 22 to achieve stable torque transmission between the twisted shell 32 and the pump head impeller 22. More preferably, biocompatible adhesive can be used at the engagement point to bond the parts together, which can improve the stable connection between the two while avoiding harm to the human body.

[0048] like Figure 3 As shown, in an optional embodiment of the present invention, the drive shaft 3 of the left ventricular assist device 10 may further include a protective sleeve 31. The protective sleeve 31 is movably fitted over the twisting shell 32. The proximal end of the protective sleeve 31 is connected to the protective sleeve drive module 41 in the drive control mechanism 4, and the distal end of the protective sleeve 31 is fixedly connected to the proximal end of the pump head protection component 21 of the micro pump head 2. The protective sleeve 31 is controlled to slide on the twisting shell 32 by the protective sleeve drive module 41 to change the outer diameter of the pump head protection component 21.

[0049] In this embodiment, the protective sleeve 31 serves as a protective layer between the spindle 33 and the twisting shell 32. It is an annular cylinder and is fitted over the outside of the twisting shell 32. The inner diameter of the protective sleeve 31 is slightly larger than the outer diameter of the twisting shell 32 to facilitate its fit. Preferably, lubricant is filled between the protective sleeve 31 and the twisting shell 32 to reduce the heat generated by the drive shaft 3 during operation. The twisting shell 32 is slightly longer than the protective sleeve 31, and their lengths can be adjusted according to actual application requirements. Preferably, the protective sleeve 31 can be made of medical Pebax tubing, but it is not limited to medical Pebax tubing; other suitable materials harmless to the human body can also be selected. Preferably, the distal end of the protective sleeve 31 and the proximal end of the pump head protection assembly 21 can be fixedly bonded with biocompatible adhesive to avoid harm to the human body.

[0050] In an optional embodiment of this utility model, the left ventricular assist device 10 may further include a pressure sensor 1, such as... Figure 7 As shown, the fiber optic pressure sensor 1 includes an optical fiber 11 and a fiber Bragg grating demodulator 12. The optical fiber 11 and the fiber Bragg grating demodulator 12 are connected via a threaded connector. A fiber optic hole 311 is provided on the protective sleeve 31, and the optical fiber 11 passes through the fiber optic hole 311. When using the left ventricular assist device 10, a portion of the pressure sensor 1 enters the patient's body along with the miniature pump head 2, enabling real-time acquisition of the patient's blood flow pressure data to accurately capture changes in blood flow pressure.

[0051] In an optional embodiment of this utility model, the protective sleeve 31 has a distal slot 312 and a proximal slot 313 respectively provided for assembling and fixing the optical fiber 11. Preferably, the distal slot 312 is provided on the side wall of the distal end of the protective sleeve 31 and extends axially, and the proximal slot 313 is provided on the side wall of the proximal end of the protective sleeve and is located in the extending direction of the distal slot 312. The distal end of the optical fiber 11 enters the optical fiber hole 311 through the proximal slot 313 of the protective sleeve 31 and exits through the distal slot 312 of the protective sleeve 31.

[0052] like Figures 7 to 9 As shown, the fiber Bragg grating demodulator 12 is fixed to the drive control mechanism 4 and communicates with the controller module of the left ventricular assist device 10. The distal end of the optical fiber 11 passes sequentially through the fiber optic slot 40 of the drive control mechanism 4 and the fiber optic hole 311 of the protective sleeve 31, so that the entire optical fiber 11 is laid within the fiber optic slot 40 of the drive control mechanism 4 and the fiber optic hole 311 of the protective sleeve 31; the proximal end of the optical fiber 11 communicates with the fiber Bragg grating demodulator 12 through a threaded connector.

[0053] Here, the optical fiber 11 may specifically include a pressure monitoring optical fiber 111 and a signal transmission optical fiber 112. The signal transmission optical fiber 112 is integrally formed with the pressure monitoring optical fiber 111, and the near end of the signal transmission optical fiber 112 is communicatively connected to the fiber optic demodulator 12 via a threaded connector.

[0054] In this embodiment, the pressure monitoring fiber 111 is a written fiber segment used to monitor blood flow pressure data in the patient's body in real time; the signal transmission fiber 112 is a non-written fiber segment, and its proximal end is connected to the fiber optic demodulator 12 via a threaded connector, used to transmit the blood flow pressure data monitored by the pressure monitoring fiber 111 to the fiber optic demodulator 12 in real time. The pressure monitoring fiber 111 is laid close to the micropump head 2 and, when using the auxiliary device, enters the patient's body along with the micropump head 2 for real-time monitoring.

[0055] During the laying of the optical fiber 11, the pressure monitoring optical fiber 111 is inserted into the optical fiber hole 311 through the near end slot 313 of the protective sleeve 31 and exits through the far end slot 312 of the protective sleeve 31. At the same time, while ensuring that the pressure monitoring optical fiber 111 is completely inserted through the optical fiber hole 311 and just placed in the far end slot 312, the signal transmission optical fiber 112 is bonded and fixed to the optical fiber hole 311 to prevent it from falling off during use, thereby realizing real-time monitoring of blood flow pressure and improving the accuracy of monitoring. Preferably, biocompatible adhesive can be used to bond and fix the signal transmission optical fiber 112 to the optical fiber hole 311 to avoid causing harm to the human body.

[0056] The above is the preferred embodiment of the present application, it should be pointed out that, for those skilled in the ordinary in the art, without departing from the principles described in the present application, can be made several improvements and refinements, these improvements and refinements should also be considered as the scope of protection of the present application.

Claims

1. A drive shaft for a left ventricular assist device, the drive shaft being used to connect a drive control mechanism (4) and a micro pump head (2) in the left ventricular assist device, characterized in that, The drive shaft includes: The mandrel (33) is connected to the mandrel drive module (43) of the drive control mechanism (4) via a transmission connection at its proximal end, and to the pump head impeller (22) of the micro pump head (2) via a fixed connection at its distal end. A twisting shell (32) is movably fitted outside the mandrel (33). The proximal end of the twisting shell (32) is connected to the twisting shell drive module (42) of the drive control mechanism (4), and the distal end of the twisting shell (32) is fixedly connected to the proximal end of the pump head impeller (22). The mandrel (33) and the twisting shell (32) are driven to rotate synchronously by the mandrel drive module (43) to drive the distal and proximal ends of the pump head impeller (22) to rotate together, so that the pump head impeller (22) rotates with a fixed outer diameter; and the twisting shell (32) is driven to rotate relative to the mandrel (33) by the twisting shell drive module (42) to drive the proximal end of the pump head impeller (22) to rotate relative to the distal end, so that the pump head impeller (22) folds or unfolds.

2. The drive shaft of the left ventricular assist device according to claim 1, characterized in that, The twisting shell (32) includes a twisting shell micro pump head connecting section (322), a twisting shell flexible section (323), and a twisting shell drive control mechanism connecting section (324). The flexible section (323) of the twisted shell is fixedly connected to the connecting section (322) of the twisted shell micro pump head and the connecting section (324) of the twisted shell drive control mechanism by welding; wherein The distal end of the twisted shell micro pump head connecting section (322) is used to be fixedly connected to the proximal end of the pump head impeller (22), and the proximal end of the twisted shell drive control mechanism connecting section (324) is used to be drivenly connected to the twisted shell drive module (42).

3. The drive shaft (3) of the left ventricular assist device according to claim 2, characterized in that, The drive shaft (3) also includes a protective sleeve (31), which is movably fitted over the twisting shell (32). The proximal end of the protective sleeve (31) is connected to the protective sleeve drive module (41) in the drive control mechanism (4), and the distal end of the protective sleeve (31) is fixedly connected to the proximal end of the pump head protection assembly (21) of the micro pump head (2). The protective sleeve (31) is controlled by the protective sleeve drive module (41) to slide on the twisted shell (32) to control the outer diameter of the pump head protection assembly (21).

4. The drive shaft of the left ventricular assist device according to claim 3, characterized in that, The left ventricular assist device also includes a pressure sensor, the pressure sensor (1) includes an optical fiber (11), the protective sleeve (31) has an optical fiber hole (311), and the optical fiber (11) passes through the optical fiber hole (311).

5. The drive shaft of the left ventricular assist device according to claim 4, characterized in that, The pressure sensor (1) also includes a fiber Bragg grating demodulator (12), and the optical fiber (11) is connected to the fiber Bragg grating demodulator (12) via a threaded connector.

6. The drive shaft of the left ventricular assist device according to claim 3, characterized in that, The protective sleeve (31) has a distal slot (312) at its distal end and a proximal slot (313) at its proximal end.

7. The drive shaft of the left ventricular assist device according to claim 6, characterized in that, The distal slot (312) is disposed on the side wall of the distal end of the protective sleeve (31) and extends axially, and the proximal slot (313) is disposed on the side wall of the proximal end of the protective sleeve (31) and is located in the extending direction of the distal slot (312).

8. The drive shaft of the left ventricular assist device according to claim 7, characterized in that, The distal end of the twisted shell micro pump head connecting section (322) is provided with a twisted connector mounting slot (321) that is adapted to the proximal end of the pump head impeller (22).

9. The drive shaft of the left ventricular assist device according to claim 8, characterized in that, The optical fiber (11) includes a pressure monitoring optical fiber (111) and a signal transmission optical fiber (112). The signal transmission optical fiber (112) is integrally formed with the pressure monitoring optical fiber (111). The near end of the signal transmission optical fiber (112) is fixed and connected to the fiber optic demodulator (12) via a threaded connector.

10. The drive shaft of the left ventricular assist device according to claim 9, characterized in that, The signal transmission optical fiber (112) is bonded and fixed to the optical fiber hole (311).

11. The drive shaft of the left ventricular assist device according to claim 3, characterized in that, The protective sleeve (31) is made of medical Pebax tubing, the twisted shell (32) is made of multi-strand double-layer synchronous torque spring tubing, and / or the mandrel (33) is made of plastic-coated steel wire rope.

Images