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Information on Product and Application for ERBE CRYO 6 In collaboration with Dr. Schüder and Dr. Pistorius, Univ. Homburg ERBE.

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Presentation on theme: "Information on Product and Application for ERBE CRYO 6 In collaboration with Dr. Schüder and Dr. Pistorius, Univ. Homburg ERBE."— Presentation transcript:

1 Information on Product and Application for ERBE CRYO 6 In collaboration with Dr. Schüder and Dr. Pistorius, Univ. Homburg ERBE

2 1. Cryosurgery Cryosurgery is an addition to existing surgical methods for the treatment of hepatic metastases. Cryosurgery is the term used to describe tissue destruction (devitalization) using extreme cold. During this process intracellular ice is formed leading to cell necrosis. ERBE

3 1. Cryosurgery In modern cryosurgery 4 coolants are employed: Nitrous oxide (N 2 O)min. temperature - 80 °C Liquid nitrogen (LN 2 )min. temperature °C Carbon dioxide (CO 2 )min. temperature - 60 °C Argonmin. temperature °C N 2 O and CO 2 units are not suitable for the cryosurgical treatment of malignant tumors. ERBE

4 1. Cryosurgery The following parameters are of particular importance for successful cryosurgery: extreme cooling of the tumor cells (at least - 50°C) a freezing temperature of at least - 100°C / min. in order to freeze large metastases or tumors simultaneously, several cryoprobes can be inserted concurrently. ERBE

5 1. Cryosurgery Compared to the beginnings of cryosurgery approx. 25 years ago the following has changed: Improved knowledge of cryobiology (ice  cell necrosis, freezing times, freezing speed and freezing cycles) Improved cryounits (rapid freezing speed, constant power output, simultaneous insertion of several probes possible) Improved cryoprobes (thin, high-powered) Improved application methods (intra-op.-ultrasound, positioning sets) ERBE

6 1. Cryosurgery Improvements in cryo-technology together with the intra-operative use of ultrasound have made the reliable destruction of hepatic metastases accompanied by only minimal complications possible. The advantages of cryosurgery in the treatment of hepatic metastases are: Treatment option for irresectable metastases of the liver Combined OP (resection and cryosurgery) Freezing of the edges of the resected area (to increase the safety margin) Treatment method with minimal complications Limited range of application means that healthy liver parenchyma is not affected ERBE

7 1. Cryosurgery ERBE

8 Germany U.K. Netherlands Japan Italy France Spain U.S.A. Male40,9 Female52,2 Male51,7 Female51,3 Male43,4 Female44,6 Male47,4 Female36,9 Male64,8 Female58,5 Male51,0 Female41,5 Male34,4 Female30,2 Male57,9 Female40,0 Colorectal Cancer Worldwide incidence* *Incidence are per population. International Opportunities in Cancer Management - SRI International ERBE

9 2. Liver metastases through colon carcinoma In the Federal Republic of Germany there are an average of approx new cases of colon carcinoma per year. Of these patients, approx develop synchronous and approx develop metachronous liver metastases per year ERBE

10 2. Liver metastases through colon carcinoma Cancer of the colon and the rectum Germany 1991 Men Women total New cases Synchron. liver metastases (estimated) approx. 15 % Metachron. liver metastases (estimated) approx. 15 % New cases of liver metastases per year ERBE

11 2. Liver metastases through colon carcinoma Hematogenous metastasis develops primarily in the liver and secondarily in the lungs. All in all, of the new cases of liver metastases, approx. 10% = can be treated with cryotherapy. ERBE

12 2. Liver metastases through colonic carcinoma Summary new cases of liver metastasis per year % resectable = % irresectable despite only few metastases % treatable by cryotherapy = ERBE

13 Distribution of liver metastases according to type (Study carried out at the Univ. Homburg/Saar n = 162 Pt.) ERBE

14 2. Liver metastases through colonic carcinoma Prognostic factors for the resection of colorectal liver metastases: Number of metastases (3 - 10) Tumor-free margin Lymph-node status of the primary tumor Interval of time between primary operation and the occurrence of metastases The combination of cryotherapy and resection offers patients with an unfavorable distribution of metastases a therapeutic option. ERBE

15 3. Equipment/Instruments For successful cryosurgical therapy of liver metastases and liver tumors the following preconditions are of particular importance: A good high-resolution U/S - unit (preferably with a good radiologist) A high-powered cryounit with a connection for multiple probes A temperature measurement gauge to monitor tissue temperatures using temperature-measuring needles sterile dilatator sets for the introduction and positioning of cryoprobes ERBE

16 3. Equipment/Instruments ERBE

17 3. Equipment/Instruments Two newly developed cryo contact applicators are available for the ERBE Cryo 6: Paddle applicator, 50mm Ø, Art.-No.: Flat applicator, 50mm Ø, Art.-No.: These cryo contact applicators are particularly suitable after the resection of liver tumors. Either the flat or the paddle applicator can be utilized depending on the localization of the resected area. Use of these special cryo contact applicators increases the size of the safety margin after resection. ERBE

18 3. Equipment/Instruments Formation of ball of ice using flat applicator ERBE

19 3. Equipment/Instruments ERBE

20 3. Equipment/Instruments ERBE

21 3. Equipment/Instruments Important requirements for the exact staging of tumors : A good U/S - unit with high resolution U/S - transducer: - for open liver procedures 5 MHz or possibly 7.5 MHz - percutaneously 3.5 MHz ERBE

22 3. Equipment/Instruments Intra-operative sonography offers the following advantages: exact identification of metastases precise positioning of the cryoprobes Monitoring of ice formation. ERBE

23 4. Operative technique The same conditions which apply to resection also apply to indications for cryosurgery, i.e. extra-hepatic metastases (exception: the lungs) must be precluded, basically a remedial approach. ERBE

24 4. Operative technique a. Positioning of the cryoprobes with the help of a U/S - unit and dilatator sets: ERBE CRYO 6 offers the possibility of utilizing up to 6 cryoprobes concurrently. Prior to the positioning of cryoprobes in the metastases, the size of the metastases must be ascertained using U/S, in order to determine the number of cryoprobes required. The following system should be applied: ERBE

25 4. Operative technique Metastases with a  up to: 1.5 cm1 cryoprobe 2.5 cm2 cryoprobes 3.5 cm3 cryoprobes 5 cm4 cryoprobes 6 cm5 cryoprobes >7 cm6 cryoprobes ERBE

26 4. Operative technique To begin with, the needle together with a guiding channel is precisely positioned in the metastasis under U/S - monitoring. The needle is then removed from the channel. A guide-wire is then introduced through the channel using the Seldinger technique. The guide-wire is provided with a J - hook at one end, which can be clearly visualized under U/S - control. The J - hook must be positioned exactly at the distal end of the channel. The channel is then removed. A synthetic cone with the dilatator is introduced into the hepatic metastasis with the help of the guide-wire. ERBE

27 4. Operative technique Cone and dilatator must be inserted up to the hook at the end of the guide-wire. The guide-wire and the cone are then removed from the dilatator. Once the cryoprobe has been completely inserted into the dilatator up to the very end, the dilatator is then partially retracted in order to ensure that the freezing zone of the cryoprobe lies outside of the dilatator and is correctly positioned. Note! Dilatator sets should only be used once! ERBE

28 4. Operative technique One dilatator set per cryoprobe is required. If the patient presents with several metastases, then the same dilatator set can be reused several times. After positioning the cryoprobes, the freezing cycle is activated. Note! The cryoprobes are only firmly positioned in the liver when the necessary freezing temperature has been reached. During freezing the cryoprobes should be held still in order to avoid creating tension between the probes (danger of cracking). ERBE

29 4. Operative technique.. ERBE

30 4. Operative technique If the metastases are larger than 5 cm , then the cryoprobes must be withdrawn after the first cryo-cycle in order to freeze the entire metastasis during a second cryo-cycle. After one freezing cycle (15 min at -195°C) and a period on hold ( min at -150°C) the freezing process is halted for every cryoprobe. If the ice extends up to the surface, then the heating system is only activated after reaching a temperature of approx. -20 °C to -30 °C, because of the danger of cracking. ERBE

31 4. Operative technique Once the cryoprobe has achieved a temperature above zero, then the surgeon can carefully begin to detach the probe form the ball of ice. If the ice has formed within the liver, then the heating system can be activated immediately. After the cryoprobe has been detached from the ball of ice, the heating system can be deactivated. ERBE

32 4. Operative technique b. Utilization of thermo-measuring needles ERBE CRYO 6 offers the possibility of utilizing up to 6 thermo-measuring needles concurrently. With the help of the thermo-measuring needles, it is possible to measure the temperature in various tissue areas or in the vicinity of a particular vasculature or organ. In order to ascertain whether the required freezing temperature of - 50°C has been achieved at the periphery of the metastasis, a thermo-measuring needle should be positioned within the area in question with the help of U/S monitoring. ERBE

33 4. Operative technique If the cryoprobe has been properly positioned, the temperature after 15 min. should be - 50 °C. Thermo-measuring needles are available in various different sizes, optimized for open and percutaneous operations. ERBE

34 5. Temperature distribution in liver tissue In order to completely achieve the required temperature of - 50 °C in metastases and tumors of different shapes and sizes, it will be necessary in most cases to utilize more than one cryoprobe. When only one cryoprobe is used, the isotherm of - 50 °C will have a diameter of 22 mm after a freezing time of 15 min. The entire ball of ice will be approx. 45 mm . This means that the outer margin of the iceball of 1 cm will not be sufficient for cell necrosis. It will be therefore necessary to freeze an area of at least 1 cm over and above the actual tumor margin. This can easily be monitored sonographically. ERBE

35 5. Temperature distribution in liver tissue When treating tumors larger than 20 mm , more than one cryoprobe must be utilized (s. Fig. 11). Fig. 12 clearly shows that with the synergistic use of three concurrent cryoprobes it is possible to achieve an extremely high isotherm of - 50 °C. Fig. 11 Fig. 12 ERBE

36 5. Temperature distribution in liver tissue If the tumor is not circular in shape, as shown in Fig. 13, then an additional cryoprobe must be inserted. Fig. 13 ERBE

37 5. Temperature distribution in liver tissue As early as 1985, Gage established the fact that rate of necrosis is related to tissue temperature. Rate of necrosis correlated with tissue temperature (Gage et al. 1985) Temperature °C Rate of necrosis (%) -15 to to to ERBE

38 6. Operation time Cryotherapy: Operation time Average: 230 minutes ( ) Example: Ultrasound 10‘ Positioning of the probes 30‘ freezing cycles 60‘ Defrosting stage 25‘ ‘ ERBE

39 7. Percutaneous cryosurgery of hepatic tumors Percutaneous cryosurgery is well suited for patients with hepatic tumors which can be easily localized sono- graphically. Tumor-staging is carried out using an U/S - transducer 3.5 MHz. The sterile dilatator set is particularly suitable for the percutaneous positioning of cryoprobes. ERBE

40 7. Percutaneous cryosurgery of hepatic tumors.. ERBE

41 7. Percutaneous cryosurgery of hepatic tumors Advantages of percutaneous cryosurgery are: no loss of blood during the operation no intra- or postoperative complications short period of hospitalization of about days additional percutaneous cryo -operations always possible Disadvantage: Control of therapeutic results is problematic, particularly in tumor regions adjacent to the ultrasound ERBE

42 8. Cases The following OPs were carried out at the University Clinic of Homburg from 8/1995 to 8/1998: Patients100 Resection + Cryo37 Cryo 48 Percutan.15 Metastases total249 - Cryo147 - Resection 80 - Freezing of resection margins using paddle applicator 3 x ERBE

43 8. Cases No. of metastases per patient Average size3.4  2.2 cm No. of cryoprobes per patient - open percutan.4 Average rate of survival48 months ERBE

44 9. Alternative therapies for irresectable hepatic metastases and liver tumors 1. Chemotherapy 2. Ethanol injection 3. Laser-induced thermotherapy 4. Electrotherapy 5. Genetic therapy ERBE

45 9. Alternative therapies for irresectable hepatic metastases and liver tumors 1. Local chemotherapy Hepatocellular carcinomas (HCC) do not respond well to systemic chemotherapy. Nor have the benefits of a local arterial chemotherapy or chemo-embolisation been clearly demonstrated. The median rate of survival with irresectable HCC is between 4 -6 months. ERBE

46 9. Alternative therapies for irresectable hepatic metastases and liver tumors 2. Ethanol injection (Only for HCC) For ethanol injection ml 100% alcohol is injected using a 22 - gauge needle which is positioned in the tumor under local anesthesia under ultrasound monitoring. This creates a diffuse necrosis in and around the tumor. The injection can be administered twice a week. This form of therapy is not successful for single tumors with a diameter of more than 5 cm or for advanced cirrhosis of the liver. More than half of the patients develop a fever after receiving therapy. ERBE

47 9. Alternative therapies for irresectable hepatic metastases and liver tumors 3. Laser-induced thermotherapy (LITT) Laser-induced thermotherapy (LITT) is a minimally invasive method of treatment for the local destruction of solid tumors and metastases in the liver, brain, breast and in ENT - therapeutics. This technique was first carried out in 1983 using a Nd:YAG - laser. Low-powered laser light ( watt) is applied directly into the inner area of the tumor using thin optical fibers and leads to a coagulation necrosis. ERBE

48 9. Alternative therapies for irresectable hepatic metastases and liver tumors Positioning of the fibers is carried out under CT - control. For the laser application, the patient must be removed to the MRT - measuring room. A metastasis measuring up to 2 cm can be treated with a laser applicator. One treatment session takes between minutes. As it is only possible to insert one applicator, larger metastases must be treated over a period of several sessions which is extremely time-consuming. ERBE

49 9. Alternative therapies for irresectable hepatic metastases and liver tumors 4. Electrotherapy During electrotherapy (HF) thin isolated electrodes are positioned in the metastases under ultrasound monitoring. Additional needles are then extended in an umbrella-like fashion into the metastasis. The ion flow which is generated locally produces heat. The temperatures of over 70°C lead to coagulation necroses. Using one electrode metastases of up to 2 cm in size can be treated. One treatment session takes between minutes. Only one electrode can be used during treatment. ERBE

50 9. Alternative therapies for irresectable hepatic metastases and liver tumors 5. Genetic therapy During genetic therapy, genetic material is inserted into the cells of the body. The basic requirement for genetic therapy is the identification of defects in the course of transcription and translation. Suitable vectors are required for the introduction of genetic material into normal or abnormal tissue. In a pilot study, 5 patients with HCC were treated by sonographically controlled percutaneous injection of p53-DNA into the tumoral nodes. 3 patients showed a tumor reduction as demonstrated by CT control. ERBE

51 10. Competitors Comparison Cryo-Systems

52 CMS LN 2 System Endocare Argon System Spembly LN 2 System ERBE LN 2 System ERBE


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