Adjustable position of blood pump fixation ventricular connection device

Abstract

The application discloses a kind of blood pump fixed position adjustable ventricle connecting device, comprising: apex suture assembly and adjustable connecting assembly, apex suture assembly includes suture washer and snap ring, snap ring is equipped with first connecting ring, second connecting ring with opening and is integrally connected on the side of first connecting ring and connecting block;Adjustable connecting assembly includes clamp and fastener, clamp is equipped with hoop body with opening and two connecting lugs connected in hoop body both ends, hoop body is arranged in second connecting ring, and positioning pin is arranged on hoop body, and positioning pin is movably inserted in the positioning hole of second connecting ring;Two connecting lugs stretch out from the opening of second connecting ring, fastener is connected on connecting block with two connecting lugs, and when fastener rotates, the inner diameter of hoop body can be contracted or expanded.The application can adjust the fixed position of ventricle connecting device on inlet pipe according to patient needs, and control the best depth of inlet pipe inserted into ventricle.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ventricular assist circulation medical devices, and particularly relates to a heart room connecting device with adjustable blood pump fixing position. BACKGROUND

[0002] Blood pump or ventricular assist device is used to provide mechanical support for blood circulation of patients with advanced refractory heart failure, that is, to provide transition treatment before heart transplantation or to restore heart function and long-term treatment. The blood pump is connected with the ventricle and the aorta of the patient in parallel bypass mode, the inlet pipe of the blood pump is inserted into the ventricle from the heart apex, the impeller of the blood pump is driven by power to work, so that the blood enters the pump cavity from the ventricle through the pump inlet, under the centrifugal action of the impeller, the blood is discharged from the pump outlet, and then reaches the ascending aorta through the bridging artificial blood vessel, thereby supporting the blood circulation of the patient.

[0003] In the blood pump implantation operation, a ventricular connecting assembly is usually used to fix and install the blood pump on the biological tissue. However, if the depth of the blood pump inlet pipe inserted into the heart is too deep, the distal end of the inlet of the blood pump in the ventricle cannot be fully flushed with blood, and thrombus is easily formed, thereby affecting the safety of the patient's life; if the depth of the blood pump inlet pipe inserted is too shallow, the myocardial cells grow towards the pipe opening of the inlet pipe, which reduces the flow area of the inlet pipe of the blood pump, thereby affecting the performance of the blood pump and the clinical effect. Since the sizes of the hearts of different patients are inconsistent and the thicknesses of the myocardium are different, the length of the blood pump inserted into the apex and into the ventricle needs to be different for different patients. However, the fixing position of the ventricular connecting device and the blood pump in the prior art is generally not adjustable, which cannot meet the needs of patients with different myocardial thicknesses. Therefore, it is necessary to improve the prior art to overcome the defects in the prior art. SUMMARY

[0004] In order to solve the above technical problems, the present application provides a ventricular connecting device with adjustable blood pump fixing position to overcome the defects of the prior art that the fixing position of the blood pump on the ventricular connecting device is not adjustable, the depth of the blood pump inserted into the ventricle cannot be controlled, and the clinical needs of patients with different myocardial thicknesses cannot be met.

[0005] The technical scheme adopted by the present application to solve its technical problems is: a ventricular connecting device with adjustable blood pump fixing position, comprising:

[0006] a heart apex suture assembly for being sutured on the heart apex, the heart apex suture assembly comprising a suture washer and a snap ring, the snap ring being provided with a first connecting ring, a second connecting ring integrally connected to one side of the first connecting ring and having an opening, and a connecting block arranged at the opening of the second connecting ring, and the suture washer being fixedly connected to the other side of the first connecting ring;

[0007] An adjustable connecting assembly for connecting the apex suturing assembly and the blood pump, the adjustable connecting assembly comprises a clamp and a fastener, the clamp is provided with a clamp body in the shape of a ring and having an opening, and two spaced connecting lugs connected at both ends of the clamp body, the clamp body is arranged in the second connecting ring, and the clamp body is provided with a positioning pin movably inserted in the positioning hole arranged in the second connecting ring in the radial direction; the two connecting lugs outwardly extend from the opening of the second connecting ring, the fastener connects the two connecting lugs on the connecting block, and when the fastener rotates, the two connecting lugs can approach or move away from each other, so that the inner diameter of the clamp body is contracted or expanded.

[0008] As a further improvement of the present application, the connecting block is integrally connected to one side of the first connecting ring, and a first through hole is arranged in the middle of the connecting block for the fastener to pass through.

[0009] As a further improvement of the present application, the two connecting lugs are arranged on both sides of the connecting block respectively, and a second through hole opposite to the first through hole is arranged on one of the connecting lugs, and a threaded hole opposite to the first through hole is arranged on the other connecting lug; the fastener is a screw which is sequentially threaded through the second through hole, the first through hole and then screwed into the threaded hole.

[0010] As a further improvement of the present application, a plurality of positioning pins are arranged on the outer circumferential surface of the clamp body in the radial direction, and the second connecting ring is provided with a plurality of positioning holes for one-to-one corresponding insertion of the plurality of positioning pins, and the length of the positioning pin inserted into the positioning hole can be changed when the inner diameter of the clamp body is adjusted.

[0011] As a further improvement of the present application, the first connecting ring is provided with an outer ring horizontally outwardly extending beyond the outer circumferential surface of the second connecting ring and an inner ring horizontally inwardly extending beyond the inner circumferential surface of the second connecting ring, and the outer ring and the inner ring are both annularly spaced and provided with a plurality of eyelets, and the suturing gasket is sewn on the first connecting ring by a plurality of surgical threads passing through the plurality of eyelets.

[0012] As a further improvement of the present application, the apex suturing assembly further comprises a sealing ring, and the sealing ring is mounted in the second connecting ring and clamped and fixed by the clamp body cooperating with the inner ring.

[0013] As a further improvement of the present application, the suturing gasket and the sealing ring are both made of elastic material, and the inner diameters of the suturing gasket and the sealing ring are both smaller than the inner diameter of the inner ring, and the suturing gasket and the sealing ring can be interference-fitted with the inlet pipe of the blood pump.

[0014] As a further improvement of the present application, the clamping hoop has elastic deformation ability, and in a free state, the inner diameter of the clamping hoop is larger than the outer diameter of the inlet pipe of the blood pump, and the two connecting lugs are respectively adhered to the two ends of the second connecting ring by the elastic force of the clamping hoop.

[0015] As a further improvement of the present application, a plurality of length indicators are arranged on the inlet pipe of the blood pump in an axial direction.

[0016] The present application has the following beneficial effects:

[0017] 1. The present application provides a blood pump fixing position adjustable ventricular connecting device, which comprises a clamping ring, a second connecting ring and a connecting block, the second connecting ring is provided with an opening, a clamping hoop is installed in the second connecting ring, the clamping hoop is provided with two connecting lugs which extend outward from the opening of the second connecting ring, the two connecting lugs are connected to the connecting block by a fastener, and the inner diameter of the clamping hoop is adjusted by rotating the fastener, so that the clamping hoop tightly holds or releases the inlet pipe of the blood pump, thereby the fixing position of the ventricular connecting device on the inlet pipe can be adjusted according to the needs of the patient, the optimal depth of the inlet pipe inserted into the ventricle is controlled, and the success rate and effect of the heart failure treatment surgery are improved.

[0018] 2. The clamping hoop of the present application is matched with the positioning hole on the second connecting ring through the positioning pin thereon, and the two connecting lugs of the clamping hoop are connected to the connecting block by the fastener to realize reliable connection with the clamping ring, the assembly process does not need welding, sterile operation is easy to realize, production difficulty is reduced, and production cost is saved.

[0019] 3. The present application further installs a sealing ring in the clamping ring, the sealing ring is pressed on the inner ring of the first connecting ring by the clamping hoop, the grommet and the sealing ring are matched with the inlet pipe of the blood pump through suturing, double sealing effect is realized, bleeding of the heart apex is prevented, double insurance effect is achieved, and the safety of the surgery is improved.

[0020] 4. The present application has the technical scheme of few parts, small volume, light weight, easy processing, simple and efficient production and assembly, reduced invasiveness of the implant, and reduced implant risk. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 FIG. 1 is a perspective view of the blood pump fixing position adjustable ventricular connecting device of the present application installed on a blood pump;

[0022] Figure 2 FIG. 2 is a perspective view of the blood pump fixing position adjustable ventricular connecting device of the present application;

[0023] Figure 3Another perspective view of the fixed position adjustable ventricular connecting device of the blood pump;

[0024] Figure 4 An exploded view of the fixed position adjustable ventricular connecting device of the blood pump;

[0025] Figure 5 A perspective view of the snap ring in the application;

[0026] Figure 6 A perspective view of the clamp in the application.

[0027] The following description is made in conjunction with the accompanying drawings:

[0028] 1, suture washer; 2, snap ring; 201, first connecting ring; 2011, outer ring;

[0029] 2012, inner ring; 2013, eyelet; 202, second connecting ring; 203, connecting block;

[0030] 2031, first through hole; 204, positioning hole; 3, clamp; 301, clamp body; 302, connecting lug; 3021, second through hole; 3022, threaded hole; 303, positioning pin; 4, fastener; 5, sealing ring; 6, inlet pipe; 601, mark. DETAILED DESCRIPTION

[0031] The following describes a preferred embodiment of the application in conjunction with the accompanying drawings.

[0032] Referring to Figures 1 to 6 The application provides a fixed position adjustable ventricular connecting device of a blood pump, comprising a heart apex suture assembly for suturing on the heart apex and an adjustable connecting assembly for connecting the heart apex suture assembly and the blood pump.

[0033] The heart apex suture assembly comprises a suture washer 1 and a snap ring 2, and the snap ring 2 is provided with a first connecting ring 201, a second connecting ring 202 and a connecting block 203. The first connecting ring 201 is a sheet-shaped circular ring arranged horizontally, with small thickness and large ring width, and a plurality of eyelets 2013 are arranged on the ring in equal intervals, and the suture washer 1 is sutured on the first connecting ring 201 through the plurality of eyelets 2013 using surgical thread. In addition, during the implantation of the blood pump, the suture washer 1 also needs to be sutured on the heart apex using surgical thread through the plurality of eyelets 2013.

[0034] The suture washer 1 in the application is made of elastic material, including but not limited to polyester fabric material, and the inner diameter of the suture washer 1 is smaller than the inner diameter of the first connecting ring 201. When the inlet pipe 6 of the blood pump passes through the inside of the ventricular connecting device, the suture washer 1 can be in interference fit with the inlet pipe 6 of the blood pump, so that the inner circle of the suture washer 1 is tightly fitted on the outer wall of the inlet pipe 6, thereby preventing the heart apex from leaking blood.

[0035] Further, the second connecting ring 202 is a thick and small-width columnar ring, and has an opening.

[0036] Referring to Figures 2 to 4 The adjustable connecting assembly comprises a clamp 3 and a fastener 4. The clamp 3 is provided with a clamp body 301 and two connecting lugs 302. The clamp body 301 is annular and also has an opening. The two connecting lugs 302 are integrally connected to the opening of the clamp body 301 and are oppositely spaced. The clamp body 301 is arranged in the second connecting ring 202, and a positioning pin 303 is arranged on the outer circumferential surface of the clamp body 301 in the radial direction. The second connecting ring 202 is provided with a positioning hole 204 matched with the positioning pin 303 in the radial direction, and the positioning pin 303 is movably arranged in the positioning hole 204. The clamp 3 and the second connecting ring 202 are connected by the cooperation of the positioning pin 303 and the positioning hole 204, so as to ensure the reliable connection of the two, and the structure allows the clamp 3 to be operated to change the inner diameter.

[0037] Further, the two connecting lugs 302 extend outward from the opening of the second connecting ring 202, the fastener 4 connects the two connecting lugs 302 to the connecting block 203, and when the fastener 4 is rotated, the two connecting lugs 302 can be moved closer to or away from each other, so that the inner diameter of the clamp body 301 is contracted or expanded.

[0038] In a free state, i.e. when the fastener 4 is not locked, the inner diameter of the clamp 3 is slightly larger than the outer diameter of the inlet pipe 6 of the blood pump. When the inlet pipe 6 passes through the inside of the ventricular connecting device, the clamp 3 and the inlet pipe 6 are in a small gap fit, and then the fixed position of the clamp 3 on the inlet pipe 6 can be selected as required. After the fixed position of the clamp 3 on the inlet pipe 6 is determined, the two connecting lugs 302 are moved closer to each other by rotating the fastener 4, so as to adjust the inner diameter of the clamp body 301 to be contracted, so that the clamp body 301 is tightly held on the inlet pipe 6, thereby realizing the fixed connection of the ventricular connecting device and the blood pump. By adopting the technical scheme, the fixed position of the blood pump can be adjusted according to the requirements of the patient when the blood pump is implanted in the operation, so as to control the optimal depth of the inlet pipe 6 inserted into the ventricle, so as to achieve the individualization, which is beneficial to improve the success rate and effect of heart failure treatment operation. At the same time, the adjustable connecting assembly has a simple structure, and is convenient to operate when the blood pump is connected and fixed in the operation, and only needs to rotate the fastener 4 to realize the fixation, so as to shorten the implantation time in the operation. In addition, the clamp 3 and the clamp ring 2 are connected by the cooperation of the positioning pin 303 and the positioning hole 204, and the two connecting lugs 302 and the connecting block 203 are connected by the fastener 4, so that the assembly process does not need welding, the sterile operation is easy to realize, the production difficulty is reduced, and the production cost is saved.

[0039] Referring to Figure 3 , Figure 5 and Figure 6 , the clamping hoop 3 is made of titanium alloy material and has a certain elastic deformation capacity. Two connecting lugs 302 of the clamping hoop 3 are arranged on the two sides of the connecting block 203, and in a free state, the clamping hoop 3 relies on its own elastic force to make the two connecting lugs 302 abut on the two ends of the second connecting ring 202 respectively. A first through hole 2031 for the fastener 4 to pass through is formed in the middle of the connecting block 203, a second through hole 3021 opposite to the first through hole 2031 is formed on one of the connecting lugs 302, and a threaded hole 3022 opposite to the first through hole 2031 is formed on the other connecting lug 302. The fastener 4 in the present application is a screw, which is screwed into the threaded hole 3022 after passing through the second through hole 3021 and the first through hole 2031 in sequence, and the inner diameter of the clamping hoop 3 can be adjusted by rotating the screw.

[0040] Referring to Figure 3 and Figure 6 , the outer periphery of the clamping body 301 is provided with a pad, and in a free state, the outer side of the pad abuts on the inner periphery of the second connecting ring 202 to limit the position, and the positioning pin 303 is on the pad.

[0041] In the present embodiment, the outer periphery of the clamping body 301 is provided with but not limited to two pads and two positioning pins 303, and correspondingly, the second connecting ring 202 is provided with two positioning holes 204 for one-to-one insertion of the two positioning pins 303. The clamping body 301 can be roughly divided into three equal parts with the positions of the two positioning pins 303 and the positions of the openings as the boundaries. The configuration of the positions of the two positioning pins 303 not only ensures that the connection between the clamping hoop 3 and the clasp 2 is more reliable, but also the lengths of the positioning pins 303 inserted into the positioning holes 204 can change when the inner diameter of the clamping body 301 is adjusted, without affecting the adjustment of the clamping hoop 3.

[0042] Referring to Figure 5 , the first connecting ring 201 is provided with an outer ring 2011 horizontally extending outward beyond the outer periphery of the second connecting ring 202 and an inner ring 2012 horizontally extending inward beyond the inner periphery of the second connecting ring 202. The outer ring 2011 and the inner ring 2012 are both annularly and equally spaced to have a plurality of eyelets 2013, and the surgical line is used to sew the suture gasket 1 on the first connecting ring 201 through the plurality of eyelets 2013. The suture gasket 1 is sewn through the eyelets 2013 on the outer ring 2011 and the inner ring 2012, which is more reliable in fixed connection of the suture gasket 1 and can prevent the problem that the inner ring of the suture gasket 1 is buckled when the inlet pipe 6 is inserted, resulting in unreliable sealing.

[0043] Referring to Figure 2 , Figure 4 and Figure 5As another important improvement of the application, the apex suturing assembly further comprises a sealing ring 5 installed in the second connecting ring 202 and abutting against the bottom of the inner ring 2012, and the sealing ring 5 is clamped and fixed by the hoop body 301 cooperating with the inner ring 2012. The sealing ring 5 is made of elastic material, including but not limited to polyester fabric or felt fabric, and the inner diameter of the sealing ring 5 is smaller than the inner diameter of the inner ring 2012, and the sealing ring 5 can be in interference fit with the inlet pipe 6 of the blood pump, so that the inner circle of the sealing ring 5 is tightly attached to the outer wall of the inlet pipe 6, thereby further preventing blood leakage from the heart apex. The application adopts the suturing washer 1 and the sealing ring 5 to cooperate with the inlet pipe 6 of the blood pump, realizes double sealing effect, prevents blood leakage from the heart apex, plays a double insurance role, and improves the safety of the operation.

[0044] In addition, as shown in Figure 1 , the application is arranged on the outer wall of the inlet pipe 6 in the axial direction and is arranged in multiple rows of length indicating marks 601, so as to facilitate the confirmation of the fixed position of the ventricular connecting device on the inlet pipe 6.

[0045] The specific steps of implanting the blood pump using the ventricular connecting device of the application are as follows:

[0046] S1, according to the myocardial thickness of the heart apex of the patient detected, the optimal depth of the inlet pipe 6 of the blood pump inserted into the ventricle of the patient is determined, that is, the fixed position of the ventricular connecting device on the inlet pipe 6 is determined corresponding to the mark 601;

[0047] S2, the ventricular connecting device assembled as a whole as shown in Figure 2 is sutured on the heart apex of the patient; specifically, the suturing washer 1 is attached to the heart apex, and the heart apex is sutured by the surgical thread from the hole eye 2013 on the first connecting ring 201 through the suturing washer 1;

[0048] S3, using the apex punch to punch a hole on the heart apex from the inside of the ventricular connecting device;

[0049] S4, the inlet pipe 6 of the blood pump is inserted into the ventricle from the inside of the ventricular connecting device until the optimal depth is reached, at which time the ventricular connecting device is at the fixed position determined on the inlet pipe 6;

[0050] S5, the fastener 4 is twisted to make the inner diameter of the clamp 3 shrink to tightly hold the inlet pipe 6, and the installation is completed.

[0051] It can be seen that the blood pump fixed position adjustable ventricular connecting device has the advantages that the second connecting ring 202 with an opening is arranged on the clasp 2, the clasp 3 is mounted in the second connecting ring 202, the clasp 3 is provided with two connecting lugs 302 extending outward from the opening of the second connecting ring 202, the two connecting lugs 302 are connected to the connecting block 203 through the fastener 4, the inner diameter of the clasp body 301 is adjusted by rotating the fastener 4, the clasp 3 tightly holds or releases the inlet pipe 6 of the blood pump, the fixed position of the ventricular connecting device on the inlet pipe 6 can be adjusted according to the needs of the patient, the optimal depth of the inlet pipe 6 inserted into the ventricle is controlled, the success rate and effect of the heart failure treatment surgery are improved, the structure is simple, the blood pump is connected and fixed during the surgery, the operation is facilitated, the fastener 4 is only needed to be rotated to realize the fixation, the surgery implantation time is shortened, the clasp 3 is combined with the positioning hole 204 on the second connecting ring through the positioning pin 303 thereon, the two connecting lugs 302 of the clasp are connected to the connecting block 203 through the fastener 4 to realize the reliable connection with the clasp 2, the assembly process does not need welding, the sterile operation is easily realized, the production difficulty is reduced, and the production cost is saved, the sealing ring 5 is mounted in the clasp, the sealing ring 5 is pressed on the inner ring 2012 of the first connecting ring 201 by the clasp 3, the double sealing effect is realized through the cooperation of the grommet 1, the sealing ring 5 and the inlet pipe 6 of the blood pump, the heart apex blood leakage is prevented, the double insurance effect is achieved, and the surgery safety is improved, the technical scheme is adopted, parts are few, the volume is small, the weight is light, the processing is facilitated, the production and assembly are simple and efficient, the invasiveness of the implant is reduced, and the implantation risk is reduced.

[0052] In the above description, many specific details are set forth in order to provide a thorough understanding of the present application. However, the above description is merely a preferred embodiment of the present application, and the present application can be carried out in many different ways than those described above, and therefore the present application is not limited by the specific implementations disclosed above. Meanwhile, any person skilled in the art can make many possible changes and modifications to the technical solutions disclosed above, or modify equivalent embodiments, without departing from the scope of the technical solutions of the present application. Any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application, without departing from the technical solutions of the present application, still belongs to the protection scope of the technical solutions of the present application.

Claims

1. A blood pump fixed position adjustable ventricular connection device, characterized by, The application relates to a heart apex suture assembly for suturing on a heart apex, which comprises a suture washer (1) and a snap ring (2), wherein the snap ring (2) is provided with a first connecting ring (201), a second connecting ring (202) integrally connected to one side of the first connecting ring (201) and provided with an opening, and a connecting block (203) arranged at the opening of the second connecting ring (202), and the suture washer (1) is fixedly connected to the other side of the first connecting ring (201). The application further relates to an adjustable connecting assembly for connecting the heart apex suture assembly and a blood pump, which comprises a clamp (3) and a fastener (4), wherein the clamp (3) is provided with a clamp body (301) in the shape of a ring and provided with an opening, and two connecting lugs (302) spaced apart and arranged at the two ends of the clamp body (301), the clamp body (301) is arranged in the second connecting ring (202), the clamp body (301) is provided with a positioning pin (303) which is movably arranged in a positioning hole (204) arranged in the second connecting ring (202) in the radial direction, the two connecting lugs (302) are arranged to extend outward from the opening of the second connecting ring (202), the fastener (4) is arranged to connect the two connecting lugs (302) to the connecting block (203), and when the fastener (4) is rotated, the two connecting lugs (302) can be moved closer to or farther away from each other, so that the inner diameter of the clamp body (301) is contracted or expanded. The connecting block (203) is integrally connected to one side of the first connecting ring (201), and a first through hole (2031) is arranged in the middle of the connecting block (203) and used for allowing the fastener (4) to pass through.

2. The blood pump fixed position adjustable ventricular connection device of claim 1, wherein: The two connecting lugs (302) are arranged on the two sides of the connecting block (203) respectively, a second through hole (3021) is arranged in one of the connecting lugs (302) and opposite to the first through hole (2031), and a threaded hole (3022) is arranged in the other connecting lug (302) and opposite to the first through hole (2031); the fastener (4) is a screw which is arranged to pass through the second through hole (3021) and the first through hole (2031) in sequence and then threadedly connected to the threaded hole (3022).

3. The blood pump fixed position adjustable ventricular connection device of claim 2, wherein: A plurality of positioning pins (303) are arranged on the outer circumferential surface of the clamp body (301) in the radial direction, the second connecting ring (202) is provided with a plurality of positioning holes (204) for one-to-one corresponding insertion of the plurality of positioning pins (303), and the lengths of the positioning pins (303) inserted into the positioning holes (204) can be changed when the inner diameter of the clamp body (301) is adjusted.

4. The blood pump fixed position adjustable ventricular connection device of claim 1, wherein: ​ 5. The blood pump fixed position adjustable ventricular connection device of claim 1, wherein: The first connecting ring (201) is provided with an outer ring (2011) horizontally extending outwardly beyond the outer periphery of the second connecting ring (202) and an inner ring (2012) horizontally extending inwardly beyond the inner periphery of the second connecting ring (202), the outer ring (2011) and the inner ring (2012) are both annularly spaced apart and provided with a plurality of eyelets (2013), the suture grommet (1) is sutured on the first connecting ring (201) by surgical thread through the plurality of eyelets (2013).

6. The blood pump fixed position adjustable ventricular connection device of claim 5, wherein: The heart apex suture assembly further comprises a sealing ring (5) mounted in the second connecting ring (202) and clamped and fixed by the hoop body (301) cooperating with the inner ring (2012).

7. The blood pump fixed position adjustable ventricular connection device of claim 6, wherein: The suture grommet (1) and the sealing ring (5) are both made of elastic material, each of the inner diameters of the suture grommet (1) and the sealing ring (5) is smaller than the inner diameter of the inner ring (2012), and the suture grommet (1) and the sealing ring (5) can be in interference fit with the inlet pipe (6) of the blood pump.

8. The blood pump fixed position adjustable ventricular connection device of claim 1, wherein: The clamp (3) has elastic deformation capability, in a free state, the inner diameter of the clamp (3) is greater than the outer diameter of the inlet pipe (6) of the blood pump, and the two connecting lugs (302) are respectively attached to the two ends of the second connecting ring (202) by relying on the elastic force of the clamp (3).

9. The fixed position adjustable ventricular attachment device of claim 1, wherein: A plurality of length indicators (601) are arranged on the inlet pipe (6) of the blood pump in an axial direction.

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